[Bug 748405] glimagesink: balance change_state bufferpool/other_context ref/unref

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748405

--- Comment #4 from Matthieu Bouron <matthieu.bouron at collabora.com> ---
The following patch linked by Matthew on IRC fixes the the above issue:
 http://hastebin.com/ehuvomoyeg.coffee

There is another issue with the following pipeline:

videotestsrc ! glupload ! glcolorconvert ! gltransformation ! insertbin !
glimagesink

Adding an identity element to insertbin and then going to the READY state is
causing the original glwindow not to be destroyed and the glcontext is not
deactivated/freed.
The log shows that all glbufferpools have been deactivated.

Going back to PLAYING, adding a new identity element and then going back to
READY causes the second glwindow to be destroyed correctly and the context is
deactivated.

The original glwindow is still there.

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