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/** \file     Quant.cpp

    \brief    transform and quantization class

*/

#include "Quant.h"

#include "UnitTools.h"

#include "ContextModelling.h"

#include "CodingStructure.h"

#include "dtrace_buffer.h"

#include <stdlib.h>

#include <memory.h>

//! \ingroup CommonLib

//! \{

namespace vvenc {

// ====================================================================================================================

// Constants

// ====================================================================================================================

// ====================================================================================================================

// QpParam constructor

// ====================================================================================================================

QpParam::QpParam(const TransformUnit& tu, const ComponentID &compID, const bool allowACTQpoffset)

{

  const ChannelType chType = toChannelType( compID );

  const SPS        &sps    = *tu.cu->cs->sps;

  const int     qpBdOffset = sps.qpBDOffset[chType];

  const bool useJQP        = isChroma( compID ) && abs( TU::getICTMode( tu ) ) == 2;

  const ComponentID jCbCr  = useJQP ? COMP_JOINT_CbCr : compID;

        int chromaQpOffset = 0;

  if( isChroma( compID ) )

  {

    const PPS &pps  = *tu.cu->slice->pps;

    chromaQpOffset  = pps.chromaQpOffset              [jCbCr];

    chromaQpOffset += tu.cu->slice->sliceChromaQpDelta[jCbCr];

    chromaQpOffset += pps.getChromaQpOffsetListEntry( tu.cu->chromaQpAdj ).u.offset[int( jCbCr ) - 1];

  }

  int baseQp;

  int qpy        = tu.cu->qp;

  //bool skip      = tu.mtsIdx[compID] == MTS_SKIP;

  if( isLuma( compID ) )

  {

    baseQp = tu.cu->qp + qpBdOffset;

  }

  else

  {

    int qpi = Clip3( -qpBdOffset, MAX_QP, qpy );

    baseQp  = sps.chromaQpMappingTable.getMappedChromaQpValue( jCbCr, qpi );

    baseQp  = Clip3( -qpBdOffset, MAX_QP, baseQp + chromaQpOffset ) + qpBdOffset;

  }

  if( allowACTQpoffset && tu.cu->colorTransform )

  {

    baseQp += DELTA_QP_ACT[jCbCr];

  }

  baseQp = Clip3( 0, MAX_QP + qpBdOffset, baseQp );

  //if( !skip )

  {

    Qps [0] = baseQp;

    pers[0] = baseQp / 6;

    rems[0] = baseQp % 6;

  }

  //else

  {

    int internalMinusInputBitDepth = sps.internalMinusInputBitDepth[chType];

    int baseQpTS           = std::max( baseQp, 4 + 6 * internalMinusInputBitDepth );

    Qps [1] = baseQpTS;

    pers[1] = baseQpTS / 6;

    rems[1] = baseQpTS % 6;

  }

}

// ====================================================================================================================

// Quant class member functions

// ====================================================================================================================

static void QuantCore(const TransformUnit tu, const ComponentID compID, const CCoeffBuf& piCoef,CoeffSigBuf piQCoef,TCoeff &uiAbsSum, int &lastScanPos,TCoeff *deltaU,const int defaultQuantisationCoefficient,const int iQBits,const int64_t iAdd,const TCoeff entropyCodingMinimum,const TCoeff entropyCodingMaximum,const bool signHiding, const TCoeff m_thrVal)

{

  CoeffCodingContext cctx( tu, compID, signHiding );

  const CompArea &rect      = tu.blocks[compID];

  const uint32_t uiWidth    = rect.width;

  const uint32_t uiHeight   = rect.height;

  /* for 422 chroma blocks, the effective scaling applied during transformation is not a power of 2, hence it cannot be

  * implemented as a bit-shift (the quantised result will be sqrt(2) * larger than required). Alternatively, adjust the

  * uiLog2TrSize applied in iTransformShift, such that the result is 1/sqrt(2) the required result (i.e. smaller)

  * Then a QP+3 (sqrt(2)) or QP-3 (1/sqrt(2)) method could be used to get the required result

  */

  const uint32_t log2CGSize         = cctx.log2CGSize();

  uiAbsSum = 0;

  const int iCGSize   = 1 << log2CGSize;

  const uint32_t lfnstIdx = tu.cu->lfnstIdx;

  const int iCGNum   = lfnstIdx > 0 ? 1 : std::min<int>(JVET_C0024_ZERO_OUT_TH, uiWidth) * std::min<int>(JVET_C0024_ZERO_OUT_TH, uiHeight) >> cctx.log2CGSize();

  int       iScanPos = ( iCGNum << log2CGSize ) - 1;

  if( lfnstIdx > 0 && ( ( uiWidth == 4 && uiHeight == 4 ) || ( uiWidth == 8 && uiHeight == 8 ) ) )

  {

    iScanPos = 7;

  }

  // Find first non-zero coeff

  for( ; iScanPos > 0; iScanPos-- )

  {

    uint32_t uiBlkPos = cctx.blockPos( iScanPos );

    if( piCoef.buf[uiBlkPos] )

      break;

  }

  //////////////////////////////////////////////////////////////////////////

  //  Loop over sub-sets (coefficient groups)

  //////////////////////////////////////////////////////////////////////////

  TCoeff thres = 0, useThres = 0;

  if( iQBits )

    thres = TCoeff( ( int64_t( m_thrVal ) << ( iQBits - 1 ) ) );

  else

    thres = TCoeff( ( int64_t( m_thrVal >> 1 ) << iQBits ) );

  useThres = thres / ( defaultQuantisationCoefficient << 2 );

  const bool is4x4sbb = log2CGSize == 4 && cctx.log2CGWidth() == 2;

  int subSetId = iScanPos >> log2CGSize;

  for( ; subSetId >= 1; subSetId-- )

  {

    if( is4x4sbb && iScanPos >= 16 )

    {

      int  iScanPosinCG = iScanPos & ( iCGSize - 1 );

      bool allSmaller   = true;

      for( int xScanPosinCG = iScanPosinCG, xScanPos = iScanPos; allSmaller && xScanPosinCG >= 0; xScanPosinCG--, xScanPos-- )

      {

        const uint32_t uiBlkPos = cctx.blockPos( xScanPos );

        allSmaller &= abs( piCoef.buf[uiBlkPos] ) <= useThres;

      }

      if( allSmaller )

      {

        iScanPos    -= iScanPosinCG + 1;

        continue;

      }

      else

      {

        break;

      }

    }

  }

  const int qBits8 = iQBits - 8;

  piQCoef.memset( 0 );

  for( int currPos = 0; currPos <= iScanPos; currPos++ )

  {

    const int uiBlockPos  = cctx.blockPos( currPos );

    const TCoeff iLevel   = piCoef.buf[uiBlockPos];

    const TCoeff iSign    = (iLevel < 0 ? -1: 1);

    const int64_t  tmpLevel = (int64_t)abs(iLevel) * defaultQuantisationCoefficient;

    const TCoeff quantisedMagnitude = TCoeff((tmpLevel + iAdd ) >> iQBits);

    deltaU[uiBlockPos] = (TCoeff)((tmpLevel - ((int64_t)quantisedMagnitude<<iQBits) )>> qBits8);

    uiAbsSum += quantisedMagnitude;

    const TCoeff quantisedCoefficient = quantisedMagnitude * iSign;

    piQCoef.buf[uiBlockPos] = Clip3<TCoeff>( entropyCodingMinimum, entropyCodingMaximum, quantisedCoefficient );

  } // for n

  lastScanPos = iScanPos;

}

static void DeQuantCore(const int maxX,const int maxY,const int scale,const TCoeffSig* const piQCoef,const size_t piQCfStride,TCoeff   *const piCoef,const int rightShift,const int inputMaximum,const TCoeff transformMaximum)

{

  const int inputMinimum = -(inputMaximum+1);

  const TCoeff transformMinimum = -(transformMaximum+1);

  if (rightShift>0)

  {

    const Intermediate_Int iAdd = (Intermediate_Int) 1 << (rightShift - 1);

    for( int y = 0, n = 0; y <= maxY; y++)

    {

      for( int x = 0; x <= maxX; x++, n++ )

      {

        const TCoeff           clipQCoef = TCoeff(Clip3<Intermediate_Int>(inputMinimum, inputMaximum, piQCoef[x + y * piQCfStride]));

        Intermediate_Int iCoeffQ   = (Intermediate_Int(clipQCoef) * scale + iAdd) >> rightShift;

        piCoef[n] = TCoeff(Clip3<Intermediate_Int>(transformMinimum,transformMaximum,iCoeffQ));

      }

    }

  }

  else  // rightshift <0

  {

    int leftShift = -rightShift;

    for( int y = 0, n = 0; y <= maxY; y++)

    {

      for( int x = 0; x <= maxX; x++, n++ )

      {

        const TCoeff           clipQCoef = TCoeff(Clip3<Intermediate_Int>(inputMinimum, inputMaximum, piQCoef[x + y * piQCfStride]));

        const Intermediate_Int iCoeffQ   = (Intermediate_Int(clipQCoef) * scale) * (1 << leftShift);

        piCoef[n] = TCoeff(Clip3<Intermediate_Int>(transformMinimum,transformMaximum,iCoeffQ));

      }

    }

  }

}

static bool needRdoqCore( const TCoeff* pCoeff, size_t numCoeff, int quantCoeff, int64_t offset, int shift )

{

  for( int uiBlockPos = 0; uiBlockPos < numCoeff; uiBlockPos++ )

  {

    const TCoeff   iLevel = pCoeff[uiBlockPos];

    const int64_t  tmpLevel = ( int64_t ) std::abs( iLevel ) * quantCoeff;

    const TCoeff quantisedMagnitude = TCoeff( ( tmpLevel + offset ) >> shift );

    if( quantisedMagnitude != 0 )

    {

      return true;

    }

  } // for n

  return false;

}

Quant::Quant( const Quant* other, bool useScalingLists ) : m_RDOQ( 0 ), m_useRDOQTS( false ), m_dLambda( 0.0 )

{

  xInitScalingList( other, useScalingLists );

  xDeQuant  = DeQuantCore;

  xQuant    = QuantCore;

  xNeedRdoq = needRdoqCore;

#if defined( TARGET_SIMD_X86 ) && ENABLE_SIMD_OPT_QUANT

  initQuantX86();

#endif

}

Quant::~Quant()

{

  xDestroyScalingList();

}

void invResDPCM( const TransformUnit& tu, const ComponentID compID, CoeffSigBuf& dstBuf )

{

  const CompArea&    rect   = tu.blocks[compID];

  const int          wdt    = rect.width;

  const int          hgt    = rect.height;

  const CCoeffSigBuf coeffs = tu.getCoeffs(compID);

  const int      maxLog2TrDynamicRange = tu.cs->sps->getMaxLog2TrDynamicRange();

  const TCoeff   inputMinimum          = -(1 << maxLog2TrDynamicRange);

  const TCoeff   inputMaximum          =  (1 << maxLog2TrDynamicRange) - 1;

  const TCoeffSig* coef = &coeffs.buf[0];

        TCoeffSig* dst  = &dstBuf.buf[0];

  if ( tu.cu->bdpcmM[toChannelType(compID)] == 1)

  {

    for( int y = 0; y < hgt; y++ )

    {

      dst[0] = coef[0];

      for( int x = 1; x < wdt; x++ )

      {

        dst[x] = Clip3(inputMinimum, inputMaximum, TCoeff( dst[x - 1] ) + TCoeff( coef[x] ));

      }

      coef += coeffs.stride;

      dst += dstBuf.stride;

    }

  }

  else

  {

    for( int x = 0; x < wdt; x++ )

    {

      dst[x] = coef[x];

    }

    for( int y = 0; y < hgt - 1; y++ )

    {

      for( int x = 0; x < wdt; x++ )

      {

        dst[dstBuf.stride + x] = Clip3(inputMinimum, inputMaximum, TCoeff( dst[x] ) + TCoeff( coef[coeffs.stride + x] ));

      }

      coef += coeffs.stride;

      dst += dstBuf.stride;

    }

  }

}

void fwdResDPCM( TransformUnit& tu, const ComponentID compID )

{

  const CompArea& rect   = tu.blocks[compID];

  const int       wdt    = rect.width;

  const int       hgt    = rect.height;

  CoeffSigBuf     coeffs = tu.getCoeffs(compID);

  TCoeffSig* coef = &coeffs.buf[0];

  if (tu.cu->bdpcmM[toChannelType(compID)] == 1)

  {

    for( int y = 0; y < hgt; y++ )

    {

      for( int x = wdt - 1; x > 0; x-- )

      {

        coef[x] -= coef[x - 1];

      }

      coef += coeffs.stride;

    }

  }

  else

  {

    coef += coeffs.stride * (hgt - 1);

    for( int y = 0; y < hgt - 1; y++ )

    {

      for ( int x = 0; x < wdt; x++ )

      {

        coef[x] -= coef[x - coeffs.stride];

      }

      coef -= coeffs.stride;

    }

  }

}

// To minimize the distortion only. No rate is considered.

void Quant::xSignBitHidingHDQ( TCoeffSig* pQCoef, const TCoeff* pCoef, TCoeff* deltaU, const CoeffCodingContext& cctx, int& lastScanPos, const int maxLog2TrDynamicRange )

{

  const uint32_t groupSize = 1 << cctx.log2CGSize();

  const TCoeff entropyCodingMinimum = -(1 << maxLog2TrDynamicRange);

  const TCoeff entropyCodingMaximum =  (1 << maxLog2TrDynamicRange) - 1;

  int lastCG = -1;

  int absSum = 0 ;

  int n ;

  for( int subSet = lastScanPos >> cctx.log2CGSize(); subSet >= 0; subSet-- )

  {

    int  subPos = subSet << cctx.log2CGSize();

    int  firstNZPosInCG=groupSize , lastNZPosInCG=-1 ;

    absSum = 0 ;

    for(n = groupSize-1; n >= 0; --n )

    {

      if( pQCoef[ cctx.blockPos( n + subPos ) ] )

      {

        lastNZPosInCG = n;

        break;

      }

    }

    for(n = 0; n <groupSize; n++ )

    {

      if( pQCoef[ cctx.blockPos( n + subPos ) ] )

      {

        firstNZPosInCG = n;

        break;

      }

    }

    for(n = firstNZPosInCG; n <=lastNZPosInCG; n++ )

    {

      absSum += int(pQCoef[ cctx.blockPos( n + subPos ) ]);

    }

    if(lastNZPosInCG>=0 && lastCG==-1)

    {

      lastCG = 1 ;

    }

    if( lastNZPosInCG-firstNZPosInCG>=SBH_THRESHOLD )

    {

      uint32_t signbit = (pQCoef[cctx.blockPos(subPos+firstNZPosInCG)]>0?0:1) ;

      if( signbit!=(absSum&0x1) )  //compare signbit with sum_parity

      {

        TCoeff curCost    = std::numeric_limits<TCoeff>::max();

        TCoeff minCostInc = std::numeric_limits<TCoeff>::max();

        int minPos =-1, finalChange=0, curChange=0, minScanPos = -1;

        for( n = (lastCG==1?lastNZPosInCG:groupSize-1) ; n >= 0; --n )

        {

          uint32_t blkPos   = cctx.blockPos( n+subPos );

          if(pQCoef[ blkPos ] != 0 )

          {

            if(deltaU[blkPos]>0)

            {

              curCost = - deltaU[blkPos];

              curChange=1 ;

            }

            else

            {

              //curChange =-1;

              if(n==firstNZPosInCG && abs(pQCoef[blkPos])==1)

              {

                curCost = std::numeric_limits<TCoeff>::max();

              }

              else

              {

                curCost = deltaU[blkPos];

                curChange =-1;

              }

            }

          }

          else

          {

            if(n<firstNZPosInCG)

            {

              uint32_t thisSignBit = (pCoef[blkPos]>=0?0:1);

              if(thisSignBit != signbit )

              {

                curCost = std::numeric_limits<TCoeff>::max();

              }

              else

              {

                curCost = - (deltaU[blkPos])  ;

                curChange = 1 ;

              }

            }

            else

            {

              curCost = - (deltaU[blkPos])  ;

              curChange = 1 ;

            }

          }

          if( curCost<minCostInc)

          {

            minCostInc = curCost ;

            finalChange = curChange ;

            minPos = blkPos;

            minScanPos = n + subPos;

          }

        } //CG loop

        if(pQCoef[minPos] == entropyCodingMaximum || pQCoef[minPos] == entropyCodingMinimum)

        {

          finalChange = -1;

        }

        if(pCoef[minPos]>=0)

        {

          pQCoef[minPos] += finalChange ;

        }

        else

        {

          pQCoef[minPos] -= finalChange ;

        }

        // if changing lastScanPos element to 0, move the pointer to the new lastScanPos element

        if( minScanPos == lastScanPos && pQCoef[minPos] == 0 )

        {

          for( ; lastScanPos >= 0 && pQCoef[cctx.blockPos( lastScanPos )] == 0; lastScanPos-- );

        }

        else if( minScanPos > lastScanPos && pQCoef[minPos] != 0 )

        {

          lastScanPos = minPos;

        }

      } // Hide

    }

    if(lastCG==1)

    {

      lastCG=0 ;

    }

  } // TU loop

  return;

}

void Quant::dequant(const TransformUnit& tu,

                          CoeffBuf&      dstCoeff,

                    const ComponentID    compID,

                    const QpParam&       cQP)

{

  const SPS       *sps                  = tu.cs->sps;

  const CompArea  &area                 = tu.blocks[compID];

  const uint32_t  uiWidth               = area.width;

  const uint32_t  uiHeight              = area.height;

  TCoeff *const   piCoef                = dstCoeff.buf;

  const uint32_t  numSamplesInBlock     = uiWidth * uiHeight;

  const int       maxLog2TrDynamicRange = sps->getMaxLog2TrDynamicRange();

  const TCoeff    transformMinimum      = -(1 << maxLog2TrDynamicRange);

  const TCoeff    transformMaximum      =  (1 << maxLog2TrDynamicRange) - 1;

  const bool      isTransformSkip       = tu.mtsIdx[compID] == MTS_SKIP;

  const bool      isLfnstApplied        = tu.cu->lfnstIdx > 0 && (CU::isSepTree(*tu.cu) ? true : isLuma(compID));

  const bool      enableScalingLists    = getUseScalingList(uiWidth, uiHeight, isTransformSkip, isLfnstApplied);

  const int       scalingListType       = getScalingListType(tu.cu->predMode, compID);

  const int       channelBitDepth       = sps->bitDepths[toChannelType(compID)];

  const TCoeffSig *coef     = tu.getCoeffs( compID ).buf;

  const ptrdiff_t  piStride = tu.getCoeffs( compID ).stride;

  if( tu.cu->bdpcmM[toChannelType( compID )] )

  {

    CoeffSigBuf coefBuf( m_tmpBdpcm, uiWidth, uiHeight );

    invResDPCM( tu, compID, coefBuf );

    coef      = m_tmpBdpcm;

  }

  const TCoeffSig  *const piQCoef = coef;

  CHECK(scalingListType >= SCALING_LIST_NUM, "Invalid scaling list");

  // Represents scaling through forward transform

  const int  originalTransformShift = getTransformShift(channelBitDepth, area.size(), maxLog2TrDynamicRange);

  const bool needSqrtAdjustment     = TU::needsSqrt2Scale( tu, compID );

  const int  iTransformShift        = originalTransformShift + (needSqrtAdjustment?-1:0);

  const int QP_per = cQP.per(isTransformSkip);

  const int QP_rem = cQP.rem(isTransformSkip);

  const int  rightShift = (IQUANT_SHIFT - ((isTransformSkip ? 0 : iTransformShift) + QP_per)) + (enableScalingLists ? LOG2_SCALING_LIST_NEUTRAL_VALUE : 0);

  if(enableScalingLists)

  {

    //from the dequantization equation:

    //iCoeffQ                         = ((Intermediate_Int(clipQCoef) * piDequantCoef[deQuantIdx]) + iAdd ) >> rightShift

    //(sizeof(Intermediate_Int) * 8)  =              inputBitDepth    +    dequantCoefBits                   - rightShift

    const uint32_t             dequantCoefBits     = 1 + IQUANT_SHIFT + SCALING_LIST_BITS;

    const uint32_t             targetInputBitDepth = std::min<uint32_t>((maxLog2TrDynamicRange + 1), (((sizeof(Intermediate_Int) * 8) + rightShift) - dequantCoefBits));

    const Intermediate_Int inputMinimum        = -(1 << (targetInputBitDepth - 1));

    const Intermediate_Int inputMaximum        =  (1 << (targetInputBitDepth - 1)) - 1;

    const uint32_t uiLog2TrWidth  = Log2(uiWidth);

    const uint32_t uiLog2TrHeight = Log2(uiHeight);

    int* piDequantCoef            = getDequantCoeff(scalingListType, QP_rem, uiLog2TrWidth, uiLog2TrHeight);

    if(rightShift > 0)

    {

      const Intermediate_Int iAdd = (Intermediate_Int) 1 << (rightShift - 1);

      for( int n = 0; n < numSamplesInBlock; n++ )

      {

        const TCoeff           clipQCoef = TCoeff(Clip3<Intermediate_Int>(inputMinimum, inputMaximum, piQCoef[n]));

        const Intermediate_Int iCoeffQ   = ((Intermediate_Int(clipQCoef) * piDequantCoef[n]) + iAdd ) >> rightShift;

        piCoef[n] = TCoeff(Clip3<Intermediate_Int>(transformMinimum,transformMaximum,iCoeffQ));

      }

    }

    else

    {

      const int leftShift = -rightShift;

      for( int n = 0; n < numSamplesInBlock; n++ )

      {

        const TCoeff           clipQCoef = TCoeff(Clip3<Intermediate_Int>(inputMinimum, inputMaximum, piQCoef[n]));

        const Intermediate_Int iCoeffQ   = (Intermediate_Int(clipQCoef) * piDequantCoef[n]) << leftShift;

        piCoef[n] = TCoeff(Clip3<Intermediate_Int>(transformMinimum,transformMaximum,iCoeffQ));

      }

    }

  }

  else

  {

    const int scale     = g_invQuantScales[needSqrtAdjustment?1:0][QP_rem];

    const int scaleBits = ( IQUANT_SHIFT + 1 );

    //from the dequantisation equation:

    //iCoeffQ                         = Intermediate_Int((int64_t(clipQCoef) * scale + iAdd) >> rightShift);

    //(sizeof(Intermediate_Int) * 8)  =                    inputBitDepth   + scaleBits      - rightShift

    const uint32_t             targetInputBitDepth = std::min<uint32_t>((maxLog2TrDynamicRange + 1), (((sizeof(Intermediate_Int) * 8) + rightShift) - scaleBits));

    const Intermediate_Int inputMaximum        =  (1 << (targetInputBitDepth - 1)) - 1;

    xDeQuant(uiWidth-1,uiHeight-1,scale,piQCoef,piStride,piCoef,rightShift,inputMaximum,transformMaximum);

  }

}

void Quant::init( int rdoq, bool bUseRDOQTS, int thrVal )

{

  // TODO: pass to init() a single variable containing (quantization) flags,

  //       instead of variables that don't have to do with this class

  m_RDOQ             = rdoq;

  m_useRDOQTS        = bUseRDOQTS;

  m_thrVal           = thrVal;

}

/** set flat matrix value to quantized coefficient

 */

void Quant::setFlatScalingList(const int maxLog2TrDynamicRange[MAX_NUM_CH], const BitDepths &bitDepths )

{

  if( !m_scalingListEnabled ) return;

  const int minimumQp = 0;

  const int maximumQp = SCALING_LIST_REM_NUM;

  for(uint32_t sizeX = 0; sizeX < SCALING_LIST_SIZE_NUM; sizeX++)

  {

    for(uint32_t sizeY = 0; sizeY < SCALING_LIST_SIZE_NUM; sizeY++)

    {

      for(uint32_t list = 0; list < SCALING_LIST_NUM; list++)

      {

        for(int qp = minimumQp; qp < maximumQp; qp++)

        {

          xSetFlatScalingList( list, sizeX, sizeY, qp );

        }

      }

    }

  }

}

/** set flat matrix value to quantized coefficient

 * \param list List ID

 * \param size size index

 * \param qp Quantization parameter

 * \param format chroma format

 */

void Quant::xSetFlatScalingList(uint32_t list, uint32_t sizeX, uint32_t sizeY, int qp )

{

  uint32_t i,num = g_scalingListSizeX[sizeX]*g_scalingListSizeX[sizeY];

  int *quantcoeff;

  int *dequantcoeff;

  const bool blockIsNotPowerOf4 = ((Log2(g_scalingListSizeX[sizeX] * g_scalingListSizeX[sizeY])) & 1) == 1;

  int quantScales    = g_quantScales   [blockIsNotPowerOf4?1:0][qp];

  int invQuantScales = g_invQuantScales[blockIsNotPowerOf4?1:0][qp] << 4;

  quantcoeff   = getQuantCoeff(list, qp, sizeX, sizeY);

  dequantcoeff = getDequantCoeff(list, qp, sizeX, sizeY);

  for(i=0;i<num;i++)

  {

    *quantcoeff++ = quantScales;

    *dequantcoeff++ = invQuantScales;

  }

}

/** initialization process of scaling list array

 */

void Quant::xInitScalingList( const Quant* other, bool useScalingLists )

{

  m_isScalingListOwner = other == nullptr;

  m_scalingListEnabled = useScalingLists;

  for(uint32_t sizeIdX = 0; sizeIdX < SCALING_LIST_SIZE_NUM; sizeIdX++)

  {

    for(uint32_t sizeIdY = 0; sizeIdY < SCALING_LIST_SIZE_NUM; sizeIdY++)

    {

      for(uint32_t qp = 0; qp < SCALING_LIST_REM_NUM; qp++)

      {

        for(uint32_t listId = 0; listId < SCALING_LIST_NUM; listId++)

        {

          if( m_isScalingListOwner )

          {

            const size_t scalingListSize = g_scalingListSizeX[sizeIdX] * g_scalingListSizeX[sizeIdY];

            m_quantCoef   [sizeIdX][sizeIdY][listId][qp] = useScalingLists ? new int[scalingListSize] : nullptr;

            m_dequantCoef [sizeIdX][sizeIdY][listId][qp] = useScalingLists ? new int[scalingListSize] : nullptr;

          }

          else

          {

            m_quantCoef   [sizeIdX][sizeIdY][listId][qp] = other->m_quantCoef   [sizeIdX][sizeIdY][listId][qp];

            m_dequantCoef [sizeIdX][sizeIdY][listId][qp] = other->m_dequantCoef [sizeIdX][sizeIdY][listId][qp];

          }

        } // listID loop

      }

    }

  }

}

/** destroy quantization matrix array

 */

void Quant::xDestroyScalingList()

{

  if( !m_isScalingListOwner ) return;

  for(uint32_t sizeIdX = 0; sizeIdX < SCALING_LIST_SIZE_NUM; sizeIdX++)

  {

    for(uint32_t sizeIdY = 0; sizeIdY < SCALING_LIST_SIZE_NUM; sizeIdY++)

    {

      for(uint32_t listId = 0; listId < SCALING_LIST_NUM; listId++)

      {

        for(uint32_t qp = 0; qp < SCALING_LIST_REM_NUM; qp++)

        {

          if(m_quantCoef[sizeIdX][sizeIdY][listId][qp])

          {

            delete [] m_quantCoef[sizeIdX][sizeIdY][listId][qp];

          }

          if(m_dequantCoef[sizeIdX][sizeIdY][listId][qp])

          {

            delete [] m_dequantCoef[sizeIdX][sizeIdY][listId][qp];

          }

        }

      }

    }

  }

}

void Quant::quant(TransformUnit& tu, const ComponentID compID, const CCoeffBuf& pSrc, TCoeff &uiAbsSum, const QpParam& cQP, const Ctx& ctx)

{

  const SPS &sps            = *tu.cs->sps;

  const CompArea& rect      = tu.blocks[compID];

  const uint32_t uiWidth    = rect.width;

  const uint32_t uiHeight   = rect.height;

  const int channelBitDepth = sps.bitDepths[toChannelType(compID)];

  const CCoeffBuf&  piCoef  = pSrc;

        CoeffSigBuf piQCoef = tu.getCoeffs(compID);

  const bool useTransformSkip = tu.mtsIdx[compID] == MTS_SKIP;

  const int  maxLog2TrDynamicRange = sps.getMaxLog2TrDynamicRange();

  {

    CoeffCodingContext cctx(tu, compID, tu.cs->slice->signDataHidingEnabled);

    const TCoeff entropyCodingMinimum = -(1 << maxLog2TrDynamicRange);

    const TCoeff entropyCodingMaximum =  (1 << maxLog2TrDynamicRange) - 1;

    TCoeff deltaU[MAX_TB_SIZEY * MAX_TB_SIZEY];

    int scalingListType           = getScalingListType(tu.cu->predMode, compID);

    CHECK(scalingListType >= SCALING_LIST_NUM, "Invalid scaling list");

    const uint32_t uiLog2TrWidth  = Log2(uiWidth);

    const uint32_t uiLog2TrHeight = Log2(uiHeight);

    int *piQuantCoeff             = getQuantCoeff(scalingListType, cQP.rem(useTransformSkip), uiLog2TrWidth, uiLog2TrHeight);

    const bool isLfnstApplied     = tu.cu->lfnstIdx > 0 && (CU::isSepTree(*tu.cu) ? true : isLuma(compID));

    const bool enableScalingLists = getUseScalingList(uiWidth, uiHeight, useTransformSkip, isLfnstApplied);

    // for blocks that where width*height != 4^N, the effective scaling applied during transformation cannot be

    // compensated by a bit-shift (the quantised result will be sqrt(2) * larger than required).

    // The quantScale table and shift is used to compensate for this.

    const bool needSqrtAdjustment= TU::needsSqrt2Scale( tu, compID );

    const int defaultQuantisationCoefficient    = g_quantScales[needSqrtAdjustment?1:0][cQP.rem(useTransformSkip)];

    const int iTransformShift = getTransformShift(channelBitDepth, rect.size(), maxLog2TrDynamicRange) + ( needSqrtAdjustment?-1:0);

    const int iQBits = QUANT_SHIFT + cQP.per(useTransformSkip) + (useTransformSkip ? 0 : iTransformShift);

    // QBits will be OK for any internal bit depth as the reduction in transform shift is balanced by an increase in Qp_per due to QpBDOffset

    const int64_t iAdd = int64_t(tu.cs->slice->isIRAP() ? 171 : 85) << int64_t(iQBits - 9);

    const int qBits8 = iQBits - 8;

    int lastScanPos = -1;

    if (!enableScalingLists)

      xQuant(tu,compID,piCoef,piQCoef,uiAbsSum,lastScanPos,deltaU,defaultQuantisationCoefficient,iQBits,iAdd,entropyCodingMinimum,entropyCodingMaximum,cctx.signHiding(),m_thrVal);

    else

    {

      const uint32_t lfnstIdx = tu.cu->lfnstIdx;

      const int maxNumberOfCoeffs = lfnstIdx > 0 ? ( ( ( uiWidth == 4 && uiHeight == 4 ) || ( uiWidth == 8 && uiHeight == 8 ) ) ? 8 : 16 ) : piQCoef.area();

      piQCoef.memset( 0 );

      for (int uiScanPos = 0; uiScanPos < maxNumberOfCoeffs; uiScanPos++ )

      {

        const int uiBlockPos  = cctx.blockPos( uiScanPos );

        const TCoeff iLevel   = piCoef.buf[uiBlockPos];

        const TCoeff iSign    = (iLevel < 0 ? -1: 1);

        const int64_t  tmpLevel = (int64_t)abs(iLevel) * (enableScalingLists ? piQuantCoeff[uiBlockPos] : defaultQuantisationCoefficient);

        const TCoeff quantisedMagnitude = TCoeff((tmpLevel + iAdd ) >> iQBits);

        deltaU[uiBlockPos] = (TCoeff)((tmpLevel - ((int64_t)quantisedMagnitude<<iQBits) )>> qBits8);

        uiAbsSum += quantisedMagnitude;

        const TCoeff quantisedCoefficient = quantisedMagnitude * iSign;

        piQCoef.buf[uiBlockPos] = Clip3<TCoeff>( entropyCodingMinimum, entropyCodingMaximum, quantisedCoefficient );

      } // for n

    }

    if (tu.cu->bdpcmM[toChannelType(compID)])

    {

      fwdResDPCM( tu, compID );

    }

    if( uiAbsSum )

    {

      for( int scanPos = lastScanPos; scanPos >= 0; scanPos-- )

      {

        unsigned blkPos = cctx.blockPos( scanPos );

        if( piQCoef.buf[blkPos] )

        {

          lastScanPos = scanPos;

          break;

        }

      }

      if( cctx.signHiding() )

      {

        if( uiAbsSum >= 2 ) //this prevents TUs with only one coefficient of value 1 from being tested

        {

          xSignBitHidingHDQ( piQCoef.buf, piCoef.buf, deltaU, cctx, lastScanPos, maxLog2TrDynamicRange );

        }

      }

    }

    tu.lastPos[compID] = lastScanPos;

  } //if RDOQ

  //return;

}

bool Quant::xNeedRDOQ(TransformUnit& tu, const ComponentID compID, const CCoeffBuf& pSrc, const QpParam& cQP)

{

  const SPS &sps            = *tu.cs->sps;

  const CompArea& rect      = tu.blocks[compID];

  const uint32_t uiWidth    = rect.width;

  const uint32_t uiHeight   = rect.height;

  const uint32_t efHeight   = std::min<unsigned>( uiHeight, JVET_C0024_ZERO_OUT_TH );

  const uint32_t efArea     = uiWidth * efHeight;

  const int channelBitDepth = sps.bitDepths[toChannelType(compID)];

  const CCoeffBuf piCoef    = pSrc;

  const bool useTransformSkip      = tu.mtsIdx[compID] == MTS_SKIP;

  const int  maxLog2TrDynamicRange = sps.getMaxLog2TrDynamicRange();

  const int scalingListType     = getScalingListType( tu.cu->predMode, compID );

  CHECK( scalingListType >= SCALING_LIST_NUM, "Invalid scaling list" );

  const bool        isDq        = tu.cs->slice->depQuantEnabled && !useTransformSkip;

  const int         qpDQ        = isDq ? cQP.Qp( false ) + 1 : cQP.Qp( useTransformSkip );

  const int         qpPer       = isDq ? qpDQ / 6 : cQP.per( useTransformSkip );

  const int         qpRem       = isDq ? qpDQ - 6 * qpPer : cQP.rem( useTransformSkip );

  const uint32_t uiLog2TrWidth  = Log2( uiWidth );

  const uint32_t uiLog2TrHeight = Log2( uiHeight );

  int *piQuantCoeff             = getQuantCoeff( scalingListType, qpRem, uiLog2TrWidth, uiLog2TrHeight );

  const bool isLfnstApplied     = tu.cu->lfnstIdx > 0 && ( CU::isSepTree( *tu.cu ) ? true : isLuma( compID ) );