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/** \file     EncReshape.cpp
\brief    encoder reshaper class
*/
#include "EncReshape.h"
#include <stdio.h>
#include <string.h>
#include <math.h>
//! \ingroup EncLib
//! \{

// ====================================================================================================================
// Constructor / destructor / create / destroy
// ====================================================================================================================

EncReshape::EncReshape()
{
  m_ctuFlag      = false;
  m_srcReshaped  = false;
  m_recReshaped  = false;
  m_reshape      = true;
  m_exceedSTD    = false;
  m_tcase        = 0;
  m_rateAdpMode  = 0;
  m_chromaAdj    = 0;
}

EncReshape::~EncReshape()
{
}

void  EncReshape::createEnc(int picWidth, int picHeight, uint32_t maxCUWidth, uint32_t maxCUHeight, int bitDepth)
{
  m_lumaBD = bitDepth;
  m_reshapeLUTSize = 1 << m_lumaBD;
  m_initCWAnalyze = m_reshapeLUTSize / PIC_ANALYZE_CW_BINS;
  m_initCW = m_reshapeLUTSize / PIC_CODE_CW_BINS;

  if (m_fwdLUT.empty())
  {
    m_fwdLUT.resize(m_reshapeLUTSize, 0);
  }
  if (m_invLUT.empty())
  {
    m_invLUT.resize(m_reshapeLUTSize,0);
  }
  if (m_binCW.empty())
  {
    m_binCW.resize(PIC_ANALYZE_CW_BINS);
  }
  if (m_binImportance.empty())
  {
    m_binImportance.resize(PIC_ANALYZE_CW_BINS);
  }
  if (m_reshapePivot.empty())
  {
    m_reshapePivot.resize(PIC_CODE_CW_BINS + 1, 0);
  }
  if (m_inputPivot.empty())
  {
    m_inputPivot.resize(PIC_CODE_CW_BINS + 1, 0);
  }
  if (m_fwdScaleCoef.empty())
  {
    m_fwdScaleCoef.resize(PIC_CODE_CW_BINS, 1 << FP_PREC);
  }
  if (m_invScaleCoef.empty())
  {
    m_invScaleCoef.resize(PIC_CODE_CW_BINS, 1 << FP_PREC);
  }
  if (m_chromaAdjHelpLUT.empty())
  {
    m_chromaAdjHelpLUT.resize(PIC_CODE_CW_BINS, 1<<CSCALE_FP_PREC);
  }

  m_sliceReshapeInfo.setUseSliceReshaper(true);
  m_sliceReshapeInfo.setSliceReshapeChromaAdj(true);
  m_sliceReshapeInfo.setSliceReshapeModelPresentFlag(true);
  m_sliceReshapeInfo.reshaperModelMinBinIdx = 0;
  m_sliceReshapeInfo.reshaperModelMaxBinIdx = PIC_CODE_CW_BINS - 1;
  memset(m_sliceReshapeInfo.reshaperModelBinCWDelta, 0, (PIC_CODE_CW_BINS) * sizeof(int));
  m_sliceReshapeInfo.chrResScalingOffset = 0;

  m_picWidth = picWidth;
  m_picHeight = picHeight;
  m_maxCUWidth = maxCUWidth;
  m_maxCUHeight = maxCUHeight;
  m_widthInCtus = (m_picWidth + m_maxCUWidth - 1) / m_maxCUWidth;
  m_heightInCtus = (m_picHeight + m_maxCUHeight - 1) / m_maxCUHeight;
  m_numCtuInFrame = m_widthInCtus * m_heightInCtus;
  m_binNum = PIC_CODE_CW_BINS;
  initSeqStats(m_srcSeqStats);
  initSeqStats(m_rspSeqStats);
}

void  EncReshape::destroy()
{
}

/**
-Perform HDR set up
\param   pcPic describe pointer of current coding picture
\param   sliceType describe the slice type
*/
void EncReshape::preAnalyzerHDR(Picture *pcPic, const SliceType sliceType, const ReshapeCW& reshapeCW, bool isDualT)
{
  if (m_lumaBD >= 10)
  {
    m_sliceReshapeInfo.sliceReshaperEnableFlag = true;
    if (sliceType == I_SLICE)
    {
      m_sliceReshapeInfo.sliceReshaperModelPresentFlag = true;
    }
    else
    {
      m_sliceReshapeInfo.sliceReshaperModelPresentFlag = false;
    }
    { m_sliceReshapeInfo.enableChromaAdj = 1;                   }
  }
  else
  {
    m_sliceReshapeInfo.sliceReshaperEnableFlag = false;
    m_sliceReshapeInfo.sliceReshaperModelPresentFlag = false;
  }
}

/**
-Perform picture analysis for SDR
\param   pcPic describe pointer of current coding picture
\param   sliceType describe the slice type
\param   reshapeCW describe some input info
*/
void EncReshape::initSeqStats(SeqInfo &stats)
{
  for (int i = 0; i < m_binNum; i++)
  {
    stats.binVar[i] = 0.0;
    stats.binHist[i] = 0.0;
    stats.normVar[i] = 0.0;
  }
  stats.nonZeroCnt = 0;
  stats.weightVar = 0.0;
  stats.weightNorm = 0.0;
  stats.minBinVar = 0.0;
  stats.maxBinVar = 0.0;
  stats.meanBinVar = 0.0;
  stats.ratioStdU = 0.0;
  stats.ratioStdV = 0.0;
}
void EncReshape::calcSeqStats(Picture *pcPic, SeqInfo &stats)
{
  PelBuf picY = pcPic->getOrigBuf(COMPONENT_Y);
  const int width = picY.width;
  const int height = picY.height;
  const ptrdiff_t stride  = picY.stride;
  uint32_t winLens = (m_binNum == PIC_CODE_CW_BINS) ? (std::min(height, width) / 240) : 2;
  winLens = winLens > 0 ? winLens : 1;

  int64_t tempSq = 0;
  int64_t topSum = 0, topSumSq = 0;
  int64_t leftSum = 0, leftSumSq = 0;
  int64_t *leftColSum = new int64_t[width];
  int64_t *leftColSumSq = new int64_t[width];
  int64_t *topRowSum = new int64_t[height];
  int64_t *topRowSumSq = new int64_t[height];
  int64_t *topColSum = new int64_t[width];
  int64_t *topColSumSq = new int64_t[width];
  uint32_t *binCnt = new uint32_t[m_binNum];
  memset(leftColSum, 0, width * sizeof(int64_t));
  memset(leftColSumSq, 0, width * sizeof(int64_t));
  memset(topRowSum, 0, height * sizeof(int64_t));
  memset(topRowSumSq, 0, height * sizeof(int64_t));
  memset(topColSum, 0, width * sizeof(int64_t));
  memset(topColSumSq, 0, width * sizeof(int64_t));
  memset(binCnt, 0, m_binNum * sizeof(uint32_t));

  initSeqStats(stats);
  for (uint32_t y = 0; y < height; y++)
  {
    for (uint32_t x = 0; x < width; x++)
    {
      const Pel pxlY = picY.buf[x];
      int64_t sum = 0, sumSq = 0;
      uint32_t numPixInPart = 0;
      uint32_t y1 = std::max((int)(y - winLens), 0);
      uint32_t y2 = std::min((int)(y + winLens), (height - 1));
      uint32_t x1 = std::max((int)(x - winLens), 0);
      uint32_t x2 = std::min((int)(x + winLens), (width - 1));
      uint32_t bx = 0, by = 0;
      const Pel *pWinY = &picY.buf[0];
      numPixInPart = (x2 - x1 + 1) * (y2 - y1 + 1);

      if (x == 0 && y == 0)
      {
        for (by = y1; by <= y2; by++)
        {
          for (bx = x1; bx <= x2; bx++)
          {
            tempSq = (int64_t)pWinY[bx] * (int64_t)pWinY[bx];
            leftSum += pWinY[bx];
            leftSumSq += tempSq;
            leftColSum[bx] += pWinY[bx];
            leftColSumSq[bx] += tempSq;
            topColSum[bx] += pWinY[bx];
            topColSumSq[bx] += tempSq;
            topRowSum[by] += pWinY[bx];
            topRowSumSq[by] += tempSq;
          }
          pWinY += stride;
        }
        topSum = leftSum;
        topSumSq = leftSumSq;
        sum = leftSum;
        sumSq = leftSumSq;
      }
      else if (x == 0 && y > 0)
      {
        if (y < height - winLens)
        {
          pWinY += winLens*stride;
          topRowSum[y + winLens] = 0;
          topRowSumSq[y + winLens] = 0;
          for (bx = x1; bx <= x2; bx++)
          {
            topRowSum[y + winLens] += pWinY[bx];
            topRowSumSq[y + winLens] += (int64_t)pWinY[bx] * (int64_t)pWinY[bx];
          }
          topSum += topRowSum[y + winLens];
          topSumSq += topRowSumSq[y + winLens];
        }
        if (y > winLens)
        {
          topSum -= topRowSum[y - 1 - winLens];
          topSumSq -= topRowSumSq[y - 1 - winLens];
        }
        memset(leftColSum, 0, width * sizeof(int64_t));
        memset(leftColSumSq, 0, width * sizeof(int64_t));
        pWinY = &picY.buf[0];
        pWinY -= (y <= winLens ? y : winLens)*stride;
        for (by = y1; by <= y2; by++)
        {
          for (bx = x1; bx <= x2; bx++)
          {
            leftColSum[bx] += pWinY[bx];
            leftColSumSq[bx] += (int64_t)pWinY[bx] * (int64_t)pWinY[bx];
          }
          pWinY += stride;
        }
        leftSum = topSum;
        leftSumSq = topSumSq;
        sum = topSum;
        sumSq = topSumSq;
      }
      else if (x > 0)
      {
        if (x < width - winLens)
        {
          pWinY -= (y <= winLens ? y : winLens)*stride;
          if (y == 0)
          {
            leftColSum[x + winLens] = 0;
            leftColSumSq[x + winLens] = 0;
            for (by = y1; by <= y2; by++)
            {
              leftColSum[x + winLens] += pWinY[x + winLens];
              leftColSumSq[x + winLens] += (int64_t)pWinY[x + winLens] * (int64_t)pWinY[x + winLens];
              pWinY += stride;
            }
          }
          else
          {
            leftColSum[x + winLens] = topColSum[x + winLens];
            leftColSumSq[x + winLens] = topColSumSq[x + winLens];
            if (y < height - winLens)
            {
              pWinY = &picY.buf[0];
              pWinY += winLens * stride;
              leftColSum[x + winLens] += pWinY[x + winLens];
              leftColSumSq[x + winLens] += (int64_t)pWinY[x + winLens] * (int64_t)pWinY[x + winLens];
            }
            if (y > winLens)
            {
              pWinY = &picY.buf[0];
              pWinY -= (winLens + 1) * stride;
              leftColSum[x + winLens] -= pWinY[x + winLens];
              leftColSumSq[x + winLens] -= (int64_t)pWinY[x + winLens] * (int64_t)pWinY[x + winLens];
            }
          }
          topColSum[x + winLens] = leftColSum[x + winLens];
          topColSumSq[x + winLens] = leftColSumSq[x + winLens];
          leftSum += leftColSum[x + winLens];
          leftSumSq += leftColSumSq[x + winLens];
        }
        if (x > winLens)
        {
          leftSum -= leftColSum[x - 1 - winLens];
          leftSumSq -= leftColSumSq[x - 1 - winLens];
        }
        sum = leftSum;
        sumSq = leftSumSq;
      }

      double average = double(sum) / numPixInPart;
      double variance = double(sumSq) / numPixInPart - average * average;
      int binLen = m_reshapeLUTSize / m_binNum;
      uint32_t binIdx = (uint32_t)(pxlY / binLen);
      if (m_lumaBD > 10)
      {
        average = average / (double)(1 << (m_lumaBD - 10));
        variance = variance / (double)(1 << (2 * m_lumaBD - 20));
      }
      else if (m_lumaBD < 10)
      {
        average = average * (double)(1 << (10 - m_lumaBD));
        variance = variance * (double)(1 << (20 - 2 * m_lumaBD));
      }
      double varLog10 = log10(variance + 1.0);
      stats.binVar[binIdx] += varLog10;
      binCnt[binIdx]++;
    }
    picY.buf += stride;
  }

  for (int b = 0; b < m_binNum; b++)
  {
    stats.binHist[b] = (double)binCnt[b] / (double)(m_reshapeCW.rspPicSize);
    stats.binVar[b] = (binCnt[b] > 0) ? (stats.binVar[b] / binCnt[b]) : 0.0;
  }
  delete[] binCnt;
  delete[] topColSum;
  delete[] topColSumSq;
  delete[] topRowSum;
  delete[] topRowSumSq;
  delete[] leftColSum;
  delete[] leftColSumSq;

  stats.minBinVar = 5.0;
  stats.maxBinVar = 0.0;
  stats.meanBinVar = 0.0;
  stats.nonZeroCnt = 0;
  for (int b = 0; b < m_binNum; b++)
  {
    if (stats.binHist[b] > 0.001)
    {
      stats.nonZeroCnt++;
      stats.meanBinVar += stats.binVar[b];
      if (stats.binVar[b] > stats.maxBinVar) { stats.maxBinVar = stats.binVar[b]; }
      if (stats.binVar[b] < stats.minBinVar) { stats.minBinVar = stats.binVar[b]; }
    }
  }
  stats.meanBinVar /= (double)stats.nonZeroCnt;
  for (int b = 0; b < m_binNum; b++)
  {
    if (stats.meanBinVar > 0.0)
    {
      stats.normVar[b] = stats.binVar[b] / stats.meanBinVar;
    }
    stats.weightVar += stats.binHist[b] * stats.binVar[b];
    stats.weightNorm += stats.binHist[b] * stats.normVar[b];
  }

  picY = pcPic->getOrigBuf(COMPONENT_Y);
  double avgY = 0.0;
  double varY = 0.0;
  for (int y = 0; y < height; y++)
  {
    for (int x = 0; x < width; x++)
    {
      avgY += picY.buf[x];
      varY += (double)picY.buf[x] * (double)picY.buf[x];
    }
    picY.buf += stride;
  }
  avgY = avgY / (width * height);
  varY = varY / (width * height) - avgY * avgY;

  if (isChromaEnabled(pcPic->chromaFormat))
  {
    PelBuf picU = pcPic->getOrigBuf(COMPONENT_Cb);
    PelBuf picV = pcPic->getOrigBuf(COMPONENT_Cr);
    const int widthC = picU.width;
    const int heightC = picU.height;
    const ptrdiff_t strideC = picU.stride;
    double avgU = 0.0, avgV = 0.0;
    double varU = 0.0, varV = 0.0;
    for (int y = 0; y < heightC; y++)
    {
      for (int x = 0; x < widthC; x++)
      {
        avgU += picU.buf[x];
        avgV += picV.buf[x];
        varU += (int64_t)picU.buf[x] * (int64_t)picU.buf[x];
        varV += (int64_t)picV.buf[x] * (int64_t)picV.buf[x];
      }
      picU.buf += strideC;
      picV.buf += strideC;
    }
    avgU = avgU / (widthC * heightC);
    avgV = avgV / (widthC * heightC);
    varU = varU / (widthC * heightC) - avgU * avgU;
    varV = varV / (widthC * heightC) - avgV * avgV;
    if (varY > 0)
    {
      stats.ratioStdU = sqrt(varU) / sqrt(varY);
      stats.ratioStdV = sqrt(varV) / sqrt(varY);
    }
  }
}

void EncReshape::preAnalyzerLMCS(Picture *pcPic, const uint32_t signalType, const SliceType sliceType, const ReshapeCW& reshapeCW)
{
  m_sliceReshapeInfo.sliceReshaperModelPresentFlag = true;
  m_sliceReshapeInfo.sliceReshaperEnableFlag = true;
  int modIP = pcPic->getPOC() - pcPic->getPOC() / reshapeCW.rspFpsToIp * reshapeCW.rspFpsToIp;
#if GDR_ENABLED
  if (pcPic->cs->slice->isInterGDR()) modIP = 0;
#endif
  if (sliceType == I_SLICE || (reshapeCW.updateCtrl == 2 && modIP == 0))
  {
    if (m_sliceReshapeInfo.sliceReshaperModelPresentFlag == true)
    {
      m_reshapeCW = reshapeCW;
      m_binNum = PIC_CODE_CW_BINS;
      int stdMin = 16 << (m_lumaBD - 8);
      int stdMax = 235 << (m_lumaBD - 8);
      int binLen = m_reshapeLUTSize / m_binNum;
      int startBinIdx = stdMin / binLen;
      int endBinIdx = stdMax / binLen;
      m_sliceReshapeInfo.reshaperModelMinBinIdx = startBinIdx;
      m_sliceReshapeInfo.reshaperModelMaxBinIdx = endBinIdx;
      m_initCWAnalyze = m_lumaBD > 10 ? (binLen >> (m_lumaBD - 10)) : m_lumaBD < 10 ? (binLen << (10 - m_lumaBD)) : binLen;
      for (int b = 0; b < m_binNum; b++)
      {
        m_binCW[b] = m_initCWAnalyze;
      }

      m_reshape = true;
      m_useAdpCW = false;
      m_exceedSTD = false;
      m_chromaWeight = 1.0;
      m_sliceReshapeInfo.enableChromaAdj = 1;
      m_rateAdpMode = 0;  m_tcase = 0;
      bool intraAdp = true, interAdp = true;

      calcSeqStats(pcPic, m_srcSeqStats);

      bool isFlat = true;
      for (int b = 0; b < m_binNum; b++)
      {
        if (m_srcSeqStats.binVar[b] > 0)
        {
          isFlat = false;
        }
      }
      if (isFlat)
      {
        intraAdp = false;
        interAdp = false;
      }
      if (m_binNum == PIC_CODE_CW_BINS)
      {
        if ((m_srcSeqStats.binHist[0] + m_srcSeqStats.binHist[m_binNum - 1]) > 0.005)
        {
          m_exceedSTD = true;
        }
        if (m_srcSeqStats.binHist[m_binNum - 1] > 0.0003)
        {
          intraAdp = false;
          interAdp = false;
        }
        if (m_srcSeqStats.binHist[0] > 0.03)
        {
          intraAdp = false;
          interAdp = false;
        }
      }
      else if (m_binNum == PIC_ANALYZE_CW_BINS)
      {
        if ((m_srcSeqStats.binHist[0] + m_srcSeqStats.binHist[1] + m_srcSeqStats.binHist[m_binNum - 2]
             + m_srcSeqStats.binHist[m_binNum - 1])
            > 0.01)
        {
          m_exceedSTD = true;
        }
        if ((m_srcSeqStats.binHist[m_binNum - 2] + m_srcSeqStats.binHist[m_binNum - 1]) > 0.0003)
        {
          intraAdp = false;
          interAdp = false;
        }
        if ((m_srcSeqStats.binHist[0] + m_srcSeqStats.binHist[1]) > 0.03)
        {
          intraAdp = false;
          interAdp = false;
        }
      }
      if (m_exceedSTD)
      {
        for (int i = 0; i < m_binNum; i++)
        {
          if (m_srcSeqStats.binHist[i] > 0 && i < startBinIdx)
          {
            startBinIdx = i;
          }
          if (m_srcSeqStats.binHist[i] > 0 && i > endBinIdx)
          {
            endBinIdx = i;
          }
        }
        m_sliceReshapeInfo.reshaperModelMinBinIdx = startBinIdx;
        m_sliceReshapeInfo.reshaperModelMaxBinIdx = endBinIdx;
      }

      if ((m_srcSeqStats.ratioStdU + m_srcSeqStats.ratioStdV) > 1.5 && m_srcSeqStats.binHist[1] > 0.5)
      {
        intraAdp = false;
        interAdp = false;
      }
      if (m_srcSeqStats.ratioStdU > 0.36 && m_srcSeqStats.ratioStdV > 0.2 && m_reshapeCW.rspPicSize > 5184000)
      {
        m_sliceReshapeInfo.enableChromaAdj = 0; m_chromaWeight = 1.05;
        if ((m_srcSeqStats.ratioStdU + m_srcSeqStats.ratioStdV) < 0.69)
        {
          m_chromaWeight = 0.95;
        }
      }

      if (interAdp)
      {
        if (m_reshapeCW.adpOption)
        {
          m_reshapeCW.binCW[0] = 0; m_reshapeCW.binCW[1] = m_reshapeCW.initialCW;
          m_rateAdpMode = m_reshapeCW.adpOption - 2 * (m_reshapeCW.adpOption / 2);
          if (m_reshapeCW.adpOption == 2)
          {
            m_tcase = 9;
          }
          else if (m_reshapeCW.adpOption > 2)
          {
            intraAdp = false;
          }
        }
        else if (signalType == RESHAPE_SIGNAL_SDR)
        {
          m_reshapeCW.binCW[0] = 0; m_reshapeCW.binCW[1] = 1022;
          deriveReshapeParametersSDR(&intraAdp, &interAdp);
        }
        else if (signalType == RESHAPE_SIGNAL_HLG)
        {
          if (m_reshapeCW.updateCtrl == 0)
          {
            m_rateAdpMode = 0;  m_tcase = 9;
            m_reshapeCW.binCW[1] = 952;
            if (m_srcSeqStats.meanBinVar < 2.5)
            {
              m_reshapeCW.binCW[1] = 840;
            }
          }
          else
          {
            m_useAdpCW = true;
            m_rateAdpMode = 2;
            if (m_binNum == PIC_CODE_CW_BINS)
            {
              m_reshapeCW.binCW[0] = 72;
              m_reshapeCW.binCW[1] = 58;
            }
            else if (m_binNum == PIC_ANALYZE_CW_BINS)
            {
              m_reshapeCW.binCW[0] = 36;
              m_reshapeCW.binCW[1] = 30;
            }
            if (m_srcSeqStats.meanBinVar < 2.5)
            {
              intraAdp = false;
              interAdp = false;
            }
          }
        }
      }

      if (m_rateAdpMode == 2 && reshapeCW.rspBaseQP <= 22)
      {
        intraAdp = false;
        interAdp = false;
      }
      m_sliceReshapeInfo.sliceReshaperEnableFlag = intraAdp;
      if (!intraAdp && !interAdp)
      {
        m_sliceReshapeInfo.sliceReshaperModelPresentFlag = false;
        m_reshape = false;
        return;
      }

      if (m_rateAdpMode == 1 && reshapeCW.rspBaseQP <= 22)
      {
        for (int i = 0; i < m_binNum; i++)
        {
          if (i >= startBinIdx && i <= endBinIdx)
          {
            m_binCW[i] = m_initCWAnalyze + 2;
          }
          else
          {
            m_binCW[i] = 0;
          }
        }
      }
      else if (m_useAdpCW)
      {
        if (signalType == RESHAPE_SIGNAL_SDR && m_reshapeCW.updateCtrl == 2)
        {
          m_binNum = PIC_ANALYZE_CW_BINS;
          startBinIdx = startBinIdx * 2;
          endBinIdx = endBinIdx * 2 + 1;
          calcSeqStats(pcPic, m_srcSeqStats);
        }
        double alpha = 1.0, beta = 0.0;
        deriveReshapeParameters(m_srcSeqStats.binVar, startBinIdx, endBinIdx, m_reshapeCW, alpha, beta);
        for (int i = 0; i < m_binNum; i++)
        {
          if (i >= startBinIdx && i <= endBinIdx)
          {
            m_binCW[i] = (uint32_t) round(alpha * m_srcSeqStats.binVar[i] + beta);
          }
          else
          {
            m_binCW[i] = 0;
          }
        }
      }
      else
      {
        cwPerturbation(startBinIdx, endBinIdx, (uint16_t)m_reshapeCW.binCW[1]);
      }
      cwReduction(startBinIdx, endBinIdx);
    }
    m_chromaAdj = m_sliceReshapeInfo.enableChromaAdj;
  }
  else // Inter slices
  {
    m_sliceReshapeInfo.sliceReshaperModelPresentFlag = false;
    m_sliceReshapeInfo.enableChromaAdj = m_chromaAdj;
    if (!m_reshape)
    {
      m_sliceReshapeInfo.sliceReshaperEnableFlag = false;
    }
    else
    {
      const int cTid = m_reshapeCW.rspTid;
      bool enableRsp = m_tcase == 5 ? false : (m_tcase < 5 ? (cTid < m_tcase + 1 ? false : true) : (cTid <= 10 - m_tcase ? true : false));
      m_sliceReshapeInfo.sliceReshaperEnableFlag = enableRsp;

      if (m_sliceReshapeInfo.sliceReshaperEnableFlag)
      {
        m_binNum = PIC_CODE_CW_BINS;
        PelBuf picY = pcPic->getOrigBuf(COMPONENT_Y);
        const int width = picY.width;
        const int height = picY.height;
        const ptrdiff_t stride = picY.stride;
        uint32_t binCnt[PIC_CODE_CW_BINS];
        std::fill_n(binCnt, m_binNum, 0);

        initSeqStats(m_srcSeqStats);
        for (uint32_t y = 0; y < height; y++)
        {
          for (uint32_t x = 0; x < width; x++)
          {
            const Pel pxlY = picY.buf[x];
            int binLen = m_reshapeLUTSize / m_binNum;
            uint32_t binIdx = (uint32_t)(pxlY / binLen);
            binCnt[binIdx]++;
          }
          picY.buf += stride;
        }

        for (int b = 0; b < m_binNum; b++)
        {
          m_srcSeqStats.binHist[b] = (double)binCnt[b] / (double)(m_reshapeCW.rspPicSize);
        }

        double avgY = 0.0;
        double varY = 0.0;
        picY = pcPic->getOrigBuf(COMPONENT_Y);
        for (int y = 0; y < height; y++)
        {
          for (int x = 0; x < width; x++)
          {
            avgY += picY.buf[x];
            varY += (double)picY.buf[x] * (double)picY.buf[x];
          }
          picY.buf += stride;
        }
        avgY = avgY / (width * height);
        varY = varY / (width * height) - avgY * avgY;

        if (isChromaEnabled(pcPic->chromaFormat))
        {
          PelBuf picU = pcPic->getOrigBuf(COMPONENT_Cb);
          PelBuf picV = pcPic->getOrigBuf(COMPONENT_Cr);
          const int widthC = picU.width;
          const int heightC = picU.height;
          const ptrdiff_t strideC = picU.stride;
          double avgU = 0.0, avgV = 0.0;
          double varU = 0.0, varV = 0.0;
          for (int y = 0; y < heightC; y++)
          {
            for (int x = 0; x < widthC; x++)
            {
              avgU += picU.buf[x];
              avgV += picV.buf[x];
              varU += (int64_t)picU.buf[x] * (int64_t)picU.buf[x];
              varV += (int64_t)picV.buf[x] * (int64_t)picV.buf[x];
            }
            picU.buf += strideC;
            picV.buf += strideC;
          }
          avgU = avgU / (widthC * heightC);
          avgV = avgV / (widthC * heightC);
          varU = varU / (widthC * heightC) - avgU * avgU;
          varV = varV / (widthC * heightC) - avgV * avgV;
          if (varY > 0)
          {
            m_srcSeqStats.ratioStdU = sqrt(varU) / sqrt(varY);
            m_srcSeqStats.ratioStdV = sqrt(varV) / sqrt(varY);
          }
        }

        if (m_srcSeqStats.binHist[m_binNum - 1] > 0.0003)
        {
          m_sliceReshapeInfo.sliceReshaperEnableFlag = false;
        }
        if (m_srcSeqStats.binHist[0] > 0.03)
        {
          m_sliceReshapeInfo.sliceReshaperEnableFlag = false;
        }

        if ((m_srcSeqStats.ratioStdU + m_srcSeqStats.ratioStdV) > 1.5 && m_srcSeqStats.binHist[1] > 0.5)
        {
          m_sliceReshapeInfo.sliceReshaperEnableFlag = false;
        }
      }
    }
  }
}

// Bubble Sort to  descending order with index
void EncReshape::bubbleSortDsd(double* array, int * idx, int n)
{
  int i, j;
  bool swapped;
  for (i = 0; i < n - 1; i++)
  {
    swapped = false;
    for (j = 0; j < n - i - 1; j++)
    {
      if (array[j] < array[j + 1])
      {
        swap(&array[j], &array[j + 1]);
        swap(&idx[j], &idx[j + 1]);
        swapped = true;
      }
    }
    if (swapped == false)
    {
      break;
    }
  }
}

void EncReshape::cwPerturbation(int startBinIdx, int endBinIdx, uint16_t maxCW)
{
  for (int i = 0; i < m_binNum; i++)
  {
    if (i >= startBinIdx && i <= endBinIdx)
    {
      m_binCW[i] = (uint32_t) round((double) maxCW / (endBinIdx - startBinIdx + 1));
    }
    else
    {
      m_binCW[i] = 0;
    }
  }

  double hist = 0.0;
  uint16_t delta1 = 0, delta2 = 0;
  for (int i = 0; i < m_binNum; i++)
  {
    if (m_srcSeqStats.binHist[i] > 0.001)
    {
      hist = m_srcSeqStats.binHist[i] > 0.4 ? 0.4 : m_srcSeqStats.binHist[i];
      delta1 = (uint16_t)(10.0 * hist + 0.5);
      delta2 = (uint16_t)(20.0 * hist + 0.5);
      if (m_srcSeqStats.normVar[i] < 0.8)
      {
        m_binCW[i] = m_binCW[i] + delta2;
      }
      else if (m_srcSeqStats.normVar[i] < 0.9)
      {
        m_binCW[i] = m_binCW[i] + delta1;
      }
      if (m_srcSeqStats.normVar[i] > 1.2)
      {
        m_binCW[i] = m_binCW[i] - delta2;
      }
      else if (m_srcSeqStats.normVar[i] > 1.1)
      {
        m_binCW[i] = m_binCW[i] - delta1;
      }
    }
  }
}
void EncReshape::cwReduction(int startBinIdx, int endBinIdx)
{
  int bdShift = m_lumaBD - 10;
  int totCW = bdShift != 0 ? (bdShift > 0 ? m_reshapeLUTSize / (1 << bdShift) : m_reshapeLUTSize * (1 << (-bdShift))) : m_reshapeLUTSize;
  int maxAllowedCW = totCW - 1, usedCW = 0;
  for (int i = 0; i < m_binNum; i++)
  {
    usedCW += m_binCW[i];
  }
  if (usedCW > maxAllowedCW)
  {
    int deltaCW = usedCW - maxAllowedCW;
    int divCW = deltaCW / (endBinIdx - startBinIdx + 1);
    int modCW = deltaCW - divCW * (endBinIdx - startBinIdx + 1);
    if (divCW > 0)
    {
      for (int i = startBinIdx; i <= endBinIdx; i++)
      {
        m_binCW[i] -= divCW;
      }
    }
    for (int i = startBinIdx; i <= endBinIdx; i++)
    {
      if (modCW == 0)
      {
        break;
      }
      if (m_binCW[i] > 0)
      {
        m_binCW[i]--;
        modCW--;
      }
    }
  }
}
void EncReshape::deriveReshapeParametersSDR(bool *intraAdp, bool *interAdp)
{
  bool   isSkipCase = false;
  bool   isLowCase = false;
  int    firstBinVarLessThanVal1 = 0;
  int    firstBinVarLessThanVal2 = 0;
  int    firstBinVarLessThanVal3 = 0;
  double percBinVarLessThenVal1 = 0.0;
  double percBinVarLessThenVal2 = 0.0;
  double percBinVarLessThenVal3 = 0.0;
  int    *binIdxSortDsd = new int[m_binNum];
  double *binVarSortDsd = new double[m_binNum];
  double *binVarSortDsdCDF = new double[m_binNum];
  double ratioWeiVar = 0.0, ratioWeiVarNorm = 0.0;
  int startBinIdx = m_sliceReshapeInfo.reshaperModelMinBinIdx;
  int endBinIdx = m_sliceReshapeInfo.reshaperModelMaxBinIdx;

  for (int b = 0; b < m_binNum; b++)
  {
    binVarSortDsd[b] = m_srcSeqStats.binVar[b];
    binIdxSortDsd[b] = b;
  }
  bubbleSortDsd(binVarSortDsd, binIdxSortDsd, m_binNum);
  binVarSortDsdCDF[0] = m_srcSeqStats.binHist[binIdxSortDsd[0]];
  for (int b = 1; b < m_binNum; b++)
  {
    binVarSortDsdCDF[b] = binVarSortDsdCDF[b - 1] + m_srcSeqStats.binHist[binIdxSortDsd[b]];
  }
  for (int b = 0; b < m_binNum - 1; b++)
  {
    if (binVarSortDsd[b] > 3.4)
    {
      firstBinVarLessThanVal1 = b + 1;
    }
    if (binVarSortDsd[b] > 2.8)
    {
      firstBinVarLessThanVal2 = b + 1;
    }
    if (binVarSortDsd[b] > 2.5)
    {
      firstBinVarLessThanVal3 = b + 1;
    }
  }
  percBinVarLessThenVal1 = binVarSortDsdCDF[firstBinVarLessThanVal1];
  percBinVarLessThenVal2 = binVarSortDsdCDF[firstBinVarLessThanVal2];
  percBinVarLessThenVal3 = binVarSortDsdCDF[firstBinVarLessThanVal3];
  delete[] binIdxSortDsd;
  delete[] binVarSortDsd;
  delete[] binVarSortDsdCDF;

  cwPerturbation(startBinIdx, endBinIdx, (uint16_t)m_reshapeCW.binCW[1]);
  cwReduction(startBinIdx, endBinIdx);
  initSeqStats(m_rspSeqStats);
  for (int b = 0; b < m_binNum; b++)
  {
    double scale = (m_binCW[b] > 0) ? ((double)m_binCW[b] / (double)m_initCWAnalyze) : 1.0;
    m_rspSeqStats.binHist[b] = m_srcSeqStats.binHist[b];
    m_rspSeqStats.binVar[b] = m_srcSeqStats.binVar[b] + 2.0 * log10(scale);
  }
  m_rspSeqStats.minBinVar = 5.0;
  m_rspSeqStats.maxBinVar = 0.0;
  m_rspSeqStats.meanBinVar = 0.0;
  m_rspSeqStats.nonZeroCnt = 0;
  for (int b = 0; b < m_binNum; b++)
  {
    if (m_rspSeqStats.binHist[b] > 0.001)
    {
      m_rspSeqStats.nonZeroCnt++;
      m_rspSeqStats.meanBinVar += m_rspSeqStats.binVar[b];
      if (m_rspSeqStats.binVar[b] > m_rspSeqStats.maxBinVar)
      {
        m_rspSeqStats.maxBinVar = m_rspSeqStats.binVar[b];
      }
      if (m_rspSeqStats.binVar[b] < m_rspSeqStats.minBinVar)
      {
        m_rspSeqStats.minBinVar = m_rspSeqStats.binVar[b];
      }
    }
  }
  m_rspSeqStats.meanBinVar /= (double)m_rspSeqStats.nonZeroCnt;
  for (int b = 0; b < m_binNum; b++)
  {
    if (m_rspSeqStats.meanBinVar > 0.0)
    {
      m_rspSeqStats.normVar[b] = m_rspSeqStats.binVar[b] / m_rspSeqStats.meanBinVar;
    }
    m_rspSeqStats.weightVar += m_rspSeqStats.binHist[b] * m_rspSeqStats.binVar[b];
    m_rspSeqStats.weightNorm += m_rspSeqStats.binHist[b] * m_rspSeqStats.normVar[b];
  }
  ratioWeiVar = m_rspSeqStats.weightVar / m_srcSeqStats.weightVar;
  ratioWeiVarNorm = m_rspSeqStats.weightNorm / m_srcSeqStats.weightNorm;

  if ((m_srcSeqStats.binHist[0] + m_srcSeqStats.binHist[m_binNum - 1]) > 0.0001 && m_srcSeqStats.binHist[m_binNum - 2] < 0.001)
  {
    if (percBinVarLessThenVal3 > 0.8 && percBinVarLessThenVal2 > 0.4 && m_srcSeqStats.binVar[m_binNum - 2] > 4.8)
    {
      isSkipCase = true;
    }
    else if (percBinVarLessThenVal3 < 0.1 && percBinVarLessThenVal1 < 0.05 && m_srcSeqStats.binVar[m_binNum - 2] < 4.0)
    {
      isSkipCase = true;
    }
  }
  if (isSkipCase)
  {
    *intraAdp = false;
    *interAdp = false;
    return;
  }

  if (m_reshapeCW.rspPicSize > 5184000)
  {
    isLowCase = true;
  }
  else if (m_srcSeqStats.binVar[1] > 4.0)
  {
    isLowCase = true;
  }
  else if (m_rspSeqStats.meanBinVar > 3.4 && ratioWeiVarNorm > 1.005 && ratioWeiVar > 1.02)
  {
    isLowCase = true;
  }
  else if (m_rspSeqStats.meanBinVar > 3.1 && ratioWeiVarNorm > 1.005 && ratioWeiVar > 1.04)
  {
    isLowCase = true;
  }
  else if (m_rspSeqStats.meanBinVar > 2.8 && ratioWeiVarNorm > 1.01 && ratioWeiVar > 1.04)
  {
    isLowCase = true;
  }

  if (m_reshapeCW.updateCtrl == 0)
  {
    m_reshapeCW.binCW[1] = 1022;
    if (isLowCase)
    {
      *intraAdp = false;
      m_rateAdpMode = 1;
      m_reshapeCW.binCW[1] = 980;
      if (m_srcSeqStats.binHist[m_binNum - 2] > 0.05)
      {
        m_reshapeCW.binCW[1] = 896;
        if (m_srcSeqStats.binVar[m_binNum - 2] < 1.2)
        {
          m_reshapeCW.binCW[1] = 938;
        }
      }
      else if (percBinVarLessThenVal2 < 0.8 && percBinVarLessThenVal3 == 1.0)
      {
        m_rateAdpMode = 1;
        m_reshapeCW.binCW[1] = 938;
      }
    }
    if (m_srcSeqStats.binHist[m_binNum - 2] < 0.001)
    {
      if (m_srcSeqStats.binHist[1] > 0.05 && m_srcSeqStats.binVar[1] > 3.0)
      {
        *intraAdp = true;
        m_rateAdpMode = 1;
        m_reshapeCW.binCW[1] = 784;
      }
      else if (m_srcSeqStats.binHist[1] < 0.006)
      {
        *intraAdp = false;
        m_rateAdpMode = 0;
        m_reshapeCW.binCW[1] = 1008;
      }
      else if (percBinVarLessThenVal3 < 0.5)
      {
        *intraAdp = true;
        m_rateAdpMode = 0;
        m_reshapeCW.binCW[1] = 1022;
      }
    }
    else if ((m_srcSeqStats.maxBinVar > 4.0 && m_rspSeqStats.meanBinVar > 3.2 && percBinVarLessThenVal2 < 0.25) || ratioWeiVar < 1.03)
    {
      *intraAdp = true;
      m_rateAdpMode = 0;
      m_reshapeCW.binCW[1] = 1022;
    }
    if (*intraAdp == true && m_rateAdpMode == 0)
    {
      m_tcase = 9;
    }
  }
  else if (m_reshapeCW.updateCtrl == 1)
  {
    m_reshapeCW.binCW[1] = 952;
    if (isLowCase)
    {
      if (m_reshapeCW.rspPicSize > 5184000)
      {
        m_rateAdpMode = 1;
        m_reshapeCW.binCW[1] = 812;
      }
      if (m_srcSeqStats.binHist[m_binNum - 2] > 0.05)
      {
        m_rateAdpMode = 1;
        m_reshapeCW.binCW[1] = 812;
        if (m_srcSeqStats.binHist[m_binNum - 2] > 0.1 || m_srcSeqStats.binHist[1] > 0.1)
        {
          m_rateAdpMode = 0;
          m_reshapeCW.binCW[1] = 924;
        }
      }
      else if (percBinVarLessThenVal2 < 0.8 && percBinVarLessThenVal3 == 1.0)
      {
        m_rateAdpMode = 1;
        m_reshapeCW.binCW[1] = 896;
      }
      else if (percBinVarLessThenVal2 > 0.98 && m_srcSeqStats.binHist[1] > 0.05)
      {
        m_rateAdpMode = 0;
        m_reshapeCW.binCW[1] = 784;
      }
      else if (percBinVarLessThenVal2 < 0.1)
      {
        m_rateAdpMode = 0;
        m_reshapeCW.binCW[1] = 1022;
      }
    }
    if (m_srcSeqStats.binHist[1] > 0.1 && (m_srcSeqStats.binVar[1] > 1.8 && m_srcSeqStats.binVar[1] < 3.0))
    {
      m_rateAdpMode = 1;
      if (m_srcSeqStats.binVar[m_binNum - 2] > 1.2 && m_srcSeqStats.binVar[m_binNum - 2] < 4.0)
      {
        m_reshapeCW.binCW[1] = 784;
      }
    }
    else if (m_srcSeqStats.binHist[m_binNum - 2] < 0.001)
    {
      if (m_srcSeqStats.binHist[1] > 0.05 && m_srcSeqStats.binVar[1] > 3.0)
      {
        m_rateAdpMode = 1;
        m_reshapeCW.binCW[1] = 784;
      }
      else if (m_srcSeqStats.binHist[1] < 0.006)
      {
        m_rateAdpMode = 0;
        m_reshapeCW.binCW[1] = 980;
      }
      else if (percBinVarLessThenVal3 < 0.5)
      {
        m_rateAdpMode = 0;
        m_reshapeCW.binCW[1] = 924;
      }
    }
    else if ((m_srcSeqStats.maxBinVar > 4.0 && m_rspSeqStats.meanBinVar > 3.2 && percBinVarLessThenVal2 < 0.25) || ratioWeiVar < 1.03)
    {
      m_rateAdpMode = 0;
      m_reshapeCW.binCW[1] = 980;
    }
  }
  else
  {
    m_useAdpCW = true;
    m_reshapeCW.binCW[0] = 36;  m_reshapeCW.binCW[1] = 30;
    if (isLowCase)
    {
      if (m_srcSeqStats.binHist[m_binNum - 2] > 0.05)
      {
        m_useAdpCW = false;
        m_rateAdpMode = 1;
        m_reshapeCW.binCW[1] = 896;
        if (m_srcSeqStats.binHist[1] > 0.005)
        {
          m_rateAdpMode = 0;
        }
      }
      else if (percBinVarLessThenVal2 < 0.8 && percBinVarLessThenVal3 == 1.0)
      {
        m_reshapeCW.binCW[1] = 28;
      }
    }
    if (m_srcSeqStats.binHist[1] > 0.1 && m_srcSeqStats.binVar[1] > 1.8 && m_srcSeqStats.binVar[1] < 3.0)
    {
      m_useAdpCW = false;
      m_rateAdpMode = 1;
      m_reshapeCW.binCW[1] = 952;
    }
    else if (m_srcSeqStats.binHist[1] > 0.05 && m_srcSeqStats.binHist[m_binNum - 2] < 0.001 && m_srcSeqStats.binVar[1] > 3.0)
    {
      m_useAdpCW = false;
      m_rateAdpMode = 1;
      m_reshapeCW.binCW[1] = 784;
    }
    else if (m_srcSeqStats.binHist[1] > 0.05 && m_srcSeqStats.binHist[m_binNum - 2] < 0.005 && m_srcSeqStats.binVar[1] > 1.0 && m_srcSeqStats.binVar[1] < 1.5)
    {
      m_rateAdpMode = 2;
      m_reshapeCW.binCW[0] = 38;
    }
    else if (m_srcSeqStats.binHist[1] < 0.005 && m_srcSeqStats.binHist[m_binNum - 2] > 0.05 && m_srcSeqStats.binVar[m_binNum - 2] > 1.0 && m_srcSeqStats.binVar[m_binNum - 2] < 1.5)
    {
      m_rateAdpMode = 2;
      m_reshapeCW.binCW[0] = 36;
    }
    else if (m_srcSeqStats.binHist[1] > 0.02 && m_srcSeqStats.binHist[m_binNum - 2] > 0.04 && m_srcSeqStats.binVar[1] < 2.0 && m_srcSeqStats.binVar[m_binNum - 2] < 1.5)
    {
      m_rateAdpMode = 2;
      m_reshapeCW.binCW[0] = 34;
    }
    else if ((m_srcSeqStats.binHist[1] > 0.05 && m_srcSeqStats.binHist[m_binNum - 2] > 0.2 && m_srcSeqStats.binVar[1] > 3.0 && m_srcSeqStats.binVar[1] < 4.0) || ratioWeiVar < 1.03)
    {
      m_rateAdpMode = 1;
      m_reshapeCW.binCW[0] = 34;
    }
    else if (m_srcSeqStats.binVar[1] < 4.0 && percBinVarLessThenVal2 == 1.0 && percBinVarLessThenVal3 == 1.0)
    {
      m_rateAdpMode = 0;
      m_reshapeCW.binCW[0] = 34;
    }
    if (m_useAdpCW && !isLowCase)
    {
      m_reshapeCW.binCW[1] = 66 - m_reshapeCW.binCW[0];
    }
  }
}

void EncReshape::deriveReshapeParameters(double *array, int start, int end, ReshapeCW respCW, double &alpha, double &beta)
{
  double minVar = 10.0, maxVar = 0.0;
  for (int b = start; b <= end; b++)
  {
    if (array[b] < minVar)
    {
      minVar = array[b];
    }
    if (array[b] > maxVar)
    {
      maxVar = array[b];
    }
  }
  double maxCW = (double)respCW.binCW[0];
  double minCW = (double)respCW.binCW[1];
  alpha = (minCW - maxCW) / (maxVar - minVar);
  beta = (maxCW*maxVar - minCW*minVar) / (maxVar - minVar);
}

/**
-Init reshaping LUT  from dQP model
*/
void EncReshape::initLUTfromdQPModel()
{
  int pwlFwdLUTsize = PIC_CODE_CW_BINS;
  int pwlFwdBinLen = m_reshapeLUTSize / PIC_CODE_CW_BINS;
  double lumaDQP = 0.0;
  double * slopeLUT = new double[m_reshapeLUTSize]();
  double * fwdLUTHighPrec = new double[m_reshapeLUTSize]();
  for (int i = 0; i < m_reshapeLUTSize; i++)
  {
    int inputY = m_lumaBD < 10 ? i << (10 - m_lumaBD) : m_lumaBD > 10 ? i >> (m_lumaBD - 10) : i;
    lumaDQP = 0.015*(double)inputY - 7.5;
    lumaDQP = lumaDQP<-3 ? -3 : (lumaDQP>6 ? 6 : lumaDQP);
    slopeLUT[i] = pow(2.0, lumaDQP / 6.0);
  }
  for (int i = 0; i < (16 << (m_lumaBD - 8)); i++)
  {
    slopeLUT[i] = 0.0;
  }
  for (int i = (235 << (m_lumaBD - 8)); i < m_reshapeLUTSize; i++)
  {
    slopeLUT[i] = 0.0;
  }
  for (int i = 0; i < m_reshapeLUTSize - 1; i++)
  {
    fwdLUTHighPrec[i + 1] = fwdLUTHighPrec[i] + slopeLUT[i];
  }
  if (slopeLUT != nullptr)
  {
    delete[] slopeLUT;
    slopeLUT = nullptr;
  }

  double maxY = fwdLUTHighPrec[m_reshapeLUTSize - 1];
  for (int i = 0; i < m_reshapeLUTSize; i++)
  {
    m_fwdLUT[i] = (int16_t)((fwdLUTHighPrec[i] / maxY * (double)(m_reshapeLUTSize - 1)) + 0.5);
  }

  if (fwdLUTHighPrec != nullptr)
  {
    delete[] fwdLUTHighPrec;
    fwdLUTHighPrec = nullptr;
  }
  m_sliceReshapeInfo.reshaperModelMinBinIdx = 1;
  m_sliceReshapeInfo.reshaperModelMaxBinIdx = PIC_CODE_CW_BINS-2;

  for (int i = 0; i < pwlFwdLUTsize; i++)
  {
    int16_t X1 = i * pwlFwdBinLen;
    m_reshapePivot[i] = m_fwdLUT[X1];
  }
  m_reshapePivot[pwlFwdLUTsize] = ((1 << m_lumaBD) - 1);

  for (int i = 0; i < pwlFwdLUTsize; i++)
  {
    m_binCW[i] = m_reshapePivot[i + 1] - m_reshapePivot[i];
  }
  for (int i = 0; i <= PIC_CODE_CW_BINS; i++)
  {
    m_inputPivot[i] = m_initCW * i;
  }

  adjustLmcsPivot();

  int maxAbsDeltaCW = 0, absDeltaCW = 0, deltaCW = 0;
  for (int i = m_sliceReshapeInfo.reshaperModelMinBinIdx; i <= m_sliceReshapeInfo.reshaperModelMaxBinIdx; i++)
  {
    deltaCW = (int)m_binCW[i] - (int)m_initCW;
    m_sliceReshapeInfo.reshaperModelBinCWDelta[i] = deltaCW;
    absDeltaCW = (deltaCW < 0) ? (-deltaCW) : deltaCW;
    if (absDeltaCW > maxAbsDeltaCW)
    {
      maxAbsDeltaCW = absDeltaCW;
    }
  }
  m_sliceReshapeInfo.maxNbitsNeededDeltaCW = std::max(1, 1 + floorLog2(maxAbsDeltaCW));

  for (int i = 0; i < pwlFwdLUTsize; i++)
  {
    m_fwdScaleCoef[i] = ((int32_t)m_binCW[i] * (1 << FP_PREC) + (1 << (floorLog2(pwlFwdBinLen) - 1))) >> floorLog2(pwlFwdBinLen);
    if (m_binCW[i] == 0)
    {
      m_invScaleCoef[i] = 0;
      m_chromaAdjHelpLUT[i] = 1 << CSCALE_FP_PREC;
    }
    else
    {
      CHECK((m_binCW[i] + m_sliceReshapeInfo.chrResScalingOffset) < (m_initCW >> 3) || (m_binCW[i] + m_sliceReshapeInfo.chrResScalingOffset) > ((m_initCW << 3) - 1),
        "It is a requirement of bitstream conformance that, when lmcsCW[ i ] is not equal to 0, ( lmcsCW[ i ] + lmcsDeltaCrs ) shall be in the range of ( OrgCW >> 3 ) to ( ( OrgCW << 3 ) - 1 ), inclusive.");
      m_invScaleCoef[i] = (int32_t)(m_initCW * (1 << FP_PREC) / m_binCW[i]);
      m_chromaAdjHelpLUT[i] = (int32_t)(m_initCW * (1 << FP_PREC) / (m_binCW[i] + m_sliceReshapeInfo.chrResScalingOffset));
    }
  }
  for (int lumaSample = 0; lumaSample < m_reshapeLUTSize; lumaSample++)
  {
    int idxY = lumaSample / m_initCW;
    int tempVal = m_reshapePivot[idxY] + ((m_fwdScaleCoef[idxY] * (lumaSample - m_inputPivot[idxY]) + (1 << (FP_PREC - 1))) >> FP_PREC);
    m_fwdLUT[lumaSample] = Clip3((Pel)0, (Pel)((1 << m_lumaBD) - 1), (Pel)(tempVal));

    int idxYInv = getPWLIdxInv(lumaSample);
    int invSample = m_inputPivot[idxYInv] + ((m_invScaleCoef[idxYInv] * (lumaSample - m_reshapePivot[idxYInv]) + (1 << (FP_PREC - 1))) >> FP_PREC);
    m_invLUT[lumaSample] = Clip3((Pel)0, (Pel)((1 << m_lumaBD) - 1), (Pel)(invSample));
  }
}

void EncReshape::constructReshaperLMCS()
{
  int bdShift = m_lumaBD - 10;
  int totCW = bdShift != 0 ? (bdShift > 0 ? m_reshapeLUTSize / (1 << bdShift) : m_reshapeLUTSize * (1 << (-bdShift))) : m_reshapeLUTSize;
  int histLenth = totCW / m_binNum;
  int log2HistLenth = floorLog2(histLenth);
  int i;

  if (m_binNum == PIC_ANALYZE_CW_BINS)
  {
    for (int i = 0; i < PIC_CODE_CW_BINS; i++)
    {
      m_binCW[i] = m_binCW[2 * i] + m_binCW[2 * i + 1];
    }
  }
  for (int i = 0; i <= PIC_CODE_CW_BINS; i++)
  {
    m_inputPivot[i] = m_initCW * i;
  }

  m_sliceReshapeInfo.reshaperModelMinBinIdx = 0;
  m_sliceReshapeInfo.reshaperModelMaxBinIdx = PIC_CODE_CW_BINS - 1;
  for (int i = 0; i < PIC_CODE_CW_BINS; i++)
  {
    if (m_binCW[i] > 0)
    {
      m_sliceReshapeInfo.reshaperModelMinBinIdx = i;
      break;
    }
  }
  for (int i = PIC_CODE_CW_BINS - 1; i >= 0; i--)
  {
    if (m_binCW[i] > 0)
    {
      m_sliceReshapeInfo.reshaperModelMaxBinIdx = i;
      break;
    }
  }

  if (bdShift != 0)
  {
    for (int i = 0; i < PIC_ANALYZE_CW_BINS; i++)
    {
      m_binCW[i] = bdShift > 0 ? m_binCW[i] * (1 << bdShift) : m_binCW[i] / (1 << (-bdShift));
    }
  }

  adjustLmcsPivot();

  int maxAbsDeltaCW = 0, absDeltaCW = 0, deltaCW = 0;
  for (int i = m_sliceReshapeInfo.reshaperModelMinBinIdx; i <= m_sliceReshapeInfo.reshaperModelMaxBinIdx; i++)
  {
    deltaCW = (int)m_binCW[i] - (int)m_initCW;
    m_sliceReshapeInfo.reshaperModelBinCWDelta[i] = deltaCW;
    absDeltaCW = (deltaCW < 0) ? (-deltaCW) : deltaCW;
    if (absDeltaCW > maxAbsDeltaCW)
    {
      maxAbsDeltaCW = absDeltaCW;
    }
  }
  m_sliceReshapeInfo.maxNbitsNeededDeltaCW = std::max(1, 1 + floorLog2(maxAbsDeltaCW));

  histLenth = m_initCW;
  log2HistLenth = floorLog2(histLenth);

  int sumBins = 0;
  for (i = 0; i < PIC_CODE_CW_BINS; i++) { sumBins += m_binCW[i]; }
  CHECK(sumBins >= m_reshapeLUTSize, "SDR CW assignment is wrong!!");
  for (int i = 0; i < PIC_CODE_CW_BINS; i++)
  {
    m_reshapePivot[i + 1] = m_reshapePivot[i] + m_binCW[i];
    m_fwdScaleCoef[i] = ((int32_t)m_binCW[i] * (1 << FP_PREC) + (1 << (log2HistLenth - 1))) >> log2HistLenth;
    if (m_binCW[i] == 0)
    {
      m_invScaleCoef[i] = 0;
      m_chromaAdjHelpLUT[i] = 1 << CSCALE_FP_PREC;
    }
    else
    {
      CHECK((m_binCW[i] + m_sliceReshapeInfo.chrResScalingOffset) < (m_initCW >> 3) || (m_binCW[i] + m_sliceReshapeInfo.chrResScalingOffset) > ((m_initCW << 3) - 1),
        "It is a requirement of bitstream conformance that, when lmcsCW[ i ] is not equal to 0, ( lmcsCW[ i ] + lmcsDeltaCrs ) shall be in the range of ( OrgCW >> 3 ) to ( ( OrgCW << 3 ) - 1 ), inclusive.");
      m_invScaleCoef[i] = (int32_t)(m_initCW * (1 << FP_PREC) / m_binCW[i]);
      m_chromaAdjHelpLUT[i] = (int32_t)(m_initCW * (1 << FP_PREC) / (m_binCW[i] + m_sliceReshapeInfo.chrResScalingOffset));
    }
  }
  for (int lumaSample = 0; lumaSample < m_reshapeLUTSize; lumaSample++)
  {
    int idxY = lumaSample / m_initCW;
    int tempVal = m_reshapePivot[idxY] + ((m_fwdScaleCoef[idxY] * (lumaSample - m_inputPivot[idxY]) + (1 << (FP_PREC - 1))) >> FP_PREC);
    m_fwdLUT[lumaSample] = Clip3((Pel)0, (Pel)((1 << m_lumaBD) - 1), (Pel)(tempVal));

    int idxYInv = getPWLIdxInv(lumaSample);
    int invSample = m_inputPivot[idxYInv] + ((m_invScaleCoef[idxYInv] * (lumaSample - m_reshapePivot[idxYInv]) + (1 << (FP_PREC - 1))) >> FP_PREC);
    m_invLUT[lumaSample] = Clip3((Pel)0, (Pel)((1 << m_lumaBD) - 1), (Pel)(invSample));
  }
  for (i = 0; i < PIC_CODE_CW_BINS; i++)
  {
    int start = i*histLenth;
    int end = (i + 1)*histLenth - 1;
    m_cwLumaWeight[i] = m_fwdLUT[end] - m_fwdLUT[start];
  }
}

void EncReshape::adjustLmcsPivot()
{
  int bdShift = m_lumaBD - 10;
  int totCW = bdShift != 0 ? (bdShift > 0 ? m_reshapeLUTSize / (1 << bdShift) : m_reshapeLUTSize * (1 << (-bdShift))) : m_reshapeLUTSize;
  int orgCW = totCW / PIC_CODE_CW_BINS;
  int log2SegSize = m_lumaBD - floorLog2(LMCS_SEG_NUM);

  m_reshapePivot[0] = 0;
  for (int i = 0; i < PIC_CODE_CW_BINS; i++)
  {
    m_reshapePivot[i + 1] = m_reshapePivot[i] + m_binCW[i];
  }
  int segIdxMax = (m_reshapePivot[m_sliceReshapeInfo.reshaperModelMaxBinIdx + 1] >> log2SegSize);
  for (int i = m_sliceReshapeInfo.reshaperModelMinBinIdx; i <= m_sliceReshapeInfo.reshaperModelMaxBinIdx; i++)
  {
    m_reshapePivot[i + 1] = m_reshapePivot[i] + m_binCW[i];
    int segIdxCurr = (m_reshapePivot[i]     >> log2SegSize);
    int segIdxNext = (m_reshapePivot[i + 1] >> log2SegSize);

    if ((segIdxCurr == segIdxNext) && (m_reshapePivot[i] != (segIdxCurr << log2SegSize)))
    {
      if (segIdxCurr == segIdxMax)
      {
        m_reshapePivot[i] = m_reshapePivot[m_sliceReshapeInfo.reshaperModelMaxBinIdx + 1];
        for (int j = i; j <= m_sliceReshapeInfo.reshaperModelMaxBinIdx; j++)
        {
          m_reshapePivot[j + 1] = m_reshapePivot[i];
          m_binCW[j] = 0;
        }
        m_binCW[i - 1] = m_reshapePivot[i] - m_reshapePivot[i - 1];
        break;
      }
      else
      {
        int16_t adjustVal = ((segIdxCurr + 1) << log2SegSize) - m_reshapePivot[i + 1];
        m_reshapePivot[i + 1] += adjustVal;
        m_binCW[i] += adjustVal;

        for (int j = i + 1; j <= m_sliceReshapeInfo.reshaperModelMaxBinIdx; j++)
        {
          if (m_binCW[j] < (adjustVal + (orgCW >> 3)))
          {
            adjustVal -= (m_binCW[j] - (orgCW >> 3));
            m_binCW[j] = (orgCW >> 3);
          }
          else
          {
            m_binCW[j] -= adjustVal;
            adjustVal = 0;
          }
          if (adjustVal == 0)
          {
            break;
          }
        }
      }
    }
  }

  for (int i = PIC_CODE_CW_BINS - 1; i >= 0; i--)
  {
    if (m_binCW[i] > 0)
    {
      m_sliceReshapeInfo.reshaperModelMaxBinIdx = i;
      break;
    }
  }
}
//
//! \}