[gst-devel] please correct for me about the construction of a simple player...

[Volter Yen]

Hi all,
  I want to make my simple palyer with gstreamer plugin,
the test script is :
gst-launch-0.10 filesrc location=testmediafile ! *demux name=demux d.! queue !*decoded ! audioconvert!.... d. !queue !*decodec ! ffmpegcolorsapce....
(the way above can work properly) I tried to find some example on the subject,but the document on the gstreamer.com do little help with me for this case,
I have tried to do that as the following:main piple :
                              |--a_queue ---*decodec--videooutbin
            filesrc--*demuxer-|
                              |--v_queue ---*decodec--audiooutbin
audio out process :
           construct a bin,which contains:
           audioconvert--...--audiosink
           constrcut a ghost pad for audio out bin
video out process :
           construct a bin,which contains:
           ffmepgcolorsapce--...--videosink
           constrcut a ghost pad for video out binlink each element
  .........and my piple is :int build_pipeline(gchar *location)
{
  GstElement *filesrc;
  GstElement *a_dec,*a_conv,*audiosink,*a_resample,*a_queue;
  GstStateChangeReturn ret;
  GstPad *audiopad,*queuesinkpad,*queuesrcpad;
 
  g_print("vesion 20070907\n");
  sleep(2);  // create a new pipeline to hold the elements
  pipeline = gst_pipeline_new ("pipe"); // create file source element
 filesrc = gst_element_factory_make ("filesrc", "source");
  if (!filesrc )
    {
    g_print ("source element could not be created\n");
  return -1;
  }
 g_object_set (G_OBJECT (filesrc), "location", location, NULL);
  gst_bin_add (GST_BIN (pipeline), filesrc);  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
  gst_bus_add_watch (bus, bus_call, loop);
  gst_object_unref (bus);// create ts demux element
 ts_demux = gst_element_factory_make ("flutsdemux", "ts_demux");
 if (!ts_demux )
    {
    g_print ("ts_demux element could not be created\n");
  return -1;
  } 
  gst_bin_add (GST_BIN (pipeline), ts_demux); gst_element_link (filesrc, ts_demux);
 
//audio process....
//create a queue bettwen demuxer and decoder, link ts_demux with queue
 a_queue = gst_element_factory_make ("queue", "a_queue");
 if (!a_queue )
    {
      g_print ("a_queue element could not be created\n");
  return -1;
  } gst_bin_add (GST_BIN (pipeline), a_queue);
 gst_element_set_state (a_queue, GST_STATE_READY);
 queuesinkpad = gst_element_get_pad (a_queue, "sink");
 queuesrcpad = gst_element_get_pad (a_queue, "src"); gst_pad_link (gst_element_get_pad (ts_demux, "audio_%02d"), queuesinkpad); //create audio decoder and link queue with a_dec
  a_dec = gst_element_factory_make ("flump3dec", "a_dec");
 gst_bin_add (GST_BIN (pipeline), a_dec);
 gst_pad_link (queuesrcpad,gst_element_get_pad (a_dec, "sink") ); //create audio out bin
   audio=gst_bin_new ("audio");
   a_conv = gst_element_factory_make ("audioconvert", "a_conv");
   a_resample=gst_element_factory_make ("audioresample", "a_resample");
   audiosink = gst_element_factory_make ("alsasink", "audiosink");
   if ( !a_conv || !a_resample || !audiosink) {
      g_print ("One element could not be created\n");
   return -1;
    }
   
  gst_bin_add_many (GST_BIN (audio), a_conv,a_resample,audiosink,NULL);
   gst_element_link_many (a_conv,a_resample,audiosink,NULL);
 
 //create ghost pad
   audiopad = gst_element_get_pad (a_conv, "sink");
   gst_element_add_pad (audio,gst_ghost_pad_new ("sink", audiopad));
   gst_bin_add (GST_BIN (pipeline), audio);
  //link a_dec with audio out bin
 gst_pad_link (gst_element_get_pad (a_dec, "src"),audiopad );
 gst_object_unref (audiopad);
 
   ret = gst_element_set_state (audio, GST_STATE_PLAYING);
   if (ret != GST_STATE_CHANGE_SUCCESS)
        g_printf("\nset audio out state : change state Expection!\n");   //video process.......
//....
      ret = gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
  if (ret != GST_STATE_CHANGE_SUCCESS)
      g_printf("\nset pipeline bin state : change state Expection!\n");
   
   return 0;
} but when excuting gst_element_set_state to GST_STATE_PLAYING,the final state is GST_STATE_CHANGE_ASYNC....I don't know how to process it?maybe there is some problem with the mianframe of my program ?can anybody help me or give me some related example?Thank you!
Volter
 
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