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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstVideoOverlay: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Library Reference Manual">
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<link rel="up" href="gstreamer-video.html" title="Video Library">
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<link rel="prev" href="GstVideoOrientation.html" title="GstVideoOrientation">
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<link rel="next" href="GstVideoDecoder.html" title="GstVideoDecoder">
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<meta name="generator" content="GTK-Doc V1.28 (XML mode)">
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<link rel="stylesheet" href="style.css" type="text/css">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description |
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Object Hierarchy
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GstVideoOverlay
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GstVideoOverlay — Interface for setting/getting a window system resource
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on elements supporting it to configure a window into which to render a
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video.
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Functions
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void
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gst_video_overlay_got_window_handle ()
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void
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gst_video_overlay_set_window_handle ()
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void
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gst_video_overlay_prepare_window_handle ()
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void
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gst_video_overlay_expose ()
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void
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gst_video_overlay_handle_events ()
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gboolean
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gst_video_overlay_set_render_rectangle ()
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gboolean
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gst_is_video_overlay_prepare_window_handle_message ()
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void
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gst_video_overlay_install_properties ()
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gboolean
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gst_video_overlay_set_property ()
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Types and Values
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GstVideoOverlay
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struct
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GstVideoOverlayInterface
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Object Hierarchy
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GInterface
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╰── GstVideoOverlay
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Includes
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#include <gst/video/video.h>
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Description
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The GstVideoOverlay interface is used for 2 main purposes :
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To get a grab on the Window where the video sink element is going to render.
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This is achieved by either being informed about the Window identifier that
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the video sink element generated, or by forcing the video sink element to use
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a specific Window identifier for rendering.
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To force a redrawing of the latest video frame the video sink element
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displayed on the Window. Indeed if the GstPipeline is in GST_STATE_PAUSED
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state, moving the Window around will damage its content. Application
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developers will want to handle the Expose events themselves and force the
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video sink element to refresh the Window's content.
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Using the Window created by the video sink is probably the simplest scenario,
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in some cases, though, it might not be flexible enough for application
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developers if they need to catch events such as mouse moves and button
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clicks.
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Setting a specific Window identifier on the video sink element is the most
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flexible solution but it has some issues. Indeed the application needs to set
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its Window identifier at the right time to avoid internal Window creation
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from the video sink element. To solve this issue a GstMessage is posted on
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the bus to inform the application that it should set the Window identifier
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immediately. Here is an example on how to do that correctly:
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static GstBusSyncReply
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create_window (GstBus * bus, GstMessage * message, GstPipeline * pipeline)
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{
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// ignore anything but 'prepare-window-handle' element messages
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if (!gst_is_video_overlay_prepare_window_handle_message (message))
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return GST_BUS_PASS;
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win = XCreateSimpleWindow (disp, root, 0, 0, 320, 240, 0, 0, 0);
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XSetWindowBackgroundPixmap (disp, win, None);
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XMapRaised (disp, win);
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XSync (disp, FALSE);
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gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (GST_MESSAGE_SRC (message)),
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win);
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gst_message_unref (message);
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return GST_BUS_DROP;
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}
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...
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int
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main (int argc, char **argv)
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{
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...
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bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
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gst_bus_set_sync_handler (bus, (GstBusSyncHandler) create_window, pipeline,
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NULL);
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...
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}
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Two basic usage scenarios
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There are two basic usage scenarios: in the simplest case, the application
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uses playbin or plasink or knows exactly what particular element is used
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for video output, which is usually the case when the application creates
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the videosink to use (e.g. xvimagesink, ximagesink, etc.) itself; in this
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case, the application can just create the videosink element, create and
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realize the window to render the video on and then
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call gst_video_overlay_set_window_handle() directly with the XID or native
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window handle, before starting up the pipeline.
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As playbin and playsink implement the video overlay interface and proxy
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it transparently to the actual video sink even if it is created later, this
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case also applies when using these elements.
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In the other and more common case, the application does not know in advance
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what GStreamer video sink element will be used for video output. This is
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usually the case when an element such as autovideosink is used.
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In this case, the video sink element itself is created
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asynchronously from a GStreamer streaming thread some time after the
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pipeline has been started up. When that happens, however, the video sink
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will need to know right then whether to render onto an already existing
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application window or whether to create its own window. This is when it
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posts a prepare-window-handle message, and that is also why this message needs
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to be handled in a sync bus handler which will be called from the streaming
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thread directly (because the video sink will need an answer right then).
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As response to the prepare-window-handle element message in the bus sync
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handler, the application may use gst_video_overlay_set_window_handle() to tell
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the video sink to render onto an existing window surface. At this point the
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application should already have obtained the window handle / XID, so it
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just needs to set it. It is generally not advisable to call any GUI toolkit
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functions or window system functions from the streaming thread in which the
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prepare-window-handle message is handled, because most GUI toolkits and
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windowing systems are not thread-safe at all and a lot of care would be
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required to co-ordinate the toolkit and window system calls of the
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different threads (Gtk+ users please note: prior to Gtk+ 2.18
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GDK_WINDOW_XID() was just a simple structure access, so generally fine to do
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within the bus sync handler; this macro was changed to a function call in
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Gtk+ 2.18 and later, which is likely to cause problems when called from a
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sync handler; see below for a better approach without GDK_WINDOW_XID()
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used in the callback).
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GstVideoOverlay and Gtk+
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96
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#include <gst/video/videooverlay.h>
|
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0652a1 |
#include <gtk/gtk.h>
|
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0652a1 |
#ifdef GDK_WINDOWING_X11
|
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0652a1 |
#include <gdk/gdkx.h> // for GDK_WINDOW_XID
|
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0652a1 |
#endif
|
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0652a1 |
#ifdef GDK_WINDOWING_WIN32
|
|
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0652a1 |
#include <gdk/gdkwin32.h> // for GDK_WINDOW_HWND
|
|
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0652a1 |
#endif
|
|
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0652a1 |
...
|
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0652a1 |
static guintptr video_window_handle = 0;
|
|
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0652a1 |
...
|
|
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0652a1 |
static GstBusSyncReply
|
|
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0652a1 |
bus_sync_handler (GstBus * bus, GstMessage * message, gpointer user_data)
|
|
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0652a1 |
{
|
|
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0652a1 |
// ignore anything but 'prepare-window-handle' element messages
|
|
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0652a1 |
if (!gst_is_video_overlay_prepare_window_handle_message (message))
|
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0652a1 |
return GST_BUS_PASS;
|
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0652a1 |
|
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0652a1 |
if (video_window_handle != 0) {
|
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0652a1 |
GstVideoOverlay *overlay;
|
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0652a1 |
|
|
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0652a1 |
// GST_MESSAGE_SRC (message) will be the video sink element
|
|
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0652a1 |
overlay = GST_VIDEO_OVERLAY (GST_MESSAGE_SRC (message));
|
|
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0652a1 |
gst_video_overlay_set_window_handle (overlay, video_window_handle);
|
|
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0652a1 |
} else {
|
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0652a1 |
g_warning ("Should have obtained video_window_handle by now!");
|
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0652a1 |
}
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|
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gst_message_unref (message);
|
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0652a1 |
return GST_BUS_DROP;
|
|
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0652a1 |
}
|
|
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0652a1 |
...
|
|
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0652a1 |
static void
|
|
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0652a1 |
video_widget_realize_cb (GtkWidget * widget, gpointer data)
|
|
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0652a1 |
{
|
|
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0652a1 |
#if GTK_CHECK_VERSION(2,18,0)
|
|
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0652a1 |
// Tell Gtk+/Gdk to create a native window for this widget instead of
|
|
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0652a1 |
// drawing onto the parent widget.
|
|
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0652a1 |
// This is here just for pedagogical purposes, GDK_WINDOW_XID will call
|
|
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0652a1 |
// it as well in newer Gtk versions
|
|
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0652a1 |
if (!gdk_window_ensure_native (widget->window))
|
|
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0652a1 |
g_error ("Couldn't create native window needed for GstVideoOverlay!");
|
|
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0652a1 |
#endif
|
|
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0652a1 |
|
|
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0652a1 |
#ifdef GDK_WINDOWING_X11
|
|
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0652a1 |
{
|
|
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0652a1 |
gulong xid = GDK_WINDOW_XID (gtk_widget_get_window (video_window));
|
|
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0652a1 |
video_window_handle = xid;
|
|
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0652a1 |
}
|
|
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0652a1 |
#endif
|
|
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0652a1 |
#ifdef GDK_WINDOWING_WIN32
|
|
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0652a1 |
{
|
|
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0652a1 |
HWND wnd = GDK_WINDOW_HWND (gtk_widget_get_window (video_window));
|
|
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0652a1 |
video_window_handle = (guintptr) wnd;
|
|
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0652a1 |
}
|
|
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0652a1 |
#endif
|
|
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0652a1 |
}
|
|
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0652a1 |
...
|
|
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0652a1 |
int
|
|
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0652a1 |
main (int argc, char **argv)
|
|
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0652a1 |
{
|
|
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0652a1 |
GtkWidget *video_window;
|
|
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0652a1 |
GtkWidget *app_window;
|
|
Packit |
0652a1 |
...
|
|
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0652a1 |
app_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
|
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0652a1 |
...
|
|
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0652a1 |
video_window = gtk_drawing_area_new ();
|
|
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0652a1 |
g_signal_connect (video_window, "realize",
|
|
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0652a1 |
G_CALLBACK (video_widget_realize_cb), NULL);
|
|
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0652a1 |
gtk_widget_set_double_buffered (video_window, FALSE);
|
|
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0652a1 |
...
|
|
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0652a1 |
// usually the video_window will not be directly embedded into the
|
|
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0652a1 |
// application window like this, but there will be many other widgets
|
|
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0652a1 |
// and the video window will be embedded in one of them instead
|
|
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0652a1 |
gtk_container_add (GTK_CONTAINER (ap_window), video_window);
|
|
Packit |
0652a1 |
...
|
|
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0652a1 |
// show the GUI
|
|
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0652a1 |
gtk_widget_show_all (app_window);
|
|
Packit |
0652a1 |
|
|
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0652a1 |
// realize window now so that the video window gets created and we can
|
|
Packit |
0652a1 |
// obtain its XID/HWND before the pipeline is started up and the videosink
|
|
Packit |
0652a1 |
// asks for the XID/HWND of the window to render onto
|
|
Packit |
0652a1 |
gtk_widget_realize (video_window);
|
|
Packit |
0652a1 |
|
|
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0652a1 |
// we should have the XID/HWND now
|
|
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0652a1 |
g_assert (video_window_handle != 0);
|
|
Packit |
0652a1 |
...
|
|
Packit |
0652a1 |
// set up sync handler for setting the xid once the pipeline is started
|
|
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0652a1 |
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
|
|
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0652a1 |
gst_bus_set_sync_handler (bus, (GstBusSyncHandler) bus_sync_handler, NULL,
|
|
Packit |
0652a1 |
NULL);
|
|
Packit |
0652a1 |
gst_object_unref (bus);
|
|
Packit |
0652a1 |
...
|
|
Packit |
0652a1 |
gst_element_set_state (pipeline, GST_STATE_PLAYING);
|
|
Packit |
0652a1 |
...
|
|
Packit |
0652a1 |
}
|
|
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|
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|
|
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0652a1 |
GstVideoOverlay and Qt
|
|
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51
|
|
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52
|
|
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0652a1 |
53
|
|
Packit |
0652a1 |
#include <glib.h>
|
|
Packit |
0652a1 |
#include <gst/gst.h>
|
|
Packit |
0652a1 |
#include <gst/video/videooverlay.h>
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
#include <QApplication>
|
|
Packit |
0652a1 |
#include <QTimer>
|
|
Packit |
0652a1 |
#include <QWidget>
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
int main(int argc, char *argv[])
|
|
Packit |
0652a1 |
{
|
|
Packit |
0652a1 |
if (!g_thread_supported ())
|
|
Packit |
0652a1 |
g_thread_init (NULL);
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
gst_init (&argc, &argv);
|
|
Packit |
0652a1 |
QApplication app(argc, argv);
|
|
Packit |
0652a1 |
app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
// prepare the pipeline
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
GstElement *pipeline = gst_pipeline_new ("xvoverlay");
|
|
Packit |
0652a1 |
GstElement *src = gst_element_factory_make ("videotestsrc", NULL);
|
|
Packit |
0652a1 |
GstElement *sink = gst_element_factory_make ("xvimagesink", NULL);
|
|
Packit |
0652a1 |
gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
|
|
Packit |
0652a1 |
gst_element_link (src, sink);
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
// prepare the ui
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
QWidget window;
|
|
Packit |
0652a1 |
window.resize(320, 240);
|
|
Packit |
0652a1 |
window.show();
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
WId xwinid = window.winId();
|
|
Packit |
0652a1 |
gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (sink), xwinid);
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
// run the pipeline
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
GstStateChangeReturn sret = gst_element_set_state (pipeline,
|
|
Packit |
0652a1 |
GST_STATE_PLAYING);
|
|
Packit |
0652a1 |
if (sret == GST_STATE_CHANGE_FAILURE) {
|
|
Packit |
0652a1 |
gst_element_set_state (pipeline, GST_STATE_NULL);
|
|
Packit |
0652a1 |
gst_object_unref (pipeline);
|
|
Packit |
0652a1 |
// Exit application
|
|
Packit |
0652a1 |
QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
|
|
Packit |
0652a1 |
}
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
int ret = app.exec();
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
window.hide();
|
|
Packit |
0652a1 |
gst_element_set_state (pipeline, GST_STATE_NULL);
|
|
Packit |
0652a1 |
gst_object_unref (pipeline);
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
return ret;
|
|
Packit |
0652a1 |
}
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Functions
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
gst_video_overlay_got_window_handle ()
|
|
Packit |
0652a1 |
void
|
|
Packit |
0652a1 |
gst_video_overlay_got_window_handle (GstVideoOverlay *overlay,
|
|
Packit |
0652a1 |
guintptr handle);
|
|
Packit |
0652a1 |
This will post a "have-window-handle" element message on the bus.
|
|
Packit |
0652a1 |
This function should only be used by video overlay plugin developers.
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Parameters
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
overlay
|
|
Packit |
0652a1 |
a GstVideoOverlay which got a window
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
handle
|
|
Packit |
0652a1 |
a platform-specific handle referencing the window
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
gst_video_overlay_set_window_handle ()
|
|
Packit |
0652a1 |
void
|
|
Packit |
0652a1 |
gst_video_overlay_set_window_handle (GstVideoOverlay *overlay,
|
|
Packit |
0652a1 |
guintptr handle);
|
|
Packit |
0652a1 |
This will call the video overlay's set_window_handle method. You
|
|
Packit |
0652a1 |
should use this method to tell to an overlay to display video output to a
|
|
Packit |
0652a1 |
specific window (e.g. an XWindow on X11). Passing 0 as the handle
|
|
Packit |
0652a1 |
will
|
|
Packit |
0652a1 |
tell the overlay to stop using that window and create an internal one.
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Parameters
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
overlay
|
|
Packit |
0652a1 |
a GstVideoOverlay to set the window on.
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
handle
|
|
Packit |
0652a1 |
a handle referencing the window.
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
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0652a1 |
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0652a1 |
gst_video_overlay_prepare_window_handle ()
|
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0652a1 |
void
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0652a1 |
gst_video_overlay_prepare_window_handle
|
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0652a1 |
(GstVideoOverlay *overlay);
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0652a1 |
This will post a "prepare-window-handle" element message on the bus
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0652a1 |
to give applications an opportunity to call
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0652a1 |
gst_video_overlay_set_window_handle() before a plugin creates its own
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0652a1 |
window.
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0652a1 |
This function should only be used by video overlay plugin developers.
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0652a1 |
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0652a1 |
Parameters
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0652a1 |
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0652a1 |
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0652a1 |
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overlay
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0652a1 |
a GstVideoOverlay which does not yet have an Window handle set
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
gst_video_overlay_expose ()
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0652a1 |
void
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0652a1 |
gst_video_overlay_expose (GstVideoOverlay *overlay);
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0652a1 |
Tell an overlay that it has been exposed. This will redraw the current frame
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0652a1 |
in the drawable even if the pipeline is PAUSED.
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0652a1 |
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0652a1 |
Parameters
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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overlay
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0652a1 |
a GstVideoOverlay to expose.
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0652a1 |
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0652a1 |
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0652a1 |
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gst_video_overlay_handle_events ()
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0652a1 |
void
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0652a1 |
gst_video_overlay_handle_events (GstVideoOverlay *overlay,
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0652a1 |
gboolean handle_events);
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0652a1 |
Tell an overlay that it should handle events from the window system. These
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0652a1 |
events are forwarded upstream as navigation events. In some window system,
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0652a1 |
events are not propagated in the window hierarchy if a client is listening
|
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0652a1 |
for them. This method allows you to disable events handling completely
|
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0652a1 |
from the GstVideoOverlay.
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0652a1 |
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0652a1 |
Parameters
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Packit |
0652a1 |
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Packit |
0652a1 |
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Packit |
0652a1 |
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Packit |
0652a1 |
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Packit |
0652a1 |
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Packit |
0652a1 |
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0652a1 |
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Packit |
0652a1 |
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0652a1 |
overlay
|
|
Packit |
0652a1 |
a GstVideoOverlay to expose.
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Packit |
0652a1 |
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Packit |
0652a1 |
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Packit |
0652a1 |
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0652a1 |
handle_events
|
|
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0652a1 |
a gboolean indicating if events should be handled or not.
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
gst_video_overlay_set_render_rectangle ()
|
|
Packit |
0652a1 |
gboolean
|
|
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0652a1 |
gst_video_overlay_set_render_rectangle
|
|
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0652a1 |
(GstVideoOverlay *overlay,
|
|
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0652a1 |
gint x,
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|
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0652a1 |
gint y,
|
|
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0652a1 |
gint width,
|
|
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0652a1 |
gint height);
|
|
Packit |
0652a1 |
Configure a subregion as a video target within the window set by
|
|
Packit |
0652a1 |
gst_video_overlay_set_window_handle(). If this is not used or not supported
|
|
Packit |
0652a1 |
the video will fill the area of the window set as the overlay to 100%.
|
|
Packit |
0652a1 |
By specifying the rectangle, the video can be overlayed to a specific region
|
|
Packit |
0652a1 |
of that window only. After setting the new rectangle one should call
|
|
Packit |
0652a1 |
gst_video_overlay_expose() to force a redraw. To unset the region pass -1 for
|
|
Packit |
0652a1 |
the width
|
|
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0652a1 |
and height
|
|
Packit |
0652a1 |
parameters.
|
|
Packit |
0652a1 |
This method is needed for non fullscreen video overlay in UI toolkits that
|
|
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0652a1 |
do not support subwindows.
|
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0652a1 |
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0652a1 |
Parameters
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Packit |
0652a1 |
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Packit |
0652a1 |
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Packit |
0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
|
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Packit |
0652a1 |
|
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0652a1 |
overlay
|
|
Packit |
0652a1 |
a GstVideoOverlay
|
|
Packit |
0652a1 |
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Packit |
0652a1 |
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|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
x
|
|
Packit |
0652a1 |
the horizontal offset of the render area inside the window
|
|
Packit |
0652a1 |
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Packit |
0652a1 |
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0652a1 |
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0652a1 |
y
|
|
Packit |
0652a1 |
the vertical offset of the render area inside the window
|
|
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0652a1 |
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0652a1 |
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|
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0652a1 |
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|
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0652a1 |
width
|
|
Packit |
0652a1 |
the width of the render area inside the window
|
|
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0652a1 |
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0652a1 |
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0652a1 |
|
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0652a1 |
height
|
|
Packit |
0652a1 |
the height of the render area inside the window
|
|
Packit |
0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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|
Packit |
0652a1 |
Returns
|
|
Packit |
0652a1 |
FALSE if not supported by the sink.
|
|
Packit |
0652a1 |
|
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Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
gst_is_video_overlay_prepare_window_handle_message ()
|
|
Packit |
0652a1 |
gboolean
|
|
Packit |
0652a1 |
gst_is_video_overlay_prepare_window_handle_message
|
|
Packit |
0652a1 |
(GstMessage *msg);
|
|
Packit |
0652a1 |
Convenience function to check if the given message is a
|
|
Packit |
0652a1 |
"prepare-window-handle" message from a GstVideoOverlay.
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Parameters
|
|
Packit |
0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
|
|
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0652a1 |
msg
|
|
Packit |
0652a1 |
a GstMessage
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
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Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Returns
|
|
Packit |
0652a1 |
whether msg
|
|
Packit |
0652a1 |
is a "prepare-window-handle" message
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
gst_video_overlay_install_properties ()
|
|
Packit |
0652a1 |
void
|
|
Packit |
0652a1 |
gst_video_overlay_install_properties (GObjectClass *oclass,
|
|
Packit |
0652a1 |
gint last_prop_id);
|
|
Packit |
0652a1 |
This helper shall be used by classes implementing the GstVideoOverlay
|
|
Packit |
0652a1 |
interface that want the render rectangle to be controllable using
|
|
Packit |
0652a1 |
properties. This helper will install "render-rectangle" property into the
|
|
Packit |
0652a1 |
class.
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Parameters
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
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Packit |
0652a1 |
|
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Packit |
0652a1 |
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Packit |
0652a1 |
|
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0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
oclass
|
|
Packit |
0652a1 |
The class on which the properties will be installed
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
last_prop_id
|
|
Packit |
0652a1 |
The first free property ID to use
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
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0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Since: 1.14
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
gst_video_overlay_set_property ()
|
|
Packit |
0652a1 |
gboolean
|
|
Packit |
0652a1 |
gst_video_overlay_set_property (GObject *object,
|
|
Packit |
0652a1 |
gint last_prop_id,
|
|
Packit |
0652a1 |
guint property_id,
|
|
Packit |
0652a1 |
const GValue *value);
|
|
Packit |
0652a1 |
This helper shall be used by classes implementing the GstVideoOverlay
|
|
Packit |
0652a1 |
interface that want the render rectangle to be controllable using
|
|
Packit |
0652a1 |
properties. This helper will parse and set the render rectangle calling
|
|
Packit |
0652a1 |
gst_video_overlay_set_render_rectangle().
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Parameters
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
|
|
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0652a1 |
|
|
Packit |
0652a1 |
object
|
|
Packit |
0652a1 |
The instance on which the property is set
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
last_prop_id
|
|
Packit |
0652a1 |
The highest property ID.
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
property_id
|
|
Packit |
0652a1 |
The property ID
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
value
|
|
Packit |
0652a1 |
The GValue to be set
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
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0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Returns
|
|
Packit |
0652a1 |
TRUE if the property_id
|
|
Packit |
0652a1 |
matches the GstVideoOverlay property
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Since: 1.14
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Types and Values
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
GstVideoOverlay
|
|
Packit |
0652a1 |
typedef struct _GstVideoOverlay GstVideoOverlay;
|
|
Packit |
0652a1 |
Opaque GstVideoOverlay interface structure
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
struct GstVideoOverlayInterface
|
|
Packit |
0652a1 |
struct GstVideoOverlayInterface {
|
|
Packit |
0652a1 |
GTypeInterface iface;
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
/* virtual functions */
|
|
Packit |
0652a1 |
void (*expose) (GstVideoOverlay *overlay);
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
void (*handle_events) (GstVideoOverlay *overlay, gboolean handle_events);
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
void (*set_render_rectangle) (GstVideoOverlay *overlay,
|
|
Packit |
0652a1 |
gint x, gint y,
|
|
Packit |
0652a1 |
gint width, gint height);
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
void (*set_window_handle) (GstVideoOverlay *overlay, guintptr handle);
|
|
Packit |
0652a1 |
};
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
GstVideoOverlay interface
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
Members
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
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0652a1 |
|
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0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
GTypeInterface iface;
|
|
Packit |
0652a1 |
parent interface type.
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
expose ()
|
|
Packit |
0652a1 |
virtual method to handle expose events
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
handle_events ()
|
|
Packit |
0652a1 |
virtual method to handle events
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
set_render_rectangle ()
|
|
Packit |
0652a1 |
virtual method to set the render rectangle
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
set_window_handle ()
|
|
Packit |
0652a1 |
virtual method to configure the window handle
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
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0652a1 |
|
|
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0652a1 |
|
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0652a1 |
|
|
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0652a1 |
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0652a1 |
|
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0652a1 |
|
|
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0652a1 |
Generated by GTK-Doc V1.28
|
|
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0652a1 |
</body>
|
|
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0652a1 |
</html>
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