[gst-devel] Need help on using decodebin as media decoder

[Fariq Izwan]

Hi good people,

I'm new to gstreamer and I have a problem of using decodebin as a decoder to
play video file. Below is my sample code that I use. The code below runs
fine for one stream of media. But if I want to play both streams(audio and
video), it doesn't work.
Can anyone tell me what I did wrong here? (Please don't suggest to use
playbin) :)

Thank you.

Fariq.

####Sample code####

#include <gst/gst.h>
#include <glib-2.0/glib/gprintf.h>
#include <gstreamer-0.10/gst/gstelement.h>
#include <glib-2.0/glib/gmessages.h>

GstElement *pipeline, *audio,*video,*audioqueue,*videoqueue;

static void
cb_newpad (GstElement *decodebin,
       GstPad     *pad,
       gboolean    last,
       gpointer    data)
{
  GstPad *audiopad,*videopad;

  /* link audiopad */
  audiopad = gst_element_get_static_pad (audio, "sink");
  if (!GST_PAD_IS_LINKED (audiopad)) {
      gst_pad_link (pad, audiopad);
      g_print("audiopad has been linked");
    g_object_unref (audiopad);
    return;
  }
/* link videopad */
  videopad = gst_element_get_static_pad(video,"sink");
  if (!GST_PAD_IS_LINKED (videopad)) {
      gst_pad_link(pad,videopad);
      gst_element_link(videoqueue,video);
    g_object_unref (videopad);
    return;
  }
}

gint
main (gint   argc,
      gchar *argv[])
{
  GMainLoop *loop;
  GstElement *src, *dec, *conv, *sink, *typefind,*typefind2;//*myplugin;
  GstElement *convVid,*videosink;
  GstPad *audiopad,*videopad;
  GstBus *bus;

  /* init GStreamer */
  gst_init (&argc, &argv);
  loop = g_main_loop_new (NULL, FALSE);

  /* make sure we have input */
  if (argc != 2) {
    g_print ("Usage: %s <filename>\n", argv[0]);
    return -1;
  }

  g_print("Playing %s \n",argv[1]);

  /* setup */
  pipeline = gst_pipeline_new ("pipeline");

  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
  gst_bus_add_watch (bus, my_bus_callback, loop);
  gst_object_unref (bus);

  src = gst_element_factory_make ("filesrc", "source");
  g_object_set (G_OBJECT (src), "location", argv[1], NULL);
  typefind = gst_element_factory_make("typefind","typefinder");
  g_signal_connect(typefind,"have-type",G_CALLBACK(typefound_cb),loop);
  dec = gst_element_factory_make ("decodebin", "decoder");
  g_signal_connect (dec, "new-decoded-pad", G_CALLBACK (cb_newpad), NULL);
  //myplugin = gst_element_factory_make("myplugin","MyPlugin");
  audioqueue = gst_element_factory_make("queue","audioqueue");
  videoqueue = gst_element_factory_make("queue","videoqueue");
  gst_bin_add_many (GST_BIN (pipeline), src,typefind,dec,NULL);
  gst_element_link_many (src,typefind,dec,NULL);

  /* create audio output */
  audio = gst_bin_new ("audiobin");
  conv = gst_element_factory_make ("audioconvert", "aconv");
  typefind2 = gst_element_factory_make("typefind","typefinder2");
  //g_signal_connect(typefind2,"have-type",G_CALLBACK(typefound_cb),loop);
  audiopad = gst_element_get_static_pad (audioqueue, "sink");
  sink = gst_element_factory_make ("osssink", "sink");
  gst_bin_add_many (GST_BIN (audio),audioqueue,conv,typefind2, sink, NULL);
  gst_element_link_many (audioqueue,conv,typefind2, sink,NULL);
  gst_element_add_pad (audio,
      gst_ghost_pad_new ("sink", audiopad));
  gst_object_unref (audiopad);
  gst_bin_add (GST_BIN (pipeline), audio);

  /* create video output */
  video = gst_bin_new("videobin");
  convVid = gst_element_factory_make("ffmpegcolorspace","converter");
  videopad = gst_element_get_static_pad(videoqueue,"sink");
  videosink = gst_element_factory_make("xvimagesink","videosink");
  gst_bin_add_many(GST_BIN(video),videoqueue,convVid,videosink,NULL);
  gst_element_link_many(videoqueue,convVid,videosink,NULL);
  gst_element_add_pad(video,gst_ghost_pad_new("sink",videopad));
  gst_object_unref(videopad);
  gst_bin_add(GST_BIN(pipeline),video);

  /* run */
  gst_element_set_state (pipeline, GST_STATE_PLAYING);
  g_timeout_add (200, (GSourceFunc) cb_print_position, pipeline);
  g_main_loop_run (loop);

  /* cleanup */
  gst_element_set_state (pipeline, GST_STATE_NULL);
  gst_object_unref (GST_OBJECT (pipeline));

  return 0;
}
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