[Bug 768079] waylandsink: add support wayland presentation time interface

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768079

--- Comment #5 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
The traces are not self explanatory, hence need work indeed. Remember this is
early work.

Using prepare() is very important, since the render function is synchronised.
It would prevent you from doing any kind of adaptation. I'll probably be able
to dive again in this work next week, and will probably provide initial support
for preroll and unlock.

If I remember correctly, the sync happens on the clock thread (which is also
running the WL queue, for race free handling). Prepare just wait for a slot to
be free in the two buffer queue. You can unlock that easily.

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