[gst-devel] filesrc rewind

[august]

below is the test code I am using.  Now I have it looping an mp3 file.  

funny thing though that I can't call the seek on the decoder or something
other than osssink.  in fact, it only works when I check to see if the
decoder state is not playing and then send a seek event to osssink.  It
_doesnot_ work when I check to see if the filesrc is not playing and then
send the seek event to osssink.  

but this is just a simple pipline: 

	filesrc->decoder->osssink

what to do when it gets more complex, such as ???:

filesrc->decoder->queue
                        \
                         - adder->osssink
                        /
filesrc->decoder->queue


how to rewind or set a 
file on this one ?? : http://gstreamer.net/images/gst-editor-gstreamix.png

I have this pipeline structure working and playing two mp3 files, but
can't seek anywhere.

-august.





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

int main (int argc, char *argv[]) 
{
  GstElement *bin, *filesrc, *decoder, *osssink;
  GValue value = { 0, };
  gchar *str = 0;

  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", "decoderrr");
  if (!decoder) {
    g_print ("could not find plugin \"mad\"");
    return -1;
  }

	g_value_init (&value, G_TYPE_STRING);
	g_object_get_property (G_OBJECT (decoder), "name", &value);
	//g_object_set (G_OBJECT (decoder), "name", "mydecoder", NULL);
	str = g_strdup_value_contents (&value);
	g_print("%s name is %s",  GST_OBJECT_NAME (decoder), str);
	g_free(str);

  /* and an audio sink */
  osssink = gst_element_factory_make ("osssink", "play_audio");
  g_assert (osssink);

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

  /* link the elements */
  gst_element_link_many (filesrc, decoder, osssink, NULL);
  
  /* start playing */
  gst_element_set_state (bin, GST_STATE_PLAYING);
  g_print("\n\nstarting \n");
  while (1) {

    if (  ( gst_element_get_state( decoder ) ) == GST_STATE_PAUSED ) {
      GstEvent *s_event;
      gboolean audio_seek_worked = FALSE;
      
      gst_element_set_state(GST_ELEMENT(bin), GST_STATE_PAUSED);
      g_print("end of stream \n");
      
      s_event = gst_event_new_seek (GST_FORMAT_TIME |
				    GST_SEEK_METHOD_SET |
				    GST_SEEK_FLAG_FLUSH, 0);
      
      audio_seek_worked = gst_element_send_event ( GST_ELEMENT(osssink), s_event);
      if (audio_seek_worked) g_print("seeking  worked!!!\n");

      //gst_element_set_state(GST_ELEMENT(filesrc), GST_STATE_PLAYING);
      gst_element_set_state(GST_ELEMENT(bin), GST_STATE_PLAYING);

    }
    gst_bin_iterate (GST_BIN (bin));


  }
  g_print("ending \n");


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

  exit (0);
}