Reading "wav" file in "C"

[Adrien Schwartzentruber]

  gst_element_link(src,parse);
  gst_element_link(dec,sink);

Try to replace by :
  gst_element_link_many(src, parse, dec, NULL);

The callback pad_added is never called because this element isn't linked to
the parser.

Also, use the environment variable GST_DEBUG to get more debug
informations.
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-checklist-debug.html

Another good way to debug, is to generate dot file of the pipeline. See :
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstInfo.html#GST-DEBUG-BIN-TO-DOT-FILE:CAPS


On Wed, Feb 5, 2014 at 12:46 PM, aft <aftnix at gmail.com> wrote:

> Hi,
>
> I'm trying to implement the following pipeline in 'C':
>
>     arif at dev:~/GS_samples/cmd_GS$gst-launch-0.10 filesrc
> location="../sample_media/M1F1-Alaw-AFsp.wav" ! wavparse ! alawdec !
> autoaudiosink
>
>
> Here is the implementation which i have written
>
>     #include <gst/gst.h>
>
>     void on_pad_added(GstElement *src_element, GstPad *src_pad, gpointer
> data);
>     static gboolean bus_cb(GstBus *bus, GstMessage *message, gpointer
> data);
>
>     static GMainLoop *loop;
>
>     int main(int argc, char **argv) {
>
>     GstElement *pipeline;
>     GstElement *src;
>     GstElement *dec;
>     GstElement *parse;
>     GstElement *sink;
>     GstBus *bus;
>
>     gst_init(&argc, &argv);
>
>     loop = g_main_loop_new (NULL, FALSE);
>
>     pipeline = gst_pipeline_new("wav_player");
>
>     src = gst_element_factory_make("filesrc","src");
>     sink = gst_element_factory_make("autoaudiosink","sink");
>     parse = gst_element_factory_make("wavparse","parse");
>     dec = gst_element_factory_make("alawdec", "dec");
>
>     gst_bin_add_many (GST_BIN(pipeline), src,parse,dec,sink, NULL);
>     g_object_set( G_OBJECT (src) , "location",argv[1], NULL);
>
>     gst_element_link(src,parse);
>     gst_element_link(dec,sink);
>     g_signal_connect (dec, "pad-added", G_CALLBACK (on_pad_added), dec);
>
>     bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
>     gst_bus_add_watch (bus, bus_cb, NULL);
>     gst_object_unref(bus);
>     gst_element_set_state(pipeline, GST_STATE_PLAYING);
>     g_main_loop_run(loop);
>     return 0;
>
>     }
>
>     void on_pad_added (GstElement *src_element, GstPad *src_pad, gpointer
> data)
>     {
>     g_print ("linking dynamic pad ...\n");
>
>     GstElement *sink_element = (GstElement *) data;
>     GstPad *sink_pad = gst_element_get_static_pad(sink_element, "sink");
>     gst_pad_link (src_pad, sink_pad);
>     gst_object_unref(sink_pad);
>
>     }
>
>     static gboolean bus_cb(GstBus *bus, GstMessage *message, gpointer
>  data)
>     {
>       g_print ("Got %s message\n", GST_MESSAGE_TYPE_NAME (message));
>
>       switch (GST_MESSAGE_TYPE (message)) {
>         case GST_MESSAGE_ERROR: {
>           GError *err;
>           gchar *debug;
>
>           gst_message_parse_error (message, &err, &debug);
>           g_print ("Error: %s\n", err->message);
>           g_error_free (err);
>           g_free (debug);
>
>           g_main_loop_quit (loop);
>           break;
>         }
>         case GST_MESSAGE_EOS:
>           /* end-of-stream */
>           g_main_loop_quit (loop);
>           break;
>         default:
>           /* unhandled message */
>           break;
>       }
>
>       /* we want to be notified again the next time there is a message
>        * on the bus, so returning TRUE (FALSE means we want to stop
> watching
>        * for messages on the bus and our callback should not be called
> again)
>        */
>       return TRUE;
>     }
>
>
> But this does not work :
>
>     arif at dev:~/GS_samples/cmd_GS$./a.out
> ../sample_media/M1F1-Alaw-AFsp.wav
>     Got state-changed message
>     Got state-changed message
>     Got stream-status message
>     Got tag message
>     Got error message
>     Error: Internal data flow error.
> --
> -Cheers
> -Arif
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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