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/** \file DecSlice.cpp
\brief slice decoder class
*/
#include "DecSlice.h"
#include "CommonLib/UnitTools.h"
#include "CommonLib/dtrace_next.h"
#include <vector>
//! \ingroup DecoderLib
//! \{
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
DecSlice::DecSlice()
{
}
DecSlice::~DecSlice()
{
}
void DecSlice::create()
{
}
void DecSlice::destroy()
{
}
void DecSlice::init( CABACDecoder* cabacDecoder, DecCu* pcCuDecoder )
{
m_CABACDecoder = cabacDecoder;
m_pcCuDecoder = pcCuDecoder;
}
void DecSlice::decompressSlice( Slice* slice, InputBitstream* bitstream )
{
//-- For time output for each slice
slice->startProcessingTimer();
const SPS* sps = slice->getSPS();
Picture* pic = slice->getPic();
#if HEVC_TILES_WPP
const TileMap& tileMap = *pic->tileMap;
#endif
CABACReader& cabacReader = *m_CABACDecoder->getCABACReader( 0 );
// setup coding structure
CodingStructure& cs = *pic->cs;
cs.slice = slice;
cs.sps = sps;
cs.pps = slice->getPPS();
#if HEVC_VPS
cs.vps = slice->getVPS();
#endif
cs.pcv = slice->getPPS()->pcv;
cs.chromaQpAdj = 0;
cs.picture->resizeSAO(cs.pcv->sizeInCtus, 0);
cs.picture->resizeAlfCtuEnableFlag( cs.pcv->sizeInCtus );
const unsigned numSubstreams = slice->getNumberOfSubstreamSizes() + 1;
// init each couple {EntropyDecoder, Substream}
// Table of extracted substreams.
std::vector<InputBitstream*> ppcSubstreams( numSubstreams );
for( unsigned idx = 0; idx < numSubstreams; idx++ )
{
ppcSubstreams[idx] = bitstream->extractSubstream( idx+1 < numSubstreams ? ( slice->getSubstreamSize(idx) << 3 ) : bitstream->getNumBitsLeft() );
}
#if HEVC_DEPENDENT_SLICES
const int startCtuTsAddr = slice->getSliceSegmentCurStartCtuTsAddr();
#else
const int startCtuTsAddr = slice->getSliceCurStartCtuTsAddr();
#endif
#if HEVC_TILES_WPP
const int startCtuRsAddr = tileMap.getCtuTsToRsAddrMap(startCtuTsAddr);
#else
#if HEVC_DEPENDENT_SLICES
const int startCtuRsAddr = startCtuTsAddr;
#endif
#endif
const unsigned numCtusInFrame = cs.pcv->sizeInCtus;
const unsigned widthInCtus = cs.pcv->widthInCtus;
#if HEVC_DEPENDENT_SLICES
const bool depSliceSegmentsEnabled = cs.pps->getDependentSliceSegmentsEnabledFlag();
#endif
#if HEVC_TILES_WPP
const bool wavefrontsEnabled = cs.pps->getEntropyCodingSyncEnabledFlag();
#endif
cabacReader.initBitstream( ppcSubstreams[0] );
cabacReader.initCtxModels( *slice );
// Quantization parameter
#if HEVC_DEPENDENT_SLICES
if(!slice->getDependentSliceSegmentFlag())
{
#endif
pic->m_prevQP[0] = pic->m_prevQP[1] = slice->getSliceQp();
#if HEVC_DEPENDENT_SLICES
}
#endif
CHECK( pic->m_prevQP[0] == std::numeric_limits<int>::max(), "Invalid previous QP" );
DTRACE( g_trace_ctx, D_HEADER, "=========== POC: %d ===========\n", slice->getPOC() );
// 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.
#if HEVC_DEPENDENT_SLICES
const unsigned subStreamOffset = tileMap.getSubstreamForCtuAddr( startCtuRsAddr, true, slice );
#elif HEVC_TILES_WPP
const unsigned subStreamOffset = 0;
#endif
#if HEVC_DEPENDENT_SLICES
if( depSliceSegmentsEnabled )
{
// modify initial contexts with previous slice segment if this is a dependent slice.
const unsigned startTileIdx = tileMap.getTileIdxMap(startCtuRsAddr);
const Tile& currentTile = tileMap.tiles[startTileIdx];
const unsigned firstCtuRsAddrOfTile = currentTile.getFirstCtuRsAddr();
if( slice->getDependentSliceSegmentFlag() && startCtuRsAddr != firstCtuRsAddrOfTile )
{
if( currentTile.getTileWidthInCtus() >= 2 || !wavefrontsEnabled )
{
cabacReader.getCtx() = m_lastSliceSegmentEndContextState;
}
}
}
#endif
// for every CTU in the slice segment...
bool isLastCtuOfSliceSegment = false;
for( unsigned ctuTsAddr = startCtuTsAddr; !isLastCtuOfSliceSegment && ctuTsAddr < numCtusInFrame; ctuTsAddr++ )
{
#if HEVC_TILES_WPP
const unsigned ctuRsAddr = tileMap.getCtuTsToRsAddrMap(ctuTsAddr);
const Tile& currentTile = tileMap.tiles[ tileMap.getTileIdxMap(ctuRsAddr) ];
const unsigned firstCtuRsAddrOfTile = currentTile.getFirstCtuRsAddr();
const unsigned tileXPosInCtus = firstCtuRsAddrOfTile % widthInCtus;
const unsigned tileYPosInCtus = firstCtuRsAddrOfTile / widthInCtus;
#else
const unsigned ctuRsAddr = ctuTsAddr;
#endif
const unsigned ctuXPosInCtus = ctuRsAddr % widthInCtus;
const unsigned ctuYPosInCtus = ctuRsAddr / widthInCtus;
#if HEVC_TILES_WPP
const unsigned subStrmId = tileMap.getSubstreamForCtuAddr( ctuRsAddr, true, slice ) - subStreamOffset;
#else
const unsigned subStrmId = 0;
#endif
const unsigned maxCUSize = sps->getMaxCUWidth();
Position pos( ctuXPosInCtus*maxCUSize, ctuYPosInCtus*maxCUSize) ;
UnitArea ctuArea(cs.area.chromaFormat, Area( pos.x, pos.y, maxCUSize, maxCUSize ) );
DTRACE_UPDATE( g_trace_ctx, std::make_pair( "ctu", ctuRsAddr ) );
cabacReader.initBitstream( ppcSubstreams[subStrmId] );
#if HEVC_TILES_WPP
// 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
{
cabacReader.initCtxModels( *slice );
}
pic->m_prevQP[0] = pic->m_prevQP[1] = slice->getSliceQp();
}
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
{
cabacReader.initCtxModels( *slice );
}
if( cs.getCURestricted( pos.offset(maxCUSize, -1), slice->getIndependentSliceIdx(), tileMap.getTileIdxMap( pos ), CH_L ) )
{
// Top-right is available, so use it.
cabacReader.getCtx() = m_entropyCodingSyncContextState;
}
pic->m_prevQP[0] = pic->m_prevQP[1] = slice->getSliceQp();
}
#endif
#if JVET_L0646_GBI
bool updateGbiCodingOrder = cs.slice->getSliceType() == B_SLICE && ctuTsAddr == startCtuTsAddr;
if(updateGbiCodingOrder)
{
resetGbiCodingOrder(true, cs);
}
#endif
#if JVET_L0158_L0106_RESET_BUFFER
if (cs.slice->getSliceType() != I_SLICE && ctuXPosInCtus == 0)
{
cs.slice->resetMotionLUTs();
}
#endif
isLastCtuOfSliceSegment = cabacReader.coding_tree_unit( cs, ctuArea, pic->m_prevQP, ctuRsAddr );
m_pcCuDecoder->decompressCtu( cs, ctuArea );
#if HEVC_TILES_WPP
if( ctuXPosInCtus == tileXPosInCtus+1 && wavefrontsEnabled )
{
m_entropyCodingSyncContextState = cabacReader.getCtx();
}
#endif
if( isLastCtuOfSliceSegment )
{
#if DECODER_CHECK_SUBSTREAM_AND_SLICE_TRAILING_BYTES
cabacReader.remaining_bytes( false );
#endif
#if HEVC_DEPENDENT_SLICES
if( !slice->getDependentSliceSegmentFlag() )
{
#endif
slice->setSliceCurEndCtuTsAddr( ctuTsAddr+1 );
#if HEVC_DEPENDENT_SLICES
}
slice->setSliceSegmentCurEndCtuTsAddr( ctuTsAddr+1 );
#endif
}
#if HEVC_TILES_WPP
else if( ( ctuXPosInCtus + 1 == tileXPosInCtus + currentTile.getTileWidthInCtus () ) &&
( ctuYPosInCtus + 1 == tileYPosInCtus + currentTile.getTileHeightInCtus() || wavefrontsEnabled ) )
{
// The sub-stream/stream should be terminated after this CTU.
// (end of slice-segment, end of tile, end of wavefront-CTU-row)
unsigned binVal = cabacReader.terminating_bit();
CHECK( !binVal, "Expecting a terminating bit" );
#if DECODER_CHECK_SUBSTREAM_AND_SLICE_TRAILING_BYTES
cabacReader.remaining_bytes( true );
#endif
}
#endif
}
CHECK( !isLastCtuOfSliceSegment, "Last CTU of slice segment not signalled as such" );
#if HEVC_DEPENDENT_SLICES
if( depSliceSegmentsEnabled )
{
m_lastSliceSegmentEndContextState = cabacReader.getCtx(); //ctx end of dep.slice
}
#endif
// deallocate all created substreams, including internal buffers.
for( auto substr: ppcSubstreams )
{
delete substr;
}
slice->stopProcessingTimer();
}
//! \}