Picture.cpp

/* The copyright in this software is being made available under the BSD
* License, included below. This software may be subject to other third party
* and contributor rights, including patent rights, and no such rights are
* granted under this license.
*
* Copyright (c) 2010-2023, ITU/ISO/IEC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*  * Redistributions of source code must retain the above copyright notice,
*    this list of conditions and the following disclaimer.
*  * Redistributions in binary form must reproduce the above copyright notice,
*    this list of conditions and the following disclaimer in the documentation
*    and/or other materials provided with the distribution.
*  * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
*    be used to endorse or promote products derived from this software without
*    specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/

/** \file     Picture.cpp
 *  \brief    Description of a coded picture
 */

#include "Picture.h"
#include "SEI.h"
#include "ChromaFormat.h"
#include "CommonLib/InterpolationFilter.h"

#if ENABLE_SPLIT_PARALLELISM

int g_wppThreadId( 0 );
#pragma omp threadprivate(g_wppThreadId)

#if ENABLE_SPLIT_PARALLELISM
int g_splitThreadId( 0 );
#pragma omp threadprivate(g_splitThreadId)

int g_splitJobId( 0 );
#pragma omp threadprivate(g_splitJobId)
#endif

Scheduler::Scheduler() :
#if ENABLE_SPLIT_PARALLELISM
  m_numSplitThreads( 1 )
#endif
{
}

Scheduler::~Scheduler()
{
}

#if ENABLE_SPLIT_PARALLELISM
unsigned Scheduler::getSplitDataId( int jobId ) const
{
  if( m_numSplitThreads > 1 && m_hasParallelBuffer )
  {
    int splitJobId = jobId == CURR_THREAD_ID ? g_splitJobId : jobId;

    return ( g_wppThreadId * NUM_RESERVERD_SPLIT_JOBS ) + splitJobId;
  }
  else
  {
    return 0;
  }
}

unsigned Scheduler::getSplitPicId( int tId /*= CURR_THREAD_ID */ ) const
{
  if( m_numSplitThreads > 1 && m_hasParallelBuffer )
  {
    int threadId = tId == CURR_THREAD_ID ? g_splitThreadId : tId;

    return ( g_wppThreadId * m_numSplitThreads ) + threadId;
  }
  else
  {
    return 0;
  }
}

unsigned Scheduler::getSplitJobId() const
{
  if( m_numSplitThreads > 1 )
  {
    return g_splitJobId;
  }
  else
  {
    return 0;
  }
}

void Scheduler::setSplitJobId( const int jobId )
{
  CHECK( g_splitJobId != 0 && jobId != 0, "Need to reset the jobId after usage!" );
  g_splitJobId = jobId;
}

void Scheduler::startParallel()
{
  m_hasParallelBuffer = true;
}

void Scheduler::finishParallel()
{
  m_hasParallelBuffer = false;
}

void Scheduler::setSplitThreadId( const int tId )
{
  g_splitThreadId = tId == CURR_THREAD_ID ? omp_get_thread_num() : tId;
}

#endif



unsigned Scheduler::getDataId() const
{
#if ENABLE_SPLIT_PARALLELISM
  if( m_numSplitThreads > 1 )
  {
    return getSplitDataId();
  }
#endif
  return 0;
}

bool Scheduler::init( const int ctuYsize, const int ctuXsize, const int numWppThreadsRunning, const int numWppExtraLines, const int numSplitThreads )
{
#if ENABLE_SPLIT_PARALLELISM
  m_numSplitThreads = numSplitThreads;
#endif

  return true;
}


int Scheduler::getNumPicInstances() const
{
#if !ENABLE_SPLIT_PARALLELISM
  return 1;
#else
  return ( m_numSplitThreads > 1 ? m_numSplitThreads : 1 );
#endif
}

#endif


// ---------------------------------------------------------------------------
// picture methods
// ---------------------------------------------------------------------------



Picture::Picture()
{
  cs                   = nullptr;
  m_isSubPicBorderSaved = false;
  m_bIsBorderExtended  = false;
  m_wrapAroundValid    = false;
  m_wrapAroundOffset   = 0;
  usedByCurr           = false;
  longTerm             = false;
  reconstructed        = false;
  neededForOutput      = false;
  referenced           = false;
  temporalId           = std::numeric_limits<uint32_t>::max();
  fieldPic             = false;
  topField             = false;
  precedingDRAP        = false;
#if JVET_S0124_UNAVAILABLE_REFERENCE
  nonReferencePictureFlag = false;
#endif

  for( int i = 0; i < MAX_NUM_CHANNEL_TYPE; i++ )
  {
    m_prevQP[i] = -1;
  }
  m_spliceIdx = NULL;
  m_ctuNums = 0;
  layerId = NOT_VALID;
#if !JVET_S0258_SUBPIC_CONSTRAINTS
  numSubpics = 1;
#endif
  numSlices = 1;
  unscaledPic = nullptr;
#if JVET_Z0118_GDR
  m_cleanDirtyFlag = false;
#endif
}

void Picture::create(
#if JVET_Z0118_GDR
  const bool gdrEnabled,
#endif
  const bool useWrapAround, const ChromaFormat &_chromaFormat, const Size &size, const unsigned _maxCUSize,
  const unsigned _margin,
  const bool _decoder, const int _layerId, const bool gopBasedTemporalFilterEnabled)
{
  layerId = _layerId;
  UnitArea::operator=( UnitArea( _chromaFormat, Area( Position{ 0, 0 }, size ) ) );
  margin            =  MAX_SCALING_RATIO*_margin;
  const Area a      = Area( Position(), size );

#if JVET_Z0118_GDR
  int numPt = (gdrEnabled) ? 2 : 1;
  for (int i = 0; i < numPt; i++)
  {
    M_BUFS(0, PIC_RECONSTRUCTION_0 + i).create(_chromaFormat, a, _maxCUSize, margin, MEMORY_ALIGN_DEF_SIZE);
  }  
#else
  M_BUFS( 0, PIC_RECONSTRUCTION ).create( _chromaFormat, a, _maxCUSize, margin, MEMORY_ALIGN_DEF_SIZE );
#endif

  if (useWrapAround)
  {
    M_BUFS( 0, PIC_RECON_WRAP ).create( _chromaFormat, a, _maxCUSize, margin, MEMORY_ALIGN_DEF_SIZE );
  }

  
  if( !_decoder )
  {
    M_BUFS( 0, PIC_ORIGINAL ).    create( _chromaFormat, a );
    M_BUFS( 0, PIC_TRUE_ORIGINAL ). create( _chromaFormat, a );

    if( gopBasedTemporalFilterEnabled )
    {
      M_BUFS( 0, PIC_FILTERED_ORIGINAL ).create( _chromaFormat, a );
    }

  }
#if !KEEP_PRED_AND_RESI_SIGNALS
  m_ctuArea = UnitArea( _chromaFormat, Area( Position{ 0, 0 }, Size( _maxCUSize, _maxCUSize ) ) );
#endif
  m_hashMap.clearAll();
}

void Picture::destroy()
{
#if ENABLE_SPLIT_PARALLELISM
  for( int jId = 0; jId < PARL_SPLIT_MAX_NUM_THREADS; jId++ )
#endif
  {
    for (uint32_t t = 0; t < NUM_PIC_TYPES; t++)
    {
      M_BUFS(jId, t).destroy();
    }
    m_hashMap.clearAll();
    if (cs)
    {
      cs->destroy();
      delete cs;
      cs = nullptr;
    }

    for (auto &ps: slices)
    {
      delete ps;
    }
    slices.clear();

    for (auto &psei: SEIs)
    {
      delete psei;
    }
    SEIs.clear();

    if (m_spliceIdx)
    {
      delete[] m_spliceIdx;
      m_spliceIdx = NULL;
    }
  }
}

void Picture::createTempBuffers( const unsigned _maxCUSize )
{
#if KEEP_PRED_AND_RESI_SIGNALS
  const Area a( Position{ 0, 0 }, lumaSize() );
#else
  const Area a = m_ctuArea.Y();
#if JVET_AC0162_ALF_RESIDUAL_SAMPLES_INPUT
  const Area aOld( Position{ 0, 0 }, lumaSize() );
#endif
#endif

#if ENABLE_SPLIT_PARALLELISM
  scheduler.startParallel();

  for( int jId = 0; jId < scheduler.getNumPicInstances(); jId++ )
#endif
  {
    M_BUFS( jId, PIC_PREDICTION                   ).create( chromaFormat, a,   _maxCUSize );
#if JVET_AC0162_ALF_RESIDUAL_SAMPLES_INPUT && !KEEP_PRED_AND_RESI_SIGNALS
    M_BUFS( jId, PIC_RESIDUAL                     ).create(chromaFormat, aOld, _maxCUSize );
#else
    M_BUFS( jId, PIC_RESIDUAL                     ).create( chromaFormat, a,   _maxCUSize );
#endif
#if ENABLE_SPLIT_PARALLELISM
    if (jId > 0)
    {
      M_BUFS(jId, PIC_RECONSTRUCTION).create(chromaFormat, Y(), _maxCUSize, margin, MEMORY_ALIGN_DEF_SIZE);
    }
#endif
  }

  if (cs)
  {
    cs->rebindPicBufs();
  }
}

void Picture::destroyTempBuffers()
{
#if ENABLE_SPLIT_PARALLELISM
  scheduler.finishParallel();

  for( int jId = 0; jId < scheduler.getNumPicInstances(); jId++ )
#endif
  {
    for (uint32_t t = 0; t < NUM_PIC_TYPES; t++)
    {
      if (t == PIC_RESIDUAL || t == PIC_PREDICTION)
      {
        M_BUFS(jId, t).destroy();
      }
#if ENABLE_SPLIT_PARALLELISM
      if (t == PIC_RECONSTRUCTION && jId > 0)
      {
        M_BUFS(jId, t).destroy();
      }
#endif
    }
  }

  if (cs)
  {
    cs->rebindPicBufs();
  }
}

       PelBuf     Picture::getOrigBuf(const CompArea &blk)        { return getBuf(blk,  PIC_ORIGINAL); }
const CPelBuf     Picture::getOrigBuf(const CompArea &blk)  const { return getBuf(blk,  PIC_ORIGINAL); }
       PelUnitBuf Picture::getOrigBuf(const UnitArea &unit)       { return getBuf(unit, PIC_ORIGINAL); }
const CPelUnitBuf Picture::getOrigBuf(const UnitArea &unit) const { return getBuf(unit, PIC_ORIGINAL); }
       PelUnitBuf Picture::getOrigBuf()                           { return M_BUFS(0,    PIC_ORIGINAL); }
const CPelUnitBuf Picture::getOrigBuf()                     const { return M_BUFS(0,    PIC_ORIGINAL); }

       PelBuf     Picture::getOrigBuf(const ComponentID compID)       { return getBuf(compID, PIC_ORIGINAL); }
const CPelBuf     Picture::getOrigBuf(const ComponentID compID) const { return getBuf(compID, PIC_ORIGINAL); }
       PelUnitBuf Picture::getTrueOrigBuf()                           { return M_BUFS(0, PIC_TRUE_ORIGINAL); }
const CPelUnitBuf Picture::getTrueOrigBuf()                     const { return M_BUFS(0, PIC_TRUE_ORIGINAL); }
       PelBuf     Picture::getTrueOrigBuf(const CompArea &blk)        { return getBuf(blk, PIC_TRUE_ORIGINAL); }
const CPelBuf     Picture::getTrueOrigBuf(const CompArea &blk)  const { return getBuf(blk, PIC_TRUE_ORIGINAL); }


       PelBuf     Picture::getTrueOrigBuf(const ComponentID compID)       { return getBuf(compID, PIC_TRUE_ORIGINAL); }
const CPelBuf     Picture::getTrueOrigBuf(const ComponentID compID) const { return getBuf(compID, PIC_TRUE_ORIGINAL); }


       PelUnitBuf Picture::getFilteredOrigBuf()                           { return M_BUFS(0, PIC_FILTERED_ORIGINAL); }
const CPelUnitBuf Picture::getFilteredOrigBuf()                     const { return M_BUFS(0, PIC_FILTERED_ORIGINAL); }
       PelBuf     Picture::getFilteredOrigBuf(const CompArea &blk)        { return getBuf(blk, PIC_FILTERED_ORIGINAL); }
const CPelBuf     Picture::getFilteredOrigBuf(const CompArea &blk)  const { return getBuf(blk, PIC_FILTERED_ORIGINAL); }


       PelBuf     Picture::getPredBuf(const CompArea &blk)        { return getBuf(blk,  PIC_PREDICTION); }
const CPelBuf     Picture::getPredBuf(const CompArea &blk)  const { return getBuf(blk,  PIC_PREDICTION); }
       PelUnitBuf Picture::getPredBuf(const UnitArea &unit)       { return getBuf(unit, PIC_PREDICTION); }
const CPelUnitBuf Picture::getPredBuf(const UnitArea &unit) const { return getBuf(unit, PIC_PREDICTION); }

#if JVET_AC0162_ALF_RESIDUAL_SAMPLES_INPUT
void Picture::setResiBufPLT()
{
  for (uint64_t k = 0; k < cs->cus.size(); k++)
  {
    CodingUnit *cu = cs->cus[k];
    for (int compID = 0; compID < 1; compID++)
    {
      if (cu->predMode == MODE_PLT)
      {
        const ComponentID comp     = ComponentID(compID);
        const CompArea   &compArea = cu->block(comp);

        getResiBuf(compArea).fill(0);
      }
    }
  }
}
#endif

       PelBuf     Picture::getResiBuf(const CompArea &blk)        { return getBuf(blk,  PIC_RESIDUAL); }
const CPelBuf     Picture::getResiBuf(const CompArea &blk)  const { return getBuf(blk,  PIC_RESIDUAL); }
       PelUnitBuf Picture::getResiBuf(const UnitArea &unit)       { return getBuf(unit, PIC_RESIDUAL); }
const CPelUnitBuf Picture::getResiBuf(const UnitArea &unit) const { return getBuf(unit, PIC_RESIDUAL); }

#if JVET_Z0118_GDR
       PelBuf     Picture::getRecoBuf(const ComponentID compID, bool wrap)       { return getBuf(compID, (PictureType) wrap ? PIC_RECON_WRAP : (m_cleanDirtyFlag ? PIC_RECONSTRUCTION_1 : PIC_RECONSTRUCTION_0)); }
const CPelBuf     Picture::getRecoBuf(const ComponentID compID, bool wrap) const { return getBuf(compID, (PictureType) wrap ? PIC_RECON_WRAP : (m_cleanDirtyFlag ? PIC_RECONSTRUCTION_1 : PIC_RECONSTRUCTION_0)); }
       PelBuf     Picture::getRecoBuf(const CompArea &blk, bool wrap)            { return getBuf(blk,    (PictureType) wrap ? PIC_RECON_WRAP : (m_cleanDirtyFlag ? PIC_RECONSTRUCTION_1 : PIC_RECONSTRUCTION_0)); }
const CPelBuf     Picture::getRecoBuf(const CompArea &blk, bool wrap)      const { return getBuf(blk,    (PictureType) wrap ? PIC_RECON_WRAP : (m_cleanDirtyFlag ? PIC_RECONSTRUCTION_1 : PIC_RECONSTRUCTION_0)); }
       PelUnitBuf Picture::getRecoBuf(const UnitArea &unit, bool wrap)           { return getBuf(unit,   (PictureType) wrap ? PIC_RECON_WRAP : (m_cleanDirtyFlag ? PIC_RECONSTRUCTION_1 : PIC_RECONSTRUCTION_0)); }
const CPelUnitBuf Picture::getRecoBuf(const UnitArea &unit, bool wrap)     const { return getBuf(unit,   (PictureType) wrap ? PIC_RECON_WRAP : (m_cleanDirtyFlag ? PIC_RECONSTRUCTION_1 : PIC_RECONSTRUCTION_0)); }
       PelUnitBuf Picture::getRecoBuf(bool wrap)                                 { return M_BUFS(scheduler.getSplitPicId(), wrap ? PIC_RECON_WRAP : (PictureType) (m_cleanDirtyFlag ? PIC_RECONSTRUCTION_1 : PIC_RECONSTRUCTION_0)); }
const CPelUnitBuf Picture::getRecoBuf(bool wrap)                           const { return M_BUFS(scheduler.getSplitPicId(), wrap ? PIC_RECON_WRAP : (PictureType) (m_cleanDirtyFlag ? PIC_RECONSTRUCTION_1 : PIC_RECONSTRUCTION_0)); }
#else
       PelBuf     Picture::getRecoBuf(const ComponentID compID, bool wrap)       { return getBuf(compID,                    wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
const CPelBuf     Picture::getRecoBuf(const ComponentID compID, bool wrap) const { return getBuf(compID,                    wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
       PelBuf     Picture::getRecoBuf(const CompArea &blk, bool wrap)            { return getBuf(blk,                       wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
const CPelBuf     Picture::getRecoBuf(const CompArea &blk, bool wrap)      const { return getBuf(blk,                       wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
       PelUnitBuf Picture::getRecoBuf(const UnitArea &unit, bool wrap)           { return getBuf(unit,                      wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
const CPelUnitBuf Picture::getRecoBuf(const UnitArea &unit, bool wrap)     const { return getBuf(unit,                      wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
       PelUnitBuf Picture::getRecoBuf(bool wrap)                                 { return M_BUFS(scheduler.getSplitPicId(), wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
const CPelUnitBuf Picture::getRecoBuf(bool wrap)                           const { return M_BUFS(scheduler.getSplitPicId(), wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
#endif

void Picture::finalInit( const VPS* vps, const SPS& sps, const PPS& pps, PicHeader *picHeader, APS** alfApss, APS* lmcsAps, APS* scalingListAps )
{
  for( auto &sei : SEIs )
  {
    delete sei;
  }
  SEIs.clear();
  clearSliceBuffer();

  const ChromaFormat chromaFormatIDC = sps.getChromaFormatIdc();
  const int          iWidth = pps.getPicWidthInLumaSamples();
  const int          iHeight = pps.getPicHeightInLumaSamples();

  if( cs )
  {
    cs->initStructData();
    cs->sps = &sps; 
  }
  else
  {
    cs = new CodingStructure( g_globalUnitCache.cuCache, g_globalUnitCache.puCache, g_globalUnitCache.tuCache );
    cs->sps = &sps;
#if JVET_Z0118_GDR
    cs->create(chromaFormatIDC, Area(0, 0, iWidth, iHeight), true, (bool)sps.getPLTMode(), sps.getGDREnabledFlag());
#else
    cs->create(chromaFormatIDC, Area(0, 0, iWidth, iHeight), true, (bool)sps.getPLTMode());
#endif

  }

  cs->vps = vps;
  cs->picture = this;
  cs->slice   = nullptr;  // the slices for this picture have not been set at this point. update cs->slice after swapSliceObject()
  cs->pps     = &pps;

  picHeader->setSPSId( sps.getSPSId() );
  picHeader->setPPSId( pps.getPPSId() );

#if JVET_Z0118_GDR
  if (cs->isGdrEnabled())
  {
    setCleanDirty(false);

    picHeader->setPic(this);

    PicHeader *ph = new PicHeader;
    ph->initPicHeader();
    *ph = *picHeader;
    ph->setPic(this);

    if (cs->picHeader)
    {
      delete cs->picHeader;
      cs->picHeader = nullptr;
    }

    cs->picHeader = ph;
  }
  else
  {
    cs->picHeader = picHeader;
  }
#else
  cs->picHeader = picHeader;
#endif

  memcpy(cs->alfApss, alfApss, sizeof(cs->alfApss));
  cs->lmcsAps = lmcsAps;
  cs->scalinglistAps = scalingListAps;
  cs->pcv     = pps.pcv;
  m_conformanceWindow = pps.getConformanceWindow();
  m_scalingWindow = pps.getScalingWindow();

  if (m_spliceIdx == NULL)
  {
    m_ctuNums = cs->pcv->sizeInCtus;
    m_spliceIdx = new int[m_ctuNums];
    memset(m_spliceIdx, 0, m_ctuNums * sizeof(int));
  }
}

void Picture::allocateNewSlice()
{
  slices.push_back(new Slice);
  Slice& slice = *slices.back();
  memcpy(slice.getAlfAPSs(), cs->alfApss, sizeof(cs->alfApss));

  slice.setPPS( cs->pps);
  slice.setSPS( cs->sps);
  slice.setVPS( cs->vps);
  if(slices.size()>=2)
  {
    slice.copySliceInfo( slices[slices.size()-2] );
    slice.initSlice();
  }
}

void Picture::fillSliceLossyLosslessArray(std::vector<uint16_t> sliceLosslessIndexArray, bool mixedLossyLossless)
{
  uint16_t numElementsinsliceLosslessIndexArray = (uint16_t)sliceLosslessIndexArray.size();
  uint32_t numSlices = this->cs->pps->getNumSlicesInPic();
  m_lossylosslessSliceArray.assign(numSlices, true); // initialize to all slices are lossless 
  if (mixedLossyLossless)
  {
    m_lossylosslessSliceArray.assign(numSlices, false); // initialize to all slices are lossless 
    CHECK(numElementsinsliceLosslessIndexArray == 0 , "sliceLosslessArray is empty, must need to configure for mixed lossy/lossless");

    // mixed lossy/lossless slices, set only lossless slices;
    for (uint16_t i = 0; i < numElementsinsliceLosslessIndexArray; i++)
    {
        CHECK(sliceLosslessIndexArray[i] >= numSlices || sliceLosslessIndexArray[i] < 0, "index of lossless slice is out of slice index bound");
        m_lossylosslessSliceArray[sliceLosslessIndexArray[i]] = true;
    }
  } 
  CHECK(m_lossylosslessSliceArray.size() < numSlices, "sliceLosslessArray size is less than number of slices");
}

Slice *Picture::swapSliceObject(Slice * p, uint32_t i)
{
  p->setSPS(cs->sps);
  p->setPPS(cs->pps);
  p->setVPS(cs->vps);
  p->setAlfAPSs(cs->alfApss);


  Slice * pTmp = slices[i];
  slices[i] = p;
  pTmp->setSPS(0);
  pTmp->setPPS(0);
  pTmp->setVPS(0);
  memset(pTmp->getAlfAPSs(), 0, sizeof(*pTmp->getAlfAPSs())*ALF_CTB_MAX_NUM_APS);

  return pTmp;
}

void Picture::clearSliceBuffer()
{
  for (uint32_t i = 0; i < uint32_t(slices.size()); i++)
  {
    delete slices[i];
  }
  slices.clear();
}

#if ENABLE_SPLIT_PARALLELISM
void Picture::finishParallelPart( const UnitArea& area )
{
  const UnitArea clipdArea = clipArea( area, *this );
  const int      sourceID  = scheduler.getSplitPicId( 0 );
  CHECK( scheduler.getSplitJobId() > 0, "Finish-CU cannot be called from within a mode- or split-parallelized block!" );

  // distribute the reconstruction across all of the parallel workers
  for( int tId = 1; tId < scheduler.getNumSplitThreads(); tId++ )
  {
    const int destID = scheduler.getSplitPicId( tId );

    M_BUFS( destID, PIC_RECONSTRUCTION ).subBuf( clipdArea ).copyFrom( M_BUFS( sourceID, PIC_RECONSTRUCTION ).subBuf( clipdArea ) );
  }
}
#endif

const TFilterCoeff DownsamplingFilterSRC[8][16][12] =
{
    { // D = 1
      {   0,   0,   0,   0,   0, 128,   0,   0,   0,   0,   0,   0 },
      {   0,   0,   0,   2,  -6, 127,   7,  -2,   0,   0,   0,   0 },
      {   0,   0,   0,   3, -12, 125,  16,  -5,   1,   0,   0,   0 },
      {   0,   0,   0,   4, -16, 120,  26,  -7,   1,   0,   0,   0 },
      {   0,   0,   0,   5, -18, 114,  36, -10,   1,   0,   0,   0 },
      {   0,   0,   0,   5, -20, 107,  46, -12,   2,   0,   0,   0 },
      {   0,   0,   0,   5, -21,  99,  57, -15,   3,   0,   0,   0 },
      {   0,   0,   0,   5, -20,  89,  68, -18,   4,   0,   0,   0 },
      {   0,   0,   0,   4, -19,  79,  79, -19,   4,   0,   0,   0 },
      {   0,   0,   0,   4, -18,  68,  89, -20,   5,   0,   0,   0 },
      {   0,   0,   0,   3, -15,  57,  99, -21,   5,   0,   0,   0 },
      {   0,   0,   0,   2, -12,  46, 107, -20,   5,   0,   0,   0 },
      {   0,   0,   0,   1, -10,  36, 114, -18,   5,   0,   0,   0 },
      {   0,   0,   0,   1,  -7,  26, 120, -16,   4,   0,   0,   0 },
      {   0,   0,   0,   1,  -5,  16, 125, -12,   3,   0,   0,   0 },
      {   0,   0,   0,   0,  -2,   7, 127,  -6,   2,   0,   0,   0 }
    },
    { // D = 1.5
#if JVET_AD0169_SMALL_SCALE_DOWNSAMPLING
      {   0,   0,   4, -14,  27,  94,  27, -14,   4,   0,   0,   0 },
      {   0,   0,   4, -13,  21,  94,  32, -14,   3,   1,   0,   0 },
      {   0,   0,   4, -12,  16,  93,  39, -15,   3,   1,  -1,   0 },
      {   0,   0,   4, -11,  11,  92,  45, -15,   2,   1,  -1,   0 },
      {   0,  -1,   4, -10,   7,  89,  51, -14,   1,   2,  -1,   0 },
      {   0,  -1,   4,  -8,   2,  86,  57, -13,   0,   2,  -1,   0 },
      {   0,  -1,   4,  -7,  -1,  82,  63, -12,  -1,   2,  -1,   0 },
      {   0,  -1,   4,  -5,  -5,  78,  68, -10,  -3,   3,  -1,   0 },
      {   0,  -1,   3,  -4,  -8,  74,  74,  -8,  -4,   3,  -1,   0 },
      {   0,  -1,   3,  -3, -10,  68,  78,  -5,  -5,   4,  -1,   0 },
      {   0,  -1,   2,  -1, -12,  63,  82,  -1,  -7,   4,  -1,   0 },
      {   0,  -1,   2,   0, -13,  57,  86,   2,  -8,   4,  -1,   0 },
      {   0,  -1,   2,   1, -14,  51,  89,   7, -10,   4,  -1,   0 },
      {   0,  -1,   1,   2, -15,  45,  92,  11, -11,   4,   0,   0 },
      {   0,  -1,   1,   3, -15,  39,  93,  16, -12,   4,   0,   0 },
      {   0,   0,   1,   3, -14,  32,  94,  21, -13,   4,   0,   0 }
#else
      {   0,   2,   0, -14,  33,  86,  33, -14,   0,   2,   0,   0 },
      {   0,   1,   1, -14,  29,  85,  38, -13,  -1,   2,   0,   0 },
      {   0,   1,   2, -14,  24,  84,  43, -12,  -2,   2,   0,   0 },
      {   0,   1,   2, -13,  19,  83,  48, -11,  -3,   2,   0,   0 },
      {   0,   0,   3, -13,  15,  81,  53, -10,  -4,   3,   0,   0 },
      {   0,   0,   3, -12,  11,  79,  57,  -8,  -5,   3,   0,   0 },
      {   0,   0,   3, -11,   7,  76,  62,  -5,  -7,   3,   0,   0 },
      {   0,   0,   3, -10,   3,  73,  65,  -2,  -7,   3,   0,   0 },
      {   0,   0,   3,  -9,   0,  70,  70,   0,  -9,   3,   0,   0 },
      {   0,   0,   3,  -7,  -2,  65,  73,   3, -10,   3,   0,   0 },
      {   0,   0,   3,  -7,  -5,  62,  76,   7, -11,   3,   0,   0 },
      {   0,   0,   3,  -5,  -8,  57,  79,  11, -12,   3,   0,   0 },
      {   0,   0,   3,  -4, -10,  53,  81,  15, -13,   3,   0,   0 },
      {   0,   0,   2,  -3, -11,  48,  83,  19, -13,   2,   1,   0 },
      {   0,   0,   2,  -2, -12,  43,  84,  24, -14,   2,   1,   0 },
      {   0,   0,   2,  -1, -13,  38,  85,  29, -14,   1,   1,   0 }
#endif
    },
    { // D = 2
      {   0,   5,   -6,  -10,  37,  76,   37,  -10,  -6,    5,  0,   0}, //0
      {   0,   5,   -4,  -11,  33,  76,   40,  -9,    -7,    5,  0,   0}, //1
      //{   0,   5,   -3,  -12,  28,  75,   44,  -7,    -8,    5,  1,   0}, //2
      {  -1,   5,   -3,  -12,  29,  75,   45,  -7,    -8,   5,  0,   0}, //2 new coefficients in m24499
      {  -1,   4,   -2,  -13,  25,  75,   48,  -5,    -9,    5,  1,   0}, //3
      {  -1,   4,   -1,  -13,  22,  73,   52,  -3,    -10,  4,  1,   0}, //4
      {  -1,   4,   0,    -13,  18,  72,   55,  -1,    -11,  4,  2,  -1}, //5
      {  -1,   4,   1,    -13,  14,  70,   59,  2,    -12,  3,  2,  -1}, //6
      {  -1,   3,   1,    -13,  11,  68,   62,  5,    -12,  3,  2,  -1}, //7
      {  -1,   3,   2,    -13,  8,  65,   65,  8,    -13,  2,  3,  -1}, //8
      {  -1,   2,   3,    -12,  5,  62,   68,  11,    -13,  1,  3,  -1}, //9
      {  -1,   2,   3,    -12,  2,  59,   70,  14,    -13,  1,  4,  -1}, //10
      {  -1,   2,   4,    -11,  -1,  55,   72,  18,    -13,  0,  4,  -1}, //11
      {   0,   1,   4,    -10,  -3,  52,   73,  22,    -13,  -1,  4,  -1}, //12
      {   0,   1,   5,    -9,    -5,  48,   75,  25,    -13,  -2,  4,  -1}, //13
      //{   0,   1,   5,    -8,    -7,  44,   75,  28,    -12,  -3,  5,   0}, //14
      {    0,   0,   5,    -8,   -7,  45,   75,  29,    -12,  -3,  5,  -1}  , //14 new coefficients in m24499
      {   0,   0,   5,    -7,    -9,  40,   76,  33,    -11,  -4,  5,   0}, //15
    },
    { // D = 2.5
      {   2,  -3,   -9,  6,   39,  58,   39,  6,   -9,  -3,    2,    0}, // 0
      {   2,  -3,   -9,  4,   38,  58,   43,  7,   -9,  -4,    1,    0}, // 1
      {   2,  -2,   -9,  2,   35,  58,   44,  9,   -8,  -4,    1,    0}, // 2
      {   1,  -2,   -9,  1,   34,  58,   46,  11,   -8,  -5,    1,    0}, // 3
      //{   1,  -1,   -8,  -1,   31,  57,   48,  13,   -8,  -5,    1,    0}, // 4
      {   1,  -1,   -8,  -1,   31,  57,   47,  13,   -7,  -5,    1,    0},  // 4 new coefficients in m24499
      {   1,  -1,   -8,  -2,   29,  56,   49,  15,   -7,  -6,    1,    1}, // 5
      {   1,  0,   -8,  -3,   26,  55,   51,  17,   -7,  -6,    1,    1}, // 6
      {   1,  0,   -7,  -4,   24,  54,   52,  19,   -6,  -7,    1,    1}, // 7
      {   1,  0,   -7,  -5,   22,  53,   53,  22,   -5,  -7,    0,    1}, // 8
      {   1,  1,   -7,  -6,   19,  52,   54,  24,   -4,  -7,    0,    1}, // 9
      {   1,  1,   -6,  -7,   17,  51,   55,  26,   -3,  -8,    0,    1}, // 10
      {   1,  1,   -6,  -7,   15,  49,   56,  29,   -2,  -8,    -1,    1}, // 11
      //{   0,  1,   -5,  -8,   13,  48,   57,  31,   -1,  -8,    -1,    1}, // 12 new coefficients in m24499
      {   0,  1,   -5,  -7,   13,  47,  57,  31,  -1,    -8,   -1,    1}, // 12
      {   0,  1,   -5,  -8,   11,  46,   58,  34,   1,    -9,    -2,    1}, // 13
      {   0,  1,   -4,  -8,   9,    44,   58,  35,   2,    -9,    -2,    2}, // 14
      {   0,  1,   -4,  -9,   7,    43,   58,  38,   4,    -9,    -3,    2}, // 15
    },
    { // D = 3
      {  -2,  -7,   0,  17,  35,  43,  35,  17,   0,  -7,  -5,   2 },
      {  -2,  -7,  -1,  16,  34,  43,  36,  18,   1,  -7,  -5,   2 },
      {  -1,  -7,  -1,  14,  33,  43,  36,  19,   1,  -6,  -5,   2 },
      {  -1,  -7,  -2,  13,  32,  42,  37,  20,   3,  -6,  -5,   2 },
      {   0,  -7,  -3,  12,  31,  42,  38,  21,   3,  -6,  -5,   2 },
      {   0,  -7,  -3,  11,  30,  42,  39,  23,   4,  -6,  -6,   1 },
      {   0,  -7,  -4,  10,  29,  42,  40,  24,   5,  -6,  -6,   1 },
      {   1,  -7,  -4,   9,  27,  41,  40,  25,   6,  -5,  -6,   1 },
      {   1,  -6,  -5,   7,  26,  41,  41,  26,   7,  -5,  -6,   1 },
      {   1,  -6,  -5,   6,  25,  40,  41,  27,   9,  -4,  -7,   1 },
      {   1,  -6,  -6,   5,  24,  40,  42,  29,  10,  -4,  -7,   0 },
      {   1,  -6,  -6,   4,  23,  39,  42,  30,  11,  -3,  -7,   0 },
      {   2,  -5,  -6,   3,  21,  38,  42,  31,  12,  -3,  -7,   0 },
      {   2,  -5,  -6,   3,  20,  37,  42,  32,  13,  -2,  -7,  -1 },
      {   2,  -5,  -6,   1,  19,  36,  43,  33,  14,  -1,  -7,  -1 },
      {   2,  -5,  -7,   1,  18,  36,  43,  34,  16,  -1,  -7,  -2 }
    },
    { // D = 3.5
      {  -6,  -3,   5,  19,  31,  36,  31,  19,   5,  -3,  -6,   0 },
      {  -6,  -4,   4,  18,  31,  37,  32,  20,   6,  -3,  -6,  -1 },
      {  -6,  -4,   4,  17,  30,  36,  33,  21,   7,  -3,  -6,  -1 },
      {  -5,  -5,   3,  16,  30,  36,  33,  22,   8,  -2,  -6,  -2 },
      {  -5,  -5,   2,  15,  29,  36,  34,  23,   9,  -2,  -6,  -2 },
      {  -5,  -5,   2,  15,  28,  36,  34,  24,  10,  -2,  -6,  -3 },
      {  -4,  -5,   1,  14,  27,  36,  35,  24,  10,  -1,  -6,  -3 },
      {  -4,  -5,   0,  13,  26,  35,  35,  25,  11,   0,  -5,  -3 },
      {  -4,  -6,   0,  12,  26,  36,  36,  26,  12,   0,  -6,  -4 },
      {  -3,  -5,   0,  11,  25,  35,  35,  26,  13,   0,  -5,  -4 },
      {  -3,  -6,  -1,  10,  24,  35,  36,  27,  14,   1,  -5,  -4 },
      {  -3,  -6,  -2,  10,  24,  34,  36,  28,  15,   2,  -5,  -5 },
      {  -2,  -6,  -2,   9,  23,  34,  36,  29,  15,   2,  -5,  -5 },
      {  -2,  -6,  -2,   8,  22,  33,  36,  30,  16,   3,  -5,  -5 },
      {  -1,  -6,  -3,   7,  21,  33,  36,  30,  17,   4,  -4,  -6 },
      {  -1,  -6,  -3,   6,  20,  32,  37,  31,  18,   4,  -4,  -6 }
    },
    { // D = 4
      {  -9,   0,   9,  20,  28,  32,  28,  20,   9,   0,  -9,   0 },
      {  -9,   0,   8,  19,  28,  32,  29,  20,  10,   0,  -4,  -5 },
      {  -9,  -1,   8,  18,  28,  32,  29,  21,  10,   1,  -4,  -5 },
      {  -9,  -1,   7,  18,  27,  32,  30,  22,  11,   1,  -4,  -6 },
      {  -8,  -2,   6,  17,  27,  32,  30,  22,  12,   2,  -4,  -6 },
      {  -8,  -2,   6,  16,  26,  32,  31,  23,  12,   2,  -4,  -6 },
      {  -8,  -2,   5,  16,  26,  31,  31,  23,  13,   3,  -3,  -7 },
      {  -8,  -3,   5,  15,  25,  31,  31,  24,  14,   4,  -3,  -7 },
      {  -7,  -3,   4,  14,  25,  31,  31,  25,  14,   4,  -3,  -7 },
      {  -7,  -3,   4,  14,  24,  31,  31,  25,  15,   5,  -3,  -8 },
      {  -7,  -3,   3,  13,  23,  31,  31,  26,  16,   5,  -2,  -8 },
      {  -6,  -4,   2,  12,  23,  31,  32,  26,  16,   6,  -2,  -8 },
      {  -6,  -4,   2,  12,  22,  30,  32,  27,  17,   6,  -2,  -8 },
      {  -6,  -4,   1,  11,  22,  30,  32,  27,  18,   7,  -1,  -9 },
      {  -5,  -4,   1,  10,  21,  29,  32,  28,  18,   8,  -1,  -9 },
      {  -5,  -4,   0,  10,  20,  29,  32,  28,  19,   8,   0,  -9 }
    },
    { // D = 5.5
      {  -8,   7,  13,  18,  22,  24,  22,  18,  13,   7,   2, -10 },
      {  -8,   7,  13,  18,  22,  23,  22,  19,  13,   7,   2, -10 },
      {  -8,   6,  12,  18,  22,  23,  22,  19,  14,   8,   2, -10 },
      {  -9,   6,  12,  17,  22,  23,  23,  19,  14,   8,   3, -10 },
      {  -9,   6,  12,  17,  21,  23,  23,  19,  14,   9,   3, -10 },
      {  -9,   5,  11,  17,  21,  23,  23,  20,  15,   9,   3, -10 },
      {  -9,   5,  11,  16,  21,  23,  23,  20,  15,   9,   4, -10 },
      {  -9,   5,  10,  16,  21,  23,  23,  20,  15,  10,   4, -10 },
      { -10,   5,  10,  16,  20,  23,  23,  20,  16,  10,   5, -10 },
      { -10,   4,  10,  15,  20,  23,  23,  21,  16,  10,   5,  -9 },
      { -10,   4,   9,  15,  20,  23,  23,  21,  16,  11,   5,  -9 },
      { -10,   3,   9,  15,  20,  23,  23,  21,  17,  11,   5,  -9 },
      { -10,   3,   9,  14,  19,  23,  23,  21,  17,  12,   6,  -9 },
      { -10,   3,   8,  14,  19,  23,  23,  22,  17,  12,   6,  -9 },
      { -10,   2,   8,  14,  19,  22,  23,  22,  18,  12,   6,  -8 },
      { -10,   2,   7,  13,  19,  22,  23,  22,  18,  13,   7,  -8 }
    }
};

#if JVET_AB0082
const TFilterCoeff m_lumaFilter12_alt[16][12] =
{
{ 0, 0, 0, 0, 0, 256, 0, 0, 0, 0, 0, 0, },
{ 1, -1, 0, 3, -12, 253, 16, -6, 2, 0, 0, 0, },
{ 0, 0, -3, 9, -24, 250, 32, -11, 4, -1, 0, 0, },
{ 0, 0, -4, 12, -32, 241, 52, -18, 8, -4, 2, -1, },
{ 0, 1, -6, 15, -38, 228, 75, -28, 14, -7, 3, -1, },
{ 0, 1, -7, 18, -43, 214, 96, -33, 16, -8, 3, -1, },
{ 1, 0, -6, 17, -44, 196, 119, -40, 20, -10, 4, -1, },
{ 0, 2, -9, 21, -47, 180, 139, -43, 20, -10, 4, -1, },
{ -1, 3, -9, 21, -46, 160, 160, -46, 21, -9, 3, -1, },
{ -1, 4, -10, 20, -43, 139, 180, -47, 21, -9, 2, 0, },
{ -1, 4, -10, 20, -40, 119, 196, -44, 17, -6, 0, 1, },
{ -1, 3, -8, 16, -33, 96, 214, -43, 18, -7, 1, 0, },
{ -1, 3, -7, 14, -28, 75, 228, -38, 15, -6, 1, 0, },
{ -1, 2, -4, 8, -18, 52, 241, -32, 12, -4, 0, 0, },
{ 0, 0, -1, 4, -11, 32, 250, -24, 9, -3, 0, 0, },
{ 0, 0, 0, 2, -6, 16, 253, -12, 3, 0, -1, 1, },
};
const TFilterCoeff m_chromaFilter6_alt[32][6] =
{
{0, 0, 256, 0, 0, 0, },
{ 1, -6, 256, 6, -1, 0, },
{ 2, -11, 254, 14, -4, 1, },
{ 4, -18, 252, 23, -6, 1, },
{ 6, -24, 249, 32, -9, 2, },
{ 6, -26, 244, 41, -12, 3, },
{ 7, -30, 239, 53, -18, 5, },
{ 8, -34, 235, 61, -19, 5, },
{ 10, -38, 228, 72, -22, 6, },
{ 10, -39, 220, 84, -26, 7, },
{ 10, -40, 213, 94, -29, 8, },
{ 11, -42, 205, 105, -32, 9, },
{ 11, -42, 196, 116, -35, 10, },
{ 11, -42, 186, 128, -37, 10, },
{ 11, -42, 177, 138, -38, 10, },
{ 11, -41, 167, 148, -40, 11, },
{ 11, -41, 158, 158, -41, 11, },
{ 11, -40, 148, 167, -41, 11, },
{ 10, -38, 138, 177, -42, 11, },
{ 10, -37, 128, 186, -42, 11, },
{ 10, -35, 116, 196, -42, 11, },
{ 9, -32, 105, 205, -42, 11, },
{ 8, -29, 94, 213, -40, 10, },
{ 7, -26, 84, 220, -39, 10, },
{ 6, -22, 72, 228, -38, 10, },
{ 5, -19, 61, 235, -34, 8, },
{ 5, -18, 53, 239, -30, 7, },
{ 3, -12, 41, 244, -26, 6, },
{ 2, -9, 32, 249, -24, 6, },
{ 1, -6, 23, 252, -18, 4, },
{ 1, -4, 14, 254, -11, 2, },
{ 0, -1, 6, 256, -6, 1, }
};
#endif
void Picture::sampleRateConv( const std::pair<int, int> scalingRatio, const std::pair<int, int> compScale,
                              const CPelBuf& beforeScale, const int beforeScaleLeftOffset, const int beforeScaleTopOffset,
                              const PelBuf& afterScale, const int afterScaleLeftOffset, const int afterScaleTopOffset,
                              const int bitDepth, const bool useLumaFilter, const bool downsampling,
                              const bool horCollocatedPositionFlag, const bool verCollocatedPositionFlag
#if JVET_AB0082
                              , const bool rescaleForDisplay, const int upscaleFilterForDisplay
#endif
)
{
  const Pel* orgSrc = beforeScale.buf;
  const int orgWidth = beforeScale.width;
  const int orgHeight = beforeScale.height;
  const int orgStride = beforeScale.stride;

  Pel* scaledSrc = afterScale.buf;
  const int scaledWidth = afterScale.width;
  const int scaledHeight = afterScale.height;
  const int scaledStride = afterScale.stride;

  if( orgWidth == scaledWidth && orgHeight == scaledHeight && scalingRatio == SCALE_1X && !beforeScaleLeftOffset && !beforeScaleTopOffset && !afterScaleLeftOffset && !afterScaleTopOffset )
  {
    for( int j = 0; j < orgHeight; j++ )
    {
      memcpy( scaledSrc + j * scaledStride, orgSrc + j * orgStride, sizeof( Pel ) * orgWidth );
    }

    return;
  }

#if JVET_AB0082
  const TFilterCoeff* filterHor = useLumaFilter ? &InterpolationFilter::m_lumaFilter12[0][0] : &InterpolationFilter::m_chromaFilter[0][0];
  const TFilterCoeff* filterVer = useLumaFilter ? &InterpolationFilter::m_lumaFilter12[0][0] : &InterpolationFilter::m_chromaFilter[0][0];
  if (rescaleForDisplay)
  {
    if (upscaleFilterForDisplay != 2)
    {
      filterHor = useLumaFilter ? (upscaleFilterForDisplay == 1 ? &m_lumaFilter12_alt[0][0] : &InterpolationFilter::m_lumaFilter[0][0]) : (upscaleFilterForDisplay == 1 ? &m_chromaFilter6_alt[0][0] : &InterpolationFilter::m_chromaFilter4[0][0]);
      filterVer = useLumaFilter ? (upscaleFilterForDisplay == 1 ? &m_lumaFilter12_alt[0][0] : &InterpolationFilter::m_lumaFilter[0][0]) : (upscaleFilterForDisplay == 1 ? &m_chromaFilter6_alt[0][0] : &InterpolationFilter::m_chromaFilter4[0][0]);
    }
   }
#else
  const TFilterCoeff* filterHor = useLumaFilter ? &InterpolationFilter::m_lumaFilter[0][0] : &InterpolationFilter::m_chromaFilter[0][0];
  const TFilterCoeff* filterVer = useLumaFilter ? &InterpolationFilter::m_lumaFilter[0][0] : &InterpolationFilter::m_chromaFilter[0][0];
#endif
  const int numFracPositions = useLumaFilter ? 15 : 31;
  const int numFracShift = useLumaFilter ? 4 : 5;
  const int posShiftX = SCALE_RATIO_BITS - numFracShift + compScale.first;
  const int posShiftY = SCALE_RATIO_BITS - numFracShift + compScale.second;
  int addX = ( 1 << ( posShiftX - 1 ) ) + ( beforeScaleLeftOffset << SCALE_RATIO_BITS ) + ( ( int( 1 - horCollocatedPositionFlag ) * 8 * ( scalingRatio.first - SCALE_1X.first ) + ( 1 << ( 2 + compScale.first ) ) ) >> ( 3 + compScale.first ) );
  int addY = ( 1 << ( posShiftY - 1 ) ) + ( beforeScaleTopOffset << SCALE_RATIO_BITS ) + ( ( int( 1 - verCollocatedPositionFlag ) * 8 * ( scalingRatio.second - SCALE_1X.second ) + ( 1 << ( 2 + compScale.second ) ) ) >> ( 3 + compScale.second ) );

  if( downsampling )
  {
    int verFilter = 0;
    int horFilter = 0;

    if (scalingRatio.first > (15 << SCALE_RATIO_BITS) / 4)
    {
      horFilter = 7;
    }
    else if (scalingRatio.first > (20 << SCALE_RATIO_BITS) / 7)
    {
      horFilter = 6;
    }
    else if (scalingRatio.first > (5 << SCALE_RATIO_BITS) / 2)
    {
      horFilter = 5;
    }
    else if (scalingRatio.first > (2 << SCALE_RATIO_BITS))
    {
      horFilter = 4;
    }
    else if (scalingRatio.first > (5 << SCALE_RATIO_BITS) / 3)
    {
      horFilter = 3;
    }
#if JVET_AD0169_SMALL_SCALE_DOWNSAMPLING
    else if (scalingRatio.first > (27 << SCALE_RATIO_BITS) / 20)
#else
    else if (scalingRatio.first > (5 << SCALE_RATIO_BITS) / 4)
#endif
    {
      horFilter = 2;
    }
#if JVET_AD0169_SMALL_SCALE_DOWNSAMPLING
    else if (scalingRatio.first > (11 << SCALE_RATIO_BITS) / 10)
#else
    else if (scalingRatio.first > (20 << SCALE_RATIO_BITS) / 19)
#endif
    {
      horFilter = 1;
    }

    if (scalingRatio.second > (15 << SCALE_RATIO_BITS) / 4)
    {
      verFilter = 7;
    }
    else if (scalingRatio.second > (20 << SCALE_RATIO_BITS) / 7)
    {
      verFilter = 6;
    }
    else if (scalingRatio.second > (5 << SCALE_RATIO_BITS) / 2)
    {
      verFilter = 5;
    }
    else if (scalingRatio.second > (2 << SCALE_RATIO_BITS))
    {
      verFilter = 4;
    }
    else if (scalingRatio.second > (5 << SCALE_RATIO_BITS) / 3)
    {
      verFilter = 3;
    }
#if JVET_AD0169_SMALL_SCALE_DOWNSAMPLING
    else if (scalingRatio.second > (27 << SCALE_RATIO_BITS) / 20)
#else
    else if (scalingRatio.second > (5 << SCALE_RATIO_BITS) / 4)
#endif
    {
      verFilter = 2;
    }
#if JVET_AD0169_SMALL_SCALE_DOWNSAMPLING
    else if (scalingRatio.second > (11 << SCALE_RATIO_BITS) / 10)
#else
    else if (scalingRatio.second > (20 << SCALE_RATIO_BITS) / 19)
#endif
    {
      verFilter = 1;
    }

    filterHor = &DownsamplingFilterSRC[horFilter][0][0];
    filterVer = &DownsamplingFilterSRC[verFilter][0][0];
  }
#if IF_12TAP
#if !RPR_ENABLE
  CHECK( true, "Called at un-handled point" );
#endif
#if JVET_AB0082
  int filterLengthsLuma[3] = { 8, 12, 12 };
  int filterLengthsChroma[3] = { 4, 6, 6 };
  const int filterLength = downsampling ? 12 : rescaleForDisplay ? (useLumaFilter ? filterLengthsLuma[upscaleFilterForDisplay] : filterLengthsChroma[upscaleFilterForDisplay]) : (useLumaFilter ? NTAPS_LUMA(0) : NTAPS_CHROMA);
#else
  const int filterLength = downsampling ? 12 : (useLumaFilter ? NTAPS_LUMA(1) : NTAPS_CHROMA);
#endif
#else
  const int filterLength = downsampling ? 12 : (useLumaFilter ? NTAPS_LUMA : NTAPS_CHROMA);
#endif
#if RPR_ENABLE && IF_12TAP
  const int log2Norm = downsampling ? 14 : 16;
#else
  const int log2Norm = downsampling ? 14 : 12;
#endif

  int *buf = new int[orgHeight * scaledWidth];
  int maxVal = ( 1 << bitDepth ) - 1;

  CHECK( bitDepth > 17, "Overflow may happen!" );

  for( int i = 0; i < scaledWidth; i++ )
  {
    const Pel* org = orgSrc;
    int refPos = ( ( ( i << compScale.first ) - afterScaleLeftOffset ) * scalingRatio.first + addX ) >> posShiftX;
    int integer = refPos >> numFracShift;
    int frac = refPos & numFracPositions;
    int* tmp = buf + i;

    for( int j = 0; j < orgHeight; j++ )
    {
      int sum = 0;
      const TFilterCoeff* f = filterHor + frac * filterLength;

      for( int k = 0; k < filterLength; k++ )
      {
        int xInt = std::min<int>( std::max( 0, integer + k - filterLength / 2 + 1 ), orgWidth - 1 );
        sum += f[k] * org[xInt]; // postpone horizontal filtering gain removal after vertical filtering
      }

      *tmp = sum;