[maemo-developers] problem with playing wav file

[From: 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
--

Somebody already posted the similar problem in the mailing list (
http://lists.maemo.org/pipermail/maemo-developers/2006-August/023007.html ),
but solution is not mentioned over there.

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

Thanks,
Ganesh
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