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85e2c17f32
This is useful for cropped zooming of the overlay.
567 lines
18 KiB
C
567 lines
18 KiB
C
/* GStreamer X-based Overlay
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* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* x-overlay.c: X-based overlay interface design
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstxoverlay
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* @short_description: Interface for setting/getting a Window on elements
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* supporting it
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*
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* <refsect2>
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* <para>
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* The XOverlay interface is used for 2 main purposes :
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* <itemizedlist>
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* <listitem>
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* <para>
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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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* </para>
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* </listitem>
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* <listitem>
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* <para>
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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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* </para>
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* </listitem>
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* </itemizedlist>
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* </para>
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* <para>
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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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* </para>
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* <para>
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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-xwindow-id' element messages
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* if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
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* return GST_BUS_PASS;
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*
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* if (!gst_structure_has_name (message->structure, "prepare-xwindow-id"))
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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_x_overlay_set_window_handle (GST_X_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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* ...
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* }
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* ]|
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* </para>
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* </refsect2>
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* <refsect2>
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* <title>Two basic usage scenarios</title>
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* <para>
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* There are two basic usage scenarios: in the simplest case, the application
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* knows exactly what particular element is used for video output, which is
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* usually the case when the application creates the videosink to use
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* (e.g. #xvimagesink, #ximagesink, etc.) itself; in this case, the application
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* can just create the videosink element, create and realize the window to
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* render the video on and then call gst_x_overlay_set_window_handle() directly
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* with the XID or native window handle, before starting up the pipeline.
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* </para>
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* <para>
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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 or #gconfvideosink
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* is used. 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-xwindow-id 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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* </para>
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* <para>
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* As response to the prepare-xwindow-id element message in the bus sync
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* handler, the application may use gst_x_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-xwindow-id 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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* </para>
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* </refsect2>
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* <refsect2>
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* <title>GstXOverlay and Gtk+</title>
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* <para>
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* |[
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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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* ...
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* static gulong video_window_xid = 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-xwindow-id' element messages
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* if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
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* return GST_BUS_PASS;
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* if (!gst_structure_has_name (message->structure, "prepare-xwindow-id"))
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* return GST_BUS_PASS;
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*
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* if (video_window_xid != 0) {
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* GstXOverlay *xoverlay;
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*
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* // GST_MESSAGE_SRC (message) will be the video sink element
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* xoverlay = GST_X_OVERLAY (GST_MESSAGE_SRC (message));
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* gst_x_overlay_set_window_handle (xoverlay, video_window_xid);
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* } else {
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* g_warning ("Should have obtained video_window_xid 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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* // 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 GstXOverlay!");
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* #endif
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*
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* #ifdef GDK_WINDOWING_X11
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* video_window_xid = GDK_WINDOW_XID (video_window->window);
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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 before the pipeline is started up and the videosink
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* // asks for the XID of the window to render onto
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* gtk_widget_realize (window);
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*
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* // we should have the XID now
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* g_assert (video_window_xid != 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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* 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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* </para>
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* </refsect2>
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* <refsect2>
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* <title>GstXOverlay and Qt</title>
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* <para>
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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/interfaces/xoverlay.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_x_overlay_set_window_handle (GST_X_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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* </para>
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* </refsect2>
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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 "xoverlay.h"
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static void gst_x_overlay_base_init (gpointer g_class);
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GType
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gst_x_overlay_get_type (void)
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{
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static GType gst_x_overlay_type = 0;
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if (!gst_x_overlay_type) {
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static const GTypeInfo gst_x_overlay_info = {
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sizeof (GstXOverlayClass),
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gst_x_overlay_base_init,
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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_x_overlay_type = g_type_register_static (G_TYPE_INTERFACE,
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"GstXOverlay", &gst_x_overlay_info, 0);
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g_type_interface_add_prerequisite (gst_x_overlay_type,
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GST_TYPE_IMPLEMENTS_INTERFACE);
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}
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return gst_x_overlay_type;
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}
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static void
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gst_x_overlay_base_init (gpointer g_class)
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{
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}
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/**
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* gst_x_overlay_set_xwindow_id:
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* @overlay: a #GstXOverlay to set the XWindow on.
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* @xwindow_id: a #XID referencing the XWindow.
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*
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* This will call the video overlay's set_xwindow_id method. You should
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* use this method to tell to a XOverlay to display video output to a
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* specific XWindow. Passing 0 as the xwindow_id will tell the overlay to
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* stop using that window and create an internal one.
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*
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* Deprecated: Use gst_x_overlay_set_window_handle() instead.
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*/
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#ifndef GST_REMOVE_DEPRECATED
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#ifdef GST_DISABLE_DEPRECATED
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void gst_x_overlay_set_xwindow_id (GstXOverlay * overlay, gulong xwindow_id);
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#endif
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void
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gst_x_overlay_set_xwindow_id (GstXOverlay * overlay, gulong xwindow_id)
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{
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GST_WARNING_OBJECT (overlay,
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"Using deprecated gst_x_overlay_set_xwindow_id()");
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gst_x_overlay_set_window_handle (overlay, xwindow_id);
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}
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#endif
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/**
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* gst_x_overlay_set_window_handle:
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* @overlay: a #GstXOverlay to set the XWindow on.
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* @xwindow_id: a #XID referencing the XWindow.
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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 a XOverlay to display video output to a
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* specific XWindow. Passing 0 as the xwindow_id will tell the overlay to
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* stop using that window and create an internal one.
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*
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* Since: 0.10.31
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*/
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void
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gst_x_overlay_set_window_handle (GstXOverlay * overlay, guintptr handle)
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{
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GstXOverlayClass *klass;
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g_return_if_fail (overlay != NULL);
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g_return_if_fail (GST_IS_X_OVERLAY (overlay));
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klass = GST_X_OVERLAY_GET_CLASS (overlay);
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if (klass->set_window_handle) {
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klass->set_window_handle (overlay, handle);
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} else {
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#ifndef GST_REMOVE_DEPRECATED
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#ifdef GST_DISABLE_DEPRECATED
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#define set_xwindow_id set_xwindow_id_disabled
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#endif
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if (sizeof (guintptr) <= sizeof (gulong) && klass->set_xwindow_id) {
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GST_WARNING_OBJECT (overlay,
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"Calling deprecated set_xwindow_id() method");
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klass->set_xwindow_id (overlay, handle);
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} else {
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g_warning ("Refusing to cast guintptr to smaller gulong");
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}
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#endif
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}
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}
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/**
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* gst_x_overlay_got_xwindow_id:
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* @overlay: a #GstXOverlay which got a XWindow.
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* @xwindow_id: a #XID referencing the XWindow.
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*
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* This will post a "have-xwindow-id" 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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* Deprecated: Use gst_x_overlay_got_window_handle() instead.
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*/
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#ifndef GST_REMOVE_DEPRECATED
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#ifdef GST_DISABLE_DEPRECATED
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void gst_x_overlay_got_xwindow_id (GstXOverlay * overlay, gulong xwindow_id);
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#endif
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void
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gst_x_overlay_got_xwindow_id (GstXOverlay * overlay, gulong xwindow_id)
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{
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GST_WARNING_OBJECT (overlay,
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"Using deprecated gst_x_overlay_got_xwindow_id()");
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gst_x_overlay_got_window_handle (overlay, xwindow_id);
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}
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#endif
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/**
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* gst_x_overlay_got_window_handle:
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* @overlay: a #GstXOverlay 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-xwindow-id" 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_x_overlay_got_window_handle (GstXOverlay * 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_X_OVERLAY (overlay));
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GST_LOG_OBJECT (GST_OBJECT (overlay), "xwindow_id = %p", (gpointer)
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handle);
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s = gst_structure_new ("have-xwindow-id",
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"xwindow-id", G_TYPE_ULONG, (unsigned long) 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_x_overlay_prepare_xwindow_id:
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* @overlay: a #GstXOverlay which does not yet have an XWindow.
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*
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* This will post a "prepare-xwindow-id" element message on the bus
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* to give applications an opportunity to call
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* gst_x_overlay_set_xwindow_id() 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_x_overlay_prepare_xwindow_id (GstXOverlay * overlay)
|
|
{
|
|
GstStructure *s;
|
|
GstMessage *msg;
|
|
|
|
g_return_if_fail (overlay != NULL);
|
|
g_return_if_fail (GST_IS_X_OVERLAY (overlay));
|
|
|
|
GST_LOG_OBJECT (GST_OBJECT (overlay), "prepare xwindow_id");
|
|
s = gst_structure_new ("prepare-xwindow-id", NULL);
|
|
msg = gst_message_new_element (GST_OBJECT (overlay), s);
|
|
gst_element_post_message (GST_ELEMENT (overlay), msg);
|
|
}
|
|
|
|
/**
|
|
* gst_x_overlay_expose:
|
|
* @overlay: a #GstXOverlay to expose.
|
|
*
|
|
* Tell an overlay that it has been exposed. This will redraw the current frame
|
|
* in the drawable even if the pipeline is PAUSED.
|
|
*/
|
|
void
|
|
gst_x_overlay_expose (GstXOverlay * overlay)
|
|
{
|
|
GstXOverlayClass *klass;
|
|
|
|
g_return_if_fail (overlay != NULL);
|
|
g_return_if_fail (GST_IS_X_OVERLAY (overlay));
|
|
|
|
klass = GST_X_OVERLAY_GET_CLASS (overlay);
|
|
|
|
if (klass->expose) {
|
|
klass->expose (overlay);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_x_overlay_handle_events:
|
|
* @overlay: a #GstXOverlay to expose.
|
|
* @handle_events: a #gboolean indicating if events should be handled or not.
|
|
*
|
|
* Tell an overlay that it should handle events from the window system. These
|
|
* events are forwared 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 XOverlay.
|
|
*
|
|
* Since: 0.10.12
|
|
*/
|
|
void
|
|
gst_x_overlay_handle_events (GstXOverlay * overlay, gboolean handle_events)
|
|
{
|
|
GstXOverlayClass *klass;
|
|
|
|
g_return_if_fail (overlay != NULL);
|
|
g_return_if_fail (GST_IS_X_OVERLAY (overlay));
|
|
|
|
klass = GST_X_OVERLAY_GET_CLASS (overlay);
|
|
|
|
if (klass->handle_events) {
|
|
klass->handle_events (overlay, handle_events);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_x_overlay_set_render_rectangle:
|
|
* @overlay: a #GstXOverlay
|
|
* @x: the horizontal offset of the render area inside the window
|
|
* @y: the vertical offset of the render area inside the window
|
|
* @width: the width of the render area inside the window
|
|
* @height: the height of the render area inside the window
|
|
*
|
|
* Configure a subregion as a video target within the window set by
|
|
* gst_x_overlay_set_window_handle(). 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
|
|
* gst_x_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.
|
|
*
|
|
* Since: 0.10.29
|
|
*/
|
|
gboolean
|
|
gst_x_overlay_set_render_rectangle (GstXOverlay * overlay,
|
|
gint x, gint y, gint width, gint height)
|
|
{
|
|
GstXOverlayClass *klass;
|
|
|
|
g_return_val_if_fail (overlay != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_X_OVERLAY (overlay), FALSE);
|
|
g_return_val_if_fail ((width == -1 && height == -1) ||
|
|
(width > 0 && height > 0), FALSE);
|
|
|
|
klass = GST_X_OVERLAY_GET_CLASS (overlay);
|
|
|
|
if (klass->set_render_rectangle) {
|
|
klass->set_render_rectangle (overlay, x, y, width, height);
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|