Re: [PATCH v8 02/17] media: v4l2-ctrls: Add hevc_ext_sps_[ls]t_rps controls

From: Nicolas Dufresne

Date: Sun Jan 18 2026 - 16:52:39 EST

Le vendredi 09 janvier 2026 à 11:15 -0500, Detlev Casanova a écrit :
> The vdpu381 decoder found on newer Rockchip SoC need the information
> from the long term and short term ref pic sets from the SPS.
>
> So far, it wasn't included in the v4l2 API, so add it with new dynamic
> sized controls.
>
> Each element of the hevc_ext_sps_lt_rps array contains the long term ref
> pic set at that index.
> Each element of the hevc_ext_sps_st_rps contains the short term ref pic
> set at that index, as the raw data.
> It is the role of the drivers to calculate the reference sets values.
>
> Signed-off-by: Detlev Casanova <detlev.casanova@xxxxxxxxxxxxx>

Reviewed-by: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>

> ---
> drivers/media/v4l2-core/v4l2-ctrls-core.c | 28 +++++++++++
> drivers/media/v4l2-core/v4l2-ctrls-defs.c | 10 ++++
> include/uapi/linux/v4l2-controls.h        | 61 +++++++++++++++++++++++
> include/uapi/linux/videodev2.h            | 2 +
> 4 files changed, 101 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> index 209bc05883bb..f11255255c74 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> @@ -424,6 +424,12 @@ void v4l2_ctrl_type_op_log(const struct v4l2_ctrl *ctrl)
> case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
> pr_cont("HEVC_SLICE_PARAMS");
> break;
> + case V4L2_CTRL_TYPE_HEVC_EXT_SPS_ST_RPS:
> + pr_cont("HEVC_EXT_SPS_ST_RPS");
> + break;
> + case V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS:
> + pr_cont("HEVC_EXT_SPS_LT_RPS");
> + break;
> case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
> pr_cont("HEVC_SCALING_MATRIX");
> break;
> @@ -961,6 +967,8 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> struct v4l2_ctrl_h264_pred_weights *p_h264_pred_weights;
> struct v4l2_ctrl_h264_slice_params *p_h264_slice_params;
> struct v4l2_ctrl_h264_decode_params *p_h264_dec_params;
> + struct v4l2_ctrl_hevc_ext_sps_lt_rps *p_hevc_lt_rps;
> + struct v4l2_ctrl_hevc_ext_sps_st_rps *p_hevc_st_rps;
> struct v4l2_ctrl_hevc_sps *p_hevc_sps;
> struct v4l2_ctrl_hevc_pps *p_hevc_pps;
> struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
> @@ -1254,6 +1262,20 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
> break;
>
> + case V4L2_CTRL_TYPE_HEVC_EXT_SPS_ST_RPS:
> + p_hevc_st_rps = p;
> +
> + if (p_hevc_st_rps->flags & ~V4L2_HEVC_EXT_SPS_ST_RPS_FLAG_INTER_REF_PIC_SET_PRED)
> + return -EINVAL;
> + break;
> +
> + case V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS:
> + p_hevc_lt_rps = p;
> +
> + if (p_hevc_lt_rps->flags & ~V4L2_HEVC_EXT_SPS_LT_RPS_FLAG_USED_LT)
> + return -EINVAL;
> + break;
> +
> case V4L2_CTRL_TYPE_HDR10_CLL_INFO:
> break;
>
> @@ -2006,6 +2028,12 @@ 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_HEVC_EXT_SPS_ST_RPS:
> + elem_size = sizeof(struct v4l2_ctrl_hevc_ext_sps_st_rps);
> + break;
> + case V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS:
> + elem_size = sizeof(struct v4l2_ctrl_hevc_ext_sps_lt_rps);
> + break;
> case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
> elem_size = sizeof(struct v4l2_ctrl_hevc_scaling_matrix);
> break;
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> index ad41f65374e2..167286c9e424 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> @@ -1233,6 +1233,8 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_STATELESS_HEVC_DECODE_MODE: return "HEVC Decode Mode";
> case V4L2_CID_STATELESS_HEVC_START_CODE: return "HEVC Start Code";
> case V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS: return "HEVC Entry Point Offsets";
> + case V4L2_CID_STATELESS_HEVC_EXT_SPS_ST_RPS: return "HEVC Short Term Ref Sets";
> + case V4L2_CID_STATELESS_HEVC_EXT_SPS_LT_RPS: return "HEVC Long Term Ref Sets";
> case V4L2_CID_STATELESS_AV1_SEQUENCE: return "AV1 Sequence Parameters";
> case V4L2_CID_STATELESS_AV1_TILE_GROUP_ENTRY: return "AV1 Tile Group Entry";
> case V4L2_CID_STATELESS_AV1_FRAME: return "AV1 Frame Parameters";
> @@ -1578,6 +1580,14 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> *type = V4L2_CTRL_TYPE_U32;
> *flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY;
> break;
> + case V4L2_CID_STATELESS_HEVC_EXT_SPS_ST_RPS:
> + *type = V4L2_CTRL_TYPE_HEVC_EXT_SPS_ST_RPS;
> + *flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY;
> + break;
> + case V4L2_CID_STATELESS_HEVC_EXT_SPS_LT_RPS:
> + *type = V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS;
> + *flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY;
> + break;
> case V4L2_CID_STATELESS_VP9_COMPRESSED_HDR:
> *type = V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR;
> break;
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index f84ed133a6c9..e9f1fcc4f840 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -2099,6 +2099,8 @@ struct v4l2_ctrl_mpeg2_quantisation {
> #define V4L2_CID_STATELESS_HEVC_DECODE_MODE (V4L2_CID_CODEC_STATELESS_BASE + 405)
> #define V4L2_CID_STATELESS_HEVC_START_CODE (V4L2_CID_CODEC_STATELESS_BASE + 406)
> #define V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS (V4L2_CID_CODEC_STATELESS_BASE + 407)
> +#define V4L2_CID_STATELESS_HEVC_EXT_SPS_ST_RPS (V4L2_CID_CODEC_STATELESS_BASE + 408)
> +#define V4L2_CID_STATELESS_HEVC_EXT_SPS_LT_RPS (V4L2_CID_CODEC_STATELESS_BASE + 409)
>
> enum v4l2_stateless_hevc_decode_mode {
> V4L2_STATELESS_HEVC_DECODE_MODE_SLICE_BASED,
> @@ -2554,6 +2556,65 @@ struct v4l2_ctrl_hevc_scaling_matrix {
> __u8 scaling_list_dc_coef_32x32[2];
> };
>
> +#define V4L2_HEVC_EXT_SPS_ST_RPS_FLAG_INTER_REF_PIC_SET_PRED 0x1
> +
> +/*
> + * struct v4l2_ctrl_hevc_ext_sps_st_rps - HEVC short term RPS parameters
> + *
> + * Dynamic size 1-dimension array for short term RPS. The number of elements
> + * is v4l2_ctrl_hevc_sps::num_short_term_ref_pic_sets. It can contain up to 65 elements.
> + *
> + * @delta_idx_minus1: Specifies the delta compare to the index. See details in section 7.4.8
> + *                    "Short-term reference picture set semantics" of the specification.
> + * @delta_rps_sign: Sign of the delta as specified in section 7.4.8 "Short-term reference picture
> + *                  set semantics" of the specification.
> + * @abs_delta_rps_minus1: Absolute delta RPS as specified in section 7.4.8 "Short-term reference
> + *                        picture set semantics" of the specification.
> + * @num_negative_pics: Number of short-term RPS entries that have picture order count values less
> + *                     than the picture order count value of the current picture.
> + * @num_positive_pics: Number of short-term RPS entries that have picture order count values
> + *                     greater than the picture order count value of the current picture.
> + * @used_by_curr_pic: Bit j specifies if short-term RPS j is used by the current picture.
> + * @use_delta_flag: Bit j equals to 1 specifies that the j-th entry in the source candidate
> + *                  short-term RPS is included in this candidate short-term RPS.
> + * @delta_poc_s0_minus1: Specifies the negative picture order count delta for the i-th entry in
> + *                       the short-term RPS. See details in section 7.4.8 "Short-term reference
> + *                       picture set semantics" of the specification.
> + * @delta_poc_s1_minus1: Specifies the positive picture order count delta for the i-th entry in
> + *                       the short-term RPS. See details in section 7.4.8 "Short-term reference
> + *                       picture set semantics" of the specification.
> + * @flags: See V4L2_HEVC_EXT_SPS_ST_RPS_FLAG_{}
> + */
> +struct v4l2_ctrl_hevc_ext_sps_st_rps {
> + __u8 delta_idx_minus1;
> + __u8 delta_rps_sign;
> + __u8 num_negative_pics;
> + __u8 num_positive_pics;
> + __u32 used_by_curr_pic;
> + __u32 use_delta_flag;
> + __u16 abs_delta_rps_minus1;
> + __u16 delta_poc_s0_minus1[16];
> + __u16 delta_poc_s1_minus1[16];
> + __u16 flags;
> +};
> +
> +#define V4L2_HEVC_EXT_SPS_LT_RPS_FLAG_USED_LT 0x1
> +
> +/*
> + * struct v4l2_ctrl_hevc_ext_sps_lt_rps - HEVC long term RPS parameters
> + *
> + * Dynamic size 1-dimension array for long term RPS. The number of elements
> + * is v4l2_ctrl_hevc_sps::num_long_term_ref_pics_sps. It can contain up to 65 elements.
> + *
> + * @lt_ref_pic_poc_lsb_sps: picture order count modulo MaxPicOrderCntLsb of the i-th candidate
> + *                          long-term reference picture.
> + * @flags: See V4L2_HEVC_EXT_SPS_LT_RPS_FLAG_{}
> + */
> +struct v4l2_ctrl_hevc_ext_sps_lt_rps {
> + __u16 lt_ref_pic_poc_lsb_sps;
> + __u16 flags;
> +};
> +
> /* Stateless VP9 controls */
>
> #define V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED 0x1
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index add08188f068..5efaeb74ef92 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -1985,6 +1985,8 @@ enum v4l2_ctrl_type {
> V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS = 0x0272,
> V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX = 0x0273,
> V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS = 0x0274,
> + V4L2_CTRL_TYPE_HEVC_EXT_SPS_ST_RPS = 0x0275,
> + V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS = 0x0276,
>
> V4L2_CTRL_TYPE_AV1_SEQUENCE     = 0x280,
> V4L2_CTRL_TYPE_AV1_TILE_GROUP_ENTRY = 0x281,

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