[Bug 727483] v4l2sink: Keep aspect ratio when device scale

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=727483
  GStreamer | gst-plugins-good | unspecified

--- Comment #4 from Aurélien Zanelli <aurelien.zanelli at parrot.com> 2014-07-31 13:54:07 UTC ---
Created an attachment (id=282139)
 View: https://bugzilla.gnome.org/attachment.cgi?id=282139
 Review: https://bugzilla.gnome.org/review?bug=727483&attachment=282139

v4l2: check if the device can scale

This patch intends to check if the device have scaling capabilities.
The main idea is to check if crop window can be different from the format.

Currently, I only test it with a device which support scaling, I will have a
device without scaling support, but I don't know why. So test with a device
with no scaler should be done.

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