#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);
}

static void
cb_handoff(GstElement *fakesink, GstBuffer *buffer, GstPad *pad, gpointer user_data)
{
  g_print("cb_handoff()\n");
}

static void
cb_preroll_handoff(GstElement *fakesink, GstBuffer *buffer, GstPad *pad, gpointer user_data)
{
  g_print("cb_preroll_handoff()\n");
}

int
main (int argc, char *argv[])
{
  GstElement *bin, *filesrc, *decoder, *sink;

  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", "file_src");
  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 ("mpegpsdemux", "decode");
  if (!decoder) {
    g_print ("could not find plugin \"mpegpsdemux\"\n");
    return -1;
  }

  /* and an audio sink */
  sink = gst_element_factory_make ("fakesink", "fake_sink");
  g_assert (sink);
  g_object_set (G_OBJECT (sink), "signal-handoffs", TRUE,  NULL);
  g_signal_connect (sink, "handoff", G_CALLBACK (cb_handoff), NULL);
  g_signal_connect (sink, "preroll-handoff", G_CALLBACK (cb_preroll_handoff), NULL);

  g_object_set (G_OBJECT (sink), "sync", TRUE,  NULL);

  /* add objects to the main pipeline */
  gst_bin_add_many (GST_BIN (bin), filesrc, decoder, sink, NULL);

  /* link the elements */
  gst_element_link_many (filesrc, decoder, sink, 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);
}
