[gst-devel] problem with playing wav file

[Ganesh Kundapur]

Hi,
  I'm able to play the wav file by using gst-launch as fallows

gst-launch-0.10  filesrc location=~/songs/4voice.wav ! wavparse !
audioconvert ! alsasink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstAudioSinkClock
Caught interrupt -- handling interrupt.
Interrupt: Setting pipeline to PAUSED ...
Execution ended after 1914601000 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
FREEING pipeline ...


I modified the helloworld code to play the wav as
1. I created "waveparse" in place of oggdemux and vorbis  parser elements
2. Added filesrc, waveparse and alsasink to the pipeline and linked.

--
int
main ( int argc, char *argv[] )
{
        GMainLoop *loop;
        GstBus *bus;

        gst_init ( &argc, &argv );
        loop = g_main_loop_new ( NULL, FALSE );

         pipeline = gst_pipeline_new ( "audio-player" );
        source = gst_element_factory_make ( "filesrc", "file-source" );
        //parser = gst_element_factory_make ( "oggdemux", "ogg-parser" );
        parser = gst_element_factory_make ( "wavparse", "wave-parser" );
        //decoder = gst_element_factory_make ( "vorbisdec", "vorbis-decoder"
);
        conv = gst_element_factory_make ( "audioconvert", "converter" );
        sink = gst_element_factory_make ( "alsasink", "alsa-output" );

        if ( !pipeline || !source || !parser || !conv || !sink ) {
                g_print ( "One element could not be created\n" );
                return -1;
        }

        g_object_set (G_OBJECT (source), "location", argv[1], NULL );

        bus = gst_pipeline_get_bus ( GST_PIPELINE ( pipeline ) );
        gst_bus_add_watch ( bus, bus_call, loop );
        gst_object_unref ( bus );

        gst_bin_add_many ( GST_BIN ( pipeline), source, parser,
                           conv, sink, NULL );

        //gst_element_link ( source, parser );
        gst_element_link_many ( source, parser, conv, sink, NULL );
        g_signal_connect ( parser, "pad-added", G_CALLBACK ( new_pad ), NULL
);

        g_print ( "Setting to Playing\n" );
        gst_element_set_state ( pipeline, GST_STATE_PLAYING );
        g_print ( "Running\n" );
        g_main_loop_run ( loop );

        g_print ( "Returned, stopping playback\n" );
        gst_element_set_state ( pipeline, GST_STATE_NULL );
        g_print ( "Deleting pipeline\n" );

        gst_object_unref ( GST_OBJECT ( pipeline ) );

        return 0;
}
--


When i tried to run the fallowing code, i'm getting fallowing errors
--
./a.out ~/songs/4voice.wav
Setting to Playing
Running
Dynamic pad created, linking parser/decoder

(a.out:20136): GStreamer-CRITICAL **: gst_element_get_static_pad: assertion
`GST_IS_ELEMENT (element)' failed

(a.out:20136): GStreamer-CRITICAL **: gst_pad_link_prepare: assertion
`GST_IS_PAD (sinkpad)' failed

(a.out:20136): GStreamer-CRITICAL **: gst_object_unref: assertion `object !=
NULL' failed
Error: Internal data flow error.
Returned, stopping playback
Deleting pipeline
--

If i do without the dynamic pads, as
--
int
main (int argc, char *argv[])
{
  GstElement *bin, *filesrc, *decoder, *audiosink;
  GstElement *conv, *resample;

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

  /* also, we need to add some converters to make sure the audio stream
   * from the decoder is converted into a format the audio sink can
   * understand (if necessary) */
  conv = gst_element_factory_make ("audioconvert", "audioconvert");
  if (!conv) {
    g_print ("could not create \"audioconvert\" element!");
    return -1;
  }
  resample = gst_element_factory_make ("audioresample", "audioresample");
  if (!conv) {
    g_print ("could not create \"audioresample\" element!");
    return -1;
  }

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

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

  /* link the elements */
  gst_element_link_many (filesrc, decoder, conv, resample, audiosink, NULL);
  g_signal_connect ( decoder, "pad-added", G_CALLBACK (new_pad), 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);
}

I'm getting
--
./a.out ~/songs/4voice.wav
Dynamic pad created, linking parser/decoder
ERROR: from element /pipeline/decode: Internal data flow error.
Additional debug info:
gstwavparse.c(1719): gst_wavparse_loop (): /pipeline/decode:
streaming task paused, reason not-linked (-1)
--

It would be of great help if somebody look into this.


/Ganesh
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