On Fri Jan 9 11:15:17 2026 -0500, Detlev Casanova wrote:
> Some hardware (e.g.: Rockchip's rk3588 hevc decoder) need to fully parse
> the slice header, which cannot be passed with the current controls.
> There is also no skip method similar as to what can be found in
> verisilicon HW.
>
> The SPS is therefore extended through these 2 new controls, providing the
> long and short term reference information from the slice header for HEVC
> decoding.
>
> These now controls are similar as what is passed in the Vulkan Video API
> with the StdVideoH265ShortTermRefPicSet and StdVideoH265LongTermRefPicsSps
> structures embedded in the SPS struct.
>
> Reviewed-by: Nicolas Dufresne <[email protected]>
> Signed-off-by: Detlev Casanova <[email protected]>
> Signed-off-by: Nicolas Dufresne <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
.../media/v4l/ext-ctrls-codec-stateless.rst | 120 +++++++++++++++++++++
.../media/v4l/videodev2.h.rst.exceptions | 2 +
.../userspace-api/media/v4l/vidioc-queryctrl.rst | 12 +++
3 files changed, 134 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 497ae74379f6..3b1e05c6eb13 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
@@ -2959,6 +2959,126 @@ This structure contains all loop filter related
parameters. See sections
- 0x00000004
-
+``V4L2_CID_STATELESS_HEVC_EXT_SPS_LT_RPS (struct)``
+ Subset of the :c:type:`v4l2_ctrl_hevc_sps` control.
+ It extends it with the list of Long-term reference sets parameters.
+ 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.
+ The values in the array should be ignored when either
+ num_long_term_ref_pics_sps is 0 or the
+ V4L2_HEVC_SPS_FLAG_LONG_TERM_REF_PICS_PRESENT flag is not set in
+ :c:type:`v4l2_ctrl_hevc_sps`.
+
+.. 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.
+ * - __u16
+ - ``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)``
+ Subset of the :c:type:`v4l2_ctrl_hevc_sps` control.
+ It extends it with the list of Short-term reference sets parameters.
+ 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.
+ The values in the array should be ignored when
+ num_short_term_ref_pic_sets is 0.
+
+.. 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.
+ * - __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
+ - ``abs_delta_rps_minus1``
+ - Absolute delta RPS as specified in section 7.4.8 "Short-term reference
picture set
+ semantics" of the specification.
+ * - __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.
+ * - __u16
+ - ``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/videodev2.h.rst.exceptions
b/Documentation/userspace-api/media/v4l/videodev2.h.rst.exceptions
index c41693115db6..6182b4e2d2ee 100644
--- a/Documentation/userspace-api/media/v4l/videodev2.h.rst.exceptions
+++ b/Documentation/userspace-api/media/v4l/videodev2.h.rst.exceptions
@@ -150,6 +150,8 @@ replace symbol V4L2_CTRL_TYPE_H264_SCALING_MATRIX
:c:type:`V4L.v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_H264_PRED_WEIGHTS :c:type:`V4L.v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_H264_SLICE_PARAMS :c:type:`V4L.v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_H264_DECODE_PARAMS :c:type:`V4L.v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_HEVC_EXT_SPS_ST_RPS :c:type:`V4L.v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS :c:type:`V4L.v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_HEVC_SPS :c:type:`V4L.v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_HEVC_PPS :c:type:`V4L.v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS :c:type:`V4L.v4l2_ctrl_type`
diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
index c8baa9430c14..82c8b52e771c 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
@@ -531,6 +531,18 @@ 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
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