[Bug 779146] dmabuf: be able to negotiate tiled surfaces

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779146

--- Comment #15 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
More of less, GstDmabufMeta, will first only implement the modifiers. Modifiers
are still negotiated through the allocation query, and then set in this meta.
Not all modifiers will go through this though, e.g. the Samsung Tile won't, as
it already has GST_VIDEO_FORMAT_NV12_64Z32 that matches, and the memory control
won't "fix it" if you map it. So the format from userspace point of view is the
same as the hardware one.

Why using a generic meta name, well, there is other type of information that
would later be attached. One potential subject being discussed, is the Y-FLIP
flags (specific to some DMABuf create from GL using specific stack, not sure
anything else then Renesas behaves this way ...)

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