[Bug 797010] vaapipostproc: implement the negotiation of memory:DMABuf in sink pad

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797010

--- Comment #5 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
So, I had a bit of time to look around, Vaapi gained support for this by
introducing VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME_2. We should port all DMABuf
exportation usage to that. There is a new export method, which will provide the
modififers. Then we can in a first place fail the export if there is a
modififers and eventually expose the exported buffers with the modifiers. On
the VPP side, I bet we can influence the modifiers that will be used somehow, I
haven't search yet.

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