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

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742917
  GStreamer | gst-plugins-good | unspecified

--- Comment #2 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> 2015-01-14 14:28:22 UTC ---
Thanks Enrico for this patch, I'll have a look as soon as possible. Meanwhile,
I have few general question:

Is this negotiation code inspired from videoscale element ?
Have you taken pixel aspect ratio into account ?
Do you support device that cannot scale ?

Finally, just mentioning, I had a discussion with Hans and could not conclude
if my use of the CROP ioctl was right or not. Ideally we'd be using SELECTION
but it was not implemented when I did that work. Have you made some tests with
various cropping ?

I also notice that you forgot to update the Klass field of this element. The
software videoscaler sets:

Klass                    Filter/Converter/Video/Scaler

These will eventually be used for auto-plugging elements in the future.

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