IntraSearch.cpp 80.5 KB
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      //----- determine rate and r-d cost -----
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      csSplit->fracBits = xGetIntraFracBitsQT( *csSplit, partitioner, true, false, cu.ispMode ? 0 : -1, ispType );
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      //--- update cost ---
      csSplit->cost     = m_pcRdCost->calcRdCost(csSplit->fracBits, csSplit->dist);
    }
  }

  if( csFull || csSplit )
  {
    {
      // otherwise this would've happened in useSubStructure
      cs.picture->getRecoBuf( currArea.Y() ).copyFrom( cs.getRecoBuf( currArea.Y() ) );
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      cs.picture->getPredBuf( currArea.Y() ).copyFrom( cs.getPredBuf( currArea.Y() ) );
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    }

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    if( cu.ispMode && earlySkipISP )
    {
      cs.cost = MAX_DOUBLE;
    }
    else
    {
      cs.cost = m_pcRdCost->calcRdCost( cs.fracBits, cs.dist );
    }
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  }
}

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ChromaCbfs IntraSearch::xRecurIntraChromaCodingQT( CodingStructure &cs, Partitioner& partitioner, const double bestCostSoFar, const PartSplit ispType )
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{
  UnitArea currArea                   = partitioner.currArea();
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  const bool keepResi                 = cs.sps->getUseLMChroma() || KEEP_PRED_AND_RESI_SIGNALS;
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  if( !currArea.Cb().valid() ) return ChromaCbfs( false );


  TransformUnit &currTU               = *cs.getTU( currArea.chromaPos(), CHANNEL_TYPE_CHROMA );
  const PredictionUnit &pu            = *cs.getPU( currArea.chromaPos(), CHANNEL_TYPE_CHROMA );

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  bool lumaUsesISP                    = !CS::isDualITree( cs ) && currTU.cu->ispMode;
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  uint32_t     currDepth                  = partitioner.currTrDepth;
  const PPS &pps                      = *cs.pps;
  ChromaCbfs cbfs                     ( false );

  if (currDepth == currTU.depth)
  {
    if (!currArea.Cb().valid() || !currArea.Cr().valid())
    {
      return cbfs;
    }


    CodingStructure &saveCS = *m_pSaveCS[1];
    saveCS.pcv      = cs.pcv;
    saveCS.picture  = cs.picture;
    saveCS.area.repositionTo( cs.area );
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    saveCS.initStructData( MAX_INT, false, true );
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    if( !CS::isDualITree( cs ) && currTU.cu->ispMode )
    {
      saveCS.clearCUs();
      CodingUnit& auxCU = saveCS.addCU( *currTU.cu, partitioner.chType );
      auxCU.ispMode = currTU.cu->ispMode;
      saveCS.sps = currTU.cs->sps;
      saveCS.clearPUs();
      saveCS.addPU( *currTU.cu->firstPU, partitioner.chType );
    }

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    TransformUnit &tmpTU = saveCS.addTU(currArea, partitioner.chType);


    cs.setDecomp(currArea.Cb(), true); // set in advance (required for Cb2/Cr2 in 4:2:2 video)

    const unsigned      numTBlocks  = ::getNumberValidTBlocks( *cs.pcv );

    for( uint32_t c = COMPONENT_Cb; c < numTBlocks; c++)
    {
      const ComponentID compID  = ComponentID(c);
      const CompArea&   area    = currTU.blocks[compID];

      double     dSingleCost    = MAX_DOUBLE;
      int        bestModeId     = 0;
      Distortion singleDistC    = 0;
      Distortion singleDistCTmp = 0;
      double     singleCostTmp  = 0;

      const bool checkCrossComponentPrediction = PU::isChromaIntraModeCrossCheckMode( pu ) && pps.getPpsRangeExtension().getCrossComponentPredictionEnabledFlag() && TU::getCbf( currTU, COMPONENT_Y );

      const int  crossCPredictionModesToTest = checkCrossComponentPrediction ? 2 : 1;
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      const int  totalModesToTest            = crossCPredictionModesToTest;
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      const bool isOneMode                   = (totalModesToTest == 1);

      int currModeId = 0;
      int default0Save1Load2 = 0;

      TempCtx ctxStart  ( m_CtxCache );
      TempCtx ctxBest   ( m_CtxCache );

      if (!isOneMode)
      {
        ctxStart = m_CABACEstimator->getCtx();
      }

      {
        for (int crossCPredictionModeId = 0; crossCPredictionModeId < crossCPredictionModesToTest; crossCPredictionModeId++)
        {
          currTU.compAlpha    [compID] = 0;

          currModeId++;

          const bool isFirstMode = (currModeId == 1);
          const bool isLastMode  = (currModeId == totalModesToTest); // currModeId is indexed from 1

          if (isOneMode)
          {
            default0Save1Load2 = 0;
          }
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          else if (!isOneMode && (crossCPredictionModeId == 0))
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          {
            default0Save1Load2 = 1; //save prediction on first mode
          }
          else
          {
            default0Save1Load2 = 2; //load it on subsequent modes
          }

          if (!isFirstMode) // if not first mode to be tested
          {
            m_CABACEstimator->getCtx() = ctxStart;
          }

          singleDistCTmp = 0;

          xIntraCodingTUBlock( currTU, compID, crossCPredictionModeId != 0, singleDistCTmp, default0Save1Load2 );

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          if( ( ( crossCPredictionModeId == 1 ) && ( currTU.compAlpha[compID] == 0 ) ) ) //In order not to code TS flag when cbf is zero, the case for TS with cbf being zero is forbidden.
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          {
            singleCostTmp = MAX_DOUBLE;
          }
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          else if( lumaUsesISP && bestCostSoFar != MAX_DOUBLE && c == COMPONENT_Cb )
          {
            uint64_t fracBitsTmp = xGetIntraFracBitsQTSingleChromaComponent( cs, partitioner, ComponentID( c ) );
            singleCostTmp = m_pcRdCost->calcRdCost( fracBitsTmp, singleDistCTmp );
            if( isOneMode || ( !isOneMode && !isLastMode ) )
            {
              m_CABACEstimator->getCtx() = ctxStart;
            }
          }
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          else if( !isOneMode )
          {
            uint64_t fracBitsTmp = xGetIntraFracBitsQTChroma( currTU, compID );
            singleCostTmp = m_pcRdCost->calcRdCost( fracBitsTmp, singleDistCTmp );
          }

          if( singleCostTmp < dSingleCost )
          {
            dSingleCost = singleCostTmp;
            singleDistC = singleDistCTmp;
            bestModeId  = currModeId;

            if( !isLastMode )
            {
#if KEEP_PRED_AND_RESI_SIGNALS
              saveCS.getPredBuf   (area).copyFrom(cs.getPredBuf   (area));
              saveCS.getOrgResiBuf(area).copyFrom(cs.getOrgResiBuf(area));
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#endif
              saveCS.getPredBuf   (area).copyFrom(cs.getPredBuf   (area));
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              if( keepResi )
              {
                saveCS.getResiBuf (area).copyFrom(cs.getResiBuf   (area));
              }
              saveCS.getRecoBuf   (area).copyFrom(cs.getRecoBuf   (area));

              tmpTU.copyComponentFrom(currTU, compID);

              ctxBest = m_CABACEstimator->getCtx();
            }
          }
        }
      }

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      if( lumaUsesISP && dSingleCost > bestCostSoFar && c == COMPONENT_Cb )
      {
        //Luma + Cb cost is already larger than the best cost, so we don't need to test Cr
        cs.dist = MAX_UINT;
        m_CABACEstimator->getCtx() = ctxStart;
        break;
        //return cbfs;
      }

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      if (bestModeId < totalModesToTest)
      {
#if KEEP_PRED_AND_RESI_SIGNALS
        cs.getPredBuf   (area).copyFrom(saveCS.getPredBuf   (area));
        cs.getOrgResiBuf(area).copyFrom(saveCS.getOrgResiBuf(area));
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#endif
        cs.getPredBuf   (area).copyFrom(saveCS.getPredBuf   (area));
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        if( keepResi )
        {
          cs.getResiBuf (area).copyFrom(saveCS.getResiBuf   (area));
        }
        cs.getRecoBuf   (area).copyFrom(saveCS.getRecoBuf   (area));

        currTU.copyComponentFrom(tmpTU, compID);

        m_CABACEstimator->getCtx() = ctxBest;
      }

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      cs.picture->getPredBuf(area).copyFrom(cs.getPredBuf(area));
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      cs.picture->getRecoBuf(area).copyFrom(cs.getRecoBuf(area));

      cbfs.cbf(compID) = TU::getCbf(currTU, compID);

      cs.dist += singleDistC;
    }
  }
  else
  {
    unsigned    numValidTBlocks   = ::getNumberValidTBlocks( *cs.pcv );
    ChromaCbfs  SplitCbfs         ( false );

    if( partitioner.canSplit( TU_MAX_TR_SPLIT, cs ) )
    {
      partitioner.splitCurrArea( TU_MAX_TR_SPLIT, cs );
    }
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    else if( currTU.cu->ispMode )
    {
      partitioner.splitCurrArea( ispType, cs );
    }
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    else
      THROW( "Implicit TU split not available" );

    do
    {
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      ChromaCbfs subCbfs = xRecurIntraChromaCodingQT( cs, partitioner, bestCostSoFar, ispType );
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      for( uint32_t ch = COMPONENT_Cb; ch < numValidTBlocks; ch++ )
      {
        const ComponentID compID = ComponentID( ch );
        SplitCbfs.cbf( compID ) |= subCbfs.cbf( compID );
      }
    } while( partitioner.nextPart( cs ) );

    partitioner.exitCurrSplit();

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    if( lumaUsesISP && cs.dist == MAX_UINT )
    {
      return cbfs;
    }
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    {

      cbfs.Cb |= SplitCbfs.Cb;
      cbfs.Cr |= SplitCbfs.Cr;

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      if( !lumaUsesISP )
      {
        for( auto &ptu : cs.tus )
        {
          if( currArea.Cb().contains( ptu->Cb() ) || ( !ptu->Cb().valid() && currArea.Y().contains( ptu->Y() ) ) )
          {
            TU::setCbfAtDepth( *ptu, COMPONENT_Cb, currDepth, SplitCbfs.Cb );
            TU::setCbfAtDepth( *ptu, COMPONENT_Cr, currDepth, SplitCbfs.Cr );
          }
        }
      }
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    }
  }

  return cbfs;
}

uint64_t IntraSearch::xFracModeBitsIntra(PredictionUnit &pu, const uint32_t &uiMode, const ChannelType &chType)
{
  uint32_t orgMode = uiMode;

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  if (!pu.mhIntraFlag)
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  std::swap(orgMode, pu.intraDir[chType]);

  m_CABACEstimator->resetBits();

  if( isLuma( chType ) )
  {
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    if ( pu.mhIntraFlag )
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      m_CABACEstimator->MHIntra_luma_pred_modes(*pu.cu);
    else
    {
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      m_CABACEstimator->extend_ref_line(pu);
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      m_CABACEstimator->intra_luma_pred_mode(pu);
    }
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  }
  else
  {
    m_CABACEstimator->intra_chroma_pred_mode( pu );
  }

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  if ( !pu.mhIntraFlag )
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  std::swap(orgMode, pu.intraDir[chType]);

  return m_CABACEstimator->getEstFracBits();
}



void IntraSearch::encPredIntraDPCM( const ComponentID &compID, PelBuf &pOrg, PelBuf &pDst, const uint32_t &uiDirMode )
{
  CHECK( pOrg.buf == 0, "Encoder DPCM called without original buffer" );

  const int srcStride = m_topRefLength + 1;
  CPelBuf   pSrc = CPelBuf(getPredictorPtr(compID), srcStride, m_leftRefLength + 1);

  // Sample Adaptive intra-Prediction (SAP)
  if( uiDirMode == HOR_IDX )
  {
    // left column filled with reference samples, remaining columns filled with pOrg data
    for( int y = 0; y < pDst.height; y++ )
    {
      pDst.at( 0, y ) = pSrc.at( 0, 1 + y );
    }
    CPelBuf orgRest  = pOrg.subBuf( 0, 0, pOrg.width - 1, pOrg.height );
    PelBuf  predRest = pDst.subBuf( 1, 0, pDst.width - 1, pDst.height );

    predRest.copyFrom( orgRest );
  }
  else // VER_IDX
  {
    // top row filled with reference samples, remaining rows filled with pOrg data
    for( int x = 0; x < pDst.width; x++ )
    {
      pDst.at( x, 0 ) = pSrc.at( 1 + x, 0 );
    }
    CPelBuf orgRest  = pOrg.subBuf( 0, 0, pOrg.width, pOrg.height - 1 );
    PelBuf  predRest = pDst.subBuf( 0, 1, pDst.width, pDst.height - 1 );

    predRest.copyFrom( orgRest );
  }
}

bool IntraSearch::useDPCMForFirstPassIntraEstimation( const PredictionUnit &pu, const uint32_t &uiDirMode )
{
  return CU::isRDPCMEnabled( *pu.cu ) && pu.cu->transQuantBypass && (uiDirMode == HOR_IDX || uiDirMode == VER_IDX);
}
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