[Bug 785029] kmssink: Add dumb buffer support for driver pitch with multi planar formats

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785029

Guillaume Desmottes <gdesmott at gnome.org> changed:

           What    |Removed                     |Added
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 Attachment #355761|0                           |1
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--- Comment #5 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 356041
  --> https://bugzilla.gnome.org/attachment.cgi?id=356041&action=edit
kmsallocator: add driver pitch support for planar formats

We used to to handle the driver pitch only for single plan video format.
Add support for multi planes format by re-using the extrapolate function
from the v4l2 element.
Also use this pitch to calculate the proper offsets.

Prevent DRM drivers to pick a slow path if the pitches/offsets don't
match the ones it reported.

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