[Bug 783627] gstvideodecoder.c: excessive locking triggering many deadlocks

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783627

--- Comment #7 from minfrin at sharp.fm ---
Just learned that the stream lock is recursive and as I understand can be
called multiple times from the same thread.

gstvideodecoder.c in this case is being called from gstomxvideodec.c - in this
case the OMX video hardware is processed by two different threads, one thread
feeds data into the GPU, and the second thread pulls data out of the GPU.

>From what I can see this causes potential problems with locking, as a query
from one thread can be blocked on the other, which is in turn waiting for the
first thread to be ready to receive data.

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