[Bug 779466] v4l2: improve v4l2dec auto-negotiation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779466

--- Comment #9 from Michael Tretter <m.tretter at pengutronix.de> ---
(In reply to Nicolas Dufresne (stormer) from comment #8)
> Review of attachment 347048 [details] [review]:
> 
> This check was alread implemented in the GstV4l2Allocator code, I was
> wondering if it was usable, otherwise we should clean it up, and remove.

I cannot find a check in the GstV4l2Allocator code. The allocator tries to
export the dmabuf only if the mode of the GstV4l2Object was set to
GST_V4L2_IO_DMABUF before and handles the export failures. You can change the
mode via properties, but if you do not specify the mode (because you are using
playbin), it will always use GST_V4L2_IO_MMAP.

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