docs/gst/html/GstElement.html - mtk-gstreamer-debian - Git at Google

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>GstElement: GStreamer 1.0 Core Reference Manual</title>
 <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
 <link rel="home" href="index.html" title="GStreamer 1.0 Core Reference Manual">
 <link rel="up" href="libgstreamer.html" title="GStreamer Core Library">
 <link rel="prev" href="GstDateTime.html" title="GstDateTime">
 <link rel="next" href="GstElementFactory.html" title="GstElementFactory">
 <meta name="generator" content="GTK-Doc V1.25 (XML mode)">
 <link rel="stylesheet" href="style.css" type="text/css">
 </head>
 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
 <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
 <td width="100%" align="left" class="shortcuts">
 <a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span>
                   <a href="#GstElement.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span>
                   <a href="#GstElement.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_derived_interfaces">  <span class="dim">|</span>
                   <a href="#GstElement.derived-interfaces" class="shortcut">Known Derived Interfaces</a></span><span id="nav_signals">  <span class="dim">|</span>
                   <a href="#GstElement.signals" class="shortcut">Signals</a></span>
 </td>
 <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
 <td><a accesskey="u" href="libgstreamer.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
 <td><a accesskey="p" href="GstDateTime.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
 <td><a accesskey="n" href="GstElementFactory.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
 </tr></table>
 <div class="refentry">
 <a name="GstElement"></a><div class="titlepage"></div>
 <div class="refnamediv"><table width="100%"><tr>
 <td valign="top">
 <h2><span class="refentrytitle"><a name="GstElement.top_of_page"></a>GstElement</span></h2>
 <p>GstElement — Abstract base class for all pipeline elements</p>
 </td>
 <td class="gallery_image" valign="top" align="right"></td>
 </tr></table></div>
 <div class="refsect1">
 <a name="GstElement.functions"></a><h2>Functions</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="functions_return">
 <col class="functions_name">
 </colgroup>
 <tbody>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE:CAPS" title="GST_STATE()">GST_STATE</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-GET-NEXT:CAPS" title="GST_STATE_GET_NEXT()">GST_STATE_GET_NEXT</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-NEXT:CAPS" title="GST_STATE_NEXT()">GST_STATE_NEXT</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-PENDING:CAPS" title="GST_STATE_PENDING()">GST_STATE_PENDING</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-RETURN:CAPS" title="GST_STATE_RETURN()">GST_STATE_RETURN</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-TARGET:CAPS" title="GST_STATE_TARGET()">GST_STATE_TARGET</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-TRANSITION:CAPS" title="GST_STATE_TRANSITION()">GST_STATE_TRANSITION</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-TRANSITION-CURRENT:CAPS" title="GST_STATE_TRANSITION_CURRENT()">GST_STATE_TRANSITION_CURRENT</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-TRANSITION-NEXT:CAPS" title="GST_STATE_TRANSITION_NEXT()">GST_STATE_TRANSITION_NEXT</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-GET-LOCK:CAPS" title="GST_STATE_GET_LOCK()">GST_STATE_GET_LOCK</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-STATE-GET-COND:CAPS" title="GST_STATE_GET_COND()">GST_STATE_GET_COND</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-NAME:CAPS" title="GST_ELEMENT_NAME()">GST_ELEMENT_NAME</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-PARENT:CAPS" title="GST_ELEMENT_PARENT()">GST_ELEMENT_PARENT</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-BUS:CAPS" title="GST_ELEMENT_BUS()">GST_ELEMENT_BUS</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-CLOCK:CAPS" title="GST_ELEMENT_CLOCK()">GST_ELEMENT_CLOCK</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-PADS:CAPS" title="GST_ELEMENT_PADS()">GST_ELEMENT_PADS</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-START-TIME:CAPS" title="GST_ELEMENT_START_TIME()">GST_ELEMENT_START_TIME</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-ERROR:CAPS" title="GST_ELEMENT_ERROR()">GST_ELEMENT_ERROR</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-ERROR-WITH-DETAILS:CAPS" title="GST_ELEMENT_ERROR_WITH_DETAILS()">GST_ELEMENT_ERROR_WITH_DETAILS</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-FLOW-ERROR:CAPS" title="GST_ELEMENT_FLOW_ERROR()">GST_ELEMENT_FLOW_ERROR</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-WARNING:CAPS" title="GST_ELEMENT_WARNING()">GST_ELEMENT_WARNING</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-WARNING-WITH-DETAILS:CAPS" title="GST_ELEMENT_WARNING_WITH_DETAILS()">GST_ELEMENT_WARNING_WITH_DETAILS</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-INFO:CAPS" title="GST_ELEMENT_INFO()">GST_ELEMENT_INFO</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-INFO-WITH-DETAILS:CAPS" title="GST_ELEMENT_INFO_WITH_DETAILS()">GST_ELEMENT_INFO_WITH_DETAILS</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#GST-ELEMENT-IS-LOCKED-STATE:CAPS" title="GST_ELEMENT_IS_LOCKED_STATE()">GST_ELEMENT_IS_LOCKED_STATE</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-add-pad-template" title="gst_element_class_add_pad_template ()">gst_element_class_add_pad_template</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-add-static-pad-template" title="gst_element_class_add_static_pad_template ()">gst_element_class_add_static_pad_template</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-get-pad-template" title="gst_element_class_get_pad_template ()">gst_element_class_get_pad_template</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-get-pad-template-list" title="gst_element_class_get_pad_template_list ()">gst_element_class_get_pad_template_list</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-set-metadata" title="gst_element_class_set_metadata ()">gst_element_class_set_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-set-static-metadata" title="gst_element_class_set_static_metadata ()">gst_element_class_set_static_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-add-metadata" title="gst_element_class_add_metadata ()">gst_element_class_add_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-add-static-metadata" title="gst_element_class_add_static_metadata ()">gst_element_class_add_static_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-add-pad" title="gst_element_add_pad ()">gst_element_add_pad</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-create-all-pads" title="gst_element_create_all_pads ()">gst_element_create_all_pads</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-compatible-pad" title="gst_element_get_compatible_pad ()">gst_element_get_compatible_pad</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-compatible-pad-template" title="gst_element_get_compatible_pad_template ()">gst_element_get_compatible_pad_template</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-request-pad" title="gst_element_get_request_pad ()">gst_element_get_request_pad</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-static-pad" title="gst_element_get_static_pad ()">gst_element_get_static_pad</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()">gst_element_request_pad</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-no-more-pads" title="gst_element_no_more_pads ()">gst_element_no_more_pads</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()">gst_element_release_request_pad</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-remove-pad" title="gst_element_remove_pad ()">gst_element_remove_pad</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-iterate-pads" title="gst_element_iterate_pads ()">gst_element_iterate_pads</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-iterate-sink-pads" title="gst_element_iterate_sink_pads ()">gst_element_iterate_sink_pads</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-iterate-src-pads" title="gst_element_iterate_src_pads ()">gst_element_iterate_src_pads</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-link" title="gst_element_link ()">gst_element_link</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-unlink" title="gst_element_unlink ()">gst_element_unlink</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-link-many" title="gst_element_link_many ()">gst_element_link_many</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-unlink-many" title="gst_element_unlink_many ()">gst_element_unlink_many</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-link-pads" title="gst_element_link_pads ()">gst_element_link_pads</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-link-pads-full" title="gst_element_link_pads_full ()">gst_element_link_pads_full</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-unlink-pads" title="gst_element_unlink_pads ()">gst_element_unlink_pads</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-link-pads-filtered" title="gst_element_link_pads_filtered ()">gst_element_link_pads_filtered</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-link-filtered" title="gst_element_link_filtered ()">gst_element_link_filtered</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-class-get-metadata" title="gst_element_class_get_metadata ()">gst_element_class_get_metadata</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-base-time" title="gst_element_set_base_time ()">gst_element_set_base_time</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-base-time" title="gst_element_get_base_time ()">gst_element_get_base_time</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-start-time" title="gst_element_set_start_time ()">gst_element_set_start_time</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-start-time" title="gst_element_get_start_time ()">gst_element_get_start_time</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-bus" title="gst_element_set_bus ()">gst_element_set_bus</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstBus.html" title="GstBus"><span class="returnvalue">GstBus</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-bus" title="gst_element_get_bus ()">gst_element_get_bus</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-context" title="gst_element_set_context ()">gst_element_set_context</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstContext.html" title="GstContext"><span class="returnvalue">GstContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-context" title="gst_element_get_context ()">gst_element_get_context</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstContext.html" title="GstContext"><span class="returnvalue">GstContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-context-unlocked" title="gst_element_get_context_unlocked ()">gst_element_get_context_unlocked</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-contexts" title="gst_element_get_contexts ()">gst_element_get_contexts</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="returnvalue">GstElementFactory</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-factory" title="gst_element_get_factory ()">gst_element_get_factory</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-name" title="gst_element_set_name()">gst_element_set_name</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-name" title="gst_element_get_name()">gst_element_get_name</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-parent" title="gst_element_set_parent()">gst_element_set_parent</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-parent" title="gst_element_get_parent()">gst_element_get_parent</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-clock" title="gst_element_set_clock ()">gst_element_set_clock</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-clock" title="gst_element_get_clock ()">gst_element_get_clock</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-provide-clock" title="gst_element_provide_clock ()">gst_element_provide_clock</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()">gst_element_set_state</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()">gst_element_get_state</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-set-locked-state" title="gst_element_set_locked_state ()">gst_element_set_locked_state</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-is-locked-state" title="gst_element_is_locked_state ()">gst_element_is_locked_state</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-abort-state" title="gst_element_abort_state ()">gst_element_abort_state</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-continue-state" title="gst_element_continue_state ()">gst_element_continue_state</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-lost-state" title="gst_element_lost_state ()">gst_element_lost_state</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-state-get-name" title="gst_element_state_get_name ()">gst_element_state_get_name</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-state-change-return-get-name" title="gst_element_state_change_return_get_name ()">gst_element_state_change_return_get_name</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-sync-state-with-parent" title="gst_element_sync_state_with_parent ()">gst_element_sync_state_with_parent</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-change-state" title="gst_element_change_state ()">gst_element_change_state</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-message-full" title="gst_element_message_full ()">gst_element_message_full</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-message-full-with-details" title="gst_element_message_full_with_details ()">gst_element_message_full_with_details</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="GstStructure.html" title="GstStructure"><span class="returnvalue">GstStructure</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-make-element-message-details" title="gst_make_element_message_details ()">gst_make_element_message_details</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-post-message" title="gst_element_post_message ()">gst_element_post_message</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-query" title="gst_element_query ()">gst_element_query</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-query-convert" title="gst_element_query_convert ()">gst_element_query_convert</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-query-position" title="gst_element_query_position ()">gst_element_query_position</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-query-duration" title="gst_element_query_duration ()">gst_element_query_duration</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-send-event" title="gst_element_send_event ()">gst_element_send_event</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-seek-simple" title="gst_element_seek_simple ()">gst_element_seek_simple</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-seek" title="gst_element_seek ()">gst_element_seek</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-add-property-notify-watch" title="gst_element_add_property_notify_watch ()">gst_element_add_property_notify_watch</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-add-property-deep-notify-watch" title="gst_element_add_property_deep_notify_watch ()">gst_element_add_property_deep_notify_watch</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-remove-property-notify-watch" title="gst_element_remove_property_notify_watch ()">gst_element_remove_property_notify_watch</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <span class="c_punctuation">(</span><a class="link" href="GstElement.html#GstElementCallAsyncFunc" title="GstElementCallAsyncFunc ()">*GstElementCallAsyncFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="GstElement.html#gst-element-call-async" title="gst_element_call_async ()">gst_element_call_async</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="GstElement.signals"></a><h2>Signals</h2>
 <div class="informaltable"><table class="informaltable" border="0">
 <colgroup>
 <col width="150px" class="signals_return">
 <col width="300px" class="signals_name">
 <col width="200px" class="signals_flags">
 </colgroup>
 <tbody>
 <tr>
 <td class="signal_type"><span class="returnvalue">void</span></td>
 <td class="signal_name"><a class="link" href="GstElement.html#GstElement-no-more-pads" title="The “no-more-pads” signal">no-more-pads</a></td>
 <td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobjectgobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
 </tr>
 <tr>
 <td class="signal_type"><span class="returnvalue">void</span></td>
 <td class="signal_name"><a class="link" href="GstElement.html#GstElement-pad-added" title="The “pad-added” signal">pad-added</a></td>
 <td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobjectgobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
 </tr>
 <tr>
 <td class="signal_type"><span class="returnvalue">void</span></td>
 <td class="signal_name"><a class="link" href="GstElement.html#GstElement-pad-removed" title="The “pad-removed” signal">pad-removed</a></td>
 <td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobjectgobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="GstElement.other"></a><h2>Types and Values</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="name">
 <col class="description">
 </colgroup>
 <tbody>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="GstElement.html#GstElement-struct" title="struct GstElement">GstElement</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass">GstElementClass</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">enum</td>
 <td class="function_name"><a class="link" href="GstElement.html#GstElementFlags" title="enum GstElementFlags">GstElementFlags</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">enum</td>
 <td class="function_name"><a class="link" href="GstElement.html#GstState" title="enum GstState">GstState</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">enum</td>
 <td class="function_name"><a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange">GstStateChange</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">enum</td>
 <td class="function_name"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn">GstStateChangeReturn</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="GstElement.html#GST-ELEMENT-METADATA-AUTHOR:CAPS" title="GST_ELEMENT_METADATA_AUTHOR">GST_ELEMENT_METADATA_AUTHOR</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="GstElement.html#GST-ELEMENT-METADATA-DESCRIPTION:CAPS" title="GST_ELEMENT_METADATA_DESCRIPTION">GST_ELEMENT_METADATA_DESCRIPTION</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="GstElement.html#GST-ELEMENT-METADATA-DOC-URI:CAPS" title="GST_ELEMENT_METADATA_DOC_URI">GST_ELEMENT_METADATA_DOC_URI</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="GstElement.html#GST-ELEMENT-METADATA-ICON-NAME:CAPS" title="GST_ELEMENT_METADATA_ICON_NAME">GST_ELEMENT_METADATA_ICON_NAME</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="GstElement.html#GST-ELEMENT-METADATA-KLASS:CAPS" title="GST_ELEMENT_METADATA_KLASS">GST_ELEMENT_METADATA_KLASS</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="GstElement.html#GST-ELEMENT-METADATA-LONGNAME:CAPS" title="GST_ELEMENT_METADATA_LONGNAME">GST_ELEMENT_METADATA_LONGNAME</a></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="GstElement.object-hierarchy"></a><h2>Object Hierarchy</h2>
 <pre class="screen">    <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
     <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
         <span class="lineart">╰──</span> <a class="link" href="GstObject.html" title="GstObject">GstObject</a>
             <span class="lineart">╰──</span> GstElement
                 <span class="lineart">╰──</span> <a class="link" href="GstBin.html" title="GstBin">GstBin</a>
 </pre>
 </div>
 <div class="refsect1">
 <a name="GstElement.derived-interfaces"></a><h2>Known Derived Interfaces</h2>
 <p>
 GstElement is required by
  <a class="link" href="GstTagSetter.html" title="GstTagSetter">GstTagSetter</a>.</p>
 </div>
 <div class="refsect1">
 <a name="GstElement.includes"></a><h2>Includes</h2>
 <pre class="synopsis">#include &lt;gst/gst.h&gt;
 </pre>
 </div>
 <div class="refsect1">
 <a name="GstElement.description"></a><h2>Description</h2>
 <p>GstElement is the abstract base class needed to construct an element that
 can be used in a GStreamer pipeline. Please refer to the plugin writers
 guide for more information on creating <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> subclasses.</p>
 <p>The name of a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> can be get with <a class="link" href="GstElement.html#gst-element-get-name" title="gst_element_get_name()"><code class="function">gst_element_get_name()</code></a> and set with
 <a class="link" href="GstElement.html#gst-element-set-name" title="gst_element_set_name()"><code class="function">gst_element_set_name()</code></a>.  For speed, <a class="link" href="GstElement.html#GST-ELEMENT-NAME:CAPS" title="GST_ELEMENT_NAME()"><code class="function">GST_ELEMENT_NAME()</code></a> can be used in the
 core when using the appropriate locking. Do not use this in plug-ins or
 applications in order to retain ABI compatibility.</p>
 <p>Elements can have pads (of the type <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>).  These pads link to pads on
 other elements.  <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> flow between these linked pads.
 A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> has a <a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> structures for all their input (or sink)
 and output (or source) pads.
 Core and plug-in writers can add and remove pads with <a class="link" href="GstElement.html#gst-element-add-pad" title="gst_element_add_pad ()"><code class="function">gst_element_add_pad()</code></a>
 and <a class="link" href="GstElement.html#gst-element-remove-pad" title="gst_element_remove_pad ()"><code class="function">gst_element_remove_pad()</code></a>.</p>
 <p>An existing pad of an element can be retrieved by name with
 <a class="link" href="GstElement.html#gst-element-get-static-pad" title="gst_element_get_static_pad ()"><code class="function">gst_element_get_static_pad()</code></a>. A new dynamic pad can be created using
 <a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()"><code class="function">gst_element_request_pad()</code></a> with a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>.
 An iterator of all pads can be retrieved with <a class="link" href="GstElement.html#gst-element-iterate-pads" title="gst_element_iterate_pads ()"><code class="function">gst_element_iterate_pads()</code></a>.</p>
 <p>Elements can be linked through their pads.
 If the link is straightforward, use the <a class="link" href="GstElement.html#gst-element-link" title="gst_element_link ()"><code class="function">gst_element_link()</code></a>
 convenience function to link two elements, or <a class="link" href="GstElement.html#gst-element-link-many" title="gst_element_link_many ()"><code class="function">gst_element_link_many()</code></a>
 for more elements in a row.
 Use <a class="link" href="GstElement.html#gst-element-link-filtered" title="gst_element_link_filtered ()"><code class="function">gst_element_link_filtered()</code></a> to link two elements constrained by
 a specified set of <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a>.
 For finer control, use <a class="link" href="GstElement.html#gst-element-link-pads" title="gst_element_link_pads ()"><code class="function">gst_element_link_pads()</code></a> and
 <a class="link" href="GstElement.html#gst-element-link-pads-filtered" title="gst_element_link_pads_filtered ()"><code class="function">gst_element_link_pads_filtered()</code></a> to specify the pads to link on
 each element by name.</p>
 <p>Each element has a state (see <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>).  You can get and set the state
 of an element with <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a> and <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a>.
 Setting a state triggers a <a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a>. To get a string representation
 of a <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>, use <a class="link" href="GstElement.html#gst-element-state-get-name" title="gst_element_state_get_name ()"><code class="function">gst_element_state_get_name()</code></a>.</p>
 <p>You can get and set a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> on an element using <a class="link" href="GstElement.html#gst-element-get-clock" title="gst_element_get_clock ()"><code class="function">gst_element_get_clock()</code></a>
 and <a class="link" href="GstElement.html#gst-element-set-clock" title="gst_element_set_clock ()"><code class="function">gst_element_set_clock()</code></a>.
 Some elements can provide a clock for the pipeline if
 the <a class="link" href="GstElement.html#GST-ELEMENT-FLAG-PROVIDE-CLOCK:CAPS"><span class="type">GST_ELEMENT_FLAG_PROVIDE_CLOCK</span></a> flag is set. With the
 <a class="link" href="GstElement.html#gst-element-provide-clock" title="gst_element_provide_clock ()"><code class="function">gst_element_provide_clock()</code></a> method one can retrieve the clock provided by
 such an element.
 Not all elements require a clock to operate correctly. If the
 <a class="link" href="GstElement.html#GST-ELEMENT-FLAG-REQUIRE-CLOCK:CAPS"><code class="function">GST_ELEMENT_FLAG_REQUIRE_CLOCK()</code></a> flag is set, a clock should be set on the
 element with <a class="link" href="GstElement.html#gst-element-set-clock" title="gst_element_set_clock ()"><code class="function">gst_element_set_clock()</code></a>.</p>
 <p>Note that clock selection and distribution is normally handled by the
 toplevel <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> so the clock functions are only to be used in very
 specific situations.</p>
 </div>
 <div class="refsect1">
 <a name="GstElement.functions_details"></a><h2>Functions</h2>
 <div class="refsect2">
 <a name="GST-STATE:CAPS"></a><h3>GST_STATE()</h3>
 <pre class="programlisting">#define GST_STATE(elem)                 (GST_ELEMENT_CAST(elem)-&gt;current_state)
 </pre>
 <p>This macro returns the current <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> of the element.</p>
 <div class="refsect3">
 <a name="GST-STATE.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return state for.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-GET-NEXT:CAPS"></a><h3>GST_STATE_GET_NEXT()</h3>
 <pre class="programlisting">#define GST_STATE_GET_NEXT(cur,pending)         ((GstState)((cur) + __GST_SIGN ((gint)(pending) - (gint)(cur))))
 </pre>
 <p>Given a current state <em class="parameter"><code>cur</code></em>
  and a target state <em class="parameter"><code>pending</code></em>
 , calculate the next (intermediate)
 <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>.</p>
 <div class="refsect3">
 <a name="GST-STATE-GET-NEXT.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>cur</p></td>
 <td class="parameter_description"><p>A starting <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>pending</p></td>
 <td class="parameter_description"><p>A target <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-NEXT:CAPS"></a><h3>GST_STATE_NEXT()</h3>
 <pre class="programlisting">#define GST_STATE_NEXT(elem)            (GST_ELEMENT_CAST(elem)-&gt;next_state)
 </pre>
 <p>This macro returns the next <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> of the element.</p>
 <div class="refsect3">
 <a name="GST-STATE-NEXT.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the next state for.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-PENDING:CAPS"></a><h3>GST_STATE_PENDING()</h3>
 <pre class="programlisting">#define GST_STATE_PENDING(elem)         (GST_ELEMENT_CAST(elem)-&gt;pending_state)
 </pre>
 <p>This macro returns the currently pending <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> of the element.</p>
 <div class="refsect3">
 <a name="GST-STATE-PENDING.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the pending state for.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-RETURN:CAPS"></a><h3>GST_STATE_RETURN()</h3>
 <pre class="programlisting">#define GST_STATE_RETURN(elem)          (GST_ELEMENT_CAST(elem)-&gt;last_return)
 </pre>
 <p>This macro returns the last <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> value.</p>
 <div class="refsect3">
 <a name="GST-STATE-RETURN.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the last state result for.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-TARGET:CAPS"></a><h3>GST_STATE_TARGET()</h3>
 <pre class="programlisting">#define GST_STATE_TARGET(elem)          (GST_ELEMENT_CAST(elem)-&gt;target_state)
 </pre>
 <p>This macro returns the target <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> of the element.</p>
 <div class="refsect3">
 <a name="GST-STATE-TARGET.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the target state for.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-TRANSITION:CAPS"></a><h3>GST_STATE_TRANSITION()</h3>
 <pre class="programlisting">#define GST_STATE_TRANSITION(cur,next)          ((GstStateChange)(((cur)&lt;&lt;3)|(next)))
 </pre>
 <p>Given a current state <em class="parameter"><code>cur</code></em>
  and a next state <em class="parameter"><code>next</code></em>
 , calculate the associated
 <a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a> transition.</p>
 <div class="refsect3">
 <a name="GST-STATE-TRANSITION.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>cur</p></td>
 <td class="parameter_description"><p>A current state</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>next</p></td>
 <td class="parameter_description"><p>A next state</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-TRANSITION-CURRENT:CAPS"></a><h3>GST_STATE_TRANSITION_CURRENT()</h3>
 <pre class="programlisting">#define GST_STATE_TRANSITION_CURRENT(trans)     ((GstState)((trans)&gt;&gt;3))
 </pre>
 <p>Given a state transition <em class="parameter"><code>trans</code></em>
 , extract the current <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>.</p>
 <div class="refsect3">
 <a name="GST-STATE-TRANSITION-CURRENT.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>trans</p></td>
 <td class="parameter_description"><p>A <a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-TRANSITION-NEXT:CAPS"></a><h3>GST_STATE_TRANSITION_NEXT()</h3>
 <pre class="programlisting">#define GST_STATE_TRANSITION_NEXT(trans)        ((GstState)((trans)&amp;0x7))
 </pre>
 <p>Given a state transition <em class="parameter"><code>trans</code></em>
 , extract the next <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>.</p>
 <div class="refsect3">
 <a name="GST-STATE-TRANSITION-NEXT.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>trans</p></td>
 <td class="parameter_description"><p>A <a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-GET-LOCK:CAPS"></a><h3>GST_STATE_GET_LOCK()</h3>
 <pre class="programlisting">#define GST_STATE_GET_LOCK(elem)               (&amp;(GST_ELEMENT_CAST(elem)-&gt;state_lock))
 </pre>
 <p>Get a reference to the state lock of <em class="parameter"><code>elem</code></em>
 .
 This lock is used by the core.  It is taken while getting or setting
 the state, during state changes, and while finalizing.</p>
 <div class="refsect3">
 <a name="GST-STATE-GET-LOCK.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-STATE-GET-COND:CAPS"></a><h3>GST_STATE_GET_COND()</h3>
 <pre class="programlisting">#define GST_STATE_GET_COND(elem)               (&amp;GST_ELEMENT_CAST(elem)-&gt;state_cond)
 </pre>
 <p>Get the conditional used to signal the completion of a state change.</p>
 <div class="refsect3">
 <a name="GST-STATE-GET-COND.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-NAME:CAPS"></a><h3>GST_ELEMENT_NAME()</h3>
 <pre class="programlisting">#define GST_ELEMENT_NAME(elem)                  (GST_OBJECT_NAME(elem))
 </pre>
 <p>Gets the name of this element. This is not thread-safe by default
 (i.e. you will have to make sure the object lock is taken yourself).
 If in doubt use <a class="link" href="GstElement.html#gst-element-get-name" title="gst_element_get_name()"><code class="function">gst_element_get_name()</code></a> instead.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-NAME.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-PARENT:CAPS"></a><h3>GST_ELEMENT_PARENT()</h3>
 <pre class="programlisting">#define GST_ELEMENT_PARENT(elem)                (GST_ELEMENT_CAST(GST_OBJECT_PARENT(elem)))
 </pre>
 <p>Get the parent object of this element. This is not thread-safe by default
 (i.e. you will have to make sure the object lock is taken yourself).
 If in doubt use <a class="link" href="GstObject.html#gst-object-get-parent" title="gst_object_get_parent ()"><code class="function">gst_object_get_parent()</code></a> instead.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-PARENT.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-BUS:CAPS"></a><h3>GST_ELEMENT_BUS()</h3>
 <pre class="programlisting">#define GST_ELEMENT_BUS(elem)                   (GST_ELEMENT_CAST(elem)-&gt;bus)
 </pre>
 <p>Get the message bus of this element. This is not thread-safe by default
 (i.e. you will have to make sure the object lock is taken yourself).
 If in doubt use <a class="link" href="GstElement.html#gst-element-get-bus" title="gst_element_get_bus ()"><code class="function">gst_element_get_bus()</code></a> instead.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-BUS.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-CLOCK:CAPS"></a><h3>GST_ELEMENT_CLOCK()</h3>
 <pre class="programlisting">#define GST_ELEMENT_CLOCK(elem)                 (GST_ELEMENT_CAST(elem)-&gt;clock)
 </pre>
 <p>Get the clock of this element.This is not thread-safe by default
 (i.e. you will have to make sure it is safe yourself).
 If in doubt use <a class="link" href="GstElement.html#gst-element-get-clock" title="gst_element_get_clock ()"><code class="function">gst_element_get_clock()</code></a> instead.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-CLOCK.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-PADS:CAPS"></a><h3>GST_ELEMENT_PADS()</h3>
 <pre class="programlisting">#define GST_ELEMENT_PADS(elem)                  (GST_ELEMENT_CAST(elem)-&gt;pads)
 </pre>
 <p>Get the pads of this elements.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-PADS.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-START-TIME:CAPS"></a><h3>GST_ELEMENT_START_TIME()</h3>
 <pre class="programlisting">#define GST_ELEMENT_START_TIME(elem)            (GST_ELEMENT_CAST(elem)-&gt;start_time)
 </pre>
 <p>This macro returns the start_time of the <em class="parameter"><code>elem</code></em>
 . The start_time is the
 running_time of the pipeline when the element went to PAUSED.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-START-TIME.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the start time for.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-ERROR:CAPS"></a><h3>GST_ELEMENT_ERROR()</h3>
 <pre class="programlisting">#define             GST_ELEMENT_ERROR(el,domain,code,text,debug)</pre>
 <p>Utility function that elements can use in case they encountered a fatal
 data processing error. The pipeline will post an error message and the
 application will be requested to stop further media processing.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-ERROR.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>el</p></td>
 <td class="parameter_description"><p>the element that generates the error</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>domain</p></td>
 <td class="parameter_description"><p>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>code</p></td>
 <td class="parameter_description"><p>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>text</p></td>
 <td class="parameter_description"><p>the message to display (format string and args enclosed in
 parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>debug</p></td>
 <td class="parameter_description"><p>debugging information for the message (format string and args
 enclosed in parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-ERROR-WITH-DETAILS:CAPS"></a><h3>GST_ELEMENT_ERROR_WITH_DETAILS()</h3>
 <pre class="programlisting">#define             GST_ELEMENT_ERROR_WITH_DETAILS(el,domain,code,text,debug,args)</pre>
 <p>Utility function that elements can use in case they encountered a fatal
 data processing error. The pipeline will post an error message and the
 application will be requested to stop further media processing.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-ERROR-WITH-DETAILS.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>el</p></td>
 <td class="parameter_description"><p>the element that generates the error</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>domain</p></td>
 <td class="parameter_description"><p>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>code</p></td>
 <td class="parameter_description"><p>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>text</p></td>
 <td class="parameter_description"><p>the message to display (format string and args enclosed in
 parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>debug</p></td>
 <td class="parameter_description"><p>debugging information for the message (format string and args
 enclosed in parentheses)
 <em class="parameter"><code>args</code></em>
 optional name, type, value triplets, which will be stored
 in the associated GstStructure. NULL terminator required.
 Must be enclosed within parentheses.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-FLOW-ERROR:CAPS"></a><h3>GST_ELEMENT_FLOW_ERROR()</h3>
 <pre class="programlisting">#define             GST_ELEMENT_FLOW_ERROR(el,flow_return)</pre>
 <p>Utility function that elements can use in case they encountered a fatal
 data processing error due to wrong flow processing.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-FLOW-ERROR.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>el</p></td>
 <td class="parameter_description"><p>the element that generates the error</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>flow_return</p></td>
 <td class="parameter_description"><p>the GstFlowReturn leading to that ERROR message</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-WARNING:CAPS"></a><h3>GST_ELEMENT_WARNING()</h3>
 <pre class="programlisting">#define             GST_ELEMENT_WARNING(el, domain, code, text, debug)</pre>
 <p>Utility function that elements can use in case they encountered a non-fatal
 data processing problem. The pipeline will post a warning message and the
 application will be informed.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-WARNING.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>el</p></td>
 <td class="parameter_description"><p>the element that generates the warning</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>domain</p></td>
 <td class="parameter_description"><p>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>code</p></td>
 <td class="parameter_description"><p>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>text</p></td>
 <td class="parameter_description"><p>the message to display (format string and args enclosed in
 parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>debug</p></td>
 <td class="parameter_description"><p>debugging information for the message (format string and args
 enclosed in parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-WARNING-WITH-DETAILS:CAPS"></a><h3>GST_ELEMENT_WARNING_WITH_DETAILS()</h3>
 <pre class="programlisting">#define             GST_ELEMENT_WARNING_WITH_DETAILS(el, domain, code, text, debug, args)</pre>
 <p>Utility function that elements can use in case they encountered a non-fatal
 data processing problem. The pipeline will post a warning message and the
 application will be informed.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-WARNING-WITH-DETAILS.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>el</p></td>
 <td class="parameter_description"><p>the element that generates the warning</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>domain</p></td>
 <td class="parameter_description"><p>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>code</p></td>
 <td class="parameter_description"><p>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>text</p></td>
 <td class="parameter_description"><p>the message to display (format string and args enclosed in
 parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>debug</p></td>
 <td class="parameter_description"><p>debugging information for the message (format string and args
 enclosed in parentheses)
 <em class="parameter"><code>args</code></em>
 optional name, type, value triplets, which will be stored
 in the associated GstStructure. NULL terminator required.
 Must be enclosed within parentheses.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-INFO:CAPS"></a><h3>GST_ELEMENT_INFO()</h3>
 <pre class="programlisting">#define             GST_ELEMENT_INFO(el, domain, code, text, debug)</pre>
 <p>Utility function that elements can use in case they want to inform
 the application of something noteworthy that is not an error.
 The pipeline will post a info message and the
 application will be informed.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-INFO.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>el</p></td>
 <td class="parameter_description"><p>the element that generates the information</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>domain</p></td>
 <td class="parameter_description"><p>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>code</p></td>
 <td class="parameter_description"><p>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>text</p></td>
 <td class="parameter_description"><p>the message to display (format string and args enclosed in
 parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>debug</p></td>
 <td class="parameter_description"><p>debugging information for the message (format string and args
 enclosed in parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-INFO-WITH-DETAILS:CAPS"></a><h3>GST_ELEMENT_INFO_WITH_DETAILS()</h3>
 <pre class="programlisting">#define             GST_ELEMENT_INFO_WITH_DETAILS(el, domain, code, text, debug, args)</pre>
 <p>Utility function that elements can use in case they want to inform
 the application of something noteworthy that is not an error.
 The pipeline will post a info message and the
 application will be informed.
 Optional name, type, value triplets may be supplied, and will be stored
 in the associated GstStructure. NULL terminator required.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-INFO-WITH-DETAILS.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>el</p></td>
 <td class="parameter_description"><p>the element that generates the information</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>domain</p></td>
 <td class="parameter_description"><p>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>code</p></td>
 <td class="parameter_description"><p>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>text</p></td>
 <td class="parameter_description"><p>the message to display (format string and args enclosed in
 parentheses)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>debug</p></td>
 <td class="parameter_description"><p>debugging information for the message (format string and args
 enclosed in parentheses)
 <em class="parameter"><code>args</code></em>
 optional name, type, value triplets, which will be stored
 in the associated GstStructure. NULL terminator required.
 Must be enclosed within parentheses.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-IS-LOCKED-STATE:CAPS"></a><h3>GST_ELEMENT_IS_LOCKED_STATE()</h3>
 <pre class="programlisting">#define GST_ELEMENT_IS_LOCKED_STATE(elem)        (GST_OBJECT_FLAG_IS_SET(elem,GST_ELEMENT_FLAG_LOCKED_STATE))
 </pre>
 <p>Check if the element is in the locked state and therefore will ignore state
 changes from its parent object.</p>
 <div class="refsect3">
 <a name="GST-ELEMENT-IS-LOCKED-STATE.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-add-pad-template"></a><h3>gst_element_class_add_pad_template ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_class_add_pad_template (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
                                     <em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</code></em>);</pre>
 <p>Adds a padtemplate to an element class. This is mainly used in the _class_init
 functions of classes. If a pad template with the same name as an already
 existing one is added the old one is replaced by the new one.</p>
 <div class="refsect3">
 <a name="gst-element-class-add-pad-template.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>klass</p></td>
 <td class="parameter_description"><p>the <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> to add the pad template to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>templ</p></td>
 <td class="parameter_description"><p> a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to add to the element class. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-add-static-pad-template"></a><h3>gst_element_class_add_static_pad_template ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_class_add_static_pad_template
                                (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> *static_templ</code></em>);</pre>
 <p>Adds a pad template to an element class based on the static pad template
 <em class="parameter"><code>templ</code></em>
 . This is mainly used in the _class_init functions of element
 implementations. If a pad template with the same name already exists,
 the old one is replaced by the new one.</p>
 <div class="refsect3">
 <a name="gst-element-class-add-static-pad-template.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>klass</p></td>
 <td class="parameter_description"><p>the <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> to add the pad template to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>static_templ</p></td>
 <td class="parameter_description"><p><a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> to add as pad template to the element class.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix04.html#api-index-1.8">1.8</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-get-pad-template"></a><h3>gst_element_class_get_pad_template ()</h3>
 <pre class="programlisting"><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> *
 gst_element_class_get_pad_template (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *element_class</code></em>,
                                     <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
 <p>Retrieves a padtemplate from <em class="parameter"><code>element_class</code></em>
  with the given name.</p>
 <div class="note">If you use this function in the <a href="/usr/share/gtk-doc/html/gobjectgobject-Type-Information.html#GInstanceInitFunc"><span class="type">GInstanceInitFunc</span></a> of an object class
 that has subclasses, make sure to pass the g_class parameter of the
 <a href="/usr/share/gtk-doc/html/gobjectgobject-Type-Information.html#GInstanceInitFunc"><span class="type">GInstanceInitFunc</span></a> here.</div>
 <div class="refsect3">
 <a name="gst-element-class-get-pad-template.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element_class</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> to get the pad template of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p>the name of the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to get.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-class-get-pad-template.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> with the
 given name, or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if none was found. No unreferencing is
 necessary. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-get-pad-template-list"></a><h3>gst_element_class_get_pad_template_list ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
 gst_element_class_get_pad_template_list
                                (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *element_class</code></em>);</pre>
 <p>Retrieves a list of the pad templates associated with <em class="parameter"><code>element_class</code></em>
 . The
 list must not be modified by the calling code.</p>
 <div class="note">If you use this function in the <a href="/usr/share/gtk-doc/html/gobjectgobject-Type-Information.html#GInstanceInitFunc"><span class="type">GInstanceInitFunc</span></a> of an object class
 that has subclasses, make sure to pass the g_class parameter of the
 <a href="/usr/share/gtk-doc/html/gobjectgobject-Type-Information.html#GInstanceInitFunc"><span class="type">GInstanceInitFunc</span></a> here.</div>
 <div class="refsect3">
 <a name="gst-element-class-get-pad-template-list.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element_class</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> to get pad templates of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-class-get-pad-template-list.returns"></a><h4>Returns</h4>
 <p> the <a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of
 pad templates. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PadTemplate]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-set-metadata"></a><h3>gst_element_class_set_metadata ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_class_set_metadata (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *longname</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *classification</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *description</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *author</code></em>);</pre>
 <p>Sets the detailed information for a <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a>.</p>
 <div class="note">This function is for use in _class_init functions only.</div>
 <div class="refsect3">
 <a name="gst-element-class-set-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>klass</p></td>
 <td class="parameter_description"><p>class to set metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>longname</p></td>
 <td class="parameter_description"><p>The long English name of the element. E.g. "File Sink"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>classification</p></td>
 <td class="parameter_description"><p>String describing the type of element, as an unordered list
 separated with slashes ('/'). See draft-klass.txt of the design docs
 for more details and common types. E.g: "Sink/File"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>description</p></td>
 <td class="parameter_description"><p>Sentence describing the purpose of the element.
 E.g: "Write stream to a file"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>author</p></td>
 <td class="parameter_description"><p>Name and contact details of the author(s). Use \n to separate
 multiple author metadata. E.g: "Joe Bloggs &lt;joe.blogs at foo.com&gt;"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-set-static-metadata"></a><h3>gst_element_class_set_static_metadata ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_class_set_static_metadata (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *longname</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *classification</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *description</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *author</code></em>);</pre>
 <p>Sets the detailed information for a <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a>.</p>
 <div class="note">This function is for use in _class_init functions only.</div>
 <p>Same as <a class="link" href="GstElement.html#gst-element-class-set-metadata" title="gst_element_class_set_metadata ()"><code class="function">gst_element_class_set_metadata()</code></a>, but <em class="parameter"><code>longname</code></em>
 , <em class="parameter"><code>classification</code></em>
 ,
 <em class="parameter"><code>description</code></em>
 , and <em class="parameter"><code>author</code></em>
  must be static strings or inlined strings, as
 they will not be copied. (GStreamer plugins will be made resident once
 loaded, so this function can be used even from dynamically loaded plugins.)</p>
 <div class="refsect3">
 <a name="gst-element-class-set-static-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>klass</p></td>
 <td class="parameter_description"><p>class to set metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>longname</p></td>
 <td class="parameter_description"><p>The long English name of the element. E.g. "File Sink"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>classification</p></td>
 <td class="parameter_description"><p>String describing the type of element, as an unordered list
 separated with slashes ('/'). See draft-klass.txt of the design docs
 for more details and common types. E.g: "Sink/File"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>description</p></td>
 <td class="parameter_description"><p>Sentence describing the purpose of the element.
 E.g: "Write stream to a file"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>author</p></td>
 <td class="parameter_description"><p>Name and contact details of the author(s). Use \n to separate
 multiple author metadata. E.g: "Joe Bloggs &lt;joe.blogs at foo.com&gt;"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-add-metadata"></a><h3>gst_element_class_add_metadata ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_class_add_metadata (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);</pre>
 <p>Set <em class="parameter"><code>key</code></em>
  with <em class="parameter"><code>value</code></em>
  as metadata in <em class="parameter"><code>klass</code></em>
 .</p>
 <div class="refsect3">
 <a name="gst-element-class-add-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>klass</p></td>
 <td class="parameter_description"><p>class to set metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>key</p></td>
 <td class="parameter_description"><p>the key to set</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>value</p></td>
 <td class="parameter_description"><p>the value to set</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-add-static-metadata"></a><h3>gst_element_class_add_static_metadata ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_class_add_static_metadata (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);</pre>
 <p>Set <em class="parameter"><code>key</code></em>
  with <em class="parameter"><code>value</code></em>
  as metadata in <em class="parameter"><code>klass</code></em>
 .</p>
 <p>Same as <a class="link" href="GstElement.html#gst-element-class-add-metadata" title="gst_element_class_add_metadata ()"><code class="function">gst_element_class_add_metadata()</code></a>, but <em class="parameter"><code>value</code></em>
  must be a static string
 or an inlined string, as it will not be copied. (GStreamer plugins will
 be made resident once loaded, so this function can be used even from
 dynamically loaded plugins.)</p>
 <div class="refsect3">
 <a name="gst-element-class-add-static-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>klass</p></td>
 <td class="parameter_description"><p>class to set metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>key</p></td>
 <td class="parameter_description"><p>the key to set</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>value</p></td>
 <td class="parameter_description"><p>the value to set</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-add-pad"></a><h3>gst_element_add_pad ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_add_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                      <em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
 <p>Adds a pad (link point) to <em class="parameter"><code>element</code></em>
 . <em class="parameter"><code>pad</code></em>
 's parent will be set to <em class="parameter"><code>element</code></em>
 ;
 see <a class="link" href="GstObject.html#gst-object-set-parent" title="gst_object_set_parent ()"><code class="function">gst_object_set_parent()</code></a> for refcounting information.</p>
 <p>Pads are not automatically activated so elements should perform the needed
 steps to activate the pad in case this pad is added in the PAUSED or PLAYING
 state. See <a class="link" href="GstPad.html#gst-pad-set-active" title="gst_pad_set_active ()"><code class="function">gst_pad_set_active()</code></a> for more information about activating pads.</p>
 <p>The pad and the element should be unlocked when calling this function.</p>
 <p>This function will emit the <a class="link" href="GstElement.html#GstElement-pad-added" title="The “pad-added” signal"><span class="type">“pad-added”</span></a> signal on the element.</p>
 <div class="refsect3">
 <a name="gst-element-add-pad.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to add the pad to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>pad</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to add to the element. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-add-pad.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pad could be added. This function can fail when
 a pad with the same name already existed or the pad already had another
 parent.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-create-all-pads"></a><h3>gst_element_create_all_pads ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_create_all_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Creates a pad for each pad template that is always available.
 This function is only useful during object initialization of
 subclasses of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p>
 <div class="refsect3">
 <a name="gst-element-create-all-pads.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p> a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to create pads for. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-compatible-pad"></a><h3>gst_element_get_compatible_pad ()</h3>
 <pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
 gst_element_get_compatible_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                                 <em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
                                 <em class="parameter"><code><a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
 <p>Looks for an unlinked pad to which the given pad can link. It is not
 guaranteed that linking the pads will work, though it should work in most
 cases.</p>
 <p>This function will first attempt to find a compatible unlinked ALWAYS pad,
 and if none can be found, it will request a compatible REQUEST pad by looking
 at the templates of <em class="parameter"><code>element</code></em>
 .</p>
 <div class="refsect3">
 <a name="gst-element-get-compatible-pad.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p> a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> in which the pad should be found. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>pad</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to find a compatible one for. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>caps</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> to use as a filter. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-compatible-pad.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to which a link
 can be made, or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if one cannot be found. <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a>
 after usage. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-compatible-pad-template"></a><h3>gst_element_get_compatible_pad_template ()</h3>
 <pre class="programlisting"><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> *
 gst_element_get_compatible_pad_template
                                (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                                 <em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *compattempl</code></em>);</pre>
 <p>Retrieves a pad template from <em class="parameter"><code>element</code></em>
  that is compatible with <em class="parameter"><code>compattempl</code></em>
 .
 Pads from compatible templates can be linked together.</p>
 <div class="refsect3">
 <a name="gst-element-get-compatible-pad-template.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p> a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get a compatible pad template for. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>compattempl</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to find a compatible
 template for. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-compatible-pad-template.returns"></a><h4>Returns</h4>
 <p> a compatible <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if none was found. No unreferencing is necessary. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-request-pad"></a><h3>gst_element_get_request_pad ()</h3>
 <pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
 gst_element_get_request_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                              <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
 <p>Retrieves a pad from the element by name (e.g. "src_%d"). This version only
 retrieves request pads. The pad should be released with
 <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></a>.</p>
 <p>This method is slower than manually getting the pad template and calling
 <a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()"><code class="function">gst_element_request_pad()</code></a> if the pads should have a specific name (e.g.
 <em class="parameter"><code>name</code></em>
  is "src_1" instead of "src_%u").</p>
 <div class="refsect3">
 <a name="gst-element-get-request-pad.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to find a request pad of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p>the name of the request <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to retrieve.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-request-pad.returns"></a><h4>Returns</h4>
 <p> requested <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> if found,
 otherwise <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.  Release after usage. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-static-pad"></a><h3>gst_element_get_static_pad ()</h3>
 <pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
 gst_element_get_static_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                             <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
 <p>Retrieves a pad from <em class="parameter"><code>element</code></em>
  by name. This version only retrieves
 already-existing (i.e. 'static') pads.</p>
 <div class="refsect3">
 <a name="gst-element-get-static-pad.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to find a static pad of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p>the name of the static <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to retrieve.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-static-pad.returns"></a><h4>Returns</h4>
 <p> the requested <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> if
 found, otherwise <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.  unref after usage.</p>
 <p>MT safe. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-request-pad"></a><h3>gst_element_request_pad ()</h3>
 <pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
 gst_element_request_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                          <em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</code></em>,
                          <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                          <em class="parameter"><code>const <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
 <p>Retrieves a request pad from the element according to the provided template.
 Pad templates can be looked up using
 <a class="link" href="GstElementFactory.html#gst-element-factory-get-static-pad-templates" title="gst_element_factory_get_static_pad_templates ()"><code class="function">gst_element_factory_get_static_pad_templates()</code></a>.</p>
 <p>The pad should be released with <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></a>.</p>
 <p><span class="annotation">[<acronym title="This is the invoker for a virtual method."><span class="acronym">virtual</span></acronym> request_new_pad]</span></p>
 <div class="refsect3">
 <a name="gst-element-request-pad.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to find a request pad of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>templ</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> of which we want a pad of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p> the name of the request <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
 to retrieve. Can be <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>caps</p></td>
 <td class="parameter_description"><p> the caps of the pad we want to
 request. Can be <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-request-pad.returns"></a><h4>Returns</h4>
 <p> requested <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> if found,
 otherwise <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.  Release after usage. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-no-more-pads"></a><h3>gst_element_no_more_pads ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_no_more_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Use this function to signal that the element does not expect any more pads
 to show up in the current pipeline. This function should be called whenever
 pads have been added by the element itself. Elements with <a class="link" href="GstPadTemplate.html#GST-PAD-SOMETIMES:CAPS"><span class="type">GST_PAD_SOMETIMES</span></a>
 pad templates use this in combination with autopluggers to figure out that
 the element is done initializing its pads.</p>
 <p>This function emits the <a class="link" href="GstElement.html#GstElement-no-more-pads" title="The “no-more-pads” signal"><span class="type">“no-more-pads”</span></a> signal.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-no-more-pads.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-release-request-pad"></a><h3>gst_element_release_request_pad ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_release_request_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                                  <em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
 <p>Makes the element free the previously requested pad as obtained
 with <a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()"><code class="function">gst_element_request_pad()</code></a>.</p>
 <p>This does not unref the pad. If the pad was created by using
 <a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()"><code class="function">gst_element_request_pad()</code></a>, <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></a> needs to be
 followed by <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a> to free the <em class="parameter"><code>pad</code></em>
 .</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-release-request-pad.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to release the request pad of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>pad</p></td>
 <td class="parameter_description"><p>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to release.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-remove-pad"></a><h3>gst_element_remove_pad ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_remove_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                         <em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
 <p>Removes <em class="parameter"><code>pad</code></em>
  from <em class="parameter"><code>element</code></em>
 . <em class="parameter"><code>pad</code></em>
  will be destroyed if it has not been
 referenced elsewhere using <a class="link" href="GstObject.html#gst-object-unparent" title="gst_object_unparent ()"><code class="function">gst_object_unparent()</code></a>.</p>
 <p>This function is used by plugin developers and should not be used
 by applications. Pads that were dynamically requested from elements
 with <a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()"><code class="function">gst_element_request_pad()</code></a> should be released with the
 <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></a> function instead.</p>
 <p>Pads are not automatically deactivated so elements should perform the needed
 steps to deactivate the pad in case this pad is removed in the PAUSED or
 PLAYING state. See <a class="link" href="GstPad.html#gst-pad-set-active" title="gst_pad_set_active ()"><code class="function">gst_pad_set_active()</code></a> for more information about
 deactivating pads.</p>
 <p>The pad and the element should be unlocked when calling this function.</p>
 <p>This function will emit the <a class="link" href="GstElement.html#GstElement-pad-removed" title="The “pad-removed” signal"><span class="type">“pad-removed”</span></a> signal on the element.</p>
 <div class="refsect3">
 <a name="gst-element-remove-pad.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to remove pad from.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>pad</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to remove from the element. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-remove-pad.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pad could be removed. Can return <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if the
 pad does not belong to the provided element.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-iterate-pads"></a><h3>gst_element_iterate_pads ()</h3>
 <pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
 gst_element_iterate_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Retrieves an iterator of <em class="parameter"><code>element</code></em>
 's pads. The iterator should
 be freed after usage. Also more specialized iterators exists such as
 <a class="link" href="GstElement.html#gst-element-iterate-src-pads" title="gst_element_iterate_src_pads ()"><code class="function">gst_element_iterate_src_pads()</code></a> or <a class="link" href="GstElement.html#gst-element-iterate-sink-pads" title="gst_element_iterate_sink_pads ()"><code class="function">gst_element_iterate_sink_pads()</code></a>.</p>
 <p>The order of pads returned by the iterator will be the order in which
 the pads were added to the element.</p>
 <div class="refsect3">
 <a name="gst-element-iterate-pads.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to iterate pads of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-iterate-pads.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</p>
 <p>MT safe. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-iterate-sink-pads"></a><h3>gst_element_iterate_sink_pads ()</h3>
 <pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
 gst_element_iterate_sink_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Retrieves an iterator of <em class="parameter"><code>element</code></em>
 's sink pads.</p>
 <p>The order of pads returned by the iterator will be the order in which
 the pads were added to the element.</p>
 <div class="refsect3">
 <a name="gst-element-iterate-sink-pads.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-iterate-sink-pads.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</p>
 <p>MT safe. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-iterate-src-pads"></a><h3>gst_element_iterate_src_pads ()</h3>
 <pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
 gst_element_iterate_src_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Retrieves an iterator of <em class="parameter"><code>element</code></em>
 's source pads.</p>
 <p>The order of pads returned by the iterator will be the order in which
 the pads were added to the element.</p>
 <div class="refsect3">
 <a name="gst-element-iterate-src-pads.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-iterate-src-pads.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</p>
 <p>MT safe. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-link"></a><h3>gst_element_link ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_link (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
                   <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>);</pre>
 <p>Links <em class="parameter"><code>src</code></em>
  to <em class="parameter"><code>dest</code></em>
 . The link must be from source to
 destination; the other direction will not be tried. The function looks for
 existing pads that aren't linked yet. It will request new pads if necessary.
 Such pads need to be released manually when unlinking.
 If multiple links are possible, only one is established.</p>
 <p>Make sure you have added your elements to a bin or pipeline with
 <a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a> before trying to link them.</p>
 <div class="refsect3">
 <a name="gst-element-link.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>src</p></td>
 <td class="parameter_description"><p> a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-link.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the elements could be linked, <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-unlink"></a><h3>gst_element_unlink ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_unlink (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
                     <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>);</pre>
 <p>Unlinks all source pads of the source element with all sink pads
 of the sink element to which they are linked.</p>
 <p>If the link has been made using <a class="link" href="GstElement.html#gst-element-link" title="gst_element_link ()"><code class="function">gst_element_link()</code></a>, it could have created an
 requestpad, which has to be released using <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></a>.</p>
 <div class="refsect3">
 <a name="gst-element-unlink.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>src</p></td>
 <td class="parameter_description"><p> the source <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to unlink. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest</p></td>
 <td class="parameter_description"><p> the sink <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to unlink. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-link-many"></a><h3>gst_element_link_many ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_link_many (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_1</code></em>,
                        <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_2</code></em>,
                        <em class="parameter"><code>...</code></em>);</pre>
 <p>Chain together a series of elements. Uses <a class="link" href="GstElement.html#gst-element-link" title="gst_element_link ()"><code class="function">gst_element_link()</code></a>.
 Make sure you have added your elements to a bin or pipeline with
 <a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a> before trying to link them.</p>
 <div class="refsect3">
 <a name="gst-element-link-many.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element_1</p></td>
 <td class="parameter_description"><p> the first <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> in the link chain. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>element_2</p></td>
 <td class="parameter_description"><p> the second <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> in the link chain. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>...</p></td>
 <td class="parameter_description"><p>the <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated list of elements to link in order.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-link-many.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> on success, <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-unlink-many"></a><h3>gst_element_unlink_many ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_unlink_many (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_1</code></em>,
                          <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_2</code></em>,
                          <em class="parameter"><code>...</code></em>);</pre>
 <p>Unlinks a series of elements. Uses <a class="link" href="GstElement.html#gst-element-unlink" title="gst_element_unlink ()"><code class="function">gst_element_unlink()</code></a>.</p>
 <div class="refsect3">
 <a name="gst-element-unlink-many.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element_1</p></td>
 <td class="parameter_description"><p> the first <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> in the link chain. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>element_2</p></td>
 <td class="parameter_description"><p> the second <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> in the link chain. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>...</p></td>
 <td class="parameter_description"><p>the <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated list of elements to unlink in order.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-link-pads"></a><h3>gst_element_link_pads ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_link_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *srcpadname</code></em>,
                        <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>,
                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *destpadname</code></em>);</pre>
 <p>Links the two named pads of the source and destination elements.
 Side effect is that if one of the pads has no parent, it becomes a
 child of the parent of the other element.  If they have different
 parents, the link fails.</p>
 <div class="refsect3">
 <a name="gst-element-link-pads.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>src</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>srcpadname</p></td>
 <td class="parameter_description"><p> the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in source element
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for any pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>destpadname</p></td>
 <td class="parameter_description"><p> the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in destination element,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for any pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-link-pads.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pads could be linked, <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-link-pads-full"></a><h3>gst_element_link_pads_full ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_link_pads_full (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
                             <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *srcpadname</code></em>,
                             <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>,
                             <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *destpadname</code></em>,
                             <em class="parameter"><code><a class="link" href="GstPad.html#GstPadLinkCheck" title="enum GstPadLinkCheck"><span class="type">GstPadLinkCheck</span></a> flags</code></em>);</pre>
 <p>Links the two named pads of the source and destination elements.
 Side effect is that if one of the pads has no parent, it becomes a
 child of the parent of the other element.  If they have different
 parents, the link fails.</p>
 <p>Calling <a class="link" href="GstElement.html#gst-element-link-pads-full" title="gst_element_link_pads_full ()"><code class="function">gst_element_link_pads_full()</code></a> with <em class="parameter"><code>flags</code></em>
  == <a class="link" href="GstPad.html#GST-PAD-LINK-CHECK-DEFAULT:CAPS"><code class="literal">GST_PAD_LINK_CHECK_DEFAULT</code></a>
 is the same as calling <a class="link" href="GstElement.html#gst-element-link-pads" title="gst_element_link_pads ()"><code class="function">gst_element_link_pads()</code></a> and the recommended way of
 linking pads with safety checks applied.</p>
 <p>This is a convenience function for <a class="link" href="GstPad.html#gst-pad-link-full" title="gst_pad_link_full ()"><code class="function">gst_pad_link_full()</code></a>.</p>
 <div class="refsect3">
 <a name="gst-element-link-pads-full.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>src</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>srcpadname</p></td>
 <td class="parameter_description"><p> the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in source element
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for any pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>destpadname</p></td>
 <td class="parameter_description"><p> the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in destination element,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for any pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>flags</p></td>
 <td class="parameter_description"><p>the <a class="link" href="GstPad.html#GstPadLinkCheck" title="enum GstPadLinkCheck"><span class="type">GstPadLinkCheck</span></a> to be performed when linking pads.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-link-pads-full.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pads could be linked, <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-unlink-pads"></a><h3>gst_element_unlink_pads ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_unlink_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
                          <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *srcpadname</code></em>,
                          <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>,
                          <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *destpadname</code></em>);</pre>
 <p>Unlinks the two named pads of the source and destination elements.</p>
 <p>This is a convenience function for <a class="link" href="GstPad.html#gst-pad-unlink" title="gst_pad_unlink ()"><code class="function">gst_pad_unlink()</code></a>.</p>
 <div class="refsect3">
 <a name="gst-element-unlink-pads.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>src</p></td>
 <td class="parameter_description"><p>a (transfer none): <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>srcpadname</p></td>
 <td class="parameter_description"><p>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in source element.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest</p></td>
 <td class="parameter_description"><p> a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>destpadname</p></td>
 <td class="parameter_description"><p>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in destination element.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-link-pads-filtered"></a><h3>gst_element_link_pads_filtered ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_link_pads_filtered (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *srcpadname</code></em>,
                                 <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *destpadname</code></em>,
                                 <em class="parameter"><code><a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);</pre>
 <p>Links the two named pads of the source and destination elements. Side effect
 is that if one of the pads has no parent, it becomes a child of the parent of
 the other element. If they have different parents, the link fails. If <em class="parameter"><code>caps</code></em>

 is not <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, makes sure that the caps of the link is a subset of <em class="parameter"><code>caps</code></em>
 .</p>
 <div class="refsect3">
 <a name="gst-element-link-pads-filtered.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>src</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>srcpadname</p></td>
 <td class="parameter_description"><p> the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in source element
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for any pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>destpadname</p></td>
 <td class="parameter_description"><p> the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in destination element
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for any pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>filter</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> to filter the link,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for no filter. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-link-pads-filtered.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pads could be linked, <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-link-filtered"></a><h3>gst_element_link_filtered ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_link_filtered (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
                            <em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>,
                            <em class="parameter"><code><a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);</pre>
 <p>Links <em class="parameter"><code>src</code></em>
  to <em class="parameter"><code>dest</code></em>
  using the given caps as filtercaps.
 The link must be from source to
 destination; the other direction will not be tried. The function looks for
 existing pads that aren't linked yet. It will request new pads if necessary.
 If multiple links are possible, only one is established.</p>
 <p>Make sure you have added your elements to a bin or pipeline with
 <a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a> before trying to link them.</p>
 <div class="refsect3">
 <a name="gst-element-link-filtered.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>src</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>filter</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> to filter the link,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for no filter. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-link-filtered.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pads could be linked, <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-class-get-metadata"></a><h3>gst_element_class_get_metadata ()</h3>
 <pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 gst_element_class_get_metadata (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>);</pre>
 <p>Get metadata with <em class="parameter"><code>key</code></em>
  in <em class="parameter"><code>klass</code></em>
 .</p>
 <div class="refsect3">
 <a name="gst-element-class-get-metadata.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>klass</p></td>
 <td class="parameter_description"><p>class to get metadata for</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>key</p></td>
 <td class="parameter_description"><p>the key to get</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-class-get-metadata.returns"></a><h4>Returns</h4>
 <p> the metadata for <em class="parameter"><code>key</code></em>
 .</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-base-time"></a><h3>gst_element_set_base_time ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_set_base_time (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                            <em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);</pre>
 <p>Set the base time of an element. See <a class="link" href="GstElement.html#gst-element-get-base-time" title="gst_element_get_base_time ()"><code class="function">gst_element_get_base_time()</code></a>.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-set-base-time.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>time</p></td>
 <td class="parameter_description"><p>the base time to set.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-base-time"></a><h3>gst_element_get_base_time ()</h3>
 <pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a>
 gst_element_get_base_time (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Returns the base time of the element. The base time is the
 absolute time of the clock when this element was last put to
 PLAYING. Subtracting the base time from the clock time gives
 the running time of the element.</p>
 <div class="refsect3">
 <a name="gst-element-get-base-time.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-base-time.returns"></a><h4>Returns</h4>
 <p> the base time of the element.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-start-time"></a><h3>gst_element_set_start_time ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_set_start_time (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                             <em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);</pre>
 <p>Set the start time of an element. The start time of the element is the
 running time of the element when it last went to the PAUSED state. In READY
 or after a flushing seek, it is set to 0.</p>
 <p>Toplevel elements like <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> will manage the start_time and
 base_time on its children. Setting the start_time to <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><span class="type">GST_CLOCK_TIME_NONE</span></a>
 on such a toplevel element will disable the distribution of the base_time to
 the children and can be useful if the application manages the base_time
 itself, for example if you want to synchronize capture from multiple
 pipelines, and you can also ensure that the pipelines have the same clock.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-set-start-time.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>time</p></td>
 <td class="parameter_description"><p>the base time to set.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-start-time"></a><h3>gst_element_get_start_time ()</h3>
 <pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a>
 gst_element_get_start_time (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Returns the start time of the element. The start time is the
 running time of the clock when this element was last put to PAUSED.</p>
 <p>Usually the start_time is managed by a toplevel element such as
 <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a>.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-get-start-time.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-start-time.returns"></a><h4>Returns</h4>
 <p> the start time of the element.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-bus"></a><h3>gst_element_set_bus ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_set_bus (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                      <em class="parameter"><code><a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> *bus</code></em>);</pre>
 <p>Sets the bus of the element. Increases the refcount on the bus.
 For internal use only, unless you're testing elements.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-set-bus.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the bus of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>bus</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> to set. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-bus"></a><h3>gst_element_get_bus ()</h3>
 <pre class="programlisting"><a class="link" href="GstBus.html" title="GstBus"><span class="returnvalue">GstBus</span></a> *
 gst_element_get_bus (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Returns the bus of the element. Note that only a <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> will provide a
 bus for the application.</p>
 <div class="refsect3">
 <a name="gst-element-get-bus.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the bus of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-bus.returns"></a><h4>Returns</h4>
 <p> the element's <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a>. unref after usage.</p>
 <p>MT safe. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-context"></a><h3>gst_element_set_context ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_set_context (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                          <em class="parameter"><code><a class="link" href="GstContext.html" title="GstContext"><span class="type">GstContext</span></a> *context</code></em>);</pre>
 <p>Sets the context of the element. Increases the refcount of the context.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-set-context.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the context of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstContext.html" title="GstContext"><span class="type">GstContext</span></a> to set. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-context"></a><h3>gst_element_get_context ()</h3>
 <pre class="programlisting"><a class="link" href="GstContext.html" title="GstContext"><span class="returnvalue">GstContext</span></a> *
 gst_element_get_context (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                          <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *context_type</code></em>);</pre>
 <p>Gets the context with <em class="parameter"><code>context_type</code></em>
  set on the element or NULL.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-get-context.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the context of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>context_type</p></td>
 <td class="parameter_description"><p>a name of a context to retrieve</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-context.returns"></a><h4>Returns</h4>
 <p> A <a class="link" href="GstContext.html" title="GstContext"><span class="type">GstContext</span></a> or NULL. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="ix04.html#api-index-1.8">1.8</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-context-unlocked"></a><h3>gst_element_get_context_unlocked ()</h3>
 <pre class="programlisting"><a class="link" href="GstContext.html" title="GstContext"><span class="returnvalue">GstContext</span></a> *
 gst_element_get_context_unlocked (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                                   <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *context_type</code></em>);</pre>
 <p>Gets the context with <em class="parameter"><code>context_type</code></em>
  set on the element or NULL.</p>
 <div class="refsect3">
 <a name="gst-element-get-context-unlocked.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the context of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>context_type</p></td>
 <td class="parameter_description"><p>a name of a context to retrieve</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-context-unlocked.returns"></a><h4>Returns</h4>
 <p> A <a class="link" href="GstContext.html" title="GstContext"><span class="type">GstContext</span></a> or NULL. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="ix04.html#api-index-1.8">1.8</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-contexts"></a><h3>gst_element_get_contexts ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
 gst_element_get_contexts (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Gets the contexts set on the element.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-get-contexts.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the context of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-contexts.returns"></a><h4>Returns</h4>
 <p> List of <a class="link" href="GstContext.html" title="GstContext"><span class="type">GstContext</span></a>. </p>
 <p><span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Context][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="ix04.html#api-index-1.8">1.8</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-factory"></a><h3>gst_element_get_factory ()</h3>
 <pre class="programlisting"><a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="returnvalue">GstElementFactory</span></a> *
 gst_element_get_factory (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Retrieves the factory that was used to create this element.</p>
 <div class="refsect3">
 <a name="gst-element-get-factory.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to request the element factory of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-factory.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a> used for creating this
 element. no refcounting is needed. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-name"></a><h3>gst_element_set_name()</h3>
 <pre class="programlisting">#define                 gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT_CAST(elem),name)
 </pre>
 <p>Sets the name of the element, getting rid of the old name if there was one.</p>
 <div class="refsect3">
 <a name="gst-element-set-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the name of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p>the new name</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-name"></a><h3>gst_element_get_name()</h3>
 <pre class="programlisting">#define                 gst_element_get_name(elem)      gst_object_get_name(GST_OBJECT_CAST(elem))
 </pre>
 <p>Returns a copy of the name of <em class="parameter"><code>elem</code></em>
 .
 Caller should <a href="/usr/share/gtk-doc/html/glibglib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> the return value after usage.
 For a nameless element, this returns <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, which you can safely <a href="/usr/share/gtk-doc/html/glibglib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a>
 as well.</p>
 <div class="refsect3">
 <a name="gst-element-get-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the name of <em class="parameter"><code>elem</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-name.returns"></a><h4>Returns</h4>
 <p> the name of <em class="parameter"><code>elem</code></em>
 . <a href="/usr/share/gtk-doc/html/glibglib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a>
 after usage. MT safe. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-parent"></a><h3>gst_element_set_parent()</h3>
 <pre class="programlisting">#define                 gst_element_set_parent(elem,parent)     gst_object_set_parent(GST_OBJECT_CAST(elem),parent)
 </pre>
 <p>Sets the parent of an element.</p>
 <div class="refsect3">
 <a name="gst-element-set-parent.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the parent of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>parent</p></td>
 <td class="parameter_description"><p>the new parent <a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> of the element.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-parent"></a><h3>gst_element_get_parent()</h3>
 <pre class="programlisting">#define                 gst_element_get_parent(elem)    gst_object_get_parent(GST_OBJECT_CAST(elem))
 </pre>
 <p>Get the parent of an element.</p>
 <div class="refsect3">
 <a name="gst-element-get-parent.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>elem</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the parent of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-parent.returns"></a><h4>Returns</h4>
 <p> the parent of an element. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-clock"></a><h3>gst_element_set_clock ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_set_clock (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                        <em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
 <p>Sets the clock for the element. This function increases the
 refcount on the clock. Any previously set clock on the object
 is unreffed.</p>
 <div class="refsect3">
 <a name="gst-element-set-clock.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the clock for.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>clock</p></td>
 <td class="parameter_description"><p>the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> to set for the element.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-set-clock.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the element accepted the clock. An element can refuse a
 clock when it, for example, is not able to slave its internal clock to the
 <em class="parameter"><code>clock</code></em>
 or when it requires a specific clock to operate.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-clock"></a><h3>gst_element_get_clock ()</h3>
 <pre class="programlisting"><a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> *
 gst_element_get_clock (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Gets the currently configured clock of the element. This is the clock as was
 last set with <a class="link" href="GstElement.html#gst-element-set-clock" title="gst_element_set_clock ()"><code class="function">gst_element_set_clock()</code></a>.</p>
 <p>Elements in a pipeline will only have their clock set when the
 pipeline is in the PLAYING state.</p>
 <div class="refsect3">
 <a name="gst-element-get-clock.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the clock of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-clock.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> of the element. unref after usage.</p>
 <p>MT safe. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-provide-clock"></a><h3>gst_element_provide_clock ()</h3>
 <pre class="programlisting"><a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> *
 gst_element_provide_clock (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Get the clock provided by the given element.</p>
 <div class="note">An element is only required to provide a clock in the PAUSED
 state. Some elements can provide a clock in other states.</div>
 <div class="refsect3">
 <a name="gst-element-provide-clock.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-provide-clock.returns"></a><h4>Returns</h4>
 <p> the GstClock provided by the
 element or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if no clock could be provided.  Unref after usage.</p>
 <p>MT safe. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-state"></a><h3>gst_element_set_state ()</h3>
 <pre class="programlisting"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a>
 gst_element_set_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                        <em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> state</code></em>);</pre>
 <p>Sets the state of the element. This function will try to set the
 requested state by going through all the intermediary states and calling
 the class's state change function for each.</p>
 <p>This function can return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><span class="type">GST_STATE_CHANGE_ASYNC</span></a>, in which case the
 element will perform the remainder of the state change asynchronously in
 another thread.
 An application can use <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a> to wait for the completion
 of the state change or it can wait for a <a class="link" href="GstMessage.html#GST-MESSAGE-ASYNC-DONE:CAPS"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></a> or
 <a class="link" href="GstMessage.html#GST-MESSAGE-STATE-CHANGED:CAPS"><code class="literal">GST_MESSAGE_STATE_CHANGED</code></a> on the bus.</p>
 <p>State changes to <a class="link" href="GstElement.html#GST-STATE-READY:CAPS"><code class="literal">GST_STATE_READY</code></a> or <a class="link" href="GstElement.html#GST-STATE-NULL:CAPS"><code class="literal">GST_STATE_NULL</code></a> never return
 <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><span class="type">GST_STATE_CHANGE_ASYNC</span></a>.</p>
 <div class="refsect3">
 <a name="gst-element-set-state.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to change state of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>state</p></td>
 <td class="parameter_description"><p>the element's new <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-set-state.returns"></a><h4>Returns</h4>
 <p> Result of the state change using <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a>.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-get-state"></a><h3>gst_element_get_state ()</h3>
 <pre class="programlisting"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a>
 gst_element_get_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                        <em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *state</code></em>,
                        <em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *pending</code></em>,
                        <em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> timeout</code></em>);</pre>
 <p>Gets the state of the element.</p>
 <p>For elements that performed an ASYNC state change, as reported by
 <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a>, this function will block up to the
 specified timeout value for the state change to complete.
 If the element completes the state change or goes into
 an error, this function returns immediately with a return value of
 <a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a> or <a class="link" href="GstElement.html#GST-STATE-CHANGE-FAILURE:CAPS"><code class="literal">GST_STATE_CHANGE_FAILURE</code></a> respectively.</p>
 <p>For elements that did not return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a>, this function
 returns the current and pending state immediately.</p>
 <p>This function returns <a class="link" href="GstElement.html#GST-STATE-CHANGE-NO-PREROLL:CAPS"><code class="literal">GST_STATE_CHANGE_NO_PREROLL</code></a> if the element
 successfully changed its state but is not able to provide data yet.
 This mostly happens for live sources that only produce data in
 <a class="link" href="GstElement.html#GST-STATE-PLAYING:CAPS"><code class="literal">GST_STATE_PLAYING</code></a>. While the state change return is equivalent to
 <a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a>, it is returned to the application to signal that
 some sink elements might not be able to complete their state change because
 an element is not producing data to complete the preroll. When setting the
 element to playing, the preroll will complete and playback will start.</p>
 <div class="refsect3">
 <a name="gst-element-get-state.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the state of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>state</p></td>
 <td class="parameter_description"><p> a pointer to <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> to hold the state.
 Can be <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>pending</p></td>
 <td class="parameter_description"><p> a pointer to <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> to hold the pending
 state. Can be <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>timeout</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to specify the timeout for an async
 state change or <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><code class="literal">GST_CLOCK_TIME_NONE</code></a> for infinite timeout.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-get-state.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a> if the element has no more pending state
 and the last state change succeeded, <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a> if the
 element is still performing a state change or
 <a class="link" href="GstElement.html#GST-STATE-CHANGE-FAILURE:CAPS"><code class="literal">GST_STATE_CHANGE_FAILURE</code></a> if the last state change failed.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-set-locked-state"></a><h3>gst_element_set_locked_state ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_set_locked_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                               <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> locked_state</code></em>);</pre>
 <p>Locks the state of an element, so state changes of the parent don't affect
 this element anymore.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-set-locked-state.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>locked_state</p></td>
 <td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to lock the element's state</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-set-locked-state.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the state was changed, <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if bad parameters were given
 or the elements state-locking needed no change.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-is-locked-state"></a><h3>gst_element_is_locked_state ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_is_locked_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Checks if the state of an element is locked.
 If the state of an element is locked, state changes of the parent don't
 affect the element.
 This way you can leave currently unused elements inside bins. Just lock their
 state before changing the state from <a class="link" href="GstElement.html#GST-STATE-NULL:CAPS"><span class="type">GST_STATE_NULL</span></a>.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-is-locked-state.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-is-locked-state.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, if the element's state is locked.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-abort-state"></a><h3>gst_element_abort_state ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_abort_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Abort the state change of the element. This function is used
 by elements that do asynchronous state changes and find out
 something is wrong.</p>
 <p>This function should be called with the STATE_LOCK held.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-abort-state.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to abort the state of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-continue-state"></a><h3>gst_element_continue_state ()</h3>
 <pre class="programlisting"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a>
 gst_element_continue_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                             <em class="parameter"><code><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> ret</code></em>);</pre>
 <p>Commit the state change of the element and proceed to the next
 pending state if any. This function is used
 by elements that do asynchronous state changes.
 The core will normally call this method automatically when an
 element returned <a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a> from the state change function.</p>
 <p>If after calling this method the element still has not reached
 the pending state, the next state change is performed.</p>
 <p>This method is used internally and should normally not be called by plugins
 or applications.</p>
 <div class="refsect3">
 <a name="gst-element-continue-state.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to continue the state change of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>ret</p></td>
 <td class="parameter_description"><p>The previous state return value</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-continue-state.returns"></a><h4>Returns</h4>
 <p> The result of the commit state change.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-lost-state"></a><h3>gst_element_lost_state ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_lost_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Brings the element to the lost state. The current state of the
 element is copied to the pending state so that any call to
 <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a> will return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a>.</p>
 <p>An ASYNC_START message is posted. If the element was PLAYING, it will
 go to PAUSED. The element will be restored to its PLAYING state by
 the parent pipeline when it prerolls again.</p>
 <p>This is mostly used for elements that lost their preroll buffer
 in the <a class="link" href="GstElement.html#GST-STATE-PAUSED:CAPS"><code class="literal">GST_STATE_PAUSED</code></a> or <a class="link" href="GstElement.html#GST-STATE-PLAYING:CAPS"><code class="literal">GST_STATE_PLAYING</code></a> state after a flush,
 they will go to their pending state again when a new preroll buffer is
 queued. This function can only be called when the element is currently
 not in error or an async state change.</p>
 <p>This function is used internally and should normally not be called from
 plugins or applications.</p>
 <div class="refsect3">
 <a name="gst-element-lost-state.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> the state is lost of</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-state-get-name"></a><h3>gst_element_state_get_name ()</h3>
 <pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 gst_element_state_get_name (<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> state</code></em>);</pre>
 <p>Gets a string representing the given state.</p>
 <div class="refsect3">
 <a name="gst-element-state-get-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>state</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> to get the name of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-state-get-name.returns"></a><h4>Returns</h4>
 <p> a string with the name of the state. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-state-change-return-get-name"></a><h3>gst_element_state_change_return_get_name ()</h3>
 <pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 gst_element_state_change_return_get_name
                                (<em class="parameter"><code><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> state_ret</code></em>);</pre>
 <p>Gets a string representing the given state change result.</p>
 <div class="refsect3">
 <a name="gst-element-state-change-return-get-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>state_ret</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> to get the name of.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-state-change-return-get-name.returns"></a><h4>Returns</h4>
 <p> a string with the name of the state
 result. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-sync-state-with-parent"></a><h3>gst_element_sync_state_with_parent ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_sync_state_with_parent (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
 <p>Tries to change the state of the element to the same as its parent.
 If this function returns <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>, the state of element is undefined.</p>
 <div class="refsect3">
 <a name="gst-element-sync-state-with-parent.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-sync-state-with-parent.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, if the element's state could be synced to the parent's state.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-change-state"></a><h3>gst_element_change_state ()</h3>
 <pre class="programlisting"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a>
 gst_element_change_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                           <em class="parameter"><code><a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a> transition</code></em>);</pre>
 <p>Perform <em class="parameter"><code>transition</code></em>
  on <em class="parameter"><code>element</code></em>
 .</p>
 <p>This function must be called with STATE_LOCK held and is mainly used
 internally.</p>
 <div class="refsect3">
 <a name="gst-element-change-state.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>transition</p></td>
 <td class="parameter_description"><p>the requested transition</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-change-state.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> of the state transition.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-message-full"></a><h3>gst_element_message_full ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_message_full (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                           <em class="parameter"><code><a class="link" href="GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *text</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</code></em>,
                           <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *file</code></em>,
                           <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *function</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> line</code></em>);</pre>
 <p>Post an error, warning or info message on the bus from inside an element.</p>
 <p><em class="parameter"><code>type</code></em>
  must be of <a class="link" href="GstMessage.html#GST-MESSAGE-ERROR:CAPS"><span class="type">GST_MESSAGE_ERROR</span></a>, <a class="link" href="GstMessage.html#GST-MESSAGE-WARNING:CAPS"><span class="type">GST_MESSAGE_WARNING</span></a> or
 <a class="link" href="GstMessage.html#GST-MESSAGE-INFO:CAPS"><span class="type">GST_MESSAGE_INFO</span></a>.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-message-full.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to send message from</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>type</p></td>
 <td class="parameter_description"><p>the <a class="link" href="GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>domain</p></td>
 <td class="parameter_description"><p>the GStreamer GError domain this message belongs to</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>code</p></td>
 <td class="parameter_description"><p>the GError code belonging to the domain</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>text</p></td>
 <td class="parameter_description"><p> an allocated text string to be used
 as a replacement for the default message connected to code,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>debug</p></td>
 <td class="parameter_description"><p> an allocated debug message to be
 used as a replacement for the default debugging information,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>file</p></td>
 <td class="parameter_description"><p>the source code file where the error was generated</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>the source code function where the error was generated</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>line</p></td>
 <td class="parameter_description"><p>the source code line where the error was generated</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-message-full-with-details"></a><h3>gst_element_message_full_with_details ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_message_full_with_details (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                                        <em class="parameter"><code><a class="link" href="GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>,
                                        <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
                                        <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
                                        <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *text</code></em>,
                                        <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *file</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *function</code></em>,
                                        <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> line</code></em>,
                                        <em class="parameter"><code><a class="link" href="GstStructure.html" title="GstStructure"><span class="type">GstStructure</span></a> *structure</code></em>);</pre>
 <p>Post an error, warning or info message on the bus from inside an element.</p>
 <p><em class="parameter"><code>type</code></em>
  must be of <a class="link" href="GstMessage.html#GST-MESSAGE-ERROR:CAPS"><span class="type">GST_MESSAGE_ERROR</span></a>, <a class="link" href="GstMessage.html#GST-MESSAGE-WARNING:CAPS"><span class="type">GST_MESSAGE_WARNING</span></a> or
 <a class="link" href="GstMessage.html#GST-MESSAGE-INFO:CAPS"><span class="type">GST_MESSAGE_INFO</span></a>.</p>
 <div class="refsect3">
 <a name="gst-element-message-full-with-details.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to send message from</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>type</p></td>
 <td class="parameter_description"><p>the <a class="link" href="GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>domain</p></td>
 <td class="parameter_description"><p>the GStreamer GError domain this message belongs to</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>code</p></td>
 <td class="parameter_description"><p>the GError code belonging to the domain</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>text</p></td>
 <td class="parameter_description"><p> an allocated text string to be used
 as a replacement for the default message connected to code,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>debug</p></td>
 <td class="parameter_description"><p> an allocated debug message to be
 used as a replacement for the default debugging information,
 or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>file</p></td>
 <td class="parameter_description"><p>the source code file where the error was generated</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>the source code function where the error was generated</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>line</p></td>
 <td class="parameter_description"><p>the source code line where the error was generated</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>structure</p></td>
 <td class="parameter_description"><p> optional details structure. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-make-element-message-details"></a><h3>gst_make_element_message_details ()</h3>
 <pre class="programlisting"><a class="link" href="GstStructure.html" title="GstStructure"><span class="returnvalue">GstStructure</span></a> *
 gst_make_element_message_details (<em class="parameter"><code>const <span class="type">char</span> *name</code></em>,
                                   <em class="parameter"><code>...</code></em>);</pre>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-post-message"></a><h3>gst_element_post_message ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_post_message (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                           <em class="parameter"><code><a class="link" href="GstMessage.html" title="GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);</pre>
 <p>Post a message on the element's <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a>. This function takes ownership of the
 message; if you want to access the message after this call, you should add an
 additional reference before calling.</p>
 <div class="refsect3">
 <a name="gst-element-post-message.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> posting the message</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>message</p></td>
 <td class="parameter_description"><p> a <a class="link" href="GstMessage.html" title="GstMessage"><span class="type">GstMessage</span></a> to post. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-post-message.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the message was successfully posted. The function returns
 <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if the element did not have a bus.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-query"></a><h3>gst_element_query ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_query (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                    <em class="parameter"><code><a class="link" href="GstQuery.html" title="GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
 <p>Performs a query on the given element.</p>
 <p>For elements that don't implement a query handler, this function
 forwards the query to a random srcpad or to the peer of a
 random linked sinkpad of this element.</p>
 <p>Please note that some queries might need a running pipeline to work.</p>
 <div class="refsect3">
 <a name="gst-element-query.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to perform the query on.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>query</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstQuery.html" title="GstQuery"><span class="type">GstQuery</span></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-query.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the query could be performed.</p>
 <p>MT safe.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-query-convert"></a><h3>gst_element_query_convert ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_query_convert (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                            <em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> src_format</code></em>,
                            <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint64"><span class="type">gint64</span></a> src_val</code></em>,
                            <em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> dest_format</code></em>,
                            <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint64"><span class="type">gint64</span></a> *dest_val</code></em>);</pre>
 <p>Queries an element to convert <em class="parameter"><code>src_val</code></em>
  in <em class="parameter"><code>src_format</code></em>
  to <em class="parameter"><code>dest_format</code></em>
 .</p>
 <div class="refsect3">
 <a name="gst-element-query-convert.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to invoke the convert query on.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>src_format</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to convert from.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>src_val</p></td>
 <td class="parameter_description"><p>a value to convert.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest_format</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to convert to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dest_val</p></td>
 <td class="parameter_description"><p> a pointer to the result. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-query-convert.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the query could be performed.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-query-position"></a><h3>gst_element_query_position ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_query_position (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                             <em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
                             <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint64"><span class="type">gint64</span></a> *cur</code></em>);</pre>
 <p>Queries an element (usually top-level pipeline or playbin element) for the
 stream position in nanoseconds. This will be a value between 0 and the
 stream duration (if the stream duration is known). This query will usually
 only work once the pipeline is prerolled (i.e. reached PAUSED or PLAYING
 state). The application will receive an ASYNC_DONE message on the pipeline
 bus when that is the case.</p>
 <p>If one repeatedly calls this function one can also create a query and reuse
 it in <a class="link" href="GstElement.html#gst-element-query" title="gst_element_query ()"><code class="function">gst_element_query()</code></a>.</p>
 <div class="refsect3">
 <a name="gst-element-query-position.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to invoke the position query on.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>format</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> requested</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>cur</p></td>
 <td class="parameter_description"><p> a location in which to store the current
 position, or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-query-position.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the query could be performed.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-query-duration"></a><h3>gst_element_query_duration ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_query_duration (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                             <em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
                             <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint64"><span class="type">gint64</span></a> *duration</code></em>);</pre>
 <p>Queries an element (usually top-level pipeline or playbin element) for the
 total stream duration in nanoseconds. This query will only work once the
 pipeline is prerolled (i.e. reached PAUSED or PLAYING state). The application
 will receive an ASYNC_DONE message on the pipeline bus when that is the case.</p>
 <p>If the duration changes for some reason, you will get a DURATION_CHANGED
 message on the pipeline bus, in which case you should re-query the duration
 using this function.</p>
 <div class="refsect3">
 <a name="gst-element-query-duration.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to invoke the duration query on.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>format</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> requested</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>duration</p></td>
 <td class="parameter_description"><p> A location in which to store the total duration, or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-query-duration.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the query could be performed.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-send-event"></a><h3>gst_element_send_event ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_send_event (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                         <em class="parameter"><code><a class="link" href="GstEvent.html" title="GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);</pre>
 <p>Sends an event to an element. If the element doesn't implement an
 event handler, the event will be pushed on a random linked sink pad for
 downstream events or a random linked source pad for upstream events.</p>
 <p>This function takes ownership of the provided event so you should
 <a class="link" href="GstEvent.html#gst-event-ref" title="gst_event_ref ()"><code class="function">gst_event_ref()</code></a> it if you want to reuse the event after this call.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-send-event.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to send the event to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>event</p></td>
 <td class="parameter_description"><p> the <a class="link" href="GstEvent.html" title="GstEvent"><span class="type">GstEvent</span></a> to send to the element. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-send-event.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the event was handled. Events that trigger a preroll (such
 as flushing seeks and steps) will emit <a class="link" href="GstMessage.html#GST-MESSAGE-ASYNC-DONE:CAPS"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></a>.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-seek-simple"></a><h3>gst_element_seek_simple ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_seek_simple (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                          <em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
                          <em class="parameter"><code><a class="link" href="GstEvent.html#GstSeekFlags" title="enum GstSeekFlags"><span class="type">GstSeekFlags</span></a> seek_flags</code></em>,
                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint64"><span class="type">gint64</span></a> seek_pos</code></em>);</pre>
 <p>Simple API to perform a seek on the given element, meaning it just seeks
 to the given position relative to the start of the stream. For more complex
 operations like segment seeks (e.g. for looping) or changing the playback
 rate or seeking relative to the last configured playback segment you should
 use <a class="link" href="GstElement.html#gst-element-seek" title="gst_element_seek ()"><code class="function">gst_element_seek()</code></a>.</p>
 <p>In a completely prerolled PAUSED or PLAYING pipeline, seeking is always
 guaranteed to return <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> on a seekable media type or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> when the media
 type is certainly not seekable (such as a live stream).</p>
 <p>Some elements allow for seeking in the READY state, in this
 case they will store the seek event and execute it when they are put to
 PAUSED. If the element supports seek in READY, it will always return <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> when
 it receives the event in the READY state.</p>
 <div class="refsect3">
 <a name="gst-element-seek-simple.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to seek on</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>format</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to execute the seek in, such as <a class="link" href="gstreamer-GstFormat.html#GST-FORMAT-TIME:CAPS"><span class="type">GST_FORMAT_TIME</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>seek_flags</p></td>
 <td class="parameter_description"><p>seek options; playback applications will usually want to use
 GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT here</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>seek_pos</p></td>
 <td class="parameter_description"><p>position to seek to (relative to the start); if you are doing
 a seek in <a class="link" href="gstreamer-GstFormat.html#GST-FORMAT-TIME:CAPS"><span class="type">GST_FORMAT_TIME</span></a> this value is in nanoseconds -
 multiply with <a class="link" href="GstClock.html#GST-SECOND:CAPS" title="GST_SECOND"><span class="type">GST_SECOND</span></a> to convert seconds to nanoseconds or
 with <a class="link" href="GstClock.html#GST-MSECOND:CAPS" title="GST_MSECOND"><span class="type">GST_MSECOND</span></a> to convert milliseconds to nanoseconds.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-seek-simple.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the seek operation succeeded. Flushing seeks will trigger a
 preroll, which will emit <a class="link" href="GstMessage.html#GST-MESSAGE-ASYNC-DONE:CAPS"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></a>.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-seek"></a><h3>gst_element_seek ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 gst_element_seek (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> rate</code></em>,
                   <em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
                   <em class="parameter"><code><a class="link" href="GstEvent.html#GstSeekFlags" title="enum GstSeekFlags"><span class="type">GstSeekFlags</span></a> flags</code></em>,
                   <em class="parameter"><code><a class="link" href="GstEvent.html#GstSeekType" title="enum GstSeekType"><span class="type">GstSeekType</span></a> start_type</code></em>,
                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint64"><span class="type">gint64</span></a> start</code></em>,
                   <em class="parameter"><code><a class="link" href="GstEvent.html#GstSeekType" title="enum GstSeekType"><span class="type">GstSeekType</span></a> stop_type</code></em>,
                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint64"><span class="type">gint64</span></a> stop</code></em>);</pre>
 <p>Sends a seek event to an element. See <a class="link" href="GstEvent.html#gst-event-new-seek" title="gst_event_new_seek ()"><code class="function">gst_event_new_seek()</code></a> for the details of
 the parameters. The seek event is sent to the element using
 <a class="link" href="GstElement.html#gst-element-send-event" title="gst_element_send_event ()"><code class="function">gst_element_send_event()</code></a>.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-seek.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to send the event to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>rate</p></td>
 <td class="parameter_description"><p>The new playback rate</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>format</p></td>
 <td class="parameter_description"><p>The format of the seek values</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>flags</p></td>
 <td class="parameter_description"><p>The optional seek flags.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>start_type</p></td>
 <td class="parameter_description"><p>The type and flags for the new start position</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>start</p></td>
 <td class="parameter_description"><p>The value of the new start position</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>stop_type</p></td>
 <td class="parameter_description"><p>The type and flags for the new stop position</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>stop</p></td>
 <td class="parameter_description"><p>The value of the new stop position</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-seek.returns"></a><h4>Returns</h4>
 <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the event was handled. Flushing seeks will trigger a
 preroll, which will emit <a class="link" href="GstMessage.html#GST-MESSAGE-ASYNC-DONE:CAPS"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></a>.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-add-property-notify-watch"></a><h3>gst_element_add_property_notify_watch ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 gst_element_add_property_notify_watch (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                                        <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *property_name</code></em>,
                                        <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> include_value</code></em>);</pre>
 <div class="refsect3">
 <a name="gst-element-add-property-notify-watch.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to watch for property changes</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>property_name</p></td>
 <td class="parameter_description"><p> name of property to watch for changes, or
 NULL to watch all properties. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>include_value</p></td>
 <td class="parameter_description"><p>whether to include the new property value in the message</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-add-property-notify-watch.returns"></a><h4>Returns</h4>
 <p> a watch id, which can be used in connection with
 <a class="link" href="GstElement.html#gst-element-remove-property-notify-watch" title="gst_element_remove_property_notify_watch ()"><code class="function">gst_element_remove_property_notify_watch()</code></a> to remove the watch again.</p>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-add-property-deep-notify-watch"></a><h3>gst_element_add_property_deep_notify_watch ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 gst_element_add_property_deep_notify_watch
                                (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                                 <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *property_name</code></em>,
                                 <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> include_value</code></em>);</pre>
 <div class="refsect3">
 <a name="gst-element-add-property-deep-notify-watch.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to watch (recursively) for property changes</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>property_name</p></td>
 <td class="parameter_description"><p> name of property to watch for changes, or
 NULL to watch all properties. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>include_value</p></td>
 <td class="parameter_description"><p>whether to include the new property value in the message</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="gst-element-add-property-deep-notify-watch.returns"></a><h4>Returns</h4>
 <p> a watch id, which can be used in connection with
 <a class="link" href="GstElement.html#gst-element-remove-property-notify-watch" title="gst_element_remove_property_notify_watch ()"><code class="function">gst_element_remove_property_notify_watch()</code></a> to remove the watch again.</p>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-remove-property-notify-watch"></a><h3>gst_element_remove_property_notify_watch ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_remove_property_notify_watch
                                (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                                 <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gulong"><span class="type">gulong</span></a> watch_id</code></em>);</pre>
 <div class="refsect3">
 <a name="gst-element-remove-property-notify-watch.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> being watched for property changes</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>watch_id</p></td>
 <td class="parameter_description"><p>watch id to remove</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstElementCallAsyncFunc"></a><h3>GstElementCallAsyncFunc ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 <span class="c_punctuation">(</span>*GstElementCallAsyncFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                             <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
 </div>
 <hr>
 <div class="refsect2">
 <a name="gst-element-call-async"></a><h3>gst_element_call_async ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 gst_element_call_async (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
                         <em class="parameter"><code><a class="link" href="GstElement.html#GstElementCallAsyncFunc" title="GstElementCallAsyncFunc ()"><span class="type">GstElementCallAsyncFunc</span></a> func</code></em>,
                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_notify</code></em>);</pre>
 <p>Calls <em class="parameter"><code>func</code></em>
  from another thread and passes <em class="parameter"><code>user_data</code></em>
  to it. This is to be
 used for cases when a state change has to be performed from a streaming
 thread, directly via <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a> or indirectly e.g. via SEEK
 events.</p>
 <p>Calling those functions directly from the streaming thread will cause
 deadlocks in many situations, as they might involve waiting for the
 streaming thread to shut down from this very streaming thread.</p>
 <p>MT safe.</p>
 <div class="refsect3">
 <a name="gst-element-call-async.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>element</p></td>
 <td class="parameter_description"><p>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>Function to call asynchronously from another thread</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>Data to pass to <em class="parameter"><code>func</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>destroy_notify</p></td>
 <td class="parameter_description"><p>GDestroyNotify for <em class="parameter"><code>user_data</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="ix03.html#api-index-1.10">1.10</a></p>
 </div>
 </div>
 <div class="refsect1">
 <a name="GstElement.other_details"></a><h2>Types and Values</h2>
 <div class="refsect2">
 <a name="GstElement-struct"></a><h3>struct GstElement</h3>
 <pre class="programlisting">struct GstElement {
   GRecMutex             state_lock;

   /* element state */
   GCond                 state_cond;
   guint32               state_cookie;
   GstState              target_state;
   GstState              current_state;
   GstState              next_state;
   GstState              pending_state;
   GstStateChangeReturn  last_return;

   GstBus               *bus;

   /* allocated clock */
   GstClock             *clock;
   GstClockTimeDiff      base_time; /* NULL/READY: 0 - PAUSED: current time - PLAYING: difference to clock */
   GstClockTime          start_time;

   /* element pads, these lists can only be iterated while holding
    * the LOCK or checking the cookie after each LOCK. */
   guint16               numpads;
   GList                *pads;
   guint16               numsrcpads;
   GList                *srcpads;
   guint16               numsinkpads;
   GList                *sinkpads;
   guint32               pads_cookie;

   /* with object LOCK */
   GList                *contexts;
 };
 </pre>
 <p>GStreamer element abstract base class.</p>
 <div class="refsect3">
 <a name="GstElement.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Threads.html#GRecMutex"><span class="type">GRecMutex</span></a> <em class="structfield"><code><a name="GstElement-struct.state-lock"></a>state_lock</code></em>;</p></td>
 <td class="struct_member_description"><p>Used to serialize execution of <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a></p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Threads.html#GCond"><span class="type">GCond</span></a> <em class="structfield"><code><a name="GstElement-struct.state-cond"></a>state_cond</code></em>;</p></td>
 <td class="struct_member_description"><p>Used to signal completion of a state change</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint32"><span class="type">guint32</span></a> <em class="structfield"><code><a name="GstElement-struct.state-cookie"></a>state_cookie</code></em>;</p></td>
 <td class="struct_member_description"><p>Used to detect concurrent execution of
 <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a> and <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a></p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> <em class="structfield"><code><a name="GstElement-struct.target-state"></a>target_state</code></em>;</p></td>
 <td class="struct_member_description"><p>the target state of an element as set by the application</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> <em class="structfield"><code><a name="GstElement-struct.current-state"></a>current_state</code></em>;</p></td>
 <td class="struct_member_description"><p>the current state of an element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> <em class="structfield"><code><a name="GstElement-struct.next-state"></a>next_state</code></em>;</p></td>
 <td class="struct_member_description"><p>the next state of an element, can be <a class="link" href="GstElement.html#GST-STATE-VOID-PENDING:CAPS"><span class="type">GST_STATE_VOID_PENDING</span></a> if
 the element is in the correct state.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> <em class="structfield"><code><a name="GstElement-struct.pending-state"></a>pending_state</code></em>;</p></td>
 <td class="struct_member_description"><p>the final state the element should go to, can be
 <a class="link" href="GstElement.html#GST-STATE-VOID-PENDING:CAPS"><span class="type">GST_STATE_VOID_PENDING</span></a> if the element is in the correct state</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> <em class="structfield"><code><a name="GstElement-struct.last-return"></a>last_return</code></em>;</p></td>
 <td class="struct_member_description"><p>the last return value of an element state change</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> *<em class="structfield"><code><a name="GstElement-struct.bus"></a>bus</code></em>;</p></td>
 <td class="struct_member_description"><p>the bus of the element. This bus is provided to the element by the
 parent element or the application. A <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> has a bus of its own.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *<em class="structfield"><code><a name="GstElement-struct.clock"></a>clock</code></em>;</p></td>
 <td class="struct_member_description"><p>the clock of the element. This clock is usually provided to the
 element by the toplevel <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a>.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstClock.html#GstClockTimeDiff" title="GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> <em class="structfield"><code><a name="GstElement-struct.base-time"></a>base_time</code></em>;</p></td>
 <td class="struct_member_description"><p>the time of the clock right before the element is set to
 PLAYING. Subtracting <em class="parameter"><code>base_time</code></em>
 from the current clock time in the PLAYING
 state will yield the running_time against the clock.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> <em class="structfield"><code><a name="GstElement-struct.start-time"></a>start_time</code></em>;</p></td>
 <td class="struct_member_description"><p>the running_time of the last PAUSED state</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint16"><span class="type">guint16</span></a> <em class="structfield"><code><a name="GstElement-struct.numpads"></a>numpads</code></em>;</p></td>
 <td class="struct_member_description"><p>number of pads of the element, includes both source and sink pads.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *<em class="structfield"><code><a name="GstElement-struct.pads"></a>pads</code></em>;</p></td>
 <td class="struct_member_description"><p> list of pads. </p></td>
 <td class="struct_member_annotations"><span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Pad]</span></td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint16"><span class="type">guint16</span></a> <em class="structfield"><code><a name="GstElement-struct.numsrcpads"></a>numsrcpads</code></em>;</p></td>
 <td class="struct_member_description"><p>number of source pads of the element.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *<em class="structfield"><code><a name="GstElement-struct.srcpads"></a>srcpads</code></em>;</p></td>
 <td class="struct_member_description"><p> list of source pads. </p></td>
 <td class="struct_member_annotations"><span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Pad]</span></td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint16"><span class="type">guint16</span></a> <em class="structfield"><code><a name="GstElement-struct.numsinkpads"></a>numsinkpads</code></em>;</p></td>
 <td class="struct_member_description"><p>number of sink pads of the element.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *<em class="structfield"><code><a name="GstElement-struct.sinkpads"></a>sinkpads</code></em>;</p></td>
 <td class="struct_member_description"><p> list of sink pads. </p></td>
 <td class="struct_member_annotations"><span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Pad]</span></td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint32"><span class="type">guint32</span></a> <em class="structfield"><code><a name="GstElement-struct.pads-cookie"></a>pads_cookie</code></em>;</p></td>
 <td class="struct_member_description"><p>updated whenever the a pad is added or removed</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *<em class="structfield"><code><a name="GstElement-struct.contexts"></a>contexts</code></em>;</p></td>
 <td> </td>
 <td> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstElementClass"></a><h3>struct GstElementClass</h3>
 <pre class="programlisting">struct GstElementClass {
   GstObjectClass         parent_class;

   /* the element metadata */
   gpointer		 metadata;

   /* factory that the element was created from */
   GstElementFactory     *elementfactory;

   /* templates for our pads */
   GList                 *padtemplates;
   gint                   numpadtemplates;
   guint32                pad_templ_cookie;

   /* virtual methods for subclasses */

   /* request/release pads */
   /* FIXME 2.0 harmonize naming with gst_element_request_pad */
   GstPad*               (*request_new_pad)      (GstElement *element, GstPadTemplate *templ,
                                                  const gchar* name, const GstCaps *caps);

   void                  (*release_pad)          (GstElement *element, GstPad *pad);

   /* state changes */
   GstStateChangeReturn (*get_state)             (GstElement * element, GstState * state,
                                                  GstState * pending, GstClockTime timeout);
   GstStateChangeReturn (*set_state)             (GstElement *element, GstState state);
   GstStateChangeReturn (*change_state)          (GstElement *element, GstStateChange transition);
   void                 (*state_changed)         (GstElement *element, GstState oldstate,
                                                  GstState newstate, GstState pending);

   /* bus */
   void                  (*set_bus)              (GstElement * element, GstBus * bus);

   /* set/get clocks */
   GstClock*             (*provide_clock)        (GstElement *element);
   gboolean              (*set_clock)            (GstElement *element, GstClock *clock);

   /* query functions */
   gboolean              (*send_event)           (GstElement *element, GstEvent *event);

   gboolean              (*query)                (GstElement *element, GstQuery *query);

   gboolean              (*post_message)         (GstElement *element, GstMessage *message);

   void                  (*set_context)          (GstElement *element, GstContext *context);
 };
 </pre>
 <p>GStreamer element class. Override the vmethods to implement the element
 functionality.</p>
 <div class="refsect3">
 <a name="GstElementClass.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> <em class="structfield"><code><a name="GstElementClass.metadata"></a>metadata</code></em>;</p></td>
 <td class="struct_member_description"><p>metadata for elements of this class</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a> *<em class="structfield"><code><a name="GstElementClass.elementfactory"></a>elementfactory</code></em>;</p></td>
 <td class="struct_member_description"><p>the <a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a> that creates these elements</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *<em class="structfield"><code><a name="GstElementClass.padtemplates"></a>padtemplates</code></em>;</p></td>
 <td class="struct_member_description"><p>a <a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a></p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstElementClass.numpadtemplates"></a>numpadtemplates</code></em>;</p></td>
 <td class="struct_member_description"><p>the number of padtemplates</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint32"><span class="type">guint32</span></a> <em class="structfield"><code><a name="GstElementClass.pad-templ-cookie"></a>pad_templ_cookie</code></em>;</p></td>
 <td class="struct_member_description"><p>changed whenever the padtemplates change</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.request-new-pad"></a>request_new_pad</code></em> ()</p></td>
 <td class="struct_member_description"><p>called when a new pad is requested</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.release-pad"></a>release_pad</code></em> ()</p></td>
 <td class="struct_member_description"><p>called when a request pad is to be released</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.get-state"></a>get_state</code></em> ()</p></td>
 <td class="struct_member_description"><p>get the state of the element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.set-state"></a>set_state</code></em> ()</p></td>
 <td class="struct_member_description"><p>set a new state on the element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.change-state"></a>change_state</code></em> ()</p></td>
 <td class="struct_member_description"><p>called by <em class="parameter"><code>set_state</code></em>
 to perform an incremental state change</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.state-changed"></a>state_changed</code></em> ()</p></td>
 <td class="struct_member_description"><p>called immediately after a new state was set.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.set-bus"></a>set_bus</code></em> ()</p></td>
 <td class="struct_member_description"><p>set a <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> on the element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.provide-clock"></a>provide_clock</code></em> ()</p></td>
 <td class="struct_member_description"><p>gets the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> provided by the element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.set-clock"></a>set_clock</code></em> ()</p></td>
 <td class="struct_member_description"><p>set the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> on the element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.send-event"></a>send_event</code></em> ()</p></td>
 <td class="struct_member_description"><p>send a <a class="link" href="GstEvent.html" title="GstEvent"><span class="type">GstEvent</span></a> to the element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.query"></a>query</code></em> ()</p></td>
 <td class="struct_member_description"><p>perform a <a class="link" href="GstQuery.html" title="GstQuery"><span class="type">GstQuery</span></a> on the element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.post-message"></a>post_message</code></em> ()</p></td>
 <td class="struct_member_description"><p>called when a message is posted on the element. Chain up to
 the parent class' handler to have it posted on the bus.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GstElementClass.set-context"></a>set_context</code></em> ()</p></td>
 <td class="struct_member_description"><p>set a <a class="link" href="GstContext.html" title="GstContext"><span class="type">GstContext</span></a> on the element</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstElementFlags"></a><h3>enum GstElementFlags</h3>
 <p>The standard flags that an element may have.</p>
 <div class="refsect3">
 <a name="GstElementFlags.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="enum_members_name">
 <col class="enum_members_description">
 <col width="200px" class="enum_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="enum_member_name"><p><a name="GST-ELEMENT-FLAG-LOCKED-STATE:CAPS"></a>GST_ELEMENT_FLAG_LOCKED_STATE</p></td>
 <td class="enum_member_description">
 <p>ignore state changes from parent</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-ELEMENT-FLAG-SINK:CAPS"></a>GST_ELEMENT_FLAG_SINK</p></td>
 <td class="enum_member_description">
 <p>the element is a sink</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-ELEMENT-FLAG-SOURCE:CAPS"></a>GST_ELEMENT_FLAG_SOURCE</p></td>
 <td class="enum_member_description">
 <p>the element is a source.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-ELEMENT-FLAG-PROVIDE-CLOCK:CAPS"></a>GST_ELEMENT_FLAG_PROVIDE_CLOCK</p></td>
 <td class="enum_member_description">
 <p>the element can provide a clock</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-ELEMENT-FLAG-REQUIRE-CLOCK:CAPS"></a>GST_ELEMENT_FLAG_REQUIRE_CLOCK</p></td>
 <td class="enum_member_description">
 <p>the element requires a clock</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-ELEMENT-FLAG-INDEXABLE:CAPS"></a>GST_ELEMENT_FLAG_INDEXABLE</p></td>
 <td class="enum_member_description">
 <p>the element can use an index</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-ELEMENT-FLAG-LAST:CAPS"></a>GST_ELEMENT_FLAG_LAST</p></td>
 <td class="enum_member_description">
 <p>offset to define more flags</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstState"></a><h3>enum GstState</h3>
 <p>The possible states an element can be in. States can be changed using
 <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a> and checked using <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a>.</p>
 <div class="refsect3">
 <a name="GstState.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="enum_members_name">
 <col class="enum_members_description">
 <col width="200px" class="enum_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-VOID-PENDING:CAPS"></a>GST_STATE_VOID_PENDING</p></td>
 <td class="enum_member_description">
 <p>no pending state.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-NULL:CAPS"></a>GST_STATE_NULL</p></td>
 <td class="enum_member_description">
 <p>the NULL state or initial state of an element.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-READY:CAPS"></a>GST_STATE_READY</p></td>
 <td class="enum_member_description">
 <p>the element is ready to go to PAUSED.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-PAUSED:CAPS"></a>GST_STATE_PAUSED</p></td>
 <td class="enum_member_description">
 <p>the element is PAUSED, it is ready to accept and
                          process data. Sink elements however only accept one
                          buffer and then block.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-PLAYING:CAPS"></a>GST_STATE_PLAYING</p></td>
 <td class="enum_member_description">
 <p>the element is PLAYING, the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> is running and
                          the data is flowing.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstStateChange"></a><h3>enum GstStateChange</h3>
 <p>These are the different state changes an element goes through.
 <a class="link" href="GstElement.html#GST-STATE-NULL:CAPS"><code class="literal">GST_STATE_NULL</code></a> ⇒ <a class="link" href="GstElement.html#GST-STATE-PLAYING:CAPS"><code class="literal">GST_STATE_PLAYING</code></a> is called an upwards state change
 and <a class="link" href="GstElement.html#GST-STATE-PLAYING:CAPS"><code class="literal">GST_STATE_PLAYING</code></a> ⇒ <a class="link" href="GstElement.html#GST-STATE-NULL:CAPS"><code class="literal">GST_STATE_NULL</code></a> a downwards state change.</p>
 <div class="refsect3">
 <a name="GstStateChange.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="enum_members_name">
 <col class="enum_members_description">
 <col width="200px" class="enum_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-NULL-TO-READY:CAPS"></a>GST_STATE_CHANGE_NULL_TO_READY</p></td>
 <td class="enum_member_description">
 <p>state change from NULL to READY.</p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem"><p>
     The element must check if the resources it needs are available. Device
     sinks and -sources typically try to probe the device to constrain their
     caps.
   </p></li>
 <li class="listitem"><p>
     The element opens the device (in case feature need to be probed).
   </p></li>
 </ul></div>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-READY-TO-PAUSED:CAPS"></a>GST_STATE_CHANGE_READY_TO_PAUSED</p></td>
 <td class="enum_member_description">
 <p>state change from READY to PAUSED.</p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem"><p>
     The element pads are activated in order to receive data in PAUSED.
     Streaming threads are started.
   </p></li>
 <li class="listitem"><p>
     Some elements might need to return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a> and complete
     the state change when they have enough information. It is a requirement
     for sinks to return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a> and complete the state change
     when they receive the first buffer or <a class="link" href="GstEvent.html#GST-EVENT-EOS:CAPS"><code class="literal">GST_EVENT_EOS</code></a> (preroll).
     Sinks also block the dataflow when in PAUSED.
   </p></li>
 <li class="listitem"><p>
     A pipeline resets the running_time to 0.
   </p></li>
 <li class="listitem"><p>
     Live sources return <a class="link" href="GstElement.html#GST-STATE-CHANGE-NO-PREROLL:CAPS"><code class="literal">GST_STATE_CHANGE_NO_PREROLL</code></a> and don't generate data.
   </p></li>
 </ul></div>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-PAUSED-TO-PLAYING:CAPS"></a>GST_STATE_CHANGE_PAUSED_TO_PLAYING</p></td>
 <td class="enum_member_description">
 <p>state change from PAUSED to PLAYING.</p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem"><p>
     Most elements ignore this state change.
   </p></li>
 <li class="listitem"><p>
     The pipeline selects a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> and distributes this to all the children
     before setting them to PLAYING. This means that it is only allowed to
     synchronize on the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> in the PLAYING state.
   </p></li>
 <li class="listitem"><p>
     The pipeline uses the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> and the running_time to calculate the
     base_time. The base_time is distributed to all children when performing
     the state change.
   </p></li>
 <li class="listitem"><p>
     Sink elements stop blocking on the preroll buffer or event and start
     rendering the data.
   </p></li>
 <li class="listitem"><p>
     Sinks can post <a class="link" href="GstMessage.html#GST-MESSAGE-EOS:CAPS"><code class="literal">GST_MESSAGE_EOS</code></a> in the PLAYING state. It is not allowed
     to post <a class="link" href="GstMessage.html#GST-MESSAGE-EOS:CAPS"><code class="literal">GST_MESSAGE_EOS</code></a> when not in the PLAYING state.
   </p></li>
 <li class="listitem"><p>
     While streaming in PAUSED or PLAYING elements can create and remove
     sometimes pads.
   </p></li>
 <li class="listitem"><p>
     Live sources start generating data and return <a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a>.
   </p></li>
 </ul></div>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-PLAYING-TO-PAUSED:CAPS"></a>GST_STATE_CHANGE_PLAYING_TO_PAUSED</p></td>
 <td class="enum_member_description">
 <p>state change from PLAYING to PAUSED.</p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem"><p>
     Most elements ignore this state change.
   </p></li>
 <li class="listitem"><p>
     The pipeline calculates the running_time based on the last selected
     <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> and the base_time. It stores this information to continue
     playback when going back to the PLAYING state.
   </p></li>
 <li class="listitem"><p>
     Sinks unblock any <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> wait calls.
   </p></li>
 <li class="listitem"><p>
     When a sink does not have a pending buffer to play, it returns
     <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a> from this state change and completes the state
     change when it receives a new buffer or an <a class="link" href="GstEvent.html#GST-EVENT-EOS:CAPS"><code class="literal">GST_EVENT_EOS</code></a>.
   </p></li>
 <li class="listitem"><p>
     Any queued <a class="link" href="GstMessage.html#GST-MESSAGE-EOS:CAPS"><code class="literal">GST_MESSAGE_EOS</code></a> items are removed since they will be reposted
     when going back to the PLAYING state. The EOS messages are queued in
     <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> containers.
   </p></li>
 <li class="listitem"><p>
     Live sources stop generating data and return <a class="link" href="GstElement.html#GST-STATE-CHANGE-NO-PREROLL:CAPS"><code class="literal">GST_STATE_CHANGE_NO_PREROLL</code></a>.
   </p></li>
 </ul></div>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-PAUSED-TO-READY:CAPS"></a>GST_STATE_CHANGE_PAUSED_TO_READY</p></td>
 <td class="enum_member_description">
 <p>state change from PAUSED to READY.</p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem"><p>
     Sinks unblock any waits in the preroll.
   </p></li>
 <li class="listitem"><p>
     Elements unblock any waits on devices
   </p></li>
 <li class="listitem"><p>
     Chain or get_range functions return <a class="link" href="GstPad.html#GST-FLOW-FLUSHING:CAPS"><code class="literal">GST_FLOW_FLUSHING</code></a>.
   </p></li>
 <li class="listitem"><p>
     The element pads are deactivated so that streaming becomes impossible and
     all streaming threads are stopped.
   </p></li>
 <li class="listitem"><p>
     The sink forgets all negotiated formats
   </p></li>
 <li class="listitem"><p>
     Elements remove all sometimes pads
   </p></li>
 </ul></div>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-READY-TO-NULL:CAPS"></a>GST_STATE_CHANGE_READY_TO_NULL</p></td>
 <td class="enum_member_description">
 <p>state change from READY to NULL.</p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem"><p>
     Elements close devices
   </p></li>
 <li class="listitem"><p>
     Elements reset any internal state.
   </p></li>
 </ul></div>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstStateChangeReturn"></a><h3>enum GstStateChangeReturn</h3>
 <p>The possible return values from a state change function such as
 <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a>. Only <em class="parameter"><code>GST_STATE_CHANGE_FAILURE</code></em>
  is a real failure.</p>
 <div class="refsect3">
 <a name="GstStateChangeReturn.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="enum_members_name">
 <col class="enum_members_description">
 <col width="200px" class="enum_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-FAILURE:CAPS"></a>GST_STATE_CHANGE_FAILURE</p></td>
 <td class="enum_member_description">
 <p>the state change failed</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-SUCCESS:CAPS"></a>GST_STATE_CHANGE_SUCCESS</p></td>
 <td class="enum_member_description">
 <p>the state change succeeded</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-ASYNC:CAPS"></a>GST_STATE_CHANGE_ASYNC</p></td>
 <td class="enum_member_description">
 <p>the state change will happen asynchronously</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="GST-STATE-CHANGE-NO-PREROLL:CAPS"></a>GST_STATE_CHANGE_NO_PREROLL</p></td>
 <td class="enum_member_description">
 <p>the state change succeeded but the element
                               cannot produce data in <a class="link" href="GstElement.html#GST-STATE-PAUSED:CAPS"><code class="literal">GST_STATE_PAUSED</code></a>.
                               This typically happens with live sources.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-METADATA-AUTHOR:CAPS"></a><h3>GST_ELEMENT_METADATA_AUTHOR</h3>
 <pre class="programlisting">#define GST_ELEMENT_METADATA_AUTHOR        "author"
 </pre>
 <p>Name and contact details of the author(s). Use \n to separate
 multiple author details.
 E.g: "Joe Bloggs &lt;joe.blogs at foo.com&gt;"</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-METADATA-DESCRIPTION:CAPS"></a><h3>GST_ELEMENT_METADATA_DESCRIPTION</h3>
 <pre class="programlisting">#define GST_ELEMENT_METADATA_DESCRIPTION   "description"
 </pre>
 <p>Sentence describing the purpose of the element.
 E.g: "Write stream to a file"</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-METADATA-DOC-URI:CAPS"></a><h3>GST_ELEMENT_METADATA_DOC_URI</h3>
 <pre class="programlisting">#define GST_ELEMENT_METADATA_DOC_URI       "doc-uri"
 </pre>
 <p>Set uri pointing to user documentation. Applications can use this to show
 help for e.g. effects to users.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-METADATA-ICON-NAME:CAPS"></a><h3>GST_ELEMENT_METADATA_ICON_NAME</h3>
 <pre class="programlisting">#define GST_ELEMENT_METADATA_ICON_NAME     "icon-name"
 </pre>
 <p>Elements that bridge to certain other products can include an icon of that
 used product. Application can show the icon in menus/selectors to help
 identifying specific elements.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-METADATA-KLASS:CAPS"></a><h3>GST_ELEMENT_METADATA_KLASS</h3>
 <pre class="programlisting">#define GST_ELEMENT_METADATA_KLASS         "klass"
 </pre>
 <p>String describing the type of element, as an unordered list
 separated with slashes ('/'). See draft-klass.txt of the design docs
 for more details and common types. E.g: "Sink/File"</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GST-ELEMENT-METADATA-LONGNAME:CAPS"></a><h3>GST_ELEMENT_METADATA_LONGNAME</h3>
 <pre class="programlisting">#define GST_ELEMENT_METADATA_LONGNAME      "long-name"
 </pre>
 <p>The long English name of the element. E.g. "File Sink"</p>
 </div>
 </div>
 <div class="refsect1">
 <a name="GstElement.signal-details"></a><h2>Signal Details</h2>
 <div class="refsect2">
 <a name="GstElement-no-more-pads"></a><h3>The <code class="literal">“no-more-pads”</code> signal</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 user_function (<a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *gstelement,
                <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>    user_data)</pre>
 <p>This signals that the element will not generate more dynamic pads.
 Note that this signal will usually be emitted from the context of
 the streaming thread.</p>
 <div class="refsect3">
 <a name="GstElement-no-more-pads.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>gstelement</p></td>
 <td class="parameter_description"><p>the object which received the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p>Flags: <a href="/usr/share/gtk-doc/html/gobjectgobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstElement-pad-added"></a><h3>The <code class="literal">“pad-added”</code> signal</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 user_function (<a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *gstelement,
                <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>     *new_pad,
                <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>    user_data)</pre>
 <p>a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> has been added to the element. Note that this signal will
 usually be emitted from the context of the streaming thread. Also keep in
 mind that if you add new elements to the pipeline in the signal handler
 you will need to set them to the desired target state with
 <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a> or <a class="link" href="GstElement.html#gst-element-sync-state-with-parent" title="gst_element_sync_state_with_parent ()"><code class="function">gst_element_sync_state_with_parent()</code></a>.</p>
 <div class="refsect3">
 <a name="GstElement-pad-added.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>gstelement</p></td>
 <td class="parameter_description"><p>the object which received the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>new_pad</p></td>
 <td class="parameter_description"><p>the pad that has been added</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p>Flags: <a href="/usr/share/gtk-doc/html/gobjectgobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GstElement-pad-removed"></a><h3>The <code class="literal">“pad-removed”</code> signal</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 user_function (<a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *gstelement,
                <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>     *old_pad,
                <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>    user_data)</pre>
 <p>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> has been removed from the element</p>
 <div class="refsect3">
 <a name="GstElement-pad-removed.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>gstelement</p></td>
 <td class="parameter_description"><p>the object which received the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>old_pad</p></td>
 <td class="parameter_description"><p>the pad that has been removed</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p>Flags: <a href="/usr/share/gtk-doc/html/gobjectgobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
 </div>
 </div>
 <div class="refsect1">
 <a name="GstElement.see-also"></a><h2>See Also</h2>
 <p><a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a>, <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a></p>
 </div>
 </div>
 <div class="footer">
 <hr>Generated by GTK-Doc V1.25</div>
 </body>
 </html>