media: docs: Move the H264 stateless codec uAPI (81c6892d) · Commits · EulixOS / Software / Kernel

Documentation/userspace-api/media/v4l/common.rst

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		@@ -44,6 +44,7 @@ applicable to all devices.
		ext-ctrls-image-source
		ext-ctrls-image-process
		ext-ctrls-codec
		ext-ctrls-codec-stateless
		ext-ctrls-jpeg
		ext-ctrls-dv
		ext-ctrls-rf-tuner

Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst

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		.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later

		.. _codec-stateless-controls:

		*********************************
		Stateless Codec Control Reference
		*********************************

		The Stateless Codec control class is intended to support
		stateless decoder and encoders (i.e. hardware accelerators).

		These drivers are typically supported by the :ref:`stateless_decoder`,
		and deal with parsed pixel formats such as V4L2_PIX_FMT_H264_SLICE.

		Stateless Codec Control ID
		==========================

		.. _codec-stateless-control-id:

		``V4L2_CID_CODEC_STATELESS_CLASS (class)``
		The Stateless Codec class descriptor.

		.. _v4l2-codec-stateless-h264:

		``V4L2_CID_STATELESS_H264_SPS (struct)``
		Specifies the sequence parameter set (as extracted from the
		bitstream) for the associated H264 slice data. This includes the
		necessary parameters for configuring a stateless hardware decoding
		pipeline for H264. The bitstream parameters are defined according
		to :ref:`h264`, section 7.4.2.1.1 "Sequence Parameter Set Data
		Semantics". For further documentation, refer to the above
		specification, unless there is an explicit comment stating
		otherwise.

		.. c:type:: v4l2_ctrl_h264_sps

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_ctrl_h264_sps
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - __u8
		- ``profile_idc``
		-
		* - __u8
		- ``constraint_set_flags``
		- See :ref:`Sequence Parameter Set Constraints Set Flags <h264_sps_constraints_set_flags>`
		* - __u8
		- ``level_idc``
		-
		* - __u8
		- ``seq_parameter_set_id``
		-
		* - __u8
		- ``chroma_format_idc``
		-
		* - __u8
		- ``bit_depth_luma_minus8``
		-
		* - __u8
		- ``bit_depth_chroma_minus8``
		-
		* - __u8
		- ``log2_max_frame_num_minus4``
		-
		* - __u8
		- ``pic_order_cnt_type``
		-
		* - __u8
		- ``log2_max_pic_order_cnt_lsb_minus4``
		-
		* - __u8
		- ``max_num_ref_frames``
		-
		* - __u8
		- ``num_ref_frames_in_pic_order_cnt_cycle``
		-
		* - __s32
		- ``offset_for_ref_frame[255]``
		-
		* - __s32
		- ``offset_for_non_ref_pic``
		-
		* - __s32
		- ``offset_for_top_to_bottom_field``
		-
		* - __u16
		- ``pic_width_in_mbs_minus1``
		-
		* - __u16
		- ``pic_height_in_map_units_minus1``
		-
		* - __u32
		- ``flags``
		- See :ref:`Sequence Parameter Set Flags <h264_sps_flags>`

		.. _h264_sps_constraints_set_flags:

		``Sequence Parameter Set Constraints Set Flags``

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_H264_SPS_CONSTRAINT_SET0_FLAG``
		- 0x00000001
		-
		* - ``V4L2_H264_SPS_CONSTRAINT_SET1_FLAG``
		- 0x00000002
		-
		* - ``V4L2_H264_SPS_CONSTRAINT_SET2_FLAG``
		- 0x00000004
		-
		* - ``V4L2_H264_SPS_CONSTRAINT_SET3_FLAG``
		- 0x00000008
		-
		* - ``V4L2_H264_SPS_CONSTRAINT_SET4_FLAG``
		- 0x00000010
		-
		* - ``V4L2_H264_SPS_CONSTRAINT_SET5_FLAG``
		- 0x00000020
		-

		.. _h264_sps_flags:

		``Sequence Parameter Set Flags``

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE``
		- 0x00000001
		-
		* - ``V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS``
		- 0x00000002
		-
		* - ``V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO``
		- 0x00000004
		-
		* - ``V4L2_H264_SPS_FLAG_GAPS_IN_FRAME_NUM_VALUE_ALLOWED``
		- 0x00000008
		-
		* - ``V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY``
		- 0x00000010
		-
		* - ``V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD``
		- 0x00000020
		-
		* - ``V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE``
		- 0x00000040
		-

		``V4L2_CID_STATELESS_H264_PPS (struct)``
		Specifies the picture parameter set (as extracted from the
		bitstream) for the associated H264 slice data. This includes the
		necessary parameters for configuring a stateless hardware decoding
		pipeline for H264. The bitstream parameters are defined according
		to :ref:`h264`, section 7.4.2.2 "Picture Parameter Set RBSP
		Semantics". For further documentation, refer to the above
		specification, unless there is an explicit comment stating
		otherwise.

		.. c:type:: v4l2_ctrl_h264_pps

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_ctrl_h264_pps
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - __u8
		- ``pic_parameter_set_id``
		-
		* - __u8
		- ``seq_parameter_set_id``
		-
		* - __u8
		- ``num_slice_groups_minus1``
		-
		* - __u8
		- ``num_ref_idx_l0_default_active_minus1``
		-
		* - __u8
		- ``num_ref_idx_l1_default_active_minus1``
		-
		* - __u8
		- ``weighted_bipred_idc``
		-
		* - __s8
		- ``pic_init_qp_minus26``
		-
		* - __s8
		- ``pic_init_qs_minus26``
		-
		* - __s8
		- ``chroma_qp_index_offset``
		-
		* - __s8
		- ``second_chroma_qp_index_offset``
		-
		* - __u16
		- ``flags``
		- See :ref:`Picture Parameter Set Flags <h264_pps_flags>`

		.. _h264_pps_flags:

		``Picture Parameter Set Flags``

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE``
		- 0x00000001
		-
		* - ``V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT``
		- 0x00000002
		-
		* - ``V4L2_H264_PPS_FLAG_WEIGHTED_PRED``
		- 0x00000004
		-
		* - ``V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT``
		- 0x00000008
		-
		* - ``V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED``
		- 0x00000010
		-
		* - ``V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT``
		- 0x00000020
		-
		* - ``V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE``
		- 0x00000040
		-
		* - ``V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT``
		- 0x00000080
		- Indicates that ``V4L2_CID_STATELESS_H264_SCALING_MATRIX``
		must be used for this picture.

		``V4L2_CID_STATELESS_H264_SCALING_MATRIX (struct)``
		Specifies the scaling matrix (as extracted from the bitstream) for
		the associated H264 slice data. The bitstream parameters are
		defined according to :ref:`h264`, section 7.4.2.1.1.1 "Scaling
		List Semantics". For further documentation, refer to the above
		specification, unless there is an explicit comment stating
		otherwise.

		.. c:type:: v4l2_ctrl_h264_scaling_matrix

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_ctrl_h264_scaling_matrix
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - __u8
		- ``scaling_list_4x4[6][16]``
		- Scaling matrix after applying the inverse scanning process.
		Expected list order is Intra Y, Intra Cb, Intra Cr, Inter Y,
		Inter Cb, Inter Cr. The values on each scaling list are
		expected in raster scan order.
		* - __u8
		- ``scaling_list_8x8[6][64]``
		- Scaling matrix after applying the inverse scanning process.
		Expected list order is Intra Y, Inter Y, Intra Cb, Inter Cb,
		Intra Cr, Inter Cr. The values on each scaling list are
		expected in raster scan order.

		``V4L2_CID_STATELESS_H264_SLICE_PARAMS (struct)``
		Specifies the slice parameters (as extracted from the bitstream)
		for the associated H264 slice data. This includes the necessary
		parameters for configuring a stateless hardware decoding pipeline
		for H264. The bitstream parameters are defined according to
		:ref:`h264`, section 7.4.3 "Slice Header Semantics". For further
		documentation, refer to the above specification, unless there is
		an explicit comment stating otherwise.

		.. c:type:: v4l2_ctrl_h264_slice_params

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_ctrl_h264_slice_params
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - __u32
		- ``header_bit_size``
		- Offset in bits to slice_data() from the beginning of this slice.
		* - __u32
		- ``first_mb_in_slice``
		-
		* - __u8
		- ``slice_type``
		-
		* - __u8
		- ``colour_plane_id``
		-
		* - __u8
		- ``redundant_pic_cnt``
		-
		* - __u8
		- ``cabac_init_idc``
		-
		* - __s8
		- ``slice_qp_delta``
		-
		* - __s8
		- ``slice_qs_delta``
		-
		* - __u8
		- ``disable_deblocking_filter_idc``
		-
		* - __s8
		- ``slice_alpha_c0_offset_div2``
		-
		* - __s8
		- ``slice_beta_offset_div2``
		-
		* - __u8
		- ``num_ref_idx_l0_active_minus1``
		- If num_ref_idx_active_override_flag is not set, this field must be
		set to the value of num_ref_idx_l0_default_active_minus1.
		* - __u8
		- ``num_ref_idx_l1_active_minus1``
		- If num_ref_idx_active_override_flag is not set, this field must be
		set to the value of num_ref_idx_l1_default_active_minus1.
		* - __u8
		- ``reserved``
		- Applications and drivers must set this to zero.
		* - struct :c:type:`v4l2_h264_reference`
		- ``ref_pic_list0[32]``
		- Reference picture list after applying the per-slice modifications
		* - struct :c:type:`v4l2_h264_reference`
		- ``ref_pic_list1[32]``
		- Reference picture list after applying the per-slice modifications
		* - __u32
		- ``flags``
		- See :ref:`Slice Parameter Flags <h264_slice_flags>`

		.. _h264_slice_flags:

		``Slice Parameter Set Flags``

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED``
		- 0x00000001
		-
		* - ``V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH``
		- 0x00000002
		-

		``V4L2_CID_STATELESS_H264_PRED_WEIGHTS (struct)``
		Prediction weight table defined according to :ref:`h264`,
		section 7.4.3.2 "Prediction Weight Table Semantics".
		The prediction weight table must be passed by applications
		under the conditions explained in section 7.3.3 "Slice header
		syntax".

		.. c:type:: v4l2_ctrl_h264_pred_weights

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_ctrl_h264_pred_weights
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - __u16
		- ``luma_log2_weight_denom``
		-
		* - __u16
		- ``chroma_log2_weight_denom``
		-
		* - struct :c:type:`v4l2_h264_weight_factors`
		- ``weight_factors[2]``
		- The weight factors at index 0 are the weight factors for the reference
		list 0, the one at index 1 for the reference list 1.

		.. c:type:: v4l2_h264_weight_factors

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_h264_weight_factors
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - __s16
		- ``luma_weight[32]``
		-
		* - __s16
		- ``luma_offset[32]``
		-
		* - __s16
		- ``chroma_weight[32][2]``
		-
		* - __s16
		- ``chroma_offset[32][2]``
		-

		``Picture Reference``

		.. c:type:: v4l2_h264_reference

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_h264_reference
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - __u8
		- ``fields``
		- Specifies how the picture is referenced. See :ref:`Reference Fields <h264_ref_fields>`
		* - __u8
		- ``index``
		- Index into the :c:type:`v4l2_ctrl_h264_decode_params`.dpb array.

		.. _h264_ref_fields:

		``Reference Fields``

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_H264_TOP_FIELD_REF``
		- 0x1
		- The top field in field pair is used for short-term reference.
		* - ``V4L2_H264_BOTTOM_FIELD_REF``
		- 0x2
		- The bottom field in field pair is used for short-term reference.
		* - ``V4L2_H264_FRAME_REF``
		- 0x3
		- The frame (or the top/bottom fields, if it's a field pair)
		is used for short-term reference.

		``V4L2_CID_STATELESS_H264_DECODE_PARAMS (struct)``
		Specifies the decode parameters (as extracted from the bitstream)
		for the associated H264 slice data. This includes the necessary
		parameters for configuring a stateless hardware decoding pipeline
		for H264. The bitstream parameters are defined according to
		:ref:`h264`. For further documentation, refer to the above
		specification, unless there is an explicit comment stating
		otherwise.

		.. c:type:: v4l2_ctrl_h264_decode_params

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_ctrl_h264_decode_params
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - struct :c:type:`v4l2_h264_dpb_entry`
		- ``dpb[16]``
		-
		* - __u16
		- ``nal_ref_idc``
		- NAL reference ID value coming from the NAL Unit header
		* - __u16
		- ``frame_num``
		-
		* - __s32
		- ``top_field_order_cnt``
		- Picture Order Count for the coded top field
		* - __s32
		- ``bottom_field_order_cnt``
		- Picture Order Count for the coded bottom field
		* - __u16
		- ``idr_pic_id``
		-
		* - __u16
		- ``pic_order_cnt_lsb``
		-
		* - __s32
		- ``delta_pic_order_cnt_bottom``
		-
		* - __s32
		- ``delta_pic_order_cnt0``
		-
		* - __s32
		- ``delta_pic_order_cnt1``
		-
		* - __u32
		- ``dec_ref_pic_marking_bit_size``
		- Size in bits of the dec_ref_pic_marking() syntax element.
		* - __u32
		- ``pic_order_cnt_bit_size``
		- Combined size in bits of the picture order count related syntax
		elements: pic_order_cnt_lsb, delta_pic_order_cnt_bottom,
		delta_pic_order_cnt0, and delta_pic_order_cnt1.
		* - __u32
		- ``slice_group_change_cycle``
		-
		* - __u32
		- ``reserved``
		- Applications and drivers must set this to zero.
		* - __u32
		- ``flags``
		- See :ref:`Decode Parameters Flags <h264_decode_params_flags>`

		.. _h264_decode_params_flags:

		``Decode Parameters Flags``

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_H264_DECODE_PARAM_FLAG_IDR_PIC``
		- 0x00000001
		- That picture is an IDR picture
		* - ``V4L2_H264_DECODE_PARAM_FLAG_FIELD_PIC``
		- 0x00000002
		-
		* - ``V4L2_H264_DECODE_PARAM_FLAG_BOTTOM_FIELD``
		- 0x00000004
		-

		.. c:type:: v4l2_h264_dpb_entry

		.. cssclass:: longtable

		.. flat-table:: struct v4l2_h264_dpb_entry
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - __u64
		- ``reference_ts``
		- Timestamp of the V4L2 capture buffer to use as reference, used
		with B-coded and P-coded frames. The timestamp refers to the
		``timestamp`` field in struct :c:type:`v4l2_buffer`. Use the
		:c:func:`v4l2_timeval_to_ns()` function to convert the struct
		:c:type:`timeval` in struct :c:type:`v4l2_buffer` to a __u64.
		* - __u32
		- ``pic_num``
		-
		* - __u16
		- ``frame_num``
		-
		* - __u8
		- ``fields``
		- Specifies how the DPB entry is referenced. See :ref:`Reference Fields <h264_ref_fields>`
		* - __u8
		- ``reserved[5]``
		- Applications and drivers must set this to zero.
		* - __s32
		- ``top_field_order_cnt``
		-
		* - __s32
		- ``bottom_field_order_cnt``
		-
		* - __u32
		- ``flags``
		- See :ref:`DPB Entry Flags <h264_dpb_flags>`

		.. _h264_dpb_flags:

		``DPB Entries Flags``

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_H264_DPB_ENTRY_FLAG_VALID``
		- 0x00000001
		- The DPB entry is valid (non-empty) and should be considered.
		* - ``V4L2_H264_DPB_ENTRY_FLAG_ACTIVE``
		- 0x00000002
		- The DPB entry is used for reference.
		* - ``V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM``
		- 0x00000004
		- The DPB entry is used for long-term reference.
		* - ``V4L2_H264_DPB_ENTRY_FLAG_FIELD``
		- 0x00000008
		- The DPB entry is a single field or a complementary field pair.

		``V4L2_CID_STATELESS_H264_DECODE_MODE (enum)``
		Specifies the decoding mode to use. Currently exposes slice-based and
		frame-based decoding but new modes might be added later on.
		This control is used as a modifier for V4L2_PIX_FMT_H264_SLICE
		pixel format. Applications that support V4L2_PIX_FMT_H264_SLICE
		are required to set this control in order to specify the decoding mode
		that is expected for the buffer.
		Drivers may expose a single or multiple decoding modes, depending
		on what they can support.

		.. c:type:: v4l2_stateless_h264_decode_mode

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED``
		- 0
		- Decoding is done at the slice granularity.
		The OUTPUT buffer must contain a single slice.
		When this mode is selected, the ``V4L2_CID_STATELESS_H264_SLICE_PARAMS``
		control shall be set. When multiple slices compose a frame,
		use of ``V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF`` flag
		is required.
		* - ``V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED``
		- 1
		- Decoding is done at the frame granularity,
		The OUTPUT buffer must contain all slices needed to decode the
		frame. The OUTPUT buffer must also contain both fields.
		This mode will be supported by devices that
		parse the slice(s) header(s) in hardware. When this mode is
		selected, the ``V4L2_CID_STATELESS_H264_SLICE_PARAMS``
		control shall not be set.

		``V4L2_CID_STATELESS_H264_START_CODE (enum)``
		Specifies the H264 slice start code expected for each slice.
		This control is used as a modifier for V4L2_PIX_FMT_H264_SLICE
		pixel format. Applications that support V4L2_PIX_FMT_H264_SLICE
		are required to set this control in order to specify the start code
		that is expected for the buffer.
		Drivers may expose a single or multiple start codes, depending
		on what they can support.

		.. c:type:: v4l2_stateless_h264_start_code

		.. cssclass:: longtable

		.. flat-table::
		:header-rows: 0
		:stub-columns: 0
		:widths: 1 1 2

		* - ``V4L2_STATELESS_H264_START_CODE_NONE``
		- 0
		- Selecting this value specifies that H264 slices are passed
		to the driver without any start code.
		* - ``V4L2_STATELESS_H264_START_CODE_ANNEX_B``
		- 1
		- Selecting this value specifies that H264 slices are expected
		to be prefixed by Annex B start codes. According to :ref:`h264`
		valid start codes can be 3-bytes 0x000001 or 4-bytes 0x00000001.

Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst

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Documentation/userspace-api/media/v4l/pixfmt-compressed.rst

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		@@ -57,18 +57,18 @@ Compressed Formats
		- H264 parsed slice data, including slice headers, either with or
		without the start code, as extracted from the H264 bitstream.
		This format is adapted for stateless video decoders that implement an
		H264 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
		H264 pipeline with the :ref:`stateless_decoder`.
		This pixelformat has two modifiers that must be set at least once
		through the ``V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE``
		and ``V4L2_CID_MPEG_VIDEO_H264_START_CODE`` controls.
		through the ``V4L2_CID_STATELESS_H264_DECODE_MODE``
		and ``V4L2_CID_STATELESS_H264_START_CODE`` controls.
		In addition, metadata associated with the frame to decode are
		required to be passed through the ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
		``V4L2_CID_MPEG_VIDEO_H264_PPS``,
		``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX``,
		``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
		``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls. See the
		:ref:`associated Codec Control IDs <v4l2-mpeg-h264>`. Exactly
		one output and one capture buffer must be provided for use
		required to be passed through the ``V4L2_CID_STATELESS_H264_SPS``,
		``V4L2_CID_STATELESS_H264_PPS``,
		``V4L2_CID_STATELESS_H264_SCALING_MATRIX``,
		``V4L2_CID_STATELESS_H264_SLICE_PARAMS`` and
		``V4L2_CID_STATELESS_H264_DECODE_PARAMS`` controls. See the
		:ref:`associated Codec Control IDs <v4l2-codec-stateless-h264>`.
		Exactly one output and one capture buffer must be provided for use
		with this pixel format. The output buffer must contain the
		appropriate number of macroblocks to decode a full
		corresponding frame to the matching capture buffer.
		@@ -77,11 +77,6 @@ Compressed Formats
		7.3.2.8 "Slice layer without partitioning RBSP syntax" and the following
		sections.

		.. note::

		This format is not yet part of the public kernel API and it
		is expected to change.

		* .. _V4L2-PIX-FMT-H263:

		- ``V4L2_PIX_FMT_H263``

Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst

+24 −0

Original line number	Diff line number	Diff line
		@@ -184,6 +184,30 @@ still cause this situation.
		- ``p_area``
		- A pointer to a struct :c:type:`v4l2_area`. Valid if this control is
		of type ``V4L2_CTRL_TYPE_AREA``.
		* - :c:type:`v4l2_ctrl_h264_sps` *
		- ``p_h264_sps``
		- A pointer to a struct :c:type:`v4l2_ctrl_h264_sps`. Valid if this control is
		of type ``V4L2_CTRL_TYPE_H264_SPS``.
		* - :c:type:`v4l2_ctrl_h264_pps` *
		- ``p_h264_pps``
		- A pointer to a struct :c:type:`v4l2_ctrl_h264_pps`. Valid if this control is
		of type ``V4L2_CTRL_TYPE_H264_PPS``.
		* - :c:type:`v4l2_ctrl_h264_scaling_matrix` *
		- ``p_h264_scaling_matrix``
		- A pointer to a struct :c:type:`v4l2_ctrl_h264_scaling_matrix`. Valid if this control is
		of type ``V4L2_CTRL_TYPE_H264_SCALING_MATRIX``.
		* - :c:type:`v4l2_ctrl_h264_pred_weights` *
		- ``p_h264_pred_weights``
		- A pointer to a struct :c:type:`v4l2_ctrl_h264_pred_weights`. Valid if this control is
		of type ``V4L2_CTRL_TYPE_H264_PRED_WEIGHTS``.
		* - :c:type:`v4l2_ctrl_h264_slice_params` *
		- ``p_h264_slice_params``
		- A pointer to a struct :c:type:`v4l2_ctrl_h264_slice_params`. Valid if this control is
		of type ``V4L2_CTRL_TYPE_H264_SLICE_PARAMS``.
		* - :c:type:`v4l2_ctrl_h264_decode_params` *
		- ``p_h264_decode_params``
		- A pointer to a struct :c:type:`v4l2_ctrl_h264_decode_params`. Valid if this control is
		of type ``V4L2_CTRL_TYPE_H264_DECODE_PARAMS``.
		* - void *
		- ``ptr``
		- A pointer to a compound type which can be an N-dimensional array