[gst-devel] Odd problem playing wav file

[Tiago Katcipis]

thanks fot the hints Wim. Im going to read more before posting now.

On Thu, May 7, 2009 at 12:19 PM, Wim Taymans <wim.taymans at gmail.com> wrote:

> On Thu, 2009-05-07 at 10:23 -0300, Tiago Katcipis wrote:
> > Im having some trouble making a wav player, when i try to build the
> > pipeline using gst-launch it works fine, but the source code building
> > the same pipeline generates an error. Im sorry if the question is
> > stupid, im new at gstreamer and im not getting what im doing
> > wrong :-(. I followed an example i found on gstreamer documentation.
> >
> > The gst-launch comand:
> > gst-launch filesrc location="exemploWav.wav" ! wavparse !
> > audioconvert ! gconfaudiosink
>
> Hi,
>
> Check the result codes from various methods (hint some elements will not
> link correctly. Another hint, read some more about dynamic pads)
>
> Wim
> >
> > The source code that builds the same pipe (or at least it should
> > build):
> > #include <gst/gst.h>
> > #include <glib.h>
> >
> > static gboolean
> > bus_call (GstBus     *bus,
> >           GstMessage *msg,
> >           gpointer    data)
> > {
> >   GMainLoop *loop = (GMainLoop *) data;
> >
> >   switch (GST_MESSAGE_TYPE (msg)) {
> >
> >     case GST_MESSAGE_EOS:
> >       g_print ("End of stream\n");
> >       g_main_loop_quit (loop);
> >       break;
> >
> >     case GST_MESSAGE_ERROR: {
> >       gchar  *debug;
> >       GError *error;
> >
> >       gst_message_parse_error (msg, &error, &debug);
> >       g_free (debug);
> >
> >       g_printerr ("Error: %s\n", error->message);
> >       g_error_free (error);
> >
> >       g_main_loop_quit (loop);
> >       break;
> >     }
> >     default:
> >       g_print("Teste.....[%d]\n", GST_MESSAGE_TYPE (msg));
> >       break;
> >   }
> >
> >   return TRUE;
> > }
> >
> > int
> > main (int   argc,
> >       char *argv[])
> > {
> >   GMainLoop *loop;
> >
> >   GstElement *pipeline, *source, *sink, *convert, *wavparse;
> >   GstBus *bus;
> >
> >   /* Initialisation */
> >   gst_init (&argc, &argv);
> >
> >   loop = g_main_loop_new (NULL, FALSE);
> >
> >   /* Check input arguments */
> >   if (argc != 2) {
> >     g_printerr ("Usage: %s <Wav filename>\n", argv[0]);
> >     return -1;
> >   }
> >
> >   /* Create gstreamer elements */
> >   pipeline = gst_pipeline_new ("wav_player");
> >   source   = gst_element_factory_make ("filesrc",
> > "file_source");
> >   wavparse = gst_element_factory_make ("wavparse",      "wav_parser");
> >   convert  = gst_element_factory_make ("audioconvert",
> > "audio_convert");
> >   sink     = gst_element_factory_make
> > ("gconfaudiosink","gnome_output");
> >
> >   if (!pipeline || !source || !sink || !convert || !wavparse ) {
> >     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), "location", argv[1], NULL);
> >
> >   /* we add a message handler */
> >   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 */
> >   gst_bin_add_many (GST_BIN (pipeline),
> >                     source, convert, wavparse, sink, NULL);
> >
> >   /* we link the elements together */
> >   gst_element_link (source, wavparse);
> >   gst_element_link (wavparse, convert);
> >   gst_element_link (convert, sink);
> >
> >
> >   /* Set the pipeline to "playing" state*/
> >   g_print ("Now playing: %s\n", argv[1]);
> >   gst_element_set_state (pipeline, GST_STATE_PLAYING);
> >
> >
> >   /* Iterate */
> >   g_print ("Running...\n");
> >   g_main_loop_run (loop);
> >
> >   /* Out of the main loop, clean up nicely */
> >   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;
> > }
> >
> > The error:
> > Error: Erro no fluxo interno de dados. (something like "Error on
> > internal data flow").
> >
> > best regards,
> > Katcipis
> >
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> i700
> Series Scanner you'll get full speed at 300 dpi even with all image
> processing features enabled. http://p.sf.net/sfu/kodak-com
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