[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752962

--- Comment #24 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to kevin from comment #23)
> Do need wait event before g_fmt () of CAPTURE? or driver should wait and
> ensure get right video format?

These ioctl() are meant to be synchronous, but deterministic (they should not
really block longer then the time is takes to read/write the information). This
is where pushing a head, and immediatly doing g_fmt() is not correct (and why
the V4L2_EVENT_SOURCE_CHANGE is needed here).

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