[gst-devel] Odd problem playing wav file

[Tiago Katcipis]

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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