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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #20 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Benjamin Gaignard from comment #17)
> shm, egl or dmabuf are allocation methods so I believe we have to add them
> as allocator in wayland pool. In this way it will be up to the upstream
> element to select the wanted allocator and not decide this while creating
> the pipeline by putting different elements for each allocation method.

No, because only shm can be allocated, the rest comes from upstream.

> 
> Until now wayland dmabuf protocol doesn't propose to allocate the memory so
> what we have done is to use libdrm to allocate dumb buffers and get a file
> descriptor with prime interface. I think it is fair enough since most (even
> all) systems using wayland are drm based.

Which is Intel specific, and most likely not mappable on any other driver. I'm
sorry, but adding DRM code in there was and is still a bad idea.

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