[Bug 769802] queue2: Post buffering messages earlier in ringbuffer mode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769802

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 333182
  --> https://bugzilla.gnome.org/attachment.cgi?id=333182&action=edit
queue2: Post buffering messages earlier in ringbuffer mode

In ringbuffer mode we need to make sure we post buffering messages *before*
blocking to wait for data to be drained.

Without this, we would end up in situations like this:
* pipeline is pre-rolling
* Downstream demuxer/decoder has pushed data to all sinks, and demuxer thread
  is blocking downstream (i.e. not pulling from upstream/queue2).
* Therefore pipeline has pre-rolled ...
* ... but queue2 hasn't filled up yet, therefore the application waits for
  the buffering 100% messages before setting the pipeline to PLAYING
* But queue2 can't post that message, since the 100% message will be posted
  *after* there is room available for that last buffer.

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