Re: [PATCH v3 1/3] v4l: Add HDR10 static metadata controls

From: Hans Verkuil
Date: Tue Jan 12 2021 - 05:18:21 EST

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On 08/12/2020 15:59, Stanimir Varbanov wrote:
> Here we introduce a new Colorimetry control class and add
> Content light level and Mastering display colour volume v4l2
> compound controls, relevant payload structures and validation.
>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx>
> ---
> .../media/videodev2.h.rst.exceptions | 2 +
> drivers/media/v4l2-core/v4l2-ctrls.c | 68 +++++++++++++++++++
> include/media/v4l2-ctrls.h | 4 ++
> include/uapi/linux/v4l2-controls.h | 35 ++++++++++
> include/uapi/linux/videodev2.h | 2 +
> 5 files changed, 111 insertions(+)
>
> diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> index 0ed170c6e720..af4b8b87c5d7 100644
> --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> @@ -147,6 +147,8 @@ replace symbol V4L2_CTRL_TYPE_HEVC_PPS :c:type:`v4l2_ctrl_type`
> replace symbol V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
> replace symbol V4L2_CTRL_TYPE_AREA :c:type:`v4l2_ctrl_type`
> replace symbol V4L2_CTRL_TYPE_FWHT_PARAMS :c:type:`v4l2_ctrl_type`
> +replace symbol V4L2_CTRL_TYPE_HDR10_CLL_INFO :c:type:`v4l2_ctrl_hdr10_cll_info`
> +replace symbol V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY :c:type:`v4l2_ctrl_hdr10_mastering_display`
>
> # V4L2 capability defines
> replace define V4L2_CAP_VIDEO_CAPTURE device-capabilities
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index 5cbe0ffbf501..7bd6c3098f30 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -1015,6 +1015,9 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE: return "HEVC Decode Mode";
> case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE: return "HEVC Start Code";
>
> + case V4L2_CID_COLORIMETRY_HDR10_CLL_INFO: return "HDR10 Content Light Info";
> + case V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY: return "HDR10 Mastering Display";
> +
> /* CAMERA controls */
> /* Keep the order of the 'case's the same as in v4l2-controls.h! */
> case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
> @@ -1466,6 +1469,12 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:
> *type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
> break;
> + case V4L2_CID_COLORIMETRY_HDR10_CLL_INFO:
> + *type = V4L2_CTRL_TYPE_HDR10_CLL_INFO;
> + break;
> + case V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY:
> + *type = V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY;
> + break;
> case V4L2_CID_UNIT_CELL_SIZE:
> *type = V4L2_CTRL_TYPE_AREA;
> *flags |= V4L2_CTRL_FLAG_READ_ONLY;
> @@ -1765,6 +1774,12 @@ static void std_log(const struct v4l2_ctrl *ctrl)
> case V4L2_CTRL_TYPE_FWHT_PARAMS:
> pr_cont("FWHT_PARAMS");
> break;
> + case V4L2_CTRL_TYPE_HDR10_CLL_INFO:
> + pr_cont("HDR10_CLL_INFO");
> + break;
> + case V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY:
> + pr_cont("HDR10_MASTERING_DISPLAY");
> + break;
> default:
> pr_cont("unknown type %d", ctrl->type);
> break;

I'm missing support for the new V4L2_CID_COLORIMETRY_CLASS here.

Please split up this patch in two parts: the first adds the new class, the
second adds the new controls in that class.

Ditto for the documentation. I recommend that you do a grep for e.g.
V4L2_CID_DETECT_CLASS to see all the places where you need to add something
for this new class.

> @@ -1817,6 +1832,7 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> struct v4l2_ctrl_hevc_sps *p_hevc_sps;
> struct v4l2_ctrl_hevc_pps *p_hevc_pps;
> struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
> + struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
> struct v4l2_area *area;
> void *p = ptr.p + idx * ctrl->elem_size;
> unsigned int i;
> @@ -2112,6 +2128,52 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> zero_padding(*p_hevc_slice_params);
> break;
>
> + case V4L2_CTRL_TYPE_HDR10_CLL_INFO:
> + break;
> +
> + case V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY:
> + p_hdr10_mastering = p;
> +
> + for (i = 0; i < 3; ++i) {
> + if (p_hdr10_mastering->display_primaries_x[i] <
> + V4L2_HDR10_MASTERING_PRIMARIES_X_LOW ||
> + p_hdr10_mastering->display_primaries_x[i] >
> + V4L2_HDR10_MASTERING_PRIMARIES_X_HIGH ||
> + p_hdr10_mastering->display_primaries_y[i] <
> + V4L2_HDR10_MASTERING_PRIMARIES_Y_LOW ||
> + p_hdr10_mastering->display_primaries_y[i] >
> + V4L2_HDR10_MASTERING_PRIMARIES_Y_HIGH)
> + return -EINVAL;
> + }
> +
> + if (p_hdr10_mastering->white_point_x <
> + V4L2_HDR10_MASTERING_WHITE_POINT_X_LOW ||
> + p_hdr10_mastering->white_point_x >
> + V4L2_HDR10_MASTERING_WHITE_POINT_X_HIGH ||
> + p_hdr10_mastering->white_point_y <
> + V4L2_HDR10_MASTERING_WHITE_POINT_Y_LOW ||
> + p_hdr10_mastering->white_point_y >
> + V4L2_HDR10_MASTERING_WHITE_POINT_Y_HIGH)
> + return -EINVAL;
> +
> + if (p_hdr10_mastering->max_display_mastering_luminance <
> + V4L2_HDR10_MASTERING_MAX_LUMA_LOW ||
> + p_hdr10_mastering->max_display_mastering_luminance >
> + V4L2_HDR10_MASTERING_MAX_LUMA_HIGH ||
> + p_hdr10_mastering->min_display_mastering_luminance <
> + V4L2_HDR10_MASTERING_MIN_LUMA_LOW ||
> + p_hdr10_mastering->min_display_mastering_luminance >
> + V4L2_HDR10_MASTERING_MIN_LUMA_HIGH)
> + return -EINVAL;
> +
> + if (p_hdr10_mastering->max_display_mastering_luminance ==
> + V4L2_HDR10_MASTERING_MAX_LUMA_LOW &&
> + p_hdr10_mastering->min_display_mastering_luminance ==
> + V4L2_HDR10_MASTERING_MIN_LUMA_HIGH)
> + return -EINVAL;
> +
> + break;
> +
> case V4L2_CTRL_TYPE_AREA:
> area = p;
> if (!area->width || !area->height)
> @@ -2804,6 +2866,12 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
> elem_size = sizeof(struct v4l2_ctrl_hevc_slice_params);
> break;
> + case V4L2_CTRL_TYPE_HDR10_CLL_INFO:
> + elem_size = sizeof(struct v4l2_ctrl_hdr10_cll_info);
> + break;
> + case V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY:
> + elem_size = sizeof(struct v4l2_ctrl_hdr10_mastering_display);
> + break;
> case V4L2_CTRL_TYPE_AREA:
> elem_size = sizeof(struct v4l2_area);
> break;
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index 167ca8c8424f..8308acc89b11 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -54,6 +54,8 @@ struct video_device;
> * @p_hevc_sps: Pointer to an HEVC sequence parameter set structure.
> * @p_hevc_pps: Pointer to an HEVC picture parameter set structure.
> * @p_hevc_slice_params: Pointer to an HEVC slice parameters structure.
> + * @p_hdr10_cll: Pointer to an HDR10 Content Light Level structure.
> + * @p_hdr10_mastering : Pointer to an HDR10 Mastering Display structure.
> * @p_area: Pointer to an area.
> * @p: Pointer to a compound value.
> * @p_const: Pointer to a constant compound value.
> @@ -78,6 +80,8 @@ union v4l2_ctrl_ptr {
> struct v4l2_ctrl_hevc_sps *p_hevc_sps;
> struct v4l2_ctrl_hevc_pps *p_hevc_pps;
> struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
> + struct v4l2_ctrl_hdr10_cll_info *p_hdr10_cll;
> + struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
> struct v4l2_area *p_area;
> void *p;
> const void *p_const;
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 823b214aac0c..8563f789cbe2 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -66,6 +66,7 @@
> #define V4L2_CTRL_CLASS_RF_TUNER 0x00a20000 /* RF tuner controls */
> #define V4L2_CTRL_CLASS_DETECT 0x00a30000 /* Detection controls */
> #define V4L2_CTRL_CLASS_CODEC_STATELESS 0x00a40000 /* Stateless codecs controls */
> +#define V4L2_CTRL_CLASS_COLORIMETRY 0x00a50000 /* Colorimetry controls */
>
> /* User-class control IDs */
>
> @@ -1635,6 +1636,40 @@ struct v4l2_ctrl_fwht_params {
> __u32 quantization;
> };
>
> +#define V4L2_CID_COLORIMETRY_BASE (V4L2_CTRL_CLASS_COLORIMETRY | 0x900)
> +#define V4L2_CID_COLORIMETRY_CLASS (V4L2_CTRL_CLASS_COLORIMETRY | 1)
> +
> +#define V4L2_CID_COLORIMETRY_HDR10_CLL_INFO (V4L2_CID_COLORIMETRY_BASE + 0)
> +
> +struct v4l2_ctrl_hdr10_cll_info {
> + __u16 max_content_light_level;
> + __u16 max_pic_average_light_level;
> +};
> +
> +#define V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY (V4L2_CID_COLORIMETRY_BASE + 1)
> +
> +#define V4L2_HDR10_MASTERING_PRIMARIES_X_LOW 5
> +#define V4L2_HDR10_MASTERING_PRIMARIES_X_HIGH 37000
> +#define V4L2_HDR10_MASTERING_PRIMARIES_Y_LOW 5
> +#define V4L2_HDR10_MASTERING_PRIMARIES_Y_HIGH 42000
> +#define V4L2_HDR10_MASTERING_WHITE_POINT_X_LOW 5
> +#define V4L2_HDR10_MASTERING_WHITE_POINT_X_HIGH 37000
> +#define V4L2_HDR10_MASTERING_WHITE_POINT_Y_LOW 5
> +#define V4L2_HDR10_MASTERING_WHITE_POINT_Y_HIGH 42000
> +#define V4L2_HDR10_MASTERING_MAX_LUMA_LOW 50000
> +#define V4L2_HDR10_MASTERING_MAX_LUMA_HIGH 100000000
> +#define V4L2_HDR10_MASTERING_MIN_LUMA_LOW 1
> +#define V4L2_HDR10_MASTERING_MIN_LUMA_HIGH 50000
> +
> +struct v4l2_ctrl_hdr10_mastering_display {
> + __u16 display_primaries_x[3];
> + __u16 display_primaries_y[3];
> + __u16 white_point_x;
> + __u16 white_point_y;
> + __u32 max_display_mastering_luminance;
> + __u32 min_display_mastering_luminance;
> +};
> +
> /* MPEG-compression definitions kept for backwards compatibility */
> #ifndef __KERNEL__
> #define V4L2_CTRL_CLASS_MPEG V4L2_CTRL_CLASS_CODEC
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 79dbde3bcf8d..1bde498e36a0 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -1792,6 +1792,8 @@ enum v4l2_ctrl_type {
> V4L2_CTRL_TYPE_H264_PRED_WEIGHTS = 0x0205,
>
> V4L2_CTRL_TYPE_FWHT_PARAMS = 0x0220,
> + V4L2_CTRL_TYPE_HDR10_CLL_INFO = 0x0221,

I'd change this to 0x0110 and move it up to after V4L2_CTRL_TYPE_AREA.

> + V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY = 0x0222,
> };
>
> /* Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
>

Regards,

Hans

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