5 #include <gst/interfaces/xoverlay.h>
8 #if defined (GDK_WINDOWING_X11)
10 #elif defined (GDK_WINDOWING_WIN32)
11 #include <gdk/gdkwin32.h>
12 #elif defined (GDK_WINDOWING_QUARTZ)
13 #include <gdk/gdkquartzwindow.h>
16 /* Structure to contain all our information, so we can pass it around */
17 typedef struct _CustomData {
18 GstElement *playbin2; /* Our one and only pipeline */
20 GtkWidget *slider; /* Slider widget to keep track of current position */
21 GtkWidget *streams_list; /* Text widget to display info about the streams */
22 gulong slider_update_signal_id; /* Signal ID for the slider update signal */
24 GstState state; /* Current state of the pipeline */
25 gint64 duration; /* Duration of the clip, in nanoseconds */
28 /* This function is called when the GUI toolkit creates the physical window that will hold the video.
29 * At this point we can retrieve its handler (which has a different meaning depending on the windowing system)
30 * and pass it to GStreamer through the XOverlay interface. */
31 static void realize_cb (GtkWidget *widget, CustomData *data) {
32 GdkWindow *window = gtk_widget_get_window (widget);
33 guintptr window_handle;
35 if (!gdk_window_ensure_native (window))
36 g_error ("Couldn't create native window needed for GstXOverlay!");
38 /* Retrieve window handler from GDK */
39 #if defined (GDK_WINDOWING_WIN32)
40 window_handle = (guintptr)GDK_WINDOW_HWND (window);
41 #elif defined (GDK_WINDOWING_QUARTZ)
42 window_handle = gdk_quartz_window_get_nsview (window);
43 #elif defined (GDK_WINDOWING_X11)
44 window_handle = GDK_WINDOW_XID (window);
46 /* Pass it to playbin2, which implements XOverlay and will forward it to the video sink */
47 gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->playbin2), window_handle);
50 /* This function is called when the PLAY button is clicked */
51 static void play_cb (GtkButton *button, CustomData *data) {
52 gst_element_set_state (data->playbin2, GST_STATE_PLAYING);
55 /* This function is called when the PAUSE button is clicked */
56 static void pause_cb (GtkButton *button, CustomData *data) {
57 gst_element_set_state (data->playbin2, GST_STATE_PAUSED);
60 /* This function is called when the STOP button is clicked */
61 static void stop_cb (GtkButton *button, CustomData *data) {
62 gst_element_set_state (data->playbin2, GST_STATE_READY);
65 /* This function is called when the main window is closed */
66 static void delete_event_cb (GtkWidget *widget, GdkEvent *event, CustomData *data) {
71 /* This function is called everytime the video window needs to be redrawn (due to damage/exposure,
72 * rescaling, etc). GStreamer takes care of this in the PAUSED and PLAYING states, otherwise,
73 * we simply draw a black rectangle to avoid garbage showing up. */
74 static gboolean expose_cb (GtkWidget *widget, GdkEventExpose *event, CustomData *data) {
75 if (data->state < GST_STATE_PAUSED) {
76 GtkAllocation allocation;
77 GdkWindow *window = gtk_widget_get_window (widget);
80 /* Cairo is a 2D graphics library which we use here to clean the video window.
81 * It is used by GStreamer for other reasons, so it will always be available to us. */
82 gtk_widget_get_allocation (widget, &allocation);
83 cr = gdk_cairo_create (window);
84 cairo_set_source_rgb (cr, 0, 0, 0);
85 cairo_rectangle (cr, 0, 0, allocation.width, allocation.height);
93 /* This function is called when the slider changes its position. We perform a seek to the
94 * new position here. */
95 static void slider_cb (GtkRange *range, CustomData *data) {
96 gdouble value = gtk_range_get_value (GTK_RANGE (data->slider));
97 gst_element_seek_simple (data->playbin2, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
98 (gint64)(value * GST_SECOND));
101 /* This creates all the GTK+ widgets that compose our application, and registers the callbacks */
102 static void create_ui (CustomData *data) {
103 GtkWidget *main_window; /* The uppermost window, containing all other windows */
104 GtkWidget *video_window; /* The drawing area where the video will be shown */
105 GtkWidget *main_box; /* VBox to hold main_hbox and the controls */
106 GtkWidget *main_hbox; /* HBox to hold the video_window and the stream info text widget */
107 GtkWidget *controls; /* HBox to hold the buttons and the slider */
108 GtkWidget *play_button, *pause_button, *stop_button; /* Buttons */
110 main_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
111 g_signal_connect (G_OBJECT (main_window), "delete-event", G_CALLBACK (delete_event_cb), data);
113 video_window = gtk_drawing_area_new ();
114 gtk_widget_set_double_buffered (video_window, FALSE);
115 g_signal_connect (video_window, "realize", G_CALLBACK (realize_cb), data);
116 g_signal_connect (video_window, "expose_event", G_CALLBACK (expose_cb), data);
118 play_button = gtk_button_new_from_stock (GTK_STOCK_MEDIA_PLAY);
119 g_signal_connect (G_OBJECT (play_button), "clicked", G_CALLBACK (play_cb), data);
121 pause_button = gtk_button_new_from_stock (GTK_STOCK_MEDIA_PAUSE);
122 g_signal_connect (G_OBJECT (pause_button), "clicked", G_CALLBACK (pause_cb), data);
124 stop_button = gtk_button_new_from_stock (GTK_STOCK_MEDIA_STOP);
125 g_signal_connect (G_OBJECT (stop_button), "clicked", G_CALLBACK (stop_cb), data);
127 data->slider = gtk_hscale_new_with_range (0, 100, 1);
128 gtk_scale_set_draw_value (GTK_SCALE (data->slider), 0);
129 data->slider_update_signal_id = g_signal_connect (G_OBJECT (data->slider), "value-changed", G_CALLBACK (slider_cb), data);
131 data->streams_list = gtk_text_view_new ();
132 gtk_text_view_set_editable (GTK_TEXT_VIEW (data->streams_list), FALSE);
134 controls = gtk_hbox_new (FALSE, 0);
135 gtk_box_pack_start (GTK_BOX (controls), play_button, FALSE, FALSE, 2);
136 gtk_box_pack_start (GTK_BOX (controls), pause_button, FALSE, FALSE, 2);
137 gtk_box_pack_start (GTK_BOX (controls), stop_button, FALSE, FALSE, 2);
138 gtk_box_pack_start (GTK_BOX (controls), data->slider, TRUE, TRUE, 2);
140 main_hbox = gtk_hbox_new (FALSE, 0);
141 gtk_box_pack_start (GTK_BOX (main_hbox), video_window, TRUE, TRUE, 0);
142 gtk_box_pack_start (GTK_BOX (main_hbox), data->streams_list, FALSE, FALSE, 2);
144 main_box = gtk_vbox_new (FALSE, 0);
145 gtk_box_pack_start (GTK_BOX (main_box), main_hbox, TRUE, TRUE, 0);
146 gtk_box_pack_start (GTK_BOX (main_box), controls, FALSE, FALSE, 0);
147 gtk_container_add (GTK_CONTAINER (main_window), main_box);
148 gtk_window_set_default_size (GTK_WINDOW (main_window), 640, 480);
150 gtk_widget_show_all (main_window);
153 /* This function is called periodically to refresh the GUI */
154 static gboolean refresh_ui (CustomData *data) {
155 GstFormat fmt = GST_FORMAT_TIME;
158 /* We do not want to update anything unless we are in the PAUSED or PLAYING states */
159 if (data->state < GST_STATE_PAUSED)
162 /* If we didn't know it yet, query the stream duration */
163 if (!GST_CLOCK_TIME_IS_VALID (data->duration)) {
164 if (!gst_element_query_duration (data->playbin2, &fmt, &data->duration)) {
165 g_printerr ("Could not query current duration.\n");
167 /* Set the range of the slider to the clip duration, in SECONDS */
168 gtk_range_set_range (GTK_RANGE (data->slider), 0, (gdouble)data->duration / GST_SECOND);
172 if (gst_element_query_position (data->playbin2, &fmt, ¤t)) {
173 /* Block the "value-changed" signal, so the slider_cb function is not called
174 * (which would trigger a seek the user has not requested) */
175 g_signal_handler_block (data->slider, data->slider_update_signal_id);
176 /* Set the position of the slider to the current pipeline positoin, in SECONDS */
177 gtk_range_set_value (GTK_RANGE (data->slider), (gdouble)current / GST_SECOND);
178 /* Re-enable the signal */
179 g_signal_handler_unblock (data->slider, data->slider_update_signal_id);
184 /* This function is called when new metadata is discovered in the stream */
185 static void tags_cb (GstElement *playbin2, gint stream, CustomData *data) {
186 /* We are possibly in a GStreamer working thread, so we notify the main
187 * thread of this event through a message in the bus */
188 gst_element_post_message (playbin2,
189 gst_message_new_application (GST_OBJECT (playbin2),
190 gst_structure_new ("tags-changed", NULL)));
193 /* This function is called when an error message is posted on the bus */
194 static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
198 /* Print error details on the screen */
199 gst_message_parse_error (msg, &err, &debug_info);
200 g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
201 g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
202 g_clear_error (&err);
205 /* Set the pipeline to READY (which stops playback) */
206 gst_element_set_state (data->playbin2, GST_STATE_READY);
209 /* This function is called when an End-Of-Stream message is posted on the bus.
210 * We just set the pipeline to READY (which stops playback) */
211 static void eos_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
212 g_print ("End-Of-Stream reached.\n");
213 gst_element_set_state (data->playbin2, GST_STATE_READY);
216 /* This function is called when the pipeline changes states. We use it to
217 * keep track of the current state. */
218 static void state_changed_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
219 GstState old_state, new_state, pending_state;
220 gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
221 if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->playbin2)) {
222 data->state = new_state;
223 g_print ("State set to %s\n", gst_element_state_get_name (new_state));
224 if (old_state == GST_STATE_READY && new_state == GST_STATE_PAUSED) {
225 /* For extra responsiveness, we refresh the GUI as soon as we reach the PAUSED state */
231 /* Extract metadata from all the streams and write it to the text widget in the GUI */
232 static void analyze_streams (CustomData *data) {
235 gchar *str, *total_str;
237 gint n_video, n_audio, n_text;
240 /* Clean current contents of the widget */
241 text = gtk_text_view_get_buffer (GTK_TEXT_VIEW (data->streams_list));
242 gtk_text_buffer_set_text (text, "", -1);
244 /* Read some properties */
245 g_object_get (data->playbin2, "n-video", &n_video, NULL);
246 g_object_get (data->playbin2, "n-audio", &n_audio, NULL);
247 g_object_get (data->playbin2, "n-text", &n_text, NULL);
249 for (i = 0; i < n_video; i++) {
251 /* Retrieve the stream's video tags */
252 g_signal_emit_by_name (data->playbin2, "get-video-tags", i, &tags);
254 total_str = g_strdup_printf ("video stream %d:\n", i);
255 gtk_text_buffer_insert_at_cursor (text, total_str, -1);
257 gst_tag_list_get_string (tags, GST_TAG_VIDEO_CODEC, &str);
258 total_str = g_strdup_printf (" codec: %s\n", str ? str : "unknown");
259 gtk_text_buffer_insert_at_cursor (text, total_str, -1);
262 gst_tag_list_free (tags);
266 for (i = 0; i < n_audio; i++) {
268 /* Retrieve the stream's audio tags */
269 g_signal_emit_by_name (data->playbin2, "get-audio-tags", i, &tags);
271 total_str = g_strdup_printf ("\naudio stream %d:\n", i);
272 gtk_text_buffer_insert_at_cursor (text, total_str, -1);
274 if (gst_tag_list_get_string (tags, GST_TAG_AUDIO_CODEC, &str)) {
275 total_str = g_strdup_printf (" codec: %s\n", str);
276 gtk_text_buffer_insert_at_cursor (text, total_str, -1);
280 if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
281 total_str = g_strdup_printf (" language: %s\n", str);
282 gtk_text_buffer_insert_at_cursor (text, total_str, -1);
286 if (gst_tag_list_get_uint (tags, GST_TAG_BITRATE, &rate)) {
287 total_str = g_strdup_printf (" bitrate: %d\n", rate);
288 gtk_text_buffer_insert_at_cursor (text, total_str, -1);
291 gst_tag_list_free (tags);
295 for (i = 0; i < n_text; i++) {
297 /* Retrieve the stream's subtitle tags */
298 g_signal_emit_by_name (data->playbin2, "get-text-tags", i, &tags);
300 total_str = g_strdup_printf ("\nsubtitle stream %d:\n", i);
301 gtk_text_buffer_insert_at_cursor (text, total_str, -1);
303 if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
304 total_str = g_strdup_printf (" language: %s\n", str);
305 gtk_text_buffer_insert_at_cursor (text, total_str, -1);
309 gst_tag_list_free (tags);
314 /* This function is called when an "application" message is posted on the bus.
315 * Here we retrieve the message posted by the tags_cb callback */
316 static void application_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
317 if (g_strcmp0 (gst_structure_get_name (msg->structure), "tags-changed") == 0) {
318 /* If the message is the "tags-changed" (only one we are currently issuing), update
319 * the stream info GUI */
320 analyze_streams (data);
324 int main(int argc, char *argv[]) {
326 GstStateChangeReturn ret;
330 gtk_init (&argc, &argv);
332 /* Initialize GStreamer */
333 gst_init (&argc, &argv);
335 /* Initialize our data structure */
336 memset (&data, 0, sizeof (data));
337 data.duration = GST_CLOCK_TIME_NONE;
339 /* Create the elements */
340 data.playbin2 = gst_element_factory_make ("playbin2", "playbin2");
342 if (!data.playbin2) {
343 g_printerr ("Not all elements could be created.\n");
347 /* Set the URI to play */
348 g_object_set (data.playbin2, "uri", "http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
350 /* Connect to interesting signals in playbin2 */
351 g_signal_connect (G_OBJECT (data.playbin2), "video-tags-changed", (GCallback) tags_cb, &data);
352 g_signal_connect (G_OBJECT (data.playbin2), "audio-tags-changed", (GCallback) tags_cb, &data);
353 g_signal_connect (G_OBJECT (data.playbin2), "text-tags-changed", (GCallback) tags_cb, &data);
358 /* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
359 bus = gst_element_get_bus (data.playbin2);
360 gst_bus_add_signal_watch (bus);
361 g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, &data);
362 g_signal_connect (G_OBJECT (bus), "message::eos", (GCallback)eos_cb, &data);
363 g_signal_connect (G_OBJECT (bus), "message::state-changed", (GCallback)state_changed_cb, &data);
364 g_signal_connect (G_OBJECT (bus), "message::application", (GCallback)application_cb, &data);
365 gst_object_unref (bus);
368 ret = gst_element_set_state (data.playbin2, GST_STATE_PLAYING);
369 if (ret == GST_STATE_CHANGE_FAILURE) {
370 g_printerr ("Unable to set the pipeline to the playing state.\n");
371 gst_object_unref (data.playbin2);
375 /* Register a function that GLib will call every second */
376 g_timeout_add_seconds (1, (GSourceFunc)refresh_ui, &data);
378 /* Start the GTK main loop. We will not regain control until gtk_main_quit is called. */
382 gst_element_set_state (data.playbin2, GST_STATE_NULL);
383 gst_object_unref (data.playbin2);