linux-kernel - Re: [PATCH v5 2/3] media: v4l2-ctrls: Add intra-refresh period control

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Date:   Wed, 28 Jul 2021 12:12:46 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Ezequiel Garcia <ezequiel@...labora.com>,
        nicolas.dufresne@...labora.com
Subject: Re: [PATCH v5 2/3] media: v4l2-ctrls: Add intra-refresh period
 control

On 22/06/2021 13:39, Stanimir Varbanov wrote:
> Add a control to set intra-refresh period.
> 
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>

Acked-by: Hans Verkuil <hverkuil-cisco@...all.nl>

Thanks!

	Hans

> ---
>  .../userspace-api/media/v4l/ext-ctrls-codec.rst | 17 ++++++++++++++++-
>  drivers/media/v4l2-core/v4l2-ctrls-defs.c       |  2 ++
>  include/uapi/linux/v4l2-controls.h              |  1 +
>  3 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index addf44b99dfa..64c76a3a1205 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -1175,9 +1175,24 @@ enum v4l2_mpeg_video_h264_entropy_mode -
>      macroblocks refreshed every frame. Each frame a successive set of
>      macroblocks is refreshed until the cycle completes and starts from
>      the top of the frame. Setting this control to zero means that
> -    macroblocks will not be refreshed.
> +    macroblocks will not be refreshed.  Note that this control will not
> +    take effect when ``V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD`` control
> +    is set to non zero value.
>      Applicable to H264, H263 and MPEG4 encoder.
>  
> +``V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD (integer)``
> +    Intra macroblock refresh period. This sets the period to refresh
> +    the whole frame. In other words, this defines the number of frames
> +    for which the whole frame will be intra-refreshed.  An example:
> +    setting period to 1 means that the whole frame will be refreshed,
> +    setting period to 2 means that the half of macroblocks will be
> +    intra-refreshed on frameX and the other half of macroblocks
> +    will be refreshed in frameX + 1 and so on. Setting the period to
> +    zero means no period is specified.
> +    Note that if the client sets this control to non zero value the
> +    ``V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB`` control shall be
> +    ignored. Applicable to H264 and HEVC encoders.
> +
>  ``V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE (boolean)``
>      Frame level rate control enable. If this control is disabled then
>      the quantization parameter for each frame type is constant and set
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> index b6344bbf1e00..421300e13a41 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> @@ -833,6 +833,7 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:	return "Decoder Slice Interface";
>  	case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:	return "MPEG4 Loop Filter Enable";
>  	case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB:	return "Number of Intra Refresh MBs";
> +	case V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD:		return "Intra Refresh Period";
>  	case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:		return "Frame Level Rate Control Enable";
>  	case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:			return "H264 MB Level Rate Control";
>  	case V4L2_CID_MPEG_VIDEO_HEADER_MODE:			return "Sequence Header Mode";
> @@ -1258,6 +1259,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>  	case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
>  	case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
>  	case V4L2_CID_MPEG_VIDEO_DEC_DISPLAY_DELAY:
> +	case V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD:
>  		*type = V4L2_CTRL_TYPE_INTEGER;
>  		break;
>  	case V4L2_CID_MPEG_VIDEO_LTR_COUNT:
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index fdf97a6d7d18..5532b5f68493 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -435,6 +435,7 @@ enum v4l2_mpeg_video_multi_slice_mode {
>  #define V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX		(V4L2_CID_CODEC_BASE+233)
>  #define V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES		(V4L2_CID_CODEC_BASE+234)
>  #define V4L2_CID_MPEG_VIDEO_DEC_CONCEAL_COLOR		(V4L2_CID_CODEC_BASE+235)
> +#define V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD	(V4L2_CID_CODEC_BASE+236)
>  
>  /* CIDs for the MPEG-2 Part 2 (H.262) codec */
>  #define V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL			(V4L2_CID_CODEC_BASE+270)
>