[PATCH v8 08/17] media: uapi: HEVC: Add documentation to uAPI structure

Benjamin Gaignard
2022-06-14T08:42:40Z

Add kernel-doc documentation for all the HEVC structures.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
version 5:
- Fix num_short_term_ref_pic_sets and num_long_term_ref_pics_sps

.../media/v4l/ext-ctrls-codec.rst | 164 +++++++------
include/media/hevc-ctrls.h | 221 +++++++++++++++++-
2 files changed, 311 insertions(+), 74 deletions(-)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 1ccf6dda61b3..06b967de140c 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -2695,70 +2695,76 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
of H.265 specifications.
* - __u16
- ``pic_width_in_luma_samples``
- -
+ - Specifies the width of each decoded picture in units of luma samples.
* - __u16
- ``pic_height_in_luma_samples``
- -
+ - Specifies the height of each decoded picture in units of luma samples.
* - __u8
- ``bit_depth_luma_minus8``
- -
+ - Specifies the bit depth of the samples of the luma array.
* - __u8
- ``bit_depth_chroma_minus8``
- -
+ - Specifies the bit depth of the samples of the chroma arrays.
* - __u8
- ``log2_max_pic_order_cnt_lsb_minus4``
- -
+ - Specifies the value of the variable MaxPicOrderCntLsb.
* - __u8
- ``sps_max_dec_pic_buffering_minus1``
- -
+ - Plus 1 specifies the maximum required size of the decoded picture buffer for
+ the CVS
* - __u8
- ``sps_max_num_reorder_pics``
- -
+ - Indicates the maximum allowed number of pictures.
* - __u8
- ``sps_max_latency_increase_plus1``
- -
+ - Not equal to 0 is used to compute the value of SpsMaxLatencyPictures[i].
* - __u8
- ``log2_min_luma_coding_block_size_minus3``
- -
+ - Plus 3 specifies the minimum luma coding block size.
* - __u8
- ``log2_diff_max_min_luma_coding_block_size``
- -
+ - Specifies the difference between the maximum and minimum luma coding block size.
* - __u8
- ``log2_min_luma_transform_block_size_minus2``
- -
+ - Plus 2 specifies the minimum luma transform block size.
* - __u8
- ``log2_diff_max_min_luma_transform_block_size``
- -
+ - Specifies the difference between the maximum and minimum luma transform block size.
* - __u8
- ``max_transform_hierarchy_depth_inter``
- -
+ - Specifies the maximum hierarchy depth for transform units of coding units coded
+ in inter prediction mode.
* - __u8
- ``max_transform_hierarchy_depth_intra``
- -
+ - Specifies the maximum hierarchy depth for transform units of coding units coded in
+ intra prediction mode.
* - __u8
- ``pcm_sample_bit_depth_luma_minus1``
- -
+ - Specifies the number of bits used to represent each of PCM sample values of the
+ luma component.
* - __u8
- ``pcm_sample_bit_depth_chroma_minus1``
- -
+ - Specifies the number of bits used to represent each of PCM sample values of
+ the chroma components.
* - __u8
- ``log2_min_pcm_luma_coding_block_size_minus3``
- -
+ - Plus 3 specifies the minimum size of coding blocks.
* - __u8
- ``log2_diff_max_min_pcm_luma_coding_block_size``
- -
+ - Specifies the difference between the maximum and minimum size of coding blocks.
* - __u8
- ``num_short_term_ref_pic_sets``
- -
+ - Specifies the number of st_ref_pic_set() syntax structures included in the SPS.
* - __u8
- ``num_long_term_ref_pics_sps``
- -
+ - Specifies the number of candidate long-term reference pictures that are
+ specified in the SPS.
* - __u8
- ``chroma_format_idc``
- -
+ - Specifies the chroma sampling.
* - __u8
- ``sps_max_sub_layers_minus1``
- -
+ - plus 1 specifies the maximum number of temporal sub-layers.
* - __u64
- ``flags``
- See :ref:`Sequence Parameter Set Flags <hevc_sps_flags>`
@@ -2837,7 +2843,8 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
- Identifies the PPS for reference by other syntax elements.
* - __u8
- ``num_extra_slice_header_bits``
- -
+ - Specifies the number of extra slice header bits that are present
+ in the slice header RBSP for coded pictures referring to the PPS.
* - __u8
- ``num_ref_idx_l0_default_active_minus1``
- Specifies the inferred value of num_ref_idx_l0_active_minus1
@@ -2846,37 +2853,42 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
- Specifies the inferred value of num_ref_idx_l1_active_minus1
* - __s8
- ``init_qp_minus26``
- -
+ - Plus 26 specifies the initial value of SliceQp Y for each slice
+ referring to the PPS.
* - __u8
- ``diff_cu_qp_delta_depth``
- -
+ - Specifies the difference between the luma coding tree block size
+ and the minimum luma coding block size of coding units that
+ convey cu_qp_delta_abs and cu_qp_delta_sign_flag.
* - __s8
- ``pps_cb_qp_offset``
- -
+ - Specify the offsets to the luma quantization parameter Cb.
* - __s8
- ``pps_cr_qp_offset``
- -
+ - Specify the offsets to the luma quantization parameter Cr.
* - __u8
- ``num_tile_columns_minus1``
- -
+ - Plus 1 specifies the number of tile columns partitioning the picture.
* - __u8
- ``num_tile_rows_minus1``
- -
+ - Plus 1 specifies the number of tile rows partitioning the picture.
* - __u8
- ``column_width_minus1[20]``
- -
+ - Plus 1 specifies the width of the i-th tile column in units of
+ coding tree blocks.
* - __u8
- ``row_height_minus1[22]``
- -
+ - Plus 1 specifies the height of the i-th tile row in units of coding
+ tree blocks.
* - __s8
- ``pps_beta_offset_div2``
- -
+ - Specify the default deblocking parameter offsets for beta divided by 2.
* - __s8
- ``pps_tc_offset_div2``
- -
+ - Specify the default deblocking parameter offsets for tC divided by 2.
* - __u8
- ``log2_parallel_merge_level_minus2``
- -
+ - Plus 2 specifies the value of the variable Log2ParMrgLevel.
* - __u8
- ``padding[4]``
- Applications and drivers must set this to zero.
@@ -2998,10 +3010,10 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
- Offset (in bits) to the video data in the current slice data.
* - __u8
- ``nal_unit_type``
- -
+ - Specifies the coding type of the slice (B, P or I).
* - __u8
- ``nuh_temporal_id_plus1``
- -
+ - Minus 1 specifies a temporal identifier for the NAL unit.
* - __u8
- ``slice_type``
-
@@ -3009,52 +3021,56 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
V4L2_HEVC_SLICE_TYPE_B).
* - __u8
- ``colour_plane_id``
- -
+ - Specifies the colour plane associated with the current slice.
* - __s32
- ``slice_pic_order_cnt``
- -
+ - Specifies the picture order count.
* - __u8
- ``num_ref_idx_l0_active_minus1``
- -
+ - Specifies the maximum reference index for reference picture list 0
+ that may be used to decode the slice.
* - __u8
- ``num_ref_idx_l1_active_minus1``
- -
+ - Specifies the maximum reference index for reference picture list 1
+ that may be used to decode the slice.
* - __u8
- ``collocated_ref_idx``
- -
+ - Specifies the reference index of the collocated picture used for
+ temporal motion vector prediction.
* - __u8
- ``five_minus_max_num_merge_cand``
- -
+ - Specifies the maximum number of merging motion vector prediction
+ candidates supported in the slice subtracted from 5.
* - __s8
- ``slice_qp_delta``
- -
+ - Specifies the initial value of QpY to be used for the coding blocks in the slice.
* - __s8
- ``slice_cb_qp_offset``
- -
+ - Specifies a difference to be added to the value of pps_cb_qp_offset.
* - __s8
- ``slice_cr_qp_offset``
- -
+ - Specifies a difference to be added to the value of pps_cr_qp_offset.
* - __s8
- ``slice_act_y_qp_offset``
- -
+ - screen content extension parameters
* - __s8
- ``slice_act_cb_qp_offset``
- -
+ - screen content extension parameters
* - __s8
- ``slice_act_cr_qp_offset``
- -
+ - screen content extension parameters
* - __s8
- ``slice_beta_offset_div2``
- -
+ - Specify the deblocking parameter offsets for beta divided by 2.
* - __s8
- ``slice_tc_offset_div2``
- -
+ - Specify the deblocking parameter offsets for tC divided by 2.
* - __u8
- ``pic_struct``
- -
+ - Indicates whether a picture should be displayed as a frame or as one or more fields.
* - __u32
- ``slice_segment_addr``
- -
+ - Specifies the address of the first coding tree block in the slice segment.
* - __u8
- ``ref_idx_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- The list of L0 reference elements as indices in the DPB.
@@ -3219,11 +3235,9 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
- ``field_pic``
- Whether the reference is a field picture or a frame.
See :ref:`HEVC dpb field pic Flags <hevc_dpb_field_pic_flags>`
- * - __u16
- - ``pic_order_cnt[2]``
- - The picture order count of the reference. Only the first element of the
- array is used for frame pictures, while the first element identifies the
- top field and the second the bottom field in field-coded pictures.
+ * - __s32
+ - ``pic_order_cnt_val``
+ - The picture order count of the current picture.
* - __u8
- ``padding[2]``
- Applications and drivers must set this to zero.
@@ -3298,36 +3312,44 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
:stub-columns: 0
:widths: 1 1 2

- * - __u8
- - ``luma_log2_weight_denom``
- -
- * - __s8
- - ``delta_chroma_log2_weight_denom``
- -
* - __s8
- ``delta_luma_weight_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- -
+ - The difference of the weighting factor applied to the luma
+ prediction value for list 0.
* - __s8
- ``luma_offset_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- -
+ - The additive offset applied to the luma prediction value for list 0.
* - __s8
- ``delta_chroma_weight_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2]``
- -
+ - The difference of the weighting factor applied to the chroma
+ prediction value for list 0.
* - __s8
- ``chroma_offset_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2]``
- -
+ - The difference of the additive offset applied to the chroma
+ prediction values for list 0.
* - __s8
- ``delta_luma_weight_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- -
+ - The difference of the weighting factor applied to the luma
+ prediction value for list 1.
* - __s8
- ``luma_offset_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- -
+ - The additive offset applied to the luma prediction value for list 1.
* - __s8
- ``delta_chroma_weight_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2]``
- -
+ - The difference of the weighting factor applied to the chroma
+ prediction value for list 1.
* - __s8
- ``chroma_offset_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2]``
- -
+ - The difference of the additive offset applied to the chroma
+ prediction values for list 1.
+ * - __u8
+ - ``luma_log2_weight_denom``
+ - The base 2 logarithm of the denominator for all luma weighting
+ factors.
+ * - __s8
+ - ``delta_chroma_log2_weight_denom``
+ - The difference of the base 2 logarithm of the denominator for
+ all chroma weighting factors.
* - __u8
- ``padding[6]``
- Applications and drivers must set this to zero.
diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
index f3695ab44389..0dbd5d681c28 100644
--- a/include/media/hevc-ctrls.h
+++ b/include/media/hevc-ctrls.h
@@ -55,9 +55,68 @@ enum v4l2_stateless_hevc_start_code {
#define V4L2_HEVC_SPS_FLAG_SPS_TEMPORAL_MVP_ENABLED (1ULL << 7)
#define V4L2_HEVC_SPS_FLAG_STRONG_INTRA_SMOOTHING_ENABLED (1ULL << 8)

-/* The controls are not stable at the moment and will likely be reworked. */
+/**
+ * struct v4l2_ctrl_hevc_sps - ITU-T Rec. H.265: Sequence parameter set
+ *
+ * @video_parameter_set_id: specifies the value of the
+ * vps_video_parameter_set_id of the active VPS
+ * @seq_parameter_set_id: provides an identifier for the SPS for
+ * reference by other syntax elements
+ * @pic_width_in_luma_samples: specifies the width of each decoded picture
+ * in units of luma samples
+ * @pic_height_in_luma_samples: specifies the height of each decoded picture
+ * in units of luma samples
+ * @bit_depth_luma_minus8: specifies the bit depth of the samples of the
+ * luma array
+ * @bit_depth_chroma_minus8: specifies the bit depth of the samples of the
+ * chroma arrays
+ * @log2_max_pic_order_cnt_lsb_minus4: specifies the value of the variable
+ * MaxPicOrderCntLsb
+ * @sps_max_dec_pic_buffering_minus1: plus 1 specifies the maximum required
+ * size of the decoded picture buffer for
+ * the CVS
+ * @sps_max_num_reorder_pics: indicates the maximum allowed number of pictures
+ * @sps_max_latency_increase_plus1: not equal to 0 is used to compute the
+ * value of SpsMaxLatencyPictures[i]
+ * @log2_min_luma_coding_block_size_minus3: plus 3 specifies the minimum
+ * luma coding block size
+ * @log2_diff_max_min_luma_coding_block_size: specifies the difference between
+ * the maximum and minimum luma
+ * coding block size
+ * @log2_min_luma_transform_block_size_minus2: plus 2 specifies the minimum luma
+ * transform block size
+ * @log2_diff_max_min_luma_transform_block_size: specifies the difference between
+ * the maximum and minimum luma
+ * transform block size
+ * @max_transform_hierarchy_depth_inter: specifies the maximum hierarchy
+ * depth for transform units of
+ * coding units coded in inter
+ * prediction mode
+ * @max_transform_hierarchy_depth_intra: specifies the maximum hierarchy
+ * depth for transform units of
+ * coding units coded in intra
+ * prediction mode
+ * @pcm_sample_bit_depth_luma_minus1: specifies the number of bits used to
+ * represent each of PCM sample values of the
+ * luma component
+ * @pcm_sample_bit_depth_chroma_minus1: specifies the number of bits used to
+ * represent each of PCM sample values of
+ * the chroma components
+ * @log2_min_pcm_luma_coding_block_size_minus3: plus 3 specifies the minimum size
+ * of coding blocks
+ * @log2_diff_max_min_pcm_luma_coding_block_size: specifies the difference between
+ * the maximum and minimum size of
+ * coding blocks
+ * @num_short_term_ref_pic_sets: specifies the number of st_ref_pic_set()
+ * syntax structures included in the SPS
+ * @num_long_term_ref_pics_sps: specifies the number of candidate long-term
+ * reference pictures that are specified in the SPS
+ * @chroma_format_idc: specifies the chroma sampling
+ * @sps_max_sub_layers_minus1: plus 1 specifies the maximum number of temporal
+ * sub-layers
+ * @flags: see V4L2_HEVC_SPS_FLAG_{}
+ */
struct v4l2_ctrl_hevc_sps {
- /* ISO/IEC 23008-2, ITU-T Rec. H.265: Sequence parameter set */
__u8 video_parameter_set_id;
__u8 seq_parameter_set_id;
__u16 pic_width_in_luma_samples;
@@ -108,8 +167,43 @@ struct v4l2_ctrl_hevc_sps {
#define V4L2_HEVC_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT (1ULL << 19)
#define V4L2_HEVC_PPS_FLAG_UNIFORM_SPACING (1ULL << 20)

+/**
+ * struct v4l2_ctrl_hevc_pps - ITU-T Rec. H.265: Picture parameter set
+ *
+ * @pic_parameter_set_id: identifies the PPS for reference by other
+ * syntax elements
+ * @num_extra_slice_header_bits: specifies the number of extra slice header
+ * bits that are present in the slice header RBSP
+ * for coded pictures referring to the PPS.
+ * @num_ref_idx_l0_default_active_minus1: specifies the inferred value of
+ * num_ref_idx_l0_active_minus1
+ * @num_ref_idx_l1_default_active_minus1: specifies the inferred value of
+ * num_ref_idx_l1_active_minus1
+ * @init_qp_minus26: plus 26 specifies the initial value of SliceQp Y for
+ * each slice referring to the PPS
+ * @diff_cu_qp_delta_depth: specifies the difference between the luma coding
+ * tree block size and the minimum luma coding block
+ * size of coding units that convey cu_qp_delta_abs
+ * and cu_qp_delta_sign_flag
+ * @pps_cb_qp_offset: specify the offsets to the luma quantization parameter Cb
+ * @pps_cr_qp_offset: specify the offsets to the luma quantization parameter Cr
+ * @num_tile_columns_minus1: plus 1 specifies the number of tile columns
+ * partitioning the picture
+ * @num_tile_rows_minus1: plus 1 specifies the number of tile rows partitioning
+ * the picture
+ * @column_width_minus1: plus 1 specifies the width of the i-th tile column in
+ * units of coding tree blocks
+ * @row_height_minus1: plus 1 specifies the height of the i-th tile row in
+ * units of coding tree blocks
+ * @pps_beta_offset_div2: specify the default deblocking parameter offsets for
+ * beta divided by 2
+ * @pps_tc_offset_div2: specify the default deblocking parameter offsets for tC
+ * divided by 2
+ * @log2_parallel_merge_level_minus2: plus 2 specifies the value of the variable
+ * Log2ParMrgLevel
+ * @flags: see V4L2_HEVC_PPS_FLAG_{}
+ */
struct v4l2_ctrl_hevc_pps {
- /* ISO/IEC 23008-2, ITU-T Rec. H.265: Picture parameter set */
__u8 pic_parameter_set_id;
__u8 num_extra_slice_header_bits;
__u8 num_ref_idx_l0_default_active_minus1;
@@ -148,6 +242,14 @@ struct v4l2_ctrl_hevc_pps {

#define V4L2_HEVC_DPB_ENTRIES_NUM_MAX 16

+/**
+ * struct v4l2_hevc_dpb_entry - HEVC decoded picture buffer entry
+ *
+ * @timestamp: timestamp of the V4L2 capture buffer to use as reference.
+ * @flags: long term flag for the reference frame
+ * @field_pic: whether the reference is a field picture or a frame.
+ * @pic_order_cnt_val: the picture order count of the reference.
+ */
struct v4l2_hevc_dpb_entry {
__u64 timestamp;
__u8 flags;
@@ -156,6 +258,31 @@ struct v4l2_hevc_dpb_entry {
__u8 padding[2];
};

+/**
+ * struct v4l2_hevc_pred_weight_table - HEVC weighted prediction parameters
+ *
+ * @delta_luma_weight_l0: the difference of the weighting factor applied
+ * to the luma prediction value for list 0
+ * @luma_offset_l0: the additive offset applied to the luma prediction value
+ * for list 0
+ * @delta_chroma_weight_l0: the difference of the weighting factor applied
+ * to the chroma prediction values for list 0
+ * @chroma_offset_l0: the difference of the additive offset applied to
+ * the chroma prediction values for list 0
+ * @delta_luma_weight_l1: the difference of the weighting factor applied
+ * to the luma prediction value for list 1
+ * @luma_offset_l1: the additive offset applied to the luma prediction value
+ * for list 1
+ * @delta_chroma_weight_l1: the difference of the weighting factor applied
+ * to the chroma prediction values for list 1
+ * @chroma_offset_l1: the difference of the additive offset applied to
+ * the chroma prediction values for list 1
+ * @luma_log2_weight_denom: the base 2 logarithm of the denominator for
+ * all luma weighting factors
+ * @delta_chroma_log2_weight_denom: the difference of the base 2 logarithm
+ * of the denominator for all chroma
+ * weighting factors
+ */
struct v4l2_hevc_pred_weight_table {
__s8 delta_luma_weight_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__s8 luma_offset_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
@@ -184,6 +311,50 @@ struct v4l2_hevc_pred_weight_table {
#define V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_LOOP_FILTER_ACROSS_SLICES_ENABLED (1ULL << 8)
#define V4L2_HEVC_SLICE_PARAMS_FLAG_DEPENDENT_SLICE_SEGMENT (1ULL << 9)

+/**
+ * v4l2_ctrl_hevc_slice_params - HEVC slice parameters
+ *
+ * @bit_size: size (in bits) of the current slice data
+ * @data_bit_offset: offset (in bits) to the video data in the current slice data
+ * @nal_unit_type: specifies the coding type of the slice (B, P or I)
+ * @nuh_temporal_id_plus1: minus 1 specifies a temporal identifier for the NAL unit
+ * @slice_type: see V4L2_HEVC_SLICE_TYPE_{}
+ * @colour_plane_id: specifies the colour plane associated with the current slice
+ * @slice_pic_order_cnt: specifies the picture order count
+ * @num_ref_idx_l0_active_minus1: specifies the maximum reference index for
+ * reference picture list 0 that may be used to decode
+ * the slice
+ * @num_ref_idx_l1_active_minus1: specifies the maximum reference index for
+ * reference picture list 1 that may be used to decode
+ * the slice
+ * @collocated_ref_idx: specifies the reference index of the collocated picture used
+ * for temporal motion vector prediction
+ * @five_minus_max_num_merge_cand: specifies the maximum number of merging
+ * motion vector prediction candidates supported in
+ * the slice subtracted from 5
+ * @slice_qp_delta: specifies the initial value of QpY to be used for the coding
+ * blocks in the slice
+ * @slice_cb_qp_offset: specifies a difference to be added to the value of pps_cb_qp_offset
+ * @slice_cr_qp_offset: specifies a difference to be added to the value of pps_cr_qp_offset
+ * @slice_act_y_qp_offset: screen content extension parameters
+ * @slice_act_cb_qp_offset: screen content extension parameters
+ * @slice_act_cr_qp_offset: screen content extension parameters
+ * @slice_beta_offset_div2: specify the deblocking parameter offsets for beta divided by 2
+ * @slice_tc_offset_div2: specify the deblocking parameter offsets for tC divided by 2
+ * @pic_struct: indicates whether a picture should be displayed as a frame or as one or
+ * more fields
+ * @slice_segment_addr: specifies the address of the first coding tree block in
+ * the slice segment
+ * @ref_idx_l0: the list of L0 reference elements as indices in the DPB
+ * @ref_idx_l1: the list of L1 reference elements as indices in the DPB
+ * @short_term_ref_pic_set_size: specifies the size of short-term reference
+ * pictures included in the SPS
+ * @long_term_ref_pic_set_size: specifies the size of long-term reference
+ * picture include in the SPS
+ * @pred_weight_table: the prediction weight coefficients for inter-picture
+ * prediction
+ * @flags: see V4L2_HEVC_SLICE_PARAMS_FLAG_{}
+ */
struct v4l2_ctrl_hevc_slice_params {
__u32 bit_size;
__u32 data_bit_offset;
@@ -230,6 +401,28 @@ struct v4l2_ctrl_hevc_slice_params {
#define V4L2_HEVC_DECODE_PARAM_FLAG_IDR_PIC 0x2
#define V4L2_HEVC_DECODE_PARAM_FLAG_NO_OUTPUT_OF_PRIOR 0x4

+/**
+ * struct v4l2_ctrl_hevc_decode_params - HEVC decode parameters
+ *
+ * @pic_order_cnt_val: picture order count
+ * @short_term_ref_pic_set_size: specifies the size of short-term reference
+ * pictures set included in the SPS of the first slice
+ * @long_term_ref_pic_set_size: specifies the size of long-term reference
+ * pictures set include in the SPS of the first slice
+ * @num_active_dpb_entries: the number of entries in dpb
+ * @dpb: the decoded picture buffer, for meta-data about reference frames
+ * @num_poc_st_curr_before: the number of reference pictures in the short-term
+ * set that come before the current frame
+ * @num_poc_st_curr_after: the number of reference pictures in the short-term
+ * set that come after the current frame
+ * @num_poc_lt_curr: the number of reference pictures in the long-term set
+ * @poc_st_curr_before: provides the index of the short term before references
+ * in DPB array
+ * @poc_st_curr_after: provides the index of the short term after references
+ * in DPB array
+ * @poc_lt_curr: provides the index of the long term references in DPB array
+ * @flags: see V4L2_HEVC_DECODE_PARAM_FLAG_{}
+ */
struct v4l2_ctrl_hevc_decode_params {
__s32 pic_order_cnt_val;
__u16 short_term_ref_pic_set_size;
@@ -245,6 +438,28 @@ struct v4l2_ctrl_hevc_decode_params {
__u64 flags;
};

+/**
+ * struct v4l2_ctrl_hevc_scaling_matrix - HEVC scaling lists parameters
+ *
+ * @scaling_list_4x4: scaling list is used for the scaling process for
+ * transform coefficients. The values on each scaling
+ * list are expected in raster scan order
+ * @scaling_list_8x8: scaling list is used for the scaling process for
+ * transform coefficients. The values on each scaling
+ * list are expected in raster scan order
+ * @scaling_list_16x16: scaling list is used for the scaling process for
+ * transform coefficients. The values on each scaling
+ * list are expected in raster scan order
+ * @scaling_list_32x32: scaling list is used for the scaling process for
+ * transform coefficients. The values on each scaling
+ * list are expected in raster scan order
+ * @scaling_list_dc_coef_16x16: scaling list is used for the scaling process
+ * for transform coefficients. The values on each
+ * scaling list are expected in raster scan order.
+ * @scaling_list_dc_coef_32x32: scaling list is used for the scaling process
+ * for transform coefficients. The values on each
+ * scaling list are expected in raster scan order.
+ */
struct v4l2_ctrl_hevc_scaling_matrix {
__u8 scaling_list_4x4[6][16];
__u8 scaling_list_8x8[6][64];