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| <tr><td colspan="5" class="shortcuts"> |
| <a href="#gst-plugins-base-libs-gstvideooverlay.synopsis" class="shortcut">Top</a> |
| | |
| <a href="#gst-plugins-base-libs-gstvideooverlay.description" class="shortcut">Description</a> |
| | |
| <a href="#gst-plugins-base-libs-gstvideooverlay.object-hierarchy" class="shortcut">Object Hierarchy</a> |
| </td></tr> |
| </table> |
| <div class="refentry"> |
| <a name="gst-plugins-base-libs-gstvideooverlay"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstvideooverlay.top_of_page"></a>gstvideooverlay</span></h2> |
| <p>gstvideooverlay — Interface for setting/getting a window system resource |
| on elements supporting it to configure a window into which to render a |
| video.</p> |
| </td> |
| <td valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsynopsisdiv"> |
| <a name="gst-plugins-base-libs-gstvideooverlay.synopsis"></a><h2>Synopsis</h2> |
| <a name="GstVideoOverlay"></a><pre class="synopsis"> |
| #include <gst/video/videooverlay.h> |
| |
| <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay-struct" title="GstVideoOverlay">GstVideoOverlay</a>; |
| struct <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlayInterface" title="struct GstVideoOverlayInterface">GstVideoOverlayInterface</a>; |
| <span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-got-window-handle" title="gst_video_overlay_got_window_handle ()">gst_video_overlay_got_window_handle</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>, |
| <em class="parameter"><code><span class="type">guintptr</span> handle</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-set-window-handle" title="gst_video_overlay_set_window_handle ()">gst_video_overlay_set_window_handle</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>, |
| <em class="parameter"><code><span class="type">guintptr</span> handle</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-prepare-window-handle" title="gst_video_overlay_prepare_window_handle ()">gst_video_overlay_prepare_window_handle</a> |
| (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-expose" title="gst_video_overlay_expose ()">gst_video_overlay_expose</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-handle-events" title="gst_video_overlay_handle_events ()">gst_video_overlay_handle_events</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> handle_events</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-base-libs-gstvideooverlay.html#gst-video-overlay-set-render-rectangle" title="gst_video_overlay_set_render_rectangle ()">gst_video_overlay_set_render_rectangle</a> |
| (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> x</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> y</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</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-base-libs-gstvideooverlay.html#gst-is-video-overlay-prepare-window-handle-message" title="gst_is_video_overlay_prepare_window_handle_message ()">gst_is_video_overlay_prepare_window_handle_message</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> *msg</code></em>); |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstvideooverlay.object-hierarchy"></a><h2>Object Hierarchy</h2> |
| <pre class="synopsis"> |
| GInterface |
| +----GstVideoOverlay |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstvideooverlay.description"></a><h2>Description</h2> |
| <p> |
| </p> |
| <div class="refsect2"> |
| <a name="idp27703680"></a><p> |
| The <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> interface is used for 2 main purposes : |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"><p> |
| To get a grab on the Window where the video sink element is going to render. |
| This is achieved by either being informed about the Window identifier that |
| the video sink element generated, or by forcing the video sink element to use |
| a specific Window identifier for rendering. |
| </p></li> |
| <li class="listitem"><p> |
| To force a redrawing of the latest video frame the video sink element |
| displayed on the Window. Indeed if the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPipeline.html"><span class="type">GstPipeline</span></a> is in <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#GST-STATE-PAUSED:CAPS"><span class="type">GST_STATE_PAUSED</span></a> |
| state, moving the Window around will damage its content. Application |
| developers will want to handle the Expose events themselves and force the |
| video sink element to refresh the Window's content. |
| </p></li> |
| </ul></div> |
| <p> |
| </p> |
| <p> |
| Using the Window created by the video sink is probably the simplest scenario, |
| in some cases, though, it might not be flexible enough for application |
| developers if they need to catch events such as mouse moves and button |
| clicks. |
| </p> |
| <p> |
| Setting a specific Window identifier on the video sink element is the most |
| flexible solution but it has some issues. Indeed the application needs to set |
| its Window identifier at the right time to avoid internal Window creation |
| from the video sink element. To solve this issue a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> is posted on |
| the bus to inform the application that it should set the Window identifier |
| immediately. Here is an example on how to do that correctly: |
| </p> |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1 |
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| 32</pre></td> |
| <td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwb">static</span> GstBusSyncReply |
| <span class="function">create_window</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> GstPipeline <span class="gtkdoc opt">*</span> pipeline<span class="gtkdoc opt">)</span> |
| <span class="gtkdoc opt">{</span> |
| <span class="gtkdoc slc">// ignore anything but 'prepare-window-handle' element messages</span> |
| <span class="keyword">if</span> <span class="gtkdoc opt">(!</span><span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideooverlay.html#gst-is-video-overlay-prepare-window-handle-message">gst_is_video_overlay_prepare_window_handle_message</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">))</span> |
| <span class="keyword">return</span> GST_BUS_PASS<span class="gtkdoc opt">;</span> |
| |
| win <span class="gtkdoc opt">=</span> <span class="function">XCreateSimpleWindow</span> <span class="gtkdoc opt">(</span>disp<span class="gtkdoc opt">,</span> root<span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">320</span><span class="gtkdoc opt">,</span> <span class="number">240</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">);</span> |
| |
| <span class="function">XSetWindowBackgroundPixmap</span> <span class="gtkdoc opt">(</span>disp<span class="gtkdoc opt">,</span> win<span class="gtkdoc opt">,</span> None<span class="gtkdoc opt">);</span> |
| |
| <span class="function">XMapRaised</span> <span class="gtkdoc opt">(</span>disp<span class="gtkdoc opt">,</span> win<span class="gtkdoc opt">);</span> |
| |
| <span class="function">XSync</span> <span class="gtkdoc opt">(</span>disp<span class="gtkdoc opt">,</span> FALSE<span class="gtkdoc opt">);</span> |
| |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-set-window-handle">gst_video_overlay_set_window_handle</a></span> <span class="gtkdoc opt">(</span><span class="function">GST_VIDEO_OVERLAY</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-SRC:CAPS">GST_MESSAGE_SRC</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">)),</span> |
| win<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="gtkdoc kwb">int</span> |
| <span class="function">main</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">int</span> argc<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">char</span> <span class="gtkdoc opt">**</span>argv<span class="gtkdoc opt">)</span> |
| <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="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>bus<span class="gtkdoc opt">, (</span>GstBusSyncHandler<span class="gtkdoc opt">)</span> create_window<span class="gtkdoc opt">,</span> pipeline<span class="gtkdoc opt">,</span> |
| NULL<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc opt">}</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| |
| <p> |
| </p> |
| </div> |
| <p> |
| </p> |
| <hr> |
| <div class="refsect2"> |
| <a name="idp29094384"></a><h3>Two basic usage scenarios</h3> |
| <p> |
| There are two basic usage scenarios: in the simplest case, the application |
| knows exactly what particular element is used for video output, which is |
| usually the case when the application creates the videosink to use |
| (e.g. <span class="type">xvimagesink</span>, <span class="type">ximagesink</span>, etc.) itself; in this case, the application |
| can just create the videosink element, create and realize the window to |
| render the video on and then call <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-set-window-handle" title="gst_video_overlay_set_window_handle ()"><code class="function">gst_video_overlay_set_window_handle()</code></a> directly |
| with the XID or native window handle, before starting up the pipeline. |
| </p> |
| <p> |
| In the other and more common case, the application does not know in advance |
| what GStreamer video sink element will be used for video output. This is |
| usually the case when an element such as <span class="type">autovideosink</span> or <span class="type">gconfvideosink</span> |
| is used. In this case, the video sink element itself is created |
| asynchronously from a GStreamer streaming thread some time after the |
| pipeline has been started up. When that happens, however, the video sink |
| will need to know right then whether to render onto an already existing |
| application window or whether to create its own window. This is when it |
| posts a prepare-window-handle message, and that is also why this message needs |
| to be handled in a sync bus handler which will be called from the streaming |
| thread directly (because the video sink will need an answer right then). |
| </p> |
| <p> |
| As response to the prepare-window-handle element message in the bus sync |
| handler, the application may use <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-set-window-handle" title="gst_video_overlay_set_window_handle ()"><code class="function">gst_video_overlay_set_window_handle()</code></a> to tell |
| the video sink to render onto an existing window surface. At this point the |
| application should already have obtained the window handle / XID, so it |
| just needs to set it. It is generally not advisable to call any GUI toolkit |
| functions or window system functions from the streaming thread in which the |
| prepare-window-handle message is handled, because most GUI toolkits and |
| windowing systems are not thread-safe at all and a lot of care would be |
| required to co-ordinate the toolkit and window system calls of the |
| different threads (Gtk+ users please note: prior to Gtk+ 2.18 |
| <a href="http://developer.gnome.org/devel/gdk/gdk3-X-Window-System-Interaction.html#GDK-WINDOW-XID:CAPS"><code class="function">GDK_WINDOW_XID()</code></a> was just a simple structure access, so generally fine to do |
| within the bus sync handler; this macro was changed to a function call in |
| Gtk+ 2.18 and later, which is likely to cause problems when called from a |
| sync handler; see below for a better approach without <a href="http://developer.gnome.org/devel/gdk/gdk3-X-Window-System-Interaction.html#GDK-WINDOW-XID:CAPS"><code class="function">GDK_WINDOW_XID()</code></a> |
| used in the callback). |
| </p> |
| </div> |
| <p> |
| </p> |
| <hr> |
| <div class="refsect2"> |
| <a name="idp29106544"></a><h3>GstVideoOverlay and Gtk+</h3> |
| <p> |
| </p> |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
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| 96</pre></td> |
| <td class="listing_code"><pre class="programlisting"><span class="gtkdoc ppc">#include <gst/video/videooverlay.h></span> |
| <span class="gtkdoc ppc">#include <gtk/gtk.h></span> |
| <span class="gtkdoc ppc">#ifdef GDK_WINDOWING_X11</span> |
| <span class="gtkdoc ppc">#include <gdk/gdkx.h></span> <span class="gtkdoc slc">// for GDK_WINDOW_XID</span> |
| <span class="gtkdoc ppc"></span><span class="gtkdoc ppc">#endif</span> |
| <span class="gtkdoc ppc">#ifdef GDK_WINDOWING_WIN32</span> |
| <span class="gtkdoc ppc">#include <gdk/gdkwin32.h></span> <span class="gtkdoc slc">// for GDK_WINDOW_HWND</span> |
| <span class="gtkdoc ppc"></span><span class="gtkdoc ppc">#endif</span> |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc kwb">static</span> guintptr video_window_handle <span class="gtkdoc opt">=</span> <span class="number">0</span><span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc kwb">static</span> GstBusSyncReply |
| <span class="function">bus_sync_handler</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> |
| <span class="gtkdoc slc">// ignore anything but 'prepare-window-handle' element messages</span> |
| <span class="keyword">if</span> <span class="gtkdoc opt">(!</span><span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideooverlay.html#gst-is-video-overlay-prepare-window-handle-message">gst_is_video_overlay_prepare_window_handle_message</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">))</span> |
| <span class="keyword">return</span> GST_BUS_PASS<span class="gtkdoc opt">;</span> |
| |
| <span class="keyword">if</span> <span class="gtkdoc opt">(</span>video_window_handle <span class="gtkdoc opt">!=</span> <span class="number">0</span><span class="gtkdoc opt">) {</span> |
| GstVideoOverlay <span class="gtkdoc opt">*</span>overlay<span class="gtkdoc opt">;</span> |
| |
| <span class="gtkdoc slc">// GST_MESSAGE_SRC (message) will be the video sink element</span> |
| overlay <span class="gtkdoc opt">=</span> <span class="function">GST_VIDEO_OVERLAY</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-SRC:CAPS">GST_MESSAGE_SRC</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">));</span> |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-set-window-handle">gst_video_overlay_set_window_handle</a></span> <span class="gtkdoc opt">(</span>overlay<span class="gtkdoc opt">,</span> video_window_handle<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">}</span> <span class="keyword">else</span> <span class="gtkdoc opt">{</span> |
| <span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Message-Logging.html#g-warning">g_warning</a></span> <span class="gtkdoc opt">(</span><span class="string">"Should have obtained video_window_handle by now!"</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="gtkdoc kwb">static void</span> |
| <span class="function">video_widget_realize_cb</span> <span class="gtkdoc opt">(</span>GtkWidget <span class="gtkdoc opt">*</span> widget<span class="gtkdoc opt">,</span> gpointer data<span class="gtkdoc opt">)</span> |
| <span class="gtkdoc opt">{</span> |
| <span class="gtkdoc ppc">#if GTK_CHECK_VERSION(2,18,0)</span> |
| <span class="gtkdoc slc">// Tell Gtk+/Gdk to create a native window for this widget instead of</span> |
| <span class="gtkdoc slc">// drawing onto the parent widget.</span> |
| <span class="gtkdoc slc">// This is here just for pedagogical purposes, GDK_WINDOW_XID will call</span> |
| <span class="gtkdoc slc">// it as well in newer Gtk versions</span> |
| <span class="keyword">if</span> <span class="gtkdoc opt">(!</span><span class="function"><a href="http://developer.gnome.org/devel/gdk/gdk3-Windows.html#gdk-window-ensure-native">gdk_window_ensure_native</a></span> <span class="gtkdoc opt">(</span>widget<span class="gtkdoc opt">-></span>window<span class="gtkdoc opt">))</span> |
| <span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Message-Logging.html#g-error">g_error</a></span> <span class="gtkdoc opt">(</span><span class="string">"Couldn't create native window needed for GstVideoOverlay!"</span><span class="gtkdoc opt">);</span> |
| <span class="gtkdoc ppc">#endif</span> |
| |
| <span class="gtkdoc ppc">#ifdef GDK_WINDOWING_X11</span> |
| <span class="gtkdoc opt">{</span> |
| gulong xid <span class="gtkdoc opt">=</span> <span class="function"><a href="http://developer.gnome.org/devel/gdk/gdk3-X-Window-System-Interaction.html#GDK-WINDOW-XID:CAPS">GDK_WINDOW_XID</a></span> <span class="gtkdoc opt">(</span><span class="function"><a href="http://developer.gnome.org/devel/gtk/GtkWidget.html#gtk-widget-get-window">gtk_widget_get_window</a></span> <span class="gtkdoc opt">(</span>video_window<span class="gtkdoc opt">));</span> |
| video_window_handle <span class="gtkdoc opt">=</span> xid<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="gtkdoc ppc">#endif</span> |
| <span class="gtkdoc ppc">#ifdef GDK_WINDOWING_WIN32</span> |
| <span class="gtkdoc opt">{</span> |
| HWND wnd <span class="gtkdoc opt">=</span> <span class="function">GDK_WINDOW_HWND</span> <span class="gtkdoc opt">(</span><span class="function"><a href="http://developer.gnome.org/devel/gtk/GtkWidget.html#gtk-widget-get-window">gtk_widget_get_window</a></span> <span class="gtkdoc opt">(</span>video_window<span class="gtkdoc opt">));</span> |
| video_window_handle <span class="gtkdoc opt">= (</span>guintptr<span class="gtkdoc opt">)</span> wnd<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="gtkdoc ppc">#endif</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc kwb">int</span> |
| <span class="function">main</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">int</span> argc<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">char</span> <span class="gtkdoc opt">**</span>argv<span class="gtkdoc opt">)</span> |
| <span class="gtkdoc opt">{</span> |
| GtkWidget <span class="gtkdoc opt">*</span>video_window<span class="gtkdoc opt">;</span> |
| GtkWidget <span class="gtkdoc opt">*</span>app_window<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">...</span> |
| app_window <span class="gtkdoc opt">=</span> <span class="function"><a href="http://developer.gnome.org/devel/gtk/GtkWindow.html#gtk-window-new">gtk_window_new</a></span> <span class="gtkdoc opt">(</span>GTK_WINDOW_TOPLEVEL<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">...</span> |
| video_window <span class="gtkdoc opt">=</span> <span class="function"><a href="http://developer.gnome.org/devel/gtk/GtkDrawingArea.html#gtk-drawing-area-new">gtk_drawing_area_new</a></span> <span class="gtkdoc opt">();</span> |
| <span class="function"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#g-signal-connect">g_signal_connect</a></span> <span class="gtkdoc opt">(</span>video_window<span class="gtkdoc opt">,</span> <span class="string">"realize"</span><span class="gtkdoc opt">,</span> |
| <span class="function"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span> <span class="gtkdoc opt">(</span>video_widget_realize_cb<span class="gtkdoc opt">),</span> NULL<span class="gtkdoc opt">);</span> |
| <span class="function"><a href="http://developer.gnome.org/devel/gtk/GtkWidget.html#gtk-widget-set-double-buffered">gtk_widget_set_double_buffered</a></span> <span class="gtkdoc opt">(</span>video_window<span class="gtkdoc opt">,</span> FALSE<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc slc">// usually the video_window will not be directly embedded into the</span> |
| <span class="gtkdoc slc">// application window like this, but there will be many other widgets</span> |
| <span class="gtkdoc slc">// and the video window will be embedded in one of them instead</span> |
| <span class="function"><a href="http://developer.gnome.org/devel/gtk/GtkContainer.html#gtk-container-add">gtk_container_add</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_CONTAINER</span> <span class="gtkdoc opt">(</span>ap_window<span class="gtkdoc opt">),</span> video_window<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc slc">// show the GUI</span> |
| <span class="function"><a href="http://developer.gnome.org/devel/gtk/GtkWidget.html#gtk-widget-show-all">gtk_widget_show_all</a></span> <span class="gtkdoc opt">(</span>app_window<span class="gtkdoc opt">);</span> |
| |
| <span class="gtkdoc slc">// realize window now so that the video window gets created and we can</span> |
| <span class="gtkdoc slc">// obtain its XID/HWND before the pipeline is started up and the videosink</span> |
| <span class="gtkdoc slc">// asks for the XID/HWND of the window to render onto</span> |
| <span class="function"><a href="http://developer.gnome.org/devel/gtk/GtkWidget.html#gtk-widget-realize">gtk_widget_realize</a></span> <span class="gtkdoc opt">(</span>video_window<span class="gtkdoc opt">);</span> |
| |
| <span class="gtkdoc slc">// we should have the XID/HWND now</span> |
| <span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Testing.html#g-assert">g_assert</a></span> <span class="gtkdoc opt">(</span>video_window_handle <span class="gtkdoc opt">!=</span> <span class="number">0</span><span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc slc">// set up sync handler for setting the xid once the pipeline is started</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="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>bus<span class="gtkdoc opt">, (</span>GstBusSyncHandler<span class="gtkdoc opt">)</span> bus_sync_handler<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">,</span> |
| NULL<span class="gtkdoc opt">);</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>bus<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/GstElement.html#gst-element-set-state">gst_element_set_state</a></span> <span class="gtkdoc opt">(</span>pipeline<span class="gtkdoc opt">,</span> GST_STATE_PLAYING<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">...</span> |
| <span class="gtkdoc opt">}</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| |
| <p> |
| </p> |
| </div> |
| <p> |
| </p> |
| <hr> |
| <div class="refsect2"> |
| <a name="idp27713008"></a><h3>GstVideoOverlay and Qt</h3> |
| <p> |
| </p> |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1 |
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| 53</pre></td> |
| <td class="listing_code"><pre class="programlisting"><span class="gtkdoc ppc">#include <glib.h></span> |
| <span class="gtkdoc ppc">#include <gst/gst.h></span> |
| <span class="gtkdoc ppc">#include <gst/video/videooverlay.h></span> |
| |
| <span class="gtkdoc ppc">#include <QApplication></span> |
| <span class="gtkdoc ppc">#include <QTimer></span> |
| <span class="gtkdoc ppc">#include <QWidget></span> |
| |
| <span class="gtkdoc kwb">int</span> <span class="function">main</span><span class="gtkdoc opt">(</span><span class="gtkdoc kwb">int</span> argc<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">char</span> <span class="gtkdoc opt">*</span>argv<span class="gtkdoc opt">[])</span> |
| <span class="gtkdoc opt">{</span> |
| <span class="keyword">if</span> <span class="gtkdoc opt">(!</span><span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Deprecated-Thread-APIs.html#g-thread-supported">g_thread_supported</a></span> <span class="gtkdoc opt">())</span> |
| <span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Deprecated-Thread-APIs.html#g-thread-init">g_thread_init</a></span> <span class="gtkdoc opt">(</span>NULL<span class="gtkdoc opt">);</span> |
| |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-Gst.html#gst-init">gst_init</a></span> <span class="gtkdoc opt">(&</span>argc<span class="gtkdoc opt">, &</span>argv<span class="gtkdoc opt">);</span> |
| QApplication <span class="function">app</span><span class="gtkdoc opt">(</span>argc<span class="gtkdoc opt">,</span> argv<span class="gtkdoc opt">);</span> |
| app<span class="gtkdoc opt">.</span><span class="function">connect</span><span class="gtkdoc opt">(&</span>app<span class="gtkdoc opt">,</span> <span class="function">SIGNAL</span><span class="gtkdoc opt">(</span><span class="function">lastWindowClosed</span><span class="gtkdoc opt">()), &</span>app<span class="gtkdoc opt">,</span> <span class="function">SLOT</span><span class="gtkdoc opt">(</span><span class="function">quit</span> <span class="gtkdoc opt">()));</span> |
| |
| <span class="gtkdoc slc">// prepare the pipeline</span> |
| |
| GstElement <span class="gtkdoc opt">*</span>pipeline <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPipeline.html#gst-pipeline-new">gst_pipeline_new</a></span> <span class="gtkdoc opt">(</span><span class="string">"xvoverlay"</span><span class="gtkdoc opt">);</span> |
| GstElement <span class="gtkdoc opt">*</span>src <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElementFactory.html#gst-element-factory-make">gst_element_factory_make</a></span> <span class="gtkdoc opt">(</span><span class="string">"videotestsrc"</span><span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span> |
| GstElement <span class="gtkdoc opt">*</span>sink <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElementFactory.html#gst-element-factory-make">gst_element_factory_make</a></span> <span class="gtkdoc opt">(</span><span class="string">"xvimagesink"</span><span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span> |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBin.html#gst-bin-add-many">gst_bin_add_many</a></span> <span class="gtkdoc opt">(</span><span class="function">GST_BIN</span> <span class="gtkdoc opt">(</span>pipeline<span class="gtkdoc opt">),</span> src<span class="gtkdoc opt">,</span> sink<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span> |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-link">gst_element_link</a></span> <span class="gtkdoc opt">(</span>src<span class="gtkdoc opt">,</span> sink<span class="gtkdoc opt">);</span> |
| |
| <span class="gtkdoc slc">// prepare the ui</span> |
| |
| QWidget window<span class="gtkdoc opt">;</span> |
| window<span class="gtkdoc opt">.</span><span class="function">resize</span><span class="gtkdoc opt">(</span><span class="number">320</span><span class="gtkdoc opt">,</span> <span class="number">240</span><span class="gtkdoc opt">);</span> |
| window<span class="gtkdoc opt">.</span><span class="function">show</span><span class="gtkdoc opt">();</span> |
| |
| WId xwinid <span class="gtkdoc opt">=</span> window<span class="gtkdoc opt">.</span><span class="function">winId</span><span class="gtkdoc opt">();</span> |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-set-window-handle">gst_video_overlay_set_window_handle</a></span> <span class="gtkdoc opt">(</span><span class="function">GST_VIDEO_OVERLAY</span> <span class="gtkdoc opt">(</span>sink<span class="gtkdoc opt">),</span> xwinid<span class="gtkdoc opt">);</span> |
| |
| <span class="gtkdoc slc">// run the pipeline</span> |
| |
| GstStateChangeReturn sret <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-set-state">gst_element_set_state</a></span> <span class="gtkdoc opt">(</span>pipeline<span class="gtkdoc opt">,</span> |
| GST_STATE_PLAYING<span class="gtkdoc opt">);</span> |
| <span class="keyword">if</span> <span class="gtkdoc opt">(</span>sret <span class="gtkdoc opt">==</span> GST_STATE_CHANGE_FAILURE<span class="gtkdoc opt">) {</span> |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-set-state">gst_element_set_state</a></span> <span class="gtkdoc opt">(</span>pipeline<span class="gtkdoc opt">,</span> GST_STATE_NULL<span class="gtkdoc opt">);</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>pipeline<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc slc">// Exit application</span> |
| QTimer<span class="gtkdoc opt">::</span><span class="function">singleShot</span><span class="gtkdoc opt">(</span><span class="number">0</span><span class="gtkdoc opt">,</span> QApplication<span class="gtkdoc opt">::</span><span class="function">activeWindow</span><span class="gtkdoc opt">(),</span> <span class="function">SLOT</span><span class="gtkdoc opt">(</span><span class="function">quit</span><span class="gtkdoc opt">()));</span> |
| <span class="gtkdoc opt">}</span> |
| |
| <span class="gtkdoc kwb">int</span> ret <span class="gtkdoc opt">=</span> app<span class="gtkdoc opt">.</span><span class="function">exec</span><span class="gtkdoc opt">();</span> |
| |
| window<span class="gtkdoc opt">.</span><span class="function">hide</span><span class="gtkdoc opt">();</span> |
| <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-set-state">gst_element_set_state</a></span> <span class="gtkdoc opt">(</span>pipeline<span class="gtkdoc opt">,</span> GST_STATE_NULL<span class="gtkdoc opt">);</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>pipeline<span class="gtkdoc opt">);</span> |
| |
| <span class="keyword">return</span> ret<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| |
| <p> |
| </p> |
| </div> |
| <p> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstvideooverlay.details"></a><h2>Details</h2> |
| <div class="refsect2"> |
| <a name="GstVideoOverlay-struct"></a><h3>GstVideoOverlay</h3> |
| <pre class="programlisting">typedef struct _GstVideoOverlay GstVideoOverlay;</pre> |
| <p> |
| Opaque <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> interface structure |
| </p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoOverlayInterface"></a><h3>struct GstVideoOverlayInterface</h3> |
| <pre class="programlisting">struct GstVideoOverlayInterface { |
| GTypeInterface iface; |
| |
| /* virtual functions */ |
| void (*expose) (GstVideoOverlay *overlay); |
| |
| void (*handle_events) (GstVideoOverlay *overlay, gboolean handle_events); |
| |
| void (*set_render_rectangle) (GstVideoOverlay *overlay, |
| gint x, gint y, |
| gint width, gint height); |
| |
| void (*set_window_handle) (GstVideoOverlay *overlay, guintptr handle); |
| }; |
| </pre> |
| <p> |
| <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</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="GstVideoOverlayInterface.iface"></a>iface</code></em>;</span></p></td> |
| <td>parent interface type.</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="structfield"><code><a name="GstVideoOverlayInterface.expose"></a>expose</code></em> ()</span></p></td> |
| <td>virtual method to handle expose events</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="structfield"><code><a name="GstVideoOverlayInterface.handle-events"></a>handle_events</code></em> ()</span></p></td> |
| <td>virtual method to handle events</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="structfield"><code><a name="GstVideoOverlayInterface.set-render-rectangle"></a>set_render_rectangle</code></em> ()</span></p></td> |
| <td>virtual method to set the render rectangle</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="structfield"><code><a name="GstVideoOverlayInterface.set-window-handle"></a>set_window_handle</code></em> ()</span></p></td> |
| <td>virtual method to configure the window handle</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-overlay-got-window-handle"></a><h3>gst_video_overlay_got_window_handle ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> gst_video_overlay_got_window_handle (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>, |
| <em class="parameter"><code><span class="type">guintptr</span> handle</code></em>);</pre> |
| <p> |
| This will post a "have-window-handle" element message on the bus. |
| </p> |
| <p> |
| This function should only be used by video overlay plugin developers. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>overlay</code></em> :</span></p></td> |
| <td>a <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> which got a window</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>handle</code></em> :</span></p></td> |
| <td>a platform-specific handle referencing the window</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-overlay-set-window-handle"></a><h3>gst_video_overlay_set_window_handle ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> gst_video_overlay_set_window_handle (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>, |
| <em class="parameter"><code><span class="type">guintptr</span> handle</code></em>);</pre> |
| <p> |
| This will call the video overlay's set_window_handle method. You |
| should use this method to tell to an overlay to display video output to a |
| specific window (e.g. an XWindow on X11). Passing 0 as the <em class="parameter"><code>handle</code></em> will |
| tell the overlay to stop using that window and create an internal one. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>overlay</code></em> :</span></p></td> |
| <td>a <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> to set the window on.</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>handle</code></em> :</span></p></td> |
| <td>a handle referencing the window.</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-overlay-prepare-window-handle"></a><h3>gst_video_overlay_prepare_window_handle ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> gst_video_overlay_prepare_window_handle |
| (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>);</pre> |
| <p> |
| This will post a "prepare-window-handle" element message on the bus |
| to give applications an opportunity to call |
| <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-set-window-handle" title="gst_video_overlay_set_window_handle ()"><code class="function">gst_video_overlay_set_window_handle()</code></a> before a plugin creates its own |
| window. |
| </p> |
| <p> |
| This function should only be used by video overlay plugin developers. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody><tr> |
| <td><p><span class="term"><em class="parameter"><code>overlay</code></em> :</span></p></td> |
| <td>a <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> which does not yet have an Window handle set</td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-overlay-expose"></a><h3>gst_video_overlay_expose ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> gst_video_overlay_expose (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>);</pre> |
| <p> |
| Tell an overlay that it has been exposed. This will redraw the current frame |
| in the drawable even if the pipeline is PAUSED. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody><tr> |
| <td><p><span class="term"><em class="parameter"><code>overlay</code></em> :</span></p></td> |
| <td>a <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> to expose.</td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-overlay-handle-events"></a><h3>gst_video_overlay_handle_events ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> gst_video_overlay_handle_events (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> handle_events</code></em>);</pre> |
| <p> |
| Tell an overlay that it should handle events from the window system. These |
| events are forwarded upstream as navigation events. In some window system, |
| events are not propagated in the window hierarchy if a client is listening |
| for them. This method allows you to disable events handling completely |
| from the <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</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>overlay</code></em> :</span></p></td> |
| <td>a <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> to expose.</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>handle_events</code></em> :</span></p></td> |
| <td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> indicating if events should be handled or not.</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-overlay-set-render-rectangle"></a><h3>gst_video_overlay_set_render_rectangle ()</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_overlay_set_render_rectangle |
| (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> *overlay</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> x</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> y</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>, |
| <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>);</pre> |
| <p> |
| Configure a subregion as a video target within the window set by |
| <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-set-window-handle" title="gst_video_overlay_set_window_handle ()"><code class="function">gst_video_overlay_set_window_handle()</code></a>. If this is not used or not supported |
| the video will fill the area of the window set as the overlay to 100%. |
| By specifying the rectangle, the video can be overlayed to a specific region |
| of that window only. After setting the new rectangle one should call |
| <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#gst-video-overlay-expose" title="gst_video_overlay_expose ()"><code class="function">gst_video_overlay_expose()</code></a> to force a redraw. To unset the region pass -1 for |
| the <em class="parameter"><code>width</code></em> and <em class="parameter"><code>height</code></em> parameters. |
| </p> |
| <p> |
| This method is needed for non fullscreen video overlay in UI toolkits that |
| do not support subwindows. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>overlay</code></em> :</span></p></td> |
| <td>a <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td> |
| <td>the horizontal offset of the render area inside the window</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td> |
| <td>the vertical offset of the render area inside the window</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td> |
| <td>the width of the render area inside the window</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td> |
| <td>the height of the render area inside the window</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> |
| <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not supported by the sink.</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-is-video-overlay-prepare-window-handle-message"></a><h3>gst_is_video_overlay_prepare_window_handle_message ()</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_is_video_overlay_prepare_window_handle_message |
| (<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> *msg</code></em>);</pre> |
| <p> |
| Convenience function to check if the given message is a |
| "prepare-window-handle" message from a <a class="link" href="gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay"><span class="type">GstVideoOverlay</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>msg</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"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td>whether <em class="parameter"><code>msg</code></em> is a "prepare-window-handle" message</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="footer"> |
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