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

Source
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/** \file     EncModeCtrl.cpp
    \brief    Encoder controller for trying out specific modes
*/

#include "EncCu.h"

#include "EncModeCtrl.h"
#include "CommonLib/RdCost.h"
#include "CommonLib/CodingStructure.h"
#include "CommonLib/Picture.h"
#include "CommonLib/UnitTools.h"
#include "CommonLib/dtrace_next.h"

#include <cmath>

//! \ingroup EncoderLib
//! \{

namespace vvenc {

void CacheBlkInfoCtrl::create(int ctuSize)
{
  const unsigned numPos = MAX_CU_SIZE >> MIN_CU_LOG2;
  const int maxSizeIdx  = MAX_CU_SIZE_IDX - MIN_CU_LOG2;

  //static constexpr size_t numCu = 7921;

  size_t numCu = 0;
  
  for( int wIdx = 0; wIdx < maxSizeIdx; wIdx++ )
  {
    for( int hIdx = 0; hIdx < maxSizeIdx; hIdx++ )
    {
      for( unsigned y = 0; y < numPos; y++ )
      {
        for( unsigned x = 0; x < numPos; x++ )
        {
          // a block of width W might be offset of N * W + 1/2 W (bcs of TT), same for H
          // W = 1 << ( wIdx + 2 )
          // 1/2 W = 1 << ( wIdx + 1 )
          // remainder of (N+1/2)*W -> x & ( ( 1 << ( wIdx + 1 ) ) - 1 )
  
          if( (x + (1 << (wIdx)) <= (ctuSize >> MIN_CU_LOG2))
              && (y + (1 << (hIdx)) <= (ctuSize >> MIN_CU_LOG2))
              && (((x << MIN_CU_LOG2) & ((1 << (wIdx + MIN_CU_LOG2 - 1)) - 1)) == 0)
              && (((y << MIN_CU_LOG2) & ((1 << (hIdx + MIN_CU_LOG2 - 1)) - 1)) == 0) )
          {
            numCu++;
          }
        }
      }
    }
  }

  m_codedCUInfoBuf = new CodedCUInfo[numCu];
  CodedCUInfo* cuInfo = m_codedCUInfoBuf;

  for( int wIdx = 0; wIdx < maxSizeIdx; wIdx++ )
  {
    for( int hIdx = 0; hIdx < maxSizeIdx; hIdx++ )
    {
      for( unsigned y = 0; y < numPos; y++ )
      {
        for( unsigned x = 0; x < numPos; x++ )
        {
          // a block of width W might be offset of N * W + 1/2 W (bcs of TT), same for H
          // W = 1 << ( wIdx + 2 )
          // 1/2 W = 1 << ( wIdx + 1 )
          // remainder of (N+1/2)*W -> x & ( ( 1 << ( wIdx + 1 ) ) - 1 )

          if(( x + (1<<(wIdx)) <= ( ctuSize >> MIN_CU_LOG2 ) )
            && ( y + (1<<(hIdx)) <= ( ctuSize >> MIN_CU_LOG2 ) )
            && ( ( ( x << MIN_CU_LOG2 ) & ((1 << (wIdx + MIN_CU_LOG2 - 1)) - 1) ) == 0 )
            && ( ( ( y << MIN_CU_LOG2 ) & ((1 << (hIdx + MIN_CU_LOG2 - 1)) - 1) ) == 0 ) )
          {
            m_codedCUInfo[wIdx][hIdx][x][y] = cuInfo++;
            m_codedCUInfo[wIdx][hIdx][x][y]->poc       = -1;
            m_codedCUInfo[wIdx][hIdx][x][y]->ctuRsAddr = -1;
          }
          else
          {
            m_codedCUInfo[wIdx][hIdx][x][y] = nullptr;
          }
        }
      }
    }
  }
}

void CacheBlkInfoCtrl::destroy()
{
  delete[] m_codedCUInfoBuf;
  m_codedCUInfoBuf = nullptr;
}

void CacheBlkInfoCtrl::init( const Slice &slice )
{
  m_pcv = slice.pps->pcv;
}

void CacheBlkInfoCtrl::initBlk( const UnitArea& area, int poc )
{
  unsigned idx1, idx2, idx3, idx4;
  getAreaIdxNew( area.Y(), *m_pcv, idx1, idx2, idx3, idx4 );

  const int ctuRsAddr = getCtuAddr( area.lumaPos(), *m_pcv );
  CodedCUInfo* cuInfo = m_codedCUInfo[idx1][idx2][idx3][idx4];

  if( cuInfo->poc != poc || cuInfo->ctuRsAddr != ctuRsAddr )
  {
    GCC_WARNING_DISABLE_class_memaccess
    memset( cuInfo, 0, sizeof( CodedCUInfo ) );
    GCC_WARNING_RESET

    cuInfo->poc       = poc;
    cuInfo->ctuRsAddr = ctuRsAddr;
  }
}

CodedCUInfo& CacheBlkInfoCtrl::getBlkInfo( const UnitArea& area )
{
  unsigned idx1, idx2, idx3, idx4;
  getAreaIdxNew( area.Y(), *m_pcv, idx1, idx2, idx3, idx4 );
//  DTRACE( g_trace_ctx, D_TMP, "%d loc %d %d %d %d\n", g_trace_ctx->getChannelCounter(D_TMP), idx1, idx2, idx3, idx4);
  return *m_codedCUInfo[idx1][idx2][idx3][idx4];
}

void CodedCUInfo::setMv( const RefPicList refPicList, const int iRefIdx, const Mv& rMv )
{
  if( iRefIdx >= MAX_STORED_CU_INFO_REFS ) return;

  saveMv [refPicList][iRefIdx] = rMv;
  validMv[refPicList][iRefIdx] = true;
}

bool CodedCUInfo::getMv( const RefPicList refPicList, const int iRefIdx, Mv& rMv ) const
{
  if( iRefIdx >= MAX_STORED_CU_INFO_REFS )
  {
    rMv = saveMv[refPicList][0];
    return false;
  }

  rMv = saveMv[refPicList][iRefIdx];
  return validMv[refPicList][iRefIdx];
}

uint8_t CacheBlkInfoCtrl::findBestSbt( const UnitArea& area, const uint32_t curPuSse )
{
  unsigned idx1, idx2, idx3, idx4;
  getAreaIdxNew( area.Y(), *m_pcv, idx1, idx2, idx3, idx4 );
  CodedCUInfo* pSbtSave = m_codedCUInfo[idx1][idx2][idx3][idx4];

  for( int i = 0; i < pSbtSave->numPuInfoStored; i++ )
  {
    if( curPuSse == pSbtSave->puSse[i] )
    {
      return pSbtSave->puSbt[i];
    }
  }

  return MAX_UCHAR;
}

bool CacheBlkInfoCtrl::saveBestSbt( const UnitArea& area, const uint32_t curPuSse, const uint8_t curPuSbt )
{
  unsigned idx1, idx2, idx3, idx4;
  getAreaIdxNew( area.Y(), *m_pcv, idx1, idx2, idx3, idx4 );
  CodedCUInfo* pSbtSave = m_codedCUInfo[idx1][idx2][idx3][idx4];

  if( pSbtSave->numPuInfoStored == SBT_NUM_SL )
  {
    return false;
  }

  pSbtSave->puSse[pSbtSave->numPuInfoStored] = curPuSse;
  pSbtSave->puSbt[pSbtSave->numPuInfoStored] = curPuSbt;
  pSbtSave->numPuInfoStored++;

  return true;
}

static bool isTheSameNbHood( const CodingUnit &cu, const CodingStructure& cs, const Partitioner &partitioner, int picW, int picH )
{
  if( cu.chType != partitioner.chType )
  {
    return false;
  }

  const PartitioningStack &ps = partitioner.getPartStack();

  int i = 1;

  for( ; i < ps.size(); i++ )
  {
    if( ps[i].split != CU::getSplitAtDepth( cu, i - 1 ) )
    {
      break;
    }
  }

  const UnitArea& cmnAnc = ps[i - 1].parts[ps[i - 1].idx];
  const UnitArea cuArea  = CS::getArea( cs, cu, partitioner.chType, partitioner.treeType );

  for( int i = 0; i < cmnAnc.blocks.size(); i++ )
  {
    if( i < cuArea.blocks.size() && cuArea.blocks[i].valid() && cuArea.blocks[i].pos() != cmnAnc.blocks[i].pos() )
    {
      return false;
    }
  }

  return true;
}

void BestEncInfoCache::create( const bool reuseCuResults, const ChromaFormat chFmt, const int ctuSize )
{
  m_reuseCuResults = reuseCuResults;

  if( !m_reuseCuResults ) return;

  m_chFmt = chFmt;
  std::fill_n( &m_bestEncInfo[0][0][0][0], sizeof( m_bestEncInfo ) / sizeof( m_bestEncInfo[0][0][0][0] ), nullptr );
}

void BestEncInfoCache::destroy()
{
  if( !m_reuseCuResults ) return;

  std::fill_n( &m_bestEncInfo[0][0][0][0], sizeof( m_bestEncInfo ) / sizeof( m_bestEncInfo[0][0][0][0] ), nullptr );
  m_filledSlots.clear();
  m_entryArena.release();
  m_coeffArena.release();
  m_dmvrMvArena.release();

  m_pcv = nullptr;
}

void BestEncInfoCache::init( const Slice &slice )
{
  if( !m_reuseCuResults ) return;

  // A new CTU starts, and no result of the previous one can match its CUs.
  for( BestEncodingInfo** slot : m_filledSlots )
  {
    *slot = nullptr;
  }
  m_filledSlots.clear();
  m_entryArena.reset();
  m_coeffArena.reset();
  m_dmvrMvArena.reset();

  bool isInitialized = m_pcv;

  m_pcv = slice.pps->pcv;

  if( isInitialized ) return;

  m_dummyCS.pcv = m_pcv;
}

// Takes storage for the result of a CU with size indices wIdx and hIdx, set up the way the earlier
// fixed table of results was set up when it was created.
BestEncodingInfo* BestEncInfoCache::xNewEntry( const int wIdx, const int hIdx )
{
  BestEncodingInfo* encInfo = m_entryArena.take( 1 );
  encInfo->~BestEncodingInfo();
  new( encInfo ) BestEncodingInfo();

  const UnitArea area( m_chFmt, Area( 0, 0, 1 << ( wIdx + MIN_CU_LOG2 ), 1 << ( hIdx + MIN_CU_LOG2 ) ) );

  encInfo->cu.UnitArea::operator=( area );
  encInfo->tu.UnitArea::operator=( area );

  encInfo->cu.chType   = CH_L;
  encInfo->cu.treeType = TREE_D;
  encInfo->cu.modeType = MODE_TYPE_ALL;
  encInfo->cu.qp       = MAX_SCHAR;
  encInfo->tu.chType   = CH_L;

  if( hIdx >= 1 && wIdx >= 1 && ( wIdx + hIdx ) >= 3 )
  {
    const int dmvrSize = ( 1 << std::max( 0, ( wIdx + MIN_CU_LOG2 - DMVR_SUBCU_SIZE_LOG2 ) ) ) * ( 1 << std::max( 0, ( hIdx + MIN_CU_LOG2 - DMVR_SUBCU_SIZE_LOG2 ) ) );
    encInfo->cu.mvdL0SubPu = m_dmvrMvArena.take( dmvrSize );
  }

  TCoeffSig* coeff[MAX_NUM_TBLOCKS] = { 0, };
  for( int i = 0; i < area.blocks.size(); i++ )
  {
    coeff[i] = m_coeffArena.take( area.blocks[i].area() );
  }

  encInfo->tu.cs = &m_dummyCS;
  encInfo->tu.init( coeff );

  encInfo->poc      = -1;
  encInfo->testMode = EncTestMode();
  return encInfo;
}

bool BestEncInfoCache::setFromCs( const CodingStructure& cs, const EncTestMode& testMode, const Partitioner& partitioner )
{
  if( !m_reuseCuResults ) return false;

  if( cs.cus.size() != 1 || cs.tus.size() != 1 || partitioner.maxBTD <= 1 )
  {
    return false;
  }

  unsigned idx1, idx2, idx3, idx4;
  getAreaIdxNew( cs.area.Y(), *m_pcv, idx1, idx2, idx3, idx4 );

  BestEncodingInfo*& slot = m_bestEncInfo[idx1][idx2][idx3][idx4];
  if( !slot )
  {
    slot = xNewEntry( idx1, idx2 );
    m_filledSlots.push_back( &slot );
  }
  BestEncodingInfo& encInfo = *slot;

  encInfo.poc            =  cs.picture->poc;
  encInfo.cu.UnitArea::operator= ( *cs.cus.front() );
  encInfo.tu.UnitArea::operator= ( *cs.tus.front() );
  encInfo.cu             = *cs.cus.front();
  for( auto &blk : cs.tus.front()->blocks )
  {
    if( blk.valid() ) encInfo.tu.copyComponentFrom( *cs.tus.front(), blk.compID );
  }
  encInfo.testMode       = testMode;
  encInfo.dist           = cs.dist;
  encInfo.costEDO        = cs.costDbOffset;

  return true;
}

bool BestEncInfoCache::isReusingCuValid( const CodingStructure& cs, const Partitioner& partitioner, int qp )
{
  if( !m_reuseCuResults || partitioner.treeType == TREE_C || partitioner.maxBTD <= 1 )
  {
    return false; //if save & load is allowed for chroma CUs, we should check whether luma info (pred, recon, etc) is the same, which is quite complex
  }

  unsigned idx1, idx2, idx3, idx4;
  getAreaIdxNew( cs.area.Y(), *m_pcv, idx1, idx2, idx3, idx4 );

  const BestEncodingInfo* stored = m_bestEncInfo[idx1][idx2][idx3][idx4];
  if( !stored )
  {
    return false;
  }
  const BestEncodingInfo& encInfo = *stored;

  if( encInfo.cu.treeType != partitioner.treeType || encInfo.cu.modeType != partitioner.modeType )
  {
    return false;
  }
  if( encInfo.cu.qp != qp )
    return false;
  if( cs.picture->poc != encInfo.poc 
    || CS::getArea( cs, cs.area, partitioner.chType, partitioner.treeType ) != CS::getArea( cs, encInfo.cu, partitioner.chType, partitioner.treeType ) 
    || !isTheSameNbHood( encInfo.cu, cs, partitioner, (cs.picture->Y().width), (cs.picture->Y().height))
    || CU::isIBC(encInfo.cu)
    || partitioner.currQgEnable() || cs.currQP[partitioner.chType] != encInfo.cu.qp
    )
  {
    return false;
  }
  else
  {
    return true;
  }
}

bool BestEncInfoCache::setCsFrom( CodingStructure& cs, EncTestMode& testMode, const Partitioner& partitioner ) const
{
  if( !m_reuseCuResults ) return false;

  unsigned idx1, idx2, idx3, idx4;
  getAreaIdxNew( cs.area.Y(), *m_pcv, idx1, idx2, idx3, idx4 );

  const BestEncodingInfo* stored = m_bestEncInfo[idx1][idx2][idx3][idx4];
  if( !stored )
  {
    return false;
  }
  const BestEncodingInfo& encInfo = *stored;

  if( cs.picture->poc != encInfo.poc 
    || CS::getArea( cs, cs.area, partitioner.chType, partitioner.treeType ) != CS::getArea( cs, encInfo.cu, partitioner.chType, partitioner.treeType ) 
    || !isTheSameNbHood( encInfo.cu, cs, partitioner, (cs.picture->Y().width), (cs.picture->Y().height))
    || partitioner.currQgEnable() || cs.currQP[partitioner.chType] != encInfo.cu.qp
    )
  {
    return false;
  }

  const UnitArea ua = CS::getArea( cs, cs.area, partitioner.chType, partitioner.treeType );
  CodingUnit     &cu = cs.addCU( ua, partitioner.chType );
  cu.treeType = partitioner.treeType;
  cu.modeType = partitioner.modeType;
  cu.initPuData();
  TransformUnit  &tu = cs.addTU( ua, partitioner.chType, &cu );

  cu          .repositionTo( encInfo.cu );
  cu          .repositionTo( encInfo.cu );
  tu          .repositionTo( encInfo.tu );

  cu          = encInfo.cu;
  cu          = encInfo.cu;
  for( auto &blk : tu.blocks )
  {
    if( blk.valid() ) tu.copyComponentFrom( encInfo.tu, blk.compID );
  }

  testMode    = encInfo.testMode;
  cs.dist     = encInfo.dist;
  cs.costDbOffset = encInfo.costEDO;
  return true;
}


//////////////////////////////////////////////////////////////////////////
// EncModeCtrl
//////////////////////////////////////////////////////////////////////////
void EncModeCtrl::init( const VVEncCfg& encCfg, RdCost* pRdCost )
{
  m_pcEncCfg = &encCfg;
  m_pcRdCost = pRdCost;
  comprCUCtx = nullptr;

  CacheBlkInfoCtrl::create( encCfg.m_CTUSize );
  BestEncInfoCache::create( encCfg.m_reuseCuResults, encCfg.m_internChromaFormat, encCfg.m_CTUSize );
}

void EncModeCtrl::destroy()
{
  CacheBlkInfoCtrl::destroy();
  BestEncInfoCache::destroy();
}

void EncModeCtrl::initCTUEncoding( const Slice &slice, int tileIdx )
{
  CacheBlkInfoCtrl::init( slice );
  BestEncInfoCache::init( slice );

  CHECK( !m_ComprCUCtxList.empty(), "Mode list is not empty at the beginning of a CTU" );

  if( m_pcEncCfg->m_fastQtBtEnc )
  {
    m_skipThresholdE0023FastEnc = ((slice.getMinPictureDistance() <= PICTURE_DISTANCE_TH) ? FAST_SKIP_DEPTH : SKIP_DEPTH);
  }
  else
  {
    m_skipThresholdE0023FastEnc = SKIP_DEPTH;
  }

  m_tileIdx = tileIdx;
}

void EncModeCtrl::initCULevel( Partitioner &partitioner, const CodingStructure& cs, int  MergeSimpleFlag)
{
  // Min/max depth
  unsigned minDepth = 0;
  unsigned maxDepth = cs.pcv->getMaxDepth( cs.slice->sliceType, partitioner.chType );
  if( m_pcEncCfg->m_useFastLCTU )
  {
    partitioner.setMaxMinDepth(minDepth, maxDepth, cs, cs.picture->useQtbttSpeedUpMode, MergeSimpleFlag);
  }

  minDepth = std::max<unsigned>( minDepth, cs.pcv->getMinDepth( cs.slice->sliceType, partitioner.chType ) );
  maxDepth = std::min<unsigned>( maxDepth, cs.pcv->getMaxDepth( cs.slice->sliceType, partitioner.chType ) );

  m_ComprCUCtxList.push_back( ComprCUCtx( cs, minDepth, maxDepth ) );
  comprCUCtx = &m_ComprCUCtxList.back();

  const CodingUnit* cuLeft  = cs.getCURestricted( cs.area.blocks[partitioner.chType].pos().offset( -1, 0 ), cs.area.blocks[partitioner.chType].pos(), cs.slice->independentSliceIdx, m_tileIdx, partitioner.chType, partitioner.treeType );
  const CodingUnit* cuAbove = cs.getCURestricted( cs.area.blocks[partitioner.chType].pos().offset( 0, -1 ), cs.area.blocks[partitioner.chType].pos(), cs.slice->independentSliceIdx, m_tileIdx, partitioner.chType, partitioner.treeType );

  const bool qtBeforeBt = ( (  cuLeft  &&  cuAbove  && cuLeft ->qtDepth > partitioner.currQtDepth && cuAbove->qtDepth > partitioner.currQtDepth )
                         || (  cuLeft  && !cuAbove  && cuLeft ->qtDepth > partitioner.currQtDepth )
                         || ( !cuLeft  &&  cuAbove  && cuAbove->qtDepth > partitioner.currQtDepth )
                         || ( !cuAbove && !cuLeft   && cs.area.lwidth() >= ( 32 << cs.slice->TLayer ) )
                         || ( m_pcEncCfg->m_qtbttSpeedUp > 1 && partitioner.maxBTD < ( ( cs.slice->isIntra() && !cs.sps->IBC ) ? 3 : 2 ) ) )
                         && ( cs.area.lwidth() > ( cs.pcv->getMinQtSize( *cs.slice, partitioner.chType ) << 1 ) );

  // set features
  ComprCUCtx &cuECtx    = *comprCUCtx;
  cuECtx.qtBeforeBt     = qtBeforeBt;
  cuECtx.doTriHorzSplit = true;
  cuECtx.doTriVertSplit = true;
  cuECtx.doMoreSplits   = 3;
  cuECtx.isReusingCu    = isReusingCuValid( cs, partitioner, cs.baseQP );
  cuECtx.didHorzSplit   = partitioner.canSplit( CU_HORZ_SPLIT, cs );
  cuECtx.didVertSplit   = partitioner.canSplit( CU_VERT_SPLIT, cs );
  cuECtx.doHorChromaSplit = true;
  cuECtx.doVerChromaSplit = true;
  cuECtx.doQtChromaSplit  = true;

  if( m_pcEncCfg->m_contentBasedFastQtbt && cs.pcv->getMaxMTTDepth(*cs.slice, partitioner.chType))
  {
    const CompArea& currArea = partitioner.currArea().Y();
    int cuHeight  = currArea.height;
    int cuWidth   = currArea.width;

    const bool condIntraInter = m_pcEncCfg->m_IntraPeriod == 1 ? ( partitioner.currBtDepth == 0 ) : ( cuHeight > 32 && cuWidth > 32 );

    if( cuWidth == cuHeight && condIntraInter )
    {
      const CPelBuf bufCurrArea = cs.getOrgBuf( partitioner.currArea().block( COMP_Y ) );

      Intermediate_Int horVal = 0;
      Intermediate_Int verVal = 0;
      Intermediate_Int dupVal = 0;
      Intermediate_Int dowVal = 0;

      unsigned j, k;

      for( k = 0; k < cuHeight - 1; k++ )
      {
        for( j = 0; j < cuWidth - 1; j++ )
        {
          horVal += abs( bufCurrArea.at( j + 1, k     ) - bufCurrArea.at( j, k ) );
          verVal += abs( bufCurrArea.at( j    , k + 1 ) - bufCurrArea.at( j, k ) );
          dowVal += abs( bufCurrArea.at( j + 1, k )     - bufCurrArea.at( j, k + 1 ) );
          dupVal += abs( bufCurrArea.at( j + 1, k + 1 ) - bufCurrArea.at( j, k ) );
        }
      }

      cuECtx.grad_horVal = (double)horVal;
      cuECtx.grad_verVal = (double)verVal;
      cuECtx.grad_dowVal = (double)dowVal;
      cuECtx.grad_dupVal = (double)dupVal;
    }
  }
}

void EncModeCtrl::finishCULevel( Partitioner &partitioner )
{
  m_ComprCUCtxList.pop_back();
  comprCUCtx = m_ComprCUCtxList.size() ? &m_ComprCUCtxList.back() : nullptr;
}

bool EncModeCtrl::trySplit( const EncTestMode& encTestmode, const CodingStructure &cs, Partitioner& partitioner, const EncTestMode& lastTestmode )
{
  ComprCUCtx& cuECtx = *comprCUCtx;

  const PartSplit implicitSplit = partitioner.getImplicitSplit( cs );
  const bool isBoundary         = implicitSplit != CU_DONT_SPLIT;

  if( ( m_pcEncCfg->m_IntraPeriod == 1 ) && ( partitioner.chType == CH_C ) && ( !cuECtx.doQtChromaSplit ) )
  {
    cuECtx.maxDepth         = partitioner.currDepth;
  }

  if( isBoundary )
  {
    if( encTestmode.type != ETM_SPLIT_QT )
    {
      return getPartSplit( encTestmode ) == implicitSplit;
    }
    else
    {
      return partitioner.canSplit( CU_QUAD_SPLIT, cs );
    }
  }

  const Slice&           slice       = *cs.slice;
  const uint32_t         width       = partitioner.currArea().lumaSize().width;
  const CodingStructure *bestCS      = cuECtx.bestCS;
  const CodingUnit      *bestCU      = cuECtx.bestCU;

  if( cuECtx.minDepth > partitioner.currQtDepth && partitioner.canSplit( CU_QUAD_SPLIT, cs ) )
  {
    // enforce QT
    return encTestmode.type == ETM_SPLIT_QT;
  }
  else if( encTestmode.type == ETM_SPLIT_QT && cuECtx.maxDepth <= partitioner.currQtDepth )
  {
    // don't check this QT depth
    return false;
  }

  CHECK( ! isModeSplit( encTestmode ), "wrong method" );

  //////////////////////////////////////////////////////////////////////////
  // skip-history rule - don't split further if at least for three past levels
  //                     in the split tree it was found that skip is the best mode
  //////////////////////////////////////////////////////////////////////////
  int skipScore = 0;

  if ((!slice.isIntra() || slice.sps->IBC) && cuECtx.isBestNoSplitSkip )
  {
    for( int i = 2; i <= m_ComprCUCtxList.size(); i++ )
    {
      if( ( m_ComprCUCtxList.end() - i )->isBestNoSplitSkip )
      {
        skipScore += 1;
      }
      else
      {
        break;
      }
    }
  }

  const PartSplit split = getPartSplit( encTestmode );
  if( !partitioner.canSplit( split, cs ) || skipScore >= 2 || ( skipScore == 1 && m_ComprCUCtxList.size() == 2 ) )
  {
    if( split == CU_HORZ_SPLIT ) cuECtx.didHorzSplit = false;
    if( split == CU_VERT_SPLIT ) cuECtx.didVertSplit = false;
    if( split == CU_QUAD_SPLIT ) cuECtx.didQuadSplit = false;
    return false;
  }

  if( isChroma( partitioner.chType ) && !cuECtx.doHorChromaSplit && ( split == CU_HORZ_SPLIT || split == CU_TRIH_SPLIT ) )
  {
    if( split == CU_HORZ_SPLIT )
    {
      cuECtx.didHorzSplit = false;
    }

    return false;
  }

  if( isChroma( partitioner.chType ) && !cuECtx.doVerChromaSplit && ( split == CU_VERT_SPLIT || split == CU_TRIV_SPLIT ) )
  {
    if( split == CU_VERT_SPLIT )
    {
      cuECtx.didVertSplit = false;
    }

    return false;
  }

  if( m_pcEncCfg->m_contentBasedFastQtbt )
  {
    const CompArea& currArea = partitioner.currArea().Y();
    int cuHeight  = currArea.height;
    int cuWidth   = currArea.width;

    const bool condIntraInter = m_pcEncCfg->m_IntraPeriod == 1 ? ( partitioner.currBtDepth == 0 ) : ( cuHeight > 32 && cuWidth > 32 );

    if( cuWidth == cuHeight && condIntraInter && split != CU_QUAD_SPLIT )
    {
      const double th1 = m_pcEncCfg->m_IntraPeriod == 1 ?  1.2              :  1.0;
      const double th2 = m_pcEncCfg->m_IntraPeriod == 1 ? (1.2 / sqrt( 2 )) : (1.0 / sqrt( 2 ));

      if( cuECtx.grad_horVal > th1 * cuECtx.grad_verVal && cuECtx.grad_horVal > th2 * cuECtx.grad_dowVal && cuECtx.grad_horVal > th2 * cuECtx.grad_dupVal && ( split == CU_HORZ_SPLIT || split == CU_TRIH_SPLIT ) )
      {
        return false;
      }
      if( th2 * cuECtx.grad_dupVal < cuECtx.grad_verVal && th2 * cuECtx.grad_dowVal < cuECtx.grad_verVal && th1 * cuECtx.grad_horVal < cuECtx.grad_verVal && ( split == CU_VERT_SPLIT || split == CU_TRIV_SPLIT ) )
      {
        return false;
      }
    }

    if( m_pcEncCfg->m_IntraPeriod == 1 && cuWidth <= 32 && cuHeight <= 32 && bestCS && bestCS->tus.size() == 1 && bestCU && bestCU->depth == partitioner.currDepth && partitioner.currBtDepth > 1 && isLuma( partitioner.chType ) )
    {
      if( !bestCU->rootCbf )
      {
        return false;
      }
    }
  }

  if( m_pcEncCfg->m_qtbttSpeedUp > 1 )
  {
    const int availDepth = cs.pcv->getMaxMTTDepth( slice, partitioner.chType ) - partitioner.currMtDepth;
    if( bestCU && bestCU->skip && availDepth <= ( 3 - m_skipThresholdE0023FastEnc ) && !isModeSplit( lastTestmode ) && split != CU_QUAD_SPLIT )
    {
      return false;
    }
  }
  if( bestCU && bestCU->skip && bestCU->mtDepth >= m_skipThresholdE0023FastEnc && !isModeSplit( lastTestmode ) )
  {
    return false;
  }

  bool resetFeature = false;

  switch( split )
  {
    case CU_QUAD_SPLIT:
      {
        if( !cuECtx.qtBeforeBt && bestCU )
        {
          unsigned maxBTD        = cs.pcv->getMaxMTTDepth( slice, partitioner.chType );
          const CodingUnit *cuBR = bestCS->cus.back();
          unsigned height        = partitioner.currArea().lumaSize().height;

          if(((bestCU->btDepth == 0 && maxBTD >= ((slice.isIntra() && !slice.sps->IBC) ? 3 : 2))
            || (bestCU->btDepth == 1 && cuBR && cuBR->btDepth == 1 && maxBTD >= ((slice.isIntra() && !slice.sps->IBC) ? 4 : 3)))
            && (width <= MAX_TB_SIZEY && height <= MAX_TB_SIZEY)
            && cuECtx.didHorzSplit && cuECtx.didVertSplit )
          {
            return false;
          }
        }
        if( bestCS )
        {
          if( m_pcEncCfg->m_useEarlyCU == 2 && bestCS->cost != MAX_DOUBLE && bestCU && bestCU->skip && cuECtx.nonSkipWasTested && bestCS->cus.size() == 1 )
          {
            return false;
          }

          int stopSplit = (m_pcEncCfg->m_FastInferMerge >> 4) && (bestCS->slice->TLayer > 4);
          int limitBLsize = stopSplit ? 2048 : 1024;
          if((m_pcEncCfg->m_useEarlyCU == 1 || stopSplit) && bestCS->cost != MAX_DOUBLE && bestCU && bestCU->skip && partitioner.currArea().lumaSize().area() < limitBLsize )
          {
            return false;
          }
        }
      }
      break;
    case CU_HORZ_SPLIT:
    case CU_VERT_SPLIT:
      resetFeature = true;
      break;
    case CU_TRIH_SPLIT:
      if( cuECtx.didHorzSplit && bestCU && bestCU->btDepth == partitioner.currBtDepth && !bestCU->rootCbf )
      {
        return false;
      }

      if( m_pcEncCfg->m_qtbttSpeedUp > 1 )
      {
        //unsigned maxBTD = cs.pcv->getMaxMTTDepth( slice, partitioner.chType );
        if( /*maxBTD == 1 && */cuECtx.didHorzSplit && cuECtx.didVertSplit && cuECtx.bestCostHorzSplit > cuECtx.bestCostVertSplit )
        {
          return false;
        }
      }

      if( !cuECtx.doTriHorzSplit )
      {
        return false;
      }

      if (m_pcEncCfg->m_fastTTSplit && cuECtx.bestCostHorzSplit < MAX_DOUBLE)
      {
        if (cuECtx.bestCostBeforeSplit < MAX_DOUBLE && (cuECtx.bestCostHorzSplit > m_pcEncCfg->m_fastTT_th * cuECtx.bestCostBeforeSplit))
        {
          return false;
        }
        if (cuECtx.bestCostVertSplit < MAX_DOUBLE && (cuECtx.bestCostHorzSplit > m_pcEncCfg->m_fastTT_th * cuECtx.bestCostVertSplit))
        {
          return false;
        }
      }
      break;
    case CU_TRIV_SPLIT:
      if( cuECtx.didVertSplit && bestCU && bestCU->btDepth == partitioner.currBtDepth && !bestCU->rootCbf )
      {
        return false;
      }

      if( m_pcEncCfg->m_qtbttSpeedUp > 1 )
      {
        //unsigned maxBTD = cs.pcv->getMaxMTTDepth( slice, partitioner.chType );
        if( /*maxBTD == 1 && */cuECtx.didHorzSplit && cuECtx.didVertSplit && cuECtx.bestCostHorzSplit < cuECtx.bestCostVertSplit )
        {
          return false;
        }
      }

      if( !cuECtx.doTriVertSplit )
      {
        return false;
      }

      if (m_pcEncCfg->m_fastTTSplit && cuECtx.bestCostVertSplit < MAX_DOUBLE)
      {
        if (cuECtx.bestCostBeforeSplit < MAX_DOUBLE && (cuECtx.bestCostVertSplit > m_pcEncCfg->m_fastTT_th * cuECtx.bestCostBeforeSplit))
        {
          return false;
        }
        if (cuECtx.bestCostHorzSplit < MAX_DOUBLE && (cuECtx.bestCostVertSplit > m_pcEncCfg->m_fastTT_th * cuECtx.bestCostHorzSplit))
        {
          return false;
        }
      }
      break;
    default:
      THROW( "Only CU split modes are governed by the EncModeCtrl" );
      return false;
      break;
  }

  switch( split )
  {
    case CU_HORZ_SPLIT:
    case CU_TRIH_SPLIT:
      if( cuECtx.qtBeforeBt && cuECtx.didQuadSplit )
      {
        if( cuECtx.maxQtSubDepth > partitioner.currQtDepth + 1 )
        {
          if( resetFeature ) cuECtx.didHorzSplit = false;
          return false;
        }
      }
      break;
    case CU_VERT_SPLIT:
    case CU_TRIV_SPLIT:
      if( cuECtx.qtBeforeBt && cuECtx.didQuadSplit )
      {
        if( cuECtx.maxQtSubDepth > partitioner.currQtDepth + 1 )
        {
          if( resetFeature ) cuECtx.didVertSplit = false;
          return false;
        }
      }
      break;
    default:
      break;
  }

  if( split == CU_QUAD_SPLIT )
  {
    cuECtx.didQuadSplit = m_pcEncCfg->m_qtbttSpeedUp <= 1 || !!cuECtx.doMoreSplits;
  }

  return m_pcEncCfg->m_qtbttSpeedUp <= 1 || !!cuECtx.doMoreSplits;
}

bool EncModeCtrl::tryMode( const EncTestMode& encTestmode, const CodingStructure &cs, Partitioner& partitioner )
{
  CHECK( isModeSplit( encTestmode ), "wrong method");

  ComprCUCtx& cuECtx = m_ComprCUCtxList.back();

  if( cuECtx.minDepth > partitioner.currQtDepth && partitioner.canSplit( CU_QUAD_SPLIT, cs ) )
  {
    // enforce QT
    return false;
  }

  const Slice&           slice        = *cs.slice;
  const uint32_t         numComp      = getNumberValidComponents( slice.sps->chromaFormatIdc );
  const CodedCUInfo      &relatedCU   = getBlkInfo( partitioner.currArea() );
  const Area             &lumaArea    = partitioner.currArea().Y();
  const CodingStructure* bestCS       = cuECtx.bestCS;
  const EncTestMode      bestMode     = bestCS ?cuECtx.bestMode : EncTestMode();

  if( encTestmode.type == ETM_INTRA )
  {
    // if this is removed, the IntraSearch::xIntraCodingLumaQT needs to be adapted to support Intra TU split
    // also isXXAvailable in IntraPrediction.cpp need to be fixed to check availability within the same CU without isDecomp
    if (m_pcEncCfg->m_FastInferMerge && !slice.isIntra() && !slice.isIRAP() && !(cs.area.lwidth() == 4 && cs.area.lheight() == 4) && !partitioner.isConsIntra())
    {
      if (bestCS && (bestCS->slice->TLayer > (m_pcEncCfg->m_maxTLayer - (m_pcEncCfg->m_FastInferMerge & 7)))
        && (bestCS->bestParent != nullptr) && bestCS->bestParent->cus.size() && (bestCS->bestParent->cus[0]->skip))
      {
        return false;
      }
    }

    if( lumaArea.width > cs.sps->getMaxTbSize() || lumaArea.height > cs.sps->getMaxTbSize() )
    {
      return false;
    }

    if (m_pcEncCfg->m_usePbIntraFast && (!cs.slice->isIntra() || cs.slice->sps->IBC) && cuECtx.interHad == 0 && cuECtx.bestCU && !CU::isIntra(*cuECtx.bestCU))
    {
      return false;
    }

    // INTRA MODES
    if (cs.sps->IBC && !cuECtx.bestTU)
    {
     // return true;
    }
    else
    if( partitioner.isConsIntra() && !cuECtx.bestTU )
    {
      //return true;
    }
    else
    if ( lumaArea.width == 4 && lumaArea.height == 4 && !slice.isIntra() && !cuECtx.bestTU )
    {
      //return true;
    }
    else
    if (!(slice.isIRAP() || bestMode.type == ETM_INTRA || !cuECtx.bestTU ||
      ((!m_pcEncCfg->m_bDisableIntraCUsInInterSlices) && (!relatedCU.isInter || !relatedCU.isIBC) && (
                                    ( cuECtx.bestTU->cbf[0] != 0 ) ||
           ( ( numComp > COMP_Cb ) && cuECtx.bestTU->cbf[1] != 0 ) ||
           ( ( numComp > COMP_Cr ) && cuECtx.bestTU->cbf[2] != 0 )  // avoid very complex intra if it is unlikely
         ) ) ) )
    {
      return false;
    }
    else
    if( cuECtx.bestCS && cuECtx.bestCU && cuECtx.interHad )
    {
      // Get SATD threshold from best Inter-CU
      if( !cs.slice->isIRAP() && m_pcEncCfg->m_usePbIntraFast )
      {
        const DFunc dfunc = DF_HAD;
        DistParam distParam = m_pcRdCost->setDistParam( cs.getOrgBuf( COMP_Y ), cuECtx.bestCS->getPredBuf( COMP_Y ), cs.sps->bitDepths[ CH_L ], dfunc );
        cuECtx.interHad = distParam.distFunc( distParam );
      }
    }
    if ((m_pcEncCfg->m_IBCFastMethod > 1) && !cs.slice->isIntra()//IBC_FAST_METHOD_NOINTRA_IBCCBF0
      && (bestMode.type == ETM_IBC || bestMode.type == ETM_IBC_MERGE)
      && (!cuECtx.bestCU->Y().valid() || cuECtx.bestTU->cbf[0] == 0)
      && (!cuECtx.bestCU->Cb().valid() || cuECtx.bestTU->cbf[1] == 0)
      && (!cuECtx.bestCU->Cr().valid() || cuECtx.bestTU->cbf[2] == 0))
    {
      return false;
    }
    if (m_pcEncCfg->m_FastIntraTools)
    {
      if (relatedCU.relatedCuIsValid)
      {
        cuECtx.relatedCuIsValid = relatedCU.relatedCuIsValid;
      }
      if (relatedCU.isIntra)
      {
        cuECtx.isIntra = relatedCU.isIntra;
      }
    }
  }
  else if( isModeInter( encTestmode ) )
  {
    // INTER MODES (ME + MERGE/SKIP)
    CHECK( slice.isIntra(), "Inter-mode should not be in the I-Slice mode list!" );

    // --- Check if we can quit current mode using SAVE/LOAD coding history

    if( encTestmode.type == ETM_INTER_ME )
    {
      if( encTestmode.opts == ETO_STANDARD )
      {
        if (m_pcEncCfg->m_FastInferMerge)
        {
          if (bestCS && (bestCS->slice->TLayer > (m_pcEncCfg->m_maxTLayer - (m_pcEncCfg->m_FastInferMerge & 7)))
            && (bestCS->bestParent != nullptr) && bestCS->bestParent->cus.size() && (bestCS->bestParent->cus[0]->skip))
          {
            return false;
          }
        }
        if( relatedCU.isSkip || relatedCU.isIntra )
        {
          return false;
        }
      }
    }
  }
  else if (encTestmode.type == ETM_IBC || encTestmode.type == ETM_IBC_MERGE)
  {
    if ((m_pcEncCfg->m_IBCFastMethod > 1) && !(slice.isIRAP() || bestMode.type == ETM_INTRA || !cuECtx.bestTU ||
      ((!m_pcEncCfg->m_bDisableIntraCUsInInterSlices) && (!relatedCU.isInter || !relatedCU.isIBC) && (
        (cuECtx.bestTU->cbf[0] != 0) ||
        ((numComp > COMP_Cb) && cuECtx.bestTU->cbf[1] != 0) ||
        ((numComp > COMP_Cr) && cuECtx.bestTU->cbf[2] != 0)  // avoid very complex intra if it is unlikely
        ))))
    {
      return false;
    }
    if ((m_pcEncCfg->m_IBCFastMethod > 3) &&(lumaArea.width == 4 && lumaArea.height == 4 && !slice.isIntra()))
    {
      return false;
    }
    // IBC MODES
    return slice.sps->IBC && (partitioner.currArea().lumaSize().width < 128 && partitioner.currArea().lumaSize().height < 128);
  }
  else
  {
    THROW("problem");
    return false;
  }

  STAT_COUNT_CU_MODES( partitioner.chType == CH_L, g_cuCounters1D[CU_MODES_TRIED][0][!cs.slice->isIntra() + cs.slice->depth] );
  STAT_COUNT_CU_MODES( partitioner.chType == CH_L && !cs.slice->isIntra(), g_cuCounters2D[CU_MODES_TRIED][Log2( cs.area.lheight() )][Log2( cs.area.lwidth() )] );
  return true;
}


void EncModeCtrl::beforeSplit( Partitioner& partitioner )
{
  ComprCUCtx&           cuECtx  = m_ComprCUCtxList.back();

  if( ! cuECtx.bestCS )
    return;

  CodedCUInfo    &relatedCU   = getBlkInfo( partitioner.currArea() );
  const CodingUnit&  bestCU   = *cuECtx.bestCU;

  cuECtx.bestNsPredMode       = cuECtx.bestMode;
  cuECtx.bestCostBeforeSplit  = cuECtx.bestCS->cost;

  setFromCs( *cuECtx.bestCS, cuECtx.bestMode, partitioner );

  if( bestCU.skip )
  {
    cuECtx.doMoreSplits--;
  }

  if( partitioner.modeType == MODE_TYPE_INTRA && partitioner.chType == CH_L )
  {
    return; //not set best coding mode for intra coding pass
  }

  // assume the non-split modes are done and set the marks for the best found mode
  if( CU::isInter( bestCU ) )
  {
    relatedCU.isInter     = true;
    relatedCU.isSkip     |= bestCU.skip;
    relatedCU.isMMVDSkip |= bestCU.mmvdSkip;
    relatedCU.BcwIdx      = bestCU.BcwIdx;
  }
  else if (CU::isIBC(bestCU))
  {
    relatedCU.isIBC = true;
    relatedCU.isSkip |= bestCU.skip;
  }
  else if( CU::isIntra( bestCU ) )
  {
    relatedCU.isIntra     = true;
    if (m_pcEncCfg->m_FastIntraTools)
    {
      if ( cuECtx.intraWasTested && (!relatedCU.relatedCuIsValid || cuECtx.bestCS->cost < relatedCU.bestCost))
      {
        relatedCU.bestCost = cuECtx.bestCS->cost;
        relatedCU.relatedCuIsValid = true;
      }
    }
  }
  cuECtx.isBestNoSplitSkip = bestCU.skip;
}


bool EncModeCtrl::useModeResult( const EncTestMode& encTestmode, CodingStructure*& tempCS, Partitioner& partitioner, const bool useEDO )
{
  ComprCUCtx& cuECtx = m_ComprCUCtxList.back();


  if(      encTestmode.type == ETM_SPLIT_BT_H )
  {
    cuECtx.bestCostHorzSplit = tempCS->cost;
  }
  else if( encTestmode.type == ETM_SPLIT_BT_V )
  {
    cuECtx.bestCostVertSplit = tempCS->cost;
  }
  else if( !isModeSplit( encTestmode ) && isModeInter( encTestmode ) && tempCS->cus.size() == 1 )
  {
    cuECtx.nonSkipWasTested |= !tempCS->cus.front()->skip;
  }
  if (m_pcEncCfg->m_AMVRspeed && encTestmode.type == ETM_INTER_ME)
  {
    int imvMode = (encTestmode.opts & ETO_IMV) >> ETO_IMV_SHIFT;

    if (imvMode == 0)
    {
      if (tempCS->cost < cuECtx.bestCostNoImv )
      {
        cuECtx.bestCostNoImv = tempCS->cost;
      }
    }
  }

  if( encTestmode.type == ETM_SPLIT_QT )
  {
    int maxQtD = 0;
    for( const auto& cu : tempCS->cus )
    {
      maxQtD = std::max<int>( maxQtD, cu->qtDepth );
    }
    cuECtx.maxQtSubDepth = maxQtD;
  }

  int maxMtD = tempCS->pcv->getMaxMTTDepth( *tempCS->slice, partitioner.chType ) + partitioner.currImplicitBtDepth;

  if( encTestmode.type == ETM_SPLIT_BT_H )
  {
    if( tempCS->cus.size() > 2 )
    {
      int h_2   = tempCS->area.blocks[partitioner.chType].height / 2;
      int cu1_h = tempCS->cus.front()->blocks[partitioner.chType].height;
      int cu2_h = tempCS->cus.back() ->blocks[partitioner.chType].height;

      cuECtx.doTriHorzSplit = cu1_h < h_2 || cu2_h < h_2 || partitioner.currMtDepth + 1 == maxMtD;
    }
  }
  else if( encTestmode.type == ETM_SPLIT_BT_V )
  {
    if( tempCS->cus.size() > 2 )
    {
      int w_2   = tempCS->area.blocks[partitioner.chType].width / 2;
      int cu1_w = tempCS->cus.front()->blocks[partitioner.chType].width;
      int cu2_w = tempCS->cus.back() ->blocks[partitioner.chType].width;

      cuECtx.doTriVertSplit = cu1_w < w_2 || cu2_w < w_2 || partitioner.currMtDepth + 1 == maxMtD;
    }
  }

  if( encTestmode.type == ETM_SPLIT_BT_V || encTestmode.type == ETM_SPLIT_BT_H || encTestmode.type == ETM_SPLIT_QT )
  {
    bool isAllSkip = true;

    for( const auto& cu : tempCS->cus )
    {
      isAllSkip &= cu->skip;
    }

    if( isAllSkip ) cuECtx.doMoreSplits--;
    if( isAllSkip && encTestmode.type == ETM_SPLIT_QT )
                    cuECtx.doMoreSplits--;
  }

  // for now just a simple decision based on RD-cost or choose tempCS if bestCS is not yet coded
  if( tempCS->cost != MAX_DOUBLE && ( !cuECtx.bestCS || ( ( tempCS->cost + ( useEDO ? tempCS->costDbOffset : 0 ) ) < ( cuECtx.bestCS->cost + ( useEDO ? cuECtx.bestCS->costDbOffset : 0 ) ) ) ) )
  {
    cuECtx.bestCS   = tempCS;
    cuECtx.bestCU   = tempCS->cus[0];
    cuECtx.bestTU   = cuECtx.bestCU->firstTU;
    cuECtx.bestMode = encTestmode;

    return true;
  }
  else
  {
    return false;
  }
}

} // namespace vvenc

//! \}


Coverage Report

Created: 2026-10-17 06:56