[Bug 711155] wayland: add wl_drm support to wayland sink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=711155

Olivier Crête <olivier.crete at ocrete.ca> changed:

           What    |Removed                     |Added
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                 CC|                            |olivier.crete at ocrete.ca

--- Comment #64 from Olivier Crête <olivier.crete at ocrete.ca> ---
(In reply to Daniel Stone from comment #63)
> Right, I just meant in terms of potentially performing any flush at map /
> invalidation at unmap, for either caches or compressed buffers, or whatever.
> You'd have to have map() and unmap() plumbed through to the allocator,
> rather than a single fixed allocation. But I'm pretty sure this happens
> today, right?

The "download" should happen on the first call to gst_memory_map() and the
upload/flush/etc should be done by the sink.. Otherwise you may end up doing
multiple download/flushes as different elements may map/unmap the memory.

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