gstreamer/tests/examples/gl/gtk/switchvideooverlay/main.cpp

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/*
* GStreamer
* Copyright (C) 2008-2009 Julien Isorce <julien.isorce@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <gst/gst.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include "../gstgtk.h"
static GstBusSyncReply create_window (GstBus* bus, GstMessage* message, GtkWidget* widget)
{
// ignore anything but 'prepare-window-handle' element messages
if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
return GST_BUS_PASS;
if (!gst_is_video_overlay_prepare_window_handle_message (message))
return GST_BUS_PASS;
g_print ("setting window handle %p\n", widget);
gst_video_overlay_set_gtk_window (GST_VIDEO_OVERLAY (GST_MESSAGE_SRC (message)), widget);
gst_message_unref (message);
return GST_BUS_DROP;
}
static void end_stream_cb(GstBus* bus, GstMessage* message, GstElement* pipeline)
{
g_print("End of stream\n");
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref(pipeline);
gtk_main_quit();
}
static gboolean expose_cb(GtkWidget* widget, cairo_t *cr, GstElement* videosink)
{
g_print ("expose %p\n", widget);
g_print ("event mask: 0x%x, button_press 0x%x\n", gtk_widget_get_events (widget), GDK_BUTTON_PRESS_MASK);
gst_video_overlay_expose (GST_VIDEO_OVERLAY (videosink));
return FALSE;
}
static gboolean on_click_drawing_area(GtkWidget* widget, GdkEventButton* event, GstElement* videosink)
{
g_print ("switch the drawing area %p\n", widget);
gst_video_overlay_set_gtk_window (GST_VIDEO_OVERLAY (videosink), widget);
gst_video_overlay_expose (GST_VIDEO_OVERLAY (videosink));
return FALSE;
}
static void destroy_cb(GtkWidget* widget, GdkEvent* event, GstElement* pipeline)
{
g_print("Close\n");
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref(pipeline);
gtk_main_quit();
}
static void button_state_null_cb(GtkWidget* widget, GstElement* pipeline)
{
gst_element_set_state (pipeline, GST_STATE_NULL);
g_print ("GST_STATE_NULL\n");
}
static void button_state_ready_cb(GtkWidget* widget, GstElement* pipeline)
{
gst_element_set_state (pipeline, GST_STATE_READY);
g_print ("GST_STATE_READY\n");
}
static void button_state_paused_cb(GtkWidget* widget, GstElement* pipeline)
{
gst_element_set_state (pipeline, GST_STATE_PAUSED);
g_print ("GST_STATE_PAUSED\n");
}
static void button_state_playing_cb(GtkWidget* widget, GstElement* pipeline)
{
gst_element_set_state (pipeline, GST_STATE_PLAYING);
g_print ("GST_STATE_PLAYING\n");
}
static void area_realize_cb(GtkWidget* widget, gpointer data)
{
g_print ("realize %p\n", widget);
if (!gdk_window_ensure_native (gtk_widget_get_window (widget)))
g_error ("Failed to create native window!");
//avoid flickering when resizing or obscuring the main window
gtk_widget_set_app_paintable(widget, TRUE);
gtk_widget_set_double_buffered(widget, FALSE);
}
gint main (gint argc, gchar *argv[])
{
gtk_init (&argc, &argv);
gst_init (&argc, &argv);
GstElement* pipeline = gst_pipeline_new ("pipeline");
//window that contains several ares where the video is drawn
GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_widget_set_size_request (window, 640, 240);
gtk_window_move (GTK_WINDOW (window), 300, 10);
gtk_window_set_title (GTK_WINDOW (window), "click on left, right or outside the main window to switch the drawing area");
GdkGeometry geometry;
geometry.min_width = 1;
geometry.min_height = 1;
geometry.max_width = -1;
geometry.max_height = -1;
gtk_window_set_geometry_hints (GTK_WINDOW (window), window, &geometry, GDK_HINT_MIN_SIZE);
//window to control the states
GtkWidget* window_control = gtk_window_new (GTK_WINDOW_TOPLEVEL);
geometry.min_width = 1;
geometry.min_height = 1;
geometry.max_width = -1;
geometry.max_height = -1;
gtk_window_set_geometry_hints (GTK_WINDOW (window_control), window_control, &geometry, GDK_HINT_MIN_SIZE);
gtk_window_set_resizable (GTK_WINDOW (window_control), FALSE);
gtk_window_move (GTK_WINDOW (window_control), 10, 10);
GtkWidget* table = gtk_grid_new ();
gtk_container_add (GTK_CONTAINER (window_control), table);
//control state null
GtkWidget* button_state_null = gtk_button_new_with_label ("GST_STATE_NULL");
g_signal_connect (G_OBJECT (button_state_null), "clicked",
G_CALLBACK (button_state_null_cb), pipeline);
gtk_grid_attach (GTK_GRID (table), button_state_null, 0, 0, 1, 1);
gtk_widget_show (button_state_null);
//control state ready
GtkWidget* button_state_ready = gtk_button_new_with_label ("GST_STATE_READY");
g_signal_connect (G_OBJECT (button_state_ready), "clicked",
G_CALLBACK (button_state_ready_cb), pipeline);
gtk_grid_attach (GTK_GRID (table), button_state_ready, 0, 1, 1, 1);
gtk_widget_show (button_state_ready);
//control state paused
GtkWidget* button_state_paused = gtk_button_new_with_label ("GST_STATE_PAUSED");
g_signal_connect (G_OBJECT (button_state_paused), "clicked",
G_CALLBACK (button_state_paused_cb), pipeline);
gtk_grid_attach (GTK_GRID (table), button_state_paused, 0, 2, 1, 1);
gtk_widget_show (button_state_paused);
//control state playing
GtkWidget* button_state_playing = gtk_button_new_with_label ("GST_STATE_PLAYING");
g_signal_connect (G_OBJECT (button_state_playing), "clicked",
G_CALLBACK (button_state_playing_cb), pipeline);
gtk_grid_attach (GTK_GRID (table), button_state_playing, 0, 3, 1, 1);
gtk_widget_show (button_state_playing);
gtk_widget_show (table);
gtk_widget_show (window_control);
//configure the pipeline
g_signal_connect(G_OBJECT(window), "delete-event", G_CALLBACK(destroy_cb), pipeline);
GstElement* videosrc = gst_element_factory_make ("videotestsrc", "videotestsrc");
GstElement* videosink = gst_element_factory_make ("glimagesink", "glimagesink");
gst_bin_add_many (GST_BIN (pipeline), videosrc, videosink, NULL);
gboolean link_ok = gst_element_link_many(videosrc, videosink, NULL);
if(!link_ok)
{
g_warning("Failed to link videosrc to videosink!\n") ;
return -1;
}
//areas where the video is drawn
GtkWidget* table_areas = gtk_grid_new ();
gtk_container_add (GTK_CONTAINER (window), table_areas);
GtkWidget* area_top_left = gtk_drawing_area_new();
gtk_widget_add_events(area_top_left, GDK_BUTTON_PRESS_MASK);
gtk_widget_set_size_request (area_top_left, 320, 240);
gtk_grid_attach (GTK_GRID (table_areas), area_top_left, 0, 0, 1, 1);
GtkWidget* area_top_right = gtk_drawing_area_new();
gtk_widget_add_events(area_top_right, GDK_BUTTON_PRESS_MASK);
gtk_widget_set_size_request (area_top_right, 320, 240);
gtk_grid_attach (GTK_GRID (table_areas), area_top_right, 1, 0, 1, 1);
//set window id on this event
g_signal_connect(area_top_left, "realize", G_CALLBACK(area_realize_cb), NULL);
g_signal_connect(area_top_right, "realize", G_CALLBACK(area_realize_cb), NULL);
gtk_widget_realize(area_top_left);
gtk_widget_realize(area_top_right);
GstBus* bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_set_sync_handler (bus, (GstBusSyncHandler) create_window, area_top_right, NULL);
gst_bus_add_signal_watch (bus);
g_signal_connect(bus, "message::error", G_CALLBACK(end_stream_cb), pipeline);
g_signal_connect(bus, "message::warning", G_CALLBACK(end_stream_cb), pipeline);
g_signal_connect(bus, "message::eos", G_CALLBACK(end_stream_cb), pipeline);
gst_object_unref (bus);
//needed when being in GST_STATE_READY, GST_STATE_PAUSED
//or resizing/obscuring the window
g_signal_connect(area_top_left, "draw", G_CALLBACK(expose_cb), videosink);
g_signal_connect(area_top_right, "draw", G_CALLBACK(expose_cb), videosink);
//switch the drawing area
g_signal_connect(area_top_left, "button-press-event", G_CALLBACK(on_click_drawing_area), videosink);
g_signal_connect(area_top_right, "button-press-event", G_CALLBACK(on_click_drawing_area), videosink);
gtk_widget_show_all (window);
gst_element_set_state(pipeline, GST_STATE_PLAYING);
gtk_main();
return 0;
}