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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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                  <a href="#GstVaapiContext.description" class="shortcut">Description</a>
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<a name="GstVaapiContext"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GstVaapiContext.top_of_page"></a>GstVaapiContext</span></h2>
<p>GstVaapiContext — VA context abstraction</p>
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<div class="refsynopsisdiv">
<a name="GstVaapiContext.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct              <a class="link" href="GstVaapiContext.html#GstVaapiContext-struct" title="struct GstVaapiContext">GstVaapiContext</a>;
struct              <a class="link" href="GstVaapiContext.html#GstVaapiContextClass" title="struct GstVaapiContextClass">GstVaapiContextClass</a>;
<a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="returnvalue">GstVaapiContext</span></a> *   <a class="link" href="GstVaapiContext.html#gst-vaapi-context-new" title="gst_vaapi_context_new ()">gst_vaapi_context_new</a>               (<em class="parameter"><code><a class="link" href="GstVaapiDisplay.html" title="GstVaapiDisplay"><span class="type">GstVaapiDisplay</span></a> *display</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a> profile</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiEntrypoint" title="enum GstVaapiEntrypoint"><span class="type">GstVaapiEntrypoint</span></a> entrypoint</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> width</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> height</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="GstVaapiContext.html#gst-vaapi-context-reset" title="gst_vaapi_context_reset ()">gst_vaapi_context_reset</a>             (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a> profile</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiEntrypoint" title="enum GstVaapiEntrypoint"><span class="type">GstVaapiEntrypoint</span></a> entrypoint</code></em>,
                                                         <em class="parameter"><code>unsigned <span class="type">int</span> width</code></em>,
                                                         <em class="parameter"><code>unsigned <span class="type">int</span> height</code></em>);
<a class="link" href="libs-Basic-data-structures.html#GstVaapiID" title="GstVaapiID"><span class="returnvalue">GstVaapiID</span></a>          <a class="link" href="GstVaapiContext.html#gst-vaapi-context-get-id" title="gst_vaapi_context_get_id ()">gst_vaapi_context_get_id</a>            (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);
<a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="returnvalue">GstVaapiProfile</span></a>     <a class="link" href="GstVaapiContext.html#gst-vaapi-context-get-profile" title="gst_vaapi_context_get_profile ()">gst_vaapi_context_get_profile</a>       (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="GstVaapiContext.html#gst-vaapi-context-set-profile" title="gst_vaapi_context_set_profile ()">gst_vaapi_context_set_profile</a>       (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a> profile</code></em>);
<a class="link" href="libs-GstVaapiProfile.html#GstVaapiEntrypoint" title="enum GstVaapiEntrypoint"><span class="returnvalue">GstVaapiEntrypoint</span></a>  <a class="link" href="GstVaapiContext.html#gst-vaapi-context-get-entrypoint" title="gst_vaapi_context_get_entrypoint ()">gst_vaapi_context_get_entrypoint</a>    (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="GstVaapiContext.html#gst-vaapi-context-get-size" title="gst_vaapi_context_get_size ()">gst_vaapi_context_get_size</a>          (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> *pwidth</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> *pheight</code></em>);
<a class="link" href="libs-gstvaapisurface.html#GstVaapiSurface"><span class="returnvalue">GstVaapiSurface</span></a> *   <a class="link" href="GstVaapiContext.html#gst-vaapi-context-get-surface" title="gst_vaapi_context_get_surface ()">gst_vaapi_context_get_surface</a>       (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);
<span class="returnvalue">guint</span>               <a class="link" href="GstVaapiContext.html#gst-vaapi-context-get-surface-count" title="gst_vaapi_context_get_surface_count ()">gst_vaapi_context_get_surface_count</a> (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="GstVaapiContext.html#gst-vaapi-context-put-surface" title="gst_vaapi_context_put_surface ()">gst_vaapi_context_put_surface</a>       (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-gstvaapisurface.html#GstVaapiSurface"><span class="type">GstVaapiSurface</span></a> *surface</code></em>);
<a class="link" href="libs-gstvaapisurface.html#GstVaapiSurface"><span class="returnvalue">GstVaapiSurface</span></a> *   <a class="link" href="GstVaapiContext.html#gst-vaapi-context-find-surface-by-id" title="gst_vaapi_context_find_surface_by_id ()">gst_vaapi_context_find_surface_by_id</a>
                                                        (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-Basic-data-structures.html#GstVaapiID" title="GstVaapiID"><span class="type">GstVaapiID</span></a> id</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="GstVaapiContext.html#gst-vaapi-context-apply-composition" title="gst_vaapi_context_apply_composition ()">gst_vaapi_context_apply_composition</a> (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><span class="type">GstVideoOverlayComposition</span> *composition</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GstVaapiContext.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
  GObject
   +----<a class="link" href="GstVaapiObject.html" title="GstVaapiObject">GstVaapiObject</a>
         +----GstVaapiContext
</pre>
</div>
<div class="refsect1">
<a name="GstVaapiContext.properties"></a><h2>Properties</h2>
<pre class="synopsis">
  "<a class="link" href="GstVaapiContext.html#GstVaapiContext--entrypoint" title='The "entrypoint" property'>entrypoint</a>"               <span class="type">guint</span>                 : Read / Write / Construct Only
  "<a class="link" href="GstVaapiContext.html#GstVaapiContext--height" title='The "height" property'>height</a>"                   <span class="type">guint</span>                 : Read / Write / Construct Only
  "<a class="link" href="GstVaapiContext.html#GstVaapiContext--profile" title='The "profile" property'>profile</a>"                  <span class="type">guint</span>                 : Read / Write
  "<a class="link" href="GstVaapiContext.html#GstVaapiContext--width" title='The "width" property'>width</a>"                    <span class="type">guint</span>                 : Read / Write / Construct Only
</pre>
</div>
<div class="refsect1">
<a name="GstVaapiContext.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="GstVaapiContext.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstVaapiContext-struct"></a><h3>struct GstVaapiContext</h3>
<pre class="programlisting">struct GstVaapiContext;</pre>
<p>
A VA context wrapper.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GstVaapiContextClass"></a><h3>struct GstVaapiContextClass</h3>
<pre class="programlisting">struct GstVaapiContextClass {
};
</pre>
<p>
A VA context wrapper class.
</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-new"></a><h3>gst_vaapi_context_new ()</h3>
<pre class="programlisting"><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="returnvalue">GstVaapiContext</span></a> *   gst_vaapi_context_new               (<em class="parameter"><code><a class="link" href="GstVaapiDisplay.html" title="GstVaapiDisplay"><span class="type">GstVaapiDisplay</span></a> *display</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a> profile</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiEntrypoint" title="enum GstVaapiEntrypoint"><span class="type">GstVaapiEntrypoint</span></a> entrypoint</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> width</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> height</code></em>);</pre>
<p>
Creates a new <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> with the specified codec <em class="parameter"><code>profile</code></em>
and <em class="parameter"><code>entrypoint</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>display</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiDisplay.html" title="GstVaapiDisplay"><span class="type">GstVaapiDisplay</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>profile</code></em> :</span></p></td>
<td>a <a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>entrypoint</code></em> :</span></p></td>
<td>a <a class="link" href="libs-GstVaapiProfile.html#GstVaapiEntrypoint" title="enum GstVaapiEntrypoint"><span class="type">GstVaapiEntrypoint</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>coded width from the bitstream</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>coded height from the bitstream</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the newly allocated <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> object</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-reset"></a><h3>gst_vaapi_context_reset ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            gst_vaapi_context_reset             (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a> profile</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiEntrypoint" title="enum GstVaapiEntrypoint"><span class="type">GstVaapiEntrypoint</span></a> entrypoint</code></em>,
                                                         <em class="parameter"><code>unsigned <span class="type">int</span> width</code></em>,
                                                         <em class="parameter"><code>unsigned <span class="type">int</span> height</code></em>);</pre>
<p>
Resets <em class="parameter"><code>context</code></em> to the specified codec <em class="parameter"><code>profile</code></em> and <em class="parameter"><code>entrypoint</code></em>.
The surfaces will be reallocated if the coded size changed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>profile</code></em> :</span></p></td>
<td>a <a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>entrypoint</code></em> :</span></p></td>
<td>a <a class="link" href="libs-GstVaapiProfile.html#GstVaapiEntrypoint" title="enum GstVaapiEntrypoint"><span class="type">GstVaapiEntrypoint</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>coded width from the bitstream</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>coded height from the bitstream</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> on success</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-get-id"></a><h3>gst_vaapi_context_get_id ()</h3>
<pre class="programlisting"><a class="link" href="libs-Basic-data-structures.html#GstVaapiID" title="GstVaapiID"><span class="returnvalue">GstVaapiID</span></a>          gst_vaapi_context_get_id            (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);</pre>
<p>
Returns the underlying VAContextID of the <em class="parameter"><code>context</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>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the underlying VA context id</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-get-profile"></a><h3>gst_vaapi_context_get_profile ()</h3>
<pre class="programlisting"><a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="returnvalue">GstVaapiProfile</span></a>     gst_vaapi_context_get_profile       (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);</pre>
<p>
Returns the VA profile used by the <em class="parameter"><code>context</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>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the VA profile used by the <em class="parameter"><code>context</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-set-profile"></a><h3>gst_vaapi_context_set_profile ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            gst_vaapi_context_set_profile       (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a> profile</code></em>);</pre>
<p>
Sets the new <em class="parameter"><code>profile</code></em> to use with the <em class="parameter"><code>context</code></em>. If <em class="parameter"><code>profile</code></em> matches
the previous profile, this call has no effect. Otherwise, the
underlying VA context is recreated, while keeping the previously
allocated surfaces.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>profile</code></em> :</span></p></td>
<td>the new <a class="link" href="libs-GstVaapiProfile.html#GstVaapiProfile" title="enum GstVaapiProfile"><span class="type">GstVaapiProfile</span></a> to use</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> on success</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-get-entrypoint"></a><h3>gst_vaapi_context_get_entrypoint ()</h3>
<pre class="programlisting"><a class="link" href="libs-GstVaapiProfile.html#GstVaapiEntrypoint" title="enum GstVaapiEntrypoint"><span class="returnvalue">GstVaapiEntrypoint</span></a>  gst_vaapi_context_get_entrypoint    (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);</pre>
<p>
Returns the VA entrypoint used by the <em class="parameter"><code>context</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>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the VA entrypoint used by the <em class="parameter"><code>context</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-get-size"></a><h3>gst_vaapi_context_get_size ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_vaapi_context_get_size          (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> *pwidth</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> *pheight</code></em>);</pre>
<p>
Retrieves the size of the surfaces attached to <em class="parameter"><code>context</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>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pwidth</code></em> :</span></p></td>
<td>return location for the width, or <code class="literal">NULL</code>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pheight</code></em> :</span></p></td>
<td>return location for the height, or <code class="literal">NULL</code>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-get-surface"></a><h3>gst_vaapi_context_get_surface ()</h3>
<pre class="programlisting"><a class="link" href="libs-gstvaapisurface.html#GstVaapiSurface"><span class="returnvalue">GstVaapiSurface</span></a> *   gst_vaapi_context_get_surface       (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);</pre>
<p>
Acquires a free surface. The returned surface but be released with
<a class="link" href="GstVaapiContext.html#gst-vaapi-context-put-surface" title="gst_vaapi_context_put_surface ()"><code class="function">gst_vaapi_context_put_surface()</code></a>. This function returns <code class="literal">NULL</code> if
there is no free surface available in the pool. The surfaces are
pre-allocated during context creation though.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a free surface, or <code class="literal">NULL</code> if none is available</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-get-surface-count"></a><h3>gst_vaapi_context_get_surface_count ()</h3>
<pre class="programlisting"><span class="returnvalue">guint</span>               gst_vaapi_context_get_surface_count (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>);</pre>
<p>
Retrieves the number of free surfaces left in the pool.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the number of free surfaces available in the pool</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-put-surface"></a><h3>gst_vaapi_context_put_surface ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_vaapi_context_put_surface       (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-gstvaapisurface.html#GstVaapiSurface"><span class="type">GstVaapiSurface</span></a> *surface</code></em>);</pre>
<p>
Releases a surface acquired by <a class="link" href="GstVaapiContext.html#gst-vaapi-context-get-surface" title="gst_vaapi_context_get_surface ()"><code class="function">gst_vaapi_context_get_surface()</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>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>the <a class="link" href="libs-gstvaapisurface.html#GstVaapiSurface"><span class="type">GstVaapiSurface</span></a> to release</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-find-surface-by-id"></a><h3>gst_vaapi_context_find_surface_by_id ()</h3>
<pre class="programlisting"><a class="link" href="libs-gstvaapisurface.html#GstVaapiSurface"><span class="returnvalue">GstVaapiSurface</span></a> *   gst_vaapi_context_find_surface_by_id
                                                        (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libs-Basic-data-structures.html#GstVaapiID" title="GstVaapiID"><span class="type">GstVaapiID</span></a> id</code></em>);</pre>
<p>
Finds VA surface by <em class="parameter"><code>id</code></em> in the list of surfaces attached to the <em class="parameter"><code>context</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>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>the VA surface id to find</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the matching <a class="link" href="libs-gstvaapisurface.html#GstVaapiSurface"><span class="type">GstVaapiSurface</span></a> object, or <code class="literal">NULL</code> if
none was found</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-vaapi-context-apply-composition"></a><h3>gst_vaapi_context_apply_composition ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            gst_vaapi_context_apply_composition (<em class="parameter"><code><a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a> *context</code></em>,
                                                         <em class="parameter"><code><span class="type">GstVideoOverlayComposition</span> *composition</code></em>);</pre>
<p>
Applies video composition planes to all surfaces bound to <em class="parameter"><code>context</code></em>.
This helper function resets any additional subpictures the user may
have associated himself. A <code class="literal">NULL</code> <em class="parameter"><code>composition</code></em> will also clear all
the existing subpictures.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="GstVaapiContext.html" title="GstVaapiContext"><span class="type">GstVaapiContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>composition</code></em> :</span></p></td>
<td>a <span class="type">GstVideoOverlayComposition</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if all composition planes could be applied,
<code class="literal">FALSE</code> otherwise</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GstVaapiContext.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstVaapiContext--entrypoint"></a><h3>The <code class="literal">"entrypoint"</code> property</h3>
<pre class="programlisting">  "entrypoint"               <span class="type">guint</span>                 : Read / Write / Construct Only</pre>
<p>The decoder entrypoint.</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstVaapiContext--height"></a><h3>The <code class="literal">"height"</code> property</h3>
<pre class="programlisting">  "height"                   <span class="type">guint</span>                 : Read / Write / Construct Only</pre>
<p>The height of the decoded surfaces.</p>
<p>Allowed values: &lt;= G_MAXLONG</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstVaapiContext--profile"></a><h3>The <code class="literal">"profile"</code> property</h3>
<pre class="programlisting">  "profile"                  <span class="type">guint</span>                 : Read / Write</pre>
<p>The profile used for decoding.</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstVaapiContext--width"></a><h3>The <code class="literal">"width"</code> property</h3>
<pre class="programlisting">  "width"                    <span class="type">guint</span>                 : Read / Write / Construct Only</pre>
<p>The width of decoded surfaces.</p>
<p>Allowed values: &lt;= G_MAXLONG</p>
<p>Default value: 0</p>
</div>
</div>
</div>
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