[Bug 779466] v4l2: improve v4l2dec auto-negotiation

[GStreamer (GNOME Bugzilla)]

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

Florent Thiéry <florent.thiery at ubicast.eu> changed:

           What    |Removed                     |Added
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                 CC|                            |florent.thiery at ubicast.eu

--- Comment #19 from Florent Thiéry <florent.thiery at ubicast.eu> ---
I use a v4l driver that does not support DMABUF, and right now this patch
triggers the use of DMABUF. 

The errno is ENOTTY, but the code checks for -ENOTTY, is that a typo ?

  if (errno == -ENOTTY)
    ret = FALSE;

See https://bugzilla.gnome.org/show_bug.cgi?id=790940

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