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| <a href="#gst-plugins-bad-libs-GstVideoContextInterface.synopsis" class="shortcut">Top</a> |
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| <a href="#gst-plugins-bad-libs-GstVideoContextInterface.description" class="shortcut">Description</a> |
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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> |
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| <div class="refsynopsisdiv"> |
| <a name="gst-plugins-bad-libs-GstVideoContextInterface.synopsis"></a><h2>Synopsis</h2> |
| <pre class="synopsis">#define <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> (obj) |
| <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext">GstVideoContext</a>; |
| struct <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContextInterface" title="struct GstVideoContextInterface">GstVideoContextInterface</a>; |
| <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="returnvalue">GType</span></a> <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> (<em class="parameter"><code><span class="type">void</span></code></em>); |
| <span class="returnvalue">void</span> <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> (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *value</code></em>); |
| <span class="returnvalue">void</span> <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> |
| (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>); |
| <span class="returnvalue">void</span> <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> |
| (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> value</code></em>); |
| <span class="returnvalue">void</span> <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> |
| (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *value</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-prepare" title="gst_video_context_prepare ()">gst_video_context_prepare</a> (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **types</code></em>); |
| <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <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> |
| (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/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>); |
| <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="returnvalue">GstQuery</span></a> * <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> (<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **types</code></em>); |
| <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <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> (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="type">GstElement</span></a> *element</code></em>, |
| <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>); |
| const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> ** <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> |
| (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>); |
| <span class="returnvalue">void</span> <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> (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **type</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> **value</code></em>); |
| <span class="returnvalue">void</span> <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> (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *value</code></em>); |
| <span class="returnvalue">void</span> <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> (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>); |
| <span class="returnvalue">void</span> <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> (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> value</code></em>); |
| <span class="returnvalue">void</span> <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> (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *value</code></em>); |
| </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" style="margin-left: 0.5in; margin-right: 0.5in;"> |
| <h3 class="title">Note</h3> |
| 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> |
| <p> |
| </p> |
| <p> |
| </p> |
| <div class="refsect2"> |
| <a name="idp12748560"></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="http://library.gnome.org/devel/gobject/unstable/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> |
| <p> |
| </p> |
| <p> |
| </p> |
| <div class="refsect2"> |
| <a name="idp12760816"></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" style="margin-left: 0.5in; margin-right: 0.5in;"> |
| <h3 class="title">Note</h3> |
| 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="idp12765312"></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"> |
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| 51</pre></td> |
| <td class="listing_code"><pre class="programlisting"><span class="gtkdoc ppc">#if CLUTTER_WINDOWING_X11</span> |
| <span class="gtkdoc kwb">static</span> GstBusSyncReply |
| <span class="function">on_sync_message</span> <span class="gtkdoc opt">(</span>GstBus <span class="gtkdoc opt">*</span> bus<span class="gtkdoc opt">,</span> GstMessage <span class="gtkdoc opt">*</span> message<span class="gtkdoc opt">,</span> gpointer user_data<span class="gtkdoc opt">)</span> |
| <span class="gtkdoc opt">{</span> |
| Display <span class="gtkdoc opt">*</span>display <span class="gtkdoc opt">=</span> user_data<span class="gtkdoc opt">;</span> |
| GstVideoContext <span class="gtkdoc opt">*</span>context<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc kwb">const</span> gchar <span class="gtkdoc opt">**</span>types<span class="gtkdoc opt">;</span> |
| |
| <span class="keyword">if</span> <span class="gtkdoc opt">(</span><span class="function"><a href="../gst-plugins-bad-libs-1.0/gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-message-parse-prepare">gst_video_context_message_parse_prepare</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">, &</span>types<span class="gtkdoc opt">, &</span>context<span class="gtkdoc opt">)) {</span> |
| gint i<span class="gtkdoc opt">;</span> |
| |
| <span class="keyword">for</span> <span class="gtkdoc opt">(</span>i <span class="gtkdoc opt">=</span> <span class="number">0</span><span class="gtkdoc opt">;</span> types<span class="gtkdoc opt">[</span>i<span class="gtkdoc opt">];</span> i<span class="gtkdoc opt">++) {</span> |
| |
| <span class="keyword">if</span> <span class="gtkdoc opt">(!</span><span class="function">strcmp</span><span class="gtkdoc opt">(</span>types<span class="gtkdoc opt">[</span>i<span class="gtkdoc opt">],</span> <span class="string">"x11-display"</span><span class="gtkdoc opt">)) {</span> |
| <span class="function"><a href="../gst-plugins-bad-libs-1.0/gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-set-context-pointer">gst_video_context_set_context_pointer</a></span> <span class="gtkdoc opt">(</span>context<span class="gtkdoc opt">,</span> <span class="string">"x11-display"</span><span class="gtkdoc opt">,</span> display<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="keyword">else if</span> <span class="gtkdoc opt">(!</span><span class="function">strcmp</span><span class="gtkdoc opt">(</span>types<span class="gtkdoc opt">[</span>i<span class="gtkdoc opt">],</span> <span class="string">"x11-display-name"</span><span class="gtkdoc opt">)) {</span> |
| <span class="function"><a href="../gst-plugins-bad-libs-1.0/gst-plugins-bad-libs-GstVideoContextInterface.html#gst-video-context-set-context-string">gst_video_context_set_context_string</a></span> <span class="gtkdoc opt">(</span>context<span class="gtkdoc opt">,</span> <span class="string">"x11-display-name"</span><span class="gtkdoc opt">,</span> |
| <span class="function">DisplayString</span> <span class="gtkdoc opt">(</span>display<span class="gtkdoc opt">));</span> |
| <span class="gtkdoc opt">}</span> <span class="keyword">else</span> <span class="gtkdoc opt">{</span> |
| <span class="keyword">continue</span><span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span> |
| |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#gst-message-unref">gst_message_unref</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">);</span> |
| <span class="keyword">return</span> GST_BUS_DROP<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="gtkdoc opt">}</span> |
| |
| <span class="keyword">return</span> GST_BUS_PASS<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="gtkdoc ppc">#endif</span> |
| |
| gint |
| <span class="function">main</span> <span class="gtkdoc opt">(</span>gint argc<span class="gtkdoc opt">,</span> gchar <span class="gtkdoc opt">**</span>argv<span class="gtkdoc opt">)</span> |
| <span class="gtkdoc opt">{</span> |
| GstBin <span class="gtkdoc opt">*</span>pipeline<span class="gtkdoc opt">;</span> |
| GstBus <span class="gtkdoc opt">*</span>bus<span class="gtkdoc opt">;</span> |
| |
| <span class="gtkdoc opt">...</span> |
| |
| bus <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPipeline.html#gst-pipeline-get-bus">gst_pipeline_get_bus</a></span> <span class="gtkdoc opt">(</span><span class="function">GST_PIPELINE</span> <span class="gtkdoc opt">(</span>pipeline<span class="gtkdoc opt">));</span> |
| |
| <span class="gtkdoc ppc">#if CLUTTER_WINDOWING_X11</span> |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBus.html#gst-bus-set-sync-handler">gst_bus_set_sync_handler</a></span> <span class="gtkdoc opt">(</span>priv<span class="gtkdoc opt">-></span>bus<span class="gtkdoc opt">,</span> on_sync_message<span class="gtkdoc opt">,</span> |
| <span class="function">clutter_x11_get_default_display</span> <span class="gtkdoc opt">(),</span> NULL<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc ppc">#endif</span> |
| |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html#gst-object-unref">gst_object_unref</a></span> <span class="gtkdoc opt">(</span><span class="function">GST_OBJECT</span> <span class="gtkdoc opt">(</span>priv<span class="gtkdoc opt">-></span>bus<span class="gtkdoc opt">));</span> |
| |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc opt">}</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| |
| </div> |
| </div> |
| <p> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-libs-GstVideoContextInterface.details"></a><h2>Details</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) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_VIDEO_CONTEXT)) |
| </pre> |
| </div> |
| <hr> |
| <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="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GTypeInterface"><span class="type">GTypeInterface</span></a> <em class="structfield"><code><a name="GstVideoContextInterface.parent"></a>parent</code></em>;</span></p></td> |
| <td>parent interface type.</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="structfield"><code><a name="GstVideoContextInterface.set-context"></a>set_context</code></em> ()</span></p></td> |
| <td>vmethod to set video context.</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </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="http://library.gnome.org/devel/gobject/unstable/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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/gobject/unstable/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="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></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>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>the type of display being set</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td> |
| <td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> containing the context</td> |
| </tr> |
| </tbody> |
| </table></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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/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="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>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>the type of display being set</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td> |
| <td>a string representing the video context</td> |
| </tr> |
| </tbody> |
| </table></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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/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" style="margin-left: 0.5in; margin-right: 0.5in;"> |
| <h3 class="title">Note</h3> |
| Users of X11 Display should ensure that <code class="function">XInitThreads()</code> was called before |
| opening the display. |
| </div> |
| <p> |
| </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>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>the type of display being set</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>pointer</code></em> :</span></p></td> |
| <td>a pointer to the video context</td> |
| </tr> |
| </tbody> |
| </table></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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/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="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a>, this helper allow taking |
| benifit of the <a href="http://library.gnome.org/devel/gobject/unstable/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="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>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>the type of display being set</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td> |
| <td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> resenting the display</td> |
| </tr> |
| </tbody> |
| </table></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="http://library.gnome.org/devel/glib/unstable/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="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>an element implementing <a class="link" href="gst-plugins-bad-libs-GstVideoContextInterface.html#GstVideoContext" title="GstVideoContext"><span class="type">GstVideoContext</span></a> interface</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>types</code></em> :</span></p></td> |
| <td>an array of supported types, prefered first</td> |
| </tr> |
| </tbody> |
| </table></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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_video_context_message_parse_prepare |
| (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>types</code></em> :</span></p></td> |
| <td>return value for supported types</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td> |
| <td>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> |
| </td> |
| </tr> |
| </tbody> |
| </table></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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="returnvalue">GstQuery</span></a> * gst_video_context_query_new (<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **types</code></em>);</pre> |
| <p> |
| Create a new custom <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> with structure name "prepare-video-context". |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody><tr> |
| <td><p><span class="term"><em class="parameter"><code>types</code></em> :</span></p></td> |
| <td>a string array of video context types</td> |
| </tr></tbody> |
| </table></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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_video_context_run_query (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="type">GstElement</span></a> *element</code></em>, |
| <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/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="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>element</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="type">GstElement</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> |
| </td> |
| </tr> |
| </tbody> |
| </table></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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> ** gst_video_context_query_get_supported_types |
| (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td>An array of supported video context types</td> |
| </tr> |
| </tbody> |
| </table></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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **type</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/gobject/unstable/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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>return video context type</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td> |
| <td>return video context <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> |
| </td> |
| </tr> |
| </tbody> |
| </table></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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/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="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> inside the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>the video context type</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td> |
| <td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> set with video context</td> |
| </tr> |
| </tbody> |
| </table></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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>the video context type</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td> |
| <td>a string representing the video context</td> |
| </tr> |
| </tbody> |
| </table></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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> inside the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>the video context type</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td> |
| <td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> representing the video context</td> |
| </tr> |
| </tbody> |
| </table></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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> *query</code></em>, |
| <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/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="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> inside the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td> |
| <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td> |
| <td>the video context type</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td> |
| <td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> representing the video context</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
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