gstreamer/examples/helloworld/helloworld.c

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#include <stdlib.h>
#include <gst/gst.h>
static void
event_loop (GstElement * pipe)
{
GstBus *bus;
GstMessage *message = NULL;
bus = gst_element_get_bus (GST_ELEMENT (pipe));
while (TRUE) {
message = gst_bus_poll (bus, GST_MESSAGE_ANY, -1);
g_assert (message != NULL);
switch (message->type) {
case GST_MESSAGE_EOS:
gst_message_unref (message);
return;
case GST_MESSAGE_WARNING:
case GST_MESSAGE_ERROR:{
GError *gerror;
gchar *debug;
gst_message_parse_error (message, &gerror, &debug);
gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
gst_message_unref (message);
g_error_free (gerror);
g_free (debug);
return;
}
default:
gst_message_unref (message);
break;
}
}
}
int
main (int argc, char *argv[])
{
GstElement *bin, *filesrc, *decoder, *audiosink;
gst_init (&argc, &argv);
if (argc != 2) {
g_print ("usage: %s <mp3 file>\n", argv[0]);
exit (-1);
}
/* create a new bin to hold the elements */
bin = gst_pipeline_new ("pipeline");
g_assert (bin);
/* create a disk reader */
filesrc = gst_element_factory_make ("filesrc", "disk_source");
g_assert (filesrc);
g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL);
/* now it's time to get the decoder */
decoder = gst_element_factory_make ("mad", "decode");
if (!decoder) {
g_print ("could not find plugin \"mad\"");
return -1;
}
/* and an audio sink */
audiosink = gst_element_factory_make ("alsasink", "play_audio");
g_assert (audiosink);
/* add objects to the main pipeline */
gst_bin_add_many (GST_BIN (bin), filesrc, decoder, audiosink, NULL);
/* link the elements */
gst_element_link_many (filesrc, decoder, audiosink, NULL);
/* start playing */
gst_element_set_state (bin, GST_STATE_PLAYING);
/* Run event loop listening for bus messages until EOS or ERROR */
event_loop (bin);
/* stop the bin */
gst_element_set_state (bin, GST_STATE_NULL);
exit (0);
}