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media: v4l2-ctrl: Add base layer priority id control.

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This control indicates the priority id to be applied
to base layer.

[hverkuil: renumbered V4L2_CID_MPEG_VIDEO_BASELAYER_PRIORITY_ID]

Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Dikshita Agarwal 2021-01-04 06:41:53 +01:00 • committed by Mauro Carvalho Chehab
parent 74c895974f
commit 6bde70da98
3 changed files with 11 additions and 0 deletions
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9
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
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@ -3637,3 +3637,12 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
- Selecting this value specifies that HEVC slices are expected
to be prefixed by Annex B start codes. According to :ref:`hevc`
valid start codes can be 3-bytes 0x000001 or 4-bytes 0x00000001.
``V4L2_CID_MPEG_VIDEO_BASELAYER_PRIORITY_ID (integer)``
Specifies a priority identifier for the NAL unit, which will be applied to
the base layer. By default this value is set to 0 for the base layer,
and the next layer will have the priority ID assigned as 1, 2, 3 and so on.
The video encoder can't decide the priority id to be applied to a layer,
so this has to come from client.
This is applicable to H264 and valid Range is from 0 to 63.
Source Rec. ITU-T H.264 (06/2019); G.7.4.1.1, G.8.8.1.