[Bug 725835] v4l2sink: Use GstVideoCropMeta to set overlay window if available

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725835
  GStreamer | gst-plugins-good | git

--- Comment #3 from Aurélien Zanelli <aurelien.zanelli at parrot.com> 2014-03-07 17:39:04 UTC ---
Crop and scale part for output device is also unclear in my mind at this
moment.
The spec say cropping ioctls on an output device determine the area where
images are inserted. So i don't think we can really crop in this case using
cropping ioctls.
It seems that we can determine if a device does scaling or not with cropcaps.
However it is not really clear how, maybe we should check if cropcaps bounds
are equal to cropcaps defrect.
For now, I will try first to ensure that pixel aspect ratio remains the same

Moreover, since all this behavior with output device seems to be an abuse of
the V4L2 cropping/overlay API, it could be interesting to rely on the
experimental selection API. Drawback is device compatibilty issue.

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