gstreamer/tests/examples/launch/mp3parselaunch.c

#include <stdio.h>
#include <stdlib.h>
#include <gst/gst.h>

static void
event_loop (GstElement * pipe)
{
  GstBus *bus;
  GstMessage *message = NULL;
  gboolean running = TRUE;

  bus = gst_element_get_bus (GST_ELEMENT (pipe));

  while (running) {
    message = gst_bus_poll (bus, GST_MESSAGE_ANY, -1);

    g_assert (message != NULL);

    switch (message->type) {
      case GST_MESSAGE_EOS:
        running = FALSE;
        break;
      case GST_MESSAGE_WARNING:{
        GError *gerror;
        gchar *debug;

        gst_message_parse_warning (message, &gerror, &debug);
        gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
        g_error_free (gerror);
        g_free (debug);
        break;
      }
      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);
        g_error_free (gerror);
        g_free (debug);
        running = FALSE;
        break;
      }
      default:
        break;
    }
    gst_message_unref (message);
  }
  gst_object_unref (bus);
}

int
main (int argc, char *argv[])
{
  GstElement *bin;
  GstElement *filesrc;
  GError *error = NULL;

  gst_init (&argc, &argv);

  if (argc != 2) {
    g_print ("usage: %s <mp3 file>\n", argv[0]);
    exit (-1);
  }

  bin = (GstElement *)
      gst_parse_launch ("filesrc name=my_filesrc ! mad ! osssink", &error);
  if (!bin) {
    fprintf (stderr, "Parse error: %s", error->message);
    exit (-1);
  }

  filesrc = gst_bin_get_by_name (GST_BIN (bin), "my_filesrc");
  g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL);
  gst_object_unref (filesrc);

  /* 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);
}