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media: docs: ext-ctrls-codec: Document cyclic intra-refresh zero control value

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In all drivers _CYCLIC_INTRA_REFRESH_MB default control value is zero
which means that the macroblocks will not be intra-refreshed. Document
this _CYCLIC_INTRA_REFRESH_MB control behaviour in control description.

Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Stanimir Varbanov 2021-06-22 13:39:56 +02:00 committed by Mauro Carvalho Chehab
parent 1ac61faf6e
commit ea9f91199c
1 changed files with 3 additions and 1 deletions
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4
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
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@ -1174,7 +1174,9 @@ enum v4l2_mpeg_video_h264_entropy_mode -
Cyclic intra macroblock refresh. This is the number of continuous
macroblocks refreshed every frame. Each frame a successive set of
macroblocks is refreshed until the cycle completes and starts from
the top of the frame. Applicable to H264, H263 and MPEG4 encoder.
the top of the frame. Setting this control to zero means that
macroblocks will not be refreshed.
Applicable to H264, H263 and MPEG4 encoder.
``V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE (boolean)``
Frame level rate control enable. If this control is disabled then