compressSlice函数代码跟踪

西巴，上篇随便对付了一下关于GOP的函数，那接下来当然是对付Slice函数啦！

Void TEncSlice::compressSlice( TComPic* pcPic, const Bool bCompressEntireSlice, const Bool bFastDeltaQP )
{// if bCompressEntireSlice is true, then the entire slice (not slice segment) is compressed,//   effectively disabling the slice-segment-mode.UInt   startCtuTsAddr;UInt   boundingCtuTsAddr;TComSlice* const pcSlice            = pcPic->getSlice(getSliceIdx());pcSlice->setSliceSegmentBits(0);xDetermineStartAndBoundingCtuTsAddr ( startCtuTsAddr, boundingCtuTsAddr, pcPic );if (bCompressEntireSlice){boundingCtuTsAddr = pcSlice->getSliceCurEndCtuTsAddr();pcSlice->setSliceSegmentCurEndCtuTsAddr(boundingCtuTsAddr);}// initialize cost values - these are used by precompressSlice (they should be parameters).m_uiPicTotalBits  = 0;m_dPicRdCost      = 0; // NOTE: This is a write-only variable!m_uiPicDist       = 0;m_pcEntropyCoder->setEntropyCoder   ( m_pppcRDSbacCoder[0][CI_CURR_BEST] );m_pcEntropyCoder->resetEntropy      ( pcSlice );TEncBinCABAC* pRDSbacCoder = (TEncBinCABAC *) m_pppcRDSbacCoder[0][CI_CURR_BEST]->getEncBinIf();pRDSbacCoder->setBinCountingEnableFlag( false );pRDSbacCoder->setBinsCoded( 0 );TComBitCounter  tempBitCounter;const UInt      frameWidthInCtus = pcPic->getPicSym()->getFrameWidthInCtus();m_pcCuEncoder->setFastDeltaQp(bFastDeltaQP);//------------------------------------------------------------------------------//  Weighted Prediction parameters estimation.//------------------------------------------------------------------------------// calculate AC/DC values for current pictureif( pcSlice->getPPS()->getUseWP() || pcSlice->getPPS()->getWPBiPred() ){xCalcACDCParamSlice(pcSlice);}const Bool bWp_explicit = (pcSlice->getSliceType()==P_SLICE && pcSlice->getPPS()->getUseWP()) || (pcSlice->getSliceType()==B_SLICE && pcSlice->getPPS()->getWPBiPred());if ( bWp_explicit ){//------------------------------------------------------------------------------//  Weighted Prediction implemented at Slice level. SliceMode=2 is not supported yet.//------------------------------------------------------------------------------if ( pcSlice->getSliceMode()==FIXED_NUMBER_OF_BYTES || pcSlice->getSliceSegmentMode()==FIXED_NUMBER_OF_BYTES ){printf("Weighted Prediction is not supported with slice mode determined by max number of bins.\n"); exit(0);}xEstimateWPParamSlice( pcSlice );pcSlice->initWpScaling(pcSlice->getSPS());// check WP on/offxCheckWPEnable( pcSlice );}#if ADAPTIVE_QP_SELECTIONif( m_pcCfg->getUseAdaptQpSelect() && !(pcSlice->getDependentSliceSegmentFlag())){// TODO: this won't work with dependent slices: they do not have their own QP. Check fix to mask clause execution with && !(pcSlice->getDependentSliceSegmentFlag())m_pcTrQuant->clearSliceARLCnt(); // TODO: this looks wrong for multiple slices - the results of all but the last slice will be cleared before they are used (all slices compressed, and then all slices encoded)if(pcSlice->getSliceType()!=I_SLICE){Int qpBase = pcSlice->getSliceQpBase();pcSlice->setSliceQp(qpBase + m_pcTrQuant->getQpDelta(qpBase));}}
#endif// Adjust initial state if this is the start of a dependent slice.{const UInt      ctuRsAddr               = pcPic->getPicSym()->getCtuTsToRsAddrMap( startCtuTsAddr);const UInt      currentTileIdx          = pcPic->getPicSym()->getTileIdxMap(ctuRsAddr);const TComTile *pCurrentTile            = pcPic->getPicSym()->getTComTile(currentTileIdx);const UInt      firstCtuRsAddrOfTile    = pCurrentTile->getFirstCtuRsAddr();if( pcSlice->getDependentSliceSegmentFlag() && ctuRsAddr != firstCtuRsAddrOfTile ){// This will only occur if dependent slice-segments (m_entropyCodingSyncContextState=true) are being used.if( pCurrentTile->getTileWidthInCtus() >= 2 || !m_pcCfg->getWaveFrontsynchro() ){m_pppcRDSbacCoder[0][CI_CURR_BEST]->loadContexts( &m_lastSliceSegmentEndContextState );}}}// for every CTU in the slice segment (may terminate sooner if there is a byte limit on the slice-segment)for( UInt ctuTsAddr = startCtuTsAddr; ctuTsAddr < boundingCtuTsAddr; ++ctuTsAddr ){const UInt ctuRsAddr = pcPic->getPicSym()->getCtuTsToRsAddrMap(ctuTsAddr);// initialize CTU encoderTComDataCU* pCtu = pcPic->getCtu( ctuRsAddr );pCtu->initCtu( pcPic, ctuRsAddr );// update CABAC stateconst UInt firstCtuRsAddrOfTile = pcPic->getPicSym()->getTComTile(pcPic->getPicSym()->getTileIdxMap(ctuRsAddr))->getFirstCtuRsAddr();const UInt tileXPosInCtus = firstCtuRsAddrOfTile % frameWidthInCtus;const UInt ctuXPosInCtus  = ctuRsAddr % frameWidthInCtus;if (ctuRsAddr == firstCtuRsAddrOfTile){m_pppcRDSbacCoder[0][CI_CURR_BEST]->resetEntropy(pcSlice);}else if ( ctuXPosInCtus == tileXPosInCtus && m_pcCfg->getWaveFrontsynchro()){// reset and then update contexts to the state at the end of the top-right CTU (if within current slice and tile).m_pppcRDSbacCoder[0][CI_CURR_BEST]->resetEntropy(pcSlice);// Sync if the Top-Right is available.TComDataCU *pCtuUp = pCtu->getCtuAbove();if ( pCtuUp && ((ctuRsAddr%frameWidthInCtus+1) < frameWidthInCtus)  ){TComDataCU *pCtuTR = pcPic->getCtu( ctuRsAddr - frameWidthInCtus + 1 );if ( pCtu->CUIsFromSameSliceAndTile(pCtuTR) ){// Top-Right is available, we use it.m_pppcRDSbacCoder[0][CI_CURR_BEST]->loadContexts( &m_entropyCodingSyncContextState );}}}// set go-on entropy coder (used for all trial encodings - the cu encoder and encoder search also have a copy of the same pointer)m_pcEntropyCoder->setEntropyCoder ( m_pcRDGoOnSbacCoder );m_pcEntropyCoder->setBitstream( &tempBitCounter );tempBitCounter.resetBits();m_pcRDGoOnSbacCoder->load( m_pppcRDSbacCoder[0][CI_CURR_BEST] ); // this copy is not strictly necessary here, but indicates that the GoOnSbacCoder// is reset to a known state before every decision process.((TEncBinCABAC*)m_pcRDGoOnSbacCoder->getEncBinIf())->setBinCountingEnableFlag(true);Double oldLambda = m_pcRdCost->getLambda();if ( m_pcCfg->getUseRateCtrl() ){Int estQP        = pcSlice->getSliceQp();Double estLambda = -1.0;Double bpp       = -1.0;if ( ( pcPic->getSlice( 0 )->getSliceType() == I_SLICE && m_pcCfg->getForceIntraQP() ) || !m_pcCfg->getLCULevelRC() ){estQP = pcSlice->getSliceQp();}else{bpp = m_pcRateCtrl->getRCPic()->getLCUTargetBpp(pcSlice->getSliceType());if ( pcPic->getSlice( 0 )->getSliceType() == I_SLICE){estLambda = m_pcRateCtrl->getRCPic()->getLCUEstLambdaAndQP(bpp, pcSlice->getSliceQp(), &estQP);}else{estLambda = m_pcRateCtrl->getRCPic()->getLCUEstLambda( bpp );estQP     = m_pcRateCtrl->getRCPic()->getLCUEstQP    ( estLambda, pcSlice->getSliceQp() );}estQP     = Clip3( -pcSlice->getSPS()->getQpBDOffset(CHANNEL_TYPE_LUMA), MAX_QP, estQP );m_pcRdCost->setLambda(estLambda, pcSlice->getSPS()->getBitDepths());#if RDOQ_CHROMA_LAMBDA// set lambda for RDOQconst Double chromaLambda = estLambda / m_pcRdCost->getChromaWeight();const Double lambdaArray[MAX_NUM_COMPONENT] = { estLambda, chromaLambda, chromaLambda };m_pcTrQuant->setLambdas( lambdaArray );
#elsem_pcTrQuant->setLambda( estLambda );
#endif}m_pcRateCtrl->setRCQP( estQP );
#if ADAPTIVE_QP_SELECTIONpCtu->getSlice()->setSliceQpBase( estQP );
#endif}// run CTU trial encoderm_pcCuEncoder->compressCtu( pCtu );// All CTU decisions have now been made. Restore entropy coder to an initial stage, ready to make a true encode,// which will result in the state of the contexts being correct. It will also count up the number of bits coded,// which is used if there is a limit of the number of bytes per slice-segment.m_pcEntropyCoder->setEntropyCoder ( m_pppcRDSbacCoder[0][CI_CURR_BEST] );m_pcEntropyCoder->setBitstream( &tempBitCounter );pRDSbacCoder->setBinCountingEnableFlag( true );m_pppcRDSbacCoder[0][CI_CURR_BEST]->resetBits();pRDSbacCoder->setBinsCoded( 0 );// encode CTU and calculate the true bit counters.m_pcCuEncoder->encodeCtu( pCtu );pRDSbacCoder->setBinCountingEnableFlag( false );const Int numberOfWrittenBits = m_pcEntropyCoder->getNumberOfWrittenBits();// Calculate if this CTU puts us over slice bit size.// cannot terminate if current slice/slice-segment would be 0 Ctu in size,const UInt validEndOfSliceCtuTsAddr = ctuTsAddr + (ctuTsAddr == startCtuTsAddr ? 1 : 0);// Set slice end parameterif(pcSlice->getSliceMode()==FIXED_NUMBER_OF_BYTES && pcSlice->getSliceBits()+numberOfWrittenBits > (pcSlice->getSliceArgument()<<3)){pcSlice->setSliceSegmentCurEndCtuTsAddr(validEndOfSliceCtuTsAddr);pcSlice->setSliceCurEndCtuTsAddr(validEndOfSliceCtuTsAddr);boundingCtuTsAddr=validEndOfSliceCtuTsAddr;}else if((!bCompressEntireSlice) && pcSlice->getSliceSegmentMode()==FIXED_NUMBER_OF_BYTES && pcSlice->getSliceSegmentBits()+numberOfWrittenBits > (pcSlice->getSliceSegmentArgument()<<3)){pcSlice->setSliceSegmentCurEndCtuTsAddr(validEndOfSliceCtuTsAddr);boundingCtuTsAddr=validEndOfSliceCtuTsAddr;}if (boundingCtuTsAddr <= ctuTsAddr){break;}pcSlice->setSliceBits( (UInt)(pcSlice->getSliceBits() + numberOfWrittenBits) );pcSlice->setSliceSegmentBits(pcSlice->getSliceSegmentBits()+numberOfWrittenBits);// Store probabilities of second CTU in line into buffer - used only if wavefront-parallel-processing is enabled.if ( ctuXPosInCtus == tileXPosInCtus+1 && m_pcCfg->getWaveFrontsynchro()){m_entropyCodingSyncContextState.loadContexts(m_pppcRDSbacCoder[0][CI_CURR_BEST]);}if ( m_pcCfg->getUseRateCtrl() ){Int actualQP        = g_RCInvalidQPValue;Double actualLambda = m_pcRdCost->getLambda();Int actualBits      = pCtu->getTotalBits();Int numberOfEffectivePixels    = 0;for ( Int idx = 0; idx < pcPic->getNumPartitionsInCtu(); idx++ ){if ( pCtu->getPredictionMode( idx ) != NUMBER_OF_PREDICTION_MODES && ( !pCtu->isSkipped( idx ) ) ){numberOfEffectivePixels = numberOfEffectivePixels + 16;break;}}if ( numberOfEffectivePixels == 0 ){actualQP = g_RCInvalidQPValue;}else{actualQP = pCtu->getQP( 0 );}m_pcRdCost->setLambda(oldLambda, pcSlice->getSPS()->getBitDepths());m_pcRateCtrl->getRCPic()->updateAfterCTU( m_pcRateCtrl->getRCPic()->getLCUCoded(), actualBits, actualQP, actualLambda,pCtu->getSlice()->getSliceType() == I_SLICE ? 0 : m_pcCfg->getLCULevelRC() );}m_uiPicTotalBits += pCtu->getTotalBits();m_dPicRdCost     += pCtu->getTotalCost();m_uiPicDist      += pCtu->getTotalDistortion();}// store context state at the end of this slice-segment, in case the next slice is a dependent slice and continues using the CABAC contexts.if( pcSlice->getPPS()->getDependentSliceSegmentsEnabledFlag() ){m_lastSliceSegmentEndContextState.loadContexts( m_pppcRDSbacCoder[0][CI_CURR_BEST] );//ctx end of dep.slice}// stop use of temporary bit counter object.m_pppcRDSbacCoder[0][CI_CURR_BEST]->setBitstream(NULL);m_pcRDGoOnSbacCoder->setBitstream(NULL); // stop use of tempBitCounter.// TODO: optimise cabac_init during compress slice to improve multi-slice operation//if (pcSlice->getPPS()->getCabacInitPresentFlag() && !pcSlice->getPPS()->getDependentSliceSegmentsEnabledFlag())//{//  m_encCABACTableIdx = m_pcEntropyCoder->determineCabacInitIdx();//}//else//{//  m_encCABACTableIdx = pcSlice->getSliceType();//}
}

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