media: videobuf2: Rework offset 'cookie' encoding pattern

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Change how offset 'cookie' field value is computed to make possible
to use more buffers.
The maximum number of buffers depends of PAGE_SHIFT value and can
go up to 0x7fff when PAGE_SHIFT = 12.
With this encoding pattern we know the maximum number that a queue
could store so we can check it at  queue init time.
It also make easier and faster to find buffer and plane from using
the offset field.
Change __find_plane_by_offset() prototype to return the video buffer
itself rather than it index.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

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Benjamin Gaignard 2023-11-09 17:29:14 +01:00 • committed by Mauro Carvalho Chehab

parent 07cb30216d

commit 3431e32cb5

1 changed files with 40 additions and 38 deletions

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drivers/media/common/videobuf2/videobuf2-core.c

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