[Bug 733235] decodebin:Handle the multi-queue size flexible

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=733235

--- Comment #17 from Justin J. Kim <justin.joy.9to5 at gmail.com> ---
> And have a mechanism (like a signal), in which application could allow the queue to grow bigger.

I'm testing some codes to explain a draft idea. :) but you already mentioned.

1. add 'more-memory-for-preroll' to decodebin

 gint64 more-memory-for-preroll (GstElement *decodebin, gint64 growing_size)

2. if there's no signal handler, decodebin sets mq size as predefined size
(like Myungsun's codes)

3. if user adds signal handler, decodebin uses the return value of signal.
   (-1: immediately fail, 0: managed by application, n: growing size)

How about my proposal?

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