/work/vvenc/source/Lib/EncoderLib/EncSlice.cpp

Source
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/** \file     EncSlice.cpp
    \brief    slice encoder class
*/

#include "EncSlice.h"
#include "EncStage.h"
#include "EncLib.h"
#include "EncPicture.h"
#include "BitAllocation.h"
#include "CommonLib/UnitTools.h"
#include "CommonLib/Picture.h"
#include "CommonLib/TimeProfiler.h"
#include "CommonLib/dtrace_codingstruct.h"
#include "Utilities/NoMallocThreadPool.h"

#include <math.h>
#include "vvenc/vvencCfg.h"

//! \ingroup EncoderLib
//! \{

namespace vvenc {

#ifdef TRACE_ENABLE_ITT
static const __itt_domain* itt_domain_encode              = __itt_domain_create( "Encode" );
static const __itt_string_handle* itt_handle_ctuEncode    = __itt_string_handle_create( "Encode_CTU" );
static const __itt_string_handle* itt_handle_rspLfVer     = __itt_string_handle_create( "RspLfVer_CTU" );
static const __itt_string_handle* itt_handle_lfHor        = __itt_string_handle_create( "LfHor_CTU" );
static const __itt_string_handle* itt_handle_sao          = __itt_string_handle_create( "SAO_CTU" );
static const __itt_string_handle* itt_handle_alf_stat     = __itt_string_handle_create( "ALF_CTU_STAT" );
static const __itt_string_handle* itt_handle_alf_derive   = __itt_string_handle_create( "ALF_DERIVE" );
static const __itt_string_handle* itt_handle_alf_recon    = __itt_string_handle_create( "ALF_RECONSTRUCT" );
static const __itt_string_handle* itt_handle_ccalf_stat   = __itt_string_handle_create( "CCALF_CTU_STAT" );
static const __itt_string_handle* itt_handle_ccalf_derive = __itt_string_handle_create( "CCALF_DERIVE" );
static const __itt_string_handle* itt_handle_ccalf_recon  = __itt_string_handle_create( "CCALF_RECONSTRUCT" );
#endif

void setArbitraryWppPattern( const PreCalcValues& pcv, std::vector<int>& ctuAddrMap, int stepX = 1 )
{
  ctuAddrMap.resize( pcv.sizeInCtus, 0 );
  std::vector<int> x_in_line( pcv.heightInCtus, 0 );
  int x = 0, y = 0, addr = 0;
  int y_top = 0;
  const int step = stepX; // number of CTUs in x-direction to scan 
  ctuAddrMap[addr++] = x++; // first entry (can be omitted)
  while( addr < pcv.sizeInCtus )
  {
    // fill entries in x-direction
    int x1 = x;
    while( x < std::min(x1 + step, (int)pcv.widthInCtus) )
    {
      // general WPP condition (top-right CTU availability)
      if( y > 0 && !( x_in_line[y - 1] - x >= 2 ) && x != pcv.widthInCtus - 1 )
        break;
      ctuAddrMap[addr++] = y*pcv.widthInCtus + x;
      x++;
    }
    x_in_line[y] = x;
        
    y += 1;

    if( y >= pcv.heightInCtus )
    {
      // go up
      if( x_in_line[y_top] >= pcv.widthInCtus )
      {
        y_top++;
        if( y_top >= pcv.heightInCtus )
        {
          // done
          break;
        }
      }
      y = y_top;
    }
    x = x_in_line[y];

    CHECK( y >= pcv.heightInCtus, "Height in CTUs is exceeded" );
  }
}

struct TileLineEncRsrc
{
  BitEstimator            m_BitEstimator;
  CABACWriter             m_CABACEstimator;
  BitEstimator            m_SaoBitEstimator;
  CABACWriter             m_SaoCABACEstimator;
  BitEstimator            m_AlfBitEstimator;
  CABACWriter             m_AlfCABACEstimator;
  ReuseUniMv              m_ReuseUniMv;
  BlkUniMvInfoBuffer      m_BlkUniMvInfoBuffer;
  AffineProfList          m_AffineProfList;
  IbcBvCand               m_CachedBvs;
  EncSampleAdaptiveOffset m_encSao;
  int                     m_prevQp[ MAX_NUM_CH ];
  TileLineEncRsrc( const VVEncCfg& encCfg ) : m_CABACEstimator( m_BitEstimator ), m_SaoCABACEstimator( m_SaoBitEstimator ), m_AlfCABACEstimator( m_AlfBitEstimator ) { m_AffineProfList.init( ! encCfg.m_picReordering ); }
};

struct PerThreadRsrc
{
  CtxCache  m_CtxCache;
  EncCu     m_encCu;
  PelStorage m_alfTempCtuBuf;
};

struct CtuEncParam
{
  Picture*  pic;
  EncSlice* encSlice;
  int       ctuRsAddr;
  int       ctuPosX;
  int       ctuPosY;
  UnitArea  ctuArea;
  int       tileLineResIdx;

  CtuEncParam() : pic( nullptr ), encSlice( nullptr ), ctuRsAddr( 0 ), ctuPosX( 0 ), ctuPosY( 0 ), ctuArea(), tileLineResIdx( 0 ) {}
  CtuEncParam( Picture* _p, EncSlice* _s, const int _r, const int _x, const int _y, const int _tileLineResIdx )
    : pic( _p )
    , encSlice( _s )
    , ctuRsAddr( _r )
    , ctuPosX( _x )
    , ctuPosY( _y )
    , ctuArea( pic->chromaFormat, pic->slices[0]->pps->pcv->getCtuArea( _x, _y ) )
    , tileLineResIdx( _tileLineResIdx ) {}
};

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

EncSlice::EncSlice()
  : m_pcEncCfg           ( nullptr)
  , m_threadPool         ( nullptr )
  , m_ctuTasksDoneCounter( nullptr )
  , m_ctuEncDelay        ( 1 )
  , m_pLoopFilter        ( nullptr )
  , m_pALF               ( nullptr )
  , m_pcRateCtrl         ( nullptr )
  , m_CABACWriter        ( m_BinEncoder )
  , m_encCABACTableIdx   ( VVENC_I_SLICE )
{
}


EncSlice::~EncSlice()
{
  for( auto* lnRsc : m_TileLineEncRsrc )
  {
    delete lnRsc;
  }
  m_TileLineEncRsrc.clear();

  for( auto* taskRsc: m_ThreadRsrc )
  {
    taskRsc->m_alfTempCtuBuf.destroy();
    delete taskRsc;
  }
  m_ThreadRsrc.clear();

  m_saoReconParams.clear();

  for( int i = 0; i < m_saoStatData.size(); i++ )
  {
    for( int compIdx = 0; compIdx < MAX_NUM_COMP; compIdx++ )
    {
      delete[] m_saoStatData[ i ][ compIdx ];
    }
    delete[] m_saoStatData[ i ];
  }
  m_saoStatData.clear();
}

void EncSlice::init( const VVEncCfg& encCfg,
                     const SPS& sps,
                     const PPS& pps,
                     std::vector<int>* const globalCtuQpVector,
                     LoopFilter& loopFilter,
                     EncAdaptiveLoopFilter& alf,
                     RateCtrl& rateCtrl,
                     NoMallocThreadPool* threadPool,
                     WaitCounter* ctuTasksDoneCounter )
{
  m_pcEncCfg            = &encCfg;
  m_pLoopFilter         = &loopFilter;
  m_pALF                = &alf;
  m_pcRateCtrl          = &rateCtrl;
  m_threadPool          = threadPool;
  m_ctuTasksDoneCounter = ctuTasksDoneCounter;
  m_syncPicCtx.resize( encCfg.m_entropyCodingSyncEnabled ? pps.getNumTileLineIds() : 0 );

  
  const int maxCntRscr = ( encCfg.m_numThreads > 0 ) ? pps.getNumTileLineIds() : 1;
  const int maxCtuEnc  = ( encCfg.m_numThreads > 0 && threadPool ) ? threadPool->numThreads() : 1;

  m_ThreadRsrc.resize( maxCtuEnc,  nullptr );
  m_TileLineEncRsrc.resize( maxCntRscr, nullptr );

  for( PerThreadRsrc*& taskRsc : m_ThreadRsrc )
  {
    taskRsc = new PerThreadRsrc();
    taskRsc->m_encCu.init( encCfg,
                           sps,
                           globalCtuQpVector,
                           m_syncPicCtx.data(),
                           &rateCtrl );
    taskRsc->m_alfTempCtuBuf.create( pps.pcv->chrFormat, Area( 0, 0, pps.pcv->maxCUSize + (MAX_ALF_PADDING_SIZE << 1), pps.pcv->maxCUSize + (MAX_ALF_PADDING_SIZE << 1) ), pps.pcv->maxCUSize, MAX_ALF_PADDING_SIZE, 0, false );
  }

  for( TileLineEncRsrc*& lnRsc : m_TileLineEncRsrc )
  {
    lnRsc = new TileLineEncRsrc( encCfg );
    if( sps.saoEnabled )
    {
      lnRsc->m_encSao.init( encCfg );
    }
  }

  const int sizeInCtus = pps.pcv->sizeInCtus;
  m_processStates = std::vector<ProcessCtuState>( sizeInCtus );
  m_saoReconParams.resize( sizeInCtus );

  ::memset( m_saoDisabledRate, 0, sizeof( m_saoDisabledRate ) );

  // sao statistics
  if( encCfg.m_bUseSAO )
  {
    m_saoStatData.resize( sizeInCtus );
    for( int i = 0; i < sizeInCtus; i++ )
    {
      m_saoStatData[ i ] = new SAOStatData*[ MAX_NUM_COMP ];
      for( int compIdx = 0; compIdx < MAX_NUM_COMP; compIdx++ )
      {
        m_saoStatData[ i ][ compIdx ] = new SAOStatData[ NUM_SAO_NEW_TYPES ];
      }
    }
  }
  ctuEncParams.resize( sizeInCtus );
  setArbitraryWppPattern( *pps.pcv, m_ctuAddrMap, 3 );

  const unsigned asuHeightInCtus = m_pALF->getAsuHeightInCtus();
  const unsigned numDeriveLines  = encCfg.m_ifpLines ? 
    std::min( ((encCfg.m_ifpLines & (~(asuHeightInCtus - 1))) + asuHeightInCtus), pps.pcv->heightInCtus ) : pps.pcv->heightInCtus;
  m_alfDeriveCtu  = numDeriveLines * pps.pcv->widthInCtus - 1;
  m_ccalfDeriveCtu = encCfg.m_ifpLines ? pps.pcv->widthInCtus * std::min((unsigned)encCfg.m_ifpLines + 1, pps.pcv->heightInCtus) - 1: pps.pcv->sizeInCtus - 1;
}


void EncSlice::initPic( Picture* pic )
{
  Slice* slice = pic->cs->slice;

  if( slice->pps->numTileCols * slice->pps->numTileRows > 1 )
  {
    slice->sliceMap = slice->pps->sliceMap[0];
  }
  else
  {
    slice->sliceMap.addCtusToSlice( 0, pic->cs->pcv->widthInCtus, 0, pic->cs->pcv->heightInCtus, pic->cs->pcv->widthInCtus);
  }

  // this ensures that independently encoded bitstream chunks can be combined to bit-equal
  const SliceType cabacTableIdx = ! slice->pps->cabacInitPresent || slice->pendingRasInit ? slice->sliceType : m_encCABACTableIdx;
  slice->encCABACTableIdx = cabacTableIdx;

  // set QP and lambda values
  xInitSliceLambdaQP( slice );

  for( auto* thrRsc : m_ThreadRsrc )
  {
    thrRsc->m_encCu.initPic( pic );
  }

  for( auto* lnRsc : m_TileLineEncRsrc )
  {
    lnRsc->m_ReuseUniMv.resetReusedUniMvs();
  }

  m_ctuEncDelay = 1;
  if( pic->useIBC )
  {
    // IBC needs unfiltered samples up to max IBC search range
    // therefore ensure that numCtuDelayLUT CTU's have been enocded first
    // assuming IBC localSearchRangeX / Y = 128
    const int numCtuDelayLUT[ 3 ] = { 15, 3, 1 };
    CHECK( pic->cs->pcv->maxCUSizeLog2 < 5 || pic->cs->pcv->maxCUSizeLog2 > 7, "invalid max CTUSize" );
    m_ctuEncDelay = numCtuDelayLUT[ pic->cs->pcv->maxCUSizeLog2 - 5 ];
  }
}



void EncSlice::xInitSliceLambdaQP( Slice* slice )
{
  // pre-compute lambda and QP
  const bool rcp = (m_pcEncCfg->m_RCTargetBitrate > 0 && slice->pic->picInitialQP >= 0); // 2nd pass
  int  iQP = Clip3 (-slice->sps->qpBDOffset[CH_L], MAX_QP, slice->pic->picInitialQP); // RC start QP
  double dQP     = (rcp ? (double) slice->pic->picInitialQP : xGetQPForPicture (slice));
  double dLambda = (rcp ? slice->pic->picInitialLambda : xCalculateLambda (slice, slice->TLayer, dQP, dQP, iQP));
  int sliceChromaQpOffsetIntraOrPeriodic[2] = { m_pcEncCfg->m_sliceChromaQpOffsetIntraOrPeriodic[0], m_pcEncCfg->m_sliceChromaQpOffsetIntraOrPeriodic[1] };
  const int lookAheadRCCQpOffset = 0;   // was (m_pcEncCfg->m_RCTargetBitrate > 0 && m_pcEncCfg->m_LookAhead && CS::isDualITree (*slice->pic->cs) ? 1 : 0);
  int cbQP = 0, crQP = 0, cbCrQP = 0;

  if (m_pcEncCfg->m_usePerceptQPA) // adapt sliceChromaQpOffsetIntraOrPeriodic and pic->ctuAdaptedQP
  {
    const bool cqp = (slice->isIntra() && !slice->sps->IBC) || (m_pcEncCfg->m_sliceChromaQpOffsetPeriodicity > 0 && (slice->poc % m_pcEncCfg->m_sliceChromaQpOffsetPeriodicity) == 0);
    const uint32_t startCtuTsAddr    = slice->sliceMap.ctuAddrInSlice[0];
    const uint32_t boundingCtuTsAddr = slice->pic->cs->pcv->sizeInCtus;

    if ((iQP = BitAllocation::applyQPAdaptationSlice (slice, m_pcEncCfg, iQP, dLambda, &slice->pic->picVA.visAct, // updates pic->picInitialQP
                                                      *m_ThreadRsrc[0]->m_encCu.getQpPtr(), m_pcRateCtrl->getIntraPQPAStats(),
                                                      (slice->pps->sliceChromaQpFlag && cqp ? sliceChromaQpOffsetIntraOrPeriodic : nullptr),
                                                      m_pcRateCtrl->getMinNoiseLevels(), startCtuTsAddr, boundingCtuTsAddr)) >= 0) // QP OK?
    {
      dLambda *= pow (2.0, ((double) iQP - dQP) / 3.0); // adjust lambda based on change of slice QP
    }
    else iQP = (int) dQP; // revert to unadapted slice QP
  }
  else if (rcp)
  {
    slice->pic->picInitialQP = -1; // no QPA - unused now
  }

  if (slice->pps->sliceChromaQpFlag && CS::isDualITree (*slice->pic->cs) && !m_pcEncCfg->m_usePerceptQPA && (m_pcEncCfg->m_sliceChromaQpOffsetPeriodicity == 0))
  {
    cbQP = m_pcEncCfg->m_chromaCbQpOffsetDualTree + lookAheadRCCQpOffset; // QP offset for dual-tree
    crQP = m_pcEncCfg->m_chromaCrQpOffsetDualTree + lookAheadRCCQpOffset;
    cbCrQP = m_pcEncCfg->m_chromaCbCrQpOffsetDualTree + lookAheadRCCQpOffset;
  }
  else if (slice->pps->sliceChromaQpFlag)
  {
    const GOPEntry &gopEntry             = *(slice->pic->gopEntry);
    const bool bUseIntraOrPeriodicOffset = (slice->isIntra() && !slice->sps->IBC) || (m_pcEncCfg->m_sliceChromaQpOffsetPeriodicity > 0 && (slice->poc % m_pcEncCfg->m_sliceChromaQpOffsetPeriodicity) == 0);

    cbQP = (bUseIntraOrPeriodicOffset ? sliceChromaQpOffsetIntraOrPeriodic[0] : gopEntry.m_CbQPoffset) + lookAheadRCCQpOffset;
    crQP = (bUseIntraOrPeriodicOffset ? sliceChromaQpOffsetIntraOrPeriodic[1] : gopEntry.m_CrQPoffset) + lookAheadRCCQpOffset;
    cbCrQP = (cbQP + crQP) >> 1; // use floor of average CbCr chroma QP offset for joint-CbCr coding

    cbQP = Clip3 (-12, 12, cbQP + slice->pps->chromaQpOffset[COMP_Cb]) - slice->pps->chromaQpOffset[COMP_Cb];
    crQP = Clip3 (-12, 12, crQP + slice->pps->chromaQpOffset[COMP_Cr]) - slice->pps->chromaQpOffset[COMP_Cr];
    cbCrQP = Clip3 (-12, 12, cbCrQP + slice->pps->chromaQpOffset[COMP_JOINT_CbCr]) - slice->pps->chromaQpOffset[COMP_JOINT_CbCr];
  }

  slice->sliceChromaQpDelta[COMP_Cb] = Clip3 (-12, 12, cbQP);
  slice->sliceChromaQpDelta[COMP_Cr] = Clip3 (-12, 12, crQP);
  slice->sliceChromaQpDelta[COMP_JOINT_CbCr] = (slice->sps->jointCbCr ? Clip3 (-12, 12, cbCrQP) : 0);

  for( auto& thrRsc : m_ThreadRsrc )
  {
    thrRsc->m_encCu.setUpLambda( *slice, dLambda, iQP, true, true );
  }

  slice->sliceQp            = iQP;
  slice->chromaQpAdjEnabled = slice->pps->chromaQpOffsetListLen > 0;
}

static const int highTL[6] = { -1, 0, 0, 2, 4, 5 };

int EncSlice::xGetQPForPicture( const Slice* slice )
{
  const int lumaQpBDOffset = slice->sps->qpBDOffset[ CH_L ];
  int qp;

  if ( m_pcEncCfg->m_costMode == VVENC_COST_LOSSLESS_CODING )
  {
    qp = LOSSLESS_AND_MIXED_LOSSLESS_RD_COST_TEST_QP;
  }
  else
  {
    qp = m_pcEncCfg->m_QP + slice->pic->gopAdaptedQP;

    if (m_pcEncCfg->m_usePerceptQPA)
    {
      const int tlayer = slice->pic->gopEntry->m_vtl;

      qp = (slice->isIntra() ? std::min (qp, ((qp - std::min (3, floorLog2 (m_pcEncCfg->m_GOPSize) - 4/*TODO 3 with JVET-AC0149?*/)) * 15 + 3) >> 4) : highTL[tlayer] + ((qp * (16 + std::min (2, tlayer))) >> 4) + 0/*TODO +-1?*/);
    }
    else if( slice->isIntra() )
    {
      qp += m_pcEncCfg->m_intraQPOffset;
    }
    else
    {
      if( qp != -lumaQpBDOffset )
      {
        const GOPEntry &gopEntry = *(slice->pic->gopEntry);
        // adjust QP according to the QP offset for the GOP entry.
        qp += gopEntry.m_QPOffset;

        // adjust QP according to QPOffsetModel for the GOP entry.
        double dqpOffset = qp * gopEntry.m_QPOffsetModelScale + gopEntry.m_QPOffsetModelOffset + 0.5;
        int qpOffset = (int)floor( Clip3<double>( 0.0, 3.0, dqpOffset ) );
        qp += qpOffset;
      }
    }

    if( m_pcEncCfg->m_blockImportanceMapping && !slice->pic->m_picShared->m_ctuBimQpOffset.empty() )
    {
      qp += slice->pic->m_picShared->m_picAuxQpOffset;
    }
  }
  qp = Clip3( -lumaQpBDOffset, MAX_QP, qp );
  return qp;
}


double EncSlice::xCalculateLambda( const Slice* slice,
                                   const int    depth, // slice GOP hierarchical depth.
                                   const double refQP, // initial slice-level QP
                                   const double dQP,   // initial double-precision QP
                                         int&   iQP )  // returned integer QP.
{
  const GOPEntry &gopEntry = *(slice->pic->gopEntry);
  const int SHIFT_QP       = 12;
  const int temporalId     = gopEntry.m_temporalId;
  std::vector<double> intraLambdaModifiers;
  for ( int i = 0; i < VVENC_MAX_TLAYER; i++ )
  {
    if( m_pcEncCfg->m_adIntraLambdaModifier[i] != 0.0 ) intraLambdaModifiers.push_back( m_pcEncCfg->m_adIntraLambdaModifier[i] );
    else break;
  }

  int bitdepth_luma_qp_scale = 6
                               * (slice->sps->bitDepths[ CH_L ] - 8
                                  - DISTORTION_PRECISION_ADJUSTMENT(slice->sps->bitDepths[ CH_L ]));
  double qp_temp = dQP + bitdepth_luma_qp_scale - SHIFT_QP;
  // Case #1: I or P-slices (key-frame)
  double dQPFactor = gopEntry.m_QPFactor;
  if( slice->sliceType == VVENC_I_SLICE )
  {
    if (m_pcEncCfg->m_dIntraQpFactor>=0.0 && gopEntry.m_sliceType != 'I')
    {
      dQPFactor = m_pcEncCfg->m_dIntraQpFactor;
    }
    else
    {
      dQPFactor = 0.57;
      if( ! m_pcEncCfg->m_lambdaFromQPEnable )
      {
        const int NumberBFrames = ( m_pcEncCfg->m_GOPSize - 1 );
        const double dLambda_scale = 1.0 - Clip3( 0.0, 0.5, 0.05 * (double)NumberBFrames );
        dQPFactor *= dLambda_scale;
      }
    }
  }
  else if( m_pcEncCfg->m_lambdaFromQPEnable )
  {
    dQPFactor=0.57;
  }

  double dLambda = dQPFactor*pow( 2.0, qp_temp/3.0 );

  if( !(m_pcEncCfg->m_lambdaFromQPEnable) && depth>0 )
  {
    double qp_temp_ref = refQP + bitdepth_luma_qp_scale - SHIFT_QP;
    dLambda *= Clip3(2.00, 4.00, (qp_temp_ref / 6.0));   // (j == B_SLICE && p_cur_frm->layer != 0 )
  }

  // if hadamard is used in ME process
  if ( !m_pcEncCfg->m_bUseHADME && slice->sliceType != VVENC_I_SLICE )
  {
    dLambda *= 0.95;
  }

  double lambdaModifier;
  if( slice->sliceType != VVENC_I_SLICE || intraLambdaModifiers.empty())
  {
    lambdaModifier = m_pcEncCfg->m_adLambdaModifier[ temporalId ];
  }
  else
  {
    lambdaModifier = intraLambdaModifiers[ (temporalId < intraLambdaModifiers.size()) ? temporalId : (intraLambdaModifiers.size()-1) ];
  }
  dLambda *= lambdaModifier;

  iQP = Clip3( -slice->sps->qpBDOffset[ CH_L ], MAX_QP, (int) floor( dQP + 0.5 ) );

  if( m_pcEncCfg->m_DepQuantEnabled )
  {
    dLambda *= pow( 2.0, 0.25/3.0 ); // slight lambda adjustment for dependent quantization (due to different slope of quantizer)
  }

  // NOTE: the lambda modifiers that are sometimes applied later might be best always applied in here.
  return dLambda;
}


// ====================================================================================================================
// Public member functions
// ====================================================================================================================


/** \param pic   picture class
 */
void EncSlice::compressSlice( Picture* pic )
{
  PROFILER_SCOPE_AND_STAGE( 1, g_timeProfiler, P_COMPRESS_SLICE );
  CodingStructure& cs         = *pic->cs;
  Slice* const slice          = cs.slice;
  uint32_t  startCtuTsAddr    = slice->sliceMap.ctuAddrInSlice[0];
  uint32_t  boundingCtuTsAddr = pic->cs->pcv->sizeInCtus;

  cs.pcv      = slice->pps->pcv;
  cs.fracBits = 0;

  if( startCtuTsAddr == 0 )
  {
    cs.initStructData( slice->sliceQp );
  }

  for( auto* thrRsrc : m_ThreadRsrc )
  {
    thrRsrc->m_encCu.initSlice( slice );
  }

  for( auto* lnRsrc : m_TileLineEncRsrc )
  {
    lnRsrc->m_CABACEstimator    .initCtxModels( *slice );
    lnRsrc->m_SaoCABACEstimator .initCtxModels( *slice );
    lnRsrc->m_AlfCABACEstimator .initCtxModels( *slice );
    lnRsrc->m_AffineProfList    .resetAffineMVList();
    lnRsrc->m_BlkUniMvInfoBuffer.resetUniMvList();
    lnRsrc->m_CachedBvs         .resetIbcBvCand();

    if( slice->sps->saoEnabled && pic->useSAO )
    {
      lnRsrc->m_encSao          .initSlice( slice );
    }
  }

  if( slice->sps->fpelMmvd && !slice->picHeader->disFracMMVD )
  {
    slice->picHeader->disFracMMVD = ( pic->lwidth() * pic->lheight() > 1920 * 1080 ) ? true : false;
  }

  xProcessCtus( pic, startCtuTsAddr, boundingCtuTsAddr );
}

void setJointCbCrModes( CodingStructure& cs, const Position topLeftLuma, const Size sizeLuma )
{
  bool              sgnFlag = true;

  if( isChromaEnabled( cs.picture->chromaFormat) )
  {
    const CompArea  cbArea  = CompArea( COMP_Cb, cs.picture->chromaFormat, Area(topLeftLuma,sizeLuma), true );
    const CompArea  crArea  = CompArea( COMP_Cr, cs.picture->chromaFormat, Area(topLeftLuma,sizeLuma), true );

    const CPelBuf   orgCb   = cs.picture->getFilteredOrigBuffer().valid() ? cs.picture->getRspOrigBuf( cbArea ): cs.picture->getOrigBuf( cbArea );
    const CPelBuf   orgCr   = cs.picture->getFilteredOrigBuffer().valid() ? cs.picture->getRspOrigBuf( crArea ): cs.picture->getOrigBuf( crArea );
    const int       x0      = ( cbArea.x > 0 ? 0 : 1 );
    const int       y0      = ( cbArea.y > 0 ? 0 : 1 );
    const int       x1      = ( cbArea.x + cbArea.width  < cs.picture->Cb().width  ? cbArea.width  : cbArea.width  - 1 );
    const int       y1      = ( cbArea.y + cbArea.height < cs.picture->Cb().height ? cbArea.height : cbArea.height - 1 );
    const int       cbs     = orgCb.stride;
    const int       crs     = orgCr.stride;
    const Pel*      pCb     = orgCb.buf + y0 * cbs;
    const Pel*      pCr     = orgCr.buf + y0 * crs;
    int64_t         sumCbCr = 0;

    // determine inter-chroma transform sign from correlation between high-pass filtered (i.e., zero-mean) Cb and Cr planes
    for( int y = y0; y < y1; y++, pCb += cbs, pCr += crs )
    {
      for( int x = x0; x < x1; x++ )
      {
        int cb = ( 12*(int)pCb[x] - 2*((int)pCb[x-1] + (int)pCb[x+1] + (int)pCb[x-cbs] + (int)pCb[x+cbs]) - ((int)pCb[x-1-cbs] + (int)pCb[x+1-cbs] + (int)pCb[x-1+cbs] + (int)pCb[x+1+cbs]) );
        int cr = ( 12*(int)pCr[x] - 2*((int)pCr[x-1] + (int)pCr[x+1] + (int)pCr[x-crs] + (int)pCr[x+crs]) - ((int)pCr[x-1-crs] + (int)pCr[x+1-crs] + (int)pCr[x-1+crs] + (int)pCr[x+1+crs]) );
        sumCbCr += cb*cr;
      }
    }

    sgnFlag = ( sumCbCr < 0 );
  }

  cs.slice->picHeader->jointCbCrSign = sgnFlag;
}

struct CtuPos
{
  const int ctuPosX;
  const int ctuPosY;
  const int ctuRsAddr;

  CtuPos( int _x, int _y, int _a ) : ctuPosX( _x ), ctuPosY( _y ), ctuRsAddr( _a ) {}
};

class CtuTsIterator
{
  private:
    const CodingStructure& cs;
    const int        m_startTsAddr;
    const int        m_endTsAddr;
    std::vector<int> m_ctuAddrMap;
          int        m_ctuTsAddr;

  private:
    int getNextTsAddr( const int _tsAddr ) const
    {
      const PreCalcValues& pcv  = *cs.pcv;
      const int startSliceRsRow = m_startTsAddr / pcv.widthInCtus;
      const int startSliceRsCol = m_startTsAddr % pcv.widthInCtus;
      const int endSliceRsRow   = (m_endTsAddr - 1) / pcv.widthInCtus;
      const int endSliceRsCol   = (m_endTsAddr - 1) % pcv.widthInCtus;
            int ctuTsAddr = _tsAddr;
      CHECK( ctuTsAddr > m_endTsAddr, "error: array index out of bounds" );
      while( ctuTsAddr < m_endTsAddr )
      {
        ctuTsAddr++;
        const int ctuRsAddr = ctuTsAddr; 
        if( cs.slice->pps->rectSlice
            && ( (ctuRsAddr / pcv.widthInCtus) < startSliceRsRow
              || (ctuRsAddr / pcv.widthInCtus) > endSliceRsRow
              || (ctuRsAddr % pcv.widthInCtus) < startSliceRsCol
              || (ctuRsAddr % pcv.widthInCtus) > endSliceRsCol ) )
          continue;
        break;
      }
      return ctuTsAddr;
    }

    int mapAddr( const int _addr ) const
    {
      if( _addr < 0 )
        return _addr;
      if( _addr >= m_ctuAddrMap.size() )
        return _addr;
      return m_ctuAddrMap[ _addr ];
    }

  public:
    CtuTsIterator( const CodingStructure& _cs, int _s, int _e,       std::vector<int>& _m         ) : cs( _cs ), m_startTsAddr( _s ), m_endTsAddr( _e ), m_ctuAddrMap( _m ), m_ctuTsAddr( _s ) {}
    CtuTsIterator( const CodingStructure& _cs, int _s, int _e, bool _wpp                          ) : cs( _cs ), m_startTsAddr( _s ), m_endTsAddr( _e ),                     m_ctuTsAddr( _s ) { if( _wpp ) setWppPattern(); }
    CtuTsIterator( const CodingStructure& _cs, int _s, int _e, const std::vector<int>& _m         ) : cs( _cs ), m_startTsAddr( _s ), m_endTsAddr( _e ), m_ctuAddrMap( _m ), m_ctuTsAddr( _s ) {}
    CtuTsIterator( const CodingStructure& _cs, int _s, int _e, const std::vector<int>& _m, int _c ) : cs( _cs ), m_startTsAddr( _s ), m_endTsAddr( _e ), m_ctuAddrMap( _m ), m_ctuTsAddr( std::max( _s, _c ) ) {}
    CtuTsIterator( const CodingStructure& _cs, int _s, int _e, const std::vector<int>* _m, bool _wpp ) : cs( _cs ), m_startTsAddr( _s ), m_endTsAddr( _e ), m_ctuTsAddr( _s ) {  if( _wpp ) m_ctuAddrMap = *_m;  }

    virtual ~CtuTsIterator() { m_ctuAddrMap.clear(); }

    CtuTsIterator& operator++()                { m_ctuTsAddr = getNextTsAddr( m_ctuTsAddr ); return *this; }
    CtuTsIterator  operator++(int)             { auto retval = *this; ++(*this); return retval; }
    bool operator==(CtuTsIterator other) const { return m_ctuTsAddr == other.m_ctuTsAddr; }
    bool operator!=(CtuTsIterator other) const { return m_ctuTsAddr != other.m_ctuTsAddr; }
    CtuPos operator*()                   const { const int ctuRsAddr = mapAddr( m_ctuTsAddr );  return CtuPos( ctuRsAddr % cs.pcv->widthInCtus, ctuRsAddr / cs.pcv->widthInCtus, ctuRsAddr ); }

    CtuTsIterator begin() { return CtuTsIterator( cs, m_startTsAddr, m_endTsAddr, m_ctuAddrMap ); };
    CtuTsIterator end()   { return CtuTsIterator( cs, m_startTsAddr, m_endTsAddr, m_ctuAddrMap, m_endTsAddr ); };

    using iterator_category = std::forward_iterator_tag;
    using value_type        = int;
    using pointer           = int*;
    using reference         = int&;
    using difference_type   = ptrdiff_t;

    void setWppPattern()
    {
      const PreCalcValues& pcv = *cs.pcv;
      m_ctuAddrMap.resize( pcv.sizeInCtus, 0 );
      int addr = 0;
      for( int i = 1; i < pcv.sizeInCtus; i++ )
      {
        int x = addr % pcv.widthInCtus;
        int y = addr / pcv.widthInCtus;
        x -= 1;
        y += 1;
        if( x < 0 || y >= pcv.heightInCtus )
        {
          x += 1 + y;
          y  = 0;
        }
        if( x >= pcv.widthInCtus )
        {
          y += ( x - pcv.widthInCtus ) + 1;
          x  = pcv.widthInCtus - 1;
        }
        addr = y * pcv.widthInCtus + x;
        m_ctuAddrMap[ i ] = addr;
      }
    }
};

void EncSlice::saoDisabledRate( CodingStructure& cs, SAOBlkParam* reconParams )
{
  EncSampleAdaptiveOffset::disabledRate( cs, m_saoDisabledRate, reconParams, m_pcEncCfg->m_saoEncodingRate, m_pcEncCfg->m_saoEncodingRateChroma, m_pcEncCfg->m_internChromaFormat );
}

void EncSlice::finishCompressSlice( Picture* pic, Slice& slice )
{
  CodingStructure& cs = *pic->cs;

  // finalize
  if( slice.sps->saoEnabled && pic->useSAO )
  {
    // store disabled statistics
    if( !m_pcEncCfg->m_numThreads )
      saoDisabledRate( cs, &m_saoReconParams[ 0 ] );

    // set slice header flags
    CHECK( m_saoEnabled[ COMP_Cb ] != m_saoEnabled[ COMP_Cr ], "Unspecified error");
    for( auto s : pic->slices )
    {
      s->saoEnabled[ CH_L ] = m_saoEnabled[ COMP_Y  ];
      s->saoEnabled[ CH_C ] = m_saoEnabled[ COMP_Cb ];
    }
  }
}

void EncSlice::xProcessCtus( Picture* pic, const unsigned startCtuTsAddr, const unsigned boundingCtuTsAddr )
{
  PROFILER_SCOPE_TOP_LEVEL_EXT( 1, g_timeProfiler, P_IGNORE, pic->cs );
  CodingStructure& cs      = *pic->cs;
  Slice&           slice   = *cs.slice;
  const PreCalcValues& pcv = *cs.pcv;

  // initialization
  if( slice.sps->jointCbCr )
  {
    setJointCbCrModes( cs, Position(0, 0), cs.area.lumaSize() );
  }

  if( slice.sps->saoEnabled && pic->useSAO )
  {
    // check SAO enabled or disabled
    EncSampleAdaptiveOffset::decidePicParams( cs, m_saoDisabledRate, m_saoEnabled, m_pcEncCfg->m_saoEncodingRate, m_pcEncCfg->m_saoEncodingRateChroma, m_pcEncCfg->m_internChromaFormat );

    m_saoAllDisabled = true;
    for( int compIdx = 0; compIdx < getNumberValidComponents( pcv.chrFormat ); compIdx++ )
    {
      m_saoAllDisabled &= ! m_saoEnabled[ compIdx ];
    }

    std::fill( m_saoReconParams.begin(), m_saoReconParams.end(), SAOBlkParam() );
  }
  else
  {
    m_saoAllDisabled = true;
  }

  if( slice.sps->alfEnabled )
  {
    m_pALF->initEncProcess( slice );
  }

  std::fill( m_processStates.begin(), m_processStates.end(), CTU_ENCODE );

  // fill encoder parameter list
  int idx = 0;
  const std::vector<int> base = slice.sliceMap.ctuAddrInSlice;
  auto ctuIter = CtuTsIterator( cs, startCtuTsAddr, boundingCtuTsAddr, &m_ctuAddrMap, m_pcEncCfg->m_numThreads > 0 );
  for( auto ctuPos : ctuIter )
  {
    ctuEncParams[ idx ].pic       = pic;
    ctuEncParams[ idx ].encSlice  = this;
    ctuEncParams[ idx ].ctuRsAddr = ctuPos.ctuRsAddr;
    ctuEncParams[ idx ].ctuPosX   = ctuPos.ctuPosX;
    ctuEncParams[ idx ].ctuPosY   = ctuPos.ctuPosY;
    ctuEncParams[ idx ].ctuArea   = UnitArea( pic->chromaFormat, slice.pps->pcv->getCtuArea( ctuPos.ctuPosX, ctuPos.ctuPosY ) );

    if( m_pcEncCfg->m_numThreads > 0 )
    {
      ctuEncParams[idx].tileLineResIdx = slice.pps->getTileLineId( ctuPos.ctuPosX, ctuPos.ctuPosY );
    }
    else
    {
      ctuEncParams[idx].tileLineResIdx = 0;
    }
    idx++;
  }

  //for( int i = 0; i < idx; i++ )
  //{
  //  for( int j = i; j < idx; j++ )
  //  {
  //    if( ctuEncParams[i].tileLineResIdx != ctuEncParams[j].tileLineResIdx ) continue;
  //
  //    CHECK( ctuEncParams[i].ctuPosY != ctuEncParams[j].ctuPosY, "Not the same CTU line!" );
  //    CHECK( slice.pps->getTileIdx( ctuEncParams[i].ctuPosX, ctuEncParams[i].ctuPosY ) != slice.pps->getTileIdx( ctuEncParams[j].ctuPosX, ctuEncParams[j].ctuPosY ), "Not the same tile!" );
  //  }
  //}

  CHECK( idx != pcv.sizeInCtus, "array index out of bounds" );

  // process ctu's until last ctu is done
  if( m_pcEncCfg->m_numThreads > 0 )
  {
    for( auto& ctuEncParam : ctuEncParams )
    {
      m_threadPool->addBarrierTask( EncSlice::xProcessCtuTask<false>,
                                    &ctuEncParam,
                                    m_ctuTasksDoneCounter,
                                    nullptr,
                                    {},
                                    EncSlice::xProcessCtuTask<true> );
    }
  }
  else
  {
    do
    {
      for( auto& ctuEncParam : ctuEncParams )
      {
        if( m_processStates[ctuEncParam.ctuRsAddr] != PROCESS_DONE )
          EncSlice::xProcessCtuTask<false>( 0, &ctuEncParam );
      }
      DTRACE_PIC_COMP_COND( m_processStates[ 0 ] == SAO_FILTER && m_processStates[ boundingCtuTsAddr - 1 ] == SAO_FILTER, D_REC_CB_LUMA_LF,   cs, cs.getRecoBuf(), COMP_Y  );
      DTRACE_PIC_COMP_COND( m_processStates[ 0 ] == SAO_FILTER && m_processStates[ boundingCtuTsAddr - 1 ] == SAO_FILTER, D_REC_CB_CHROMA_LF, cs, cs.getRecoBuf(), COMP_Cb );
      DTRACE_PIC_COMP_COND( m_processStates[ 0 ] == SAO_FILTER && m_processStates[ boundingCtuTsAddr - 1 ] == SAO_FILTER, D_REC_CB_CHROMA_LF, cs, cs.getRecoBuf(), COMP_Cr );
      DTRACE_PIC_COMP_COND( m_processStates[ 0 ] == ALF_GET_STATISTICS && m_processStates[ boundingCtuTsAddr - 1 ] == ALF_GET_STATISTICS, D_REC_CB_LUMA_SAO,   cs, cs.getRecoBuf(), COMP_Y  );
      DTRACE_PIC_COMP_COND( m_processStates[ 0 ] == ALF_GET_STATISTICS && m_processStates[ boundingCtuTsAddr - 1 ] == ALF_GET_STATISTICS, D_REC_CB_CHROMA_SAO, cs, cs.getRecoBuf(), COMP_Cb );
      DTRACE_PIC_COMP_COND( m_processStates[ 0 ] == ALF_GET_STATISTICS && m_processStates[ boundingCtuTsAddr - 1 ] == ALF_GET_STATISTICS, D_REC_CB_CHROMA_SAO, cs, cs.getRecoBuf(), COMP_Cr );
    }
    while( m_processStates[ boundingCtuTsAddr - 1 ] != PROCESS_DONE );
  }
}

inline bool checkCtuTaskNbTop( const PPS& pps, const int& ctuPosX, const int& ctuPosY, const int& ctuRsAddr, const ProcessCtuState* processStates, const TaskType tskType, bool override = false )
{
  return ctuPosY > 0 && ( override || pps.canFilterCtuBdry( ctuPosX, ctuPosY, 0, -1 ) ) && processStates[ ctuRsAddr - pps.pcv->widthInCtus ] <= tskType;
}

inline bool checkCtuTaskNbBot( const PPS& pps, const int& ctuPosX, const int& ctuPosY, const int& ctuRsAddr, const ProcessCtuState* processStates, const TaskType tskType, bool override = false )
{
  return ctuPosY + 1 < pps.pcv->heightInCtus && ( override || pps.canFilterCtuBdry( ctuPosX, ctuPosY, 0, 1 ) ) && processStates[ ctuRsAddr     + pps.pcv->widthInCtus ] <= tskType;
}

inline bool checkCtuTaskNbRgt( const PPS& pps, const int& ctuPosX, const int& ctuPosY, const int& ctuRsAddr, const ProcessCtuState* processStates, const TaskType tskType, bool override = false )
{
  return ctuPosX + 1 < pps.pcv->widthInCtus && ( override || pps.canFilterCtuBdry( ctuPosX, ctuPosY, 1, 0 ) ) && processStates[ ctuRsAddr + 1 ] <= tskType;
}

inline bool checkCtuTaskNbTopRgt( const PPS& pps, const int& ctuPosX, const int& ctuPosY, const int& ctuRsAddr, const ProcessCtuState* processStates, const TaskType tskType, bool override = false )
{
  return ctuPosY > 0 && ctuPosX + 1 < pps.pcv->widthInCtus && ( override || pps.canFilterCtuBdry( ctuPosX, ctuPosY, 1, -1 ) ) && processStates[ ctuRsAddr - pps.pcv->widthInCtus + 1 ] <= tskType;
}

inline bool checkCtuTaskNbBotRgt( const PPS& pps, const int& ctuPosX, const int& ctuPosY, const int& ctuRsAddr, const ProcessCtuState* processStates, const TaskType tskType, const int rightOffset = 1, bool override = false )
{
  return ctuPosX + rightOffset < pps.pcv->widthInCtus && ctuPosY + 1 < pps.pcv->heightInCtus && ( override || pps.canFilterCtuBdry( ctuPosX, ctuPosY, rightOffset, 1 ) ) && processStates[ ctuRsAddr + rightOffset + pps.pcv->widthInCtus ] <= tskType;
}

template<bool checkReadyState>
bool EncSlice::xProcessCtuTask( int threadIdx, void* taskParam )
{
  CtuEncParam* ctuEncParam       = static_cast<CtuEncParam*>( taskParam );
  Picture* pic                   = ctuEncParam->pic;
  EncSlice* encSlice             = ctuEncParam->encSlice;
  CodingStructure& cs            = *pic->cs;
  Slice&           slice         = *cs.slice;
  const PPS&       pps           = *slice.pps;
  const PreCalcValues& pcv       = *cs.pcv;
  const int ctuRsAddr            = ctuEncParam->ctuRsAddr;
  const int ctuPosX              = ctuEncParam->ctuPosX;
  const int ctuPosY              = ctuEncParam->ctuPosY;
  const int x                    = ctuPosX << pcv.maxCUSizeLog2;
  const int y                    = ctuPosY << pcv.maxCUSizeLog2;
  const int width                = std::min( pcv.maxCUSize, pcv.lumaWidth  - x );
  const int height               = std::min( pcv.maxCUSize, pcv.lumaHeight - y );
  const int ctuStride            = pcv.widthInCtus;
  const int lineIdx              = ctuEncParam->tileLineResIdx;
  ProcessCtuState* processStates = encSlice->m_processStates.data();
  const UnitArea& ctuArea        = ctuEncParam->ctuArea;
  const bool wppSyncEnabled      = cs.sps->entropyCodingSyncEnabled;
  const TaskType currState       = processStates[ ctuRsAddr ];
  const unsigned syncLines       = encSlice->m_pcEncCfg->m_ifpLines;

  DTRACE_UPDATE( g_trace_ctx, std::make_pair( "poc", cs.slice->poc ) );
  DTRACE_UPDATE( g_trace_ctx, std::make_pair( "ctu", ctuRsAddr ) );
  DTRACE_UPDATE( g_trace_ctx, std::make_pair( "final", processStates[ ctuRsAddr ] == CTU_ENCODE ? 0 : 1 ) );

  // process ctu's line wise from left to right
  const bool tileParallel = encSlice->m_pcEncCfg->m_tileParallelCtuEnc;
  if( tileParallel && currState == CTU_ENCODE && ctuPosX > 0 && slice.pps->getTileIdx( ctuPosX, ctuPosY ) != slice.pps->getTileIdx( ctuPosX - 1, ctuPosY ) )
    ; // for CTU_ENCODE on tile boundaries, allow parallel processing of tiles
  else if( ctuPosX > 0 && processStates[ ctuRsAddr - 1 ] <= currState && currState < PROCESS_DONE )
    return false;

  switch( currState )
  {
    // encode
    case CTU_ENCODE:
      {
        // CTU line-wise inter-frame parallel processing synchronization
        if( syncLines )
        {
          const bool lineStart = ctuPosX == 0 || ( tileParallel && slice.pps->getTileIdx( ctuPosX, ctuPosY ) != slice.pps->getTileIdx( ctuPosX - 1, ctuPosY ) );
          if( lineStart && !refPicCtuLineReady( slice, ctuPosY + (int)syncLines, pcv ) )
          {
            return false;
          }
        }

        // general wpp conditions, top and top-right ctu have to be encoded
        if( encSlice->m_pcEncCfg->m_tileParallelCtuEnc && ctuPosY > 0 && slice.pps->getTileIdx( ctuPosX, ctuPosY ) != slice.pps->getTileIdx( ctuPosX, ctuPosY - 1 ) )
          ; // allow parallel processing of CTU-encoding on independent tiles
        else if( ctuPosY > 0                                  && processStates[ ctuRsAddr - ctuStride     ] <= CTU_ENCODE )
          return false;
        else if( ctuPosY > 0 && ctuPosX + 1 < pcv.widthInCtus && processStates[ ctuRsAddr - ctuStride + 1 ] <= CTU_ENCODE && !wppSyncEnabled )
          return false;
        
        if( checkReadyState )
          return true;

#ifdef TRACE_ENABLE_ITT
        std::stringstream ss;
        ss << "Encode_" << slice.poc << "_CTU_" << ctuPosY << "_" << ctuPosX;
        __itt_string_handle* itt_handle_ctuEncode = __itt_string_handle_create( ss.str().c_str() );
#endif
        ITT_TASKSTART( itt_domain_encode, itt_handle_ctuEncode );

        TileLineEncRsrc* lineEncRsrc = encSlice->m_TileLineEncRsrc[ lineIdx ];
        PerThreadRsrc* taskRsrc      = encSlice->m_ThreadRsrc[ threadIdx ];
        EncCu& encCu                 = taskRsrc->m_encCu;

        encCu.setCtuEncRsrc( &lineEncRsrc->m_CABACEstimator, &taskRsrc->m_CtxCache, &lineEncRsrc->m_ReuseUniMv, &lineEncRsrc->m_BlkUniMvInfoBuffer, &lineEncRsrc->m_AffineProfList, &lineEncRsrc->m_CachedBvs );
        encCu.encodeCtu( pic, lineEncRsrc->m_prevQp, ctuPosX, ctuPosY );

        // cleanup line memory when last ctu in line done to reduce overall memory consumption
        if( encSlice->m_pcEncCfg->m_ensureWppBitEqual && ( ctuPosX == pcv.widthInCtus - 1 || slice.pps->getTileIdx( ctuPosX, ctuPosY ) != slice.pps->getTileIdx( ctuPosX + 1, ctuPosY ) ) )
        {
          lineEncRsrc->m_AffineProfList    .resetAffineMVList();
          lineEncRsrc->m_BlkUniMvInfoBuffer.resetUniMvList();
          lineEncRsrc->m_ReuseUniMv        .resetReusedUniMvs();
          lineEncRsrc->m_CachedBvs         .resetIbcBvCand();
        }

        DTRACE_UPDATE( g_trace_ctx, std::make_pair( "final", 1 ) );
        ITT_TASKEND( itt_domain_encode, itt_handle_ctuEncode );

        processStates[ ctuRsAddr ] = RESHAPE_LF_VER;
      }
      break;

    // reshape + vertical loopfilter
    case RESHAPE_LF_VER:
      {
        // clip check to right tile border (CTU_ENCODE pre-processing delay due to IBC)
        const int tileCol = slice.pps->ctuToTileCol[ctuPosX];
        const int lastCtuPosXInTile = slice.pps->tileColBd[tileCol] + slice.pps->tileColWidth[tileCol] - 1;
        const int checkRight = std::min<int>( encSlice->m_ctuEncDelay, lastCtuPosXInTile - ctuPosX );

        const bool hasTiles = encSlice->m_pcEncCfg->m_tileParallelCtuEnc && slice.pps->getNumTiles() > 1;

        // need to check line above bcs of tiling, which allows CTU_ENCODE to run independently across tiles
        if( hasTiles )
        {
          if( ctuPosY > 0 )
          {
            for( int i = -!!ctuPosX; i <= checkRight; i++ )
              if( pps.canFilterCtuBdry( ctuPosX, ctuPosY, i, -1 ) && processStates[ctuRsAddr - ctuStride + i] <= CTU_ENCODE )
                return false;
          }
        }
        
        // ensure all surrounding ctu's are encoded (intra pred requires non-reshaped and unfiltered residual, IBC requires unfiltered samples too)
        // check right with max offset (due to WPP condition above, this implies top-right has been already encoded)
        for( int i = hasTiles ? -!!ctuPosX : checkRight; i <= checkRight; i++ )
          if( pps.canFilterCtuBdry( ctuPosX, ctuPosY, i, 0 ) && processStates[ctuRsAddr + i] <= CTU_ENCODE )
            return false;

        // check bottom right with 1 CTU delay (this is only required for intra pred)
        // at the right picture border this will check the bottom CTU
        const int checkBottomRight = std::min<int>( 1, lastCtuPosXInTile - ctuPosX );
        if( checkCtuTaskNbBotRgt( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, CTU_ENCODE, checkBottomRight ) ) 
          return false;

        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_rspLfVer );

        // reshape
        if( slice.sps->lumaReshapeEnable && slice.picHeader->lmcsEnabled )
        {
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_RESHAPER, &cs, CH_L );
          PelBuf reco = pic->getRecoBuf( COMP_Y ).subBuf( x, y, width, height );
          reco.rspSignal( pic->reshapeData.getInvLUT() );
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_IGNORE, &cs, CH_L );
        }

        // loopfilter
        if( !cs.pps->deblockingFilterControlPresent || !cs.pps->deblockingFilterDisabled || cs.pps->deblockingFilterOverrideEnabled )
        {
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_DEBLOCK_FILTER, &cs, CH_L );
          // calculate filter strengths
          encSlice->m_pLoopFilter->calcFilterStrengthsCTU( cs, ctuArea, true );

          // vertical filter
          PelUnitBuf reco = cs.picture->getRecoBuf();
          encSlice->m_pLoopFilter->xDeblockArea<EDGE_VER>( cs, ctuArea, MAX_NUM_CH, reco );
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_IGNORE, &cs, CH_L );
        }

        ITT_TASKEND( itt_domain_encode, itt_handle_rspLfVer );

        processStates[ ctuRsAddr ] = LF_HOR;
      }
      break;

    // horizontal loopfilter
    case LF_HOR:
      {
        // ensure horizontal ordering (from top to bottom)
        if( checkCtuTaskNbTop   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, LF_HOR ) )         
          return false;

        // ensure vertical loop filter of neighbor ctu's will not modify current residual
        // check top, top-right and right ctu
        // (top, top-right checked implicitly due to ordering check above)
        if( checkCtuTaskNbRgt   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, RESHAPE_LF_VER ) ) 
          return false;

        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_lfHor );

        if( !cs.pps->deblockingFilterControlPresent || !cs.pps->deblockingFilterDisabled || cs.pps->deblockingFilterOverrideEnabled )
        {
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_DEBLOCK_FILTER, &cs, CH_L );
          PelUnitBuf reco = cs.picture->getRecoBuf();
          encSlice->m_pLoopFilter->xDeblockArea<EDGE_HOR>( cs, ctuArea, MAX_NUM_CH, reco );
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_IGNORE, &cs, CH_L );
        }

        ITT_TASKEND( itt_domain_encode, itt_handle_lfHor );

        processStates[ ctuRsAddr ] = SAO_FILTER;
      }
      break;

    // SAO filter
    case SAO_FILTER:
      {
        // general wpp conditions, top and top-right ctu have to be filtered
        if( checkCtuTaskNbTop   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, SAO_FILTER, true ) ) return false;
        if( checkCtuTaskNbTopRgt( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, SAO_FILTER, true ) ) return false;

        // ensure loop filter of neighbor ctu's will not modify current residual
        // sao processing dependents on +1 pixel to each side
        // due to wpp condition above, only right, bottom and bottom-right ctu have to be checked
        if( checkCtuTaskNbRgt   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, LF_HOR,    true ) ) return false;
        if( checkCtuTaskNbBot   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, LF_HOR,    true ) ) return false;
        if( checkCtuTaskNbBotRgt( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, LF_HOR, 1, true ) ) return false;

        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_sao );

        // SAO filter
        if( slice.sps->saoEnabled && pic->useSAO )
        {
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_SAO, &cs, CH_L );
          TileLineEncRsrc* lineEncRsrc    = encSlice->m_TileLineEncRsrc[ lineIdx ];
          PerThreadRsrc* taskRsrc         = encSlice->m_ThreadRsrc[ threadIdx ];
          EncSampleAdaptiveOffset& encSao = lineEncRsrc->m_encSao;

          encSao.setCtuEncRsrc( &lineEncRsrc->m_SaoCABACEstimator, &taskRsrc->m_CtxCache );
          encSao.storeCtuReco( cs, ctuArea, ctuPosX, ctuPosY );
          encSao.getCtuStatistics( cs, encSlice->m_saoStatData, ctuArea, ctuRsAddr );
          encSao.decideCtuParams( cs, encSlice->m_saoStatData, encSlice->m_saoEnabled, encSlice->m_saoAllDisabled, ctuArea, ctuRsAddr, &encSlice->m_saoReconParams[ 0 ], cs.picture->getSAO() );
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_IGNORE, &cs, CH_L );
        }

        // ALF border extension
        if( cs.sps->alfEnabled )
        {
          // we have to do some kind of position aware boundary padding
          // it's done here because the conditions are readable
          PelUnitBuf recoBuf = cs.picture->getRecoBuf();
          const int fltSize  = ( MAX_ALF_FILTER_LENGTH + 1 ) >> 1;
          const int xL       = ( ctuPosX == 0 )                 ? ( x-fltSize       ) : ( x );
          const int xR       = ( ctuPosX+1 == pcv.widthInCtus ) ? ( x+width+fltSize ) : ( x+width );

          if( ctuPosX == 0 )                  recoBuf.extendBorderPelLft( y, height, fltSize );
          if( ctuPosX+1 == pcv.widthInCtus )  recoBuf.extendBorderPelRgt( y, height, fltSize );
          if( ctuPosY == 0 )                  recoBuf.extendBorderPelTop( xL, xR-xL, fltSize );
          if( ctuPosY+1 == pcv.heightInCtus ) recoBuf.extendBorderPelBot( xL, xR-xL, fltSize );

          encSlice->m_pALF->copyCTUforALF(cs, ctuPosX, ctuPosY);
        }

        // DMVR refinement can be stored now
        if( slice.sps->DMVR && !slice.picHeader->disDmvrFlag )
        {
          CS::setRefinedMotionFieldCTU( cs, ctuPosX, ctuPosY );
        }
        ITT_TASKEND( itt_domain_encode, itt_handle_sao );

        const int tileCol = slice.pps->ctuToTileCol[ctuPosX];
        const int lastCtuColInTileRow = slice.pps->tileColBd[tileCol] + slice.pps->tileColWidth[tileCol] - 1;
        if( ctuPosX == lastCtuColInTileRow )
        {
          processStates[ctuRsAddr] = ALF_GET_STATISTICS;
        }
        else
        {
          processStates[ctuRsAddr] = PROCESS_DONE;
          return true;
        }
      }
      break;

    case ALF_GET_STATISTICS:
      {
        // ensure all surrounding ctu's are filtered (ALF will use pixels of adjacent CTU's)
        // due to wpp condition above in SAO_FILTER, only right, bottom and bottom-right ctu have to be checked
        if( checkCtuTaskNbRgt   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, SAO_FILTER ) ) return false;
        if( checkCtuTaskNbBot   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, SAO_FILTER ) ) return false;
        if( checkCtuTaskNbBotRgt( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, SAO_FILTER ) ) return false;

        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_alf_stat );

        // ALF pre-processing
        if( slice.sps->alfEnabled )
        {
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_ALF, &cs, CH_L );
          PelUnitBuf recoBuf = cs.picture->getRecoBuf();
          const int firstCtuInRow = ctuRsAddr + 1 - slice.pps->tileColWidth[slice.pps->ctuToTileCol[ctuPosX]];
          for( int ctu = firstCtuInRow; ctu <= ctuRsAddr; ctu++ )
          {
            encSlice->m_pALF->getStatisticsCTU( *cs.picture, cs, recoBuf, ctu, encSlice->m_ThreadRsrc[ threadIdx ]->m_alfTempCtuBuf );
          }
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_IGNORE, &cs, CH_L );
        }

        ITT_TASKEND( itt_domain_encode, itt_handle_alf_stat );

        // start alf filter derivation either for a sub-set of CTUs (syncLines mode) or for the whole picture (regular mode)
        const unsigned deriveFilterCtu = encSlice->m_alfDeriveCtu;
        processStates[ctuRsAddr] = (ctuRsAddr < deriveFilterCtu) ? ALF_RECONSTRUCT: ALF_DERIVE_FILTER;
      }
      break;

    case ALF_DERIVE_FILTER:
      {
        const unsigned deriveFilterCtu = encSlice->m_alfDeriveCtu;
        if( ctuRsAddr == deriveFilterCtu )
        {
          // ensure statistics from all previous ctu's have been collected
          int numCheckLines = deriveFilterCtu / pcv.widthInCtus + 1;
          for( int y = 0; y < numCheckLines; y++ )
          {
            for( int tileCol = 0; tileCol < slice.pps->numTileCols; tileCol++ )
            {
              const int lastCtuInTileRow = y * pcv.widthInCtus + slice.pps->tileColBd[tileCol] + slice.pps->tileColWidth[tileCol] - 1;
              if( processStates[lastCtuInTileRow] <= ALF_GET_STATISTICS )
                return false;
            }
          }
        }
        else if( syncLines )
        {
          // ALF bitstream coding dependency for the sub-sequent ctu-lines
          if( processStates[deriveFilterCtu] < ALF_RECONSTRUCT || checkCtuTaskNbTop( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, ALF_DERIVE_FILTER ) ) 
            return false;
        }
        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_alf_derive );
        // ALF post-processing
        if( slice.sps->alfEnabled )
        {
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_ALF, &cs, CH_L );
          if( ctuRsAddr == deriveFilterCtu )
          {
            encSlice->m_pALF->initDerivation( slice );
            encSlice->m_pALF->deriveFilter( *cs.picture, cs, slice.getLambdas(), deriveFilterCtu + 1 );
            encSlice->m_pALF->reconstructCoeffAPSs( cs, cs.slice->alfEnabled[COMP_Y], cs.slice->alfEnabled[COMP_Cb] || cs.slice->alfEnabled[COMP_Cr], false );
          }
          else if( syncLines )
          {
            // in sync lines mode: derive/select filter for the remaining lines
            TileLineEncRsrc* lineEncRsrc = encSlice->m_TileLineEncRsrc[ lineIdx ];
            PerThreadRsrc*   taskRsrc    = encSlice->m_ThreadRsrc[ threadIdx ];
            const int firstCtuInRow = ctuRsAddr + 1 - slice.pps->tileColWidth[slice.pps->ctuToTileCol[ctuPosX]];
            for(int ctu = firstCtuInRow; ctu <= ctuRsAddr; ctu++)
            {
              encSlice->m_pALF->selectFilterForCTU( cs, &lineEncRsrc->m_AlfCABACEstimator, &taskRsrc->m_CtxCache, ctu );
            }
          }
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_IGNORE, &cs, CH_L );
        }

        ITT_TASKEND( itt_domain_encode, itt_handle_alf_derive );
        processStates[ ctuRsAddr ] = ALF_RECONSTRUCT;
      }
      break;

    case ALF_RECONSTRUCT:
      {
        // start alf filter derivation either for a sub-set of CTUs (syncLines mode) or for the whole picture (regular mode)
        const unsigned deriveFilterCtu = encSlice->m_alfDeriveCtu;
        if( processStates[deriveFilterCtu] < ALF_RECONSTRUCT )
          return false;
        else if( syncLines && ctuRsAddr > deriveFilterCtu && encSlice->m_pALF->getAsuHeightInCtus() > 1 )
        {
          const int asuHeightInCtus = encSlice->m_pALF->getAsuHeightInCtus();
          const int botCtuLineInAsu = std::min( (( ctuPosY & ( ~(asuHeightInCtus - 1) ) ) + asuHeightInCtus - 1), (int)pcv.heightInCtus - 1 );
          if( processStates[botCtuLineInAsu * ctuStride + ctuPosX] < ALF_RECONSTRUCT ) 
            return false;
        }

        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_alf_recon );

        if( slice.sps->alfEnabled )
        {
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_ALF, &cs, CH_L );
          const int firstCtuInRow = ctuRsAddr + 1 - slice.pps->tileColWidth[slice.pps->ctuToTileCol[ctuPosX]];
          for( int ctu = firstCtuInRow; ctu <= ctuRsAddr; ctu++ )
          {
            encSlice->m_pALF->reconstructCTU_MT( *cs.picture, cs, ctu, encSlice->m_ThreadRsrc[ threadIdx ]->m_alfTempCtuBuf );
          }
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_IGNORE, &cs, CH_L );
        }

        ITT_TASKEND( itt_domain_encode, itt_handle_alf_recon );
        processStates[ctuRsAddr] = CCALF_GET_STATISTICS;
      }
      // dont break, no additional deps, can continue straigt away!
      //break;

    case CCALF_GET_STATISTICS:
      {
        if( checkCtuTaskNbTop   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, ALF_RECONSTRUCT ) ) return false;
        if( checkCtuTaskNbBot   ( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, ALF_RECONSTRUCT ) ) return false;

        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_ccalf_stat );

        // ALF pre-processing
        if( slice.sps->ccalfEnabled )
        {
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_ALF, &cs, CH_L);
          const int firstCtuInRow = ctuRsAddr + 1 - slice.pps->tileColWidth[slice.pps->ctuToTileCol[ctuPosX]];
          for( int ctu = firstCtuInRow; ctu <= ctuRsAddr; ctu++ )
          {
            encSlice->m_pALF->deriveStatsForCcAlfFilteringCTU( cs, COMP_Cb, ctu, encSlice->m_ThreadRsrc[ threadIdx ]->m_alfTempCtuBuf );
            encSlice->m_pALF->deriveStatsForCcAlfFilteringCTU( cs, COMP_Cr, ctu, encSlice->m_ThreadRsrc[ threadIdx ]->m_alfTempCtuBuf );
          }
          PROFILER_EXT_ACCUM_AND_START_NEW_SET( 1, _TPROF, P_IGNORE, &cs, CH_L );
        }

        ITT_TASKEND( itt_domain_encode, itt_handle_ccalf_stat );

        // start alf filter derivation either for a sub-set of CTUs (syncLines mode) or for the whole picture (regular mode)
        processStates[ctuRsAddr] = (ctuRsAddr < encSlice->m_ccalfDeriveCtu) ? CCALF_RECONSTRUCT: CCALF_DERIVE_FILTER;
      }
      break;

    case CCALF_DERIVE_FILTER:
      {
        // synchronization dependencies
        const unsigned deriveFilterCtu = encSlice->m_ccalfDeriveCtu;
        if( ctuRsAddr == deriveFilterCtu )
        {
          // ensure statistics from all previous ctu's have been collected
          int numCheckLines = deriveFilterCtu / pcv.widthInCtus + 1;
          for( int y = 0; y < numCheckLines; y++ )
          {
            for( int tileCol = 0; tileCol < slice.pps->numTileCols; tileCol++ )
            {
              const int lastCtuInTileRow = y * pcv.widthInCtus + slice.pps->tileColBd[tileCol] + slice.pps->tileColWidth[tileCol] - 1;
              if( processStates[lastCtuInTileRow] <= CCALF_GET_STATISTICS )
                return false;
            }
          }
        }
        else if( syncLines )
        {
          // ALF bitstream coding dependency for the sub-sequent CTU-lines
          if( processStates[deriveFilterCtu] < CCALF_RECONSTRUCT || checkCtuTaskNbTop( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, CCALF_DERIVE_FILTER ) ) 
            return false;
        }
        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_ccalf_derive );

        // start task
        if( slice.sps->ccalfEnabled )
        {
          if( ctuRsAddr == deriveFilterCtu )
          {
            encSlice->m_pALF->deriveCcAlfFilter( *cs.picture, cs, encSlice->m_ccalfDeriveCtu + 1 );
          }
          else if( syncLines )
          {
            // in sync lines mode: derive/select filter for the remaining lines
            TileLineEncRsrc* lineEncRsrc = encSlice->m_TileLineEncRsrc[ lineIdx ];
            PerThreadRsrc*   taskRsrc    = encSlice->m_ThreadRsrc[ threadIdx ];
            const int firstCtuInRow = ctuRsAddr + 1 - slice.pps->tileColWidth[slice.pps->ctuToTileCol[ctuPosX]];
            encSlice->m_pALF->selectCcAlfFilterForCtuLine( cs, COMP_Cb, cs.getRecoBuf(), &lineEncRsrc->m_AlfCABACEstimator, &taskRsrc->m_CtxCache, firstCtuInRow, ctuRsAddr );
            encSlice->m_pALF->selectCcAlfFilterForCtuLine( cs, COMP_Cr, cs.getRecoBuf(), &lineEncRsrc->m_AlfCABACEstimator, &taskRsrc->m_CtxCache, firstCtuInRow, ctuRsAddr );
          }
        }
        ITT_TASKEND( itt_domain_encode, itt_handle_ccalf_derive );

        processStates[ctuRsAddr] = CCALF_RECONSTRUCT;
      }
      break;

    case CCALF_RECONSTRUCT:
      {
        // start ccalf filter derivation either for a sub-set of CTUs (syncLines mode) or for the whole picture (regular mode)
        const unsigned deriveFilterCtu = encSlice->m_ccalfDeriveCtu;
        if( processStates[deriveFilterCtu] < CCALF_RECONSTRUCT )
          return false;

        if( syncLines )
        {
          // ensure line-by-line reconstruction due to line synchronization
          if( checkCtuTaskNbTop( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, CCALF_RECONSTRUCT ) ) return false;
          // check bottom due to rec. buffer usage in ccalf statistics
          if( checkCtuTaskNbBot( pps, ctuPosX, ctuPosY, ctuRsAddr, processStates, CCALF_GET_STATISTICS ) ) return false;
        }

        if( checkReadyState )
          return true;

        ITT_TASKSTART( itt_domain_encode, itt_handle_ccalf_recon );

        if( slice.sps->ccalfEnabled )
        {
          const int firstCtuInRow = ctuRsAddr + 1 - slice.pps->tileColWidth[slice.pps->ctuToTileCol[ctuPosX]];
          for( int ctu = firstCtuInRow; ctu <= ctuRsAddr; ctu++ )
          {
            encSlice->m_pALF->applyCcAlfFilterCTU( cs, COMP_Cb, ctu, encSlice->m_ThreadRsrc[ threadIdx ]->m_alfTempCtuBuf );
            encSlice->m_pALF->applyCcAlfFilterCTU( cs, COMP_Cr, ctu, encSlice->m_ThreadRsrc[ threadIdx ]->m_alfTempCtuBuf );
          }
        }

        ITT_TASKEND( itt_domain_encode, itt_handle_ccalf_recon );

        // extend pic border
        // CCALF reconstruction stage is done per tile, ensure that all tiles in current CTU row are done  
        if( ++(pic->m_tileColsDone->at(ctuPosY)) >= pps.numTileCols )
        {
          PelUnitBuf recoBuf = cs.picture->getRecoBuf();
          const int margin = cs.picture->margin;
          recoBuf.extendBorderPelLft( y, height, margin );
          recoBuf.extendBorderPelRgt( y, height, margin );
          if(ctuPosY == 0)
            recoBuf.extendBorderPelTop( -margin, pcv.lumaWidth + 2 * margin, margin );
          if(ctuPosY + 1 == pcv.heightInCtus)
            recoBuf.extendBorderPelBot( -margin, pcv.lumaWidth + 2 * margin, margin );

          // for IFP lines synchro, do an additional increment signaling that CTU row is ready
          if( syncLines )
            ++(pic->m_tileColsDone->at( ctuPosY ));
        }

        // perform finish only once for whole picture
        const unsigned finishCtu = pcv.sizeInCtus - 1;
        if( ctuRsAddr < finishCtu )
        {
          processStates[ctuRsAddr] = PROCESS_DONE;
          // processing done => terminate thread
          return true;
        }
        processStates[ctuRsAddr] = FINISH_SLICE;
      }

    case FINISH_SLICE:
      {
        CHECK( ctuRsAddr != pcv.sizeInCtus - 1, "invalid state, finish slice only once for last ctu" );

        // ensure all coding tasks have been done for all previous ctu's
        for( int i = 0; i < ctuRsAddr; i++ )
          if( processStates[ i ] < FINISH_SLICE )
            return false;

        if( checkReadyState )
          return true;

        encSlice->finishCompressSlice( cs.picture, slice );

        processStates[ ctuRsAddr ] = PROCESS_DONE;
        // processing done => terminate thread
        return true;
      }

    case PROCESS_DONE:
      CHECK( true, "process state is PROCESS_DONE, but thread is still running" );
      return true;

    default:
      CHECK( true, "unknown process state" );
      return true;
  }

  return false;
}

void EncSlice::encodeSliceData( Picture* pic )
{
  CodingStructure& cs              = *pic->cs;
  Slice* const slice               = cs.slice;
  const uint32_t startCtuTsAddr    = slice->sliceMap.ctuAddrInSlice[0];
  const uint32_t boundingCtuTsAddr = cs.pcv->sizeInCtus;
  const bool wavefrontsEnabled     = slice->sps->entropyCodingSyncEnabled;

  // this ensures that independently encoded bitstream chunks can be combined to bit-equal
  const SliceType cabacTableIdx = ! slice->pps->cabacInitPresent || slice->pendingRasInit ? slice->sliceType : m_encCABACTableIdx;
  slice->encCABACTableIdx = cabacTableIdx;

  // initialise entropy coder for the slice
  m_CABACWriter.initCtxModels( *slice );

  DTRACE( g_trace_ctx, D_HEADER, "=========== POC: %d ===========\n", slice->poc );

  int prevQP[MAX_NUM_CH];
  prevQP[0] = prevQP[1] = slice->sliceQp;

  const PreCalcValues& pcv        = *cs.pcv;
  const uint32_t widthInCtus      = pcv.widthInCtus;
  uint32_t uiSubStrm              = 0;
  const int numSubstreamsColumns  = slice->pps->numTileCols;
  const int numSubstreamRows      = slice->sps->entropyCodingSyncEnabled ? pic->cs->pcv->heightInCtus : slice->pps->numTileRows;
  const int numSubstreams         = std::max<int>( numSubstreamRows * numSubstreamsColumns, 0/*(int)pic->brickMap->bricks.size()*/ );
  std::vector<OutputBitstream> substreamsOut( numSubstreams );

  slice->clearSubstreamSizes();

  for( uint32_t ctuTsAddr = startCtuTsAddr; ctuTsAddr < boundingCtuTsAddr; ctuTsAddr++ )
  {
    const uint32_t ctuRsAddr            = slice->sliceMap.ctuAddrInSlice[ctuTsAddr];
    const uint32_t ctuXPosInCtus        = ctuRsAddr % widthInCtus;
    const uint32_t ctuYPosInCtus        = ctuRsAddr / widthInCtus;
    const uint32_t tileXPosInCtus       = slice->pps->tileColBd[cs.pps->ctuToTileCol[ctuXPosInCtus]];
    const uint32_t tileYPosInCtus       = slice->pps->tileRowBd[cs.pps->ctuToTileRow[ctuYPosInCtus]];

    DTRACE_UPDATE( g_trace_ctx, std::make_pair( "ctu", ctuRsAddr ) );

    const Position pos (ctuXPosInCtus * pcv.maxCUSize, ctuYPosInCtus * pcv.maxCUSize);
    const UnitArea ctuArea (cs.area.chromaFormat, Area(pos.x, pos.y, pcv.maxCUSize, pcv.maxCUSize));
    CHECK( uiSubStrm >= numSubstreams, "array index out of bounds" );
    m_CABACWriter.initBitstream( &substreamsOut[ uiSubStrm ] );

    // set up CABAC contexts' state for this CTU
    if (ctuXPosInCtus == tileXPosInCtus && ctuYPosInCtus == tileYPosInCtus )
    {
      if (ctuTsAddr != startCtuTsAddr) // if it is the first CTU, then the entropy coder has already been reset
      {
        m_CABACWriter.initCtxModels( *slice );
      }
      prevQP[0] = prevQP[1] = slice->sliceQp;
    }
    else if (ctuXPosInCtus == tileXPosInCtus && wavefrontsEnabled)
    {
      // Synchronize cabac probabilities with upper-right CTU if it's available and at the start of a line.
      if (ctuTsAddr != startCtuTsAddr) // if it is the first CTU, then the entropy coder has already been reset
      {
        m_CABACWriter.initCtxModels( *slice );
      }
      if( cs.getCURestricted( pos.offset( 0, -1 ), pos, slice->independentSliceIdx, slice->pps->getTileIdx( ctuXPosInCtus, ctuYPosInCtus ), CH_L, TREE_D ) )
      {
        // Top-right is available, so use it.
        m_CABACWriter.getCtx() = m_entropyCodingSyncContextState;
      }
      prevQP[0] = prevQP[1] = slice->sliceQp;
    }

    m_CABACWriter.coding_tree_unit( cs, ctuArea, prevQP, ctuRsAddr );

    // store probabilities of second CTU in line into buffer
    if( ctuXPosInCtus == tileXPosInCtus && wavefrontsEnabled )
    {
      m_entropyCodingSyncContextState = m_CABACWriter.getCtx();
    }

    // terminate the sub-stream, if required (end of slice-segment, end of tile, end of wavefront-CTU-row):
    bool isMoreCTUsinSlice = ctuTsAddr != (boundingCtuTsAddr - 1);
    bool isLastCTUinTile   = isMoreCTUsinSlice && slice->pps->getTileIdx( ctuRsAddr ) != slice->pps->getTileIdx( slice->sliceMap.ctuAddrInSlice[ctuTsAddr+1] );
    bool isLastCTUinWPP    = wavefrontsEnabled && isMoreCTUsinSlice && !isLastCTUinTile && ( (slice->sliceMap.ctuAddrInSlice[ctuTsAddr+1] % widthInCtus) == cs.pps->tileColBd[cs.pps->ctuToTileCol[slice->sliceMap.ctuAddrInSlice[ctuTsAddr+1] % widthInCtus]] ); //TODO: adjust tile bound condition

    if (isLastCTUinWPP || !isMoreCTUsinSlice || isLastCTUinTile )         // this the the last CTU of either tile/brick/WPP/slice
    {
      m_CABACWriter.end_of_slice();

      // Byte-alignment in slice_data() when new tile
      substreamsOut[ uiSubStrm ].writeByteAlignment();

      if (isMoreCTUsinSlice) //Byte alignment only when it is not the last substream in the slice
      {
        // write sub-stream size
        slice->addSubstreamSize( ( substreamsOut[ uiSubStrm ].getNumberOfWrittenBits() >> 3 ) + substreamsOut[ uiSubStrm ].countStartCodeEmulations() );
      }
      uiSubStrm++;
    }
  } // CTU-loop

  if(slice->pps->cabacInitPresent)
  {
    m_encCABACTableIdx = m_CABACWriter.getCtxInitId( *slice );
  }
  else
  {
    m_encCABACTableIdx = slice->sliceType;
  }

  // concatenate substreams
  OutputBitstream& outStream = pic->sliceDataStreams[ 0/*slice->sliceIdx*/ ];
  for ( int i = 0; i < slice->getNumberOfSubstreamSizes() + 1; i++ )
  {
    outStream.addSubstream( &(substreamsOut[ i ]) );
  }
  pic->sliceDataNumBins += m_CABACWriter.getNumBins();
}

} // namespace vvenc

//! \}


Coverage Report

Created: 2026-06-10 07:00