[Bug 583890] v4l2: Implement V4L2_MEMORY_USERPTR support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=583890
  GStreamer | gst-plugins-good | git

--- Comment #38 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2013-11-26 12:38:46 UTC ---
Alright, I'm fine with a) having a way to force userptr behaviour and b) having
white-lists for automatically using that if nothing better can be used (e.g.
dmabuf) :) Just don't enable it by default for all devices, and also don't do
any unreliable probing of the capabilities.

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