media: Add parsing for APP14 data segment in jpeg helpers

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According to Rec. ITU-T T.872 (06/2012) 6.5.3
APP14 segment is for color encoding, it contains a transform flag, which
may have values of 0, 1 and 2 and are interpreted as follows:
0 - CMYK for images that are encoded with four components
  - RGB for images that are encoded with three components
1 - An image encoded with three components using YCbCr colour encoding.
2 - An image encoded with four components using YCCK colour encoding.

This is used in imx-jpeg decoder, to distinguish between
YUV444 and RGB24.

Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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Mirela Rabulea 2021-03-11 01:28:49 +01:00 • committed by Mauro Carvalho Chehab

parent b16ed1e660

commit b8035f7988

2 changed files with 61 additions and 1 deletions

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42

drivers/media/v4l2-core/v4l2-jpeg.c

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20

include/media/v4l2-jpeg.h

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