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<h2><span class="refentrytitle"><a name="GstPad.top_of_page"></a>GstPad</span></h2>
<p>GstPad — Object contained by elements that allows links to
other elements</p>
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<a name="GstPad.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gst/gst.h&gt;
struct <a class="link" href="GstPad.html#GstPad-struct" title="struct GstPad">GstPad</a>;
enum <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection">GstPadDirection</a>;
enum <a class="link" href="GstPad.html#GstPadFlags" title="enum GstPadFlags">GstPadFlags</a>;
enum <a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn">GstPadLinkReturn</a>;
#define <a class="link" href="GstPad.html#GST-PAD-LINK-FAILED:CAPS" title="GST_PAD_LINK_FAILED()">GST_PAD_LINK_FAILED</a> (ret)
#define <a class="link" href="GstPad.html#GST-PAD-LINK-SUCCESSFUL:CAPS" title="GST_PAD_LINK_SUCCESSFUL()">GST_PAD_LINK_SUCCESSFUL</a> (ret)
enum <a class="link" href="GstPad.html#GstPadLinkCheck" title="enum GstPadLinkCheck">GstPadLinkCheck</a>;
enum <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn">GstFlowReturn</a>;
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GstPad.html#gst-flow-get-name" title="gst_flow_get_name ()">gst_flow_get_name</a> (<em class="parameter"><code><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> ret</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a> <a class="link" href="GstPad.html#gst-flow-to-quark" title="gst_flow_to_quark ()">gst_flow_to_quark</a> (<em class="parameter"><code><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> ret</code></em>);
enum <a class="link" href="GstPad.html#GstPadMode" title="enum GstPadMode">GstPadMode</a>;
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GstPad.html#gst-pad-mode-get-name" title="gst_pad_mode_get_name ()">gst_pad_mode_get_name</a> (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadMode" title="enum GstPadMode"><span class="type">GstPadMode</span></a> mode</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-get-name" title="gst_pad_get_name()">gst_pad_get_name</a> (pad)
<a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="returnvalue">GstPadDirection</span></a> <a class="link" href="GstPad.html#gst-pad-get-direction" title="gst_pad_get_direction ()">gst_pad_get_direction</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-get-parent" title="gst_pad_get_parent()">gst_pad_get_parent</a> (pad)
<a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * <a class="link" href="GstPad.html#gst-pad-get-parent-element" title="gst_pad_get_parent_element ()">gst_pad_get_parent_element</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * <a class="link" href="GstPad.html#gst-pad-get-pad-template" title="gst_pad_get_pad_template ()">gst_pad_get_pad_template</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="returnvalue">GstPadLinkReturn</span></a> <a class="link" href="GstPad.html#gst-pad-link" title="gst_pad_link ()">gst_pad_link</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *srcpad</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *sinkpad</code></em>);
<a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="returnvalue">GstPadLinkReturn</span></a> <a class="link" href="GstPad.html#gst-pad-link-full" title="gst_pad_link_full ()">gst_pad_link_full</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *srcpad</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *sinkpad</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>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-unlink" title="gst_pad_unlink ()">gst_pad_unlink</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *srcpad</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *sinkpad</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-is-linked" title="gst_pad_is_linked ()">gst_pad_is_linked</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-can-link" title="gst_pad_can_link ()">gst_pad_can_link</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *srcpad</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *sinkpad</code></em>);
<a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="GstPad.html#gst-pad-get-allowed-caps" title="gst_pad_get_allowed_caps ()">gst_pad_get_allowed_caps</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="GstPad.html#gst-pad-get-current-caps" title="gst_pad_get_current_caps ()">gst_pad_get_current_caps</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="GstPad.html#gst-pad-get-pad-template-caps" title="gst_pad_get_pad_template_caps ()">gst_pad_get_pad_template_caps</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstPad.html#gst-pad-get-peer" title="gst_pad_get_peer ()">gst_pad_get_peer</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-use-fixed-caps" title="gst_pad_use_fixed_caps ()">gst_pad_use_fixed_caps</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-has-current-caps" title="gst_pad_has_current_caps ()">gst_pad_has_current_caps</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="returnvalue">GstEvent</span></a> * <a class="link" href="GstPad.html#gst-pad-get-sticky-event" title="gst_pad_get_sticky_event ()">gst_pad_get_sticky_event</a> (<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="gstreamer-GstEvent.html#GstEventType" title="enum GstEventType"><span class="type">GstEventType</span></a> event_type</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (<a class="link" href="GstPad.html#GstPadStickyEventsForeachFunction" title="GstPadStickyEventsForeachFunction ()">*GstPadStickyEventsForeachFunction</a>)
(<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="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> **event</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-sticky-events-foreach" title="gst_pad_sticky_events_foreach ()">gst_pad_sticky_events_foreach</a> (<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="GstPad.html#GstPadStickyEventsForeachFunction" title="GstPadStickyEventsForeachFunction ()"><span class="type">GstPadStickyEventsForeachFunction</span></a> foreach_func</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-is-active" title="gst_pad_is_active ()">gst_pad_is_active</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
enum <a class="link" href="GstPad.html#GstPadProbeReturn" title="enum GstPadProbeReturn">GstPadProbeReturn</a>;
enum <a class="link" href="GstPad.html#GstPadProbeType" title="enum GstPadProbeType">GstPadProbeType</a>;
struct <a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo">GstPadProbeInfo</a>;
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-TYPE:CAPS" title="GST_PAD_PROBE_INFO_TYPE()">GST_PAD_PROBE_INFO_TYPE</a> (d)
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-ID:CAPS" title="GST_PAD_PROBE_INFO_ID()">GST_PAD_PROBE_INFO_ID</a> (d)
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-DATA:CAPS" title="GST_PAD_PROBE_INFO_DATA()">GST_PAD_PROBE_INFO_DATA</a> (d)
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-BUFFER:CAPS" title="GST_PAD_PROBE_INFO_BUFFER()">GST_PAD_PROBE_INFO_BUFFER</a> (d)
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-BUFFER-LIST:CAPS" title="GST_PAD_PROBE_INFO_BUFFER_LIST()">GST_PAD_PROBE_INFO_BUFFER_LIST</a> (d)
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-EVENT:CAPS" title="GST_PAD_PROBE_INFO_EVENT()">GST_PAD_PROBE_INFO_EVENT</a> (d)
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-QUERY:CAPS" title="GST_PAD_PROBE_INFO_QUERY()">GST_PAD_PROBE_INFO_QUERY</a> (d)
<a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="returnvalue">GstBuffer</span></a> * <a class="link" href="GstPad.html#gst-pad-probe-info-get-buffer" title="gst_pad_probe_info_get_buffer ()">gst_pad_probe_info_get_buffer</a> (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>);
<a class="link" href="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> * <a class="link" href="GstPad.html#gst-pad-probe-info-get-buffer-list" title="gst_pad_probe_info_get_buffer_list ()">gst_pad_probe_info_get_buffer_list</a> (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>);
<a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="returnvalue">GstEvent</span></a> * <a class="link" href="GstPad.html#gst-pad-probe-info-get-event" title="gst_pad_probe_info_get_event ()">gst_pad_probe_info_get_event</a> (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>);
<a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="returnvalue">GstQuery</span></a> * <a class="link" href="GstPad.html#gst-pad-probe-info-get-query" title="gst_pad_probe_info_get_query ()">gst_pad_probe_info_get_query</a> (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>);
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-OFFSET:CAPS" title="GST_PAD_PROBE_INFO_OFFSET()">GST_PAD_PROBE_INFO_OFFSET</a> (d)
#define <a class="link" href="GstPad.html#GST-PAD-PROBE-INFO-SIZE:CAPS" title="GST_PAD_PROBE_INFO_SIZE()">GST_PAD_PROBE_INFO_SIZE</a> (d)
<a class="link" href="GstPad.html#GstPadProbeReturn" title="enum GstPadProbeReturn"><span class="returnvalue">GstPadProbeReturn</span></a> (<a class="link" href="GstPad.html#GstPadProbeCallback" title="GstPadProbeCallback ()">*GstPadProbeCallback</a>) (<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="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a> <a class="link" href="GstPad.html#gst-pad-add-probe" title="gst_pad_add_probe ()">gst_pad_add_probe</a> (<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="GstPad.html#GstPadProbeType" title="enum GstPadProbeType"><span class="type">GstPadProbeType</span></a> mask</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeCallback" title="GstPadProbeCallback ()"><span class="type">GstPadProbeCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-remove-probe" title="gst_pad_remove_probe ()">gst_pad_remove_probe</a> (<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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> id</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-is-blocked" title="gst_pad_is_blocked ()">gst_pad_is_blocked</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-is-blocking" title="gst_pad_is_blocking ()">gst_pad_is_blocking</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<span class="returnvalue">gint64</span> <a class="link" href="GstPad.html#gst-pad-get-offset" title="gst_pad_get_offset ()">gst_pad_get_offset</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-offset" title="gst_pad_set_offset ()">gst_pad_set_offset</a> (<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><span class="type">gint64</span> offset</code></em>);
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstPad.html#gst-pad-new" title="gst_pad_new ()">gst_pad_new</a> (<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> direction</code></em>);
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstPad.html#gst-pad-new-from-template" title="gst_pad_new_from_template ()">gst_pad_new_from_template</a> (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstPad.html#gst-pad-new-from-static-template" title="gst_pad_new_from_static_template ()">gst_pad_new_from_static_template</a> (<em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> *templ</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-chain-function" title="gst_pad_set_chain_function()">gst_pad_set_chain_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-chain-function-full" title="gst_pad_set_chain_function_full ()">gst_pad_set_chain_function_full</a> (<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="GstPad.html#GstPadChainFunction" title="GstPadChainFunction ()"><span class="type">GstPadChainFunction</span></a> chain</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (<a class="link" href="GstPad.html#GstPadChainFunction" title="GstPadChainFunction ()">*GstPadChainFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-chain-list-function" title="gst_pad_set_chain_list_function()">gst_pad_set_chain_list_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-chain-list-function-full" title="gst_pad_set_chain_list_function_full ()">gst_pad_set_chain_list_function_full</a>
(<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="GstPad.html#GstPadChainListFunction" title="GstPadChainListFunction ()"><span class="type">GstPadChainListFunction</span></a> chainlist</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (<a class="link" href="GstPad.html#GstPadChainListFunction" title="GstPadChainListFunction ()">*GstPadChainListFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> <a class="link" href="GstPad.html#gst-pad-get-range" title="gst_pad_get_range ()">gst_pad_get_range</a> (<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><span class="type">guint64</span> offset</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> size</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-getrange-function" title="gst_pad_set_getrange_function()">gst_pad_set_getrange_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-getrange-function-full" title="gst_pad_set_getrange_function_full ()">gst_pad_set_getrange_function_full</a> (<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="GstPad.html#GstPadGetRangeFunction" title="GstPadGetRangeFunction ()"><span class="type">GstPadGetRangeFunction</span></a> get</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (<a class="link" href="GstPad.html#GstPadGetRangeFunction" title="GstPadGetRangeFunction ()">*GstPadGetRangeFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><span class="type">guint64</span> offset</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> length</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-event-function" title="gst_pad_set_event_function()">gst_pad_set_event_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-event-function-full" title="gst_pad_set_event_function_full ()">gst_pad_set_event_function_full</a> (<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="GstPad.html#GstPadEventFunction" title="GstPadEventFunction ()"><span class="type">GstPadEventFunction</span></a> event</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (<a class="link" href="GstPad.html#GstPadEventFunction" title="GstPadEventFunction ()">*GstPadEventFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-link-function" title="gst_pad_set_link_function()">gst_pad_set_link_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-link-function-full" title="gst_pad_set_link_function_full ()">gst_pad_set_link_function_full</a> (<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="GstPad.html#GstPadLinkFunction" title="GstPadLinkFunction ()"><span class="type">GstPadLinkFunction</span></a> link</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="returnvalue">GstPadLinkReturn</span></a> (<a class="link" href="GstPad.html#GstPadLinkFunction" title="GstPadLinkFunction ()">*GstPadLinkFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *peer</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-unlink-function" title="gst_pad_set_unlink_function()">gst_pad_set_unlink_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-unlink-function-full" title="gst_pad_set_unlink_function_full ()">gst_pad_set_unlink_function_full</a> (<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="GstPad.html#GstPadUnlinkFunction" title="GstPadUnlinkFunction ()"><span class="type">GstPadUnlinkFunction</span></a> unlink</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<span class="returnvalue">void</span> (<a class="link" href="GstPad.html#GstPadUnlinkFunction" title="GstPadUnlinkFunction ()">*GstPadUnlinkFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-proxy-query-caps" title="gst_pad_proxy_query_caps ()">gst_pad_proxy_query_caps</a> (<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="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-proxy-query-accept-caps" title="gst_pad_proxy_query_accept_caps ()">gst_pad_proxy_query_accept_caps</a> (<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="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-activate-function" title="gst_pad_set_activate_function()">gst_pad_set_activate_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-activate-function-full" title="gst_pad_set_activate_function_full ()">gst_pad_set_activate_function_full</a> (<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="GstPad.html#GstPadActivateFunction" title="GstPadActivateFunction ()"><span class="type">GstPadActivateFunction</span></a> activate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (<a class="link" href="GstPad.html#GstPadActivateFunction" title="GstPadActivateFunction ()">*GstPadActivateFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-activatemode-function" title="gst_pad_set_activatemode_function()">gst_pad_set_activatemode_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-activatemode-function-full" title="gst_pad_set_activatemode_function_full ()">gst_pad_set_activatemode_function_full</a>
(<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="GstPad.html#GstPadActivateModeFunction" title="GstPadActivateModeFunction ()"><span class="type">GstPadActivateModeFunction</span></a> activatemode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (<a class="link" href="GstPad.html#GstPadActivateModeFunction" title="GstPadActivateModeFunction ()">*GstPadActivateModeFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadMode" title="enum GstPadMode"><span class="type">GstPadMode</span></a> mode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-needs-reconfigure" title="gst_pad_needs_reconfigure ()">gst_pad_needs_reconfigure</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-check-reconfigure" title="gst_pad_check_reconfigure ()">gst_pad_check_reconfigure</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-mark-reconfigure" title="gst_pad_mark_reconfigure ()">gst_pad_mark_reconfigure</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> <a class="link" href="GstPad.html#gst-pad-push" title="gst_pad_push ()">gst_pad_push</a> (<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="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-push-event" title="gst_pad_push_event ()">gst_pad_push_event</a> (<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="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> <a class="link" href="GstPad.html#gst-pad-push-list" title="gst_pad_push_list ()">gst_pad_push_list</a> (<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="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> <a class="link" href="GstPad.html#gst-pad-pull-range" title="gst_pad_pull_range ()">gst_pad_pull_range</a> (<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><span class="type">guint64</span> offset</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> size</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-activate-mode" title="gst_pad_activate_mode ()">gst_pad_activate_mode</a> (<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="GstPad.html#GstPadMode" title="enum GstPadMode"><span class="type">GstPadMode</span></a> mode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-send-event" title="gst_pad_send_event ()">gst_pad_send_event</a> (<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="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-event-default" title="gst_pad_event_default ()">gst_pad_event_default</a> (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-query" title="gst_pad_query ()">gst_pad_query</a> (<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="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-peer-query" title="gst_pad_peer_query ()">gst_pad_peer_query</a> (<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="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-query-default" title="gst_pad_query_default ()">gst_pad_query_default</a> (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-query-position" title="gst_pad_query_position ()">gst_pad_query_position</a> (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *cur</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-query-duration" title="gst_pad_query_duration ()">gst_pad_query_duration</a> (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *duration</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-query-convert" title="gst_pad_query_convert ()">gst_pad_query_convert</a> (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> src_format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> 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><span class="type">gint64</span> *dest_val</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-query-accept-caps" title="gst_pad_query_accept_caps ()">gst_pad_query_accept_caps</a> (<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="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="GstPad.html#gst-pad-query-caps" title="gst_pad_query_caps ()">gst_pad_query_caps</a> (<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="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-peer-query-position" title="gst_pad_peer_query_position ()">gst_pad_peer_query_position</a> (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *cur</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-peer-query-duration" title="gst_pad_peer_query_duration ()">gst_pad_peer_query_duration</a> (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *duration</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-peer-query-convert" title="gst_pad_peer_query_convert ()">gst_pad_peer_query_convert</a> (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> src_format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> 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><span class="type">gint64</span> *dest_val</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-peer-query-accept-caps" title="gst_pad_peer_query_accept_caps ()">gst_pad_peer_query_accept_caps</a> (<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="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="GstPad.html#gst-pad-peer-query-caps" title="gst_pad_peer_query_caps ()">gst_pad_peer_query_caps</a> (<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="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-query-function" title="gst_pad_set_query_function()">gst_pad_set_query_function</a> (p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-query-function-full" title="gst_pad_set_query_function_full ()">gst_pad_set_query_function_full</a> (<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="GstPad.html#GstPadQueryFunction" title="GstPadQueryFunction ()"><span class="type">GstPadQueryFunction</span></a> query</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (<a class="link" href="GstPad.html#GstPadQueryFunction" title="GstPadQueryFunction ()">*GstPadQueryFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);
#define <a class="link" href="GstPad.html#gst-pad-set-iterate-internal-links-function" title="gst_pad_set_iterate_internal_links_function()">gst_pad_set_iterate_internal_links_function</a>(p,
f)
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-iterate-internal-links-function-full" title="gst_pad_set_iterate_internal_links_function_full ()">gst_pad_set_iterate_internal_links_function_full</a>
(<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="GstPad.html#GstPadIterIntLinkFunction" title="GstPadIterIntLinkFunction ()"><span class="type">GstPadIterIntLinkFunction</span></a> iterintlink</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * (<a class="link" href="GstPad.html#GstPadIterIntLinkFunction" title="GstPadIterIntLinkFunction ()">*GstPadIterIntLinkFunction</a>) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstPad.html#gst-pad-iterate-internal-links" title="gst_pad_iterate_internal_links ()">gst_pad_iterate_internal_links</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstPad.html#gst-pad-iterate-internal-links-default" title="gst_pad_iterate_internal_links_default ()">gst_pad_iterate_internal_links_default</a>
(<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstPad.html#gst-pad-set-element-private" title="gst_pad_set_element_private ()">gst_pad_set_element_private</a> (<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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> priv</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a> <a class="link" href="GstPad.html#gst-pad-get-element-private" title="gst_pad_get_element_private ()">gst_pad_get_element_private</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GstPad.html#gst-pad-create-stream-id" title="gst_pad_create_stream_id ()">gst_pad_create_stream_id</a> (<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="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *parent</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *stream_id</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GstPad.html#gst-pad-create-stream-id-printf" title="gst_pad_create_stream_id_printf ()">gst_pad_create_stream_id_printf</a> (<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="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *parent</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *stream_id</code></em>,
<em class="parameter"><code>...</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GstPad.html#gst-pad-create-stream-id-printf-valist" title="gst_pad_create_stream_id_printf_valist ()">gst_pad_create_stream_id_printf_valist</a>
(<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="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *parent</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *stream_id</code></em>,
<em class="parameter"><code><span class="type">va_list</span> var_args</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (<a class="link" href="GstPad.html#GstPadForwardFunction" title="GstPadForwardFunction ()">*GstPadForwardFunction</a>) (<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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-forward" title="gst_pad_forward ()">gst_pad_forward</a> (<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="GstPad.html#GstPadForwardFunction" title="GstPadForwardFunction ()"><span class="type">GstPadForwardFunction</span></a> forward</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> <a class="link" href="GstPad.html#gst-pad-chain" title="gst_pad_chain ()">gst_pad_chain</a> (<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="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> <a class="link" href="GstPad.html#gst-pad-chain-list" title="gst_pad_chain_list ()">gst_pad_chain_list</a> (<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="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-start-task" title="gst_pad_start_task ()">gst_pad_start_task</a> (<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="GstTask.html#GstTaskFunction" title="GstTaskFunction ()"><span class="type">GstTaskFunction</span></a> func</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-pause-task" title="gst_pad_pause_task ()">gst_pad_pause_task</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-stop-task" title="gst_pad_stop_task ()">gst_pad_stop_task</a> (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPad.html#gst-pad-set-active" title="gst_pad_set_active ()">gst_pad_set_active</a> (<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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);
#define <a class="link" href="GstPad.html#GST-PAD-GET-STREAM-LOCK:CAPS" title="GST_PAD_GET_STREAM_LOCK()">GST_PAD_GET_STREAM_LOCK</a> (pad)
#define <a class="link" href="GstPad.html#GST-PAD-STREAM-LOCK:CAPS" title="GST_PAD_STREAM_LOCK()">GST_PAD_STREAM_LOCK</a> (pad)
#define <a class="link" href="GstPad.html#GST-PAD-STREAM-TRYLOCK:CAPS" title="GST_PAD_STREAM_TRYLOCK()">GST_PAD_STREAM_TRYLOCK</a> (pad)
#define <a class="link" href="GstPad.html#GST-PAD-STREAM-UNLOCK:CAPS" title="GST_PAD_STREAM_UNLOCK()">GST_PAD_STREAM_UNLOCK</a> (pad)
</pre>
</div>
<div class="refsect1">
<a name="GstPad.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a class="link" href="GstObject.html" title="GstObject">GstObject</a>
+----GstPad
+----<a class="link" href="GstGhostPad.html#GstProxyPad">GstProxyPad</a>
</pre>
</div>
<div class="refsect1">
<a name="GstPad.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="GstPad.html#GstPad--caps" title='The "caps" property'>caps</a>" <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a>* : Read
"<a class="link" href="GstPad.html#GstPad--direction" title='The "direction" property'>direction</a>" <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> : Read / Write / Construct Only
"<a class="link" href="GstPad.html#GstPad--template" title='The "template" property'>template</a>" <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>* : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="GstPad.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="GstPad.html#GstPad-linked" title='The "linked" signal'>linked</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
"<a class="link" href="GstPad.html#GstPad-unlinked" title='The "unlinked" signal'>unlinked</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
</pre>
</div>
<div class="refsect1">
<a name="GstPad.description"></a><h2>Description</h2>
<p>
A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> is linked to other elements via "pads", which are extremely
light-weight generic link points.
</p>
<p>
Pads have a <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a>, source pads produce data, sink pads consume
data.
</p>
<p>
Pads are typically created from a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> with
<a class="link" href="GstPad.html#gst-pad-new-from-template" title="gst_pad_new_from_template ()"><code class="function">gst_pad_new_from_template()</code></a> and are then added to a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>. This usually
happens when the element is created but it can also happen dynamically based
on the data that the element is processing or based on the pads that the
application requests.
</p>
<p>
Pads without pad templates can be created with <a class="link" href="GstPad.html#gst-pad-new" title="gst_pad_new ()"><code class="function">gst_pad_new()</code></a>,
which takes a direction and a name as an argument. If the name is NULL,
then a guaranteed unique name will be assigned to it.
</p>
<p>
A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> creating a pad will typically use the various
gst_pad_set_*_function() calls to register callbacks for events, queries or
dataflow on the pads.
</p>
<p>
<a class="link" href="GstPad.html#gst-pad-get-parent" title="gst_pad_get_parent()"><code class="function">gst_pad_get_parent()</code></a> will retrieve the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> that owns the pad.
</p>
<p>
After two pads are retrieved from an element with <code class="function">gst_element_get_pad()</code>,
the pads can be linked with <a class="link" href="GstPad.html#gst-pad-link" title="gst_pad_link ()"><code class="function">gst_pad_link()</code></a>. (For quick links,
you can also use <a class="link" href="GstElement.html#gst-element-link" title="gst_element_link ()"><code class="function">gst_element_link()</code></a>, which will make the obvious
link for you if it's straightforward.). Pads can be unlinked again with
<a class="link" href="GstPad.html#gst-pad-unlink" title="gst_pad_unlink ()"><code class="function">gst_pad_unlink()</code></a>. <a class="link" href="GstPad.html#gst-pad-get-peer" title="gst_pad_get_peer ()"><code class="function">gst_pad_get_peer()</code></a> can be used to check what the pad is
linked to.
</p>
<p>
Before dataflow is possible on the pads, they need to be activated with
<a class="link" href="GstPad.html#gst-pad-set-active" title="gst_pad_set_active ()"><code class="function">gst_pad_set_active()</code></a>.
</p>
<p>
<a class="link" href="GstPad.html#gst-pad-query" title="gst_pad_query ()"><code class="function">gst_pad_query()</code></a> and <a class="link" href="GstPad.html#gst-pad-peer-query" title="gst_pad_peer_query ()"><code class="function">gst_pad_peer_query()</code></a> can be used to query various
properties of the pad and the stream.
</p>
<p>
To send a <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> on a pad, use <a class="link" href="GstPad.html#gst-pad-send-event" title="gst_pad_send_event ()"><code class="function">gst_pad_send_event()</code></a> and
<a class="link" href="GstPad.html#gst-pad-push-event" title="gst_pad_push_event ()"><code class="function">gst_pad_push_event()</code></a>. Some events will be sticky on the pad, meaning that
after they pass on the pad they can be queried later with
<a class="link" href="GstPad.html#gst-pad-get-sticky-event" title="gst_pad_get_sticky_event ()"><code class="function">gst_pad_get_sticky_event()</code></a> and <a class="link" href="GstPad.html#gst-pad-sticky-events-foreach" title="gst_pad_sticky_events_foreach ()"><code class="function">gst_pad_sticky_events_foreach()</code></a>.
<a class="link" href="GstPad.html#gst-pad-get-current-caps" title="gst_pad_get_current_caps ()"><code class="function">gst_pad_get_current_caps()</code></a> and <a class="link" href="GstPad.html#gst-pad-has-current-caps" title="gst_pad_has_current_caps ()"><code class="function">gst_pad_has_current_caps()</code></a> are convenience
functions to query the current sticky CAPS event on a pad.
</p>
<p>
GstElements will use <a class="link" href="GstPad.html#gst-pad-push" title="gst_pad_push ()"><code class="function">gst_pad_push()</code></a> and <a class="link" href="GstPad.html#gst-pad-pull-range" title="gst_pad_pull_range ()"><code class="function">gst_pad_pull_range()</code></a> to push out
or pull in a buffer.
</p>
<p>
The dataflow, events and queries that happen on a pad can be monitored with
probes that can be installed with <a class="link" href="GstPad.html#gst-pad-add-probe" title="gst_pad_add_probe ()"><code class="function">gst_pad_add_probe()</code></a>. <a class="link" href="GstPad.html#gst-pad-is-blocked" title="gst_pad_is_blocked ()"><code class="function">gst_pad_is_blocked()</code></a>
can be used to check if a block probe is installed on the pad.
<a class="link" href="GstPad.html#gst-pad-is-blocking" title="gst_pad_is_blocking ()"><code class="function">gst_pad_is_blocking()</code></a> checks if the blocking probe is currently blocking the
pad. <a class="link" href="GstPad.html#gst-pad-remove-probe" title="gst_pad_remove_probe ()"><code class="function">gst_pad_remove_probe()</code></a> is used to remove a previously installed probe
and unblock blocking probes if any.
</p>
<p>
Pad have an offset that can be retrieved with <a class="link" href="GstPad.html#gst-pad-get-offset" title="gst_pad_get_offset ()"><code class="function">gst_pad_get_offset()</code></a>. This
offset will be applied to the running_time of all data passing over the pad.
<a class="link" href="GstPad.html#gst-pad-set-offset" title="gst_pad_set_offset ()"><code class="function">gst_pad_set_offset()</code></a> can be used to change the offset.
</p>
<p>
Convenience functions exist to start, pause and stop the task on a pad with
<a class="link" href="GstPad.html#gst-pad-start-task" title="gst_pad_start_task ()"><code class="function">gst_pad_start_task()</code></a>, <a class="link" href="GstPad.html#gst-pad-pause-task" title="gst_pad_pause_task ()"><code class="function">gst_pad_pause_task()</code></a> and <a class="link" href="GstPad.html#gst-pad-stop-task" title="gst_pad_stop_task ()"><code class="function">gst_pad_stop_task()</code></a>
respectively.
</p>
<p>
Last reviewed on 2012-03-29 (0.11.3)
</p>
</div>
<div class="refsect1">
<a name="GstPad.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstPad-struct"></a><h3>struct GstPad</h3>
<pre class="programlisting">struct GstPad {
gpointer element_private;
GstPadTemplate *padtemplate;
GstPadDirection direction;
};
</pre>
<p>
The <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> structure. Use the functions to update the variables.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> <em class="structfield"><code><a name="GstPad-struct.element-private"></a>element_private</code></em>;</span></p></td>
<td>private data owned by the parent element</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *<em class="structfield"><code><a name="GstPad-struct.padtemplate"></a>padtemplate</code></em>;</span></p></td>
<td>padtemplate for this pad</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> <em class="structfield"><code><a name="GstPad-struct.direction"></a>direction</code></em>;</span></p></td>
<td>the direction of the pad, cannot change after creating
the pad.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadDirection"></a><h3>enum GstPadDirection</h3>
<pre class="programlisting">typedef enum {
GST_PAD_UNKNOWN,
GST_PAD_SRC,
GST_PAD_SINK
} GstPadDirection;
</pre>
<p>
The direction of a pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-PAD-UNKNOWN:CAPS"></a><span class="term"><code class="literal">GST_PAD_UNKNOWN</code></span></p></td>
<td>direction is unknown.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-SRC:CAPS"></a><span class="term"><code class="literal">GST_PAD_SRC</code></span></p></td>
<td>the pad is a source pad.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-SINK:CAPS"></a><span class="term"><code class="literal">GST_PAD_SINK</code></span></p></td>
<td>the pad is a sink pad.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadFlags"></a><h3>enum GstPadFlags</h3>
<pre class="programlisting">typedef enum {
GST_PAD_FLAG_BLOCKED = (GST_OBJECT_FLAG_LAST &lt;&lt; 0),
GST_PAD_FLAG_FLUSHING = (GST_OBJECT_FLAG_LAST &lt;&lt; 1),
GST_PAD_FLAG_EOS = (GST_OBJECT_FLAG_LAST &lt;&lt; 2),
GST_PAD_FLAG_BLOCKING = (GST_OBJECT_FLAG_LAST &lt;&lt; 3),
GST_PAD_FLAG_NEED_PARENT = (GST_OBJECT_FLAG_LAST &lt;&lt; 4),
GST_PAD_FLAG_NEED_RECONFIGURE = (GST_OBJECT_FLAG_LAST &lt;&lt; 5),
GST_PAD_FLAG_PENDING_EVENTS = (GST_OBJECT_FLAG_LAST &lt;&lt; 6),
GST_PAD_FLAG_FIXED_CAPS = (GST_OBJECT_FLAG_LAST &lt;&lt; 7),
GST_PAD_FLAG_PROXY_CAPS = (GST_OBJECT_FLAG_LAST &lt;&lt; 8),
GST_PAD_FLAG_PROXY_ALLOCATION = (GST_OBJECT_FLAG_LAST &lt;&lt; 9),
GST_PAD_FLAG_PROXY_SCHEDULING = (GST_OBJECT_FLAG_LAST &lt;&lt; 10),
/* padding */
GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST &lt;&lt; 16)
} GstPadFlags;
</pre>
<p>
Pad state flags
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-PAD-FLAG-BLOCKED:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_BLOCKED</code></span></p></td>
<td>is dataflow on a pad blocked
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-FLUSHING:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_FLUSHING</code></span></p></td>
<td>is pad flushing
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-EOS:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_EOS</code></span></p></td>
<td>is pad in EOS state
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-BLOCKING:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_BLOCKING</code></span></p></td>
<td>is pad currently blocking on a buffer or event
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-NEED-PARENT:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_NEED_PARENT</code></span></p></td>
<td>ensure that there is a parent object before calling
into the pad callbacks.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-NEED-RECONFIGURE:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_NEED_RECONFIGURE</code></span></p></td>
<td>the pad should be reconfigured/renegotiated.
The flag has to be unset manually after
reconfiguration happened.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-PENDING-EVENTS:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_PENDING_EVENTS</code></span></p></td>
<td>the pad has pending events
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-FIXED-CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_FIXED_CAPS</code></span></p></td>
<td>the pad is using fixed caps this means that once the
caps are set on the pad, the caps query function only
returns those caps.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-PROXY-CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_PROXY_CAPS</code></span></p></td>
<td>the default event and query handler will forward
all events and queries to the internally linked pads
instead of discarding them.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-PROXY-ALLOCATION:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_PROXY_ALLOCATION</code></span></p></td>
<td>the default query handler will forward
allocation queries to the internally linked pads
instead of discarding them.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-PROXY-SCHEDULING:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_PROXY_SCHEDULING</code></span></p></td>
<td>the default query handler will forward
scheduling queries to the internally linked pads
instead of discarding them.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-FLAG-LAST:CAPS"></a><span class="term"><code class="literal">GST_PAD_FLAG_LAST</code></span></p></td>
<td>offset to define more flags
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadLinkReturn"></a><h3>enum GstPadLinkReturn</h3>
<pre class="programlisting">typedef enum {
GST_PAD_LINK_OK = 0,
GST_PAD_LINK_WRONG_HIERARCHY = -1,
GST_PAD_LINK_WAS_LINKED = -2,
GST_PAD_LINK_WRONG_DIRECTION = -3,
GST_PAD_LINK_NOFORMAT = -4,
GST_PAD_LINK_NOSCHED = -5,
GST_PAD_LINK_REFUSED = -6
} GstPadLinkReturn;
</pre>
<p>
Result values from gst_pad_link and friends.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-PAD-LINK-OK:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_OK</code></span></p></td>
<td>link succeeded
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-WRONG-HIERARCHY:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_WRONG_HIERARCHY</code></span></p></td>
<td>pads have no common grandparent
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-WAS-LINKED:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_WAS_LINKED</code></span></p></td>
<td>pad was already linked
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-WRONG-DIRECTION:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_WRONG_DIRECTION</code></span></p></td>
<td>pads have wrong direction
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-NOFORMAT:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_NOFORMAT</code></span></p></td>
<td>pads do not have common format
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-NOSCHED:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_NOSCHED</code></span></p></td>
<td>pads cannot cooperate in scheduling
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-REFUSED:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_REFUSED</code></span></p></td>
<td>refused for some reason
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-LINK-FAILED:CAPS"></a><h3>GST_PAD_LINK_FAILED()</h3>
<pre class="programlisting">#define GST_PAD_LINK_FAILED(ret) ((ret) &lt; GST_PAD_LINK_OK)
</pre>
<p>
Macro to test if the given <a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="type">GstPadLinkReturn</span></a> value indicates a failed
link step.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>ret</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="type">GstPadLinkReturn</span></a> value</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-LINK-SUCCESSFUL:CAPS"></a><h3>GST_PAD_LINK_SUCCESSFUL()</h3>
<pre class="programlisting">#define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) &gt;= GST_PAD_LINK_OK)
</pre>
<p>
Macro to test if the given <a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="type">GstPadLinkReturn</span></a> value indicates a successful
link step.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>ret</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="type">GstPadLinkReturn</span></a> value</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadLinkCheck"></a><h3>enum GstPadLinkCheck</h3>
<pre class="programlisting">typedef enum {
GST_PAD_LINK_CHECK_NOTHING = 0,
GST_PAD_LINK_CHECK_HIERARCHY = 1 &lt;&lt; 0,
GST_PAD_LINK_CHECK_TEMPLATE_CAPS = 1 &lt;&lt; 1,
GST_PAD_LINK_CHECK_CAPS = 1 &lt;&lt; 2,
GST_PAD_LINK_CHECK_DEFAULT = GST_PAD_LINK_CHECK_HIERARCHY | GST_PAD_LINK_CHECK_CAPS
} GstPadLinkCheck;
</pre>
<p>
The amount of checking to be done when linking pads. <em class="parameter"><code>GST_PAD_LINK_CHECK_CAPS</code></em>
and <em class="parameter"><code>GST_PAD_LINK_CHECK_TEMPLATE_CAPS</code></em> are mutually exclusive. If both are
specified, expensive but safe <em class="parameter"><code>GST_PAD_LINK_CHECK_CAPS</code></em> are performed.
</p>
<p>
</p>
<div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Warning</h3>
<p>
Only disable some of the checks if you are 100% certain you know the link
will not fail because of hierarchy/caps compatibility failures. If uncertain,
use the default checks (<a class="link" href="GstPad.html#GST-PAD-LINK-CHECK-DEFAULT:CAPS"><code class="literal">GST_PAD_LINK_CHECK_DEFAULT</code></a>) or the regular methods
for linking the pads.
</p>
</div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-PAD-LINK-CHECK-NOTHING:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_CHECK_NOTHING</code></span></p></td>
<td>Don't check hierarchy or caps compatibility.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-CHECK-HIERARCHY:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_CHECK_HIERARCHY</code></span></p></td>
<td>Check the pads have same parents/grandparents.
Could be omitted if it is already known that the two elements that own the
pads are in the same bin.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-CHECK-TEMPLATE-CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_CHECK_TEMPLATE_CAPS</code></span></p></td>
<td>Check if the pads are compatible by using
their template caps. This is much faster than <em class="parameter"><code>GST_PAD_LINK_CHECK_CAPS</code></em>, but
would be unsafe e.g. if one pad has <a class="link" href="gstreamer-GstCaps.html#GST-CAPS-ANY:CAPS" title="GST_CAPS_ANY"><code class="literal">GST_CAPS_ANY</code></a>.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-CHECK-CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_CHECK_CAPS</code></span></p></td>
<td>Check if the pads are compatible by comparing the
caps returned by <a class="link" href="GstPad.html#gst-pad-query-caps" title="gst_pad_query_caps ()"><code class="function">gst_pad_query_caps()</code></a>.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-LINK-CHECK-DEFAULT:CAPS"></a><span class="term"><code class="literal">GST_PAD_LINK_CHECK_DEFAULT</code></span></p></td>
<td>The default checks done when linking
pads (i.e. the ones used by <a class="link" href="GstPad.html#gst-pad-link" title="gst_pad_link ()"><code class="function">gst_pad_link()</code></a>).
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstFlowReturn"></a><h3>enum GstFlowReturn</h3>
<pre class="programlisting">typedef enum {
/* custom success starts here */
GST_FLOW_CUSTOM_SUCCESS_2 = 102,
GST_FLOW_CUSTOM_SUCCESS_1 = 101,
GST_FLOW_CUSTOM_SUCCESS = 100,
/* core predefined */
GST_FLOW_OK = 0,
/* expected failures */
GST_FLOW_NOT_LINKED = -1,
GST_FLOW_FLUSHING = -2,
/* error cases */
GST_FLOW_EOS = -3,
GST_FLOW_NOT_NEGOTIATED = -4,
GST_FLOW_ERROR = -5,
GST_FLOW_NOT_SUPPORTED = -6,
/* custom error starts here */
GST_FLOW_CUSTOM_ERROR = -100,
GST_FLOW_CUSTOM_ERROR_1 = -101,
GST_FLOW_CUSTOM_ERROR_2 = -102
} GstFlowReturn;
</pre>
<p>
The result of passing data to a pad.
</p>
<p>
Note that the custom return values should not be exposed outside of the
element scope.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-FLOW-CUSTOM-SUCCESS-2:CAPS"></a><span class="term"><code class="literal">GST_FLOW_CUSTOM_SUCCESS_2</code></span></p></td>
<td>Pre-defined custom success code.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-CUSTOM-SUCCESS-1:CAPS"></a><span class="term"><code class="literal">GST_FLOW_CUSTOM_SUCCESS_1</code></span></p></td>
<td>Pre-defined custom success code (define your
custom success code to this to avoid compiler
warnings).
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-CUSTOM-SUCCESS:CAPS"></a><span class="term"><code class="literal">GST_FLOW_CUSTOM_SUCCESS</code></span></p></td>
<td>Elements can use values starting from
this (and higher) to define custom success
codes.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-OK:CAPS"></a><span class="term"><code class="literal">GST_FLOW_OK</code></span></p></td>
<td>Data passing was ok.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-NOT-LINKED:CAPS"></a><span class="term"><code class="literal">GST_FLOW_NOT_LINKED</code></span></p></td>
<td>Pad is not linked.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-FLUSHING:CAPS"></a><span class="term"><code class="literal">GST_FLOW_FLUSHING</code></span></p></td>
<td>Pad is flushing.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-EOS:CAPS"></a><span class="term"><code class="literal">GST_FLOW_EOS</code></span></p></td>
<td>Pad is EOS.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-NOT-NEGOTIATED:CAPS"></a><span class="term"><code class="literal">GST_FLOW_NOT_NEGOTIATED</code></span></p></td>
<td>Pad is not negotiated.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-ERROR:CAPS"></a><span class="term"><code class="literal">GST_FLOW_ERROR</code></span></p></td>
<td>Some (fatal) error occured. Element generating
this error should post an error message with more
details.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-NOT-SUPPORTED:CAPS"></a><span class="term"><code class="literal">GST_FLOW_NOT_SUPPORTED</code></span></p></td>
<td>This operation is not supported.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-CUSTOM-ERROR:CAPS"></a><span class="term"><code class="literal">GST_FLOW_CUSTOM_ERROR</code></span></p></td>
<td>Elements can use values starting from
this (and lower) to define custom error codes.
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-CUSTOM-ERROR-1:CAPS"></a><span class="term"><code class="literal">GST_FLOW_CUSTOM_ERROR_1</code></span></p></td>
<td>Pre-defined custom error code (define your
custom error code to this to avoid compiler
warnings).
</td>
</tr>
<tr>
<td><p><a name="GST-FLOW-CUSTOM-ERROR-2:CAPS"></a><span class="term"><code class="literal">GST_FLOW_CUSTOM_ERROR_2</code></span></p></td>
<td>Pre-defined custom error code.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-flow-get-name"></a><h3>gst_flow_get_name ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_flow_get_name (<em class="parameter"><code><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> ret</code></em>);</pre>
<p>
Gets a string representing the given flow return.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ret</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> to get the name of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a static string with the name of the flow return.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-flow-to-quark"></a><h3>gst_flow_to_quark ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a> gst_flow_to_quark (<em class="parameter"><code><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> ret</code></em>);</pre>
<p>
Get the unique quark for the given GstFlowReturn.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ret</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> to get the quark of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the quark associated with the flow return or 0 if an
invalid return was specified.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadMode"></a><h3>enum GstPadMode</h3>
<pre class="programlisting">typedef enum {
GST_PAD_MODE_NONE,
GST_PAD_MODE_PUSH,
GST_PAD_MODE_PULL
} GstPadMode;
</pre>
<p>
The status of a GstPad. After activating a pad, which usually happens when the
parent element goes from READY to PAUSED, the GstPadMode defines if the
pad operates in push or pull mode.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-PAD-MODE-NONE:CAPS"></a><span class="term"><code class="literal">GST_PAD_MODE_NONE</code></span></p></td>
<td>Pad will not handle dataflow
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-MODE-PUSH:CAPS"></a><span class="term"><code class="literal">GST_PAD_MODE_PUSH</code></span></p></td>
<td>Pad handles dataflow in downstream push mode
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-MODE-PULL:CAPS"></a><span class="term"><code class="literal">GST_PAD_MODE_PULL</code></span></p></td>
<td>Pad handles dataflow in upstream pull mode
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-mode-get-name"></a><h3>gst_pad_mode_get_name ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_pad_mode_get_name (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadMode" title="enum GstPadMode"><span class="type">GstPadMode</span></a> mode</code></em>);</pre>
<p>
Return the name of a pad mode, for use in debug messages mostly.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>the pad mode</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>short mnemonic for pad mode <em class="parameter"><code>mode</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-name"></a><h3>gst_pad_get_name()</h3>
<pre class="programlisting">#define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
</pre>
<p>
Get a copy of the name of the pad. <a href="http://library.gnome.org/devel/glib/unstable/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> after usage.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the pad to get the name from</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-direction"></a><h3>gst_pad_get_direction ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="returnvalue">GstPadDirection</span></a> gst_pad_get_direction (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets the direction of the pad. The direction of the pad is
decided at construction time so this function does not take
the LOCK.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the direction of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> of the pad.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-parent"></a><h3>gst_pad_get_parent()</h3>
<pre class="programlisting">#define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
</pre>
<p>
Get the parent of <em class="parameter"><code>pad</code></em>. This function increases the refcount
of the parent object so you should <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a> it after usage.
Can return NULL if the pad did not have a parent.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the pad to get the parent of</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-parent-element"></a><h3>gst_pad_get_parent_element ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * gst_pad_get_parent_element (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets the parent of <em class="parameter"><code>pad</code></em>, cast to a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>. If a <em class="parameter"><code>pad</code></em> has no parent or
its parent is not an element, return NULL.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a pad</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the parent of the pad. The caller has a
reference on the parent, so unref when you're finished with it.
MT safe. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-get-pad-template"></a><h3>gst_pad_get_pad_template ()</h3>
<pre class="programlisting"><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * gst_pad_get_pad_template (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets the template for <em class="parameter"><code>pad</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> from which this pad was
instantiated, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if this pad has no template. Unref after
usage. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-link"></a><h3>gst_pad_link ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="returnvalue">GstPadLinkReturn</span></a> gst_pad_link (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *srcpad</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *sinkpad</code></em>);</pre>
<p>
Links the source pad and the sink pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>srcpad</code></em> :</span></p></td>
<td>the source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to link.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sinkpad</code></em> :</span></p></td>
<td>the sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to link.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A result code indicating if the connection worked or
what went wrong.
MT Safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-link-full"></a><h3>gst_pad_link_full ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="returnvalue">GstPadLinkReturn</span></a> gst_pad_link_full (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *srcpad</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *sinkpad</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 source pad and the sink pad.
</p>
<p>
This variant of <a class="link" href="GstPad.html#gst-pad-link" title="gst_pad_link ()"><span class="type">gst_pad_link</span></a> provides a more granular control on the
checks being done when linking. While providing some considerable speedups
the caller of this method must be aware that wrong usage of those flags
can cause severe issues. Refer to the documentation of <a class="link" href="GstPad.html#GstPadLinkCheck" title="enum GstPadLinkCheck"><span class="type">GstPadLinkCheck</span></a>
for more information.
</p>
<p>
MT Safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>srcpad</code></em> :</span></p></td>
<td>the source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to link.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sinkpad</code></em> :</span></p></td>
<td>the sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to link.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>the checks to validate when linking</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A result code indicating if the connection worked or
what went wrong.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-unlink"></a><h3>gst_pad_unlink ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_unlink (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *srcpad</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *sinkpad</code></em>);</pre>
<p>
Unlinks the source pad from the sink pad. Will emit the <a class="link" href="GstPad.html#GstPad-unlinked" title='The "unlinked" signal'><span class="type">"unlinked"</span></a>
signal on both pads.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>srcpad</code></em> :</span></p></td>
<td>the source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to unlink.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sinkpad</code></em> :</span></p></td>
<td>the sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to unlink.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pads were unlinked. This function returns FALSE if
the pads were not linked together.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-is-linked"></a><h3>gst_pad_is_linked ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_is_linked (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Checks if a <em class="parameter"><code>pad</code></em> is linked to another pad or not.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>pad to check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pad is linked, FALSE otherwise.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-can-link"></a><h3>gst_pad_can_link ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_can_link (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *srcpad</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *sinkpad</code></em>);</pre>
<p>
Checks if the source pad and the sink pad are compatible so they can be
linked.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>srcpad</code></em> :</span></p></td>
<td>the source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sinkpad</code></em> :</span></p></td>
<td>the sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pads can be linked.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-allowed-caps"></a><h3>gst_pad_get_allowed_caps ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_pad_get_allowed_caps (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets the capabilities of the allowed media types that can flow through
<em class="parameter"><code>pad</code></em> and its peer.
</p>
<p>
The allowed capabilities is calculated as the intersection of the results of
calling <a class="link" href="GstPad.html#gst-pad-query-caps" title="gst_pad_query_caps ()"><code class="function">gst_pad_query_caps()</code></a> on <em class="parameter"><code>pad</code></em> and its peer. The caller owns a reference
on the resulting caps.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the allowed <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> of the pad link. Unref the
caps when you no longer need it. This function returns NULL when <em class="parameter"><code>pad</code></em>
has no peer.
MT safe. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-get-current-caps"></a><h3>gst_pad_get_current_caps ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_pad_get_current_caps (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets the capabilities currently configured on <em class="parameter"><code>pad</code></em> with the last
<a class="link" href="gstreamer-GstEvent.html#GST-EVENT-CAPS"><span class="type">GST_EVENT_CAPS</span></a> event.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the current capabilities of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the current caps of the pad with incremented ref-count.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-pad-template-caps"></a><h3>gst_pad_get_pad_template_caps ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_pad_get_pad_template_caps (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets the capabilities for <em class="parameter"><code>pad</code></em>'s template.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the template capabilities from.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> of this pad template.
Unref after usage. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-get-peer"></a><h3>gst_pad_get_peer ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_pad_get_peer (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets the peer of <em class="parameter"><code>pad</code></em>. This function refs the peer pad so
you need to unref it after use.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the peer of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the peer <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>. Unref after usage.
MT safe. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-use-fixed-caps"></a><h3>gst_pad_use_fixed_caps ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_use_fixed_caps (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
A helper function you can use that sets the FIXED_CAPS flag
This way the default CAPS query will always return the negotiated caps
or in case the pad is not negotiated, the padtemplate caps.
</p>
<p>
The negotiated caps are the caps of the last CAPS event that passed on the
pad. Use this function on a pad that, once it negotiated to a CAPS, cannot
be renegotiated to something else.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the pad to use</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-has-current-caps"></a><h3>gst_pad_has_current_caps ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_has_current_caps (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Check if <em class="parameter"><code>pad</code></em> has caps set on it with a <a class="link" href="gstreamer-GstEvent.html#GST-EVENT-CAPS"><span class="type">GST_EVENT_CAPS</span></a> event.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE when <em class="parameter"><code>pad</code></em> has caps associated with it.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-sticky-event"></a><h3>gst_pad_get_sticky_event ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="returnvalue">GstEvent</span></a> * gst_pad_get_sticky_event (<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="gstreamer-GstEvent.html#GstEventType" title="enum GstEventType"><span class="type">GstEventType</span></a> event_type</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>);</pre>
<p>
Returns a new reference of the sticky event of type <em class="parameter"><code>event_type</code></em>
from the event.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the event from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event_type</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstEvent.html#GstEventType" title="enum GstEventType"><span class="type">GstEventType</span></a> that should be retrieved.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>idx</code></em> :</span></p></td>
<td>the index of the event</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> of type <em class="parameter"><code>event_type</code></em> or NULL when no
event of <em class="parameter"><code>event_type</code></em> was on <em class="parameter"><code>pad</code></em>. Unref after usage. <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>
<hr>
<div class="refsect2">
<a name="GstPadStickyEventsForeachFunction"></a><h3>GstPadStickyEventsForeachFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstPadStickyEventsForeachFunction)
(<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="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> **event</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Callback used by <a class="link" href="GstPad.html#gst-pad-sticky-events-foreach" title="gst_pad_sticky_events_foreach ()"><code class="function">gst_pad_sticky_events_foreach()</code></a>.
</p>
<p>
When this function returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, the next event will be
returned. When <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> is returned, <a class="link" href="GstPad.html#gst-pad-sticky-events-foreach" title="gst_pad_sticky_events_foreach ()"><code class="function">gst_pad_sticky_events_foreach()</code></a> will return.
</p>
<p>
When <em class="parameter"><code>event</code></em> is set to NULL, the item will be removed from the list of sticky events.
When <em class="parameter"><code>event</code></em> has been made writable, the new buffer reference can be assigned
to <em class="parameter"><code>event</code></em>. This function is responsible for unreffing the old event when
removing or modifying.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event</code></em> :</span></p></td>
<td>a sticky <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> to optional user data.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the iteration should continue</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-sticky-events-foreach"></a><h3>gst_pad_sticky_events_foreach ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_sticky_events_foreach (<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="GstPad.html#GstPadStickyEventsForeachFunction" title="GstPadStickyEventsForeachFunction ()"><span class="type">GstPadStickyEventsForeachFunction</span></a> foreach_func</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Iterates all sticky events on <em class="parameter"><code>pad</code></em> and calls <em class="parameter"><code>foreach_func</code></em> for every
event. If <em class="parameter"><code>foreach_func</code></em> returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> the iteration is immediately stopped.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> that should be used for iteration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>foreach_func</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadStickyEventsForeachFunction" title="GstPadStickyEventsForeachFunction ()"><span class="type">GstPadStickyEventsForeachFunction</span></a> that
should be called for every event. <span class="annotation">[<acronym title="The callback is valid only during the call to the method."><span class="acronym">scope call</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the optional user data. <span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-is-active"></a><h3>gst_pad_is_active ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_is_active (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Query if a pad is active
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pad is active.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadProbeReturn"></a><h3>enum GstPadProbeReturn</h3>
<pre class="programlisting">typedef enum {
GST_PAD_PROBE_DROP,
GST_PAD_PROBE_OK,
GST_PAD_PROBE_REMOVE,
GST_PAD_PROBE_PASS,
} GstPadProbeReturn;
</pre>
<p>
Different return values for the <a class="link" href="GstPad.html#GstPadProbeCallback" title="GstPadProbeCallback ()"><span class="type">GstPadProbeCallback</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-PAD-PROBE-DROP:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_DROP</code></span></p></td>
<td>drop data in data probes. For push mode this means that
the data item is not sent downstream. For pull mode, it means that the
data item is not passed upstream. In both cases, this result code
returns <a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to the caller.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-OK:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_OK</code></span></p></td>
<td>normal probe return value
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-REMOVE:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_REMOVE</code></span></p></td>
<td>remove probe
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-PASS:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_PASS</code></span></p></td>
<td>pass the data item in the block probe and block on
the next item
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadProbeType"></a><h3>enum GstPadProbeType</h3>
<pre class="programlisting">typedef enum {
GST_PAD_PROBE_TYPE_INVALID = 0,
/* flags to control blocking */
GST_PAD_PROBE_TYPE_IDLE = (1 &lt;&lt; 0),
GST_PAD_PROBE_TYPE_BLOCK = (1 &lt;&lt; 1),
/* flags to select datatypes */
GST_PAD_PROBE_TYPE_BUFFER = (1 &lt;&lt; 4),
GST_PAD_PROBE_TYPE_BUFFER_LIST = (1 &lt;&lt; 5),
GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM = (1 &lt;&lt; 6),
GST_PAD_PROBE_TYPE_EVENT_UPSTREAM = (1 &lt;&lt; 7),
GST_PAD_PROBE_TYPE_EVENT_FLUSH = (1 &lt;&lt; 8),
GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM = (1 &lt;&lt; 9),
GST_PAD_PROBE_TYPE_QUERY_UPSTREAM = (1 &lt;&lt; 10),
/* flags to select scheduling mode */
GST_PAD_PROBE_TYPE_PUSH = (1 &lt;&lt; 12),
GST_PAD_PROBE_TYPE_PULL = (1 &lt;&lt; 13),
/* flag combinations */
GST_PAD_PROBE_TYPE_BLOCKING = GST_PAD_PROBE_TYPE_IDLE | GST_PAD_PROBE_TYPE_BLOCK,
GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM = GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
GST_PAD_PROBE_TYPE_DATA_UPSTREAM = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM,
GST_PAD_PROBE_TYPE_DATA_BOTH = GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM | GST_PAD_PROBE_TYPE_DATA_UPSTREAM,
GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM = GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM,
GST_PAD_PROBE_TYPE_BLOCK_UPSTREAM = GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_UPSTREAM,
GST_PAD_PROBE_TYPE_EVENT_BOTH = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM | GST_PAD_PROBE_TYPE_EVENT_UPSTREAM,
GST_PAD_PROBE_TYPE_QUERY_BOTH = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM | GST_PAD_PROBE_TYPE_QUERY_UPSTREAM,
GST_PAD_PROBE_TYPE_ALL_BOTH = GST_PAD_PROBE_TYPE_DATA_BOTH | GST_PAD_PROBE_TYPE_QUERY_BOTH,
GST_PAD_PROBE_TYPE_SCHEDULING = GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_PULL
} GstPadProbeType;
</pre>
<p>
The different probing types that can occur. When either one of
<em class="parameter"><code>GST_PAD_PROBE_TYPE_IDLE</code></em> or <em class="parameter"><code>GST_PAD_PROBE_TYPE_BLOCK</code></em> is used, the probe will be a
blocking probe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-INVALID:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_INVALID</code></span></p></td>
<td>invalid probe type
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-IDLE:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_IDLE</code></span></p></td>
<td>probe idle pads and block
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-BLOCK:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_BLOCK</code></span></p></td>
<td>probe and block pads
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-BUFFER:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_BUFFER</code></span></p></td>
<td>probe buffers
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-BUFFER-LIST:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_BUFFER_LIST</code></span></p></td>
<td>probe buffer lists
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-EVENT-DOWNSTREAM:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM</code></span></p></td>
<td>probe downstream events
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-EVENT-UPSTREAM:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_EVENT_UPSTREAM</code></span></p></td>
<td>probe upstream events
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-EVENT-FLUSH:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_EVENT_FLUSH</code></span></p></td>
<td>probe flush events. This probe has to be
explicitly enabled and is not included in the
@<em class="parameter"><code>GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM</code></em> or
@<em class="parameter"><code>GST_PAD_PROBE_TYPE_EVENT_UPSTREAM</code></em> probe types.
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-QUERY-DOWNSTREAM:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM</code></span></p></td>
<td>probe downstream queries
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-QUERY-UPSTREAM:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_QUERY_UPSTREAM</code></span></p></td>
<td>probe upstream queries
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-PUSH:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_PUSH</code></span></p></td>
<td>probe push
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-PULL:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_PULL</code></span></p></td>
<td>probe pull
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-BLOCKING:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_BLOCKING</code></span></p></td>
<td>probe and block at the next opportunity, at data flow or when idle
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-DATA-DOWNSTREAM:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM</code></span></p></td>
<td>probe downstream data (buffers, buffer lists, and events)
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-DATA-UPSTREAM:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_DATA_UPSTREAM</code></span></p></td>
<td>probe upstream data (events)
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-DATA-BOTH:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_DATA_BOTH</code></span></p></td>
<td>probe upstream and downstream data (buffers, buffer lists, and events)
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-BLOCK-DOWNSTREAM:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM</code></span></p></td>
<td>probe and block downstream data (buffers, buffer lists, and events)
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-BLOCK-UPSTREAM:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_BLOCK_UPSTREAM</code></span></p></td>
<td>probe and block upstream data (events)
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-EVENT-BOTH:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_EVENT_BOTH</code></span></p></td>
<td>probe upstream and downstream events
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-QUERY-BOTH:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_QUERY_BOTH</code></span></p></td>
<td>probe upstream and downstream queries
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-ALL-BOTH:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_ALL_BOTH</code></span></p></td>
<td>probe upstream events and queries and downstream buffers, buffer lists, events and queries
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-PROBE-TYPE-SCHEDULING:CAPS"></a><span class="term"><code class="literal">GST_PAD_PROBE_TYPE_SCHEDULING</code></span></p></td>
<td>probe push and pull
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadProbeInfo"></a><h3>struct GstPadProbeInfo</h3>
<pre class="programlisting">struct GstPadProbeInfo {
GstPadProbeType type;
gulong id;
gpointer data;
guint64 offset;
guint size;
};
</pre>
<p>
Info passed in the <a class="link" href="GstPad.html#GstPadProbeCallback" title="GstPadProbeCallback ()"><span class="type">GstPadProbeCallback</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="GstPad.html#GstPadProbeType" title="enum GstPadProbeType"><span class="type">GstPadProbeType</span></a> <em class="structfield"><code><a name="GstPadProbeInfo.type"></a>type</code></em>;</span></p></td>
<td>the current probe type</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> <em class="structfield"><code><a name="GstPadProbeInfo.id"></a>id</code></em>;</span></p></td>
<td>the id of the probe</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> <em class="structfield"><code><a name="GstPadProbeInfo.data"></a>data</code></em>;</span></p></td>
<td>type specific data, check the <em class="parameter"><code>type</code></em> field to know the datatype.
This field can be NULL.</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint64</span> <em class="structfield"><code><a name="GstPadProbeInfo.offset"></a>offset</code></em>;</span></p></td>
<td>offset of pull probe, this field is valid when <em class="parameter"><code>type</code></em> contains
<a class="link" href="GstPad.html#GST-PAD-PROBE-TYPE-PULL:CAPS"><span class="type">GST_PAD_PROBE_TYPE_PULL</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstPadProbeInfo.size"></a>size</code></em>;</span></p></td>
<td>size of pull probe, this field is valid when <em class="parameter"><code>type</code></em> contains
<a class="link" href="GstPad.html#GST-PAD-PROBE-TYPE-PULL:CAPS"><span class="type">GST_PAD_PROBE_TYPE_PULL</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-TYPE:CAPS"></a><h3>GST_PAD_PROBE_INFO_TYPE()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_TYPE(d) ((d)-&gt;type)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-ID:CAPS"></a><h3>GST_PAD_PROBE_INFO_ID()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_ID(d) ((d)-&gt;id)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-DATA:CAPS"></a><h3>GST_PAD_PROBE_INFO_DATA()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_DATA(d) ((d)-&gt;data)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-BUFFER:CAPS"></a><h3>GST_PAD_PROBE_INFO_BUFFER()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_BUFFER(d) GST_BUFFER_CAST(GST_PAD_PROBE_INFO_DATA(d))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-BUFFER-LIST:CAPS"></a><h3>GST_PAD_PROBE_INFO_BUFFER_LIST()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_BUFFER_LIST(d) GST_BUFFER_LIST_CAST(GST_PAD_PROBE_INFO_DATA(d))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-EVENT:CAPS"></a><h3>GST_PAD_PROBE_INFO_EVENT()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_EVENT(d) GST_EVENT_CAST(GST_PAD_PROBE_INFO_DATA(d))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-QUERY:CAPS"></a><h3>GST_PAD_PROBE_INFO_QUERY()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_QUERY(d) GST_QUERY_CAST(GST_PAD_PROBE_INFO_DATA(d))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-probe-info-get-buffer"></a><h3>gst_pad_probe_info_get_buffer ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="returnvalue">GstBuffer</span></a> * gst_pad_probe_info_get_buffer (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> from the probe. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-probe-info-get-buffer-list"></a><h3>gst_pad_probe_info_get_buffer_list ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> * gst_pad_probe_info_get_buffer_list (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-probe-info-get-event"></a><h3>gst_pad_probe_info_get_event ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="returnvalue">GstEvent</span></a> * gst_pad_probe_info_get_event (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> from the probe. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-probe-info-get-query"></a><h3>gst_pad_probe_info_get_query ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="returnvalue">GstQuery</span></a> * gst_pad_probe_info_get_query (<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> from the probe. <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>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-OFFSET:CAPS"></a><h3>GST_PAD_PROBE_INFO_OFFSET()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_OFFSET(d) ((d)-&gt;offset)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-PROBE-INFO-SIZE:CAPS"></a><h3>GST_PAD_PROBE_INFO_SIZE()</h3>
<pre class="programlisting">#define GST_PAD_PROBE_INFO_SIZE(d) ((d)-&gt;size)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstPadProbeCallback"></a><h3>GstPadProbeCallback ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstPadProbeReturn" title="enum GstPadProbeReturn"><span class="returnvalue">GstPadProbeReturn</span></a> (*GstPadProbeCallback) (<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="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a> *info</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Callback used by <a class="link" href="GstPad.html#gst-pad-add-probe" title="gst_pad_add_probe ()"><code class="function">gst_pad_add_probe()</code></a>. Gets called to notify about the current
blocking type.
</p>
<p>
The callback is allowed to modify the data pointer in <em class="parameter"><code>info</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> that is blocked</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
<td><a class="link" href="GstPad.html#GstPadProbeInfo" title="struct GstPadProbeInfo"><span class="type">GstPadProbeInfo</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the gpointer to optional user data.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstPadProbeReturn" title="enum GstPadProbeReturn"><span class="type">GstPadProbeReturn</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-add-probe"></a><h3>gst_pad_add_probe ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a> gst_pad_add_probe (<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="GstPad.html#GstPadProbeType" title="enum GstPadProbeType"><span class="type">GstPadProbeType</span></a> mask</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadProbeCallback" title="GstPadProbeCallback ()"><span class="type">GstPadProbeCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_data</code></em>);</pre>
<p>
Be notified of different states of pads. The provided callback is called for
every state that matches <em class="parameter"><code>mask</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to add the probe to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mask</code></em> :</span></p></td>
<td>the probe mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>callback</code></em> :</span></p></td>
<td>
<a class="link" href="GstPad.html#GstPadProbeCallback" title="GstPadProbeCallback ()"><span class="type">GstPadProbeCallback</span></a> that will be called with notifications of
the pad state</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the callback. <span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy_data</code></em> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> for user_data</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>an id or 0 on error. The id can be used to remove the probe with
<a class="link" href="GstPad.html#gst-pad-remove-probe" title="gst_pad_remove_probe ()"><code class="function">gst_pad_remove_probe()</code></a>.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-remove-probe"></a><h3>gst_pad_remove_probe ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_remove_probe (<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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> id</code></em>);</pre>
<p>
Remove the probe with <em class="parameter"><code>id</code></em> from <em class="parameter"><code>pad</code></em>.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> with the probe</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>the probe id to remove</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-is-blocked"></a><h3>gst_pad_is_blocked ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_is_blocked (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Checks if the pad is blocked or not. This function returns the
last requested state of the pad. It is not certain that the pad
is actually blocking at this point (see <a class="link" href="GstPad.html#gst-pad-is-blocking" title="gst_pad_is_blocking ()"><code class="function">gst_pad_is_blocking()</code></a>).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pad is blocked.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-is-blocking"></a><h3>gst_pad_is_blocking ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_is_blocking (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Checks if the pad is blocking or not. This is a guaranteed state
of whether the pad is actually blocking on a <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> or a <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pad is blocking.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-offset"></a><h3>gst_pad_get_offset ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span> gst_pad_get_offset (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Get the offset applied to the running time of <em class="parameter"><code>pad</code></em>. <em class="parameter"><code>pad</code></em> has to be a source
pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the offset.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-offset"></a><h3>gst_pad_set_offset ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_offset (<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><span class="type">gint64</span> offset</code></em>);</pre>
<p>
Set the offset that will be applied to the running time of <em class="parameter"><code>pad</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>the offset</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-new"></a><h3>gst_pad_new ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_pad_new (<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> direction</code></em>);</pre>
<p>
Creates a new pad with the given name in the given direction.
If name is NULL, a guaranteed unique name (across all pads)
will be assigned.
This function makes a copy of the name so you can safely free the name.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the new pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>direction</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> of the pad.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, or NULL in case of an error.
MT safe. <span class="annotation">[transfer floating]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-new-from-template"></a><h3>gst_pad_new_from_template ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_pad_new_from_template (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>
Creates a new pad with the given name from the given template.
If name is NULL, a guaranteed unique name (across all pads)
will be assigned.
This function makes a copy of the name so you can safely free the name.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>the pad template to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the element</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, or NULL in case of an error. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-new-from-static-template"></a><h3>gst_pad_new_from_static_template ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_pad_new_from_static_template (<em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> *templ</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>
Creates a new pad with the given name from the given static template.
If name is NULL, a guaranteed unique name (across all pads)
will be assigned.
This function makes a copy of the name so you can safely free the name.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>the <a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the element</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, or NULL in case of an error. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-set-chain-function"></a><h3>gst_pad_set_chain_function()</h3>
<pre class="programlisting">#define gst_pad_set_chain_function(p,f) gst_pad_set_chain_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-chain-function-full" title="gst_pad_set_chain_function_full ()"><code class="function">gst_pad_set_chain_function_full()</code></a> with NULL for the user_data and
notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadChainFunction" title="GstPadChainFunction ()"><span class="type">GstPadChainFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-chain-function-full"></a><h3>gst_pad_set_chain_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_chain_function_full (<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="GstPad.html#GstPadChainFunction" title="GstPadChainFunction ()"><span class="type">GstPadChainFunction</span></a> chain</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given chain function for the pad. The chain function is called to
process a <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> input buffer. see <a class="link" href="GstPad.html#GstPadChainFunction" title="GstPadChainFunction ()"><span class="type">GstPadChainFunction</span></a> for more details.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>chain</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadChainFunction" title="GstPadChainFunction ()"><span class="type">GstPadChainFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>chain</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadChainFunction"></a><h3>GstPadChainFunction ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (*GstPadChainFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>
A function that will be called on sinkpads when chaining buffers.
The function typically processes the data contained in the buffer and
either consumes the data or passes it on to the internally linked pad(s).
</p>
<p>
The implementer of this function receives a refcount to <em class="parameter"><code>buffer</code></em> and should
<a class="link" href="gstreamer-GstBuffer.html#gst-buffer-unref" title="gst_buffer_unref ()"><code class="function">gst_buffer_unref()</code></a> when the buffer is no longer needed.
</p>
<p>
When a chain function detects an error in the data stream, it must post an
error on the bus and return an appropriate <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> that performed the chain.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>. If the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-PARENT:CAPS"><span class="type">GST_PAD_FLAG_NEED_PARENT</span></a> flag is set,
<em class="parameter"><code>parent</code></em> is guaranteed to be not-NULL and remain valid during the
execution of this function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> that is chained, not <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> for success</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-chain-list-function"></a><h3>gst_pad_set_chain_list_function()</h3>
<pre class="programlisting">#define gst_pad_set_chain_list_function(p,f) gst_pad_set_chain_list_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-chain-list-function-full" title="gst_pad_set_chain_list_function_full ()"><code class="function">gst_pad_set_chain_list_function_full()</code></a> with NULL for the user_data and
notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadChainListFunction" title="GstPadChainListFunction ()"><span class="type">GstPadChainListFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-chain-list-function-full"></a><h3>gst_pad_set_chain_list_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_chain_list_function_full
(<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="GstPad.html#GstPadChainListFunction" title="GstPadChainListFunction ()"><span class="type">GstPadChainListFunction</span></a> chainlist</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given chain list function for the pad. The chainlist function is
called to process a <a class="link" href="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> input buffer list. See
<a class="link" href="GstPad.html#GstPadChainListFunction" title="GstPadChainListFunction ()"><span class="type">GstPadChainListFunction</span></a> for more details.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>chainlist</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadChainListFunction" title="GstPadChainListFunction ()"><span class="type">GstPadChainListFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>chainlist</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadChainListFunction"></a><h3>GstPadChainListFunction ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (*GstPadChainListFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);</pre>
<p>
A function that will be called on sinkpads when chaining buffer lists.
The function typically processes the data contained in the buffer list and
either consumes the data or passes it on to the internally linked pad(s).
</p>
<p>
The implementer of this function receives a refcount to <em class="parameter"><code>list</code></em> and
should <a class="link" href="gstreamer-GstBufferList.html#gst-buffer-list-unref" title="gst_buffer_list_unref ()"><code class="function">gst_buffer_list_unref()</code></a> when the list is no longer needed.
</p>
<p>
When a chainlist function detects an error in the data stream, it must
post an error on the bus and return an appropriate <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> that performed the chain.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>. If the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-PARENT:CAPS"><span class="type">GST_PAD_FLAG_NEED_PARENT</span></a> flag is set,
<em class="parameter"><code>parent</code></em> is guaranteed to be not-NULL and remain valid during the
execution of this function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>list</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> that is chained, not <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> for success</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-range"></a><h3>gst_pad_get_range ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> gst_pad_get_range (<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><span class="type">guint64</span> offset</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> size</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);</pre>
<p>
When <em class="parameter"><code>pad</code></em> is flushing this function returns <a class="link" href="GstPad.html#GST-FLOW-FLUSHING:CAPS"><span class="type">GST_FLOW_FLUSHING</span></a>
immediately and <em class="parameter"><code>buffer</code></em> is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</p>
<p>
Calls the getrange function of <em class="parameter"><code>pad</code></em>, see <a class="link" href="GstPad.html#GstPadGetRangeFunction" title="GstPadGetRangeFunction ()"><span class="type">GstPadGetRangeFunction</span></a> for a
description of a getrange function. If <em class="parameter"><code>pad</code></em> has no getrange function
installed (see <a class="link" href="GstPad.html#gst-pad-set-getrange-function" title="gst_pad_set_getrange_function()"><code class="function">gst_pad_set_getrange_function()</code></a>) this function returns
<a class="link" href="GstPad.html#GST-FLOW-NOT-SUPPORTED:CAPS"><span class="type">GST_FLOW_NOT_SUPPORTED</span></a>.
</p>
<p>
If <em class="parameter"><code>buffer</code></em> points to a variable holding NULL, a valid new <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> will be
placed in <em class="parameter"><code>buffer</code></em> when this function returns <a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a>. The new buffer
must be freed with <a class="link" href="gstreamer-GstBuffer.html#gst-buffer-unref" title="gst_buffer_unref ()"><code class="function">gst_buffer_unref()</code></a> after usage.
</p>
<p>
When <em class="parameter"><code>buffer</code></em> points to a variable that points to a valid <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a>, the
buffer will be filled with the result data when this function returns
<a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a>. If the provided buffer is larger than <em class="parameter"><code>size</code></em>, only
<em class="parameter"><code>size</code></em> bytes will be filled in the result buffer and its size will be updated
accordingly.
</p>
<p>
Note that less than <em class="parameter"><code>size</code></em> bytes can be returned in <em class="parameter"><code>buffer</code></em> when, for example,
an EOS condition is near or when <em class="parameter"><code>buffer</code></em> is not large enough to hold <em class="parameter"><code>size</code></em>
bytes. The caller should check the result buffer size to get the result size.
</p>
<p>
When this function returns any other result value than <a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a>, <em class="parameter"><code>buffer</code></em>
will be unchanged.
</p>
<p>
This is a lowlevel function. Usualy <a class="link" href="GstPad.html#gst-pad-pull-range" title="gst_pad_pull_range ()"><code class="function">gst_pad_pull_range()</code></a> is used.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a src <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns <a class="link" href="GstPad.html#GST-FLOW-ERROR:CAPS"><span class="type">GST_FLOW_ERROR</span></a> if not.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>The start offset of the buffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The length of the buffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>a pointer to hold the <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a>,
returns <a class="link" href="GstPad.html#GST-FLOW-ERROR:CAPS"><span class="type">GST_FLOW_ERROR</span></a> if <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym> callee-allocates]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the pad.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-getrange-function"></a><h3>gst_pad_set_getrange_function()</h3>
<pre class="programlisting">#define gst_pad_set_getrange_function(p,f) gst_pad_set_getrange_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-getrange-function-full" title="gst_pad_set_getrange_function_full ()"><code class="function">gst_pad_set_getrange_function_full()</code></a> with NULL for the user_data and
notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadGetRangeFunction" title="GstPadGetRangeFunction ()"><span class="type">GstPadGetRangeFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-getrange-function-full"></a><h3>gst_pad_set_getrange_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_getrange_function_full (<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="GstPad.html#GstPadGetRangeFunction" title="GstPadGetRangeFunction ()"><span class="type">GstPadGetRangeFunction</span></a> get</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given getrange function for the pad. The getrange function is
called to produce a new <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> to start the processing pipeline. see
<a class="link" href="GstPad.html#GstPadGetRangeFunction" title="GstPadGetRangeFunction ()"><span class="type">GstPadGetRangeFunction</span></a> for a description of the getrange function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>get</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadGetRangeFunction" title="GstPadGetRangeFunction ()"><span class="type">GstPadGetRangeFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>get</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadGetRangeFunction"></a><h3>GstPadGetRangeFunction ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (*GstPadGetRangeFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><span class="type">guint64</span> offset</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> length</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);</pre>
<p>
This function will be called on source pads when a peer element
request a buffer at the specified <em class="parameter"><code>offset</code></em> and <em class="parameter"><code>length</code></em>. If this function
returns <a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a>, the result buffer will be stored in <em class="parameter"><code>buffer</code></em>. The
contents of <em class="parameter"><code>buffer</code></em> is invalid for any other return value.
</p>
<p>
This function is installed on a source pad with
<a class="link" href="GstPad.html#gst-pad-set-getrange-function" title="gst_pad_set_getrange_function()"><code class="function">gst_pad_set_getrange_function()</code></a> and can only be called on source pads after
they are successfully activated with <a class="link" href="GstPad.html#gst-pad-activate-mode" title="gst_pad_activate_mode ()"><code class="function">gst_pad_activate_mode()</code></a> with the
<a class="link" href="GstPad.html#GST-PAD-MODE-PULL:CAPS"><span class="type">GST_PAD_MODE_PULL</span></a>.
</p>
<p>
<em class="parameter"><code>offset</code></em> and <em class="parameter"><code>length</code></em> are always given in byte units. <em class="parameter"><code>offset</code></em> must normally be a value
between 0 and the length in bytes of the data available on <em class="parameter"><code>pad</code></em>. The
length (duration in bytes) can be retrieved with a <a class="link" href="gstreamer-GstQuery.html#GST-QUERY-DURATION:CAPS"><span class="type">GST_QUERY_DURATION</span></a> or with a
<a class="link" href="gstreamer-GstQuery.html#GST-QUERY-SEEKING:CAPS"><span class="type">GST_QUERY_SEEKING</span></a>.
</p>
<p>
Any <em class="parameter"><code>offset</code></em> larger or equal than the length will make the function return
<a class="link" href="GstPad.html#GST-FLOW-EOS:CAPS"><span class="type">GST_FLOW_EOS</span></a>, which corresponds to EOS. In this case <em class="parameter"><code>buffer</code></em> does not
contain a valid buffer.
</p>
<p>
The buffer size of <em class="parameter"><code>buffer</code></em> will only be smaller than <em class="parameter"><code>length</code></em> when <em class="parameter"><code>offset</code></em> is
near the end of the stream. In all other cases, the size of <em class="parameter"><code>buffer</code></em> must be
exactly the requested size.
</p>
<p>
It is allowed to call this function with a 0 <em class="parameter"><code>length</code></em> and valid <em class="parameter"><code>offset</code></em>, in
which case <em class="parameter"><code>buffer</code></em> will contain a 0-sized buffer and the function returns
<a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a>.
</p>
<p>
When this function is called with a -1 <em class="parameter"><code>offset</code></em>, the sequentially next buffer
of length <em class="parameter"><code>length</code></em> in the stream is returned.
</p>
<p>
When this function is called with a -1 <em class="parameter"><code>length</code></em>, a buffer with a default
optimal length is returned in <em class="parameter"><code>buffer</code></em>. The length might depend on the value
of <em class="parameter"><code>offset</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the src <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to perform the getrange on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>. If the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-PARENT:CAPS"><span class="type">GST_PAD_FLAG_NEED_PARENT</span></a> flag is set,
<em class="parameter"><code>parent</code></em> is guaranteed to be not-NULL and remain valid during the
execution of this function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>the offset of the range</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>the length of the range</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>a memory location to hold the result buffer, cannot be NULL.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> for success and a valid buffer in <em class="parameter"><code>buffer</code></em>. Any other
return value leaves <em class="parameter"><code>buffer</code></em> undefined.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-event-function"></a><h3>gst_pad_set_event_function()</h3>
<pre class="programlisting">#define gst_pad_set_event_function(p,f) gst_pad_set_event_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-event-function-full" title="gst_pad_set_event_function_full ()"><code class="function">gst_pad_set_event_function_full()</code></a> with NULL for the user_data and
notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> of either direction.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadEventFunction" title="GstPadEventFunction ()"><span class="type">GstPadEventFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-event-function-full"></a><h3>gst_pad_set_event_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_event_function_full (<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="GstPad.html#GstPadEventFunction" title="GstPadEventFunction ()"><span class="type">GstPadEventFunction</span></a> event</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given event handler for the pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> of either direction.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadEventFunction" title="GstPadEventFunction ()"><span class="type">GstPadEventFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>event</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadEventFunction"></a><h3>GstPadEventFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstPadEventFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);</pre>
<p>
Function signature to handle an event for the pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to handle the event.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>. If the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-PARENT:CAPS"><span class="type">GST_PAD_FLAG_NEED_PARENT</span></a> flag is set,
<em class="parameter"><code>parent</code></em> is guaranteed to be not-NULL and remain valid during the
execution of this function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> to handle.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pad could handle the event.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-link-function"></a><h3>gst_pad_set_link_function()</h3>
<pre class="programlisting">#define gst_pad_set_link_function(p,f) gst_pad_set_link_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-link-function-full" title="gst_pad_set_link_function_full ()"><code class="function">gst_pad_set_link_function_full()</code></a> with NULL
for the user_data and notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadLinkFunction" title="GstPadLinkFunction ()"><span class="type">GstPadLinkFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-link-function-full"></a><h3>gst_pad_set_link_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_link_function_full (<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="GstPad.html#GstPadLinkFunction" title="GstPadLinkFunction ()"><span class="type">GstPadLinkFunction</span></a> link</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given link function for the pad. It will be called when
the pad is linked with another pad.
</p>
<p>
The return value <a class="link" href="GstPad.html#GST-PAD-LINK-OK:CAPS"><span class="type">GST_PAD_LINK_OK</span></a> should be used when the connection can be
made.
</p>
<p>
The return value <a class="link" href="GstPad.html#GST-PAD-LINK-REFUSED:CAPS"><span class="type">GST_PAD_LINK_REFUSED</span></a> should be used when the connection
cannot be made for some reason.
</p>
<p>
If <em class="parameter"><code>link</code></em> is installed on a source pad, it should call the <a class="link" href="GstPad.html#GstPadLinkFunction" title="GstPadLinkFunction ()"><span class="type">GstPadLinkFunction</span></a>
of the peer sink pad, if present.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>link</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadLinkFunction" title="GstPadLinkFunction ()"><span class="type">GstPadLinkFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>link</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadLinkFunction"></a><h3>GstPadLinkFunction ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstPadLinkReturn" title="enum GstPadLinkReturn"><span class="returnvalue">GstPadLinkReturn</span></a> (*GstPadLinkFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *peer</code></em>);</pre>
<p>
Function signature to handle a new link on the pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> that is linked.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>. If the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-PARENT:CAPS"><span class="type">GST_PAD_FLAG_NEED_PARENT</span></a> flag is set,
<em class="parameter"><code>parent</code></em> is guaranteed to be not-NULL and remain valid during the
execution of this function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>peer</code></em> :</span></p></td>
<td>the peer <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> of the link</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result of the link with the specified peer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-unlink-function"></a><h3>gst_pad_set_unlink_function()</h3>
<pre class="programlisting">#define gst_pad_set_unlink_function(p,f) gst_pad_set_unlink_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-unlink-function-full" title="gst_pad_set_unlink_function_full ()"><code class="function">gst_pad_set_unlink_function_full()</code></a> with NULL
for the user_data and notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadUnlinkFunction" title="GstPadUnlinkFunction ()"><span class="type">GstPadUnlinkFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-unlink-function-full"></a><h3>gst_pad_set_unlink_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_unlink_function_full (<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="GstPad.html#GstPadUnlinkFunction" title="GstPadUnlinkFunction ()"><span class="type">GstPadUnlinkFunction</span></a> unlink</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given unlink function for the pad. It will be called
when the pad is unlinked.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>unlink</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadUnlinkFunction" title="GstPadUnlinkFunction ()"><span class="type">GstPadUnlinkFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>unlink</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadUnlinkFunction"></a><h3>GstPadUnlinkFunction ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GstPadUnlinkFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);</pre>
<p>
Function signature to handle a unlinking the pad prom its peer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> that is linked.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>. If the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-PARENT:CAPS"><span class="type">GST_PAD_FLAG_NEED_PARENT</span></a> flag is set,
<em class="parameter"><code>parent</code></em> is guaranteed to be not-NULL and remain valid during the
execution of this function.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-proxy-query-caps"></a><h3>gst_pad_proxy_query_caps ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_proxy_query_caps (<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="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-query-caps" title="gst_pad_query_caps ()"><code class="function">gst_pad_query_caps()</code></a> for all internally linked pads fof <em class="parameter"><code>pad</code></em> and returns
the intersection of the results.
</p>
<p>
This function is useful as a default caps query function for an element
that can handle any stream format, but requires all its pads to have
the same caps. Two such elements are tee and adder.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to proxy.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>a CAPS <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if <em class="parameter"><code>query</code></em> could be executed</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-proxy-query-accept-caps"></a><h3>gst_pad_proxy_query_accept_caps ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_proxy_query_accept_caps (<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="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>
Calls <code class="function">gst_pad_accept_caps()</code> for all internally linked pads of <em class="parameter"><code>pad</code></em> and
returns the intersection of the results.
</p>
<p>
This function is useful as a default accept caps query function for an element
that can handle any stream format, but requires caps that are acceptable for
all oposite pads.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to proxy.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>an ACCEPT_CAPS <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if <em class="parameter"><code>query</code></em> could be executed</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-activate-function"></a><h3>gst_pad_set_activate_function()</h3>
<pre class="programlisting">#define gst_pad_set_activate_function(p,f) gst_pad_set_activate_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-activate-function-full" title="gst_pad_set_activate_function_full ()"><code class="function">gst_pad_set_activate_function_full()</code></a> with NULL for the user_data and
notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadActivateFunction" title="GstPadActivateFunction ()"><span class="type">GstPadActivateFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-activate-function-full"></a><h3>gst_pad_set_activate_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_activate_function_full (<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="GstPad.html#GstPadActivateFunction" title="GstPadActivateFunction ()"><span class="type">GstPadActivateFunction</span></a> activate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given activate function for <em class="parameter"><code>pad</code></em>. The activate function will
dispatch to <a class="link" href="GstPad.html#gst-pad-activate-mode" title="gst_pad_activate_mode ()"><code class="function">gst_pad_activate_mode()</code></a> to perform the actual activation.
Only makes sense to set on sink pads.
</p>
<p>
Call this function if your sink pad can start a pull-based task.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>activate</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadActivateFunction" title="GstPadActivateFunction ()"><span class="type">GstPadActivateFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>activate</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadActivateFunction"></a><h3>GstPadActivateFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstPadActivateFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);</pre>
<p>
This function is called when the pad is activated during the element
READY to PAUSED state change. By default this function will call the
activate function that puts the pad in push mode but elements can
override this function to activate the pad in pull mode if they wish.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pad could be activated.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-activatemode-function"></a><h3>gst_pad_set_activatemode_function()</h3>
<pre class="programlisting">#define gst_pad_set_activatemode_function(p,f) gst_pad_set_activatemode_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-activatemode-function-full" title="gst_pad_set_activatemode_function_full ()"><code class="function">gst_pad_set_activatemode_function_full()</code></a> with NULL for the user_data and
notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadActivateModeFunction" title="GstPadActivateModeFunction ()"><span class="type">GstPadActivateModeFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-activatemode-function-full"></a><h3>gst_pad_set_activatemode_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_activatemode_function_full
(<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="GstPad.html#GstPadActivateModeFunction" title="GstPadActivateModeFunction ()"><span class="type">GstPadActivateModeFunction</span></a> activatemode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given activate_mode function for the pad. An activate_mode function
prepares the element for data passing.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>activatemode</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadActivateModeFunction" title="GstPadActivateModeFunction ()"><span class="type">GstPadActivateModeFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>activatemode</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadActivateModeFunction"></a><h3>GstPadActivateModeFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstPadActivateModeFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadMode" title="enum GstPadMode"><span class="type">GstPadMode</span></a> mode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);</pre>
<p>
The prototype of the push and pull activate functions.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>the requested activation mode of <em class="parameter"><code>pad</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>active</code></em> :</span></p></td>
<td>activate or deactivate the pad.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pad could be activated or deactivated.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-needs-reconfigure"></a><h3>gst_pad_needs_reconfigure ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_needs_reconfigure (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Check the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-RECONFIGURE:CAPS"><span class="type">GST_PAD_FLAG_NEED_RECONFIGURE</span></a> flag on <em class="parameter"><code>pad</code></em> and return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>
if the flag was set.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> is the GST_PAD_FLAG_NEED_RECONFIGURE flag is set on <em class="parameter"><code>pad</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-check-reconfigure"></a><h3>gst_pad_check_reconfigure ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_check_reconfigure (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Check and clear the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-RECONFIGURE:CAPS"><span class="type">GST_PAD_FLAG_NEED_RECONFIGURE</span></a> flag on <em class="parameter"><code>pad</code></em> and return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>
if the flag was set.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> is the GST_PAD_FLAG_NEED_RECONFIGURE flag was set on <em class="parameter"><code>pad</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-mark-reconfigure"></a><h3>gst_pad_mark_reconfigure ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_mark_reconfigure (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Mark a pad for needing reconfiguration. The next call to
<a class="link" href="GstPad.html#gst-pad-check-reconfigure" title="gst_pad_check_reconfigure ()"><code class="function">gst_pad_check_reconfigure()</code></a> will return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> after this call.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to mark</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-push"></a><h3>gst_pad_push ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> gst_pad_push (<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="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>
Pushes a buffer to the peer of <em class="parameter"><code>pad</code></em>.
</p>
<p>
This function will call installed block probes before triggering any
installed data probes.
</p>
<p>
The function proceeds calling <a class="link" href="GstPad.html#gst-pad-chain" title="gst_pad_chain ()"><code class="function">gst_pad_chain()</code></a> on the peer pad and returns
the value from that function. If <em class="parameter"><code>pad</code></em> has no peer, <a class="link" href="GstPad.html#GST-FLOW-NOT-LINKED:CAPS"><span class="type">GST_FLOW_NOT_LINKED</span></a> will
be returned.
</p>
<p>
In all cases, success or failure, the caller loses its reference to <em class="parameter"><code>buffer</code></em>
after calling this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns <a class="link" href="GstPad.html#GST-FLOW-ERROR:CAPS"><span class="type">GST_FLOW_ERROR</span></a> if not.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> to push returns GST_FLOW_ERROR
if not. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the peer pad.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-push-event"></a><h3>gst_pad_push_event ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_push_event (<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="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);</pre>
<p>
Sends the event to the peer of the given pad. This function is
mainly used by elements to send events to their peer
elements.
</p>
<p>
This function takes owership of the provided event so you should
<a class="link" href="gstreamer-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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to push the event to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> to send to the pad. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the event was handled.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-push-list"></a><h3>gst_pad_push_list ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> gst_pad_push_list (<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="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);</pre>
<p>
Pushes a buffer list to the peer of <em class="parameter"><code>pad</code></em>.
</p>
<p>
This function will call installed block probes before triggering any
installed data probes.
</p>
<p>
The function proceeds calling the chain function on the peer pad and returns
the value from that function. If <em class="parameter"><code>pad</code></em> has no peer, <a class="link" href="GstPad.html#GST-FLOW-NOT-LINKED:CAPS"><span class="type">GST_FLOW_NOT_LINKED</span></a> will
be returned. If the peer pad does not have any installed chainlist function
every group buffer of the list will be merged into a normal <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> and
chained via <a class="link" href="GstPad.html#gst-pad-chain" title="gst_pad_chain ()"><code class="function">gst_pad_chain()</code></a>.
</p>
<p>
In all cases, success or failure, the caller loses its reference to <em class="parameter"><code>list</code></em>
after calling this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns <a class="link" href="GstPad.html#GST-FLOW-ERROR:CAPS"><span class="type">GST_FLOW_ERROR</span></a> if not.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>list</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> to push returns GST_FLOW_ERROR
if not. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the peer pad.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-pull-range"></a><h3>gst_pad_pull_range ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> gst_pad_pull_range (<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><span class="type">guint64</span> offset</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> size</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);</pre>
<p>
Pulls a <em class="parameter"><code>buffer</code></em> from the peer pad or fills up a provided buffer.
</p>
<p>
This function will first trigger the pad block signal if it was
installed.
</p>
<p>
When <em class="parameter"><code>pad</code></em> is not linked <a class="link" href="GstPad.html#GST-FLOW-NOT-LINKED:CAPS"><span class="type">GST_FLOW_NOT_LINKED</span></a> is returned else this
function returns the result of <a class="link" href="GstPad.html#gst-pad-get-range" title="gst_pad_get_range ()"><code class="function">gst_pad_get_range()</code></a> on the peer pad.
See <a class="link" href="GstPad.html#gst-pad-get-range" title="gst_pad_get_range ()"><code class="function">gst_pad_get_range()</code></a> for a list of return values and for the
semantics of the arguments of this function.
</p>
<p>
If <em class="parameter"><code>buffer</code></em> points to a variable holding NULL, a valid new <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> will be
placed in <em class="parameter"><code>buffer</code></em> when this function returns <a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a>. The new buffer
must be freed with <a class="link" href="gstreamer-GstBuffer.html#gst-buffer-unref" title="gst_buffer_unref ()"><code class="function">gst_buffer_unref()</code></a> after usage. When this function
returns any other result value, <em class="parameter"><code>buffer</code></em> will still point to NULL.
</p>
<p>
When <em class="parameter"><code>buffer</code></em> points to a variable that points to a valid <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a>, the
buffer will be filled with the result data when this function returns
<a class="link" href="GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a>. When this function returns any other result value,
<em class="parameter"><code>buffer</code></em> will be unchanged. If the provided buffer is larger than <em class="parameter"><code>size</code></em>, only
<em class="parameter"><code>size</code></em> bytes will be filled in the result buffer and its size will be updated
accordingly.
</p>
<p>
Note that less than <em class="parameter"><code>size</code></em> bytes can be returned in <em class="parameter"><code>buffer</code></em> when, for example,
an EOS condition is near or when <em class="parameter"><code>buffer</code></em> is not large enough to hold <em class="parameter"><code>size</code></em>
bytes. The caller should check the result buffer size to get the result size.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns GST_FLOW_ERROR if not.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>The start offset of the buffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The length of the buffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>a pointer to hold the <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a>, returns
GST_FLOW_ERROR if <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym> callee-allocates]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the peer pad.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-activate-mode"></a><h3>gst_pad_activate_mode ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_activate_mode (<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="GstPad.html#GstPadMode" title="enum GstPadMode"><span class="type">GstPadMode</span></a> mode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);</pre>
<p>
Activates or deactivates the given pad in <em class="parameter"><code>mode</code></em> via dispatching to the
pad's activatemodefunc. For use from within pad activation functions only.
</p>
<p>
If you don't know what this is, you probably don't want to call it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to activate or deactivate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>the requested activation mode</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>active</code></em> :</span></p></td>
<td>whether or not the pad should be active.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the operation was successful.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-send-event"></a><h3>gst_pad_send_event ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_send_event (<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="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);</pre>
<p>
Sends the event to the pad. This function can be used
by applications to send events in the pipeline.
</p>
<p>
If <em class="parameter"><code>pad</code></em> is a source pad, <em class="parameter"><code>event</code></em> should be an upstream event. If <em class="parameter"><code>pad</code></em> is a
sink pad, <em class="parameter"><code>event</code></em> should be a downstream event. For example, you would not
send a <a class="link" href="gstreamer-GstEvent.html#GST-EVENT-EOS:CAPS"><span class="type">GST_EVENT_EOS</span></a> on a src pad; EOS events only propagate downstream.
Furthermore, some downstream events have to be serialized with data flow,
like EOS, while some can travel out-of-band, like <a class="link" href="gstreamer-GstEvent.html#GST-EVENT-FLUSH-START:CAPS"><span class="type">GST_EVENT_FLUSH_START</span></a>. If
the event needs to be serialized with data flow, this function will take the
pad's stream lock while calling its event function.
</p>
<p>
To find out whether an event type is upstream, downstream, or downstream and
serialized, see <a class="link" href="gstreamer-GstEvent.html#GstEventTypeFlags" title="enum GstEventTypeFlags"><span class="type">GstEventTypeFlags</span></a>, <a class="link" href="gstreamer-GstEvent.html#gst-event-type-get-flags" title="gst_event_type_get_flags ()"><code class="function">gst_event_type_get_flags()</code></a>,
<a class="link" href="gstreamer-GstEvent.html#GST-EVENT-IS-UPSTREAM:CAPS" title="GST_EVENT_IS_UPSTREAM()"><span class="type">GST_EVENT_IS_UPSTREAM</span></a>, <a class="link" href="gstreamer-GstEvent.html#GST-EVENT-IS-DOWNSTREAM:CAPS" title="GST_EVENT_IS_DOWNSTREAM()"><span class="type">GST_EVENT_IS_DOWNSTREAM</span></a>, and
<a class="link" href="gstreamer-GstEvent.html#GST-EVENT-IS-SERIALIZED:CAPS" title="GST_EVENT_IS_SERIALIZED()"><span class="type">GST_EVENT_IS_SERIALIZED</span></a>. Note that in practice that an application or
plugin doesn't need to bother itself with this information; the core handles
all necessary locks and checks.
</p>
<p>
This function takes owership of the provided event so you should
<a class="link" href="gstreamer-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>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to send the event to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> to send to the pad. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the event was handled.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-event-default"></a><h3>gst_pad_event_default ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_event_default (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);</pre>
<p>
Invokes the default event handler for the given pad.
</p>
<p>
The EOS event will pause the task associated with <em class="parameter"><code>pad</code></em> before it is forwarded
to all internally linked pads,
</p>
<p>
The the event is sent to all pads internally linked to <em class="parameter"><code>pad</code></em>. This function
takes ownership of <em class="parameter"><code>event</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to call the default event handler on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em> or NULL</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> to handle. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the event was sent successfully.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-query"></a><h3>gst_pad_query ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_query (<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="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>
Dispatches a query to a pad. The query should have been allocated by the
caller via one of the type-specific allocation functions. The element that
the pad belongs to is responsible for filling the query with an appropriate
response, which should then be parsed with a type-specific query parsing
function.
</p>
<p>
Again, the caller is responsible for both the allocation and deallocation of
the query structure.
</p>
<p>
Please also note that some queries might need a running pipeline to work.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to invoke the default query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> to perform. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-peer-query"></a><h3>gst_pad_peer_query ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_peer_query (<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="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>
Performs <a class="link" href="GstPad.html#gst-pad-query" title="gst_pad_query ()"><code class="function">gst_pad_query()</code></a> on the peer of <em class="parameter"><code>pad</code></em>.
</p>
<p>
The caller is responsible for both the allocation and deallocation of
the query structure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to invoke the peer query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> to perform. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed. This function returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>
if <em class="parameter"><code>pad</code></em> has no peer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-query-default"></a><h3>gst_pad_query_default ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_query_default (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>
Invokes the default query handler for the given pad.
The query is sent to all pads internally linked to <em class="parameter"><code>pad</code></em>. Note that
if there are many possible sink pads that are internally linked to
<em class="parameter"><code>pad</code></em>, only one will be sent the query.
Multi-sinkpad elements should implement custom query handlers.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to call the default query handler on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em> or NULL</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> to handle. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query was performed successfully.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-query-position"></a><h3>gst_pad_query_position ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_query_position (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *cur</code></em>);</pre>
<p>
Queries a pad for the stream position.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to invoke the position query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> requested</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cur</code></em> :</span></p></td>
<td>A location in which to store the current position, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-query-duration"></a><h3>gst_pad_query_duration ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_query_duration (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *duration</code></em>);</pre>
<p>
Queries a pad for the total stream duration.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to invoke the duration query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> requested</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>duration</code></em> :</span></p></td>
<td>a location in which to store the total
duration, or NULL. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-query-convert"></a><h3>gst_pad_query_convert ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_query_convert (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> src_format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> 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><span class="type">gint64</span> *dest_val</code></em>);</pre>
<p>
Queries a pad 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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to invoke the convert query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_format</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to convert from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_val</code></em> :</span></p></td>
<td>a value to convert.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to convert to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_val</code></em> :</span></p></td>
<td>a pointer to the result. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-query-accept-caps"></a><h3>gst_pad_query_accept_caps ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_query_accept_caps (<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="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Check if the given pad accepts the caps.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to check</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> to check on the pad</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pad can accept the caps.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-query-caps"></a><h3>gst_pad_query_caps ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_pad_query_caps (<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="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);</pre>
<p>
Gets the capabilities this pad can produce or consume.
Note that this method doesn't necessarily return the caps set by
<code class="function">gst_pad_set_caps()</code> - use <a class="link" href="GstPad.html#gst-pad-get-current-caps" title="gst_pad_get_current_caps ()"><code class="function">gst_pad_get_current_caps()</code></a> for that instead.
gst_pad_query_caps returns all possible caps a pad can operate with, using
the pad's CAPS query function, If the query fails, this function will return
<em class="parameter"><code>filter</code></em>, if not <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a>, otherwise ANY.
</p>
<p>
When called on sinkpads <em class="parameter"><code>filter</code></em> contains the caps that
upstream could produce in the order preferred by upstream. When
called on srcpads <em class="parameter"><code>filter</code></em> contains the caps accepted by
downstream in the preffered order. <em class="parameter"><code>filter</code></em> might be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> but
if it is not <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> the returned caps will be a subset of <em class="parameter"><code>filter</code></em>.
</p>
<p>
Note that this function does not return writable <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a>, use
<a class="link" href="gstreamer-GstCaps.html#gst-caps-make-writable" title="gst_caps_make_writable()"><code class="function">gst_caps_make_writable()</code></a> before modifying the caps.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the capabilities of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filter</code></em> :</span></p></td>
<td>suggested <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a>, or NULL. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the caps of the pad with incremented ref-count. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-peer-query-position"></a><h3>gst_pad_peer_query_position ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_peer_query_position (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *cur</code></em>);</pre>
<p>
Queries the peer of a given sink pad for the stream position.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> on whose peer to invoke the position query on.
Must be a sink pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> requested</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cur</code></em> :</span></p></td>
<td>a location in which to store the current
position, or NULL. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-peer-query-duration"></a><h3>gst_pad_peer_query_duration ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_peer_query_duration (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *duration</code></em>);</pre>
<p>
Queries the peer pad of a given sink pad for the total stream duration.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> on whose peer pad to invoke the duration query on.
Must be a sink pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> requested</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>duration</code></em> :</span></p></td>
<td>a location in which to store the total
duration, or NULL. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-peer-query-convert"></a><h3>gst_pad_peer_query_convert ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_peer_query_convert (<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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> src_format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> 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><span class="type">gint64</span> *dest_val</code></em>);</pre>
<p>
Queries the peer pad of a given sink pad 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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, on whose peer pad to invoke the convert query on.
Must be a sink pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_format</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to convert from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_val</code></em> :</span></p></td>
<td>a value to convert.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to convert to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_val</code></em> :</span></p></td>
<td>a pointer to the result. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-peer-query-accept-caps"></a><h3>gst_pad_peer_query_accept_caps ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_peer_query_accept_caps (<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="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Check if the peer of <em class="parameter"><code>pad</code></em> accepts <em class="parameter"><code>caps</code></em>. If <em class="parameter"><code>pad</code></em> has no peer, this function
returns TRUE.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to check the peer of</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> to check on the pad</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the peer of <em class="parameter"><code>pad</code></em> can accept the caps or <em class="parameter"><code>pad</code></em> has no peer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-peer-query-caps"></a><h3>gst_pad_peer_query_caps ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_pad_peer_query_caps (<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="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);</pre>
<p>
Gets the capabilities of the peer connected to this pad. Similar to
<a class="link" href="GstPad.html#gst-pad-query-caps" title="gst_pad_query_caps ()"><code class="function">gst_pad_query_caps()</code></a>.
</p>
<p>
When called on srcpads <em class="parameter"><code>filter</code></em> contains the caps that
upstream could produce in the order preferred by upstream. When
called on sinkpads <em class="parameter"><code>filter</code></em> contains the caps accepted by
downstream in the preffered order. <em class="parameter"><code>filter</code></em> might be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> but
if it is not <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> the returned caps will be a subset of <em class="parameter"><code>filter</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the capabilities of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filter</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> filter, or NULL. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the caps of the peer pad with incremented ref-count. When there is
no peer pad, this function returns <em class="parameter"><code>filter</code></em> or, when <em class="parameter"><code>filter</code></em> is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, ANY
caps.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-query-function"></a><h3>gst_pad_set_query_function()</h3>
<pre class="programlisting">#define gst_pad_set_query_function(p,f) gst_pad_set_query_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-query-function-full" title="gst_pad_set_query_function_full ()"><code class="function">gst_pad_set_query_function_full()</code></a> with NULL for the user_data and
notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> of either direction.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadQueryFunction" title="GstPadQueryFunction ()"><span class="type">GstPadQueryFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-query-function-full"></a><h3>gst_pad_set_query_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_query_function_full (<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="GstPad.html#GstPadQueryFunction" title="GstPadQueryFunction ()"><span class="type">GstPadQueryFunction</span></a> query</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Set the given query function for the pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> of either direction.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadQueryFunction" title="GstPadQueryFunction ()"><span class="type">GstPadQueryFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>query</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadQueryFunction"></a><h3>GstPadQueryFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstPadQueryFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>
The signature of the query function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to query.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>. If the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-PARENT:CAPS"><span class="type">GST_PAD_FLAG_NEED_PARENT</span></a> flag is set,
<em class="parameter"><code>parent</code></em> is guaranteed to be not-NULL and remain valid during the
execution of this function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> object to execute</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-iterate-internal-links-function"></a><h3>gst_pad_set_iterate_internal_links_function()</h3>
<pre class="programlisting">#define gst_pad_set_iterate_internal_links_function(p,f) gst_pad_set_iterate_internal_links_function_full((p),(f),NULL,NULL)
</pre>
<p>
Calls <a class="link" href="GstPad.html#gst-pad-set-iterate-internal-links-function-full" title="gst_pad_set_iterate_internal_links_function_full ()"><code class="function">gst_pad_set_iterate_internal_links_function_full()</code></a> with NULL
for the user_data and notify.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>p</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> of either direction.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>f</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadIterIntLinkFunction" title="GstPadIterIntLinkFunction ()"><span class="type">GstPadIterIntLinkFunction</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-iterate-internal-links-function-full"></a><h3>gst_pad_set_iterate_internal_links_function_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_iterate_internal_links_function_full
(<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="GstPad.html#GstPadIterIntLinkFunction" title="GstPadIterIntLinkFunction ()"><span class="type">GstPadIterIntLinkFunction</span></a> iterintlink</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Sets the given internal link iterator function for the pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> of either direction.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iterintlink</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadIterIntLinkFunction" title="GstPadIterIntLinkFunction ()"><span class="type">GstPadIterIntLinkFunction</span></a> to set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user_data passed to <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>notify called when <em class="parameter"><code>iterintlink</code></em> will not be used anymore.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadIterIntLinkFunction"></a><h3>GstPadIterIntLinkFunction ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * (*GstPadIterIntLinkFunction) (<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);</pre>
<p>
The signature of the internal pad link iterator function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>The <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to query.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em>. If the <a class="link" href="GstPad.html#GST-PAD-FLAG-NEED-PARENT:CAPS"><span class="type">GST_PAD_FLAG_NEED_PARENT</span></a> flag is set,
<em class="parameter"><code>parent</code></em> is guaranteed to be not-NULL and remain valid during the
execution of this function.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> that will iterate over all pads that are
linked to the given pad on the inside of the parent element.
the caller must call <a class="link" href="gstreamer-GstIterator.html#gst-iterator-free" title="gst_iterator_free ()"><code class="function">gst_iterator_free()</code></a> after usage.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-iterate-internal-links"></a><h3>gst_pad_iterate_internal_links ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_pad_iterate_internal_links (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets an iterator for the pads to which the given pad is linked to inside
of the parent element.
</p>
<p>
Each <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> element yielded by the iterator will have its refcount increased,
so unref after use.
</p>
<p>
Free-function: gst_iterator_free
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the GstPad to get the internal links of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <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> or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> when the
pad does not have an iterator function configured. Use
<a class="link" href="gstreamer-GstIterator.html#gst-iterator-free" title="gst_iterator_free ()"><code class="function">gst_iterator_free()</code></a> after usage. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-iterate-internal-links-default"></a><h3>gst_pad_iterate_internal_links_default ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_pad_iterate_internal_links_default
(<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="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);</pre>
<p>
Iterate the list of pads to which the given pad is linked to inside of
the parent element.
This is the default handler, and thus returns an iterator of all of the
pads inside the parent element with opposite direction.
</p>
<p>
The caller must free this iterator after use with <a class="link" href="gstreamer-GstIterator.html#gst-iterator-free" title="gst_iterator_free ()"><code class="function">gst_iterator_free()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the internal links of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the parent of <em class="parameter"><code>pad</code></em> or NULL</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <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>, or NULL if <em class="parameter"><code>pad</code></em> has no parent. Unref each
returned pad with <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-element-private"></a><h3>gst_pad_set_element_private ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_pad_set_element_private (<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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> priv</code></em>);</pre>
<p>
Set the given private data gpointer on the pad.
This function can only be used by the element that owns the pad.
No locking is performed in this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to set the private data of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>priv</code></em> :</span></p></td>
<td>The private data to attach to the pad.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-get-element-private"></a><h3>gst_pad_get_element_private ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a> gst_pad_get_element_private (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Gets the private data of a pad.
No locking is performed in this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the private data of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> to the private data. <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>
<hr>
<div class="refsect2">
<a name="gst-pad-create-stream-id"></a><h3>gst_pad_create_stream_id ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_pad_create_stream_id (<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="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *parent</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *stream_id</code></em>);</pre>
<p>
Creates a stream-id for the source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> <em class="parameter"><code>pad</code></em> by combining the
upstream information with the optional <em class="parameter"><code>stream_id</code></em> of the stream
of <em class="parameter"><code>pad</code></em>. <em class="parameter"><code>pad</code></em> must have a parent <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> and which must have zero
or one sinkpad. <em class="parameter"><code>stream_id</code></em> can only be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the parent element
of <em class="parameter"><code>pad</code></em> has only a single source pad.
</p>
<p>
This function generates an unique stream-id by getting the upstream
stream-start event stream ID and appending <em class="parameter"><code>stream_id</code></em> to it. If the
element has no sinkpad it will generate an upstream stream-id by
doing an URI query on the element and in the worst case just uses
a random number. Source elements that don't implement the URI
handler interface should ideally generate a unique, deterministic
stream-id manually instead.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>A source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>Parent <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> of <em class="parameter"><code>pad</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream_id</code></em> :</span></p></td>
<td>The stream-id. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A stream-id for <em class="parameter"><code>pad</code></em>. <a href="http://library.gnome.org/devel/glib/unstable/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> after usage.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-create-stream-id-printf"></a><h3>gst_pad_create_stream_id_printf ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_pad_create_stream_id_printf (<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="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *parent</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *stream_id</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Creates a stream-id for the source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> <em class="parameter"><code>pad</code></em> by combining the
upstream information with the optional <em class="parameter"><code>stream_id</code></em> of the stream
of <em class="parameter"><code>pad</code></em>. <em class="parameter"><code>pad</code></em> must have a parent <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> and which must have zero
or one sinkpad. <em class="parameter"><code>stream_id</code></em> can only be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the parent element
of <em class="parameter"><code>pad</code></em> has only a single source pad.
</p>
<p>
This function generates an unique stream-id by getting the upstream
stream-start event stream ID and appending <em class="parameter"><code>stream_id</code></em> to it. If the
element has no sinkpad it will generate an upstream stream-id by
doing an URI query on the element and in the worst case just uses
a random number. Source elements that don't implement the URI
handler interface should ideally generate a unique, deterministic
stream-id manually instead.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>A source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>Parent <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> of <em class="parameter"><code>pad</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream_id</code></em> :</span></p></td>
<td>The stream-id. <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><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>parameters for the <em class="parameter"><code>stream_id</code></em> format string</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A stream-id for <em class="parameter"><code>pad</code></em>. <a href="http://library.gnome.org/devel/glib/unstable/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> after usage.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-create-stream-id-printf-valist"></a><h3>gst_pad_create_stream_id_printf_valist ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_pad_create_stream_id_printf_valist
(<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="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *parent</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *stream_id</code></em>,
<em class="parameter"><code><span class="type">va_list</span> var_args</code></em>);</pre>
<p>
Creates a stream-id for the source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> <em class="parameter"><code>pad</code></em> by combining the
upstream information with the optional <em class="parameter"><code>stream_id</code></em> of the stream
of <em class="parameter"><code>pad</code></em>. <em class="parameter"><code>pad</code></em> must have a parent <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> and which must have zero
or one sinkpad. <em class="parameter"><code>stream_id</code></em> can only be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the parent element
of <em class="parameter"><code>pad</code></em> has only a single source pad.
</p>
<p>
This function generates an unique stream-id by getting the upstream
stream-start event stream ID and appending <em class="parameter"><code>stream_id</code></em> to it. If the
element has no sinkpad it will generate an upstream stream-id by
doing an URI query on the element and in the worst case just uses
a random number. Source elements that don't implement the URI
handler interface should ideally generate a unique, deterministic
stream-id manually instead.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>A source <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>Parent <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> of <em class="parameter"><code>pad</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream_id</code></em> :</span></p></td>
<td>The stream-id. <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><p><span class="term"><em class="parameter"><code>var_args</code></em> :</span></p></td>
<td>parameters for the <em class="parameter"><code>stream_id</code></em> format string</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A stream-id for <em class="parameter"><code>pad</code></em>. <a href="http://library.gnome.org/devel/glib/unstable/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> after usage.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadForwardFunction"></a><h3>GstPadForwardFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstPadForwardFunction) (<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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
A forward function is called for all internally linked pads, see
<a class="link" href="GstPad.html#gst-pad-forward" title="gst_pad_forward ()"><code class="function">gst_pad_forward()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> that is forwarded.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the gpointer to optional user data.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the dispatching procedure has to be stopped.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-forward"></a><h3>gst_pad_forward ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_forward (<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="GstPad.html#GstPadForwardFunction" title="GstPadForwardFunction ()"><span class="type">GstPadForwardFunction</span></a> forward</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Calls <em class="parameter"><code>forward</code></em> for all internally linked pads of <em class="parameter"><code>pad</code></em>. This function deals with
dynamically changing internal pads and will make sure that the <em class="parameter"><code>forward</code></em>
function is only called once for each pad.
</p>
<p>
When <em class="parameter"><code>forward</code></em> returns TRUE, no further pads will be processed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>forward</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstPadForwardFunction" title="GstPadForwardFunction ()"><span class="type">GstPadForwardFunction</span></a>. <span class="annotation">[<acronym title="The callback is valid only during the call to the method."><span class="acronym">scope call</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to <em class="parameter"><code>forward</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if one of the dispatcher functions returned TRUE.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-chain"></a><h3>gst_pad_chain ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> gst_pad_chain (<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="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>
Chain a buffer to <em class="parameter"><code>pad</code></em>.
</p>
<p>
The function returns <a class="link" href="GstPad.html#GST-FLOW-FLUSHING:CAPS"><span class="type">GST_FLOW_FLUSHING</span></a> if the pad was flushing.
</p>
<p>
If the buffer type is not acceptable for <em class="parameter"><code>pad</code></em> (as negotiated with a
preceeding GST_EVENT_CAPS event), this function returns
<a class="link" href="GstPad.html#GST-FLOW-NOT-NEGOTIATED:CAPS"><span class="type">GST_FLOW_NOT_NEGOTIATED</span></a>.
</p>
<p>
The function proceeds calling the chain function installed on <em class="parameter"><code>pad</code></em> (see
<a class="link" href="GstPad.html#gst-pad-set-chain-function" title="gst_pad_set_chain_function()"><code class="function">gst_pad_set_chain_function()</code></a>) and the return value of that function is
returned to the caller. <a class="link" href="GstPad.html#GST-FLOW-NOT-SUPPORTED:CAPS"><span class="type">GST_FLOW_NOT_SUPPORTED</span></a> is returned if <em class="parameter"><code>pad</code></em> has no
chain function.
</p>
<p>
In all cases, success or failure, the caller loses its reference to <em class="parameter"><code>buffer</code></em>
after calling this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns GST_FLOW_ERROR if not.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> to send, return GST_FLOW_ERROR
if not. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the pad.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-chain-list"></a><h3>gst_pad_chain_list ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> gst_pad_chain_list (<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="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);</pre>
<p>
Chain a bufferlist to <em class="parameter"><code>pad</code></em>.
</p>
<p>
The function returns <a class="link" href="GstPad.html#GST-FLOW-FLUSHING:CAPS"><span class="type">GST_FLOW_FLUSHING</span></a> if the pad was flushing.
</p>
<p>
If <em class="parameter"><code>pad</code></em> was not negotiated properly with a CAPS event, this function
returns <a class="link" href="GstPad.html#GST-FLOW-NOT-NEGOTIATED:CAPS"><span class="type">GST_FLOW_NOT_NEGOTIATED</span></a>.
</p>
<p>
The function proceeds calling the chainlist function installed on <em class="parameter"><code>pad</code></em> (see
<a class="link" href="GstPad.html#gst-pad-set-chain-list-function" title="gst_pad_set_chain_list_function()"><code class="function">gst_pad_set_chain_list_function()</code></a>) and the return value of that function is
returned to the caller. <a class="link" href="GstPad.html#GST-FLOW-NOT-SUPPORTED:CAPS"><span class="type">GST_FLOW_NOT_SUPPORTED</span></a> is returned if <em class="parameter"><code>pad</code></em> has no
chainlist function.
</p>
<p>
In all cases, success or failure, the caller loses its reference to <em class="parameter"><code>list</code></em>
after calling this function.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns GST_FLOW_ERROR if not.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>list</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstBufferList.html#GstBufferList" title="GstBufferList"><span class="type">GstBufferList</span></a> to send, return GST_FLOW_ERROR
if not. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the pad.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-start-task"></a><h3>gst_pad_start_task ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_start_task (<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="GstTask.html#GstTaskFunction" title="GstTaskFunction ()"><span class="type">GstTaskFunction</span></a> func</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>
Starts a task that repeatedly calls <em class="parameter"><code>func</code></em> with <em class="parameter"><code>user_data</code></em>. This function
is mostly used in pad activation functions to start the dataflow.
The <a class="link" href="GstPad.html#GST-PAD-STREAM-LOCK:CAPS" title="GST_PAD_STREAM_LOCK()"><span class="type">GST_PAD_STREAM_LOCK</span></a> of <em class="parameter"><code>pad</code></em> will automatically be acquired
before <em class="parameter"><code>func</code></em> is called.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to start the task of</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the task function to call</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the task function</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>called when <em class="parameter"><code>user_data</code></em> is no longer referenced</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the task could be started.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-pause-task"></a><h3>gst_pad_pause_task ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_pause_task (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Pause the task of <em class="parameter"><code>pad</code></em>. This function will also wait until the
function executed by the task is finished if this function is not
called from the task function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to pause the task of</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a TRUE if the task could be paused or FALSE when the pad
has no task.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-stop-task"></a><h3>gst_pad_stop_task ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_stop_task (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Stop the task of <em class="parameter"><code>pad</code></em>. This function will also make sure that the
function executed by the task will effectively stop if not called
from the GstTaskFunction.
</p>
<p>
This function will deadlock if called from the GstTaskFunction of
the task. Use <a class="link" href="GstTask.html#gst-task-pause" title="gst_task_pause ()"><code class="function">gst_task_pause()</code></a> instead.
</p>
<p>
Regardless of whether the pad has a task, the stream lock is acquired and
released so as to ensure that streaming through this pad has finished.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to stop the task of</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a TRUE if the task could be stopped or FALSE on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-set-active"></a><h3>gst_pad_set_active ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_pad_set_active (<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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);</pre>
<p>
Activates or deactivates the given pad.
Normally called from within core state change functions.
</p>
<p>
If <em class="parameter"><code>active</code></em>, makes sure the pad is active. If it is already active, either in
push or pull mode, just return. Otherwise dispatches to the pad's activate
function to perform the actual activation.
</p>
<p>
If not <em class="parameter"><code>active</code></em>, calls <a class="link" href="GstPad.html#gst-pad-activate-mode" title="gst_pad_activate_mode ()"><code class="function">gst_pad_activate_mode()</code></a> with the pad's current mode
and a FALSE argument.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to activate or deactivate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>active</code></em> :</span></p></td>
<td>whether or not the pad should be active.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a> if the operation was successful.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-GET-STREAM-LOCK:CAPS"></a><h3>GST_PAD_GET_STREAM_LOCK()</h3>
<pre class="programlisting">#define GST_PAD_GET_STREAM_LOCK(pad) (&amp;(GST_PAD_CAST(pad)-&gt;stream_rec_lock))
</pre>
<p>
Get the stream lock of <em class="parameter"><code>pad</code></em>. The stream lock is protecting the
resources used in the data processing functions of <em class="parameter"><code>pad</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-STREAM-LOCK:CAPS"></a><h3>GST_PAD_STREAM_LOCK()</h3>
<pre class="programlisting">#define GST_PAD_STREAM_LOCK(pad) g_rec_mutex_lock(GST_PAD_GET_STREAM_LOCK(pad))
</pre>
<p>
Lock the stream lock of <em class="parameter"><code>pad</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-STREAM-TRYLOCK:CAPS"></a><h3>GST_PAD_STREAM_TRYLOCK()</h3>
<pre class="programlisting">#define GST_PAD_STREAM_TRYLOCK(pad) g_rec_mutex_trylock(GST_PAD_GET_STREAM_LOCK(pad))
</pre>
<p>
Try to Lock the stream lock of the pad, return TRUE if the lock could be
taken.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-STREAM-UNLOCK:CAPS"></a><h3>GST_PAD_STREAM_UNLOCK()</h3>
<pre class="programlisting">#define GST_PAD_STREAM_UNLOCK(pad) g_rec_mutex_unlock(GST_PAD_GET_STREAM_LOCK(pad))
</pre>
<p>
Unlock the stream lock of <em class="parameter"><code>pad</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</td>
</tr></tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GstPad.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstPad--caps"></a><h3>The <code class="literal">"caps"</code> property</h3>
<pre class="programlisting"> "caps" <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a>* : Read</pre>
<p>The capabilities of the pad.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstPad--direction"></a><h3>The <code class="literal">"direction"</code> property</h3>
<pre class="programlisting"> "direction" <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> : Read / Write / Construct Only</pre>
<p>The direction of the pad.</p>
<p>Default value: GST_PAD_UNKNOWN</p>
</div>
<hr>
<div class="refsect2">
<a name="GstPad--template"></a><h3>The <code class="literal">"template"</code> property</h3>
<pre class="programlisting"> "template" <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>* : Read / Write</pre>
<p>The GstPadTemplate of this pad.</p>
</div>
</div>
<div class="refsect1">
<a name="GstPad.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstPad-linked"></a><h3>The <code class="literal">"linked"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad,
<a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *peer,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
Signals that a pad has been linked to the peer pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the pad that emitted the signal</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>peer</code></em> :</span></p></td>
<td>the peer pad that has been connected</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPad-unlinked"></a><h3>The <code class="literal">"unlinked"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad,
<a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *peer,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
Signals that a pad has been unlinked from the peer pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the pad that emitted the signal</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>peer</code></em> :</span></p></td>
<td>the peer pad that has been disconnected</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GstPad.see-also"></a><h2>See Also</h2>
<a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>, <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>, <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a>, <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a>, <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a>
</div>
</div>
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