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media: uapi: h264: clarify expected scaling_list_4x4/8x8 order

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Clarify that the expected order of scaling lists should follow the order
they are listed in the H264 standard.

The expected scaling list order,
for 4x4: Intra Y, Intra Cb, Intra Cr, Inter Y, Inter Cb, Inter Cr,
for 8x8: Intra Y, Inter Y, Intra Cb, Inter Cb, Intra Cr, Inter Cr.

Also clarify that the values in a scaling list should be in matrix order,
the same value order that vaapi, vdpau and nvdec use.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Jonas Karlman 2019-10-29 01:00:51 +01:00 committed by Mauro Carvalho Chehab
parent 1fd50a2c29
commit 0b0393d59e
1 changed files with 6 additions and 2 deletions
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Documentation/media/uapi/v4l/ext-ctrls-codec.rst
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@ -1713,10 +1713,14 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
* - __u8
- ``scaling_list_4x4[6][16]``
-
- Scaling matrix after applying the inverse scanning process.
Expected list order is Intra Y, Intra Cb, Intra Cr, Inter Y,
Inter Cb, Inter Cr.
* - __u8
- ``scaling_list_8x8[6][64]``
-
- Scaling matrix after applying the inverse scanning process.
Expected list order is Intra Y, Inter Y, Intra Cb, Inter Cb,
Intra Cr, Inter Cr.
``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (struct)``
Specifies the slice parameters (as extracted from the bitstream)