#include <gst/gst.h> #include <glib.h> static gboolean my_bus_callback (GstBus *bus, GstMessage *msg, gpointer data) { GMainLoop *loop = (GMainLoop *) data; switch (GST_MESSAGE_TYPE (msg)) { case GST_MESSAGE_EOS: g_print ("End of stream\n"); g_main_loop_quit (loop); break; case GST_MESSAGE_ERROR: { gchar *debug; GError *error; gst_message_parse_error (msg, &error, &debug); g_free (debug); g_printerr ("Error: %s\n", error->message); g_error_free (error); g_main_loop_quit (loop); break; } default: break; } return TRUE; } static gboolean idle_exit_loop (gpointer data) { g_main_loop_quit ((GMainLoop *) data); /* once */ return FALSE; } static void cb_typefound (GstElement *typefind, guint probability, GstCaps *caps, gpointer data) { GMainLoop *loop = data; gchar *type; type = gst_caps_to_string (caps); g_print ("Media type %s found, probability %d%%\n", type, probability); g_free (type); /* since we connect to a signal in the pipeline thread context, we need * to set an idle handler to exit the main loop in the mainloop context. * Normally, your app should not need to worry about such things. */ g_idle_add (idle_exit_loop, loop); } gint main (gint argc, gchar *argv[]) { GMainLoop *loop; GstElement *pipeline, *filesrc, *typefind, *fakesink; GstBus *bus; /* init GStreamer */ gst_init (&argc, &argv); loop = g_main_loop_new (NULL, FALSE); /* check args */ if (argc != 2) { g_print ("Usage: %s <filename>\n", argv[0]); return -1; } /* create a new pipeline to hold the elements */ pipeline = gst_pipeline_new ("pipe"); bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline)); gst_bus_add_watch (bus, my_bus_callback, NULL); gst_object_unref (bus); /* create file source and typefind element */ filesrc = gst_element_factory_make ("filesrc", "source"); g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL); typefind = gst_element_factory_make ("typefind", "typefinder"); g_signal_connect (typefind, "have-type", G_CALLBACK (cb_typefound), loop); fakesink = gst_element_factory_make ("fakesink", "sink"); /* setup */ gst_bin_add_many (GST_BIN (pipeline), filesrc, typefind, fakesink, NULL); gst_element_link_many (filesrc, typefind, fakesink, NULL); gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING); g_main_loop_run (loop); /* unset */ gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL); gst_object_unref (GST_OBJECT (pipeline)); return 0; }