linux-kernel - Re: [PATCH v3] media: v4l2-ctrl: Add base layer priority id control.

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Date:   Wed, 2 Dec 2020 14:43:03 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Dikshita Agarwal <dikshita@...eaurora.org>,
        linux-media@...r.kernel.org, nicolas@...fresne.ca,
        stanimir.varbanov@...aro.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        vgarodia@...eaurora.org
Subject: Re: [PATCH v3] media: v4l2-ctrl: Add base layer priority id control.

On 23/11/2020 09:50, Dikshita Agarwal wrote:
> This control indicates the priority id to be applied

id -> ID

(ditto in the subject)

> to base layer.
> 
> Signed-off-by: Dikshita Agarwal <dikshita@...eaurora.org>
> ---
>  Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 9 +++++++++
>  drivers/media/v4l2-core/v4l2-ctrls.c                      | 1 +
>  include/uapi/linux/v4l2-controls.h                        | 1 +
>  3 files changed, 11 insertions(+)
> 
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index 22222ce..a518d4f 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -4467,3 +4467,12 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
>         This provides a bitmask which consists of bits [0, LTR_COUNT-1].
>         This is applicable to H264 and HEVC encoder and can be applied using
>         Request Api.
> +
> +``V4L2_CID_MPEG_VIDEO_BASELAYER_PRIORITY_ID (integer)``
> +    Specifies a priority identifier for the NAL unit, which will be applied to
> +    the base layer. By default this value is set to 0 for the base layer,
> +    and the next layer will have the priority ID assigned as 1, 2, 3 and so on.
> +    The video encoder can't decide the priority id to be applied to a layer,

id -> ID

> +    so this has to come from client.
> +    This is applicable to H264 and valid Range is from 0 to 63.
> +    Source Rec. ITU-T H.264 (06/2019); G.7.4.1.1, G.8.8.1
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index 0b81b39..799ab85 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -961,6 +961,7 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_MPEG_VIDEO_LTR_COUNT:			return "LTR Count";
>  	case V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX:		return "frame LTR index";
>  	case V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES:		return "Use LTR Frame(s)";
> +	case V4L2_CID_MPEG_VIDEO_BASELAYER_PRIORITY_ID:		return "Base Layer Priority ID";
>  	case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:		return "MPEG-2 Slice Parameters";
>  	case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:		return "MPEG-2 Quantization Matrices";
>  	case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:			return "FWHT Stateless Parameters";
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index b77fa7d..3c4fdc1 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -424,6 +424,7 @@ enum v4l2_mpeg_video_multi_slice_mode {
>  #define V4L2_CID_MPEG_VIDEO_LTR_COUNT                  (V4L2_CID_MPEG_BASE+230)
>  #define V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX            (V4L2_CID_MPEG_BASE+231)
>  #define V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES             (V4L2_CID_MPEG_BASE+232)
> +#define V4L2_CID_MPEG_VIDEO_BASELAYER_PRIORITY_ID      (V4L2_CID_MPEG_BASE + 233)
>  
>  /* CIDs for the MPEG-2 Part 2 (H.262) codec */
>  #define V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL			(V4L2_CID_MPEG_BASE+270)
> 

Regards,

	Hans