gstreamer/examples/helloworld/helloworld.c

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

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

  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");

  /* create a disk reader */
  filesrc = gst_elementfactory_make("filesrc", "disk_source");
  g_object_set(G_OBJECT(filesrc),"location", argv[1],NULL);

  /* now it's time to get the decoder */
  decoder = gst_elementfactory_make("mad","parse");
  if (!decoder) {
    g_print ("could not find plugin \"mad\"");
    return -1;
  }
  /* and an audio sink */
  osssink = gst_elementfactory_make("osssink", "play_audio");

  /* add objects to the main pipeline */
  gst_bin_add(GST_BIN(bin), filesrc);
  gst_bin_add(GST_BIN(bin), decoder);
  gst_bin_add(GST_BIN(bin), osssink);

  /* connect src to sink */
  gst_pad_connect(gst_element_get_pad(filesrc,"src"),
                  gst_element_get_pad(decoder,"sink"));
  gst_pad_connect(gst_element_get_pad(decoder,"src"),
                  gst_element_get_pad(osssink,"sink"));

  /* start playing */
  gst_element_set_state(bin, GST_STATE_PLAYING);

  while (gst_bin_iterate(GST_BIN(bin)));

  /* stop the bin */
  gst_element_set_state(bin, GST_STATE_NULL);

  exit(0);
}