[Bug 583890] v4l2: Implement V4L2_MEMORY_USERPTR support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #64 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Sure, I have no problem with that. Now, it's not "changing" the user requested
io-mode. That would not be correct. The default io-mode is called "auto". Right
now it's auto in the sense that it will choose between legacy read/write and
mmap. What Julien's patch was doing, is to add on top to that the ability to
automatically import external memory into that driver using USERPTR. Due to
alignment, type of memory and other restrictions, one cannot assume that will
always work, so this comes with a fallback to mmap. It's similar for DMABuf
importation.

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