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media: v4l2-ctrls: Add average QP control

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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>
This commit is contained in:
Ming Qian 2024-05-06 17:49:16 +09:00 committed by Hans Verkuil
parent b785ea5b16
commit 62096c4839
3 changed files with 21 additions and 0 deletions
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14
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
View File

@ -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

5
drivers/media/v4l2-core/v4l2-ctrls-defs.c
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@ -970,6 +970,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_MPEG_VIDEO_LTR_COUNT: return "LTR Count";
case V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX: return "Frame LTR Index";
case V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES: return "Use LTR Frames";
case V4L2_CID_MPEG_VIDEO_AVERAGE_QP: return "Average QP Value";
case V4L2_CID_FWHT_I_FRAME_QP: return "FWHT I-Frame QP Value";
case V4L2_CID_FWHT_P_FRAME_QP: return "FWHT P-Frame QP Value";
@ -1507,6 +1508,10 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
*max = 0xffffffffffffLL;
*step = 1;
break;
case V4L2_CID_MPEG_VIDEO_AVERAGE_QP:
*type = V4L2_CTRL_TYPE_INTEGER;
*flags |= V4L2_CTRL_FLAG_READ_ONLY;
break;
case V4L2_CID_PIXEL_RATE:
*type = V4L2_CTRL_TYPE_INTEGER64;
*flags |= V4L2_CTRL_FLAG_READ_ONLY;

2
include/uapi/linux/v4l2-controls.h
View File

@ -898,6 +898,8 @@ enum v4l2_mpeg_video_av1_level {
V4L2_MPEG_VIDEO_AV1_LEVEL_7_3 = 23
};
#define V4L2_CID_MPEG_VIDEO_AVERAGE_QP (V4L2_CID_CODEC_BASE + 657)
/* MPEG-class control IDs specific to the CX2341x driver as defined by V4L2 */
#define V4L2_CID_CODEC_CX2341X_BASE (V4L2_CTRL_CLASS_CODEC | 0x1000)
#define V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE (V4L2_CID_CODEC_CX2341X_BASE+0)