Re: [RFC 1/6] media: uapi: Add VP8 stateless encoder controls

From: Deborah Brouwer
Date: Thu Nov 30 2023 - 20:23:15 EST

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On Wed, Oct 04, 2023 at 12:37:15PM +0200, Hugues Fruchet wrote:
> From: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>
>
> Add uAPI for stateless VP8 encoders.
>
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-ctrls-core.c | 13 ++++
> drivers/media/v4l2-core/v4l2-ctrls-defs.c | 5 ++
> include/media/v4l2-ctrls.h | 2 +
> include/uapi/linux/v4l2-controls.h | 91 +++++++++++++++++++++++
> include/uapi/linux/videodev2.h | 3 +
> 5 files changed, 114 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> index a662fb60f73f..c7799ceb3d6d 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> @@ -811,6 +811,7 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> struct v4l2_ctrl_hevc_pps *p_hevc_pps;
> struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
> struct v4l2_ctrl_hevc_decode_params *p_hevc_decode_params;
> + struct v4l2_ctrl_vp8_encode_params *p_vp8_encode_params;
> struct v4l2_area *area;
> void *p = ptr.p + idx * ctrl->elem_size;
> unsigned int i;
> @@ -1047,6 +1048,15 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> zero_padding(p_vp8_frame->coder_state);
> break;
>
> + case V4L2_CTRL_TYPE_VP8_ENCODE_PARAMS:
> + p_vp8_encode_params = p;
> + if (p_vp8_encode_params->loop_filter_level > 63)
> + return -EINVAL;
> +
> + if (p_vp8_encode_params->sharpness_level > 7)
> + return -EINVAL;
> + break;
> +
> case V4L2_CTRL_TYPE_HEVC_SPS:
> p_hevc_sps = p;
>
> @@ -1868,6 +1878,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> case V4L2_CTRL_TYPE_AREA:
> elem_size = sizeof(struct v4l2_area);
> break;
> + case V4L2_CTRL_TYPE_VP8_ENCODE_PARAMS:
> + elem_size = sizeof(struct v4l2_ctrl_vp8_encode_params);
> + break;
> default:
> if (type < V4L2_CTRL_COMPOUND_TYPES)
> elem_size = sizeof(s32);
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> index 8696eb1cdd61..bd26f1d89bd5 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> @@ -1236,6 +1236,8 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_STATELESS_AV1_TILE_GROUP_ENTRY: return "AV1 Tile Group Entry";
> case V4L2_CID_STATELESS_AV1_FRAME: return "AV1 Frame Parameters";
> case V4L2_CID_STATELESS_AV1_FILM_GRAIN: return "AV1 Film Grain";
> + case V4L2_CID_STATELESS_VP8_ENCODE_PARAMS: return "VP8 Encode Parameters";
> + case V4L2_CID_STATELESS_VP8_ENCODE_QP: return "VP8 Encode QP";
>
> /* Colorimetry controls */
> /* Keep the order of the 'case's the same as in v4l2-controls.h! */
> @@ -1592,6 +1594,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> case V4L2_CID_STATELESS_AV1_FILM_GRAIN:
> *type = V4L2_CTRL_TYPE_AV1_FILM_GRAIN;
> break;
> + case V4L2_CID_STATELESS_VP8_ENCODE_PARAMS:
> + *type = V4L2_CTRL_TYPE_VP8_ENCODE_PARAMS;
> + break;
> case V4L2_CID_UNIT_CELL_SIZE:
> *type = V4L2_CTRL_TYPE_AREA;
> *flags |= V4L2_CTRL_FLAG_READ_ONLY;
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index 59679a42b3e7..a165719e1139 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -56,6 +56,7 @@ struct video_device;
> * @p_av1_tile_group_entry: Pointer to an AV1 tile group entry structure.
> * @p_av1_frame: Pointer to an AV1 frame structure.
> * @p_av1_film_grain: Pointer to an AV1 film grain structure.
> + * @p_vp8_encode_params: Pointer to a VP8 encode parameter structure.
> * @p: Pointer to a compound value.
> * @p_const: Pointer to a constant compound value.
> */
> @@ -89,6 +90,7 @@ union v4l2_ctrl_ptr {
> struct v4l2_ctrl_av1_tile_group_entry *p_av1_tile_group_entry;
> struct v4l2_ctrl_av1_frame *p_av1_frame;
> struct v4l2_ctrl_av1_film_grain *p_av1_film_grain;
> + struct v4l2_ctrl_vp8_encode_params *p_vp8_encode_params;
> void *p;
> const void *p_const;
> };
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index c3604a0a3e30..fdec5764e09c 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -3479,6 +3479,97 @@ struct v4l2_ctrl_av1_film_grain {
> __u8 reserved[4];
> };
>
> +#define V4L2_CID_STATELESS_VP8_ENCODE_PARAMS (V4L2_CID_CODEC_STATELESS_BASE + 601)
> +
> +#define V4L2_VP8_FRAME_FLAG_SHOWFRAME 0x1
> +#define V4L2_VP8_FRAME_FLAG_GOLDEN_REFRESH 0x2
> +#define V4L2_VP8_FRAME_FLAG_ALTREF_REFRESH 0x4
> +#define V4L2_VP8_FRAME_FLAG_SEGMENT_ENABLED 0x8
> +#define V4L2_VP8_FRAME_FLAG_LOOP_FILTER_ADJ_ENABLED 0x10
> +#define V4L2_VP8_FRAME_FLAG_REFRESH_ENTROPY_PROBS 0x20

Hi Andrzej,

Would you be able to add "ENCODE" to these FLAG names e.g.
something like this:

V4L2_VP8_FRAME_ENCODE_FLAG_SHOWFRAME

Just to disguish these flag names from the ones that are used in
the stateless vp8 decoder struct v4l2_ctrl_vp8_frame.

If it makes no difference otherwise, it would be helpful for someone
who might be trying to parse this future uAPI with a perl script :)

thanks,
Deborah

> +
> +#define V4L2_VP8_FRAME_TYPE_KEYFRAME 0
> +#define V4L2_VP8_FRAME_TYPE_INTER 1
> +
> +#define V4L2_VP8_FRAME_COLOR_SPACE_YUV 0
> +#define V4L2_VP8_FRAME_COLOR_SPACE_RESERVED 1
> +
> +#define V4L2_VP8_FRAME_CLAMPING_REQUIRED 0
> +#define V4L2_VP8_FRAME_CLAMPING_NO 1
> +
> +#define V4L2_VP8_FRAME_FILTER_TYPE_NORMAL 0
> +#define V4L2_VP8_FRAME_FILTER_TYPE_SIMPLE 1
> +
> +#define V4L2_VP8_FRAME_NBR_DCT_PARTITIONS_1 0
> +#define V4L2_VP8_FRAME_NBR_DCT_PARTITIONS_2 1
> +#define V4L2_VP8_FRAME_NBR_DCT_PARTITIONS_4 2
> +#define V4L2_VP8_FRAME_NBR_DCT_PARTITIONS_8 3
> +
> +#define V4L2_VP8_FRAME_GOLDEN_KEEP 0
> +#define V4L2_VP8_FRAME_GOLDEN_LASTFRAME 1
> +#define V4L2_VP8_FRAME_GOLDEN_ALTREF 2
> +
> +#define V4L2_VP8_FRAME_ALTREF_KEEP 0
> +#define V4L2_VP8_FRAME_ALTREF_LASTFRAME 1
> +#define V4L2_VP8_FRAME_ALTREF_GOLDEN 2
> +
> +#define V4L2_VP8_FRAME_REF_LAST 0
> +#define V4L2_VP8_FRAME_REF_GOLDEN 1
> +#define V4L2_VP8_FRAME_REF_ALT 2
> +
> +/**
> + * struct v4l2_ctrl_vp8_encode_params - VP8 encode parameters
> + * @flags: combination of V4L2_VP8_FRAME_FLAG_{} flags.
> + * @frame_type: specifies the frame type (key or inter).
> + * Set to one of V4L2_VP8_FRAME_TYPE_{}.
> + * @color_space: defines the YUV color space of the sequence.
> + * V4L2_VP8_FRAME_TYPE_INTER frames shall set this field to zero.
> + * Set to one of V4L2_VP8_FRAME_COLOR_SPACE_{}.
> + * @clamping_type: defines pixel value clamping type.
> + * V4L2_VP8_FRAME_TYPE_INTER frames shall set this field to zero.
> + * Set to one of V4L2_VP8_FRAME_CLAMPING_{}.
> + * @loop_filter_type: selects the type of loop filter applied.
> + * Set to one of V4L2_VP8_FRAME_FILTER_TYPE_{}.
> + * @loop_filter_level: sets the strength of the applied loop filter.
> + * Set to a value from the rage 0..63.
> + * @sharpness_level: sets the sharpness of the applied loop filter.
> + * Set to a value from the range 0..7.
> + * @log2_nbr_of_dct_partitions: determines the number of separate partitions
> + * containing the DCT coefficients of macroblocks.
> + * Set to one of V4L2_VP8_FRAME_NBR_DCT_PARTITIONS_{}.
> + * @prob_intra: indicates the probability of an intra macroblock.
> + * Set to a value from the range 0..255.
> + * @prob_last: indicates the probability that the last reference frame is used for inter-prediction.
> + * Set to a value from the range 0..255.
> + * @prob_gf: indicates the probability that the golden reference frame is used for inter-prediction.
> + * Set to a value from the range 0..255.
> + * @copy_buffer_to_golden: specifies the golden frame refresh strategy.
> + * Set to one of V4L2_VP8_FRAME_FLAG_GOLDEN_{}.
> + * @copy_buffer_to_alternate: specifies the atlref frame refresh strategy.
> + * Set to one of V4L2_VP8_FRAME_FLAG_ALTREF_{}.
> + * @reference_type: specifies what kind of reference to use for current inter frame.
> + * V4L2_VP8_FRAME_TYPE_KEYFRAME shall set this field to zero.
> + * Set to one of V4L2_VP8_FRAME_REF_{}.
> + */
> +struct v4l2_ctrl_vp8_encode_params {
> + __u32 flags;
> + __u8 frame_type;
> + __u8 color_space;
> + __u8 clamping_type;
> + __u8 loop_filter_type;
> + __u8 loop_filter_level;
> + __u8 sharpness_level;
> + __u8 log2_nbr_of_dct_partitions;
> + __u8 prob_intra;
> + __u8 prob_last;
> + __u8 prob_gf;
> + __u8 copy_buffer_to_golden;
> + __u8 copy_buffer_to_alternate;
> + __u8 reference_type;
> +};
> +
> +#define V4L2_CID_STATELESS_VP8_ENCODE_QP (V4L2_CID_CODEC_STATELESS_BASE + 602)
> +
> /* 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 78260e5d9985..b3cbdc60b82c 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -1836,6 +1836,7 @@ struct v4l2_ext_control {
> struct v4l2_ctrl_av1_tile_group_entry __user *p_av1_tile_group_entry;
> struct v4l2_ctrl_av1_frame __user *p_av1_frame;
> struct v4l2_ctrl_av1_film_grain __user *p_av1_film_grain;
> + struct v4l2_ctrl_vp8_encode_params __user *p_vp8_encode_params;
> void __user *ptr;
> };
> } __attribute__ ((packed));
> @@ -1914,6 +1915,8 @@ enum v4l2_ctrl_type {
> V4L2_CTRL_TYPE_AV1_TILE_GROUP_ENTRY = 0x281,
> V4L2_CTRL_TYPE_AV1_FRAME = 0x282,
> V4L2_CTRL_TYPE_AV1_FILM_GRAIN = 0x283,
> +
> + V4L2_CTRL_TYPE_VP8_ENCODE_PARAMS = 0x0290,
> };
>
> /* Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
> --
> 2.25.1
>

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