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Karsten Suehring authoredKarsten Suehring authored
CABACReader.h 8.82 KiB
/* The copyright in this software is being made available under the BSD
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* Copyright (c) 2010-2018, ITU/ISO/IEC
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/** \file CABACReader.h
* \brief Reader for low level syntax
*/
#ifndef __CABACREADER__
#define __CABACREADER__
#include "BinDecoder.h"
#include "CommonLib/ContextModelling.h"
#include "CommonLib/MotionInfo.h"
#include "CommonLib/UnitPartitioner.h"
class CABACReader
{
public:
CABACReader( BinDecoderBase& binDecoder ) : m_BinDecoder( binDecoder ), m_Bitstream( 0 ) {}
virtual ~CABACReader() {}
public:
void initCtxModels ( Slice& slice );
void initBitstream ( InputBitstream* bitstream ) { m_Bitstream = bitstream; m_BinDecoder.init( m_Bitstream ); }
const Ctx& getCtx () const { return m_BinDecoder.getCtx(); }
Ctx& getCtx () { return m_BinDecoder.getCtx(); }
public:
// slice segment data (clause 7.3.8.1)
bool terminating_bit ();
void remaining_bytes ( bool noTrailingBytesExpected );
// coding tree unit (clause 7.3.8.2)
bool coding_tree_unit ( CodingStructure& cs, const UnitArea& area, int (&qps)[2], unsigned ctuRsAddr );
// sao (clause 7.3.8.3)
void sao ( CodingStructure& cs, unsigned ctuRsAddr );
// coding (quad)tree (clause 7.3.8.4)
bool coding_tree ( CodingStructure& cs, Partitioner& pm, CUCtx& cuCtx, Partitioner* pPartitionerChroma = nullptr, CUCtx* pCuCtxChroma = nullptr);
bool split_cu_flag ( CodingStructure& cs, Partitioner& pm );
PartSplit split_cu_mode_mt ( CodingStructure& cs, Partitioner& pm );
// coding unit (clause 7.3.8.5)
bool coding_unit ( CodingUnit& cu, Partitioner& pm, CUCtx& cuCtx );
void cu_transquant_bypass_flag ( CodingUnit& cu );
void cu_skip_flag ( CodingUnit& cu );
void pred_mode ( CodingUnit& cu );
void pcm_flag ( CodingUnit& cu, Partitioner& pm );
void cu_pred_data ( CodingUnit& cu );
void cu_gbi_flag ( CodingUnit& cu );
void extend_ref_line (CodingUnit& cu);
void intra_luma_pred_modes ( CodingUnit& cu );
void intra_chroma_pred_modes ( CodingUnit& cu );
bool intra_chroma_lmc_mode ( PredictionUnit& pu );
void intra_chroma_pred_mode ( PredictionUnit& pu );
void cu_residual ( CodingUnit& cu, Partitioner& pm, CUCtx& cuCtx );
void rqt_root_cbf ( CodingUnit& cu );
bool end_of_ctu ( CodingUnit& cu, CUCtx& cuCtx );
// prediction unit (clause 7.3.8.6)
void prediction_unit ( PredictionUnit& pu, MergeCtx& mrgCtx );
void merge_flag ( PredictionUnit& pu );
void merge_data ( PredictionUnit& pu );
void affine_flag ( CodingUnit& cu );
void subblock_merge_flag ( CodingUnit& cu );
void merge_idx ( PredictionUnit& pu );
void mmvd_merge_idx(PredictionUnit& pu);
void imv_mode ( CodingUnit& cu, MergeCtx& mrgCtx );
void inter_pred_idc ( PredictionUnit& pu );
void ref_idx ( PredictionUnit& pu, RefPicList eRefList );
void mvp_flag ( PredictionUnit& pu, RefPicList eRefList );
void MHIntra_flag ( PredictionUnit& pu );
void MHIntra_luma_pred_modes ( CodingUnit& cu );
void triangle_mode ( CodingUnit& cu );
// pcm samples (clause 7.3.8.7)
void pcm_samples ( TransformUnit& tu );
// transform tree (clause 7.3.8.8)
void transform_tree ( CodingStructure& cs, Partitioner& pm, CUCtx& cuCtx, ChromaCbfs& chromaCbfs );
bool cbf_comp ( CodingStructure& cs, const CompArea& area, unsigned depth, const bool prevCbCbf = false );
// mvd coding (clause 7.3.8.9)
void mvd_coding ( Mv &rMvd );
// transform unit (clause 7.3.8.10)
void transform_unit ( TransformUnit& tu, CUCtx& cuCtx, ChromaCbfs& chromaCbfs );
void cu_qp_delta ( CodingUnit& cu, int predQP, int8_t& qp );
void cu_chroma_qp_offset ( CodingUnit& cu );
// residual coding (clause 7.3.8.11)
void residual_coding ( TransformUnit& tu, ComponentID compID );
void transform_skip_flag ( TransformUnit& tu, ComponentID compID );
void emt_tu_index ( TransformUnit& tu );
void emt_cu_flag ( CodingUnit& cu );
void explicit_rdpcm_mode ( TransformUnit& tu, ComponentID compID );
int last_sig_coeff ( CoeffCodingContext& cctx );
void residual_coding_subblock ( CoeffCodingContext& cctx, TCoeff* coeff, const int stateTransTable, int& state );
// cross component prediction (clause 7.3.8.12)
void cross_comp_pred ( TransformUnit& tu, ComponentID compID );
private:
unsigned unary_max_symbol ( unsigned ctxId0, unsigned ctxIdN, unsigned maxSymbol );
unsigned unary_max_eqprob ( unsigned maxSymbol );
unsigned exp_golomb_eqprob ( unsigned count );
unsigned decode_sparse_dt ( DecisionTree& dt ); unsigned get_num_bits_read () { return m_BinDecoder.getNumBitsRead(); }
void xReadTruncBinCode(uint32_t& symbol, uint32_t maxSymbol);
private:
BinDecoderBase& m_BinDecoder;
InputBitstream* m_Bitstream;
};
class CABACDecoder
{
public:
CABACDecoder()
: m_CABACReaderStd ( m_BinDecoderStd )
, m_CABACReader { &m_CABACReaderStd }
{}
CABACReader* getCABACReader ( int id ) { return m_CABACReader[id]; }
private:
BinDecoder_Std m_BinDecoderStd;
CABACReader m_CABACReaderStd;
CABACReader* m_CABACReader[BPM_NUM-1];
};
#endif