[v5,08/17] media: uapi: HEVC: Add document uAPI structure

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
  documentation
 .../media/v4l/ext-ctrls-codec.rst             | 164 +++++++------
 include/media/hevc-ctrls.h                    | 217 +++++++++++++++++-
 2 files changed, 307 insertions(+), 74 deletions(-)

On 07.04.2022 17:29, Benjamin Gaignard wrote:
>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
>  documentation
> .../media/v4l/ext-ctrls-codec.rst             | 164 +++++++------
> include/media/hevc-ctrls.h                    | 217 +++++++++++++++++-
> 2 files changed, 307 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 b44ea85c6f0e..7fcc6c2bac4c 100644
>--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>@@ -2673,70 +2673,76 @@ 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].

This sounds strange. Do you mean:

"Cannot be 0, used to compute the value of ..."

The way it is written now sounds like it being unequal to 0 is used to
compute ...

>     * - __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>`
>@@ -2815,7 +2821,8 @@ 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
>@@ -2824,37 +2831,42 @@ 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.
>@@ -2976,10 +2988,10 @@ 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``
>       -
>@@ -2987,52 +2999,56 @@ 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.
>     * - __u16
>       - ``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

Can you add the section of the specification here, or a bit more of a
description?
Just like this these 3 comments don't really help much and look a bit
like: "I had to write something here".

>     * - __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.
>@@ -3194,11 +3210,9 @@ 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.

Hmmm, you removed the whole top and bottom field semantic from the
documentation but when I look at the Cedrus driver it still uses the
field in a similar manner. So, shouldn't we declare in the documentation
that the field can be used like that?

>     * - __u8
>       - ``padding[2]``
>       - Applications and drivers must set this to zero.
>@@ -3273,36 +3287,44 @@ 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 e76a23e22a35..96a9b71d1def 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]

Same as mentioned in the documentation section

>+ * @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

Same as mentioned in the documentation section.

Greetings,
Sebastian

>+ * @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 +401,24 @@ 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
>+ * @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;
> 	__u8	num_active_dpb_entries;
>@@ -243,6 +432,28 @@ 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];
>-- 
>2.32.0
>