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| author | Ming Qian <ming.qian@nxp.com> | 2024-05-06 10:49:16 +0200 |
|---|---|---|
| committer | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2024-06-10 10:24:30 +0200 |
| commit | 62096c48394b49e326056a62780fb67b60edde91 (patch) | |
| tree | 038828de4ad3d1b09fa5fbe6ccde4fd1af87cbf3 /Documentation/userspace-api | |
| parent | media: mediatek: vcodec: Alloc DMA memory with DMA_ATTR_ALLOC_SINGLE_PAGES (diff) | |
| download | linux-62096c48394b49e326056a62780fb67b60edde91.tar.xz linux-62096c48394b49e326056a62780fb67b60edde91.zip | |
media: v4l2-ctrls: Add average QP control
Add a control V4L2_CID_MPEG_VIDEO_AVERAGE_QP to report the average QP
value of the current encoded frame. The value applies to the last
dequeued capture buffer.
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst index 2a165ae063fb..4a379bd9e3fb 100644 --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst @@ -1653,6 +1653,20 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - Quantization parameter for a P frame for FWHT. Valid range: from 1 to 31. +``V4L2_CID_MPEG_VIDEO_AVERAGE_QP (integer)`` + This read-only control returns the average QP value of the currently + encoded frame. The value applies to the last dequeued capture buffer + (VIDIOC_DQBUF). Its valid range depends on the encoding format and parameters. + For H264, its valid range is from 0 to 51. + For HEVC, its valid range is from 0 to 51 for 8 bit and + from 0 to 63 for 10 bit. + For H263 and MPEG4, its valid range is from 1 to 31. + For VP8, its valid range is from 0 to 127. + For VP9, its valid range is from 0 to 255. + If the codec's MIN_QP and MAX_QP are set, then the QP will meet both requirements. + Codecs need to always use the specified range, rather then a HW custom range. + Applicable to encoders + .. raw:: latex \normalsize |