#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-xwindow-id' element messages if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT) return GST_BUS_PASS; if (!gst_structure_has_name (message->structure, "prepare-xwindow-id")) return GST_BUS_PASS; g_print ("setting xwindow id\n"); gst_x_overlay_set_gtk_window (GST_X_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, GdkEventExpose* event, GstElement* videosink) { gst_x_overlay_expose (GST_X_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 gchar* slider_fps_cb (GtkScale* scale, gdouble value, GstElement* pipeline) { //change the video frame rate dynamically return g_strdup_printf ("video framerate: %0.*g", gtk_scale_get_digits (scale), value); } gint main (gint argc, gchar *argv[]) { gtk_init (&argc, &argv); gst_init (&argc, &argv); GstElement* pipeline = gst_pipeline_new ("pipeline"); //window that contains an area where the video is drawn GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_widget_set_size_request (window, 640, 480); gtk_window_move (GTK_WINDOW (window), 300, 10); gtk_window_set_title (GTK_WINDOW (window), "glimagesink implement the gstxoverlay interface"); 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_table_new (2, 1, TRUE); 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_table_attach_defaults (GTK_TABLE (table), button_state_null, 0, 1, 0, 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_table_attach_defaults (GTK_TABLE (table), button_state_ready, 0, 1, 1, 2); 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_table_attach_defaults (GTK_TABLE (table), button_state_paused, 0, 1, 2, 3); 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_table_attach_defaults (GTK_TABLE (table), button_state_playing, 0, 1, 3, 4); gtk_widget_show (button_state_playing); //change framerate GtkWidget* slider_fps = gtk_vscale_new_with_range (1, 30, 2); g_signal_connect (G_OBJECT (slider_fps), "format-value", G_CALLBACK (slider_fps_cb), pipeline); gtk_table_attach_defaults (GTK_TABLE (table), slider_fps, 1, 2, 0, 4); gtk_widget_show (slider_fps); 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"); GstCaps *caps = gst_caps_new_simple("video/x-raw-yuv", "width", G_TYPE_INT, 640, "height", G_TYPE_INT, 480, "framerate", GST_TYPE_FRACTION, 25, 1, "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'), NULL) ; gst_bin_add_many (GST_BIN (pipeline), videosrc, videosink, NULL); gboolean link_ok = gst_element_link_filtered(videosrc, videosink, caps) ; gst_caps_unref(caps) ; if(!link_ok) { g_warning("Failed to link videosrc to videosink!\n") ; return -1; } //area where the video is drawn GtkWidget* area = gtk_drawing_area_new(); gtk_container_add (GTK_CONTAINER (window), area); //avoid flickering when resizing or obscuring the main window gtk_widget_realize(area); gdk_window_set_back_pixmap(area->window, NULL, FALSE); gtk_widget_set_app_paintable(area,TRUE); gtk_widget_set_double_buffered(area, FALSE); //set window id on this event GstBus* bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline)); gst_bus_set_sync_handler (bus, (GstBusSyncHandler) create_window, area); 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, "expose-event", G_CALLBACK(expose_cb), videosink); //start GstStateChangeReturn ret = gst_element_set_state (pipeline, GST_STATE_PLAYING); if (ret == GST_STATE_CHANGE_FAILURE) { g_print ("Failed to start up pipeline!\n"); return -1; } gtk_widget_show_all (window); gtk_main(); return 0; }