[Bug 763006] checksumsink: Add ability to checksum video planes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763006

--- Comment #9 from Scott D Phillips <scott.d.phillips at intel.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #8)
> My thinking was more that doing a checksum of the data outside the crop area
> is useless. Maybe you have a valid use case for that ? Note, if you don't
> support CropMeta, the data will be copied before being sent to this sink.

Ah, right. So the H.265 decoded_picture_hash case is the one where I need to
disregard crop data and checksum the whole original frame.

>From what you're saying though it sounds like that shouldn't really work for
me, but it currently does with gstreamer-vaapi. If I understand correctly it
sounds like vaapidecode should be making a copy of just the cropped area if the
CropMeta isn't supported instead of its current behavior of sending the full
frame.

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