gstreamer/subprojects/gst-docs/examples/bus_example.c

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#include <gst/gst.h>
static GMainLoop *loop;
static gboolean
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my_bus_callback (GstBus * bus, GstMessage * message, gpointer data)
{
g_print ("Got %s message\n", GST_MESSAGE_TYPE_NAME (message));
switch (GST_MESSAGE_TYPE (message)) {
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case GST_MESSAGE_ERROR:{
GError *err;
gchar *debug;
gst_message_parse_error (message, &err, &debug);
g_print ("Error: %s\n", err->message);
g_error_free (err);
g_free (debug);
g_main_loop_quit (loop);
break;
}
case GST_MESSAGE_EOS:
/* end-of-stream */
g_main_loop_quit (loop);
break;
default:
/* unhandled message */
break;
}
/* we want to be notified again the next time there is a message
* on the bus, so returning TRUE (FALSE means we want to stop watching
* for messages on the bus and our callback should not be called again)
*/
return TRUE;
}
gint
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main (gint argc, gchar * argv[])
{
GstElement *pipeline;
GstBus *bus;
guint bus_watch_id;
/* init */
gst_init (&argc, &argv);
/* create pipeline, add handler */
pipeline = gst_pipeline_new ("my_pipeline");
/* adds a watch for new message on our pipeline's message bus to
* the default GLib main context, which is the main context that our
* GLib main loop is attached to below
*/
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
bus_watch_id = gst_bus_add_watch (bus, my_bus_callback, NULL);
gst_object_unref (bus);
/* [...] */
/* create a mainloop that runs/iterates the default GLib main context
* (context NULL), in other words: makes the context check if anything
* it watches for has happened. When a message has been posted on the
* bus, the default main context will automatically call our
* my_bus_callback() function to notify us of that message.
* The main loop will be run until someone calls g_main_loop_quit()
*/
loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (loop);
/* clean up */
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
g_source_remove (bus_watch_id);
g_main_loop_unref (loop);
return 0;
}