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<div class="refentry">
<a name="gst-plugins-bad-libs-GstVideoContextInterface"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-bad-libs-GstVideoContextInterface.top_of_page"></a>GstVideoContextInterface</span></h2>
<p>GstVideoContextInterface — Interface to handle video library context</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-bad-libs-GstVideoContextInterface.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GST-IS-VIDEO-CONTEXT:CAPS" title="GST_IS_VIDEO_CONTEXT()">GST_IS_VIDEO_CONTEXT</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"><span class="returnvalue">GType</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-iface-get-type" title="gst_video_context_iface_get_type ()">gst_video_context_iface_get_type</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-set-context" title="gst_video_context_set_context ()">gst_video_context_set_context</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-set-context-string" title="gst_video_context_set_context_string ()">gst_video_context_set_context_string</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-set-context-pointer" title="gst_video_context_set_context_pointer ()">gst_video_context_set_context_pointer</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-set-context-object" title="gst_video_context_set_context_object ()">gst_video_context_set_context_object</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-prepare" title="gst_video_context_prepare ()">gst_video_context_prepare</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-message-parse-prepare" title="gst_video_context_message_parse_prepare ()">gst_video_context_message_parse_prepare</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="returnvalue">GstQuery</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-query-new" title="gst_video_context_query_new ()">gst_video_context_query_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-run-query" title="gst_video_context_run_query ()">gst_video_context_run_query</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
</td>
<td class="function_name">
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-query-get-supported-types" title="gst_video_context_query_get_supported_types ()">gst_video_context_query_get_supported_types</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-query-parse-value" title="gst_video_context_query_parse_value ()">gst_video_context_query_parse_value</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-query-set-value" title="gst_video_context_query_set_value ()">gst_video_context_query_set_value</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-query-set-string" title="gst_video_context_query_set_string ()">gst_video_context_query_set_string</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-query-set-pointer" title="gst_video_context_query_set_pointer ()">gst_video_context_query_set_pointer</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="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-query-set-object" title="gst_video_context_query_set_object ()">gst_video_context_query_set_object</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-libs-GstVideoContextInterface.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext">GstVideoContext</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContextInterface" title="struct GstVideoContextInterface">GstVideoContextInterface</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-libs-GstVideoContextInterface.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-libs-GstVideoContextInterface.description"></a><h2>Description</h2>
<p>The Video Context interface enable sharing video context (such as display
name, X11 Display, VA-API Display, etc) between neighboor elements and the
application.</p>
<div class="note">
The GstVideoContext interface is unstable API and may change in future.
One can define GST_USE_UNSTABLE_API to acknowledge and avoid this warning.
</div>
<div class="refsect2">
<a name="id-1.2.5.6.6.4"></a><h3>For Element</h3>
<p>
This interface shall be implement by group of elements that need to share
a specific video context (like VDPAU, LibVA, OpenGL elements) or by video
sink in order to let the application select appropriate display information
(like the X11 display name) when those sink are auto-plugged.
</p>
<p>
Along with implementing the interface, elements will need to query
neighboor elements or send message to the application when preparing
the context (see <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-prepare" title="gst_video_context_prepare ()"><code class="function">gst_video_context_prepare()</code></a>). They also need to reply
to the neighboors element queries, so the context can be shared without
the application help.
</p>
<p>
Elements that are guarantied to have both upstream and downstream
neighboors element implementing the <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> (like the gloverlay
element in gst-plugins-opengl) is not required to also implement the
interface. Relying on neighboors query shall be sufficient (see
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-run-query" title="gst_video_context_run_query ()"><code class="function">gst_video_context_run_query()</code></a>).
</p>
<p>
The query is an application query with a structure name set to
"prepare-video-context" and an array of supported video context types set
in the field named "types". This query shall be send downstream and
upstream, iterating the pads in order to find neighboors regardless of a
static (sink to src) or a dynamic (src to sink) activation. Element should
used the helpers method <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-prepare" title="gst_video_context_prepare ()"><code class="function">gst_video_context_prepare()</code></a> (or
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-run-query" title="gst_video_context_run_query ()"><code class="function">gst_video_context_run_query()</code></a> if no GstVideoContext interface) to
correctly execute the query . The result is set using the query helper
functions, the structures fields name being "video-context-type" as
string and "video-context" as a <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a>.
</p>
<p>
If the query is not handled by any neighboor, the element should ask the
application using the "prepare-video-context" message. The application
may then use the interface to set the video context information. If no
context was set, the element shall create one using default configuration.
Elements with multiple src or sink pad shall implement proper locking to
prevent the race of parallel queries being replied.
</p>
<p>
Well known video-context are: "x11-display-name" a string representing the
X11 display to use, "x11-display" the X11 Display structure, "va-display",
the VADisplay structure and more.
</p>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.5.6.6.5"></a><h3>For Application</h3>
<p>
In the case there is no neighboor element with video context to share,
the element will first turn toward the application, by sending a
"prepare-video-context" message. This message is sent along with a list
of supported display types. The application can optionally reply to this
message by calling appropriate setter through the <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a>
interface. If the application supports more then one video context type,
it should choose the first one to occure in the supported list. It's
important to remember that the message is delivered from the streaming
thread, and appropriate locking should be considered. If the application
does not have a video context to share, the element will simply allocate
one base on default settings. Usually, only applications using OpenGL
base sink, or running on special X11 display need to share a video context.
</p>
<div class="note">
Applications sharing X11 Display structure should always initialize the
X11 threading support using <code class="function">XInitThreads()</code> as GStreamer will need to
manipulate the display from a separeate threads.
</div>
<p>
</p>
<div class="refsect2">
<a name="id-1.2.5.6.6.5.3"></a><h3>Example using ClutterVideoGstVideoSink</h3>
<p>
This example is for user of ClutterGstVideoSink element, the
ClutterGstPlayer object transparently handle this.
</p>
<div class="informalexample"><pre class="programlisting">
#if CLUTTER_WINDOWING_X11
static GstBusSyncReply
on_sync_message (GstBus * bus, GstMessage * message, gpointer user_data)
{
Display *display = user_data;
GstVideoContext *context;
const gchar **types;
if (gst_video_context_message_parse_prepare (message, &types, &context)) {
gint i;
for (i = 0; types[i]; i++) {
if (!strcmp(types[i], "x11-display")) {
gst_video_context_set_context_pointer (context, "x11-display", display);
}
else if (!strcmp(types[i], "x11-display-name")) {
gst_video_context_set_context_string (context, "x11-display-name",
DisplayString (display));
} else {
continue;
}
gst_message_unref (message);
return GST_BUS_DROP;
}
}
return GST_BUS_PASS;
}
#endif
gint
main (gint argc, gchar **argv)
{
GstBin *pipeline;
GstBus *bus;
...
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
#if CLUTTER_WINDOWING_X11
gst_bus_set_sync_handler (priv->bus, on_sync_message,
clutter_x11_get_default_display ());
#endif
gst_object_unref (GST_OBJECT (priv->bus));
...
}
</pre></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-libs-GstVideoContextInterface.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="GST-IS-VIDEO-CONTEXT:CAPS"></a><h3>GST_IS_VIDEO_CONTEXT()</h3>
<pre class="programlisting">#define GST_IS_VIDEO_CONTEXT(obj) (GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_VIDEO_CONTEXT))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-iface-get-type"></a><h3>gst_video_context_iface_get_type ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"><span class="returnvalue">GType</span></a>
gst_video_context_iface_get_type (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-set-context"></a><h3>gst_video_context_set_context ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_set_context (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> *context</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *value</code></em>);</pre>
<p>This is a wrapper for the <code class="function">set_context()</code> virtual method. It is suggested to
use one of the helpers to avoid having to manipulate <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a></p>
<div class="refsect3">
<a name="id-1.2.5.6.7.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>context</p></td>
<td class="parameter_description"><p>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the type of display being set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> containing the context</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-set-context-string"></a><h3>gst_video_context_set_context_string ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_set_context_string (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> *context</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);</pre>
<p>This helper is commonly used for setting video context represented by a
string like the X11 display name ("x11-display-name")/</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>context</p></td>
<td class="parameter_description"><p>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the type of display being set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>string</p></td>
<td class="parameter_description"><p>a string representing the video context</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-set-context-pointer"></a><h3>gst_video_context_set_context_pointer ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_set_context_pointer (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> *context</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> value</code></em>);</pre>
<p>This helper is used for setting video context using a pointer, typically to
a structure like the X11 Display ("x11-display") or the VADisplay
("vaapi-display").</p>
<div class="note">
Users of X11 Display should ensure that <code class="function">XInitThreads()</code> was called before
opening the display.
</div>
<div class="refsect3">
<a name="id-1.2.5.6.7.6.6"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>context</p></td>
<td class="parameter_description"><p>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the type of display being set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pointer</p></td>
<td class="parameter_description"><p>a pointer to the video context</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-set-context-object"></a><h3>gst_video_context_set_context_object ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_set_context_object (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> *context</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *value</code></em>);</pre>
<p>This is for video context that are <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a>, this helper allow taking
benifit of the <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> refcounting. It is particularly handy for element
to have refcounting as the order in which element will stop using the
display is not defined.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>context</p></td>
<td class="parameter_description"><p>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the type of display being set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>object</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> resenting the display</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-prepare"></a><h3>gst_video_context_prepare ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_prepare (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> *context</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **types</code></em>);</pre>
<p>This method run "prepare-video-context" custom query dowstream, and
upstream. If * the query has a reply, it sets the context value using
<a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-set-context" title="gst_video_context_set_context ()"><code class="function">gst_video_context_set_context()</code></a>. Otherwise, it sends a
"prepare-video-context" message to the application. The element can then
continue video context initialization.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>context</p></td>
<td class="parameter_description"><p>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> interface</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>types</p></td>
<td class="parameter_description"><p>an array of supported types, prefered first</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-message-parse-prepare"></a><h3>gst_video_context_message_parse_prepare ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_video_context_message_parse_prepare
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> ***types</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> **ctx</code></em>);</pre>
<p>This helper shall be used by application to simply handling of the
"prepare-video-context" message.</p>
<p>Rerturns: <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a> is the message was not valid "prepare-video-context"
element message, otherwise <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a> with <em class="parameter"><code>types</code></em>
and <em class="parameter"><code>context</code></em>
set.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.9.6"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>message</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>types</p></td>
<td class="parameter_description"><p>return value for supported types</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>context</p></td>
<td class="parameter_description"><p>return value for the element the implements <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-query-new"></a><h3>gst_video_context_query_new ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="returnvalue">GstQuery</span></a> *
gst_video_context_query_new (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **types</code></em>);</pre>
<p>Create a new custom <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> with structure name "prepare-video-context".</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.10.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>types</p></td>
<td class="parameter_description"><p>a string array of video context types</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-run-query"></a><h3>gst_video_context_run_query ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_video_context_run_query (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>This helper runs the query on each downstream, then upstream pads in an
element. This is called by <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-prepare" title="gst_video_context_prepare ()"><code class="function">gst_video_context_prepare()</code></a>. This method is only
used directly within elements that are required to have two neighboors
elements with appropriate video context. This would be the case of
specialized filters that only manipulate non-raw buffers (e.g.
gldeinterlace). Those elements do not have to implement <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a>
interface.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.11.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>element</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-query-get-supported-types"></a><h3>gst_video_context_query_get_supported_types ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
gst_video_context_query_get_supported_types
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<div class="refsect3">
<a name="id-1.2.5.6.7.12.4"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.6.7.12.5"></a><h4>Returns</h4>
<p> An array of supported video context types</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-query-parse-value"></a><h3>gst_video_context_query_parse_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_query_parse_value (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **type</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> **value</code></em>);</pre>
<p>Helper to extract the video context type and value from a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.13.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>return video context type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>return video context <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-query-set-value"></a><h3>gst_video_context_query_set_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_query_set_value (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *value</code></em>);</pre>
<p>Helper to set the video context as a <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> inside the <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.14.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the video context type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> set with video context</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-query-set-string"></a><h3>gst_video_context_query_set_string ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_query_set_string (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);</pre>
<p>Helper to set the video context as a string inside the <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.15.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the video context type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a string representing the video context</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-query-set-pointer"></a><h3>gst_video_context_query_set_pointer ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_query_set_pointer (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> value</code></em>);</pre>
<p>Helper to set the video context as a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> inside the <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.16.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the video context type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> representing the video context</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-context-query-set-object"></a><h3>gst_video_context_query_set_object ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_context_query_set_object (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *value</code></em>);</pre>
<p>Helper to set the video context as a <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> inside the <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.6.7.17.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the video context type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> representing the video context</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-libs-GstVideoContextInterface.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstVideoContext"></a><h3>GstVideoContext</h3>
<pre class="programlisting">typedef struct _GstVideoContext GstVideoContext;</pre>
<p>Opaque <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> data structure.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstVideoContextInterface"></a><h3>struct GstVideoContextInterface</h3>
<pre class="programlisting">struct GstVideoContextInterface {
GTypeInterface parent;
/* virtual functions */
void (*set_context) (GstVideoContext * context,
const gchar * type,
const GValue * value);
};
</pre>
<p><a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContextInterface" title="struct GstVideoContextInterface"><span class="type">GstVideoContextInterface</span></a> interface.</p>
<div class="refsect3">
<a name="id-1.2.5.6.8.3.5"></a><h4>Members</h4>
<div class="informaltable"><table 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><a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GTypeInterface"><span class="type">GTypeInterface</span></a> <em class="structfield"><code><a name="GstVideoContextInterface.parent"></a>parent</code></em>;</p></td>
<td class="struct_member_description"><p>parent interface type.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoContextInterface.set-context"></a>set_context</code></em> ()</p></td>
<td class="struct_member_description"><p>vmethod to set video context.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
</div>
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