gstreamer/examples/queue3/queue3.c

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

gboolean playing;

/* eos will be called when the src element has an end of stream */
void eos(GstElement *element, gpointer data) 
{
  g_print("have eos, quitting\n");

  playing = FALSE;
}

int main(int argc,char *argv[]) 
{
  GstElement *disksrc, *osssink, *queue, *parse, *decode;
  GstElement *bin;
  GstElement *thread;

  gst_init(&argc,&argv);

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

  /* create a new thread to hold the elements */
  thread = gst_thread_new("thread");
  g_assert(thread != NULL);

  /* create a new bin to hold the elements */
  bin = gst_bin_new("bin");
  g_assert(bin != NULL);

  /* create a disk reader */
  disksrc = gst_elementfactory_make("disksrc", "disk_source");
  g_assert(disksrc != NULL);
  g_object_set(G_OBJECT(disksrc),"location", argv[1],NULL);
  g_signal_connect(G_OBJECT(disksrc),"eos",
                     G_CALLBACK(eos), thread);

  queue = gst_elementfactory_make("queue", "queue");

  /* and an audio sink */
  osssink = gst_elementfactory_make("osssink", "play_audio");
  g_assert(osssink != NULL);

  parse = gst_elementfactory_make("mp3parse", "parse");
  decode = gst_elementfactory_make("mpg123", "decode");

  /* add objects to the main bin */
  gst_bin_add(GST_BIN(bin), disksrc);
  gst_bin_add(GST_BIN(bin), queue);

  gst_bin_add(GST_BIN(thread), parse);
  gst_bin_add(GST_BIN(thread), decode);
  gst_bin_add(GST_BIN(thread), osssink);
  
  gst_pad_connect(gst_element_get_pad(disksrc,"src"),
                  gst_element_get_pad(queue,"sink"));

  gst_pad_connect(gst_element_get_pad(queue,"src"),
                  gst_element_get_pad(parse,"sink"));
  gst_pad_connect(gst_element_get_pad(parse,"src"),
                  gst_element_get_pad(decode,"sink"));
  gst_pad_connect(gst_element_get_pad(decode,"src"),
                  gst_element_get_pad(osssink,"sink"));

  gst_bin_add(GST_BIN(bin), thread);

  /* make it ready */
  gst_element_set_state(GST_ELEMENT(bin), GST_STATE_READY);
  /* start playing */
  gst_element_set_state(GST_ELEMENT(bin), GST_STATE_PLAYING);

  playing = TRUE;

  while (playing) {
    gst_bin_iterate(GST_BIN(bin));
  }

  gst_element_set_state(GST_ELEMENT(bin), GST_STATE_NULL);

  exit(0);
}