linux-kernel - Re: [PATCH v7] [media] v4l: add I / P frame min max QP definitions

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Message-ID: <CAHpF3dedkOzX0o3raKWZMkVAUMsyMHw+iUtk-4wRwEZc9e3fPg@mail.gmail.com>
Date:   Fri, 29 Mar 2019 11:14:01 +0800
From:   Fish Lin <linfish@...gle.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Keiichi Watanabe <keiichiw@...omium.org>,
        Smitha T Murthy <smitha.t@...sung.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7] [media] v4l: add I / P frame min max QP definitions

Sorry, please ignore this patch, I mis-edit the patch file, will send
the correct one.

Fish

Fish Lin <linfish@...gle.com> 於 2019年3月29日 週五 上午10:59寫道：
>
> Add following V4L2 QP parameters for H.264:
> * V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP
> * V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP
> * V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP
> * V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP
>
> These controls will limit QP range for intra and inter frame,
> provide more manual control to improve video encode quality.
>
> Signed-off-by: Fish Lin <linfish@...gle.com>
> ---
> Changelog since v6:
> - Adjust ctrl id start from 385.
>
> Changelog since v5:
> - Adjust documentation wording.
>
> Changelog since v4:
> - Fix patch subject and send again.
>
> Changelog since v3:
> - Put document in ext-ctrls-codec.rst instead of extended-controls.rst
>   (which was previous version).
>
> Changelog since v2:
> - Add interaction with V4L2_CID_MPEG_VIDEO_H264_MIN/MAX_QP
>   description in the document.
>
> Changelog since v1:
> - Add description in document.
>
>  .../media/uapi/v4l/ext-ctrls-codec.rst        | 24 +++++++++++++++++++
>  drivers/media/v4l2-core/v4l2-ctrls.c          |  4 ++++
>  include/uapi/linux/v4l2-controls.h            |  6 +++++
>  3 files changed, 34 insertions(+)
>
> diff --git a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
> index c97fb7923be5..5b2db52d3b4e 100644
> --- a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
> @@ -1048,6 +1048,30 @@ enum v4l2_mpeg_video_h264_entropy_mode -
>      Quantization parameter for an B frame for H264. Valid range: from 0
>      to 51.
>
> +``V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP (integer)``
> +    Minimum quantization parameter for the H264 I frame to limit I 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_I_FRAME_MAX_QP (integer)``
> +    Maximum quantization parameter for the H264 I frame to limit I 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_H264_P_FRAME_MIN_QP (integer)``
> +    Minimum quantization parameter for the H264 P frame to limit P 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_P_FRAME_MAX_QP (integer)``
> +    Maximum quantization parameter for the H264 P frame to limit P 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.
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index b79d3bbd8350..115fb8debe23 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -828,6 +828,10 @@ const char *v4l2_ctrl_get_name(u32 id)
>         case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
>                                                                 return "H264 Constrained Intra Pred";
>         case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET:   return "H264 Chroma QP Index Offset";
> +       case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP:           return "H264 I-Frame Minimum QP Value";
> +       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_MPEG4_I_FRAME_QP:              return "MPEG4 I-Frame QP Value";
>         case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP:              return "MPEG4 P-Frame QP Value";
>         case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP:              return "MPEG4 B-Frame QP Value";
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 06479f2fb3ae..4421baa84177 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -535,6 +535,12 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type {
>  #define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP  (V4L2_CID_MPEG_BASE+382)
>  #define V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION  (V4L2_CID_MPEG_BASE+383)
>  #define V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET                (V4L2_CID_MPEG_BASE+384)
> +#define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP        (V4L2_CID_MPEG_BASE+385)
> +#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_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)
> --
> 2.21.0.225.g810b269d1ac-goog
>