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SubjectRe: [PATCH v2 1/3] media: v4l2-ctrls: Add average qp control
From
Hi Ming Qian,

W dniu 25.04.2024 o 08:50, Ming Qian pisze:
> Add a control V4L2_CID_MPEG_VIDEO_AVERAGE_QP to report the average qp
> value of current encoded frame. the value applies to the last dequeued
> capture buffer.
>
> Signed-off-by: Ming Qian <ming.qian@nxp.com>
> ---
> v2
> - improve document description according Hans's comments
> - drop volatile flag
>
> Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 5 +++++
> drivers/media/v4l2-core/v4l2-ctrls-defs.c | 5 +++++
> include/uapi/linux/v4l2-controls.h | 2 ++
> 3 files changed, 12 insertions(+)
>
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index 2a165ae063fb..7d82ab14b8ba 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -1653,6 +1653,11 @@ 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). Applicable to encoders.
> +

What is the intended range of the values? And why? Is your intention to make it
a hardware-agnostic control or a hardware-specific control?

Regrds,

Andrzej

> .. raw:: latex
>
> \normalsize
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> index 8696eb1cdd61..1ea52011247a 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> @@ -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;
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 99c3f5e99da7..974fd254e573 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -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)


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