[Bug 702840] queue2 does not work with use-buffering=true

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702840
  GStreamer | gst-plugins-base | git

--- Comment #9 from Wim Taymans <wim.taymans at gmail.com> 2014-03-24 11:06:27 UTC ---
commit a6decb91ac2c035c381d59f1f1fabfeb2f869f95
Author: Vincent Penquerc'h <vincent.penquerch at collabora.co.uk>
Date:   Thu Mar 20 06:14:33 2014 -0400

    queue2: fix event/preroll deadlock

    The qlock is released between popping a buffer from the queue
    and pushing it. When this buffer causes the sink to wait in
    preroll, this lets a query see that the queue is empty, and
    push the query then wait for it to be serviced. However, this
    will not be done till after peroll, and this will thus block.
    If upstream was waiting on buffering to reach 100% before
    switching to PLAYING, a deadlock would ensue.

    We fix it by refusing the query when buffering, as per Wim's
    recommendation on IRC.

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