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HEVC代码追踪（八。一）:estIntraPredQT

2014-11-30 2406
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简介： <p><br></p> <p></p> <pre code_snippet_id="537334" snippet_file_name="blog_20141130_1_4880297" name="code" class="cpp">Void TEncSearch::estIntraPredQT( TComDataCU* pcCU, 


Void 
TEncSearch::estIntraPredQT( TComDataCU* pcCU, 
                           TComYuv*    pcOrgYuv, 
                           TComYuv*    pcPredYuv, 
                           TComYuv*    pcResiYuv, 
                           TComYuv*    pcRecoYuv,
                           UInt&       ruiDistC,
                           Bool        bLumaOnly )
{
  UInt    uiDepth        = pcCU->getDepth(0);
  UInt    uiNumPU        = pcCU->getNumPartitions();
  UInt    uiInitTrDepth  = pcCU->getPartitionSize(0) == SIZE_2Nx2N ? 0 : 1;
  UInt    uiWidth        = pcCU->getWidth (0) >> uiInitTrDepth;
  UInt    uiHeight       = pcCU->getHeight(0) >> uiInitTrDepth;
  UInt    uiQNumParts    = pcCU->getTotalNumPart() >> 2;
  UInt    uiWidthBit     = pcCU->getIntraSizeIdx(0);
  UInt    uiOverallDistY = 0;
  UInt    uiOverallDistC = 0;
  UInt    CandNum;
  Double  CandCostList[ FAST_UDI_MAX_RDMODE_NUM ];
  
  //===== set QP and clear Cbf =====
  if ( pcCU->getSlice()->getPPS()->getUseDQP() == true)
  {
    pcCU->setQPSubParts( pcCU->getQP(0), 0, uiDepth );
  }
  else
  {
    pcCU->setQPSubParts( pcCU->getSlice()->getSliceQp(), 0, uiDepth );
  }
  
  //===== loop over partitions =====
  UInt uiPartOffset = 0;
  for( UInt uiPU = 0; uiPU < uiNumPU; uiPU++, uiPartOffset += uiQNumParts )
  {
    //===== init pattern for luma prediction =====
    Bool bAboveAvail = false;
    Bool bLeftAvail  = false;
    pcCU->getPattern()->initPattern   ( pcCU, uiInitTrDepth, uiPartOffset );
    pcCU->getPattern()->initAdiPattern( pcCU, uiPartOffset, uiInitTrDepth, m_piYuvExt, m_iYuvExtStride, m_iYuvExtHeight, bAboveAvail, bLeftAvail );
    
    //===== determine set of modes to be tested (using prediction signal only) =====
    Int numModesAvailable     = 35; //total number of Intra modes
    Pel* piOrg         = pcOrgYuv ->getLumaAddr( uiPU, uiWidth );
    Pel* piPred        = pcPredYuv->getLumaAddr( uiPU, uiWidth );
    UInt uiStride      = pcPredYuv->getStride();
    UInt uiRdModeList[FAST_UDI_MAX_RDMODE_NUM];
    Int numModesForFullRD = g_aucIntraModeNumFast[ uiWidthBit ];
    
    Bool doFastSearch = (numModesForFullRD != numModesAvailable);
    if (doFastSearch)
    {
      assert(numModesForFullRD < numModesAvailable);

      for( Int i=0; i < numModesForFullRD; i++ ) 
      {
        CandCostList[ i ] = MAX_DOUBLE;
      }
      CandNum = 0;
      
      for( Int modeIdx = 0; modeIdx < numModesAvailable; modeIdx++ )
      {
        UInt uiMode = modeIdx;

        predIntraLumaAng( pcCU->getPattern(), uiMode, piPred, uiStride, uiWidth, uiHeight, bAboveAvail, bLeftAvail );
        
        // use hadamard transform here
        UInt uiSad = m_pcRdCost->calcHAD(g_bitDepthY, piOrg, uiStride, piPred, uiStride, uiWidth, uiHeight );
        
        UInt   iModeBits = xModeBitsIntra( pcCU, uiMode, uiPU, uiPartOffset, uiDepth, uiInitTrDepth );
        Double cost      = (Double)uiSad + (Double)iModeBits * m_pcRdCost->getSqrtLambda();
        
        CandNum += xUpdateCandList( uiMode, cost, numModesForFullRD, uiRdModeList, CandCostList );
      }
    
#if FAST_UDI_USE_MPM
      Int uiPreds[3] = {-1, -1, -1};
      Int iMode = -1;
      Int numCand = pcCU->getIntraDirLumaPredictor( uiPartOffset, uiPreds, &iMode );
      if( iMode >= 0 )
      {
        numCand = iMode;
      }
      
      for( Int j=0; j < numCand; j++)
      {
        Bool mostProbableModeIncluded = false;
        Int mostProbableMode = uiPreds[j];
        
        for( Int i=0; i < numModesForFullRD; i++)
        {
          mostProbableModeIncluded |= (mostProbableMode == uiRdModeList[i]);
        }
        if (!mostProbableModeIncluded)
        {
          uiRdModeList[numModesForFullRD++] = mostProbableMode;
        }
      }
#endif // FAST_UDI_USE_MPM
    }
    else
    {
      for( Int i=0; i < numModesForFullRD; i++)
      {
        uiRdModeList[i] = i;
      }
    }
    
    //===== check modes (using r-d costs) =====
#if HHI_RQT_INTRA_SPEEDUP_MOD
    UInt   uiSecondBestMode  = MAX_UINT;
    Double dSecondBestPUCost = MAX_DOUBLE;
#endif
    
    UInt    uiBestPUMode  = 0;
    UInt    uiBestPUDistY = 0;
    UInt    uiBestPUDistC = 0;
    Double  dBestPUCost   = MAX_DOUBLE;
    for( UInt uiMode = 0; uiMode < numModesForFullRD; uiMode++ )
    {
      // set luma prediction mode
      UInt uiOrgMode = uiRdModeList[uiMode];
      
      pcCU->setLumaIntraDirSubParts ( uiOrgMode, uiPartOffset, uiDepth + uiInitTrDepth );
      
      // set context models
      m_pcRDGoOnSbacCoder->load( m_pppcRDSbacCoder[uiDepth][CI_CURR_BEST] );
      
      // determine residual for partition
      UInt   uiPUDistY = 0;
      UInt   uiPUDistC = 0;
      Double dPUCost   = 0.0;
#if HHI_RQT_INTRA_SPEEDUP
      xRecurIntraCodingQT( pcCU, uiInitTrDepth, uiPartOffset, bLumaOnly, pcOrgYuv, pcPredYuv, pcResiYuv, uiPUDistY, uiPUDistC, true, dPUCost );
#else
      xRecurIntraCodingQT( pcCU, uiInitTrDepth, uiPartOffset, bLumaOnly, pcOrgYuv, pcPredYuv, pcResiYuv, uiPUDistY, uiPUDistC, dPUCost );
#endif
      
      // check r-d cost
      if( dPUCost < dBestPUCost )
      {
#if HHI_RQT_INTRA_SPEEDUP_MOD
        uiSecondBestMode  = uiBestPUMode;
        dSecondBestPUCost = dBestPUCost;
#endif
        uiBestPUMode  = uiOrgMode;
        uiBestPUDistY = uiPUDistY;
        uiBestPUDistC = uiPUDistC;
        dBestPUCost   = dPUCost;
        
        xSetIntraResultQT( pcCU, uiInitTrDepth, uiPartOffset, bLumaOnly, pcRecoYuv );
        
        UInt uiQPartNum = pcCU->getPic()->getNumPartInCU() >> ( ( pcCU->getDepth(0) + uiInitTrDepth ) << 1 );
        ::memcpy( m_puhQTTempTrIdx,  pcCU->getTransformIdx()       + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempCbf[0], pcCU->getCbf( TEXT_LUMA     ) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempCbf[1], pcCU->getCbf( TEXT_CHROMA_U ) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempCbf[2], pcCU->getCbf( TEXT_CHROMA_V ) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempTransformSkipFlag[0], pcCU->getTransformSkip(TEXT_LUMA)     + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempTransformSkipFlag[1], pcCU->getTransformSkip(TEXT_CHROMA_U) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempTransformSkipFlag[2], pcCU->getTransformSkip(TEXT_CHROMA_V) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
      }
#if HHI_RQT_INTRA_SPEEDUP_MOD
      else if( dPUCost < dSecondBestPUCost )
      {
        uiSecondBestMode  = uiOrgMode;
        dSecondBestPUCost = dPUCost;
      }
#endif
    } // Mode loop
    
#if HHI_RQT_INTRA_SPEEDUP
#if HHI_RQT_INTRA_SPEEDUP_MOD
    for( UInt ui =0; ui < 2; ++ui )
#endif
    {
#if HHI_RQT_INTRA_SPEEDUP_MOD
      UInt uiOrgMode   = ui ? uiSecondBestMode  : uiBestPUMode;
      if( uiOrgMode == MAX_UINT )
      {
        break;
      }
#else
      UInt uiOrgMode = uiBestPUMode;
#endif
      
      pcCU->setLumaIntraDirSubParts ( uiOrgMode, uiPartOffset, uiDepth + uiInitTrDepth );
      
      // set context models
      m_pcRDGoOnSbacCoder->load( m_pppcRDSbacCoder[uiDepth][CI_CURR_BEST] );
      
      // determine residual for partition
      UInt   uiPUDistY = 0;
      UInt   uiPUDistC = 0;
      Double dPUCost   = 0.0;
      xRecurIntraCodingQT( pcCU, uiInitTrDepth, uiPartOffset, bLumaOnly, pcOrgYuv, pcPredYuv, pcResiYuv, uiPUDistY, uiPUDistC, false, dPUCost );
      
      // check r-d cost
      if( dPUCost < dBestPUCost )
      {
        uiBestPUMode  = uiOrgMode;
        uiBestPUDistY = uiPUDistY;
        uiBestPUDistC = uiPUDistC;
        dBestPUCost   = dPUCost;
        
        xSetIntraResultQT( pcCU, uiInitTrDepth, uiPartOffset, bLumaOnly, pcRecoYuv );
        
        UInt uiQPartNum = pcCU->getPic()->getNumPartInCU() >> ( ( pcCU->getDepth(0) + uiInitTrDepth ) << 1 );
        ::memcpy( m_puhQTTempTrIdx,  pcCU->getTransformIdx()       + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempCbf[0], pcCU->getCbf( TEXT_LUMA     ) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempCbf[1], pcCU->getCbf( TEXT_CHROMA_U ) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempCbf[2], pcCU->getCbf( TEXT_CHROMA_V ) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempTransformSkipFlag[0], pcCU->getTransformSkip(TEXT_LUMA)     + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempTransformSkipFlag[1], pcCU->getTransformSkip(TEXT_CHROMA_U) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
        ::memcpy( m_puhQTTempTransformSkipFlag[2], pcCU->getTransformSkip(TEXT_CHROMA_V) + uiPartOffset, uiQPartNum * sizeof( UChar ) );
      }
    } // Mode loop
#endif
    
    //--- update overall distortion ---
    uiOverallDistY += uiBestPUDistY;
    uiOverallDistC += uiBestPUDistC;
    
    //--- update transform index and cbf ---
    UInt uiQPartNum = pcCU->getPic()->getNumPartInCU() >> ( ( pcCU->getDepth(0) + uiInitTrDepth ) << 1 );
    ::memcpy( pcCU->getTransformIdx()       + uiPartOffset, m_puhQTTempTrIdx,  uiQPartNum * sizeof( UChar ) );
    ::memcpy( pcCU->getCbf( TEXT_LUMA     ) + uiPartOffset, m_puhQTTempCbf[0], uiQPartNum * sizeof( UChar ) );
    ::memcpy( pcCU->getCbf( TEXT_CHROMA_U ) + uiPartOffset, m_puhQTTempCbf[1], uiQPartNum * sizeof( UChar ) );
    ::memcpy( pcCU->getCbf( TEXT_CHROMA_V ) + uiPartOffset, m_puhQTTempCbf[2], uiQPartNum * sizeof( UChar ) );
    ::memcpy( pcCU->getTransformSkip(TEXT_LUMA)     + uiPartOffset, m_puhQTTempTransformSkipFlag[0], uiQPartNum * sizeof( UChar ) );
    ::memcpy( pcCU->getTransformSkip(TEXT_CHROMA_U) + uiPartOffset, m_puhQTTempTransformSkipFlag[1], uiQPartNum * sizeof( UChar ) );
    ::memcpy( pcCU->getTransformSkip(TEXT_CHROMA_V) + uiPartOffset, m_puhQTTempTransformSkipFlag[2], uiQPartNum * sizeof( UChar ) );
    //--- set reconstruction for next intra prediction blocks ---
    if( uiPU != uiNumPU - 1 )
    {
      Bool bSkipChroma  = false;
      Bool bChromaSame  = false;
      UInt uiLog2TrSize = g_aucConvertToBit[ pcCU->getSlice()->getSPS()->getMaxCUWidth() >> ( pcCU->getDepth(0) + uiInitTrDepth ) ] + 2;
      if( !bLumaOnly && uiLog2TrSize == 2 )
      {
        assert( uiInitTrDepth  > 0 );
        bSkipChroma  = ( uiPU != 0 );
        bChromaSame  = true;
      }
      
      UInt    uiCompWidth   = pcCU->getWidth ( 0 ) >> uiInitTrDepth;
      UInt    uiCompHeight  = pcCU->getHeight( 0 ) >> uiInitTrDepth;
      UInt    uiZOrder      = pcCU->getZorderIdxInCU() + uiPartOffset;
      Pel*    piDes         = pcCU->getPic()->getPicYuvRec()->getLumaAddr( pcCU->getAddr(), uiZOrder );
      UInt    uiDesStride   = pcCU->getPic()->getPicYuvRec()->getStride();
      Pel*    piSrc         = pcRecoYuv->getLumaAddr( uiPartOffset );
      UInt    uiSrcStride   = pcRecoYuv->getStride();
      for( UInt uiY = 0; uiY < uiCompHeight; uiY++, piSrc += uiSrcStride, piDes += uiDesStride )
      {
        for( UInt uiX = 0; uiX < uiCompWidth; uiX++ )
        {
          piDes[ uiX ] = piSrc[ uiX ];
        }
      }
      if( !bLumaOnly && !bSkipChroma )
      {
        if( !bChromaSame )
        {
          uiCompWidth   >>= 1;
          uiCompHeight  >>= 1;
        }
        piDes         = pcCU->getPic()->getPicYuvRec()->getCbAddr( pcCU->getAddr(), uiZOrder );
        uiDesStride   = pcCU->getPic()->getPicYuvRec()->getCStride();
        piSrc         = pcRecoYuv->getCbAddr( uiPartOffset );
        uiSrcStride   = pcRecoYuv->getCStride();
        for( UInt uiY = 0; uiY < uiCompHeight; uiY++, piSrc += uiSrcStride, piDes += uiDesStride )
        {
          for( UInt uiX = 0; uiX < uiCompWidth; uiX++ )
          {
            piDes[ uiX ] = piSrc[ uiX ];
          }
        }
        piDes         = pcCU->getPic()->getPicYuvRec()->getCrAddr( pcCU->getAddr(), uiZOrder );
        piSrc         = pcRecoYuv->getCrAddr( uiPartOffset );
        for( UInt uiY = 0; uiY < uiCompHeight; uiY++, piSrc += uiSrcStride, piDes += uiDesStride )
        {
          for( UInt uiX = 0; uiX < uiCompWidth; uiX++ )
          {
            piDes[ uiX ] = piSrc[ uiX ];
          }
        }
      }
    }
    
    //=== update PU data ====
    pcCU->setLumaIntraDirSubParts     ( uiBestPUMode, uiPartOffset, uiDepth + uiInitTrDepth );
    pcCU->copyToPic                   ( uiDepth, uiPU, uiInitTrDepth );
  } // PU loop
  
  
  if( uiNumPU > 1 )
  { // set Cbf for all blocks
    UInt uiCombCbfY = 0;
    UInt uiCombCbfU = 0;
    UInt uiCombCbfV = 0;
    UInt uiPartIdx  = 0;
    for( UInt uiPart = 0; uiPart < 4; uiPart++, uiPartIdx += uiQNumParts )
    {
      uiCombCbfY |= pcCU->getCbf( uiPartIdx, TEXT_LUMA,     1 );
      uiCombCbfU |= pcCU->getCbf( uiPartIdx, TEXT_CHROMA_U, 1 );
      uiCombCbfV |= pcCU->getCbf( uiPartIdx, TEXT_CHROMA_V, 1 );
    }
    for( UInt uiOffs = 0; uiOffs < 4 * uiQNumParts; uiOffs++ )
    {
      pcCU->getCbf( TEXT_LUMA     )[ uiOffs ] |= uiCombCbfY;
      pcCU->getCbf( TEXT_CHROMA_U )[ uiOffs ] |= uiCombCbfU;
      pcCU->getCbf( TEXT_CHROMA_V )[ uiOffs ] |= uiCombCbfV;
    }
  }
  
  //===== reset context models =====
  m_pcRDGoOnSbacCoder->load(m_pppcRDSbacCoder[uiDepth][CI_CURR_BEST]);
  
  //===== set distortion (rate and r-d costs are determined later) =====
  ruiDistC                   = uiOverallDistC;
  pcCU->getTotalDistortion() = uiOverallDistY + uiOverallDistC;
}


Void TComPrediction::predIntraLumaAng(TComPattern* pcTComPattern, UInt uiDirMode, Pel* piPred, UInt uiStride, Int iWidth, Int iHeight, Bool bAbove, Bool bLeft )
{
  Pel *pDst = piPred;
  Int *ptrSrc;

  assert( g_aucConvertToBit[ iWidth ] >= 0 ); //   4x  4
  assert( g_aucConvertToBit[ iWidth ] <= 5 ); // 128x128
  assert( iWidth == iHeight  );

  ptrSrc = pcTComPattern->getPredictorPtr( uiDirMode, g_aucConvertToBit[ iWidth ] + 2, m_piYuvExt );

  // get starting pixel in block
  Int sw = 2 * iWidth + 1;

  // Create the prediction
  if ( uiDirMode == PLANAR_IDX )
  {
    xPredIntraPlanar( ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight );
  }
  else
  {
    if ( (iWidth > 16) || (iHeight > 16) )
    {
      xPredIntraAng(g_bitDepthY, ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight, uiDirMode, bAbove, bLeft, false );
    }
    else
    {
      xPredIntraAng(g_bitDepthY, ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight, uiDirMode, bAbove, bLeft, true );

      if( (uiDirMode == DC_IDX ) && bAbove && bLeft )
      {
        xDCPredFiltering( ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight);
      }
    }
  }
}


UInt TComRdCost::calcHAD(Int bitDepth, Pel* pi0, Int iStride0, Pel* pi1, Int iStride1, Int iWidth, Int iHeight )
{
  UInt uiSum = 0;
  Int x, y;
  
  if ( ( (iWidth % 8) == 0 ) && ( (iHeight % 8) == 0 ) )
  {
    for ( y=0; y<iHeight; y+= 8 )
    {
      for ( x=0; x<iWidth; x+= 8 )
      {
        uiSum += xCalcHADs8x8( &pi0[x], &pi1[x], iStride0, iStride1, 1 );
      }
      pi0 += iStride0*8;
      pi1 += iStride1*8;
    }
  }
  else
  {
    assert(iWidth % 4 == 0 && iHeight % 4 == 0);
    
    for ( y=0; y<iHeight; y+= 4 )
    {
      for ( x=0; x<iWidth; x+= 4 )
      {
        uiSum += xCalcHADs4x4( &pi0[x], &pi1[x], iStride0, iStride1, 1 );
      }
      pi0 += iStride0*4;
      pi1 += iStride1*4;
    }
  }
  
  return uiSum >> DISTORTION_PRECISION_ADJUSTMENT(bitDepth-8);

}


UInt TEncSearch::xModeBitsIntra( TComDataCU* pcCU, UInt uiMode, UInt uiPU, UInt uiPartOffset, UInt uiDepth, UInt uiInitTrDepth )
{
  // Reload only contexts required for coding intra mode information
  m_pcRDGoOnSbacCoder->loadIntraDirModeLuma( m_pppcRDSbacCoder[uiDepth][CI_CURR_BEST] );
  
  pcCU->setLumaIntraDirSubParts ( uiMode, uiPartOffset, uiDepth + uiInitTrDepth );
  
  m_pcEntropyCoder->resetBits();
  m_pcEntropyCoder->encodeIntraDirModeLuma ( pcCU, uiPartOffset);
  
  return m_pcEntropyCoder->getNumberOfWrittenBits();
}


UInt TEncSearch::xUpdateCandList( UInt uiMode, Double uiCost, UInt uiFastCandNum, UInt * CandModeList, Double * CandCostList )
{
  UInt i;
  UInt shift=0;
  
  while ( shift<uiFastCandNum && uiCost<CandCostList[ uiFastCandNum-1-shift ] ) shift++;
  
  if( shift!=0 )
  {
    for(i=1; i<shift; i++)
    {
      CandModeList[ uiFastCandNum-i ] = CandModeList[ uiFastCandNum-1-i ];
      CandCostList[ uiFastCandNum-i ] = CandCostList[ uiFastCandNum-1-i ];
    }
    CandModeList[ uiFastCandNum-shift ] = uiMode;
    CandCostList[ uiFastCandNum-shift ] = uiCost;
    return 1;
  }
  
  return 0;
}


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<p>xTZSearch调用了2个最为主要的函数：xTZ8PointDiamondSearch和xTZ2PointSearch，值得一提的是，HM中还提供了另外一个搜索函数xTZ8PointSquareSearch，但由于实际并没有使用这个函数，且它其实跟钻石搜索只是搜索点的选择略有不同，分析起来基本上也是一样的。</p> <p><br></p> <p></p> <pre code_s
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<p><br></p> <p></p> <pre code_snippet_id="539588" snippet_file_name="blog_20141202_1_7201235" name="code" class="cpp">__inline Void TEncSearch::xTZ8PointSquareSearch( TComPattern* pcPatternKey,
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