linux-kernel - Re: [PATCH v3] [media] v4l: add I / P frame min max QP definitions

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Date:   Fri, 8 Feb 2019 10:58:26 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Fish Lin <linfish@...gle.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Keiichi Watanabe <keiichiw@...omium.org>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Will Deacon <will.deacon@....com>,
        Smitha T Murthy <smitha.t@...sung.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Tomasz Figa <tfiga@...omium.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, trivial@...nel.org
Subject: Re: [PATCH v3] [media] v4l: add I / P frame min max QP definitions

On 1/30/19 10:11 AM, Fish Lin wrote:
> 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 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/extended-controls.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/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
> index 286a2dd7ec36..402e41eb24ee 100644
> --- a/Documentation/media/uapi/v4l/extended-controls.rst
> +++ b/Documentation/media/uapi/v4l/extended-controls.rst
> @@ -1214,6 +1214,30 @@ 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 H264 I frame, to limit I frame
> +    quality in a range. Valid range: from 0 to 51. If
> +    V4L2_CID_MPEG_VIDEO_H264_MIN_QP is set, the quantization parameter

is set -> is also set

> +    should be chosen to meet both of the requirement.

both of the requirement -> both requirements

Ditto for the other three controls below.

However, you might want to wait a little bit since I have this patch pending:

https://patchwork.linuxtv.org/patch/54388/

which will require a rebase of your patch anyway.

Regards,

	Hans

> +
> +``V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP (integer)``
> +    Maximum quantization parameter for H264 I frame, to limit I frame
> +    quality in a range. Valid range: from 0 to 51. If
> +    V4L2_CID_MPEG_VIDEO_H264_MAX_QP is set, the quantization parameter
> +    should be chosen to meet both of the requirement.
> +
> +``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP (integer)``
> +    Minimum quantization parameter for H264 P frame, to limit P frame
> +    quality in a range. Valid range: from 0 to 51. If
> +    V4L2_CID_MPEG_VIDEO_H264_MIN_QP is set, the quantization parameter
> +    should be chosen to meet both of the requirement.
> +
> +``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (integer)``
> +    Maximum quantization parameter for H264 P frame, to limit P frame
> +    quality in a range. Valid range: from 0 to 51. If
> +    V4L2_CID_MPEG_VIDEO_H264_MAX_QP is set, the quantization parameter
> +    should be chosen to meet both of the requirement.
> +
>  ``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 5e3806feb5d7..e2b0af0d2283 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -825,6 +825,10 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
>  	case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
>  								return "H264 Set QP Value for HC Layers";
> +	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 3dcfc6148f99..9519673e6437 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -533,6 +533,12 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type {
>  };
>  #define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER	(V4L2_CID_MPEG_BASE+381)
>  #define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP	(V4L2_CID_MPEG_BASE+382)
> +
> +#define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP	(V4L2_CID_MPEG_BASE+390)
> +#define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP	(V4L2_CID_MPEG_BASE+391)
> +#define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP	(V4L2_CID_MPEG_BASE+392)
> +#define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP	(V4L2_CID_MPEG_BASE+393)
> +
>  #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)
>