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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #28 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to George Kiagiadakis from comment #27)
> The problem is, you cannot mix dumb buffers with hw decoder/camera buffers,
> and they are not the same in terms of acceleration.

There is exception to that. With UVC driver, you can pass dumb buffer (using
DMABUF or USERPTR) and it remains the fastest path. It will always work since
this driver uses vmalloc and has no alignment requirement. In latest (or
future?) this driver will also export dmabuf, which are backed by virtual
memory, hence might not be usable if you graphic driver requires CMA or SG.

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