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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#CoglGstVideoSink.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#CoglGstVideoSink.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties">  <span class="dim">|</span> 
                  <a href="#CoglGstVideoSink.properties" class="shortcut">Properties</a></span><span id="nav_signals">  <span class="dim">|</span> 
                  <a href="#CoglGstVideoSink.signals" class="shortcut">Signals</a></span>
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<div class="refentry">
<a name="CoglGstVideoSink"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="CoglGstVideoSink.top_of_page"></a>CoglGstVideoSink</span></h2>
<p>CoglGstVideoSink — A video sink for integrating a GStreamer
  pipeline with a Cogl pipeline.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="CoglGstVideoSink.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="returnvalue">CoglGstVideoSink</span></a> *
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-new" title="cogl_gst_video_sink_new ()">cogl_gst_video_sink_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-set-context" title="cogl_gst_video_sink_set_context ()">cogl_gst_video_sink_set_context</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">CoglPipeline</span> *
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-pipeline" title="cogl_gst_video_sink_get_pipeline ()">cogl_gst_video_sink_get_pipeline</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-attach-frame" title="cogl_gst_video_sink_attach_frame ()">cogl_gst_video_sink_attach_frame</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-setup-pipeline" title="cogl_gst_video_sink_setup_pipeline ()">cogl_gst_video_sink_setup_pipeline</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-free-layer" title="cogl_gst_video_sink_get_free_layer ()">cogl_gst_video_sink_get_free_layer</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-set-first-layer" title="cogl_gst_video_sink_set_first_layer ()">cogl_gst_video_sink_set_first_layer</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-set-default-sample" title="cogl_gst_video_sink_set_default_sample ()">cogl_gst_video_sink_set_default_sample</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">CoglBool</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-is-ready" title="cogl_gst_video_sink_is_ready ()">cogl_gst_video_sink_is_ready</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">float</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-aspect" title="cogl_gst_video_sink_get_aspect ()">cogl_gst_video_sink_get_aspect</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">float</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-width-for-height" title="cogl_gst_video_sink_get_width_for_height ()">cogl_gst_video_sink_get_width_for_height</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">float</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-height-for-width" title="cogl_gst_video_sink_get_height_for_width ()">cogl_gst_video_sink_get_height_for_width</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-fit-size" title="cogl_gst_video_sink_fit_size ()">cogl_gst_video_sink_fit_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.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"><span class="type">gint</span></td>
<td class="property_name"><a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink--update-priority" title="The “update-priority” property">update-priority</a></td>
<td class="property_flags">Read / Write</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.signals"></a><h2>Signals</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-new-frame" title="The “new-frame” signal">new-frame</a></td>
<td class="signal_flags">Run Last</td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-pipeline-ready" title="The “pipeline-ready” signal">pipeline-ready</a></td>
<td class="signal_flags">Run Last</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.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="CoglGstVideoSink.html#CoglGstVideoSink-struct" title="struct CoglGstVideoSink">CoglGstVideoSink</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="CoglGstVideoSink.html#CoglGstVideoSinkClass" title="struct CoglGstVideoSinkClass">CoglGstVideoSinkClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    GObject
    <span class="lineart">╰──</span> GInitiallyUnowned
        <span class="lineart">╰──</span> GstObject
            <span class="lineart">╰──</span> GstElement
                <span class="lineart">╰──</span> GstBaseSink
                    <span class="lineart">╰──</span> CoglGstVideoSink
</pre>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.description"></a><h2>Description</h2>
<p><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> is a subclass of <span class="type">GstBaseSink</span> which can be used to
create a <span class="type">CoglPipeline</span> for rendering the frames of the video.</p>
<p>To create a basic video player, an application can create a
<span class="type">GstPipeline</span> as normal using <code class="function">gst_pipeline_new()</code> and set the
sink on it to one created with <a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-new" title="cogl_gst_video_sink_new ()"><code class="function">cogl_gst_video_sink_new()</code></a>. The
application can then listen for the <a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-new-frame" title="The “new-frame” signal"><span class="type">“new-frame”</span></a>
signal which will be emitted whenever there are new textures ready
for rendering. For simple rendering, the application can just call
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-pipeline" title="cogl_gst_video_sink_get_pipeline ()"><code class="function">cogl_gst_video_sink_get_pipeline()</code></a> in the signal handler and use
the returned pipeline to paint the new frame.</p>
<p>An application is also free to do more advanced rendering by
customizing the pipeline. In that case it should listen for the
<a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-pipeline-ready" title="The “pipeline-ready” signal"><span class="type">“pipeline-ready”</span></a> signal which will be emitted as
soon as the sink has determined enough information about the video
to know how it should be rendered. In the handler for this signal,
the application can either make modifications to a copy of the
pipeline returned by <a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-pipeline" title="cogl_gst_video_sink_get_pipeline ()"><code class="function">cogl_gst_video_sink_get_pipeline()</code></a> or it can
create its own pipeline from scratch and ask the sink to configure
it with <a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-setup-pipeline" title="cogl_gst_video_sink_setup_pipeline ()"><code class="function">cogl_gst_video_sink_setup_pipeline()</code></a>. If a custom pipeline
is created using one of these methods then the application should
call <a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-attach-frame" title="cogl_gst_video_sink_attach_frame ()"><code class="function">cogl_gst_video_sink_attach_frame()</code></a> on the pipeline before
rendering in order to update the textures on the pipeline's layers.</p>
<p>If the <code class="literal">COGL_FEATURE_ID_GLSL</code> feature is available then the pipeline
used by the sink will have a shader snippet with a function in it
called cogl_gst_sample_video0 which takes a single vec2 argument.
This can be used by custom snippets set the by the application to
sample from the video. The vec2 argument represents the normalised
coordinates within the video. The function returns a vec4
containing a pre-multiplied RGBA color of the pixel within the
video.</p>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cogl-gst-video-sink-new"></a><h3>cogl_gst_video_sink_new ()</h3>
<pre class="programlisting"><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="returnvalue">CoglGstVideoSink</span></a> *
cogl_gst_video_sink_new (<em class="parameter"><code><span class="type">CoglContext</span> *ctx</code></em>);</pre>
<p>Creates a new <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> which will create resources for use
with the given context.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-new.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>ctx</p></td>
<td class="parameter_description"><p>The <span class="type">CoglContext</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-gst-video-sink-new.returns"></a><h4>Returns</h4>
<p> a new <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-set-context"></a><h3>cogl_gst_video_sink_set_context ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_gst_video_sink_set_context (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *vt</code></em>,
                                 <em class="parameter"><code><span class="type">CoglContext</span> *ctx</code></em>);</pre>
<p>Sets the <span class="type">CoglContext</span> that the video sink should use for creating
any resources. This function would normally only be used if the
sink was constructed via <code class="function">gst_element_factory_make()</code> instead of
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-new" title="cogl_gst_video_sink_new ()"><code class="function">cogl_gst_video_sink_new()</code></a>.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-set-context.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>vt</p></td>
<td class="parameter_description"><p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ctx</p></td>
<td class="parameter_description"><p>The <span class="type">CoglContext</span> for the sink to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-get-pipeline"></a><h3>cogl_gst_video_sink_get_pipeline ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglPipeline</span> *
cogl_gst_video_sink_get_pipeline (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *vt</code></em>);</pre>
<p>Returns a pipeline suitable for rendering the current frame of the
given video sink. The pipeline will already have the textures for
the frame attached. For simple rendering, an application will
typically call this function immediately before it paints the
video. It can then just paint a rectangle using the returned
pipeline.</p>
<p>An application is free to make a copy of this
pipeline and modify it for custom rendering.</p>
<p>Note: it is considered an error to call this function before the
<a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-pipeline-ready" title="The “pipeline-ready” signal"><span class="type">“pipeline-ready”</span></a> signal is emitted.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-pipeline.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>vt</p></td>
<td class="parameter_description"><p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-pipeline.returns"></a><h4>Returns</h4>
<p> the pipeline for rendering the
current frame. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-attach-frame"></a><h3>cogl_gst_video_sink_attach_frame ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_gst_video_sink_attach_frame (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>,
                                  <em class="parameter"><code><span class="type">CoglPipeline</span> *pln</code></em>);</pre>
<p>Updates the given pipeline with the textures for the current frame.
This can be used if the application wants to customize the
rendering using its own pipeline. Typically this would be called in
response to the <a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-new-frame" title="The “new-frame” signal"><span class="type">“new-frame”</span></a> signal which is
emitted whenever the new textures are available. The application
would then make a copy of its template pipeline and call this to
set the textures.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-attach-frame.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pln</p></td>
<td class="parameter_description"><p>A <span class="type">CoglPipeline</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-setup-pipeline"></a><h3>cogl_gst_video_sink_setup_pipeline ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_gst_video_sink_setup_pipeline (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>,
                                    <em class="parameter"><code><span class="type">CoglPipeline</span> *pipeline</code></em>);</pre>
<p>Configures the given pipeline so that will be able to render the
video for the <em class="parameter"><code>sink</code></em>
. This should only be used if the application
wants to perform some custom rendering using its own pipeline.
Typically an application will call this in response to the
<a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-pipeline-ready" title="The “pipeline-ready” signal"><span class="type">“pipeline-ready”</span></a> signal.</p>
<p>Note: it is considered an error to call this function before the
<a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-pipeline-ready" title="The “pipeline-ready” signal"><span class="type">“pipeline-ready”</span></a> signal is emitted.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-setup-pipeline.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pipeline</p></td>
<td class="parameter_description"><p>A <span class="type">CoglPipeline</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-get-free-layer"></a><h3>cogl_gst_video_sink_get_free_layer ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
cogl_gst_video_sink_get_free_layer (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>);</pre>
<p>This can be used when doing specialised rendering of the video by
customizing the pipeline. <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> may use up to three
private layers on the pipeline in order to attach the textures of
the video frame. This function will return the index of the next
available unused layer after the sink's internal layers. This can
be used by the application to add additional layers, for example to
blend in another color in the fragment processing.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-free-layer.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-free-layer.returns"></a><h4>Returns</h4>
<p> the index of the next available layer after the
sink's internal layers.</p>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-set-first-layer"></a><h3>cogl_gst_video_sink_set_first_layer ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_gst_video_sink_set_first_layer (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>,
                                     <em class="parameter"><code><span class="type">int</span> first_layer</code></em>);</pre>
<p>Sets the index of the first layer that the sink will use for its
rendering. This is useful if the application wants to have custom
layers that appear before the layers added by the sink. In that
case by default the sink's layers will be modulated with the result
of the application's layers that come before <em class="parameter"><code>first_layer</code></em>
.</p>
<p>Note that if this function is called then the name of the function
to call in the shader snippets to sample the video will also
change. For example, if <em class="parameter"><code>first_layer</code></em>
 is three then the function
will be cogl_gst_sample_video3.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-set-first-layer.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>first_layer</p></td>
<td class="parameter_description"><p>The new first layer</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-set-default-sample"></a><h3>cogl_gst_video_sink_set_default_sample ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_gst_video_sink_set_default_sample
                               (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>,
                                <em class="parameter"><code><span class="type">CoglBool</span> default_sample</code></em>);</pre>
<p>By default the pipeline generated by
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-setup-pipeline" title="cogl_gst_video_sink_setup_pipeline ()"><code class="function">cogl_gst_video_sink_setup_pipeline()</code></a> and
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-pipeline" title="cogl_gst_video_sink_get_pipeline ()"><code class="function">cogl_gst_video_sink_get_pipeline()</code></a> will have a layer with a shader
snippet that automatically samples the video. If the application
wants to sample the video in a completely custom way using its own
shader snippet it can set <em class="parameter"><code>default_sample</code></em>
 to <code class="literal">FALSE</code> to avoid this
default snippet being added. In that case the application's snippet
can call cogl_gst_sample_video0 to sample the texture itself.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-set-default-sample.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>default_sample</p></td>
<td class="parameter_description"><p>Whether to add the default sampling</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-is-ready"></a><h3>cogl_gst_video_sink_is_ready ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglBool</span>
cogl_gst_video_sink_is_ready (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>);</pre>
<p>Returns whether the pipeline is ready and so
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-pipeline" title="cogl_gst_video_sink_get_pipeline ()"><code class="function">cogl_gst_video_sink_get_pipeline()</code></a> and
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-setup-pipeline" title="cogl_gst_video_sink_setup_pipeline ()"><code class="function">cogl_gst_video_sink_setup_pipeline()</code></a> can be called without causing error.</p>
<p>Note: Normally an application will wait until the
<a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-pipeline-ready" title="The “pipeline-ready” signal"><span class="type">“pipeline-ready”</span></a> signal is emitted instead of
polling the ready status with this api, but sometimes when a sink
is passed between components that didn't have an opportunity to
connect a signal handler this can be useful.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-is-ready.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-gst-video-sink-is-ready.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the sink is ready, else <code class="literal">FALSE</code></p>
</div>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-get-aspect"></a><h3>cogl_gst_video_sink_get_aspect ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>
cogl_gst_video_sink_get_aspect (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>);</pre>
<p>Returns a width-for-height aspect ratio that lets you calculate a
suitable width for displaying your video based on a given height by
multiplying your chosen height by the returned aspect ratio.</p>
<p>This aspect ratio is calculated based on the underlying size of the
video buffers and the current pixel-aspect-ratio.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-aspect.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>A <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-aspect.returns"></a><h4>Returns</h4>
<p> a width-for-height aspect ratio</p>
</div>
<p class="since">Since: 1.16</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.

The Unstable interface level is a warning that these interfaces are  subject to
change without warning and should not be used in unbundled products.

Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-get-width-for-height"></a><h3>cogl_gst_video_sink_get_width_for_height ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>
cogl_gst_video_sink_get_width_for_height
                               (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>,
                                <em class="parameter"><code><span class="type">float</span> height</code></em>);</pre>
<p>Calculates a suitable output width for a specific output <em class="parameter"><code>height</code></em>

that will maintain the video's aspect ratio.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-width-for-height.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>A <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>A specific output <em class="parameter"><code>height</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-width-for-height.returns"></a><h4>Returns</h4>
<p> An output width for the given output <em class="parameter"><code>height</code></em>
.</p>
</div>
<p class="since">Since: 1.16</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.

The Unstable interface level is a warning that these interfaces are  subject to
change without warning and should not be used in unbundled products.

Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-get-height-for-width"></a><h3>cogl_gst_video_sink_get_height_for_width ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>
cogl_gst_video_sink_get_height_for_width
                               (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>,
                                <em class="parameter"><code><span class="type">float</span> width</code></em>);</pre>
<p>Calculates a suitable output height for a specific output <em class="parameter"><code>width</code></em>

that will maintain the video's aspect ratio.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-height-for-width.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>A <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>A specific output <em class="parameter"><code>width</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-gst-video-sink-get-height-for-width.returns"></a><h4>Returns</h4>
<p> An output height for the given output <em class="parameter"><code>width</code></em>
.</p>
</div>
<p class="since">Since: 1.16</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.

The Unstable interface level is a warning that these interfaces are  subject to
change without warning and should not be used in unbundled products.

Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-gst-video-sink-fit-size"></a><h3>cogl_gst_video_sink_fit_size ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_gst_video_sink_fit_size (<em class="parameter"><code><a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink</code></em>,
                              <em class="parameter"><code>const <span class="type">CoglGstRectangle</span> *available</code></em>,
                              <em class="parameter"><code><span class="type">CoglGstRectangle</span> *output</code></em>);</pre>
<p>Calculates a suitable <em class="parameter"><code>output</code></em>
 rectangle that can fit inside the
<em class="parameter"><code>available</code></em>
 space while maintaining the aspect ratio of the current
video.</p>
<p>Applications would typically use this api for "letterboxing" by
using this api to position a video inside a fixed screen space and
filling the remaining space with black borders.</p>
<div class="refsect3">
<a name="cogl-gst-video-sink-fit-size.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>A <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>available</p></td>
<td class="parameter_description"><p> The space available for video output. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input. Default is transfer none."><span class="acronym">in</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>output</p></td>
<td class="parameter_description"><p> The return location for the calculated output position. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.16</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.

The Unstable interface level is a warning that these interfaces are  subject to
change without warning and should not be used in unbundled products.

Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CoglGstVideoSink-struct"></a><h3>struct CoglGstVideoSink</h3>
<pre class="programlisting">struct CoglGstVideoSink;</pre>
<p>The <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> structure contains only private data and
should be accessed using the provided API.</p>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="CoglGstVideoSinkClass"></a><h3>struct CoglGstVideoSinkClass</h3>
<pre class="programlisting">struct CoglGstVideoSinkClass {
  void (* new_frame) (CoglGstVideoSink *sink);
  void (* pipeline_ready) (CoglGstVideoSink *sink);
};
</pre>
<div class="refsect3">
<a name="CoglGstVideoSinkClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="CoglGstVideoSinkClass.new-frame"></a>new_frame</code></em> ()</p></td>
<td class="struct_member_description"><p>handler for the <a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-new-frame" title="The “new-frame” signal"><span class="type">“new-frame”</span></a> signal</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="CoglGstVideoSinkClass.pipeline-ready"></a>pipeline_ready</code></em> ()</p></td>
<td class="struct_member_description"><p>handler for the <a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-pipeline-ready" title="The “pipeline-ready” signal"><span class="type">“pipeline-ready”</span></a> signal</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.16</p>
</div>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="CoglGstVideoSink--update-priority"></a><h3>The <code class="literal">“update-priority”</code> property</h3>
<pre class="programlisting">  “update-priority”          <span class="type">gint</span></pre>
<p>Priority of video updates in the thread.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= -2147483647</p>
<p>Default value: 100</p>
</div>
</div>
<div class="refsect1">
<a name="CoglGstVideoSink.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="CoglGstVideoSink-new-frame"></a><h3>The <code class="literal">“new-frame”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink,
               <span class="type">gpointer</span>          user_data)</pre>
<p>The sink will emit this signal whenever there are new textures
available for a new frame of the video. After this signal is
emitted, an application can call <a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-pipeline" title="cogl_gst_video_sink_get_pipeline ()"><code class="function">cogl_gst_video_sink_get_pipeline()</code></a>
to get a pipeline suitable for rendering the frame. If the
application is using a custom pipeline it can alternatively call
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-attach-frame" title="cogl_gst_video_sink_attach_frame ()"><code class="function">cogl_gst_video_sink_attach_frame()</code></a> to attach the textures.</p>
<div class="refsect3">
<a name="CoglGstVideoSink-new-frame.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>the <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: Run Last</p>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="CoglGstVideoSink-pipeline-ready"></a><h3>The <code class="literal">“pipeline-ready”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a> *sink,
               <span class="type">gpointer</span>          user_data)</pre>
<p>The sink will emit this signal as soon as it has gathered enough
information from the video to configure a pipeline. If the
application wants to do some customized rendering, it can setup its
pipeline after this signal is emitted. The application's pipeline
will typically either be a copy of the one returned by
<a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-get-pipeline" title="cogl_gst_video_sink_get_pipeline ()"><code class="function">cogl_gst_video_sink_get_pipeline()</code></a> or it can be a completely custom
pipeline which is setup using <a class="link" href="CoglGstVideoSink.html#cogl-gst-video-sink-setup-pipeline" title="cogl_gst_video_sink_setup_pipeline ()"><code class="function">cogl_gst_video_sink_setup_pipeline()</code></a>.</p>
<p>Note that it is an error to call either of those functions before
this signal is emitted. The <a class="link" href="CoglGstVideoSink.html#CoglGstVideoSink-new-frame" title="The “new-frame” signal"><span class="type">“new-frame”</span></a> signal
will only be emitted after the pipeline is ready so the application
could also create its pipeline in the handler for that.</p>
<div class="refsect3">
<a name="CoglGstVideoSink-pipeline-ready.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>sink</p></td>
<td class="parameter_description"><p>the <a class="link" href="CoglGstVideoSink.html" title="CoglGstVideoSink"><span class="type">CoglGstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: Run Last</p>
<p class="since">Since: 1.16</p>
</div>
</div>
</div>
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