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BACKPORT: 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>
(cherry picked from commit 6bde70da98f6b5f5dbd61d2fa9c1e7efe83b0402)
Bug: 175370801
Link: https://lkml.org/lkml/2021/1/4/9
[dikshita : Original change has multiple dependencies, hence
 needs manual modifications to pick up the change in
 simplified way]
Change-Id: I59dfdbb366d966d3ce2d2b4ab009111975d7c660
Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>
This commit is contained in:
Dikshita Agarwal
2021-01-04 06:41:53 +01:00
committed by Alistair Delva
parent 5d112ffc6f
commit 252e1705cf
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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@@ -4450,3 +4450,12 @@ 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.