[gst-devel] Playing Mp3 help

[Tiago Katcipis]

Basavaraj,
seeing your on_pad_added function it sens that you never connect the decoder
on the convert, and never connect the convert on the sink. The following is
missing after you connect the signal:

*  /* we link the elements together */
  /* file-source -> mp3-demuxer ~> mp3-decoder -> converter -> alsa-output
*/
  gst_element_link (source, demuxer);
  g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added),
decoder);
  **gst_element_link (decoder, conv);
  gst_element_link (conv**, sink);*


hope this helps you

best regards,
Katcipis

On Thu, Nov 19, 2009 at 11:40 AM, basavaraj P <basavarajp82 at gmail.com>wrote:

>
> Hello Katcipis,
>
> Following is the on_pad_added function.
>
> *static void
> on_pad_added (GstElement *element,
>               GstPad     *pad,
>               gpointer    data)
> {
>   GstPad *sinkpad;
>   GstElement *decoder = (GstElement *) data;
>
>   /* We can now link this pad with the mp3-decoder sink pad */
>   g_print ("Dynamic pad created, linking demuxer/decoder\n");
>
>   sinkpad = gst_element_get_static_pad (decoder, "sink");
>
>   gst_pad_link (pad, sinkpad);
>
>   gst_object_unref (sinkpad);
> }
> *
>
> Thanks,
> Basavaraj
>
>
>
>
> On Thu, Nov 19, 2009 at 3:11 PM, Tiago Katcipis <katcipis at inf.ufsc.br>wrote:
>
>> It would be easier if you show your on_pad_added function, and if you tell
>> exactly what error messages do you get when you run your application.
>>
>> To investigate the capabilities of a element you can use gst-inspect.
>>
>> On a terminal you can type for example:
>> gst-inspect flump3dec
>>
>> it will give an complete specification of the flump3dec element.
>>
>> best regards,
>> Katcipis
>>
>> On Thu, Nov 19, 2009 at 6:40 AM, basavaraj P <basavarajp82 at gmail.com>wrote:
>>
>>> Hello,
>>>
>>> Following is code which plays mp3 using playbin
>>>
>>> *  /* set up */
>>>   play = gst_element_factory_make ("playbin2", "play");
>>>   g_object_set (G_OBJECT (play), "uri",
>>> "file:///home/basavaraj/Music/JabSeTereNaina.mp3", NULL);
>>>
>>>   bus = gst_pipeline_get_bus (GST_PIPELINE (play));
>>> //  gst_bus_add_watch (bus, my_bus_callback, loop);
>>>   gst_object_unref (bus);
>>>
>>>   gst_element_set_state (play, GST_STATE_PLAYING);
>>> *
>>>
>>> Following is code which does not play mp3. Please help me what all
>>> plugins we need to connect and
>>> how to find their capabilities
>>>
>>> *  /* Create gstreamer elements */
>>>   GstElement* pipeline = gst_pipeline_new ("audio-player");
>>>   GstElement* source   = gst_element_factory_make ("filesrc",
>>> "file-source");
>>>   GstElement* demuxer  = gst_element_factory_make ("mpegdemux2",
>>> "mpeg-demuxer");
>>>   GstElement* decoder  = gst_element_factory_make ("flump3dec",
>>> "fluendo-decoder");
>>> //  GstElement* decoder = gst_element_factory_make("decodebin",
>>> "decoderbin");
>>>   GstElement* conv     = gst_element_factory_make ("audioconvert",
>>> "converter");
>>>   GstElement* sink     = gst_element_factory_make ("autoaudiosink",
>>> "audio-output");
>>>
>>>   if (!pipeline || !source || !demuxer || !decoder || !conv || !sink) {
>>>     g_printerr ("One element could not be created. Exiting.\n");
>>>     return -1;
>>>   }
>>>
>>>   /* Set up the pipeline */
>>>
>>>   /* we set the input filename to the source element */
>>> //  g_object_set (G_OBJECT (source), "uri",
>>> "file:///home/basavaraj/Music/Jab.mp3", NULL);
>>>   g_object_set (G_OBJECT (source), "location",
>>> "/home/basavaraj/Music/Jab.mp3", NULL);
>>>
>>>   /* we add a message handler */
>>>   GstBus *bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
>>>   gst_bus_add_watch (bus, bus_call, loop);
>>>   gst_object_unref (bus);
>>>
>>>   /* we add all elements into the pipeline */
>>>   /* file-source | mp3-demuxer | mp3-decoder | converter | alsa-output */
>>>   gst_bin_add_many (GST_BIN (pipeline),
>>>                     source, demuxer, decoder, conv, sink, NULL);
>>>
>>>   /* we link the elements together */
>>>   /* file-source -> mp3-demuxer ~> mp3-decoder -> converter ->
>>> alsa-output */
>>>   gst_element_link (source, demuxer);
>>>   g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added),
>>> decoder);
>>>
>>>   /* Set the pipeline to "playing" state*/
>>>   g_print ("Now playing: %s\n", argv[1]);
>>>   gst_element_set_state (pipeline, GST_STATE_PLAYING);
>>> *
>>>
>>> Thanks in advance,
>>> Basavaraj
>>>
>>>
>>>
>>>
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>>
>>
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-- 
"Se você se perder na selva africana, não precisa se desesperar. Basta
sentar em uma pedra e começar a instalar GNU/Linux em seu laptop. Em menos
de 5 minutos aparecerá alguém pra discordar de sua escolha de distribuição,
do particionamento, do gerenciador de janelas, do ambiente de desktop, do
editor de textos..."
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