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Date: Wed, 2 Dec 2020 12:12:07 +0100
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 <nicolas.dufresne@...labora.com>
Subject: Re: [PATCH v2 1/3] v4l: Add HDR10 static metadata controls
On 24/11/2020 00:02, Stanimir Varbanov wrote:
> Add Content light level and Mastering display colour volume v4l2
> compounf controls, relevant payload structures and validation.
compounf -> compound
>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
> drivers/media/v4l2-core/v4l2-ctrls.c | 62 ++++++++++++++++++++++++++++
> include/media/hdr10-ctrls.h | 55 ++++++++++++++++++++++++
> include/media/v4l2-ctrls.h | 3 ++
> 3 files changed, 120 insertions(+)
> create mode 100644 include/media/hdr10-ctrls.h
>
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index ad47d00e28d6..028630576401 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -1024,6 +1024,9 @@ 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_MPEG_VIDEO_HDR10_CLL_INFO: return "HDR10 Content Light Info";
> + case V4L2_CID_MPEG_VIDEO_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";
> @@ -1461,6 +1464,12 @@ 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_MPEG_VIDEO_HDR10_CLL_INFO:
> + *type = V4L2_CTRL_TYPE_HDR10_CLL_INFO;
> + break;
> + case V4L2_CID_MPEG_VIDEO_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;
> @@ -1775,6 +1784,7 @@ 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;
> @@ -1934,6 +1944,52 @@ 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_luminance <
> + V4L2_HDR10_MASTERING_MAX_LUMA_LOW ||
> + p_hdr10_mastering->max_luminance >
> + V4L2_HDR10_MASTERING_MAX_LUMA_HIGH ||
> + p_hdr10_mastering->min_luminance <
> + V4L2_HDR10_MASTERING_MIN_LUMA_LOW ||
> + p_hdr10_mastering->min_luminance >
> + V4L2_HDR10_MASTERING_MIN_LUMA_HIGH)
> + return -EINVAL;
> +
> + if (p_hdr10_mastering->max_luminance ==
> + V4L2_HDR10_MASTERING_MAX_LUMA_LOW &&
> + p_hdr10_mastering->min_luminance ==
> + V4L2_HDR10_MASTERING_MIN_LUMA_HIGH)
> + return -EINVAL;
> +
> + break;
> +
> case V4L2_CTRL_TYPE_AREA:
> area = p;
> if (!area->width || !area->height)
> @@ -2626,6 +2682,12 @@ 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/hdr10-ctrls.h b/include/media/hdr10-ctrls.h
> new file mode 100644
> index 000000000000..f6f77edc0b60
> --- /dev/null
> +++ b/include/media/hdr10-ctrls.h
> @@ -0,0 +1,55 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * These are the HEVC state controls for use with stateless HEVC
> + * codec drivers.
> + *
> + * It turns out that these structs are not stable yet and will undergo
> + * more changes. So keep them private until they are stable and ready to
> + * become part of the official public API.
> + */
> +
> +#ifndef _HDR10_CTRLS_H_
> +#define _HDR10_CTRLS_H_
> +
> +/*
> + * Content light level information.
> + * Source Rec. ITU-T H.265 v7 (11/2019) HEVC; D.2.35
> + */
> +#define V4L2_CID_MPEG_VIDEO_HDR10_CLL_INFO (V4L2_CID_MPEG_BASE + 1017)
> +#define V4L2_CTRL_TYPE_HDR10_CLL_INFO 0x0123
> +
> +struct v4l2_ctrl_hdr10_cll_info {
> + __u16 max_content_light_level;
> + __u16 max_pic_average_light_level;
> +};
> +
> +/*
> + * Mastering display colour volume.
> + * Source Rec. ITU-T H.265 v7 (11/2019) HEVC; D.2.28
> + */
> +#define V4L2_CID_MPEG_VIDEO_HDR10_MASTERING_DISPLAY (V4L2_CID_MPEG_BASE + 1018)
I don't think this should be part of the codec control class. It is also needed
for HDMI receivers, for example.
I think it is better to create a new "Colorimetry" control class for controls like
this.
But I advise that you wait until this PR is merged:
https://patchwork.linuxtv.org/project/linux-media/patch/d68da172-b251-000f-653d-38a8a4c7b715@xs4all.nl/
Note that you also need to add validation support for this to std_validate_compound()
and possibly add initialization to std_init_compound() is v4l2-ctrls.c.
Regards,
Hans
> +#define V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY 0x0124
> +
> +#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_luminance;
> + __u32 min_luminance;
> +};
> +
> +#endif
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index 4fbace0fc7e5..81bd026fc1ea 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -19,6 +19,7 @@
> */
> #include <media/mpeg2-ctrls.h>
> #include <media/fwht-ctrls.h>
> +#include <media/hdr10-ctrls.h>
> #include <media/h264-ctrls.h>
> #include <media/vp8-ctrls.h>
> #include <media/hevc-ctrls.h>
> @@ -80,6 +81,8 @@ 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;
>
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