[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #3 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Another note, don't forget about the stream change support, would make no sense
to not add this too. Very often in GStreamer we know if advanced that the
stream properties have changes (even for resolution change). So what we do in
this case is drain the decoder, reset(), setup() and start again. Very few
decoder do support a complete format change asynchronously. So if we know in
advanced, better do it synchronously.

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