VLCReader.h

/* The copyright in this software is being made available under the BSD
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/** \file     VLCWReader.h
 *  \brief    Reader for high level syntax
 */

#ifndef __VLCREADER__
#define __VLCREADER__

#include "CommonLib/Rom.h"
#include "CommonLib/BitStream.h"
#include "CommonLib/Slice.h"
#include "CommonLib/SampleAdaptiveOffset.h"
#include "CABACReader.h"

#if ENABLE_TRACING

#define READ_CODE(length, code, name)     xReadCodeTr ( length, code, name )
#define READ_UVLC(        code, name)     xReadUvlcTr (         code, name )
#define READ_SVLC(        code, name)     xReadSvlcTr (         code, name )
#define READ_FLAG(        code, name)     xReadFlagTr (         code, name )

#else

#if RExt__DECODER_DEBUG_BIT_STATISTICS

#define READ_CODE(length, code, name)     xReadCode ( length, code, name )
#define READ_UVLC(        code, name)     xReadUvlc (         code, name )
#define READ_SVLC(        code, name)     xReadSvlc (         code, name )
#define READ_FLAG(        code, name)     xReadFlag (         code, name )

#else

#define READ_CODE(length, code, name)     xReadCode ( length, code )
#define READ_UVLC(        code, name)     xReadUvlc (         code )
#define READ_SVLC(        code, name)     xReadSvlc (         code )
#define READ_FLAG(        code, name)     xReadFlag (         code )

#endif

#endif

//! \ingroup DecoderLib
//! \{

// ====================================================================================================================
// Class definition
// ====================================================================================================================

class VLCReader
{
protected:
  InputBitstream*   m_pcBitstream;

  VLCReader() : m_pcBitstream (NULL) {};
  virtual ~VLCReader() {};

#if RExt__DECODER_DEBUG_BIT_STATISTICS
  void  xReadCode    ( uint32_t   length, uint32_t& val, const char *pSymbolName );
  void  xReadUvlc    (                uint32_t& val, const char *pSymbolName );
  void  xReadSvlc    (                 int& val, const char *pSymbolName );
  void  xReadFlag    (                uint32_t& val, const char *pSymbolName );
#else
  void  xReadCode    ( uint32_t   length, uint32_t& val );
  void  xReadUvlc    (                uint32_t& val );
  void  xReadSvlc    (                 int& val );
  void  xReadFlag    (                uint32_t& val );
#endif
#if ENABLE_TRACING
  void  xReadCodeTr  ( uint32_t  length, uint32_t& rValue, const char *pSymbolName );
  void  xReadUvlcTr  (               uint32_t& rValue, const char *pSymbolName );
  void  xReadSvlcTr  (                int& rValue, const char *pSymbolName );
  void  xReadFlagTr  (               uint32_t& rValue, const char *pSymbolName );
#endif
public:
  void  setBitstream ( InputBitstream* p )   { m_pcBitstream = p; }
  InputBitstream* getBitstream() { return m_pcBitstream; }

protected:
  void xReadRbspTrailingBits();
#if JVET_M0101_HLS
  bool isByteAligned() { return (m_pcBitstream->getNumBitsUntilByteAligned() == 0 ); }
#endif
};



class AUDReader: public VLCReader
{
public:
  AUDReader() {};
  virtual ~AUDReader() {};
  void parseAccessUnitDelimiter(InputBitstream* bs, uint32_t &picType);
};



class FDReader: public VLCReader
{
public:
  FDReader() {};
  virtual ~FDReader() {};
  void parseFillerData(InputBitstream* bs, uint32_t &fdSize);
};



class HLSyntaxReader : public VLCReader
{
public:
  HLSyntaxReader();
  virtual ~HLSyntaxReader();

protected:
  void  parseShortTermRefPicSet            (SPS* pcSPS, ReferencePictureSet* pcRPS, int idx);

public:
  void  setBitstream        ( InputBitstream* p )   { m_pcBitstream = p; }
#if HEVC_VPS
  void  parseVPS            ( VPS* pcVPS );
#endif
  void  parseSPS            ( SPS* pcSPS );
  void  parsePPS            ( PPS* pcPPS );
  void  parseAPS            ( APS* pcAPS);
  void  parseVUI            ( VUI* pcVUI, SPS* pcSPS );
#if !JVET_M0101_HLS
  void  parsePTL            ( PTL *rpcPTL, bool profilePresentFlag, int maxNumSubLayersMinus1 );
  void  parseProfileTier    ( ProfileTierLevel *ptl, const bool bIsSubLayer );
#else
  void  parseConstraintInfo   (ConstraintInfo *cinfo);
  void  parseProfileTierLevel ( ProfileTierLevel *ptl, int maxNumSubLayersMinus1);
#endif
  void  parseHrdParameters  ( HRD *hrd, bool cprms_present_flag, uint32_t tempLevelHigh );
  void  parseSliceHeader    ( Slice* pcSlice, ParameterSetManager *parameterSetManager, const int prevTid0POC );
  void  parseTerminatingBit ( uint32_t& ruiBit );
  void  parseRemainingBytes ( bool noTrailingBytesExpected );

  void  parsePredWeightTable( Slice* pcSlice, const SPS *sps );
#if HEVC_USE_SCALING_LISTS
  void  parseScalingList    ( ScalingList* scalingList );
  void  decodeScalingList   ( ScalingList *scalingList, uint32_t sizeId, uint32_t listId);
#endif
  void parseReshaper        ( SliceReshapeInfo& sliceReshaperInfo, const SPS* pcSPS, const bool isIntra );
  void alfFilter( AlfSliceParam& alfSliceParam, const bool isChroma );

private:
  int truncatedUnaryEqProb( const int maxSymbol );
  void xReadTruncBinCode( uint32_t& ruiSymbol, const int uiMaxSymbol );
#if JVET_N0242_NON_LINEAR_ALF
  int  alfGolombDecode( const int k, const bool signed_val=true );
#else
  int  alfGolombDecode( const int k );
#endif

protected:
  bool  xMoreRbspData();
};


//! \}

#endif