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020c7b6d3c
In preparation for making the interface public, document all the structures. Special care is taken to annotate those fields that depart from the H264 syntax. This commit only adds documentation and doesn't affect functionality in any way. Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
407 lines
15 KiB
C
407 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* These are the H.264 state controls for use with stateless H.264
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* codec drivers.
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*
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* It turns out that these structs are not stable yet and will undergo
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* more changes. So keep them private until they are stable and ready to
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* become part of the official public API.
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*/
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#ifndef _H264_CTRLS_H_
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#define _H264_CTRLS_H_
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#include <linux/videodev2.h>
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/*
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* Maximum DPB size, as specified by section 'A.3.1 Level limits
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* common to the Baseline, Main, and Extended profiles'.
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*/
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#define V4L2_H264_NUM_DPB_ENTRIES 16
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#define V4L2_H264_REF_LIST_LEN (2 * V4L2_H264_NUM_DPB_ENTRIES)
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/* Our pixel format isn't stable at the moment */
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#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
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/*
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* This is put insanely high to avoid conflicting with controls that
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* would be added during the phase where those controls are not
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* stable. It should be fixed eventually.
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*/
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#define V4L2_CID_MPEG_VIDEO_H264_SPS (V4L2_CID_MPEG_BASE+1000)
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#define V4L2_CID_MPEG_VIDEO_H264_PPS (V4L2_CID_MPEG_BASE+1001)
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#define V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX (V4L2_CID_MPEG_BASE+1002)
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#define V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (V4L2_CID_MPEG_BASE+1003)
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#define V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS (V4L2_CID_MPEG_BASE+1004)
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#define V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE (V4L2_CID_MPEG_BASE+1005)
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#define V4L2_CID_MPEG_VIDEO_H264_START_CODE (V4L2_CID_MPEG_BASE+1006)
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#define V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS (V4L2_CID_MPEG_BASE+1007)
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/* enum v4l2_ctrl_type type values */
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#define V4L2_CTRL_TYPE_H264_SPS 0x0110
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#define V4L2_CTRL_TYPE_H264_PPS 0x0111
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#define V4L2_CTRL_TYPE_H264_SCALING_MATRIX 0x0112
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#define V4L2_CTRL_TYPE_H264_SLICE_PARAMS 0x0113
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#define V4L2_CTRL_TYPE_H264_DECODE_PARAMS 0x0114
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#define V4L2_CTRL_TYPE_H264_PRED_WEIGHTS 0x0115
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/**
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* enum v4l2_mpeg_video_h264_decode_mode - Decoding mode
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*
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* @V4L2_MPEG_VIDEO_H264_DECODE_MODE_SLICE_BASED: indicates that decoding
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* is performed one slice at a time. In this mode,
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* V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS must contain the parsed slice
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* parameters and the OUTPUT buffer must contain a single slice.
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* V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF feature is used
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* in order to support multislice frames.
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* @V4L2_MPEG_VIDEO_H264_DECODE_MODE_FRAME_BASED: indicates that
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* decoding is performed per frame. The OUTPUT buffer must contain
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* all slices and also both fields. This mode is typically supported
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* by device drivers that are able to parse the slice(s) header(s)
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* in hardware. When this mode is selected,
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* V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS is not used.
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*/
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enum v4l2_mpeg_video_h264_decode_mode {
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V4L2_MPEG_VIDEO_H264_DECODE_MODE_SLICE_BASED,
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V4L2_MPEG_VIDEO_H264_DECODE_MODE_FRAME_BASED,
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};
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/**
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* enum v4l2_mpeg_video_h264_start_code - Start code
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*
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* @V4L2_MPEG_VIDEO_H264_START_CODE_NONE: slices are passed
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* to the driver without any start code.
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* @V4L2_MPEG_VIDEO_H264_START_CODE_ANNEX_B: slices are passed
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* to the driver with an Annex B start code prefix
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* (legal start codes can be 3-bytes 0x000001 or 4-bytes 0x00000001).
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* This mode is typically supported by device drivers that parse
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* the start code in hardware.
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*/
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enum v4l2_mpeg_video_h264_start_code {
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V4L2_MPEG_VIDEO_H264_START_CODE_NONE,
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V4L2_MPEG_VIDEO_H264_START_CODE_ANNEX_B,
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};
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#define V4L2_H264_SPS_CONSTRAINT_SET0_FLAG 0x01
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#define V4L2_H264_SPS_CONSTRAINT_SET1_FLAG 0x02
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#define V4L2_H264_SPS_CONSTRAINT_SET2_FLAG 0x04
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#define V4L2_H264_SPS_CONSTRAINT_SET3_FLAG 0x08
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#define V4L2_H264_SPS_CONSTRAINT_SET4_FLAG 0x10
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#define V4L2_H264_SPS_CONSTRAINT_SET5_FLAG 0x20
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#define V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE 0x01
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#define V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS 0x02
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#define V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO 0x04
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#define V4L2_H264_SPS_FLAG_GAPS_IN_FRAME_NUM_VALUE_ALLOWED 0x08
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#define V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY 0x10
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#define V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD 0x20
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#define V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE 0x40
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/**
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* struct v4l2_ctrl_h264_sps - H264 sequence parameter set
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*
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* All the members on this sequence parameter set structure match the
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* sequence parameter set syntax as specified by the H264 specification.
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*
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* @profile_idc: see H264 specification.
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* @constraint_set_flags: see H264 specification.
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* @level_idc: see H264 specification.
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* @seq_parameter_set_id: see H264 specification.
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* @chroma_format_idc: see H264 specification.
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* @bit_depth_luma_minus8: see H264 specification.
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* @bit_depth_chroma_minus8: see H264 specification.
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* @log2_max_frame_num_minus4: see H264 specification.
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* @pic_order_cnt_type: see H264 specification.
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* @log2_max_pic_order_cnt_lsb_minus4: see H264 specification.
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* @max_num_ref_frames: see H264 specification.
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* @num_ref_frames_in_pic_order_cnt_cycle: see H264 specification.
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* @offset_for_ref_frame: see H264 specification.
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* @offset_for_non_ref_pic: see H264 specification.
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* @offset_for_top_to_bottom_field: see H264 specification.
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* @pic_width_in_mbs_minus1: see H264 specification.
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* @pic_height_in_map_units_minus1: see H264 specification.
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* @flags: see V4L2_H264_SPS_FLAG_{}.
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*/
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struct v4l2_ctrl_h264_sps {
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__u8 profile_idc;
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__u8 constraint_set_flags;
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__u8 level_idc;
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__u8 seq_parameter_set_id;
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__u8 chroma_format_idc;
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__u8 bit_depth_luma_minus8;
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__u8 bit_depth_chroma_minus8;
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__u8 log2_max_frame_num_minus4;
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__u8 pic_order_cnt_type;
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__u8 log2_max_pic_order_cnt_lsb_minus4;
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__u8 max_num_ref_frames;
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__u8 num_ref_frames_in_pic_order_cnt_cycle;
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__s32 offset_for_ref_frame[255];
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__s32 offset_for_non_ref_pic;
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__s32 offset_for_top_to_bottom_field;
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__u16 pic_width_in_mbs_minus1;
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__u16 pic_height_in_map_units_minus1;
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__u32 flags;
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};
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#define V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE 0x0001
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#define V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT 0x0002
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#define V4L2_H264_PPS_FLAG_WEIGHTED_PRED 0x0004
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#define V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT 0x0008
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#define V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED 0x0010
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#define V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT 0x0020
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#define V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE 0x0040
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#define V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT 0x0080
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/**
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* struct v4l2_ctrl_h264_pps - H264 picture parameter set
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*
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* Except where noted, all the members on this picture parameter set
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* structure match the sequence parameter set syntax as specified
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* by the H264 specification.
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*
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* In particular, V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT flag
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* has a specific meaning. This flag should be set if a non-flat
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* scaling matrix applies to the picture. In this case, applications
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* are expected to use V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX,
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* to pass the values of the non-flat matrices.
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*
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* @pic_parameter_set_id: see H264 specification.
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* @seq_parameter_set_id: see H264 specification.
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* @num_slice_groups_minus1: see H264 specification.
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* @num_ref_idx_l0_default_active_minus1: see H264 specification.
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* @num_ref_idx_l1_default_active_minus1: see H264 specification.
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* @weighted_bipred_idc: see H264 specification.
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* @pic_init_qp_minus26: see H264 specification.
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* @pic_init_qs_minus26: see H264 specification.
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* @chroma_qp_index_offset: see H264 specification.
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* @second_chroma_qp_index_offset: see H264 specification.
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* @flags: see V4L2_H264_PPS_FLAG_{}.
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*/
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struct v4l2_ctrl_h264_pps {
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__u8 pic_parameter_set_id;
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__u8 seq_parameter_set_id;
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__u8 num_slice_groups_minus1;
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__u8 num_ref_idx_l0_default_active_minus1;
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__u8 num_ref_idx_l1_default_active_minus1;
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__u8 weighted_bipred_idc;
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__s8 pic_init_qp_minus26;
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__s8 pic_init_qs_minus26;
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__s8 chroma_qp_index_offset;
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__s8 second_chroma_qp_index_offset;
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__u16 flags;
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};
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/**
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* struct v4l2_ctrl_h264_scaling_matrix - H264 scaling matrices
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*
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* @scaling_list_4x4: scaling matrix after applying the inverse
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* scanning process. Expected list order is Intra Y, Intra Cb,
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* Intra Cr, Inter Y, Inter Cb, Inter Cr. The values on each
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* scaling list are expected in raster scan order.
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* @scaling_list_8x8: scaling matrix after applying the inverse
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* scanning process. Expected list order is Intra Y, Inter Y,
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* Intra Cb, Inter Cb, Intra Cr, Inter Cr. The values on each
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* scaling list are expected in raster scan order.
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*
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* Note that the list order is different for the 4x4 and 8x8
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* matrices as per the H264 specification, see table 7-2 "Assignment
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* of mnemonic names to scaling list indices and specification of
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* fall-back rule".
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*/
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struct v4l2_ctrl_h264_scaling_matrix {
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__u8 scaling_list_4x4[6][16];
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__u8 scaling_list_8x8[6][64];
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};
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struct v4l2_h264_weight_factors {
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__s16 luma_weight[32];
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__s16 luma_offset[32];
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__s16 chroma_weight[32][2];
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__s16 chroma_offset[32][2];
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};
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#define V4L2_H264_CTRL_PRED_WEIGHTS_REQUIRED(pps, slice) \
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((((pps)->flags & V4L2_H264_PPS_FLAG_WEIGHTED_PRED) && \
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((slice)->slice_type == V4L2_H264_SLICE_TYPE_P || \
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(slice)->slice_type == V4L2_H264_SLICE_TYPE_SP)) || \
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((pps)->weighted_bipred_idc == 1 && \
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(slice)->slice_type == V4L2_H264_SLICE_TYPE_B))
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/**
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* struct v4l2_ctrl_h264_pred_weights - Prediction weight table
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*
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* Prediction weight table, which matches the syntax specified
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* by the H264 specification.
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*
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* @luma_log2_weight_denom: see H264 specification.
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* @chroma_log2_weight_denom: see H264 specification.
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* @weight_factors: luma and chroma weight factors.
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*/
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struct v4l2_ctrl_h264_pred_weights {
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__u16 luma_log2_weight_denom;
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__u16 chroma_log2_weight_denom;
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struct v4l2_h264_weight_factors weight_factors[2];
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};
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#define V4L2_H264_SLICE_TYPE_P 0
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#define V4L2_H264_SLICE_TYPE_B 1
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#define V4L2_H264_SLICE_TYPE_I 2
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#define V4L2_H264_SLICE_TYPE_SP 3
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#define V4L2_H264_SLICE_TYPE_SI 4
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#define V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED 0x01
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#define V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH 0x02
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#define V4L2_H264_TOP_FIELD_REF 0x1
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#define V4L2_H264_BOTTOM_FIELD_REF 0x2
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#define V4L2_H264_FRAME_REF 0x3
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/**
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* struct v4l2_h264_reference - H264 picture reference
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*
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* @fields: indicates how the picture is referenced.
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* Valid values are V4L2_H264_{}_REF.
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* @index: index into v4l2_ctrl_h264_decode_params.dpb[].
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*/
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struct v4l2_h264_reference {
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__u8 fields;
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__u8 index;
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};
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/**
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* struct v4l2_ctrl_h264_slice_params - H264 slice parameters
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*
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* This structure holds the H264 syntax elements that are specified
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* as non-invariant for the slices in a given frame.
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*
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* Slice invariant syntax elements are contained in struct
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* v4l2_ctrl_h264_decode_params. This is done to reduce the API surface
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* on frame-based decoders, where slice header parsing is done by the
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* hardware.
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*
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* Slice invariant syntax elements are specified in specification section
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* "7.4.3 Slice header semantics".
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*
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* Except where noted, the members on this struct match the slice header syntax.
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*
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* @header_bit_size: offset in bits to slice_data() from the beginning of this slice.
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* @first_mb_in_slice: see H264 specification.
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* @slice_type: see H264 specification.
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* @colour_plane_id: see H264 specification.
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* @redundant_pic_cnt: see H264 specification.
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* @cabac_init_idc: see H264 specification.
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* @slice_qp_delta: see H264 specification.
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* @slice_qs_delta: see H264 specification.
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* @disable_deblocking_filter_idc: see H264 specification.
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* @slice_alpha_c0_offset_div2: see H264 specification.
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* @slice_beta_offset_div2: see H264 specification.
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* @num_ref_idx_l0_active_minus1: see H264 specification.
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* @num_ref_idx_l1_active_minus1: see H264 specification.
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* @reserved: padding field. Should be zeroed by applications.
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* @ref_pic_list0: reference picture list 0 after applying the per-slice modifications.
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* @ref_pic_list1: reference picture list 1 after applying the per-slice modifications.
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* @flags: see V4L2_H264_SLICE_FLAG_{}.
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*/
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struct v4l2_ctrl_h264_slice_params {
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__u32 header_bit_size;
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__u32 first_mb_in_slice;
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__u8 slice_type;
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__u8 colour_plane_id;
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__u8 redundant_pic_cnt;
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__u8 cabac_init_idc;
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__s8 slice_qp_delta;
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__s8 slice_qs_delta;
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__u8 disable_deblocking_filter_idc;
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__s8 slice_alpha_c0_offset_div2;
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__s8 slice_beta_offset_div2;
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__u8 num_ref_idx_l0_active_minus1;
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__u8 num_ref_idx_l1_active_minus1;
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__u8 reserved;
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struct v4l2_h264_reference ref_pic_list0[V4L2_H264_REF_LIST_LEN];
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struct v4l2_h264_reference ref_pic_list1[V4L2_H264_REF_LIST_LEN];
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__u32 flags;
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};
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#define V4L2_H264_DPB_ENTRY_FLAG_VALID 0x01
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#define V4L2_H264_DPB_ENTRY_FLAG_ACTIVE 0x02
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#define V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM 0x04
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#define V4L2_H264_DPB_ENTRY_FLAG_FIELD 0x08
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/**
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* struct v4l2_h264_dpb_entry - H264 decoded picture buffer entry
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*
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* @reference_ts: timestamp of the V4L2 capture buffer to use as reference.
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* The timestamp refers to the timestamp field in struct v4l2_buffer.
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* Use v4l2_timeval_to_ns() to convert the struct timeval to a __u64.
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* @pic_num: matches PicNum variable assigned during the reference
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* picture lists construction process.
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* @frame_num: frame identifier which matches frame_num syntax element.
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* @fields: indicates how the DPB entry is referenced. Valid values are
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* V4L2_H264_{}_REF.
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* @reserved: padding field. Should be zeroed by applications.
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* @top_field_order_cnt: matches TopFieldOrderCnt picture value.
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* @bottom_field_order_cnt: matches BottomFieldOrderCnt picture value.
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* Note that picture field is indicated by v4l2_buffer.field.
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* @flags: see V4L2_H264_DPB_ENTRY_FLAG_{}.
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*/
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struct v4l2_h264_dpb_entry {
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__u64 reference_ts;
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__u32 pic_num;
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__u16 frame_num;
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__u8 fields;
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__u8 reserved[5];
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__s32 top_field_order_cnt;
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__s32 bottom_field_order_cnt;
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__u32 flags;
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};
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#define V4L2_H264_DECODE_PARAM_FLAG_IDR_PIC 0x01
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#define V4L2_H264_DECODE_PARAM_FLAG_FIELD_PIC 0x02
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#define V4L2_H264_DECODE_PARAM_FLAG_BOTTOM_FIELD 0x04
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/**
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* struct v4l2_ctrl_h264_decode_params - H264 decoding parameters
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*
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* @dpb: decoded picture buffer.
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* @nal_ref_idc: slice header syntax element.
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* @frame_num: slice header syntax element.
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* @top_field_order_cnt: matches TopFieldOrderCnt picture value.
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* @bottom_field_order_cnt: matches BottomFieldOrderCnt picture value.
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* Note that picture field is indicated by v4l2_buffer.field.
|
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* @idr_pic_id: slice header syntax element.
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* @pic_order_cnt_lsb: slice header syntax element.
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|
* @delta_pic_order_cnt_bottom: slice header syntax element.
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|
* @delta_pic_order_cnt0: slice header syntax element.
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|
* @delta_pic_order_cnt1: slice header syntax element.
|
|
* @dec_ref_pic_marking_bit_size: size in bits of dec_ref_pic_marking()
|
|
* syntax element.
|
|
* @pic_order_cnt_bit_size: size in bits of pic order count syntax.
|
|
* @slice_group_change_cycle: slice header syntax element.
|
|
* @reserved: padding field. Should be zeroed by applications.
|
|
* @flags: see V4L2_H264_DECODE_PARAM_FLAG_{}.
|
|
*/
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|
struct v4l2_ctrl_h264_decode_params {
|
|
struct v4l2_h264_dpb_entry dpb[V4L2_H264_NUM_DPB_ENTRIES];
|
|
__u16 nal_ref_idc;
|
|
__u16 frame_num;
|
|
__s32 top_field_order_cnt;
|
|
__s32 bottom_field_order_cnt;
|
|
__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;
|
|
__u32 pic_order_cnt_bit_size;
|
|
__u32 slice_group_change_cycle;
|
|
|
|
__u32 reserved;
|
|
__u32 flags;
|
|
};
|
|
|
|
#endif
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