[Bug 742917] v4l2: Allow scaling in the v4l2*convert element

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742917

--- Comment #15 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Answering myself:

(In reply to Nicolas Dufresne (stormer) from comment #13)
> I was on holiday. I accept the argument in comment 10. My only concern was
> around the granularity of the scaler and how do we handle it. Scaler often
> only support sizes with multiple of 2 or even 16. Also that concern that it
> may fail randomly since the kernel fixes to round S_FMT properly is still
> not merged yet.
> 
> Would it be possible to document you approach to handle a scaler that can
> only scale with multiple of 2 or 4 ?

To work properly in generic environment, the drive should implement enumeration
of formats. In that context, it will be able to use the step and range. The
rest will all be handled correctly automatically.

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