[Bug 739801] Need to change DEFAULT_{AUDIO, VIDEO}SINK in application running time

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739801
  GStreamer | gst-plugins-base | unspecified

--- Comment #4 from Justin Joy <justin.joy.9to5 at gmail.com> 2014-11-18 13:23:45 UTC ---
I am very appreciate for your attention even though I missed something
important to explain.
Perhaps, this patch would be only for me, but I want to help if there's someone
who have similar situation. :)

This is my application layers.

--------
Player (Uncontrollable)
--------
Gstreamer Helper Functions (Controllable)
--------
Gstreamer (Controllable)
-------- 

In the player layer, they call the helper function like this, but I can't
access and modify the codes of the player. To help understand, I'll describe
pseudo codes.

  pipeline = create_pipeline_by_helper ();

I provide the helper function, create_pipeline_by_helper, as a library. It
looks like that.

create_pipeline_by_helpder() {

  playbin = create_playbin();

  conf = get_configuration_from_file();

  set_configuration (playbin, conf);

  return playbin;
}


The configuration file has several properties related to playbin or pipeline
like this.

[playbin]
#default-video-sink=debugvideosink
default-video-sink=releasevideosink
#default-audio-sink=debugaudiosink
default-audio-sink=releaseaudiosink


The requirement of my patch was from this idea.
For convenience of debugging, I just want to replace default sink element
without compilation and with the closed upper layers.

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