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600 lines
20 KiB
C
600 lines
20 KiB
C
/* GStreamer Video Overlay interface
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* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* Copyright (C) 2011 Tim-Philipp Müller <tim@centricular.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstvideooverlay
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* @title: GstVideoOverlay
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* @short_description: 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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*
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* The #GstVideoOverlay interface is used for 2 main purposes :
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*
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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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*
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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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*
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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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* |[
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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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*
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* win = XCreateSimpleWindow (disp, root, 0, 0, 320, 240, 0, 0, 0);
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*
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* XSetWindowBackgroundPixmap (disp, win, None);
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*
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* XMapRaised (disp, win);
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*
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* XSync (disp, FALSE);
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*
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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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*
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* gst_message_unref (message);
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*
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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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* ]|
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*
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* ## Two basic usage scenarios
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*
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* There are two basic usage scenarios: in the simplest case, the application
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* uses #playbin or #playsink 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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*
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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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*
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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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*
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* ## GstVideoOverlay and Gtk+
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*
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* |[
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* #include <gst/video/videooverlay.h>
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* #include <gtk/gtk.h>
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* #ifdef GDK_WINDOWING_X11
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* #include <gdk/gdkx.h> // for GDK_WINDOW_XID
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* #endif
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* #ifdef GDK_WINDOWING_WIN32
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* #include <gdk/gdkwin32.h> // for GDK_WINDOW_HWND
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* #endif
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* ...
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* static guintptr video_window_handle = 0;
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* ...
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* static GstBusSyncReply
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* bus_sync_handler (GstBus * bus, GstMessage * message, gpointer user_data)
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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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*
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* if (video_window_handle != 0) {
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* GstVideoOverlay *overlay;
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*
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* // GST_MESSAGE_SRC (message) will be the video sink element
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* overlay = GST_VIDEO_OVERLAY (GST_MESSAGE_SRC (message));
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* gst_video_overlay_set_window_handle (overlay, video_window_handle);
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* } else {
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* g_warning ("Should have obtained video_window_handle by now!");
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* }
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*
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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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* static void
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* video_widget_realize_cb (GtkWidget * widget, gpointer data)
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* {
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* #if GTK_CHECK_VERSION(2,18,0)
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* // Tell Gtk+/Gdk to create a native window for this widget instead of
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* // drawing onto the parent widget.
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* // This is here just for pedagogical purposes, GDK_WINDOW_XID will call
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* // it as well in newer Gtk versions
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* if (!gdk_window_ensure_native (widget->window))
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* g_error ("Couldn't create native window needed for GstVideoOverlay!");
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* #endif
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*
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* #ifdef GDK_WINDOWING_X11
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* {
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* gulong xid = GDK_WINDOW_XID (gtk_widget_get_window (video_window));
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* video_window_handle = xid;
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* }
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* #endif
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* #ifdef GDK_WINDOWING_WIN32
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* {
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* HWND wnd = GDK_WINDOW_HWND (gtk_widget_get_window (video_window));
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* video_window_handle = (guintptr) wnd;
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* }
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* #endif
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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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* GtkWidget *video_window;
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* GtkWidget *app_window;
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* ...
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* app_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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* ...
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* video_window = gtk_drawing_area_new ();
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* g_signal_connect (video_window, "realize",
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* G_CALLBACK (video_widget_realize_cb), NULL);
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* gtk_widget_set_double_buffered (video_window, FALSE);
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* ...
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* // usually the video_window will not be directly embedded into the
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* // application window like this, but there will be many other widgets
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* // and the video window will be embedded in one of them instead
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* gtk_container_add (GTK_CONTAINER (ap_window), video_window);
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* ...
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* // show the GUI
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* gtk_widget_show_all (app_window);
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*
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* // realize window now so that the video window gets created and we can
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* // obtain its XID/HWND before the pipeline is started up and the videosink
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* // asks for the XID/HWND of the window to render onto
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* gtk_widget_realize (video_window);
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*
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* // we should have the XID/HWND now
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* g_assert (video_window_handle != 0);
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* ...
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* // set up sync handler for setting the xid once the pipeline is started
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* bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
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* gst_bus_set_sync_handler (bus, (GstBusSyncHandler) bus_sync_handler, NULL,
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* NULL);
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* gst_object_unref (bus);
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* ...
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* gst_element_set_state (pipeline, GST_STATE_PLAYING);
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* ...
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* }
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* ]|
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*
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* ## GstVideoOverlay and Qt
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*
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* |[
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* #include <glib.h>;
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* #include <gst/gst.h>;
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* #include <gst/video/videooverlay.h>;
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*
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* #include <QApplication>;
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* #include <QTimer>;
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* #include <QWidget>;
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*
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* int main(int argc, char *argv[])
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* {
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* if (!g_thread_supported ())
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* g_thread_init (NULL);
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*
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* gst_init (&argc, &argv);
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* QApplication app(argc, argv);
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* app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));
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*
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* // prepare the pipeline
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*
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* GstElement *pipeline = gst_pipeline_new ("xvoverlay");
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* GstElement *src = gst_element_factory_make ("videotestsrc", NULL);
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* GstElement *sink = gst_element_factory_make ("xvimagesink", NULL);
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* gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
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* gst_element_link (src, sink);
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*
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* // prepare the ui
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*
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* QWidget window;
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* window.resize(320, 240);
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* window.show();
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*
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* WId xwinid = window.winId();
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* gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (sink), xwinid);
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*
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* // run the pipeline
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*
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* GstStateChangeReturn sret = gst_element_set_state (pipeline,
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* GST_STATE_PLAYING);
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* if (sret == GST_STATE_CHANGE_FAILURE) {
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* gst_element_set_state (pipeline, GST_STATE_NULL);
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* gst_object_unref (pipeline);
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* // Exit application
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* QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
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* }
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*
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* int ret = app.exec();
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*
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* window.hide();
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* gst_element_set_state (pipeline, GST_STATE_NULL);
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* gst_object_unref (pipeline);
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*
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* return ret;
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* }
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* ]|
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "videooverlay.h"
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enum
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{
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PROP_RENDER_RECTANGLE,
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};
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GST_DEBUG_CATEGORY_STATIC (gst_video_overlay_debug);
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#define GST_CAT_DEFAULT gst_video_overlay_debug
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GType
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gst_video_overlay_get_type (void)
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{
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static GType gst_video_overlay_type = 0;
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if (!gst_video_overlay_type) {
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static const GTypeInfo gst_video_overlay_info = {
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sizeof (GstVideoOverlayInterface),
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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0,
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0,
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NULL,
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};
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gst_video_overlay_type = g_type_register_static (G_TYPE_INTERFACE,
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"GstVideoOverlay", &gst_video_overlay_info, 0);
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GST_DEBUG_CATEGORY_INIT (gst_video_overlay_debug, "videooverlay", 0,
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"videooverlay interface");
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}
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return gst_video_overlay_type;
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}
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/**
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* gst_video_overlay_set_window_handle:
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* @overlay: a #GstVideoOverlay to set the window on.
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* @handle: a handle referencing the window.
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*
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* This will call the video overlay's set_window_handle method. You
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* should use this method to tell to an overlay to display video output to a
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* specific window (e.g. an XWindow on X11). Passing 0 as the @handle will
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* tell the overlay to stop using that window and create an internal one.
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*/
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void
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gst_video_overlay_set_window_handle (GstVideoOverlay * overlay, guintptr handle)
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{
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GstVideoOverlayInterface *iface;
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g_return_if_fail (overlay != NULL);
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g_return_if_fail (GST_IS_VIDEO_OVERLAY (overlay));
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iface = GST_VIDEO_OVERLAY_GET_INTERFACE (overlay);
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if (iface->set_window_handle) {
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iface->set_window_handle (overlay, handle);
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}
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}
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/**
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* gst_video_overlay_got_window_handle:
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* @overlay: a #GstVideoOverlay which got a window
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* @handle: a platform-specific handle referencing the window
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*
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* This will post a "have-window-handle" element message on the bus.
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*
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* This function should only be used by video overlay plugin developers.
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*/
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void
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gst_video_overlay_got_window_handle (GstVideoOverlay * overlay, guintptr handle)
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{
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GstStructure *s;
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GstMessage *msg;
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g_return_if_fail (overlay != NULL);
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g_return_if_fail (GST_IS_VIDEO_OVERLAY (overlay));
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GST_LOG_OBJECT (GST_OBJECT (overlay), "window_handle = %p", (gpointer)
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handle);
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s = gst_structure_new ("have-window-handle",
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"window-handle", G_TYPE_UINT64, (guint64) handle, NULL);
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msg = gst_message_new_element (GST_OBJECT (overlay), s);
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gst_element_post_message (GST_ELEMENT (overlay), msg);
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}
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/**
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* gst_video_overlay_prepare_window_handle:
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* @overlay: a #GstVideoOverlay which does not yet have an Window handle set
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*
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* This will post a "prepare-window-handle" element message on the bus
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* to give applications an opportunity to call
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* gst_video_overlay_set_window_handle() before a plugin creates its own
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* window.
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*
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* This function should only be used by video overlay plugin developers.
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*/
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void
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gst_video_overlay_prepare_window_handle (GstVideoOverlay * overlay)
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{
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GstStructure *s;
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GstMessage *msg;
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g_return_if_fail (overlay != NULL);
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g_return_if_fail (GST_IS_VIDEO_OVERLAY (overlay));
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GST_LOG_OBJECT (GST_OBJECT (overlay), "prepare window handle");
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s = gst_structure_new_empty ("prepare-window-handle");
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msg = gst_message_new_element (GST_OBJECT (overlay), s);
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gst_element_post_message (GST_ELEMENT (overlay), msg);
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}
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/**
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* gst_video_overlay_expose:
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* @overlay: a #GstVideoOverlay to expose.
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*
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* Tell an overlay that it has been exposed. This will redraw the current frame
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* in the drawable even if the pipeline is PAUSED.
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*/
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void
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gst_video_overlay_expose (GstVideoOverlay * overlay)
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{
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GstVideoOverlayInterface *iface;
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g_return_if_fail (overlay != NULL);
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g_return_if_fail (GST_IS_VIDEO_OVERLAY (overlay));
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iface = GST_VIDEO_OVERLAY_GET_INTERFACE (overlay);
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if (iface->expose) {
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iface->expose (overlay);
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}
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}
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/**
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* gst_video_overlay_handle_events:
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* @overlay: a #GstVideoOverlay to expose.
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* @handle_events: a #gboolean indicating if events should be handled or not.
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*
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* Tell an overlay that it should handle events from the window system. These
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* events are forwarded upstream as navigation events. In some window system,
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* events are not propagated in the window hierarchy if a client is listening
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* for them. This method allows you to disable events handling completely
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* from the #GstVideoOverlay.
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*/
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void
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gst_video_overlay_handle_events (GstVideoOverlay * overlay,
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gboolean handle_events)
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{
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GstVideoOverlayInterface *iface;
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g_return_if_fail (overlay != NULL);
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g_return_if_fail (GST_IS_VIDEO_OVERLAY (overlay));
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iface = GST_VIDEO_OVERLAY_GET_INTERFACE (overlay);
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if (iface->handle_events) {
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iface->handle_events (overlay, handle_events);
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}
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}
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/**
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* gst_video_overlay_set_render_rectangle:
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* @overlay: a #GstVideoOverlay
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* @x: the horizontal offset of the render area inside the window
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* @y: the vertical offset of the render area inside the window
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* @width: the width of the render area inside the window
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* @height: the height of the render area inside the window
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*
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* Configure a subregion as a video target within the window set by
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* gst_video_overlay_set_window_handle(). If this is not used or not supported
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* the video will fill the area of the window set as the overlay to 100%.
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* 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
|
|
* gst_video_overlay_expose() to force a redraw. To unset the region pass -1 for
|
|
* the @width and @height parameters.
|
|
*
|
|
* This method is needed for non fullscreen video overlay in UI toolkits that
|
|
* do not support subwindows.
|
|
*
|
|
* Returns: %FALSE if not supported by the sink.
|
|
*/
|
|
gboolean
|
|
gst_video_overlay_set_render_rectangle (GstVideoOverlay * overlay,
|
|
gint x, gint y, gint width, gint height)
|
|
{
|
|
GstVideoOverlayInterface *iface;
|
|
|
|
g_return_val_if_fail (overlay != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_VIDEO_OVERLAY (overlay), FALSE);
|
|
g_return_val_if_fail ((width == -1 && height == -1) ||
|
|
(width > 0 && height > 0), FALSE);
|
|
|
|
iface = GST_VIDEO_OVERLAY_GET_INTERFACE (overlay);
|
|
|
|
if (iface->set_render_rectangle) {
|
|
iface->set_render_rectangle (overlay, x, y, width, height);
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_is_video_overlay_prepare_window_handle_message:
|
|
* @msg: a #GstMessage
|
|
*
|
|
* Convenience function to check if the given message is a
|
|
* "prepare-window-handle" message from a #GstVideoOverlay.
|
|
*
|
|
* Returns: whether @msg is a "prepare-window-handle" message
|
|
*/
|
|
gboolean
|
|
gst_is_video_overlay_prepare_window_handle_message (GstMessage * msg)
|
|
{
|
|
g_return_val_if_fail (msg != NULL, FALSE);
|
|
|
|
if (GST_MESSAGE_TYPE (msg) != GST_MESSAGE_ELEMENT)
|
|
return FALSE;
|
|
|
|
return gst_message_has_name (msg, "prepare-window-handle");
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_video_overlay_install_properties:
|
|
* @oclass: The class on which the properties will be installed
|
|
* @last_prop_id: The first free property ID to use
|
|
*
|
|
* This helper shall be used by classes implementing the #GstVideoOverlay
|
|
* interface that want the render rectangle to be controllable using
|
|
* properties. This helper will install "render-rectangle" property into the
|
|
* class.
|
|
*
|
|
* Since: 1.14
|
|
*/
|
|
void
|
|
gst_video_overlay_install_properties (GObjectClass * oclass, gint last_prop_id)
|
|
{
|
|
g_object_class_install_property (oclass, last_prop_id + PROP_RENDER_RECTANGLE,
|
|
gst_param_spec_array ("render-rectangle", "Render Rectangle",
|
|
"The render rectangle ('<x, y, width, height>')",
|
|
g_param_spec_int ("rect-value", "Rectangle Value",
|
|
"One of x, y, width or height value.", G_MININT, G_MAXINT, -1,
|
|
G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS),
|
|
G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
|
|
}
|
|
|
|
/**
|
|
* gst_video_overlay_set_property:
|
|
* @object: The instance on which the property is set
|
|
* @last_prop_id: The highest property ID.
|
|
* @property_id: The property ID
|
|
* @value: The #GValue to be set
|
|
*
|
|
* This helper shall be used by classes implementing the #GstVideoOverlay
|
|
* interface that want the render rectangle to be controllable using
|
|
* properties. This helper will parse and set the render rectangle calling
|
|
* gst_video_overlay_set_render_rectangle().
|
|
*
|
|
* Returns: %TRUE if the @property_id matches the GstVideoOverlay property
|
|
*
|
|
* Since: 1.14
|
|
*/
|
|
gboolean
|
|
gst_video_overlay_set_property (GObject * object, gint last_prop_id,
|
|
guint property_id, const GValue * value)
|
|
{
|
|
gboolean ret = FALSE;
|
|
|
|
if (property_id == last_prop_id) {
|
|
const GValue *v;
|
|
gint rect[4], i;
|
|
|
|
ret = TRUE;
|
|
|
|
if (gst_value_array_get_size (value) != 4)
|
|
goto wrong_format;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
v = gst_value_array_get_value (value, i);
|
|
if (!G_VALUE_HOLDS_INT (v))
|
|
goto wrong_format;
|
|
|
|
rect[i] = g_value_get_int (v);
|
|
}
|
|
|
|
gst_video_overlay_set_render_rectangle (GST_VIDEO_OVERLAY (object),
|
|
rect[0], rect[1], rect[2], rect[3]);
|
|
}
|
|
|
|
return ret;
|
|
|
|
wrong_format:
|
|
{
|
|
GValue string = G_VALUE_INIT;
|
|
|
|
g_value_init (&string, G_TYPE_STRING);
|
|
g_value_transform (value, &string);
|
|
|
|
g_critical ("Badly formatted rectangle, must contains four gint (got '%s')",
|
|
g_value_get_string (&string));
|
|
|
|
g_value_unset (&string);
|
|
return TRUE;
|
|
}
|
|
}
|