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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>

namespace vvdec

{

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

// QpParam constructor

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

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

{

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

  const int         qpBdOffset = sps.getQpBDOffset();

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

  const ComponentID jCbCr      = useJQP ? JOINT_CbCr : compID;

  int baseQp;

  int qpy        = tu.cu->qp;

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

  if( isLuma( compID ) )

  {

    baseQp = qpy + qpBdOffset;

  }

  else

  {

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

    int

    chromaQpOffset  = pps.getQpOffset                    ( jCbCr );

    chromaQpOffset += tu.cu->slice->getSliceChromaQpDelta( jCbCr );

    chromaQpOffset += pps.getChromaQpOffsetListEntry( tu.cu->chromaQpAdj ).get( jCbCr );

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

    baseQp  = sps.getMappedChromaQpValue( jCbCr, qpi );

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

  }

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

  {

    baseQp += DELTA_QP_ACT[jCbCr];

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

  }

  // TODO: ensure clip not needed for non-ACT

  //if( !skip )

  {

    Qps [0] = baseQp;

    pers[0] = baseQp / 6;

    rems[0] = baseQp - ( pers[0] << 2 ) - ( pers[0] << 1 );

  }

  //else

  {

    int internalMinusInputBitDepth = sps.getInternalMinusInputBitDepth();

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

    Qps [1] = baseQpTS;

    pers[1] = baseQpTS / 6;

    rems[1] = baseQpTS - ( pers[1] << 2 ) - ( pers[1] << 1 );;

  }

}

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

// Quant class member functions

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

template<class T, bool UseScalingList>

static void DeQuantImpl( const SizeType width,

                         const int      maxX,

                         const int      maxY,

                         const int      scaleQP,

                         const int*     piDequantCoef,   // unused if UseScalingList == false

                         const T* 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; y <= maxY; y++ )

    {

      int n = y * width;

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

      {

        const TCoeff level = piQCoef[x + y * piQCfStride];

        if( level )

        {

          const int        scale     = UseScalingList ? piDequantCoef[n] * scaleQP   //

                                                      : scaleQP;

          const TCoeff     clipQCoef = TCoeff( Clip3<Intermediate_Int>( inputMinimum, inputMaximum, level ) );

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

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

        }

      }

    }

  }

  else   // rightshift <= 0

  {

    const int leftShift = -rightShift;

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

    {

      int n = y * width;

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

      {

        const TCoeff level = piQCoef[x + y * piQCfStride];

        if( level )

        {

          const int              scale     = UseScalingList ? piDequantCoef[n] * scaleQP   //

                                                            : scaleQP;

          const TCoeff           clipQCoef = TCoeff( Clip3<Intermediate_Int>( inputMinimum, inputMaximum, level ) );

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

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

        }

      }

    }

  }

}

Unexecuted instantiation: Quant.cpp:void vvdec::DeQuantImpl<short, false>(unsigned int, int, int, int, int const*, short const*, unsigned long, int*, int, int, int)

Unexecuted instantiation: Quant.cpp:void vvdec::DeQuantImpl<int, false>(unsigned int, int, int, int, int const*, int const*, unsigned long, int*, int, int, int)

Unexecuted instantiation: Quant.cpp:void vvdec::DeQuantImpl<short, true>(unsigned int, int, int, int, int const*, short const*, unsigned long, int*, int, int, int)

Unexecuted instantiation: Quant.cpp:void vvdec::DeQuantImpl<int, true>(unsigned int, int, int, int, int const*, int const*, unsigned long, int*, int, int, int)

template<class T>

void Quant::DeQuantScalingCore( const SizeType width,

                                const int      maxX,

                                const int      maxY,

                                const int      scaleQP,

                                const int*     piDequantCoef,

                                const T* const piQCoef,

                                const size_t   piQCfStride,

                                TCoeff* const  piCoef,

                                const int      rightShift,

                                const int      inputMaximum,

                                const TCoeff   transformMaximum )

{

  DeQuantImpl<T, true>( width, maxX, maxY, scaleQP, piDequantCoef, piQCoef, piQCfStride, piCoef, rightShift, inputMaximum, transformMaximum );

}

Unexecuted instantiation: void vvdec::Quant::DeQuantScalingCore<short>(unsigned int, int, int, int, int const*, short const*, unsigned long, int*, int, int, int)

Unexecuted instantiation: void vvdec::Quant::DeQuantScalingCore<int>(unsigned int, int, int, int, int const*, int const*, unsigned long, int*, int, int, int)

template<class T>

void Quant::DeQuantCore( const SizeType width,

                         const int      maxX,

                         const int      maxY,

                         const int      scale,

                         const T* const piQCoef,

                         const size_t   piQCfStride,

                         TCoeff* const  piCoef,

                         const int      rightShift,

                         const int      inputMaximum,

                         const TCoeff   transformMaximum )

{

  DeQuantImpl<T, false>( width, maxX, maxY, scale, nullptr, piQCoef, piQCfStride, piCoef, rightShift, inputMaximum, transformMaximum );

}

Unexecuted instantiation: void vvdec::Quant::DeQuantCore<short>(unsigned int, int, int, int, short const*, unsigned long, int*, int, int, int)

Unexecuted instantiation: void vvdec::Quant::DeQuantCore<int>(unsigned int, int, int, int, int const*, unsigned long, int*, int, int, int)

Quant::Quant( const Quant* other, bool enableOpt )

  : m_dequantCoefBuf( nullptr )

  , m_ownDequantCoeff( false )

{

  xInitScalingList( other );

  DeQuant           = DeQuantCore<TCoeffSig>;

  DeQuantPCM        = DeQuantCore<TCoeff>;

  DeQuantScaling    = DeQuantScalingCore<TCoeffSig>;

  DeQuantScalingPCM = DeQuantScalingCore<TCoeff>;

  if( enableOpt )

  {

#if ENABLE_SIMD_OPT_QUANT && defined( TARGET_SIMD_X86 )

    initQuantX86();

#endif

  }

}

Quant::~Quant()

{

  xDestroyScalingList();

}

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

{

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

  const int          wdt    = rect.width;

  const int          hgt    = rect.height;

  const CCoeffSigBuf coeffs = tu.cu->cs->getRecoBuf( tu.block( compID ) );

  const int    maxLog2TrDynamicRange = tu.cu->sps->getMaxLog2TrDynamicRange(toChannelType(compID));

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

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

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

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

  if( isLuma( compID ) ? tu.cu->bdpcmMode() == 1 : tu.cu->bdpcmModeChroma() == 1 )

  {

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

    {

      dst[0] = coef[0];

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

      {

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

      }

      coef += coeffs.stride;

      dst += dstBuf.stride;

    }

  }

}

static inline int getTransformShift( const int channelBitDepth, const Size size, const int maxLog2TrDynamicRange )

{

  return maxLog2TrDynamicRange - channelBitDepth - ( ( getLog2( size.width ) + getLog2( size.height ) ) >> 1 );

}

static inline int getScalingListType( const PredMode predMode, const ComponentID compID )

{

  return ( predMode == MODE_INTRA ? 0 : MAX_NUM_COMPONENT ) + compID;

}

void Quant::dequant( const TransformUnit& tu, CoeffBuf& dstCoeff, const ComponentID& compID, const QpParam& cQP )

{

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

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

  const CCoeffSigBuf     coeffBuf              = tu.cu->cs->getRecoBuf( tu.block( compID ) );

  const TCoeffSig* const piQCoef               = coeffBuf.buf;

  const size_t           piQCfStride           = coeffBuf.stride;

        TCoeff* const    piCoef                = dstCoeff.buf;

  const int              maxLog2TrDynamicRange = sps->getMaxLog2TrDynamicRange( toChannelType( compID ) );

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

  const bool             isTransformSkip       = ( tu.mtsIdx( compID ) == MTS_SKIP );

  setUseScalingList( tu.cu->slice->getExplicitScalingListUsed() );

  const bool             disableSMForLFNST     = tu.cu->slice->getExplicitScalingListUsed() ? sps->getDisableScalingMatrixForLfnstBlks() : false;

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

  const bool             disableSMForACT       = tu.cu->sps->getScalingMatrixForAlternativeColourSpaceDisabledFlag() && tu.cu->sps->getScalingMatrixDesignatedColourSpaceFlag() == tu.cu->colorTransform();

  const bool             enableScalingLists    = getUseScalingList( isTransformSkip, isLfnstApplied, disableSMForLFNST, disableSMForACT );

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

  const int              channelBitDepth       = sps->getBitDepth();

  int maxX, maxY;

  if( ( tu.cu->bdpcmMode() && isLuma(compID) ) || ( tu.cu->bdpcmModeChroma() && isChroma(compID) ) )

  {

    invResDPCM( tu, compID, dstCoeff );

    maxX = area.width - 1;

    maxY = area.height - 1;

  }

  else

  {

    maxX = tu.maxScanPosX[compID];

    maxY = tu.maxScanPosY[compID];

  }

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

  // Represents scaling through forward transform

  const bool bClipTransformShiftTo0 = false;   // tu.mtsIdx[compID] != 1 && sps->getSpsRangeExtension().getExtendedPrecisionProcessingFlag();

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

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

  const int  iTransformShift        = ( bClipTransformShiftTo0 ? std::max<int>( 0, originalTransformShift ) : originalTransformShift )   //

                                      + ( needSqrtAdjustment ? -1 : 0 );

  const bool depQuant   = tu.cu->slice->getDepQuantEnabledFlag() && ( tu.mtsIdx( compID ) != MTS_SKIP );

  const int  QP_per     = depQuant ? ( ( cQP.Qp( isTransformSkip ) + 1 ) / 6 ) : cQP.per( isTransformSkip );

  const int  QP_rem     = depQuant ? ( cQP.Qp( isTransformSkip ) + 1 - 6 * QP_per ) : cQP.rem( isTransformSkip );

  const int  rightShift = IQUANT_SHIFT + ( depQuant ? 1 : 0 )                       //

                         - ( ( isTransformSkip ? 0 : iTransformShift ) + QP_per )   //

                         + ( enableScalingLists ? LOG2_SCALING_LIST_NEUTRAL_VALUE : 0 );

  const int scaleQP   = 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;

  if( !enableScalingLists )

  {

    if( ( tu.cu->bdpcmMode() && isLuma( compID ) ) || ( tu.cu->bdpcmModeChroma() && isChroma( compID ) ) )

    {

      TCoeff* dst = &dstCoeff.buf[0];

      DeQuantPCM( area.width, maxX, maxY, scaleQP, dst, dstCoeff.stride, piCoef, rightShift, inputMaximum, transformMaximum );

    }

    else

    {

      DeQuant( area.width, maxX, maxY, scaleQP, piQCoef, piQCfStride, piCoef, rightShift, inputMaximum, transformMaximum );

    }

  }

  else   // Scaling Lists

  {

    const uint32_t uiLog2TrWidth  = getLog2( area.width );

    const uint32_t uiLog2TrHeight = getLog2( area.height );

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

    if( ( tu.cu->bdpcmMode() && isLuma( compID ) ) || ( tu.cu->bdpcmModeChroma() && isChroma( compID ) ) )

    {

      TCoeff* dst = &dstCoeff.buf[0];

      DeQuantScalingPCM( area.width, maxX, maxY, scaleQP, piDequantCoef, dst, dstCoeff.stride, piCoef, rightShift, inputMaximum, transformMaximum );

    }

    else

    {

      DeQuantScaling( area.width, maxX, maxY, scaleQP, piDequantCoef, piQCoef, piQCfStride, piCoef, rightShift, inputMaximum, transformMaximum );

    }

  }

}

/** set quantized matrix coefficient for decode

 * \param scalingList quantized matrix address

 * \param format      chroma format

 */

void Quant::setScalingListDec( const ScalingList& scalingList )

{

  int scalingListId    = 0;

  int recScalingListId = 0;

  bool anyChange = false;

  for( uint32_t size = SCALING_LIST_FIRST_CODED; size <= SCALING_LIST_LAST_CODED; size++ )

  {

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

    {

      if( size == SCALING_LIST_2x2 && list < 4 )   // skip 2x2 luma

      {

        continue;

      }

      scalingListId = g_scalingListId[size][list];

      anyChange |= xSetScalingListDec( scalingList, list, size, scalingListId );

    }

  }

  if( !anyChange ) return;

  // based on square result and apply downsample technology

  for( uint32_t sizew = 0; sizew <= SCALING_LIST_LAST_CODED; sizew++ )   // 7

  {

    for( uint32_t sizeh = 0; sizeh <= SCALING_LIST_LAST_CODED; sizeh++ )   // 7

    {

      if( sizew == sizeh || ( sizew == SCALING_LIST_1x1 && sizeh < SCALING_LIST_4x4 ) || ( sizeh == SCALING_LIST_1x1 && sizew < SCALING_LIST_4x4 ) )

      {

        continue;

      }

      for( uint32_t list = 0; list < SCALING_LIST_NUM; list++ )   // 9

      {

        int largerSide = ( sizew > sizeh ) ? sizew : sizeh;

        CHECK( largerSide < SCALING_LIST_4x4, "Rectangle Error!" );

        recScalingListId = g_scalingListId[largerSide][list];

        xSetRecScalingListDec( scalingList, list, sizew, sizeh, recScalingListId );

      }

    }

  }

}

/** set quantized matrix coefficient for decode

 * \param scalingList quantaized matrix address

 * \param listId List index

 * \param sizeId size index

 * \param qp Quantization parameter

 * \param format chroma format

 */

bool Quant::xSetScalingListDec(const ScalingList &scalingList, uint32_t listId, uint32_t sizeId, uint32_t scalingListId)

{

  const uint32_t width  = g_vvcScalingListSizeX[sizeId];

  const uint32_t height = g_vvcScalingListSizeX[sizeId];

#if defined( __SANITIZE_ADDRESS__ )   // work around a bug in GCC address-sanitizer, when building with -fsanitize=address, but without -fsanitize=undefined

  volatile

#endif

  const uint32_t ratio  = g_vvcScalingListSizeX[sizeId]/std::min(MAX_MATRIX_SIZE_NUM,(int)g_vvcScalingListSizeX[sizeId]);

  const int *coeff = scalingList.getScalingListAddress(scalingListId);

  int *dequantcoeff = getDequantCoeff(listId, sizeId, sizeId);

  return

  processScalingListDec(coeff,

                        dequantcoeff,

                        height, width, ratio,

                        std::min(MAX_MATRIX_SIZE_NUM, (int)g_vvcScalingListSizeX[sizeId]),

                        scalingList.getScalingListDC(scalingListId));

}

/** set quantized matrix coefficient for decode

* \param scalingList quantaized matrix address

* \param listId List index

* \param sizeId size index

* \param qp Quantization parameter

* \param format chroma format

*/

void Quant::xSetRecScalingListDec(const ScalingList &scalingList, uint32_t listId, uint32_t sizeIdw, uint32_t sizeIdh, uint32_t scalingListId)

{

  if (sizeIdw == sizeIdh) return;

  const uint32_t width  = g_vvcScalingListSizeX[sizeIdw];

  const uint32_t height = g_vvcScalingListSizeX[sizeIdh];

  const uint32_t largeSideId = (sizeIdw > sizeIdh) ? sizeIdw : sizeIdh;  //16

  const int *coeff = scalingList.getScalingListAddress(scalingListId);

  int *dequantcoeff = getDequantCoeff(listId, sizeIdw, sizeIdh);

  processScalingListDec(coeff,

                        dequantcoeff,

                        height, width, (largeSideId>3) ? 2 : 1,

                        (largeSideId >= 3 ? 8 : 4),

                        scalingList.getScalingListDC(scalingListId));

}

/** set quantized matrix coefficient for decode

 * \param coeff quantaized matrix address

 * \param dequantcoeff quantaized matrix address

 * \param invQuantScales IQ(QP%6))

 * \param height height

 * \param width width

 * \param ratio ratio for upscale

 * \param sizuNum matrix size

 * \param dc dc parameter

 */

bool Quant::processScalingListDec( const int *coeff, int *dequantcoeff, uint32_t height, uint32_t width, uint32_t ratio, int sizuNum, uint32_t dc)

{

  if (height != width)

  {

    const int hl2 = getLog2( height );

    const int wl2 = getLog2( width );

    const int sl2 = getLog2( sizuNum );

    const int loopH = std::min<int>( height, JVET_C0024_ZERO_OUT_TH );

    const int loopW = std::min<int>( width,  JVET_C0024_ZERO_OUT_TH );

    const int ratioWH = height > width   ? hl2 - wl2 : wl2 - hl2;

    const int ratioH  = height / sizuNum ? hl2 - sl2 : sl2 - hl2;

    const int ratioW  = width / sizuNum  ? wl2 - sl2 : sl2 - wl2;

    if( height > width )

    {

      for( uint32_t j = 0; j < loopH; j += ( 1 << ratioH ) )

      {

        for( uint32_t i = 0; i < loopW; i++ )

        {

          dequantcoeff[j * width + i] = coeff[sizuNum * ( j >> ratioH ) + ( ( i << ratioWH ) >> ratioH )];

        }

        const int* src = &dequantcoeff[j * width];

        for( int jj = 1; jj < ( 1 << ratioH ); jj++ )

        {

          memcpy( &dequantcoeff[( j + jj ) * width], src, loopW * sizeof( int ) );

        }

      }

    }

    else

    {

      for( uint32_t j = 0; j < loopH; j++ )

      {

        for( uint32_t i = 0; i < loopW; i += ( 1 << ratioW ) )

        {

          const int coeffi = coeff[sizuNum * ( ( j << ratioWH ) >> ratioW ) + ( i >> ratioW )];

          for( uint32_t ii = 0; ii < ( 1 << ratioW ); ii++ )

          {

            dequantcoeff[j * width + i + ii] = coeffi;

          }

        }

      }

    }

    const int largeOne = std::max( width, height );

    if( largeOne > 8 )

    {

      dequantcoeff[0] = dc;

    }

    return true;

  }

  bool anyChange = false;

  const int rl2   = getLog2( ratio );

  const int loopH = std::min<int>( height, JVET_C0024_ZERO_OUT_TH );

  const int loopW = std::min<int>( width, JVET_C0024_ZERO_OUT_TH );

  for( uint32_t j = 0; j < loopH; j += ( 1 << rl2 ) )

  {

    for( uint32_t i = 0; i < loopW; i += ( 1 << rl2 ) )

    {

      const int coeffi = coeff[sizuNum * ( j >> rl2 ) + ( i >> rl2 )];

      anyChange |= coeffi != dequantcoeff[j * width + i];

      for( uint32_t ii = 0; anyChange && ii < ( 1 << rl2 ); ii++ )

      {

        dequantcoeff[j * width + i + ii] = coeffi;

      }

    }

    const int* src = &dequantcoeff[j * width];

    for( int jj = 1; jj < ( 1 << rl2 ); jj++ )

    {

      memcpy( &dequantcoeff[( j + jj ) * width], src, loopW * sizeof( int ) );

    }

  }

  if( ratio > 1 )

  {

    anyChange |= dequantcoeff[0] != dc;

    dequantcoeff[0] = dc;

  }

  return anyChange;

}

static constexpr int g_numScalingListCoeffs = 96774;

/** initialization process of scaling list array

 */

void Quant::xInitScalingList( const Quant* other )

{

  if( other )

  {

    m_dequantCoefBuf  = other->m_dequantCoefBuf;

    m_ownDequantCoeff = false;

  }

  else

  {

    const size_t numScalingCoeffAlloc = g_numScalingListCoeffs + 4;   // +4 to prevent out of bounds read in SIMD code

    m_dequantCoefBuf  = new int[numScalingCoeffAlloc];

    m_ownDequantCoeff = true;

    std::fill_n( m_dequantCoefBuf, numScalingCoeffAlloc, 0 );

  }

  size_t numQuants = 0;

  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++)

      {

        m_dequantCoef [sizeIdX][sizeIdY][listId] = &m_dequantCoefBuf[numQuants];

        numQuants += g_vvcScalingListSizeX[sizeIdX] * g_vvcScalingListSizeX[sizeIdY];

      } // listID loop

    }

  }

  CHECK( numQuants != g_numScalingListCoeffs, "Incorrect size of scaling list entries number!" );

}

/** destroy quantization matrix array

 */

void Quant::xDestroyScalingList()

{

  if( m_ownDequantCoeff )

  {

    delete[] m_dequantCoefBuf;

  }

  m_ownDequantCoeff = false;

  m_dequantCoefBuf  = nullptr;

}

void Quant::init( const Picture *pic )

{

  const Slice* scalingListSlice = nullptr;

  for( const Slice* slice : pic->slices )

  {

    if( slice->getExplicitScalingListUsed() )

    {

      scalingListSlice = slice;

      break;

    }

  }

  const Slice* slice = scalingListSlice;

  if( slice && slice->getExplicitScalingListUsed() )

  {

    const std::shared_ptr<const APS> scalingListAPS = slice->getPicHeader()->getScalingListAPS();

    if( slice->getNalUnitLayerId() != scalingListAPS->getLayerId() )

    {

      CHECK( scalingListAPS->getLayerId() > slice->getNalUnitLayerId(), "Layer Id of APS cannot be greater than layer Id of VCL NAL unit the refer to it" );

      CHECK( slice->getSPS()->getVPSId() == 0, "VPSId of the referred SPS cannot be 0 when layer Id of APS and layer Id of current slice are different" );

      for( int i = 0; i < slice->getVPS()->getNumOutputLayerSets(); i++ )

      {

        bool isCurrLayerInOls = false;

        bool isRefLayerInOls = false;

        for( int j = slice->getVPS()->getNumLayersInOls(i) - 1; j >= 0; j-- )

        {

          if( slice->getVPS()->getLayerIdInOls(i, j) == slice->getNalUnitLayerId() )

          {

            isCurrLayerInOls = true;

          }

          if( slice->getVPS()->getLayerIdInOls(i, j) == scalingListAPS->getLayerId() )

          {

            isRefLayerInOls = true;

          }

        }

        CHECK( isCurrLayerInOls && !isRefLayerInOls, "When VCL NAl unit in layer A refers to APS in layer B, all OLS that contains layer A shall also contains layer B" );

      }

    }

    const ScalingList& scalingList = scalingListAPS->getScalingList();

    if( m_ownDequantCoeff )

    {

      memset( m_dequantCoefBuf, 0, sizeof( int ) * g_numScalingListCoeffs );

      setScalingListDec( scalingList );

    }

    setUseScalingList(true);

  }

  else

  {

    setUseScalingList( false );

  }

}

}