[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #16 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to kevin from comment #15)
> Yes, I will make one patch to move poll out of buffer pool.

If you can explain your design, that might require few iterations.

> 
> How to keep SOURCE_CHANGE backward compatible?

You should first detect that it's not supported. Normally registering an event
that does not exist shall return -1 with errno ENOTTY (probably that we don't
care, any error means not supported really).

Then if it's not supported, I expect the code to behave (you can still more
some of it to the loop) like before, which means after sending the header,
simply calling G_FMT (acquire_format()) and expecting it to reply immediately,
and fail if no answer.

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