[gst-devel] Playing Mp3 help

[Jyoti]

Case 1:
The below pipeline should play any mp3 file.

gst-launch -v filesrc location=song.mp3 ! mad ! audioconvert ! audioresample
! autoaudiosink

Case 2:
And optionally if the file has id3 tags then use

gst-launch -v filesrc location=song.mp3 ! id3demux ! mad ! audioconvert !
audioresample ! autoaudiosink

You need to additional install mad(mp3 decoder).

Only in case 2 you need to have the callback for "pad-added" signal. Check
out the helloworld example and similar
from manual.


On Thu, Nov 19, 2009 at 4:14 PM, Lukas Ruetz <lukas.ruetz at gmx.at> wrote:

> Hi,
>
> Am Donnerstag, den 19.11.2009, 07:41 -0200 schrieb Tiago Katcipis:
> > 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
>
>
> Try this pipeline to play mp3s. Because it's audio-only (beside
> mp3-tags) you don't need a demuxer.
>
> gst-launch-0.10 -v filesrc location=song.mp3 ! mp3parse ! flump3dec !
> audioconvert ! audioresample ! autoaudiosink
>
> hth,
> lukas
>
>
>
>
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