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-rw-r--r--Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst519
1 files changed, 486 insertions, 33 deletions
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 01e3b1a3fb99..3fc04daa9ffb 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
@@ -34,7 +34,11 @@ Stateless Codec Control ID
.. c:type:: v4l2_ctrl_h264_sps
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{1.2cm}|p{8.6cm}|p{7.5cm}|
.. flat-table:: struct v4l2_ctrl_h264_sps
:header-rows: 0
@@ -96,6 +100,10 @@ Stateless Codec Control ID
- ``flags``
- See :ref:`Sequence Parameter Set Flags <h264_sps_flags>`
+.. raw:: latex
+
+ \normalsize
+
.. _h264_sps_constraints_set_flags:
``Sequence Parameter Set Constraints Set Flags``
@@ -171,7 +179,9 @@ Stateless Codec Control ID
.. c:type:: v4l2_ctrl_h264_pps
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
.. flat-table:: struct v4l2_ctrl_h264_pps
:header-rows: 0
@@ -212,43 +222,57 @@ Stateless Codec Control ID
- ``flags``
- See :ref:`Picture Parameter Set Flags <h264_pps_flags>`
+.. raw:: latex
+
+ \normalsize
+
.. _h264_pps_flags:
``Picture Parameter Set Flags``
-.. cssclass:: longtable
+.. raw:: latex
+
+ \begingroup
+ \scriptsize
+ \setlength{\tabcolsep}{2pt}
+
+.. tabularcolumns:: |p{9.8cm}|p{1.0cm}|p{6.5cm}|
.. flat-table::
:header-rows: 0
:stub-columns: 0
- :widths: 1 1 2
+ :widths: 10 1 4
* - ``V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE``
- - 0x00000001
+ - 0x0001
-
* - ``V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT``
- - 0x00000002
+ - 0x0002
-
* - ``V4L2_H264_PPS_FLAG_WEIGHTED_PRED``
- - 0x00000004
+ - 0x0004
-
* - ``V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT``
- - 0x00000008
+ - 0x0008
-
* - ``V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED``
- - 0x00000010
+ - 0x0010
-
* - ``V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT``
- - 0x00000020
+ - 0x0020
-
* - ``V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE``
- - 0x00000040
+ - 0x0040
-
* - ``V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT``
- - 0x00000080
- - Indicates that ``V4L2_CID_STATELESS_H264_SCALING_MATRIX``
+ - 0x0080
+ - ``V4L2_CID_STATELESS_H264_SCALING_MATRIX``
must be used for this picture.
+.. raw:: latex
+
+ \endgroup
+
``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
@@ -259,7 +283,11 @@ Stateless Codec Control ID
.. c:type:: v4l2_ctrl_h264_scaling_matrix
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{0.6cm}|p{4.8cm}|p{11.9cm}|
.. flat-table:: struct v4l2_ctrl_h264_scaling_matrix
:header-rows: 0
@@ -290,7 +318,11 @@ Stateless Codec Control ID
.. c:type:: v4l2_ctrl_h264_slice_params
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{4.0cm}|p{5.9cm}|p{7.4cm}|
.. flat-table:: struct v4l2_ctrl_h264_slice_params
:header-rows: 0
@@ -333,11 +365,11 @@ Stateless Codec Control ID
* - __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.
+ 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.
+ set to the value of num_ref_idx_l1_default_active_minus1
* - __u8
- ``reserved``
- Applications and drivers must set this to zero.
@@ -351,6 +383,10 @@ Stateless Codec Control ID
- ``flags``
- See :ref:`Slice Parameter Flags <h264_slice_flags>`
+.. raw:: latex
+
+ \normalsize
+
.. _h264_slice_flags:
``Slice Parameter Set Flags``
@@ -378,7 +414,11 @@ Stateless Codec Control ID
.. c:type:: v4l2_ctrl_h264_pred_weights
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{4.9cm}|p{4.9cm}|p{7.5cm}|
.. flat-table:: struct v4l2_ctrl_h264_pred_weights
:header-rows: 0
@@ -396,9 +436,17 @@ Stateless Codec Control ID
- 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.
+.. raw:: latex
+
+ \normalsize
+
.. c:type:: v4l2_h264_weight_factors
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{1.0cm}|p{4.5cm}|p{11.8cm}|
.. flat-table:: struct v4l2_h264_weight_factors
:header-rows: 0
@@ -418,6 +466,10 @@ Stateless Codec Control ID
- ``chroma_offset[32][2]``
-
+.. raw:: latex
+
+ \normalsize
+
``Picture Reference``
.. c:type:: v4l2_h264_reference
@@ -440,7 +492,11 @@ Stateless Codec Control ID
``Reference Fields``
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{5.4cm}|p{0.8cm}|p{11.1cm}|
.. flat-table::
:header-rows: 0
@@ -458,6 +514,10 @@ Stateless Codec Control ID
- The frame (or the top/bottom fields, if it's a field pair)
is used for short-term reference.
+.. raw:: latex
+
+ \normalsize
+
``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
@@ -469,7 +529,11 @@ Stateless Codec Control ID
.. c:type:: v4l2_ctrl_h264_decode_params
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{4.0cm}|p{5.9cm}|p{7.4cm}|
.. flat-table:: struct v4l2_ctrl_h264_decode_params
:header-rows: 0
@@ -524,11 +588,19 @@ Stateless Codec Control ID
- ``flags``
- See :ref:`Decode Parameters Flags <h264_decode_params_flags>`
+.. raw:: latex
+
+ \normalsize
+
.. _h264_decode_params_flags:
``Decode Parameters Flags``
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{8.3cm}|p{2.1cm}|p{6.9cm}|
.. flat-table::
:header-rows: 0
@@ -545,9 +617,17 @@ Stateless Codec Control ID
- 0x00000004
-
+.. raw:: latex
+
+ \normalsize
+
.. c:type:: v4l2_h264_dpb_entry
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{1.0cm}|p{4.9cm}|p{11.4cm}|
.. flat-table:: struct v4l2_h264_dpb_entry
:header-rows: 0
@@ -583,11 +663,19 @@ Stateless Codec Control ID
- ``flags``
- See :ref:`DPB Entry Flags <h264_dpb_flags>`
+.. raw:: latex
+
+ \normalsize
+
.. _h264_dpb_flags:
``DPB Entries Flags``
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{7.7cm}|p{2.1cm}|p{7.5cm}|
.. flat-table::
:header-rows: 0
@@ -607,6 +695,10 @@ Stateless Codec Control ID
- 0x00000008
- The DPB entry is a single field or a complementary field pair.
+.. raw:: latex
+
+ \normalsize
+
``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.
@@ -619,7 +711,11 @@ Stateless Codec Control ID
.. c:type:: v4l2_stateless_h264_decode_mode
-.. cssclass:: longtable
+.. raw:: latex
+
+ \scriptsize
+
+.. tabularcolumns:: |p{7.4cm}|p{0.3cm}|p{9.6cm}|
.. flat-table::
:header-rows: 0
@@ -644,6 +740,10 @@ Stateless Codec Control ID
selected, the ``V4L2_CID_STATELESS_H264_SLICE_PARAMS``
control shall not be set.
+.. raw:: latex
+
+ \normalsize
+
``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
@@ -655,23 +755,32 @@ Stateless Codec Control ID
.. c:type:: v4l2_stateless_h264_start_code
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{7.9cm}|p{0.4cm}|p{9.0cm}|
.. flat-table::
:header-rows: 0
:stub-columns: 0
- :widths: 1 1 2
+ :widths: 4 1 4
* - ``V4L2_STATELESS_H264_START_CODE_NONE``
- 0
- Selecting this value specifies that H264 slices are passed
- to the driver without any start code.
+ to the driver without any start code. The bitstream data should be
+ according to :ref:`h264` 7.3.1 NAL unit syntax, hence contains
+ emulation prevention bytes when required.
* - ``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.
+.. raw:: latex
+
+ \normalsize
.. _codec-stateless-fwht:
@@ -683,9 +792,11 @@ Stateless Codec Control ID
.. c:type:: v4l2_ctrl_fwht_params
-.. cssclass:: longtable
+.. raw:: latex
+
+ \small
-.. tabularcolumns:: |p{1.4cm}|p{4.3cm}|p{11.8cm}|
+.. tabularcolumns:: |p{1.4cm}|p{3.9cm}|p{12.0cm}|
.. flat-table:: struct v4l2_ctrl_fwht_params
:header-rows: 0
@@ -724,16 +835,20 @@ Stateless Codec Control ID
- ``quantization``
- The quantization range, from enum :c:type:`v4l2_quantization`.
+.. raw:: latex
+ \normalsize
.. _fwht-flags:
FWHT Flags
==========
-.. cssclass:: longtable
+.. raw:: latex
-.. tabularcolumns:: |p{6.8cm}|p{2.4cm}|p{8.3cm}|
+ \small
+
+.. tabularcolumns:: |p{7.0cm}|p{2.3cm}|p{8.0cm}|
.. flat-table::
:header-rows: 0
@@ -778,7 +893,7 @@ FWHT Flags
- Set if this is an I-frame.
* - ``V4L2_FWHT_FL_COMPONENTS_NUM_MSK``
- 0x00070000
- - The number of color components - 1.
+ - The number of color components minus one.
* - ``V4L2_FWHT_FL_PIXENC_MSK``
- 0x00180000
- The mask for the pixel encoding.
@@ -791,3 +906,341 @@ FWHT Flags
* - ``V4L2_FWHT_FL_PIXENC_HSV``
- 0x00180000
- Set if the pixel encoding is HSV.
+
+.. raw:: latex
+
+ \normalsize
+
+.. _v4l2-codec-stateless-vp8:
+
+``V4L2_CID_STATELESS_VP8_FRAME (struct)``
+ Specifies the frame parameters for the associated VP8 parsed frame data.
+ This includes the necessary parameters for
+ configuring a stateless hardware decoding pipeline for VP8.
+ The bitstream parameters are defined according to :ref:`vp8`.
+
+.. c:type:: v4l2_ctrl_vp8_frame
+
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{7.0cm}|p{4.6cm}|p{5.7cm}|
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_vp8_frame
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - struct :c:type:`v4l2_vp8_segment`
+ - ``segment``
+ - Structure with segment-based adjustments metadata.
+ * - struct :c:type:`v4l2_vp8_loop_filter`
+ - ``lf``
+ - Structure with loop filter level adjustments metadata.
+ * - struct :c:type:`v4l2_vp8_quantization`
+ - ``quant``
+ - Structure with VP8 dequantization indices metadata.
+ * - struct :c:type:`v4l2_vp8_entropy`
+ - ``entropy``
+ - Structure with VP8 entropy coder probabilities metadata.
+ * - struct :c:type:`v4l2_vp8_entropy_coder_state`
+ - ``coder_state``
+ - Structure with VP8 entropy coder state.
+ * - __u16
+ - ``width``
+ - The width of the frame. Must be set for all frames.
+ * - __u16
+ - ``height``
+ - The height of the frame. Must be set for all frames.
+ * - __u8
+ - ``horizontal_scale``
+ - Horizontal scaling factor.
+ * - __u8
+ - ``vertical_scaling factor``
+ - Vertical scale.
+ * - __u8
+ - ``version``
+ - Bitstream version.
+ * - __u8
+ - ``prob_skip_false``
+ - Indicates the probability that the macroblock is not skipped.
+ * - __u8
+ - ``prob_intra``
+ - Indicates the probability that a macroblock is intra-predicted.
+ * - __u8
+ - ``prob_last``
+ - Indicates the probability that the last reference frame is used
+ for inter-prediction
+ * - __u8
+ - ``prob_gf``
+ - Indicates the probability that the golden reference frame is used
+ for inter-prediction
+ * - __u8
+ - ``num_dct_parts``
+ - Number of DCT coefficients partitions. Must be one of: 1, 2, 4, or 8.
+ * - __u32
+ - ``first_part_size``
+ - Size of the first partition, i.e. the control partition.
+ * - __u32
+ - ``first_part_header_bits``
+ - Size in bits of the first partition header portion.
+ * - __u32
+ - ``dct_part_sizes[8]``
+ - DCT coefficients sizes.
+ * - __u64
+ - ``last_frame_ts``
+ - Timestamp for the V4L2 capture buffer to use as last reference frame, used
+ with inter-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.
+ * - __u64
+ - ``golden_frame_ts``
+ - Timestamp for the V4L2 capture buffer to use as last reference frame, used
+ with inter-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.
+ * - __u64
+ - ``alt_frame_ts``
+ - Timestamp for the V4L2 capture buffer to use as alternate reference frame, used
+ with inter-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.
+ * - __u64
+ - ``flags``
+ - See :ref:`Frame Flags <vp8_frame_flags>`
+
+.. raw:: latex
+
+ \normalsize
+
+.. _vp8_frame_flags:
+
+``Frame Flags``
+
+.. tabularcolumns:: |p{9.8cm}|p{0.8cm}|p{6.7cm}|
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_VP8_FRAME_FLAG_KEY_FRAME``
+ - 0x01
+ - Indicates if the frame is a key frame.
+ * - ``V4L2_VP8_FRAME_FLAG_EXPERIMENTAL``
+ - 0x02
+ - Experimental bitstream.
+ * - ``V4L2_VP8_FRAME_FLAG_SHOW_FRAME``
+ - 0x04
+ - Show frame flag, indicates if the frame is for display.
+ * - ``V4L2_VP8_FRAME_FLAG_MB_NO_SKIP_COEFF``
+ - 0x08
+ - Enable/disable skipping of macroblocks with no non-zero coefficients.
+ * - ``V4L2_VP8_FRAME_FLAG_SIGN_BIAS_GOLDEN``
+ - 0x10
+ - Sign of motion vectors when the golden frame is referenced.
+ * - ``V4L2_VP8_FRAME_FLAG_SIGN_BIAS_ALT``
+ - 0x20
+ - Sign of motion vectors when the alt frame is referenced.
+
+.. c:type:: v4l2_vp8_entropy_coder_state
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.0cm}|p{2.0cm}|p{14.3cm}|
+
+.. flat-table:: struct v4l2_vp8_entropy_coder_state
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``range``
+ - coder state value for "Range"
+ * - __u8
+ - ``value``
+ - coder state value for "Value"-
+ * - __u8
+ - ``bit_count``
+ - number of bits left.
+ * - __u8
+ - ``padding``
+ - Applications and drivers must set this to zero.
+
+.. c:type:: v4l2_vp8_segment
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.2cm}|p{4.0cm}|p{12.1cm}|
+
+.. flat-table:: struct v4l2_vp8_segment
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __s8
+ - ``quant_update[4]``
+ - Signed quantizer value update.
+ * - __s8
+ - ``lf_update[4]``
+ - Signed loop filter level value update.
+ * - __u8
+ - ``segment_probs[3]``
+ - Segment probabilities.
+ * - __u8
+ - ``padding``
+ - Applications and drivers must set this to zero.
+ * - __u32
+ - ``flags``
+ - See :ref:`Segment Flags <vp8_segment_flags>`
+
+.. _vp8_segment_flags:
+
+``Segment Flags``
+
+.. raw:: latex
+
+ \small
+
+.. tabularcolumns:: |p{10cm}|p{1.0cm}|p{6.3cm}|
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_VP8_SEGMENT_FLAG_ENABLED``
+ - 0x01
+ - Enable/disable segment-based adjustments.
+ * - ``V4L2_VP8_SEGMENT_FLAG_UPDATE_MAP``
+ - 0x02
+ - Indicates if the macroblock segmentation map is updated in this frame.
+ * - ``V4L2_VP8_SEGMENT_FLAG_UPDATE_FEATURE_DATA``
+ - 0x04
+ - Indicates if the segment feature data is updated in this frame.
+ * - ``V4L2_VP8_SEGMENT_FLAG_DELTA_VALUE_MODE``
+ - 0x08
+ - If is set, the segment feature data mode is delta-value.
+ If cleared, it's absolute-value.
+
+.. raw:: latex
+
+ \normalsize
+
+.. c:type:: v4l2_vp8_loop_filter
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{3.9cm}|p{11.9cm}|
+
+.. flat-table:: struct v4l2_vp8_loop_filter
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __s8
+ - ``ref_frm_delta[4]``
+ - Reference adjustment (signed) delta value.
+ * - __s8
+ - ``mb_mode_delta[4]``
+ - Macroblock prediction mode adjustment (signed) delta value.
+ * - __u8
+ - ``sharpness_level``
+ - Sharpness level
+ * - __u8
+ - ``level``
+ - Filter level
+ * - __u16
+ - ``padding``
+ - Applications and drivers must set this to zero.
+ * - __u32
+ - ``flags``
+ - See :ref:`Loop Filter Flags <vp8_loop_filter_flags>`
+
+.. _vp8_loop_filter_flags:
+
+``Loop Filter Flags``
+
+.. tabularcolumns:: |p{7.0cm}|p{1.2cm}|p{9.1cm}|
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_VP8_LF_ADJ_ENABLE``
+ - 0x01
+ - Enable/disable macroblock-level loop filter adjustment.
+ * - ``V4L2_VP8_LF_DELTA_UPDATE``
+ - 0x02
+ - Indicates if the delta values used in an adjustment are updated.
+ * - ``V4L2_VP8_LF_FILTER_TYPE_SIMPLE``
+ - 0x04
+ - If set, indicates the filter type is simple.
+ If cleared, the filter type is normal.
+
+.. c:type:: v4l2_vp8_quantization
+
+.. tabularcolumns:: |p{1.5cm}|p{3.5cm}|p{12.3cm}|
+
+.. flat-table:: struct v4l2_vp8_quantization
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``y_ac_qi``
+ - Luma AC coefficient table index.
+ * - __s8
+ - ``y_dc_delta``
+ - Luma DC delta vaue.
+ * - __s8
+ - ``y2_dc_delta``
+ - Y2 block DC delta value.
+ * - __s8
+ - ``y2_ac_delta``
+ - Y2 block AC delta value.
+ * - __s8
+ - ``uv_dc_delta``
+ - Chroma DC delta value.
+ * - __s8
+ - ``uv_ac_delta``
+ - Chroma AC delta value.
+ * - __u16
+ - ``padding``
+ - Applications and drivers must set this to zero.
+
+.. c:type:: v4l2_vp8_entropy
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{5.8cm}|p{10.0cm}|
+
+.. flat-table:: struct v4l2_vp8_entropy
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``coeff_probs[4][8][3][11]``
+ - Coefficient update probabilities.
+ * - __u8
+ - ``y_mode_probs[4]``
+ - Luma mode update probabilities.
+ * - __u8
+ - ``uv_mode_probs[3]``
+ - Chroma mode update probabilities.
+ * - __u8
+ - ``mv_probs[2][19]``
+ - MV decoding update probabilities.
+ * - __u8
+ - ``padding[3]``
+ - Applications and drivers must set this to zero.