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5cbeefc79e
FFmpeg/libavcodec/hevcdec.h
Andreas Rheinhardt c1cdaef5ce avcodec/hevc_cabac: Let compiler count offsets 
This is easily possible with an X macro.
Using an enum for the offsets also allows to remove
two arrays which are not really needed and will typically
be optimized away by the compiler: The first just exists
to count the number of syntax elements*, the second one
exists to get offset[CONSTANT]. These constants were
of type enum SyntaxElement and this enum was only used
in hevc_cabac.c (although it was declared in hevcdec.h);
it is now no longer needed at all and has therefore been
removed.

The first of these arrays led to a warning from Clang
which is fixed by this commit:
warning: variable 'num_bins_in_se' is not needed and will
not be emitted [-Wunneeded-internal-declaration]

*: One could also just added a trailing SYNTAX_ELEMENT_NB
to the SyntaxElement enum for this purpose.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-13 23:29:02 +01:00

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/*
* HEVC video decoder
*
* Copyright (C) 2012 - 2013 Guillaume Martres
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_HEVCDEC_H
#define AVCODEC_HEVCDEC_H
#include <stdatomic.h>
#include "libavutil/buffer.h"
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "cabac.h"
#include "dovi_rpu.h"
#include "get_bits.h"
#include "hevcpred.h"
#include "h2645_parse.h"
#include "hevc.h"
#include "hevc_ps.h"
#include "hevc_sei.h"
#include "hevcdsp.h"
#include "h274.h"
#include "threadframe.h"
#include "videodsp.h"
#define SHIFT_CTB_WPP 2
#define MAX_TB_SIZE 32
#define MAX_QP 51
#define DEFAULT_INTRA_TC_OFFSET 2
#define HEVC_CONTEXTS 199
#define HEVC_STAT_COEFFS 4
#define MRG_MAX_NUM_CANDS 5
#define L0 0
#define L1 1
#define EPEL_EXTRA_BEFORE 1
#define EPEL_EXTRA_AFTER 2
#define EPEL_EXTRA 3
#define QPEL_EXTRA_BEFORE 3
#define QPEL_EXTRA_AFTER 4
#define QPEL_EXTRA 7
#define EDGE_EMU_BUFFER_STRIDE 80
/**
* Value of the luma sample at position (x, y) in the 2D array tab.
*/
#define SAMPLE(tab, x, y) ((tab)[(y) * s->sps->width + (x)])
#define SAMPLE_CTB(tab, x, y) ((tab)[(y) * min_cb_width + (x)])
#define IS_IDR(s) ((s)->nal_unit_type == HEVC_NAL_IDR_W_RADL || (s)->nal_unit_type == HEVC_NAL_IDR_N_LP)
#define IS_BLA(s) ((s)->nal_unit_type == HEVC_NAL_BLA_W_RADL || (s)->nal_unit_type == HEVC_NAL_BLA_W_LP || \
(s)->nal_unit_type == HEVC_NAL_BLA_N_LP)
#define IS_IRAP(s) ((s)->nal_unit_type >= HEVC_NAL_BLA_W_LP && (s)->nal_unit_type <= HEVC_NAL_RSV_IRAP_VCL23)
enum RPSType {
ST_CURR_BEF = 0,
ST_CURR_AFT,
ST_FOLL,
LT_CURR,
LT_FOLL,
NB_RPS_TYPE,
};
enum PartMode {
PART_2Nx2N = 0,
PART_2NxN = 1,
PART_Nx2N = 2,
PART_NxN = 3,
PART_2NxnU = 4,
PART_2NxnD = 5,
PART_nLx2N = 6,
PART_nRx2N = 7,
};
enum PredMode {
MODE_INTER = 0,
MODE_INTRA,
MODE_SKIP,
};
enum InterPredIdc {
PRED_L0 = 0,
PRED_L1,
PRED_BI,
};
enum PredFlag {
PF_INTRA = 0,
PF_L0,
PF_L1,
PF_BI,
};
enum IntraPredMode {
INTRA_PLANAR = 0,
INTRA_DC,
INTRA_ANGULAR_2,
INTRA_ANGULAR_3,
INTRA_ANGULAR_4,
INTRA_ANGULAR_5,
INTRA_ANGULAR_6,
INTRA_ANGULAR_7,
INTRA_ANGULAR_8,
INTRA_ANGULAR_9,
INTRA_ANGULAR_10,
INTRA_ANGULAR_11,
INTRA_ANGULAR_12,
INTRA_ANGULAR_13,
INTRA_ANGULAR_14,
INTRA_ANGULAR_15,
INTRA_ANGULAR_16,
INTRA_ANGULAR_17,
INTRA_ANGULAR_18,
INTRA_ANGULAR_19,
INTRA_ANGULAR_20,
INTRA_ANGULAR_21,
INTRA_ANGULAR_22,
INTRA_ANGULAR_23,
INTRA_ANGULAR_24,
INTRA_ANGULAR_25,
INTRA_ANGULAR_26,
INTRA_ANGULAR_27,
INTRA_ANGULAR_28,
INTRA_ANGULAR_29,
INTRA_ANGULAR_30,
INTRA_ANGULAR_31,
INTRA_ANGULAR_32,
INTRA_ANGULAR_33,
INTRA_ANGULAR_34,
};
enum SAOType {
SAO_NOT_APPLIED = 0,
SAO_BAND,
SAO_EDGE,
SAO_APPLIED
};
enum SAOEOClass {
SAO_EO_HORIZ = 0,
SAO_EO_VERT,
SAO_EO_135D,
SAO_EO_45D,
};
enum ScanType {
SCAN_DIAG = 0,
SCAN_HORIZ,
SCAN_VERT,
};
typedef struct HEVCCABACState {
uint8_t state[HEVC_CONTEXTS];
uint8_t stat_coeff[HEVC_STAT_COEFFS];
} HEVCCABACState;
typedef struct LongTermRPS {
int poc[32];
uint8_t poc_msb_present[32];
uint8_t used[32];
uint8_t nb_refs;
} LongTermRPS;
typedef struct RefPicList {
struct HEVCFrame *ref[HEVC_MAX_REFS];
int list[HEVC_MAX_REFS];
int isLongTerm[HEVC_MAX_REFS];
int nb_refs;
} RefPicList;
typedef struct RefPicListTab {
RefPicList refPicList[2];
} RefPicListTab;
typedef struct SliceHeader {
unsigned int pps_id;
///< address (in raster order) of the first block in the current slice segment
unsigned int slice_segment_addr;
///< address (in raster order) of the first block in the current slice
unsigned int slice_addr;
enum HEVCSliceType slice_type;
int pic_order_cnt_lsb;
uint8_t first_slice_in_pic_flag;
uint8_t dependent_slice_segment_flag;
uint8_t pic_output_flag;
uint8_t colour_plane_id;
///< RPS coded in the slice header itself is stored here
int short_term_ref_pic_set_sps_flag;
int short_term_ref_pic_set_size;
ShortTermRPS slice_rps;
const ShortTermRPS *short_term_rps;
int long_term_ref_pic_set_size;
LongTermRPS long_term_rps;
unsigned int list_entry_lx[2][32];
uint8_t rpl_modification_flag[2];
uint8_t no_output_of_prior_pics_flag;
uint8_t slice_temporal_mvp_enabled_flag;
unsigned int nb_refs[2];
uint8_t slice_sample_adaptive_offset_flag[3];
uint8_t mvd_l1_zero_flag;
uint8_t cabac_init_flag;
uint8_t disable_deblocking_filter_flag; ///< slice_header_disable_deblocking_filter_flag
uint8_t slice_loop_filter_across_slices_enabled_flag;
uint8_t collocated_list;
unsigned int collocated_ref_idx;
int slice_qp_delta;
int slice_cb_qp_offset;
int slice_cr_qp_offset;
int slice_act_y_qp_offset;
int slice_act_cb_qp_offset;
int slice_act_cr_qp_offset;
uint8_t cu_chroma_qp_offset_enabled_flag;
int beta_offset; ///< beta_offset_div2 * 2
int tc_offset; ///< tc_offset_div2 * 2
uint8_t max_num_merge_cand; ///< 5 - 5_minus_max_num_merge_cand
uint8_t use_integer_mv_flag;
unsigned *entry_point_offset;
int * offset;
int * size;
int num_entry_point_offsets;
int8_t slice_qp;
uint8_t luma_log2_weight_denom;
int16_t chroma_log2_weight_denom;
int16_t luma_weight_l0[16];
int16_t chroma_weight_l0[16][2];
int16_t chroma_weight_l1[16][2];
int16_t luma_weight_l1[16];
int16_t luma_offset_l0[16];
int16_t chroma_offset_l0[16][2];
int16_t luma_offset_l1[16];
int16_t chroma_offset_l1[16][2];
int slice_ctb_addr_rs;
} SliceHeader;
typedef struct CodingUnit {
int x;
int y;
enum PredMode pred_mode; ///< PredMode
enum PartMode part_mode; ///< PartMode
// Inferred parameters
uint8_t intra_split_flag; ///< IntraSplitFlag
uint8_t max_trafo_depth; ///< MaxTrafoDepth
uint8_t cu_transquant_bypass_flag;
} CodingUnit;
typedef struct Mv {
int16_t x; ///< horizontal component of motion vector
int16_t y; ///< vertical component of motion vector
} Mv;
typedef struct MvField {
DECLARE_ALIGNED(4, Mv, mv)[2];
int8_t ref_idx[2];
int8_t pred_flag;
} MvField;
typedef struct NeighbourAvailable {
int cand_bottom_left;
int cand_left;
int cand_up;
int cand_up_left;
int cand_up_right;
int cand_up_right_sap;
} NeighbourAvailable;
typedef struct PredictionUnit {
int mpm_idx;
int rem_intra_luma_pred_mode;
uint8_t intra_pred_mode[4];
Mv mvd;
uint8_t merge_flag;
uint8_t intra_pred_mode_c[4];
uint8_t chroma_mode_c[4];
} PredictionUnit;
typedef struct TransformUnit {
int cu_qp_delta;
int res_scale_val;
// Inferred parameters;
int intra_pred_mode;
int intra_pred_mode_c;
int chroma_mode_c;
uint8_t is_cu_qp_delta_coded;
uint8_t is_cu_chroma_qp_offset_coded;
int8_t cu_qp_offset_cb;
int8_t cu_qp_offset_cr;
uint8_t cross_pf;
} TransformUnit;
typedef struct DBParams {
int beta_offset;
int tc_offset;
} DBParams;
#define HEVC_FRAME_FLAG_OUTPUT (1 << 0)
#define HEVC_FRAME_FLAG_SHORT_REF (1 << 1)
#define HEVC_FRAME_FLAG_LONG_REF (1 << 2)
#define HEVC_FRAME_FLAG_BUMPING (1 << 3)
#define HEVC_SEQUENCE_COUNTER_MASK 0xff
#define HEVC_SEQUENCE_COUNTER_INVALID (HEVC_SEQUENCE_COUNTER_MASK + 1)
typedef struct HEVCFrame {
AVFrame *frame;
AVFrame *frame_grain;
ThreadFrame tf;
int needs_fg; /* 1 if grain needs to be applied by the decoder */
MvField *tab_mvf; ///< RefStruct reference
RefPicList *refPicList;
RefPicListTab **rpl_tab; ///< RefStruct reference
int ctb_count;
int poc;
RefPicListTab *rpl; ///< RefStruct reference
int nb_rpl_elems;
void *hwaccel_picture_private; ///< RefStruct reference
/**
* A sequence counter, so that old frames are output first
* after a POC reset
*/
uint16_t sequence;
/**
* A combination of HEVC_FRAME_FLAG_*
*/
uint8_t flags;
} HEVCFrame;
typedef struct HEVCLocalContext {
uint8_t cabac_state[HEVC_CONTEXTS];
uint8_t stat_coeff[HEVC_STAT_COEFFS];
uint8_t first_qp_group;
void *logctx;
const struct HEVCContext *parent;
GetBitContext gb;
CABACContext cc;
/**
* This is a pointer to the common CABAC state.
* In case entropy_coding_sync_enabled_flag is set,
* the CABAC state after decoding the second CTU in a row is
* stored here and used to initialize the CABAC state before
* decoding the first CTU in the next row.
* This is the basis for WPP and in case slice-threading is used,
* the next row is decoded by another thread making this state
* shared between threads.
*/
HEVCCABACState *common_cabac_state;
int8_t qp_y;
int8_t curr_qp_y;
int qPy_pred;
TransformUnit tu;
uint8_t ctb_left_flag;
uint8_t ctb_up_flag;
uint8_t ctb_up_right_flag;
uint8_t ctb_up_left_flag;
int end_of_tiles_x;
int end_of_tiles_y;
/* +7 is for subpixel interpolation, *2 for high bit depths */
DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2];
/* The extended size between the new edge emu buffer is abused by SAO */
DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer2)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2];
DECLARE_ALIGNED(32, int16_t, tmp)[MAX_PB_SIZE * MAX_PB_SIZE];
int ct_depth;
CodingUnit cu;
PredictionUnit pu;
NeighbourAvailable na;
#define BOUNDARY_LEFT_SLICE (1 << 0)
#define BOUNDARY_LEFT_TILE (1 << 1)
#define BOUNDARY_UPPER_SLICE (1 << 2)
#define BOUNDARY_UPPER_TILE (1 << 3)
/* properties of the boundary of the current CTB for the purposes
* of the deblocking filter */
int boundary_flags;
} HEVCLocalContext;
typedef struct HEVCContext {
const AVClass *c; // needed by private avoptions
AVCodecContext *avctx;
HEVCLocalContext **HEVClcList;
HEVCLocalContext *HEVClc;
uint8_t threads_type;
uint8_t threads_number;
int width;
int height;
/** 1 if the independent slice segment header was successfully parsed */
uint8_t slice_initialized;
AVFrame *frame;
AVFrame *output_frame;
uint8_t *sao_pixel_buffer_h[3];
uint8_t *sao_pixel_buffer_v[3];
HEVCParamSets ps;
HEVCSEI sei;
struct AVMD5 *md5_ctx;
struct FFRefStructPool *tab_mvf_pool;
struct FFRefStructPool *rpl_tab_pool;
///< candidate references for the current frame
RefPicList rps[5];
SliceHeader sh;
SAOParams *sao;
DBParams *deblock;
enum HEVCNALUnitType nal_unit_type;
int temporal_id; ///< temporal_id_plus1 - 1
HEVCFrame *ref;
HEVCFrame *collocated_ref;
HEVCFrame DPB[32];
int poc;
int pocTid0;
int slice_idx; ///< number of the slice being currently decoded
int eos; ///< current packet contains an EOS/EOB NAL
int last_eos; ///< last packet contains an EOS/EOB NAL
int max_ra;
int bs_width;
int bs_height;
int overlap;
int is_decoded;
int no_rasl_output_flag;
HEVCPredContext hpc;
HEVCDSPContext hevcdsp;
VideoDSPContext vdsp;
BswapDSPContext bdsp;
H274FilmGrainDatabase h274db;
int8_t *qp_y_tab;
uint8_t *horizontal_bs;
uint8_t *vertical_bs;
int32_t *tab_slice_address;
// CU
uint8_t *skip_flag;
uint8_t *tab_ct_depth;
// PU
uint8_t *tab_ipm;
uint8_t *cbf_luma; // cbf_luma of colocated TU
uint8_t *is_pcm;
// CTB-level flags affecting loop filter operation
uint8_t *filter_slice_edges;
/** used on BE to byteswap the lines for checksumming */
uint8_t *checksum_buf;
int checksum_buf_size;
/**
* Sequence counters for decoded and output frames, so that old
* frames are output first after a POC reset
*/
uint16_t seq_decode;
uint16_t seq_output;
/** The target for the common_cabac_state of the local contexts. */
HEVCCABACState cabac;
int enable_parallel_tiles;
atomic_int wpp_err;
const uint8_t *data;
H2645Packet pkt;
// type of the first VCL NAL of the current frame
enum HEVCNALUnitType first_nal_type;
int is_nalff; ///< this flag is != 0 if bitstream is encapsulated
///< as a format defined in 14496-15
int apply_defdispwin;
int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
int nuh_layer_id;
int film_grain_warning_shown;
AVBufferRef *rpu_buf; ///< 0 or 1 Dolby Vision RPUs.
DOVIContext dovi_ctx; ///< Dolby Vision decoding context
} HEVCContext;
/**
* Mark all frames in DPB as unused for reference.
*/
void ff_hevc_clear_refs(HEVCContext *s);
/**
* Drop all frames currently in DPB.
*/
void ff_hevc_flush_dpb(HEVCContext *s);
const RefPicList *ff_hevc_get_ref_list(const HEVCContext *s, const HEVCFrame *frame,
int x0, int y0);
/**
* Construct the reference picture sets for the current frame.
*/
int ff_hevc_frame_rps(HEVCContext *s);
/**
* Construct the reference picture list(s) for the current slice.
*/
int ff_hevc_slice_rpl(HEVCContext *s);
void ff_hevc_save_states(HEVCLocalContext *lc, int ctb_addr_ts);
int ff_hevc_cabac_init(HEVCLocalContext *lc, int ctb_addr_ts);
int ff_hevc_sao_merge_flag_decode(HEVCLocalContext *lc);
int ff_hevc_sao_type_idx_decode(HEVCLocalContext *lc);
int ff_hevc_sao_band_position_decode(HEVCLocalContext *lc);
int ff_hevc_sao_offset_abs_decode(HEVCLocalContext *lc);
int ff_hevc_sao_offset_sign_decode(HEVCLocalContext *lc);
int ff_hevc_sao_eo_class_decode(HEVCLocalContext *lc);
int ff_hevc_end_of_slice_flag_decode(HEVCLocalContext *lc);
int ff_hevc_cu_transquant_bypass_flag_decode(HEVCLocalContext *lc);
int ff_hevc_skip_flag_decode(HEVCLocalContext *lc, int x0, int y0,
int x_cb, int y_cb);
int ff_hevc_pred_mode_decode(HEVCLocalContext *lc);
int ff_hevc_split_coding_unit_flag_decode(HEVCLocalContext *lc, int ct_depth,
int x0, int y0);
int ff_hevc_part_mode_decode(HEVCLocalContext *lc, int log2_cb_size);
int ff_hevc_pcm_flag_decode(HEVCLocalContext *lc);
int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCLocalContext *lc);
int ff_hevc_mpm_idx_decode(HEVCLocalContext *lc);
int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCLocalContext *lc);
int ff_hevc_intra_chroma_pred_mode_decode(HEVCLocalContext *lc);
int ff_hevc_merge_idx_decode(HEVCLocalContext *lc);
int ff_hevc_merge_flag_decode(HEVCLocalContext *lc);
int ff_hevc_inter_pred_idc_decode(HEVCLocalContext *lc, int nPbW, int nPbH);
int ff_hevc_ref_idx_lx_decode(HEVCLocalContext *lc, int num_ref_idx_lx);
int ff_hevc_mvp_lx_flag_decode(HEVCLocalContext *lc);
int ff_hevc_no_residual_syntax_flag_decode(HEVCLocalContext *lc);
int ff_hevc_split_transform_flag_decode(HEVCLocalContext *lc, int log2_trafo_size);
int ff_hevc_cbf_cb_cr_decode(HEVCLocalContext *lc, int trafo_depth);
int ff_hevc_cbf_luma_decode(HEVCLocalContext *lc, int trafo_depth);
int ff_hevc_log2_res_scale_abs(HEVCLocalContext *lc, int idx);
int ff_hevc_res_scale_sign_flag(HEVCLocalContext *lc, int idx);
/**
* Get the number of candidate references for the current frame.
*/
int ff_hevc_frame_nb_refs(const HEVCContext *s);
int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc);
static av_always_inline int ff_hevc_nal_is_nonref(enum HEVCNALUnitType type)
{
switch (type) {
case HEVC_NAL_TRAIL_N:
case HEVC_NAL_TSA_N:
case HEVC_NAL_STSA_N:
case HEVC_NAL_RADL_N:
case HEVC_NAL_RASL_N:
case HEVC_NAL_VCL_N10:
case HEVC_NAL_VCL_N12:
case HEVC_NAL_VCL_N14:
return 1;
default: break;
}
return 0;
}
/**
* Find next frame in output order and put a reference to it in frame.
* @return 1 if a frame was output, 0 otherwise
*/
int ff_hevc_output_frame(HEVCContext *s, AVFrame *frame, int flush);
void ff_hevc_bump_frame(HEVCContext *s);
void ff_hevc_unref_frame(HEVCFrame *frame, int flags);
void ff_hevc_set_neighbour_available(HEVCLocalContext *lc, int x0, int y0,
int nPbW, int nPbH);
void ff_hevc_luma_mv_merge_mode(HEVCLocalContext *lc, int x0, int y0,
int nPbW, int nPbH, int log2_cb_size,
int part_idx, int merge_idx, MvField *mv);
void ff_hevc_luma_mv_mvp_mode(HEVCLocalContext *lc, int x0, int y0,
int nPbW, int nPbH, int log2_cb_size,
int part_idx, int merge_idx,
MvField *mv, int mvp_lx_flag, int LX);
void ff_hevc_hls_filter(HEVCLocalContext *lc, int x, int y, int ctb_size);
void ff_hevc_hls_filters(HEVCLocalContext *lc, int x_ctb, int y_ctb, int ctb_size);
void ff_hevc_set_qPy(HEVCLocalContext *lc, int xBase, int yBase,
int log2_cb_size);
void ff_hevc_deblocking_boundary_strengths(HEVCLocalContext *lc, int x0, int y0,
int log2_trafo_size);
int ff_hevc_cu_qp_delta_sign_flag(HEVCLocalContext *lc);
int ff_hevc_cu_qp_delta_abs(HEVCLocalContext *lc);
int ff_hevc_cu_chroma_qp_offset_flag(HEVCLocalContext *lc);
int ff_hevc_cu_chroma_qp_offset_idx(HEVCLocalContext *lc);
void ff_hevc_hls_residual_coding(HEVCLocalContext *lc, int x0, int y0,
int log2_trafo_size, enum ScanType scan_idx,
int c_idx);
void ff_hevc_hls_mvd_coding(HEVCLocalContext *lc, int x0, int y0, int log2_cb_size);
extern const uint8_t ff_hevc_qpel_extra_before[4];
extern const uint8_t ff_hevc_qpel_extra_after[4];
extern const uint8_t ff_hevc_qpel_extra[4];
#endif /* AVCODEC_HEVCDEC_H */
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