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/** \file     TDecSlice.cpp
    \brief    slice decoder class
*/

#include "TDecSlice.h"

//! \ingroup TLibDecoder
//! \{

#if SVC_EXTENSION
ParameterSetMap<TComVPS> ParameterSetManagerDecoder::m_vpsBuffer(MAX_NUM_VPS);
ParameterSetMap<TComSPS> ParameterSetManagerDecoder::m_spsBuffer(MAX_NUM_SPS);
ParameterSetMap<TComPPS> ParameterSetManagerDecoder::m_ppsBuffer(MAX_NUM_PPS);
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

TDecSlice::TDecSlice()
{
}

TDecSlice::~TDecSlice()
{
}

Void TDecSlice::create()
{
}

Void TDecSlice::destroy()
{
}

#if SVC_EXTENSION
Void TDecSlice::init(TDecEntropy* pcEntropyDecoder, TDecCu* pcCuDecoder, UInt* saoMaxOffsetQVal)
{
  m_pcEntropyDecoder  = pcEntropyDecoder;
  m_pcCuDecoder       = pcCuDecoder;
  m_saoMaxOffsetQVal  = saoMaxOffsetQVal;
}
#else
Void TDecSlice::init(TDecEntropy* pcEntropyDecoder, TDecCu* pcCuDecoder)
{
  m_pcEntropyDecoder  = pcEntropyDecoder;
  m_pcCuDecoder       = pcCuDecoder;
}
#endif

Void TDecSlice::decompressSlice(TComInputBitstream** ppcSubstreams, TComPic* pcPic, TDecSbac* pcSbacDecoder)
{
  TComSlice* pcSlice                 = pcPic->getSlice(pcPic->getCurrSliceIdx());

  const Int  startCtuTsAddr          = pcSlice->getSliceSegmentCurStartCtuTsAddr();
  const Int  startCtuRsAddr          = pcPic->getPicSym()->getCtuTsToRsAddrMap(startCtuTsAddr);
  const UInt numCtusInFrame          = pcPic->getNumberOfCtusInFrame();

  const UInt frameWidthInCtus        = pcPic->getPicSym()->getFrameWidthInCtus();
  const Bool depSliceSegmentsEnabled = pcSlice->getPPS()->getDependentSliceSegmentsEnabledFlag();
  const Bool wavefrontsEnabled       = pcSlice->getPPS()->getEntropyCodingSyncEnabledFlag();

  m_pcEntropyDecoder->setEntropyDecoder ( pcSbacDecoder  );
  m_pcEntropyDecoder->setBitstream      ( ppcSubstreams[0] );
  m_pcEntropyDecoder->resetEntropy      (pcSlice);

  // decoder doesn't need prediction & residual frame buffer
  pcPic->setPicYuvPred( 0 );
  pcPic->setPicYuvResi( 0 );

#if ENC_DEC_TRACE
  g_bJustDoIt = g_bEncDecTraceEnable;
#endif
  DTRACE_CABAC_VL( g_nSymbolCounter++ );
  DTRACE_CABAC_T( "\tPOC: " );
  DTRACE_CABAC_V( pcPic->getPOC() );
  DTRACE_CABAC_T( "\n" );

#if ENC_DEC_TRACE
  g_bJustDoIt = g_bEncDecTraceDisable;
#endif

  // The first CTU of the slice is the first coded substream, but the global substream number, as calculated by getSubstreamForCtuAddr may be higher.
  // This calculates the common offset for all substreams in this slice.
  const UInt subStreamOffset=pcPic->getSubstreamForCtuAddr(startCtuRsAddr, true, pcSlice);


  if (depSliceSegmentsEnabled)
  {
    // modify initial contexts with previous slice segment if this is a dependent slice.
    const UInt startTileIdx=pcPic->getPicSym()->getTileIdxMap(startCtuRsAddr);
    const TComTile *pCurrentTile=pcPic->getPicSym()->getTComTile(startTileIdx);
    const UInt firstCtuRsAddrOfTile = pCurrentTile->getFirstCtuRsAddr();

    if( pcSlice->getDependentSliceSegmentFlag() && startCtuRsAddr != firstCtuRsAddrOfTile)
    {
      if ( pCurrentTile->getTileWidthInCtus() >= 2 || !wavefrontsEnabled)
      {
        pcSbacDecoder->loadContexts(&m_lastSliceSegmentEndContextState);
      }
    }
  }

  // for every CTU in the slice segment...

  Bool isLastCtuOfSliceSegment = false;
  for( UInt ctuTsAddr = startCtuTsAddr; !isLastCtuOfSliceSegment && ctuTsAddr < numCtusInFrame; ctuTsAddr++)
  {
    const UInt ctuRsAddr = pcPic->getPicSym()->getCtuTsToRsAddrMap(ctuTsAddr);
    const TComTile &currentTile = *(pcPic->getPicSym()->getTComTile(pcPic->getPicSym()->getTileIdxMap(ctuRsAddr)));
    const UInt firstCtuRsAddrOfTile = currentTile.getFirstCtuRsAddr();
    const UInt tileXPosInCtus = firstCtuRsAddrOfTile % frameWidthInCtus;
    const UInt tileYPosInCtus = firstCtuRsAddrOfTile / frameWidthInCtus;
    const UInt ctuXPosInCtus  = ctuRsAddr % frameWidthInCtus;
    const UInt ctuYPosInCtus  = ctuRsAddr / frameWidthInCtus;
    const UInt uiSubStrm=pcPic->getSubstreamForCtuAddr(ctuRsAddr, true, pcSlice)-subStreamOffset;
    TComDataCU* pCtu = pcPic->getCtu( ctuRsAddr );
    pCtu->initCtu( pcPic, ctuRsAddr );

    m_pcEntropyDecoder->setBitstream( ppcSubstreams[uiSubStrm] );

    // set up CABAC contexts' state for this CTU
    if (ctuRsAddr == firstCtuRsAddrOfTile)
    {
      if (ctuTsAddr != startCtuTsAddr) // if it is the first CTU, then the entropy coder has already been reset
      {
        m_pcEntropyDecoder->resetEntropy(pcSlice);
      }
    }
    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_pcEntropyDecoder->resetEntropy(pcSlice);
      }
      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, so use it.
          pcSbacDecoder->loadContexts( &m_entropyCodingSyncContextState );
        }
      }
    }

#if ENC_DEC_TRACE
    g_bJustDoIt = g_bEncDecTraceEnable;
#endif

    if ( pcSlice->getSPS()->getUseSAO() )
    {
      SAOBlkParam& saoblkParam = (pcPic->getPicSym()->getSAOBlkParam())[ctuRsAddr];
      Bool bIsSAOSliceEnabled = false;
      Bool sliceEnabled[MAX_NUM_COMPONENT];
      for(Int comp=0; comp < MAX_NUM_COMPONENT; comp++)
      {
        ComponentID compId=ComponentID(comp);
        sliceEnabled[compId] = pcSlice->getSaoEnabledFlag(toChannelType(compId)) && (comp < pcPic->getNumberValidComponents());
        if (sliceEnabled[compId]) bIsSAOSliceEnabled=true;
        saoblkParam[compId].modeIdc = SAO_MODE_OFF;
      }
      if (bIsSAOSliceEnabled)
      {
        Bool leftMergeAvail = false;
        Bool aboveMergeAvail= false;

        //merge left condition
        Int rx = (ctuRsAddr % frameWidthInCtus);
        if(rx > 0)
        {
          leftMergeAvail = pcPic->getSAOMergeAvailability(ctuRsAddr, ctuRsAddr-1);
        }
        //merge up condition
        Int ry = (ctuRsAddr / frameWidthInCtus);
        if(ry > 0)
        {
          aboveMergeAvail = pcPic->getSAOMergeAvailability(ctuRsAddr, ctuRsAddr-frameWidthInCtus);
        }
#if SVC_EXTENSION
        pcSbacDecoder->parseSAOBlkParam( saoblkParam, m_saoMaxOffsetQVal, sliceEnabled, leftMergeAvail, aboveMergeAvail);
#else
        pcSbacDecoder->parseSAOBlkParam( saoblkParam, sliceEnabled, leftMergeAvail, aboveMergeAvail);
#endif      
      }
    }

    m_pcCuDecoder->decodeCtu     ( pCtu, isLastCtuOfSliceSegment );
    m_pcCuDecoder->decompressCtu ( pCtu );

#if ENC_DEC_TRACE
    g_bJustDoIt = g_bEncDecTraceDisable;
#endif

    //Store probabilities of second CTU in line into buffer
    if ( ctuXPosInCtus == tileXPosInCtus+1 && wavefrontsEnabled)
    {
      m_entropyCodingSyncContextState.loadContexts( pcSbacDecoder );
    }

    // Should the sub-stream/stream be terminated after this CTU?
    // (end of slice-segment, end of tile, end of wavefront-CTU-row)
    if (isLastCtuOfSliceSegment ||
         (  ctuXPosInCtus + 1 == tileXPosInCtus + currentTile.getTileWidthInCtus() &&
          ( ctuYPosInCtus + 1 == tileYPosInCtus + currentTile.getTileHeightInCtus() || wavefrontsEnabled)
         )
       )
    {
      UInt binVal;
      pcSbacDecoder->parseTerminatingBit( binVal );
      assert( binVal );
#if DECODER_CHECK_SUBSTREAM_AND_SLICE_TRAILING_BYTES
      pcSbacDecoder->parseRemainingBytes(!isLastCtuOfSliceSegment);
#endif

      if (isLastCtuOfSliceSegment)
      {
        if(!pcSlice->getDependentSliceSegmentFlag())
        {
          pcSlice->setSliceCurEndCtuTsAddr( ctuTsAddr+1 );
        }
        pcSlice->setSliceSegmentCurEndCtuTsAddr( ctuTsAddr+1 );
        break;
      }
    }
  }

  assert(isLastCtuOfSliceSegment == true);


  if( depSliceSegmentsEnabled )
  {
    m_lastSliceSegmentEndContextState.loadContexts( pcSbacDecoder );//ctx end of dep.slice
  }

}

ParameterSetManagerDecoder::ParameterSetManagerDecoder()
#if !SVC_EXTENSION
: m_vpsBuffer(MAX_NUM_VPS)
, m_spsBuffer(MAX_NUM_SPS)
, m_ppsBuffer(MAX_NUM_PPS)
#endif
{
}

ParameterSetManagerDecoder::~ParameterSetManagerDecoder()
{

}

TComVPS* ParameterSetManagerDecoder::getPrefetchedVPS  (Int vpsId)
{
  if (m_vpsBuffer.getPS(vpsId) != NULL )
  {
    return m_vpsBuffer.getPS(vpsId);
  }
  else
  {
    return getVPS(vpsId);
  }
}


TComSPS* ParameterSetManagerDecoder::getPrefetchedSPS  (Int spsId)
{
  if (m_spsBuffer.getPS(spsId) != NULL )
  {
    return m_spsBuffer.getPS(spsId);
  }
  else
  {
    return getSPS(spsId);
  }
}

TComPPS* ParameterSetManagerDecoder::getPrefetchedPPS  (Int ppsId)
{
  if (m_ppsBuffer.getPS(ppsId) != NULL )
  {
    return m_ppsBuffer.getPS(ppsId);
  }
  else
  {
    return getPPS(ppsId);
  }
}

Void     ParameterSetManagerDecoder::applyPrefetchedPS()
{
  m_vpsMap.mergePSList(m_vpsBuffer);
  m_ppsMap.mergePSList(m_ppsBuffer);
  m_spsMap.mergePSList(m_spsBuffer);
}

//! \}