Re: [PATCH v2 1/2] media: v4l2-ctrl: Add frame-specific min/max qp controls for hevc

From: Hans Verkuil
Date: Wed Nov 11 2020 - 07:00:45 EST

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On 21/09/2020 15:03, Dikshita Agarwal wrote:
> - Adds min/max qp controls for B frame for h264.
> - Adds min/max qp controls for I/P/B frames for hevc similar to h264.
> - Update valid range of mim/max qp for hevc to accommodate 10 bit.
>
> Signed-off-by: Dikshita Agarwal <dikshita@xxxxxxxxxxxxxx>
> ---
> .../userspace-api/media/v4l/ext-ctrls-codec.rst | 54 +++++++++++++++++++++-
> drivers/media/v4l2-core/v4l2-ctrls.c | 8 ++++
> include/uapi/linux/v4l2-controls.h | 9 ++++
> 3 files changed, 69 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index ce728c75..26f8220 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -1182,6 +1182,18 @@ enum v4l2_mpeg_video_h264_entropy_mode -
> V4L2_CID_MPEG_VIDEO_H264_MAX_QP is also set, the quantization parameter
> should be chosen to meet both requirements.
>
> +``V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MIN_QP (integer)``
> + Minimum quantization parameter for the H264 B frame to limit B frame
> + quality to a range. Valid range: from 0 to 51. If
> + V4L2_CID_MPEG_VIDEO_H264_MIN_QP is also set, the quantization parameter
> + should be chosen to meet both requirements.
> +
> +``V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MAX_QP (integer)``
> + Maximum quantization parameter for the H264 B frame to limit B frame
> + quality to a range. Valid range: from 0 to 51. If
> + V4L2_CID_MPEG_VIDEO_H264_MAX_QP is also set, the quantization parameter
> + should be chosen to meet both requirements.
> +
> ``V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP (integer)``
> Quantization parameter for an I frame for MPEG4. Valid range: from 1
> to 31.
> @@ -3441,11 +3453,13 @@ HEVC/H.265 Control IDs
>
> ``V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP (integer)``
> Minimum quantization parameter for HEVC.
> - Valid range: from 0 to 51.
> + Valid range: from 0 - 51 for 8 bit and
> + 0 - 63 for 10 bit.

This can be on one line.

>
> ``V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP (integer)``
> Maximum quantization parameter for HEVC.
> - Valid range: from 0 to 51.
> + Valid range: from 0 - 51 for 8 bit and
> + 0 - 63 for 10 bit

Same here, but this is also missing a period at the end.

>
> ``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP (integer)``
> Quantization parameter for an I frame for HEVC.
> @@ -3462,6 +3476,42 @@ HEVC/H.265 Control IDs
> Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
> V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
>
> +``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MIN_QP (integer)``
> + Minimum quantization parameter for the HEVC I frame to limit I frame
> + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit.
> + If V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP is also set, the quantization parameter
> + should be chosen to meet both requirements.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MAX_QP (integer)``
> + Maximum quantization parameter for the HEVC I frame to limit I frame
> + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit.
> + If V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP is also set, the quantization parameter
> + should be chosen to meet both requirements.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MIN_QP (integer)``
> + Minimum quantization parameter for the HEVC P frame to limit P frame
> + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit.
> + If V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP is also set, the quantization parameter
> + should be chosen to meet both requirements.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MAX_QP (integer)``
> + Maximum quantization parameter for the HEVC P frame to limit P frame
> + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit.
> + If V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP is also set, the quantization parameter
> + should be chosen to meet both requirements.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MIN_QP (integer)``
> + Minimum quantization parameter for the HEVC B frame to limit B frame
> + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit.
> + If V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP is also set, the quantization parameter
> + should be chosen to meet both requirements.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MAX_QP (integer)``
> + Maximum quantization parameter for the HEVC B frame to limit B frame
> + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit.
> + If V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP is also set, the quantization parameter
> + should be chosen to meet both requirements.
> +
> ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP (boolean)``
> HIERARCHICAL_QP allows the host to specify the quantization parameter
> values for each temporal layer through HIERARCHICAL_QP_LAYER. This is
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index bd7f330..abef73e 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -920,6 +920,8 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP: return "H264 I-Frame Maximum QP Value";
> case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP: return "H264 P-Frame Minimum QP Value";
> case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP: return "H264 P-Frame Maximum QP Value";
> + case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MIN_QP: return "H264 B-Frame Minimum QP Value";
> + case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MAX_QP: return "H264 B-Frame Maximum QP Value";
> case V4L2_CID_MPEG_VIDEO_H264_SPS: return "H264 Sequence Parameter Set";
> case V4L2_CID_MPEG_VIDEO_H264_PPS: return "H264 Picture Parameter Set";
> case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX: return "H264 Scaling Matrix";
> @@ -978,6 +980,12 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value";
> case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value";
> case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value";
> + case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MIN_QP: return "HEVC I-Frame Minimum QP Value";
> + case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MAX_QP: return "HEVC I-Frame Maximum QP Value";
> + case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MIN_QP: return "HEVC P-Frame Minimum QP Value";
> + case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MAX_QP: return "HEVC P-Frame Maximum QP Value";
> + case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MIN_QP: return "HEVC B-Frame Minimum QP Value";
> + case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MAX_QP: return "HEVC B-Frame Maximum QP Value";
> case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile";
> case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level";
> case V4L2_CID_MPEG_VIDEO_HEVC_TIER: return "HEVC Tier";
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index a184c49..7ba05fe 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -578,6 +578,8 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type {
> #define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+386)
> #define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+387)
> #define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+388)
> +#define V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+389)
> +#define V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+390)
> #define V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP (V4L2_CID_MPEG_BASE+400)
> #define V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP (V4L2_CID_MPEG_BASE+401)
> #define V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP (V4L2_CID_MPEG_BASE+402)
> @@ -762,6 +764,13 @@ enum v4l2_cid_mpeg_video_hevc_size_of_length_field {
> #define V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR (V4L2_CID_MPEG_BASE + 644)
> #define V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY (V4L2_CID_MPEG_BASE + 645)
> #define V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE (V4L2_CID_MPEG_BASE + 646)
> +#define V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+647)
> +#define V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+648)
> +#define V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+649)
> +#define V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+650)
> +#define V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+651)
> +#define V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+652)
> +
> enum v4l2_mpeg_video_frame_skip_mode {
> V4L2_MPEG_VIDEO_FRAME_SKIP_MODE_DISABLED = 0,
> V4L2_MPEG_VIDEO_FRAME_SKIP_MODE_LEVEL_LIMIT = 1,
>

Regards,

Hans

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