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Message-ID: <66239266-1d83-8fde-1cd2-632be8f1d0e5@xs4all.nl>
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)
>
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