[Bug 751639] video: Add a "crop" GstMeta transform

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751639

Sebastian Dröge (slomo) <slomo at coaxion.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #2 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Then read the GstMeta docs ;)

GstMetaInfo has a transform_func, which is called to transform the meta on a
buffer in various situations. We have those for "copy" and "scale" at least
currently. See the implementation for "scale" in the ROI or crop meta for
example to get an idea how this stuff works.

Having the same for cropping would probably be a good idea.

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