* [PATCH v2 1/2] media: uapi: HEVC: Add v4l2_ctrl_hevc_ext_sps_[ls]t_rps controls
2025-07-24 18:10 [PATCH v2 0/2] media: Add HEVC long and short term ref pic sets controls Detlev Casanova
@ 2025-07-24 18:10 ` Detlev Casanova
2025-07-24 18:10 ` [PATCH v2 2/2] media: v4l2-ctrls: Add hevc_ext_sps_[ls]t_rps controls Detlev Casanova
1 sibling, 0 replies; 3+ messages in thread
From: Detlev Casanova @ 2025-07-24 18:10 UTC (permalink / raw)
To: linux-kernel
Cc: Mauro Carvalho Chehab, Fritz Koenig, Hans Verkuil,
Sebastian Fricke, Daniel Almeida, Detlev Casanova,
Ricardo Ribalda, Hans de Goede, Yunke Cao, Sergey Senozhatsky,
Laurent Pinchart, Sakari Ailus, James Cowgill, linux-media,
kernel
Some hardware (e.g.: Rockchip's rk3588 hevc decoder) need the
long and short term reference information for HEVC decoding.
Add controls to provide it as the raw data form the stream.
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
---
.../media/v4l/ext-ctrls-codec-stateless.rst | 114 ++++++++++++++++++
.../media/v4l/vidioc-queryctrl.rst | 12 ++
2 files changed, 126 insertions(+)
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
index 0da635691fdc..bb6772cf3cee 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
@@ -2958,6 +2958,120 @@ This structure contains all loop filter related parameters. See sections
- 0x00000004
-
+``V4L2_CID_STATELESS_HEVC_EXT_SPS_LT_RPS (struct)``
+ Specifies the list of Long-Term reference sets parameters from the SPS.
+ These parameters are defined according to :ref:`hevc`.
+ They are described in section 7.4.3.2.1 "General sequence parameter set
+ RBSP semantics" of the specification.
+ This control is a dynamically sized 1-dimensional array,
+ V4L2_CTRL_FLAG_DYNAMIC_ARRAY flag must be set when using it.
+
+.. c:type:: v4l2_ctrl_hevc_ext_sps_lt_rps
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_hevc_ext_sps_lt_rps
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u16
+ - ``lt_ref_pic_poc_lsb_sps``
+ - Long term reference picture order count as described in section 7.4.3.2.1
+ "General sequence parameter set RBSP semantics" of the specification.
+ * - __u8
+ - ``flags``
+ - See :ref:`Extended Long-Term RPS Flags <hevc_ext_sps_lt_rps_flags>`
+
+.. _hevc_ext_sps_lt_rps_flags:
+
+``Extended SPS Long-Term RPS Flags``
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_HEVC_EXT_SPS_LT_RPS_FLAG_USED_LT``
+ - 0x00000001
+ - Specifies if the long-term reference picture is used 7.4.3.2.1 "General sequence parameter
+ set RBSP semantics" of the specification.
+
+``V4L2_CID_STATELESS_HEVC_EXT_SPS_ST_RPS (struct)``
+ Specifies the list of Short-Term reference sets parameters from the SPS.
+ These parameters are defined according to :ref:`hevc`.
+ They are described in section 7.4.8 "Short-term reference picture set
+ semantics" of the specification.
+ This control is a dynamically sized 1-dimensional array,
+ V4L2_CTRL_FLAG_DYNAMIC_ARRAY flag must be set when using it.
+
+.. c:type:: v4l2_ctrl_hevc_ext_sps_st_rps
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_hevc_ext_sps_st_rps
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``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.
+ * - __u8
+ - ``delta_rps_sign``
+ - Sign of the delta as specified in section 7.4.8 "Short-term reference picture set
+ semantics" of the specification.
+ * - __u16
+ - ``abs_delta_rps_minus1``
+ - Absolute delta RPS as specified in section 7.4.8 "Short-term reference picture set
+ semantics" of the specification.
+ * - __u8
+ - ``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.
+ * - __u8
+ - ``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.
+ * - __u32
+ - ``used_by_curr_pic``
+ - Bit i specifies if short-term RPS i is used by the current picture.
+ * - __u32
+ - ``use_delta_flag``
+ - Bit i specifies if short-term RPS i is included in the short-term RPS entries.
+ * - __u16
+ - ``delta_poc_s0_minus1[16]``
+ - 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.
+ * - __u16
+ - ``delta_poc_s1_minus1[16]``
+ - 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.
+ * - __u8
+ - ``flags``
+ - See :ref:`Extended Short-Term RPS Flags <hevc_ext_sps_st_rps_flags>`
+
+.. _hevc_ext_sps_st_rps_flags:
+
+``Extended SPS Short-Term RPS Flags``
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_HEVC_EXT_SPS_ST_RPS_FLAG_INTER_REF_PIC_SET_PRED``
+ - 0x00000001
+ - Specifies if the short-term RPS is predicted from another short term RPS. See details in
+ section 7.4.8 "Short-term reference picture set semantics" of the specification.
+
.. _v4l2-codec-stateless-av1:
``V4L2_CID_STATELESS_AV1_SEQUENCE (struct)``
diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
index 3549417c7feb..128c044d2e3c 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
@@ -523,6 +523,18 @@ See also the examples in :ref:`control`.
- n/a
- A struct :c:type:`v4l2_ctrl_hevc_decode_params`, containing HEVC
decoding parameters for stateless video decoders.
+ * - ``V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS``
+ - n/a
+ - n/a
+ - n/a
+ - A struct :c:type:`v4l2_ctrl_hevc_ext_sps_lt_rps`, containing HEVC
+ extended Long-Term RPS for stateless video decoders.
+ * - ``V4L2_CTRL_TYPE_HEVC_EXT_SPS_ST_RPS``
+ - n/a
+ - n/a
+ - n/a
+ - A struct :c:type:`v4l2_ctrl_hevc_ext_sps_st_rps`, containing HEVC
+ extended Short-Term RPS for stateless video decoders.
* - ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR``
- n/a
- n/a
--
2.50.1
^ permalink raw reply [flat|nested] 3+ messages in thread* [PATCH v2 2/2] media: v4l2-ctrls: Add hevc_ext_sps_[ls]t_rps controls
2025-07-24 18:10 [PATCH v2 0/2] media: Add HEVC long and short term ref pic sets controls Detlev Casanova
2025-07-24 18:10 ` [PATCH v2 1/2] media: uapi: HEVC: Add v4l2_ctrl_hevc_ext_sps_[ls]t_rps controls Detlev Casanova
@ 2025-07-24 18:10 ` Detlev Casanova
1 sibling, 0 replies; 3+ messages in thread
From: Detlev Casanova @ 2025-07-24 18:10 UTC (permalink / raw)
To: linux-kernel
Cc: Mauro Carvalho Chehab, Fritz Koenig, Hans Verkuil,
Sebastian Fricke, Daniel Almeida, Detlev Casanova,
Ricardo Ribalda, Hans de Goede, Yunke Cao, Sergey Senozhatsky,
Laurent Pinchart, Sakari Ailus, James Cowgill, linux-media,
kernel
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@collabora.com>
---
drivers/media/v4l2-core/v4l2-ctrls-core.c | 18 +++++++
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, 91 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
index 98b960775e87..142e26134ef0 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
@@ -418,6 +418,12 @@ 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;
@@ -1173,6 +1179,12 @@ 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:
+ break;
+
+ case V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS:
+ break;
+
case V4L2_CTRL_TYPE_HDR10_CLL_INFO:
break;
@@ -1925,6 +1937,12 @@ 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 1ea52011247a..e2998f4948bd 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 Extended Short Term RPS data";
+ case V4L2_CID_STATELESS_HEVC_EXT_SPS_LT_RPS: return "HEVC Extended Long Term RPS data";
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 f836512e9deb..08f869124474 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -2094,6 +2094,8 @@ 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,
@@ -2549,6 +2551,65 @@ 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;
+ __u16 abs_delta_rps_minus1;
+ __u8 num_negative_pics;
+ __u8 num_positive_pics;
+ __u32 used_by_curr_pic;
+ __u32 use_delta_flag;
+ __u16 delta_poc_s0_minus1[16];
+ __u16 delta_poc_s1_minus1[16];
+ __u8 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;
+ __u8 flags;
+};
+
#define V4L2_CID_COLORIMETRY_CLASS_BASE (V4L2_CTRL_CLASS_COLORIMETRY | 0x900)
#define V4L2_CID_COLORIMETRY_CLASS (V4L2_CTRL_CLASS_COLORIMETRY | 1)
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 3dd9fa45dde1..a3aa1f8c3894 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1981,6 +1981,8 @@ 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,
--
2.50.1
^ permalink raw reply [flat|nested] 3+ messages in thread