[gst-devel] Odd problem playing wav file

[Wim Taymans]

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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