[gst-devel] Odd problem playing wav file

[Tiago Katcipis]

hmm thanks for the help, im going to read more then. I got confused because
on gst-launch it worked, i didnt realized that gst-launch was linking
diferent.

On Thu, May 7, 2009 at 11:57 AM, Andrey Boyko <andreib at module.ru> wrote:

>  Because gst-launch as an application do it for you. I think in function
> gst_parse_perform_delayed_link in file grammar.tab.c.
>
>
> Tiago Katcipis wrote:
>
> but why does it work every time with gst-launch?
>
> On Thu, May 7, 2009 at 11:14 AM, Andrey Boyko <andreib at module.ru> wrote:
>
>>  wavparse element has 'sometimes' src pads so you can't just do
>> gst_element_link (wavparse, convert);
>> See
>> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.htmlsection 8.1.1 how to handle it.
>>
>> 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
>>
>> 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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>>
>>
>>
>
>
> --
> "it might be a profitable thing to learn Java, but it has no intellectual
> value whatsoever" Alexander Stepanov
>
>
>


-- 
"it might be a profitable thing to learn Java, but it has no intellectual
value whatsoever" Alexander Stepanov
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