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| <div class="refentry"> |
| <a name="gst-plugins-bad-plugins-compositor"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-bad-plugins-compositor.top_of_page"></a>compositor</span></h2> |
| <p>compositor</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-compositor.properties"></a><h2>Properties</h2> |
| <div class="informaltable"><table 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"><span class="type">GstCompositorBackground</span></td> |
| <td class="property_name"><a class="link" href="gst-plugins-bad-plugins-compositor.html#GstCompositor--background" title="The “background” property">background</a></td> |
| <td class="property_flags">Read / Write</td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <a name="GstCompositor"></a><a name="GstCompositorPad"></a><div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-compositor.object-hierarchy"></a><h2>Object Hierarchy</h2> |
| <pre class="screen"> <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a> |
| <span class="lineart">╰──</span> <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> |
| <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a> |
| <span class="lineart">├──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a> |
| <span class="lineart">│</span> <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-libs/html/gst-plugins-bad-libs-GstAggregator.html#GstAggregator">GstAggregator</a> |
| <span class="lineart">│</span> <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-libs/html/gst-plugins-bad-libs-GstVideoAggregator.html#GstVideoAggregator">GstVideoAggregator</a> |
| <span class="lineart">│</span> <span class="lineart">╰──</span> GstCompositor |
| <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html">GstPad</a> |
| <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-libs/html/gst-plugins-bad-libs-GstAggregatorPad.html#GstAggregatorPad">GstAggregatorPad</a> |
| <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-libs/html/gst-plugins-bad-libs-GstVideoAggregatorPad.html#GstVideoAggregatorPad">GstVideoAggregatorPad</a> |
| <span class="lineart">╰──</span> GstCompositorPad |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-compositor.description"></a><h2>Description</h2> |
| <p>Compositor can accept AYUV, ARGB and BGRA video streams. For each of the requested |
| sink pads it will compare the incoming geometry and framerate to define the |
| output parameters. Indeed output video frames will have the geometry of the |
| biggest incoming video stream and the framerate of the fastest incoming one.</p> |
| <p>Compositor will do colorspace conversion.</p> |
| <p>Individual parameters for each input stream can be configured on the |
| <a class="link" href="gst-plugins-bad-plugins-compositor.html#GstCompositorPad"><span class="type">GstCompositorPad</span></a>:</p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| "xpos": The x-coordinate position of the top-left corner of the picture |
| (<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>) |
| </li> |
| <li class="listitem"> |
| "ypos": The y-coordinate position of the top-left corner of the picture |
| (<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>) |
| </li> |
| <li class="listitem"> |
| "width": The width of the picture; the input will be scaled if necessary |
| (<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>) |
| </li> |
| <li class="listitem"> |
| "height": The height of the picture; the input will be scaled if necessary |
| (<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>) |
| </li> |
| <li class="listitem"> |
| "alpha": The transparency of the picture; between 0.0 and 1.0. The blending |
| is a simple copy when fully-transparent (0.0) and fully-opaque (1.0). |
| (<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>) |
| </li> |
| <li class="listitem"> |
| "zorder": The z-order position of the picture in the composition; between |
| 0 and 10000. (<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>) |
| </li> |
| </ul></div> |
| <div class="refsect2"> |
| <a name="id-1.2.15.7.6"></a><h3>Sample pipelines</h3> |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 8</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> \ |
| videotestsrc pattern<span class="gtkdoc opt">=</span><span class="number">1</span> <span class="gtkdoc opt">!</span> \ |
| video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span>format<span class="gtkdoc opt">=</span>AYUV<span class="gtkdoc opt">,</span>framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">10</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span>width<span class="gtkdoc opt">=</span><span class="number">100</span><span class="gtkdoc opt">,</span>height<span class="gtkdoc opt">=</span><span class="number">100</span> <span class="gtkdoc opt">!</span> \ |
| videobox border<span class="gtkdoc opt">-</span>alpha<span class="gtkdoc opt">=</span><span class="number">0</span> top<span class="gtkdoc opt">=-</span><span class="number">70</span> bottom<span class="gtkdoc opt">=-</span><span class="number">70</span> right<span class="gtkdoc opt">=-</span><span class="number">220</span> <span class="gtkdoc opt">!</span> \ |
| compositor name<span class="gtkdoc opt">=</span>comp sink_0<span class="gtkdoc opt">::</span>alpha<span class="gtkdoc opt">=</span><span class="number">0.7</span> sink_1<span class="gtkdoc opt">::</span>alpha<span class="gtkdoc opt">=</span><span class="number">0.5</span> <span class="gtkdoc opt">!</span> \ |
| videoconvert <span class="gtkdoc opt">!</span> xvimagesink \ |
| videotestsrc <span class="gtkdoc opt">!</span> \ |
| video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span>format<span class="gtkdoc opt">=</span>AYUV<span class="gtkdoc opt">,</span>framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">5</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span>width<span class="gtkdoc opt">=</span><span class="number">320</span><span class="gtkdoc opt">,</span>height<span class="gtkdoc opt">=</span><span class="number">240</span> <span class="gtkdoc opt">!</span> comp<span class="gtkdoc opt">.</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| A pipeline to demonstrate compositor used together with videobox. |
| This should show a 320x240 pixels video test source with some transparency |
| showing the background checker pattern. Another video test source with just |
| the snow pattern of 100x100 pixels is overlayed on top of the first one on |
| the left vertically centered with a small transparency showing the first |
| video test source behind and the checker pattern under it. Note that the |
| framerate of the output video is 10 frames per second. |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1 |
| 2 |
| 3 |
| 4 |
| 5</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> videotestsrc pattern<span class="gtkdoc opt">=</span><span class="number">1</span> <span class="gtkdoc opt">!</span> \ |
| video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span> framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">10</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">100</span><span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">=</span><span class="number">100</span> <span class="gtkdoc opt">!</span> \ |
| compositor name<span class="gtkdoc opt">=</span>comp <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> ximagesink \ |
| videotestsrc <span class="gtkdoc opt">!</span> \ |
| video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span> framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">5</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">320</span><span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">=</span><span class="number">240</span> <span class="gtkdoc opt">!</span> comp<span class="gtkdoc opt">.</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| A pipeline to demostrate bgra comping. (This does not demonstrate alpha blending). |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1 |
| 2 |
| 3 |
| 4 |
| 5</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> videotestsrc pattern<span class="gtkdoc opt">=</span><span class="number">1</span> <span class="gtkdoc opt">!</span> \ |
| video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span>format <span class="gtkdoc opt">=</span>I420<span class="gtkdoc opt">,</span> framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">10</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">100</span><span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">=</span><span class="number">100</span> <span class="gtkdoc opt">!</span> \ |
| compositor name<span class="gtkdoc opt">=</span>comp <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> ximagesink \ |
| videotestsrc <span class="gtkdoc opt">!</span> \ |
| video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span>format<span class="gtkdoc opt">=</span>I420<span class="gtkdoc opt">,</span> framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">5</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">320</span><span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">=</span><span class="number">240</span> <span class="gtkdoc opt">!</span> comp<span class="gtkdoc opt">.</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| A pipeline to test I420 |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 8</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> compositor name<span class="gtkdoc opt">=</span>comp sink_1<span class="gtkdoc opt">::</span>alpha<span class="gtkdoc opt">=</span><span class="number">0.5</span> sink_1<span class="gtkdoc opt">::</span>xpos<span class="gtkdoc opt">=</span><span class="number">50</span> sink_1<span class="gtkdoc opt">::</span>ypos<span class="gtkdoc opt">=</span><span class="number">50</span> <span class="gtkdoc opt">!</span> \ |
| videoconvert <span class="gtkdoc opt">!</span> ximagesink \ |
| videotestsrc pattern<span class="gtkdoc opt">=</span>snow timestamp<span class="gtkdoc opt">-</span>offset<span class="gtkdoc opt">=</span><span class="number">3000000000</span> <span class="gtkdoc opt">!</span> \ |
| <span class="string">"video/x-raw,format=AYUV,width=640,height=480,framerate=(fraction)30/1"</span> <span class="gtkdoc opt">!</span> \ |
| timeoverlay <span class="gtkdoc opt">!</span> queue2 <span class="gtkdoc opt">!</span> comp<span class="gtkdoc opt">.</span> \ |
| videotestsrc pattern<span class="gtkdoc opt">=</span>smpte <span class="gtkdoc opt">!</span> \ |
| <span class="string">"video/x-raw,format=AYUV,width=800,height=600,framerate=(fraction)10/1"</span> <span class="gtkdoc opt">!</span> \ |
| timeoverlay <span class="gtkdoc opt">!</span> queue2 <span class="gtkdoc opt">!</span> comp<span class="gtkdoc opt">.</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| A pipeline to demonstrate synchronized compositing (the second stream starts after 3 seconds) |
| </div> |
| <p> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-compositor.functions_details"></a><h2>Functions</h2> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-compositor.other_details"></a><h2>Types and Values</h2> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-compositor.property-details"></a><h2>Property Details</h2> |
| <div class="refsect2"> |
| <a name="GstCompositor--background"></a><h3>The <code class="literal">“background”</code> property</h3> |
| <pre class="programlisting"> “background” <span class="type">GstCompositorBackground</span></pre> |
| <p>Background type.</p> |
| <p>Flags: Read / Write</p> |
| <p>Default value: Checker pattern</p> |
| </div> |
| </div> |
| </div> |
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