| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> | |
| <title>ximagesink: GStreamer Base Plugins 1.0 Plugins Reference Manual</title> | |
| <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> | |
| <link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Plugins Reference Manual"> | |
| <link rel="up" href="ch01.html" title="gst-plugins-base Elements"> | |
| <link rel="prev" href="gst-plugins-base-plugins-vorbistag.html" title="vorbistag"> | |
| <link rel="next" href="gst-plugins-base-plugins-xvimagesink.html" title="xvimagesink"> | |
| <meta name="generator" content="GTK-Doc V1.25 (XML mode)"> | |
| <link rel="stylesheet" href="style.css" type="text/css"> | |
| </head> | |
| <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> | |
| <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> | |
| <td width="100%" align="left" class="shortcuts"> | |
| <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> | |
| <a href="#gst-plugins-base-plugins-ximagesink.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> | |
| <a href="#gst-plugins-base-plugins-ximagesink.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_interfaces"> <span class="dim">|</span> | |
| <a href="#gst-plugins-base-plugins-ximagesink.implemented-interfaces" class="shortcut">Implemented Interfaces</a></span><span id="nav_properties"> <span class="dim">|</span> | |
| <a href="#gst-plugins-base-plugins-ximagesink.properties" class="shortcut">Properties</a></span> | |
| </td> | |
| <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> | |
| <td><a accesskey="u" href="ch01.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> | |
| <td><a accesskey="p" href="gst-plugins-base-plugins-vorbistag.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> | |
| <td><a accesskey="n" href="gst-plugins-base-plugins-xvimagesink.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> | |
| </tr></table> | |
| <div class="refentry"> | |
| <a name="gst-plugins-base-plugins-ximagesink"></a><div class="titlepage"></div> | |
| <div class="refnamediv"><table width="100%"><tr> | |
| <td valign="top"> | |
| <h2><span class="refentrytitle"><a name="gst-plugins-base-plugins-ximagesink.top_of_page"></a>ximagesink</span></h2> | |
| <p>ximagesink</p> | |
| </td> | |
| <td class="gallery_image" valign="top" align="right"></td> | |
| </tr></table></div> | |
| <div class="refsect1"> | |
| <a name="gst-plugins-base-plugins-ximagesink.properties"></a><h2>Properties</h2> | |
| <div class="informaltable"><table class="informaltable" border="0"> | |
| <colgroup> | |
| <col width="150px" class="properties_type"> | |
| <col width="300px" class="properties_name"> | |
| <col width="200px" class="properties_flags"> | |
| </colgroup> | |
| <tbody> | |
| <tr> | |
| <td class="property_type"> | |
| <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td> | |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--display" title="The “display” property">display</a></td> | |
| <td class="property_flags">Read / Write</td> | |
| </tr> | |
| <tr> | |
| <td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td> | |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--force-aspect-ratio" title="The “force-aspect-ratio” property">force-aspect-ratio</a></td> | |
| <td class="property_flags">Read / Write</td> | |
| </tr> | |
| <tr> | |
| <td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td> | |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--handle-events" title="The “handle-events” property">handle-events</a></td> | |
| <td class="property_flags">Read / Write</td> | |
| </tr> | |
| <tr> | |
| <td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td> | |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--handle-expose" title="The “handle-expose” property">handle-expose</a></td> | |
| <td class="property_flags">Read / Write</td> | |
| </tr> | |
| <tr> | |
| <td class="property_type"> | |
| <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td> | |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--pixel-aspect-ratio" title="The “pixel-aspect-ratio” property">pixel-aspect-ratio</a></td> | |
| <td class="property_flags">Read / Write</td> | |
| </tr> | |
| <tr> | |
| <td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td> | |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--synchronous" title="The “synchronous” property">synchronous</a></td> | |
| <td class="property_flags">Read / Write</td> | |
| </tr> | |
| <tr> | |
| <td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td> | |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--window-height" title="The “window-height” property">window-height</a></td> | |
| <td class="property_flags">Read</td> | |
| </tr> | |
| <tr> | |
| <td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td> | |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--window-width" title="The “window-width” property">window-width</a></td> | |
| <td class="property_flags">Read</td> | |
| </tr> | |
| </tbody> | |
| </table></div> | |
| </div> | |
| <a name="GstXImageSink"></a><div class="refsect1"> | |
| <a name="gst-plugins-base-plugins-ximagesink.other"></a><h2>Types and Values</h2> | |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> | |
| <colgroup> | |
| <col width="150px" class="name"> | |
| <col class="description"> | |
| </colgroup> | |
| <tbody><tr> | |
| <td class="datatype_keyword">struct</td> | |
| <td class="function_name"><a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink-struct" title="struct GstXImageSink">GstXImageSink</a></td> | |
| </tr></tbody> | |
| </table></div> | |
| </div> | |
| <div class="refsect1"> | |
| <a name="gst-plugins-base-plugins-ximagesink.object-hierarchy"></a><h2>Object Hierarchy</h2> | |
| <pre class="screen"> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct">GObject</a> | |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> | |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstObject.html#GstObject-struct">GstObject</a> | |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstElement.html#GstElement-struct">GstElement</a> | |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0GstBaseSink.html#GstBaseSink-struct">GstBaseSink</a> | |
| <span class="lineart">╰──</span> <a href="../html/gst-plugins-base-libs-gstvideosink.html#GstVideoSink-struct">GstVideoSink</a> | |
| <span class="lineart">╰──</span> GstXImageSink | |
| </pre> | |
| </div> | |
| <div class="refsect1"> | |
| <a name="gst-plugins-base-plugins-ximagesink.implemented-interfaces"></a><h2>Implemented Interfaces</h2> | |
| <p> | |
| GstXImageSink implements | |
| <a href="../html/gst-plugins-base-libs-gstnavigation.html#GstNavigation-struct">GstNavigation</a> and <a href="../html/gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay-struct">GstVideoOverlay</a>.</p> | |
| </div> | |
| <div class="refsect1"> | |
| <a name="gst-plugins-base-plugins-ximagesink.description"></a><h2>Description</h2> | |
| <p>XImageSink renders video frames to a drawable (XWindow) on a local or remote | |
| display. This element can receive a Window ID from the application through | |
| the <a href="../html/gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay-struct"><span class="type">GstVideoOverlay</span></a> interface and will then render video frames in this | |
| drawable. If no Window ID was provided by the application, the element will | |
| create its own internal window and render into it.</p> | |
| <div class="refsect2"> | |
| <a name="id-1.2.62.8.3"></a><h3>Scaling</h3> | |
| <p> | |
| As standard XImage rendering to a drawable is not scaled, XImageSink will use | |
| reverse caps negotiation to try to get scaled video frames for the drawable. | |
| This is accomplished by asking the peer pad if it accepts some different caps | |
| which in most cases implies that there is a scaling element in the pipeline, | |
| or that an element generating the video frames can generate them with a | |
| different geometry. This mechanism is handled during buffer allocations, for | |
| each allocation request the video sink will check the drawable geometry, look | |
| at the <a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--force-aspect-ratio" title="The “force-aspect-ratio” property"><span class="type">“force-aspect-ratio”</span></a> property, calculate the geometry of | |
| desired video frames and then check that the peer pad accept those new caps. | |
| If it does it will then allocate a buffer in video memory with this new | |
| geometry and return it with the new caps. | |
| </p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="id-1.2.62.8.4"></a><h3>Events</h3> | |
| <p> | |
| XImageSink creates a thread to handle events coming from the drawable. There | |
| are several kind of events that can be grouped in 2 big categories: input | |
| events and window state related events. Input events will be translated to | |
| navigation events and pushed upstream for other elements to react on them. | |
| This includes events such as pointer moves, key press/release, clicks etc... | |
| Other events are used to handle the drawable appearance even when the data | |
| is not flowing (GST_STATE_PAUSED). That means that even when the element is | |
| paused, it will receive expose events from the drawable and draw the latest | |
| frame with correct borders/aspect-ratio. | |
| </p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="id-1.2.62.8.5"></a><h3>Pixel aspect ratio</h3> | |
| <p> | |
| When changing state to GST_STATE_READY, XImageSink will open a connection to | |
| the display specified in the <a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--display" title="The “display” property"><span class="type">“display”</span></a> property or the default | |
| display if nothing specified. Once this connection is open it will inspect | |
| the display configuration including the physical display geometry and | |
| then calculate the pixel aspect ratio. When caps negotiation will occur, the | |
| video sink will set the calculated pixel aspect ratio on the caps to make | |
| sure that incoming video frames will have the correct pixel aspect ratio for | |
| this display. Sometimes the calculated pixel aspect ratio can be wrong, it is | |
| then possible to enforce a specific pixel aspect ratio using the | |
| <a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink--pixel-aspect-ratio" title="The “pixel-aspect-ratio” property"><span class="type">“pixel-aspect-ratio”</span></a> property. | |
| </p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="id-1.2.62.8.6"></a><h3>Examples</h3> | |
| <div class="informalexample"> | |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> | |
| <tbody> | |
| <tr> | |
| <td class="listing_lines" align="right"><pre>1</pre></td> | |
| <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> <span class="gtkdoc opt">-</span>v videotestsrc <span class="gtkdoc opt">!</span> queue <span class="gtkdoc opt">!</span> ximagesink</pre></td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| </div> | |
| A pipeline to test reverse negotiation. When the test video signal appears | |
| you can resize the window and see that scaled buffers of the desired size are | |
| going to arrive with a short delay. This illustrates how buffers of desired | |
| size are allocated along the way. If you take away the queue, scaling will | |
| happen almost immediately. | |
| <div class="informalexample"> | |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> | |
| <tbody> | |
| <tr> | |
| <td class="listing_lines" align="right"><pre>1</pre></td> | |
| <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> <span class="gtkdoc opt">-</span>v videotestsrc <span class="gtkdoc opt">!</span> navigationtest <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> ximagesink</pre></td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| </div> | |
| A pipeline to test navigation events. | |
| While moving the mouse pointer over the test signal you will see a black box | |
| following the mouse pointer. If you press the mouse button somewhere on the | |
| video and release it somewhere else a green box will appear where you pressed | |
| the button and a red one where you released it. (The navigationtest element | |
| is part of gst-plugins-good.) | |
| <div class="informalexample"> | |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> | |
| <tbody> | |
| <tr> | |
| <td class="listing_lines" align="right"><pre>1</pre></td> | |
| <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> <span class="gtkdoc opt">-</span>v videotestsrc <span class="gtkdoc opt">!</span> video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span> pixel<span class="gtkdoc opt">-</span>aspect<span class="gtkdoc opt">-</span>ratio<span class="gtkdoc opt">=(</span>fraction<span class="gtkdoc opt">)</span><span class="number">4</span><span class="gtkdoc opt">/</span><span class="number">3</span> <span class="gtkdoc opt">!</span> videoscale <span class="gtkdoc opt">!</span> ximagesink</pre></td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| </div> | |
| This is faking a 4/3 pixel aspect ratio caps on video frames produced by | |
| videotestsrc, in most cases the pixel aspect ratio of the display will be | |
| 1/1. This means that videoscale will have to do the scaling to convert | |
| incoming frames to a size that will match the display pixel aspect ratio | |
| (from 320x240 to 320x180 in this case). Note that you might have to escape | |
| some characters for your shell like '\(fraction\)'. | |
| </div> | |
| <div class="refsynopsisdiv"> | |
| <h2>Synopsis</h2> | |
| <div class="refsect2"> | |
| <a name="id-1.2.62.8.7.1"></a><h3>Element Information</h3> | |
| <div class="variablelist"><table border="0" class="variablelist"> | |
| <colgroup> | |
| <col align="left" valign="top"> | |
| <col> | |
| </colgroup> | |
| <tbody> | |
| <tr> | |
| <td><p><span class="term">plugin</span></p></td> | |
| <td> | |
| <a class="link" href="gst-plugins-base-plugins-plugin-ximagesink.html#plugin-ximagesink">ximagesink</a> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td><p><span class="term">author</span></p></td> | |
| <td>Julien Moutte <julien@moutte.net></td> | |
| </tr> | |
| <tr> | |
| <td><p><span class="term">class</span></p></td> | |
| <td>Sink/Video</td> | |
| </tr> | |
| </tbody> | |
| </table></div> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="id-1.2.62.8.7.2"></a><h3>Element Pads</h3> | |
| <div class="variablelist"><table border="0" class="variablelist"> | |
| <colgroup> | |
| <col align="left" valign="top"> | |
| <col> | |
| </colgroup> | |
| <tbody> | |
| <tr> | |
| <td><p><span class="term">name</span></p></td> | |
| <td>sink</td> | |
| </tr> | |
| <tr> | |
| <td><p><span class="term">direction</span></p></td> | |
| <td>sink</td> | |
| </tr> | |
| <tr> | |
| <td><p><span class="term">presence</span></p></td> | |
| <td>always</td> | |
| </tr> | |
| <tr> | |
| <td><p><span class="term">details</span></p></td> | |
| <td>video/x-raw, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ]</td> | |
| </tr> | |
| </tbody> | |
| </table></div> | |
| </div> | |
| </div> | |
| </div> | |
| <div class="refsect1"> | |
| <a name="gst-plugins-base-plugins-ximagesink.functions_details"></a><h2>Functions</h2> | |
| <p></p> | |
| </div> | |
| <div class="refsect1"> | |
| <a name="gst-plugins-base-plugins-ximagesink.other_details"></a><h2>Types and Values</h2> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink-struct"></a><h3>struct GstXImageSink</h3> | |
| <pre class="programlisting">struct GstXImageSink;</pre> | |
| <p>The <a class="link" href="gst-plugins-base-plugins-ximagesink.html#GstXImageSink"><span class="type">GstXImageSink</span></a> data structure.</p> | |
| <div class="refsect3"> | |
| <a name="GstXImageSink.members"></a><h4>Members</h4> | |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> | |
| <colgroup> | |
| <col width="300px" class="struct_members_name"> | |
| <col class="struct_members_description"> | |
| <col width="200px" class="struct_members_annotations"> | |
| </colgroup> | |
| <tbody></tbody> | |
| </table></div> | |
| </div> | |
| </div> | |
| </div> | |
| <div class="refsect1"> | |
| <a name="gst-plugins-base-plugins-ximagesink.property-details"></a><h2>Property Details</h2> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink--display"></a><h3>The <code class="literal">“display”</code> property</h3> | |
| <pre class="programlisting"> “display” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre> | |
| <p>X Display name.</p> | |
| <p>Flags: Read / Write</p> | |
| <p>Default value: NULL</p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink--force-aspect-ratio"></a><h3>The <code class="literal">“force-aspect-ratio”</code> property</h3> | |
| <pre class="programlisting"> “force-aspect-ratio” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> | |
| <p>When enabled, reverse caps negotiation (scaling) will respect original aspect ratio.</p> | |
| <p>Flags: Read / Write</p> | |
| <p>Default value: TRUE</p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink--handle-events"></a><h3>The <code class="literal">“handle-events”</code> property</h3> | |
| <pre class="programlisting"> “handle-events” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> | |
| <p>When enabled, XEvents will be selected and handled.</p> | |
| <p>Flags: Read / Write</p> | |
| <p>Default value: TRUE</p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink--handle-expose"></a><h3>The <code class="literal">“handle-expose”</code> property</h3> | |
| <pre class="programlisting"> “handle-expose” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> | |
| <p>When enabled, the current frame will always be drawn in response to X Expose events.</p> | |
| <p>Flags: Read / Write</p> | |
| <p>Default value: TRUE</p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink--pixel-aspect-ratio"></a><h3>The <code class="literal">“pixel-aspect-ratio”</code> property</h3> | |
| <pre class="programlisting"> “pixel-aspect-ratio” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre> | |
| <p>The pixel aspect ratio of the device.</p> | |
| <p>Flags: Read / Write</p> | |
| <p>Default value: "1/1"</p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink--synchronous"></a><h3>The <code class="literal">“synchronous”</code> property</h3> | |
| <pre class="programlisting"> “synchronous” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> | |
| <p>When enabled, runs the X display in synchronous mode. (unrelated to A/V sync, used only for debugging).</p> | |
| <p>Flags: Read / Write</p> | |
| <p>Default value: FALSE</p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink--window-height"></a><h3>The <code class="literal">“window-height”</code> property</h3> | |
| <pre class="programlisting"> “window-height” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre> | |
| <p>Actual height of the video window.</p> | |
| <p>Flags: Read</p> | |
| <p>Default value: 0</p> | |
| </div> | |
| <hr> | |
| <div class="refsect2"> | |
| <a name="GstXImageSink--window-width"></a><h3>The <code class="literal">“window-width”</code> property</h3> | |
| <pre class="programlisting"> “window-width” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre> | |
| <p>Actual width of the video window.</p> | |
| <p>Flags: Read</p> | |
| <p>Default value: 0</p> | |
| </div> | |
| </div> | |
| </div> | |
| <div class="footer"> | |
| <hr>Generated by GTK-Doc V1.25</div> | |
| </body> | |
| </html> |