[Bug 583890] v4l2: Implement V4L2_MEMORY_DMABUF/USERPTR support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=583890

Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|v4l2: Implement             |v4l2: Implement
                   |V4L2_MEMORY_USERPTR support |V4L2_MEMORY_DMABUF/USERPTR
                   |                            |support

--- Comment #66 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Working on this now, this patch is really the very first step. I'll merge
immediately as without that the pipeline just stall if you force
io-mode=userptr and the downstream buffer size didn't match what the driver
expected. Of course, there is plenty of ways the size can match but yet, the
buffer isn't right, so more validation will come.

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