/* The copyright in this software is being made available under the BSD
* License, included below. This software may be subject to other third party
* and contributor rights, including patent rights, and no such rights are
* granted under this license.
*
* Copyright (c) 2010-2021, ITU/ISO/IEC
* All rights reserved.
*
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* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
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* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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/** \file CABACReader.cpp
* \brief Reader for low level syntax
*/
#include "CABACReader.h"
#include "CommonLib/CodingStructure.h"
#include "CommonLib/TrQuant.h"
#include "CommonLib/UnitTools.h"
#include "CommonLib/SampleAdaptiveOffset.h"
#include "CommonLib/dtrace_next.h"
#include "CommonLib/Picture.h"
#if RExt__DECODER_DEBUG_BIT_STATISTICS
#include "CommonLib/CodingStatistics.h"
#endif
#if RExt__DECODER_DEBUG_BIT_STATISTICS
#define RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(x) const CodingStatisticsClassType CSCT(x); m_BinDecoder.set( CSCT )
#define RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET2(x,y) const CodingStatisticsClassType CSCT(x,y); m_BinDecoder.set( CSCT )
#define RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE(x,s) const CodingStatisticsClassType CSCT(x, s.width, s.height); m_BinDecoder.set( CSCT )
#define RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2(x,s,z) const CodingStatisticsClassType CSCT(x, s.width, s.height, z); m_BinDecoder.set( CSCT )
#define RExt__DECODER_DEBUG_BIT_STATISTICS_SET(x) m_BinDecoder.set( x );
#else
#define RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(x)
#define RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET2(x,y)
#define RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE(x,s)
#define RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2(x,s,z)
#define RExt__DECODER_DEBUG_BIT_STATISTICS_SET(x)
#endif
void CABACReader::initCtxModels( Slice& slice )
{
SliceType sliceType = slice.getSliceType();
int qp = slice.getSliceQp();
if( slice.getPPS()->getCabacInitPresentFlag() && slice.getCabacInitFlag() )
{
switch( sliceType )
{
case P_SLICE: // change initialization table to B_SLICE initialization
sliceType = B_SLICE;
break;
case B_SLICE: // change initialization table to P_SLICE initialization
sliceType = P_SLICE;
break;
default : // should not occur
THROW( "Invalid slice type" );
break;
}
}
m_BinDecoder.reset( qp, (int)sliceType );
#if JVET_V0106_RRC_RICE
m_BinDecoder.setBaseLevel(slice.getRiceBaseLevel());
m_BinDecoder.riceStatReset(slice.getSPS()->getBitDepth(CHANNEL_TYPE_LUMA));
#endif
}
//================================================================================
// clause 7.3.8.1
//--------------------------------------------------------------------------------
// bool terminating_bit()
// void remaining_bytes( noTrailingBytesExpected )
//================================================================================
bool CABACReader::terminating_bit()
{
if( m_BinDecoder.decodeBinTrm() )
{
m_BinDecoder.finish();
#if RExt__DECODER_DEBUG_BIT_STATISTICS
CodingStatistics::IncrementStatisticEP( STATS__TRAILING_BITS, m_Bitstream->readOutTrailingBits(), 0 );
#else
m_Bitstream->readOutTrailingBits();
#endif
return true;
}
return false;
}
void CABACReader::remaining_bytes( bool noTrailingBytesExpected )
{
if( noTrailingBytesExpected )
{
CHECK( 0 != m_Bitstream->getNumBitsLeft(), "Bits left when not supposed" );
}
else
{
while( m_Bitstream->getNumBitsLeft() )
{
unsigned trailingNullByte = m_Bitstream->readByte();
if( trailingNullByte != 0 )
{
THROW( "Trailing byte should be '0', but has a value of " << std::hex << trailingNullByte << std::dec << "\n" );
}
}
}
}
//================================================================================
// clause 7.3.8.2
//--------------------------------------------------------------------------------
// void coding_tree_unit( cs, area, qpL, qpC, ctuRsAddr )
//================================================================================
void CABACReader::coding_tree_unit( CodingStructure& cs, const UnitArea& area, int (&qps)[2], unsigned ctuRsAddr )
{
CUCtx cuCtx( qps[CH_L] );
QTBTPartitioner partitioner;
partitioner.initCtu(area, CH_L, *cs.slice);
cs.treeType = partitioner.treeType = TREE_D;
cs.modeType = partitioner.modeType = MODE_TYPE_ALL;
sao( cs, ctuRsAddr );
if (cs.sps->getALFEnabledFlag() && (cs.slice->getAlfEnabledFlag(COMPONENT_Y)))
{
const PreCalcValues& pcv = *cs.pcv;
int frame_width_in_ctus = pcv.widthInCtus;
int ry = ctuRsAddr / frame_width_in_ctus;
int rx = ctuRsAddr - ry * frame_width_in_ctus;
const Position pos( rx * cs.pcv->maxCUWidth, ry * cs.pcv->maxCUHeight );
const uint32_t curSliceIdx = cs.slice->getIndependentSliceIdx();
const uint32_t curTileIdx = cs.pps->getTileIdx( pos );
bool leftAvail = cs.getCURestricted( pos.offset( -(int)pcv.maxCUWidth, 0 ), pos, curSliceIdx, curTileIdx, CH_L ) ? true : false;
bool aboveAvail = cs.getCURestricted( pos.offset( 0, -(int)pcv.maxCUHeight ), pos, curSliceIdx, curTileIdx, CH_L ) ? true : false;
int leftCTUAddr = leftAvail ? ctuRsAddr - 1 : -1;
int aboveCTUAddr = aboveAvail ? ctuRsAddr - frame_width_in_ctus : -1;
for( int compIdx = 0; compIdx < MAX_NUM_COMPONENT; compIdx++ )
{
if (cs.slice->getAlfEnabledFlag((ComponentID)compIdx))
{
uint8_t* ctbAlfFlag = cs.slice->getPic()->getAlfCtuEnableFlag( compIdx );
int ctx = 0;
ctx += leftCTUAddr > -1 ? ( ctbAlfFlag[leftCTUAddr] ? 1 : 0 ) : 0;
ctx += aboveCTUAddr > -1 ? ( ctbAlfFlag[aboveCTUAddr] ? 1 : 0 ) : 0;
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(STATS__CABAC_BITS__ALF);
ctbAlfFlag[ctuRsAddr] = m_BinDecoder.decodeBin( Ctx::ctbAlfFlag( compIdx * 3 + ctx ) );
if (isLuma((ComponentID)compIdx) && ctbAlfFlag[ctuRsAddr])
{
readAlfCtuFilterIndex(cs, ctuRsAddr);
}
if( isChroma( (ComponentID)compIdx ) )
{
int apsIdx = cs.slice->getAlfApsIdChroma();
CHECK(cs.slice->getAlfAPSs()[apsIdx] == nullptr, "APS not initialized");
const AlfParam& alfParam = cs.slice->getAlfAPSs()[apsIdx]->getAlfAPSParam();
const int numAlts = alfParam.numAlternativesChroma;
uint8_t* ctbAlfAlternative = cs.slice->getPic()->getAlfCtuAlternativeData( compIdx );
ctbAlfAlternative[ctuRsAddr] = 0;
if( ctbAlfFlag[ctuRsAddr] )
{
uint8_t decoded = 0;
while( decoded < numAlts-1 && m_BinDecoder.decodeBin( Ctx::ctbAlfAlternative( compIdx-1 ) ) )
++ decoded;
ctbAlfAlternative[ctuRsAddr] = decoded;
}
}
}
}
}
if (cs.sps->getCCALFEnabledFlag())
{
for ( int compIdx = 1; compIdx < getNumberValidComponents( cs.pcv->chrFormat ); compIdx++ )
{
if (cs.slice->m_ccAlfFilterParam.ccAlfFilterEnabled[compIdx - 1])
{
const int filterCount = cs.slice->m_ccAlfFilterParam.ccAlfFilterCount[compIdx - 1];
const int ry = ctuRsAddr / cs.pcv->widthInCtus;
const int rx = ctuRsAddr % cs.pcv->widthInCtus;
const Position lumaPos(rx * cs.pcv->maxCUWidth, ry * cs.pcv->maxCUHeight);
ccAlfFilterControlIdc(cs, ComponentID(compIdx), ctuRsAddr, cs.slice->m_ccAlfFilterControl[compIdx - 1], lumaPos,
filterCount);
}
}
}
if ( CS::isDualITree(cs) && cs.pcv->chrFormat != CHROMA_400 && cs.pcv->maxCUWidth > 64 )
{
QTBTPartitioner chromaPartitioner;
chromaPartitioner.initCtu(area, CH_C, *cs.slice);
CUCtx cuCtxChroma(qps[CH_C]);
coding_tree(cs, partitioner, cuCtx, &chromaPartitioner, &cuCtxChroma);
qps[CH_L] = cuCtx.qp;
qps[CH_C] = cuCtxChroma.qp;
}
else
{
coding_tree(cs, partitioner, cuCtx);
qps[CH_L] = cuCtx.qp;
if( CS::isDualITree( cs ) && cs.pcv->chrFormat != CHROMA_400 )
{
CUCtx cuCtxChroma( qps[CH_C] );
partitioner.initCtu(area, CH_C, *cs.slice);
coding_tree(cs, partitioner, cuCtxChroma);
qps[CH_C] = cuCtxChroma.qp;
}
}
DTRACE_COND( ctuRsAddr == 0, g_trace_ctx, D_QP_PER_CTU, "\n%4d %2d", cs.picture->poc, cs.slice->getSliceQpBase() );
DTRACE ( g_trace_ctx, D_QP_PER_CTU, " %3d", qps[CH_L] - cs.slice->getSliceQpBase() );
}
void CABACReader::readAlfCtuFilterIndex(CodingStructure& cs, unsigned ctuRsAddr)
{
short* alfCtbFilterSetIndex = cs.slice->getPic()->getAlfCtbFilterIndex();
unsigned numAps = cs.slice->getNumAlfApsIdsLuma();
unsigned numAvailableFiltSets = numAps + NUM_FIXED_FILTER_SETS;
uint32_t filtIndex = 0;
if (numAvailableFiltSets > NUM_FIXED_FILTER_SETS)
{
unsigned usePrevFilt = m_BinDecoder.decodeBin(Ctx::AlfUseTemporalFilt());
if (usePrevFilt)
{
if (numAps > 1)
{
xReadTruncBinCode(filtIndex, numAvailableFiltSets - NUM_FIXED_FILTER_SETS);
}
filtIndex += (unsigned)(NUM_FIXED_FILTER_SETS);
}
else
{
xReadTruncBinCode(filtIndex, NUM_FIXED_FILTER_SETS);
}
}
else
{
xReadTruncBinCode(filtIndex, NUM_FIXED_FILTER_SETS);
}
alfCtbFilterSetIndex[ctuRsAddr] = filtIndex;
}
void CABACReader::ccAlfFilterControlIdc(CodingStructure &cs, const ComponentID compID, const int curIdx,
uint8_t *filterControlIdc, Position lumaPos, int filterCount)
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__CROSS_COMPONENT_ALF_BLOCK_LEVEL_IDC );
Position leftLumaPos = lumaPos.offset(-(int)cs.pcv->maxCUWidth, 0);
Position aboveLumaPos = lumaPos.offset(0, -(int)cs.pcv->maxCUWidth);
const uint32_t curSliceIdx = cs.slice->getIndependentSliceIdx();
const uint32_t curTileIdx = cs.pps->getTileIdx( lumaPos );
bool leftAvail = cs.getCURestricted( leftLumaPos, lumaPos, curSliceIdx, curTileIdx, CH_L ) ? true : false;
bool aboveAvail = cs.getCURestricted( aboveLumaPos, lumaPos, curSliceIdx, curTileIdx, CH_L ) ? true : false;
int ctxt = 0;
if (leftAvail)
{
ctxt += ( filterControlIdc[curIdx - 1] ) ? 1 : 0;
}
if (aboveAvail)
{
ctxt += ( filterControlIdc[curIdx - cs.pcv->widthInCtus] ) ? 1 : 0;
}
ctxt += ( compID == COMPONENT_Cr ) ? 3 : 0;
int idcVal = m_BinDecoder.decodeBin( Ctx::CcAlfFilterControlFlag( ctxt ) );
if ( idcVal )
{
while ( ( idcVal != filterCount ) && m_BinDecoder.decodeBinEP() )
{
idcVal++;
}
}
filterControlIdc[curIdx] = idcVal;
DTRACE(g_trace_ctx, D_SYNTAX, "ccAlfFilterControlIdc() compID=%d pos=(%d,%d) ctxt=%d, filterCount=%d, idcVal=%d\n",
compID, lumaPos.x, lumaPos.y, ctxt, filterCount, idcVal);
}
//================================================================================
// clause 7.3.8.3
//--------------------------------------------------------------------------------
// void sao( slice, ctuRsAddr )
//================================================================================
void CABACReader::sao( CodingStructure& cs, unsigned ctuRsAddr )
{
const SPS& sps = *cs.sps;
if( !sps.getSAOEnabledFlag() )
{
return;
}
const Slice& slice = *cs.slice;
SAOBlkParam& sao_ctu_pars = cs.picture->getSAO()[ctuRsAddr];
bool slice_sao_luma_flag = ( slice.getSaoEnabledFlag( CHANNEL_TYPE_LUMA ) );
bool slice_sao_chroma_flag = ( slice.getSaoEnabledFlag( CHANNEL_TYPE_CHROMA ) && sps.getChromaFormatIdc() != CHROMA_400 );
sao_ctu_pars[ COMPONENT_Y ].modeIdc = SAO_MODE_OFF;
sao_ctu_pars[ COMPONENT_Cb ].modeIdc = SAO_MODE_OFF;
sao_ctu_pars[ COMPONENT_Cr ].modeIdc = SAO_MODE_OFF;
if( !slice_sao_luma_flag && !slice_sao_chroma_flag )
{
return;
}
// merge
int frame_width_in_ctus = cs.pcv->widthInCtus;
int ry = ctuRsAddr / frame_width_in_ctus;
int rx = ctuRsAddr - ry * frame_width_in_ctus;
int sao_merge_type = -1;
const Position pos( rx * cs.pcv->maxCUWidth, ry * cs.pcv->maxCUHeight );
const unsigned curSliceIdx = cs.slice->getIndependentSliceIdx();
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__SAO );
const unsigned curTileIdx = cs.pps->getTileIdx( pos );
if( cs.getCURestricted( pos.offset(-(int)cs.pcv->maxCUWidth, 0), pos, curSliceIdx, curTileIdx, CH_L ) )
{
// sao_merge_left_flag
sao_merge_type += int( m_BinDecoder.decodeBin( Ctx::SaoMergeFlag() ) );
}
if( sao_merge_type < 0 && cs.getCURestricted( pos.offset(0, -(int)cs.pcv->maxCUHeight), pos, curSliceIdx, curTileIdx, CH_L ) )
{
// sao_merge_above_flag
sao_merge_type += int( m_BinDecoder.decodeBin( Ctx::SaoMergeFlag() ) ) << 1;
}
if( sao_merge_type >= 0 )
{
if( slice_sao_luma_flag || slice_sao_chroma_flag )
{
sao_ctu_pars[ COMPONENT_Y ].modeIdc = SAO_MODE_MERGE;
sao_ctu_pars[ COMPONENT_Y ].typeIdc = sao_merge_type;
}
if( slice_sao_chroma_flag )
{
sao_ctu_pars[ COMPONENT_Cb ].modeIdc = SAO_MODE_MERGE;
sao_ctu_pars[ COMPONENT_Cr ].modeIdc = SAO_MODE_MERGE;
sao_ctu_pars[ COMPONENT_Cb ].typeIdc = sao_merge_type;
sao_ctu_pars[ COMPONENT_Cr ].typeIdc = sao_merge_type;
}
return;
}
// explicit parameters
ComponentID firstComp = ( slice_sao_luma_flag ? COMPONENT_Y : COMPONENT_Cb );
ComponentID lastComp = ( slice_sao_chroma_flag ? COMPONENT_Cr : COMPONENT_Y );
for( ComponentID compID = firstComp; compID <= lastComp; compID = ComponentID( compID + 1 ) )
{
SAOOffset& sao_pars = sao_ctu_pars[ compID ];
// sao_type_idx_luma / sao_type_idx_chroma
if( compID != COMPONENT_Cr )
{
if( m_BinDecoder.decodeBin( Ctx::SaoTypeIdx() ) )
{
if( m_BinDecoder.decodeBinEP( ) )
{
// edge offset
sao_pars.modeIdc = SAO_MODE_NEW;
sao_pars.typeIdc = SAO_TYPE_START_EO;
}
else
{
// band offset
sao_pars.modeIdc = SAO_MODE_NEW;
sao_pars.typeIdc = SAO_TYPE_START_BO;
}
}
}
else //Cr, follow Cb SAO type
{
sao_pars.modeIdc = sao_ctu_pars[ COMPONENT_Cb ].modeIdc;
sao_pars.typeIdc = sao_ctu_pars[ COMPONENT_Cb ].typeIdc;
}
if( sao_pars.modeIdc == SAO_MODE_OFF )
{
continue;
}
// sao_offset_abs
int offset[4];
const int maxOffsetQVal = SampleAdaptiveOffset::getMaxOffsetQVal( sps.getBitDepth( toChannelType(compID) ) );
offset [0] = (int)unary_max_eqprob( maxOffsetQVal );
offset [1] = (int)unary_max_eqprob( maxOffsetQVal );
offset [2] = (int)unary_max_eqprob( maxOffsetQVal );
offset [3] = (int)unary_max_eqprob( maxOffsetQVal );
// band offset mode
if( sao_pars.typeIdc == SAO_TYPE_START_BO )
{
// sao_offset_sign
for( int k = 0; k < 4; k++ )
{
if( offset[k] && m_BinDecoder.decodeBinEP( ) )
{
offset[k] = -offset[k];
}
}
// sao_band_position
sao_pars.typeAuxInfo = m_BinDecoder.decodeBinsEP( NUM_SAO_BO_CLASSES_LOG2 );
for( int k = 0; k < 4; k++ )
{
sao_pars.offset[ ( sao_pars.typeAuxInfo + k ) % MAX_NUM_SAO_CLASSES ] = offset[k];
}
continue;
}
// edge offset mode
sao_pars.typeAuxInfo = 0;
if( compID != COMPONENT_Cr )
{
// sao_eo_class_luma / sao_eo_class_chroma
sao_pars.typeIdc += m_BinDecoder.decodeBinsEP( NUM_SAO_EO_TYPES_LOG2 );
}
else
{
sao_pars.typeIdc = sao_ctu_pars[ COMPONENT_Cb ].typeIdc;
}
sao_pars.offset[ SAO_CLASS_EO_FULL_VALLEY ] = offset[0];
sao_pars.offset[ SAO_CLASS_EO_HALF_VALLEY ] = offset[1];
sao_pars.offset[ SAO_CLASS_EO_PLAIN ] = 0;
sao_pars.offset[ SAO_CLASS_EO_HALF_PEAK ] = -offset[2];
sao_pars.offset[ SAO_CLASS_EO_FULL_PEAK ] = -offset[3];
}
}
//================================================================================
// clause 7.3.8.4
//--------------------------------------------------------------------------------
// void coding_tree ( cs, partitioner, cuCtx )
// bool split_cu_flag ( cs, partitioner )
// split split_cu_mode_mt ( cs, partitioner )
//================================================================================
void CABACReader::coding_tree( CodingStructure& cs, Partitioner& partitioner, CUCtx& cuCtx, Partitioner* pPartitionerChroma, CUCtx* pCuCtxChroma)
{
const PPS &pps = *cs.pps;
const UnitArea &currArea = partitioner.currArea();
// Reset delta QP coding flag and ChromaQPAdjustemt coding flag
//Note: do not reset qg at chroma CU
if( pps.getUseDQP() && partitioner.currQgEnable() && !isChroma(partitioner.chType) )
{
cuCtx.qgStart = true;
cuCtx.isDQPCoded = false;
}
if( cs.slice->getUseChromaQpAdj() && partitioner.currQgChromaEnable() )
{
cuCtx.isChromaQpAdjCoded = false;
cs.chromaQpAdj = 0;
}
// Reset delta QP coding flag and ChromaQPAdjustemt coding flag
if (CS::isDualITree(cs) && pPartitionerChroma != nullptr)
{
if (pps.getUseDQP() && pPartitionerChroma->currQgEnable())
{
pCuCtxChroma->qgStart = true;
pCuCtxChroma->isDQPCoded = false;
}
if (cs.slice->getUseChromaQpAdj() && pPartitionerChroma->currQgChromaEnable())
{
pCuCtxChroma->isChromaQpAdjCoded = false;
cs.chromaQpAdj = 0;
}
}
const PartSplit splitMode = split_cu_mode( cs, partitioner );
CHECK( !partitioner.canSplit( splitMode, cs ), "Got an invalid split!" );
if( splitMode != CU_DONT_SPLIT )
{
if (CS::isDualITree(cs) && pPartitionerChroma != nullptr
&& (partitioner.currArea().lwidth() >= 64 || partitioner.currArea().lheight() >= 64))
{
partitioner.splitCurrArea(CU_QUAD_SPLIT, cs);
pPartitionerChroma->splitCurrArea(CU_QUAD_SPLIT, cs);
bool beContinue = true;
bool lumaContinue = true;
bool chromaContinue = true;
while (beContinue)
{
if (partitioner.currArea().lwidth() > 64 || partitioner.currArea().lheight() > 64)
{
if (cs.area.blocks[partitioner.chType].contains(partitioner.currArea().blocks[partitioner.chType].pos()))
{
coding_tree(cs, partitioner, cuCtx, pPartitionerChroma, pCuCtxChroma);
}
lumaContinue = partitioner.nextPart(cs);
chromaContinue = pPartitionerChroma->nextPart(cs);
CHECK(lumaContinue != chromaContinue, "luma chroma partition should be matched");
beContinue = lumaContinue;
}
else
{
// dual tree coding under 64x64 block
if (cs.area.blocks[partitioner.chType].contains(partitioner.currArea().blocks[partitioner.chType].pos()))
{
coding_tree(cs, partitioner, cuCtx);
}
lumaContinue = partitioner.nextPart(cs);
if (cs.area.blocks[pPartitionerChroma->chType].contains(
pPartitionerChroma->currArea().blocks[pPartitionerChroma->chType].pos()))
{
coding_tree(cs, *pPartitionerChroma, *pCuCtxChroma);
}
chromaContinue = pPartitionerChroma->nextPart(cs);
CHECK(lumaContinue != chromaContinue, "luma chroma partition should be matched");
beContinue = lumaContinue;
}
}
partitioner.exitCurrSplit();
pPartitionerChroma->exitCurrSplit();
// cat the chroma CUs together
CodingUnit *currentCu = cs.getCU(partitioner.currArea().lumaPos(), CHANNEL_TYPE_LUMA);
CodingUnit *nextCu = nullptr;
CodingUnit *tempLastLumaCu = nullptr;
CodingUnit *tempLastChromaCu = nullptr;
ChannelType currentChType = currentCu->chType;
while (currentCu->next != nullptr)
{
nextCu = currentCu->next;
if (currentChType != nextCu->chType && currentChType == CHANNEL_TYPE_LUMA)
{
tempLastLumaCu = currentCu;
if (tempLastChromaCu != nullptr) // swap
{
tempLastChromaCu->next = nextCu;
}
}
else if (currentChType != nextCu->chType && currentChType == CHANNEL_TYPE_CHROMA)
{
tempLastChromaCu = currentCu;
if (tempLastLumaCu != nullptr) // swap
{
tempLastLumaCu->next = nextCu;
}
}
currentCu = nextCu;
currentChType = currentCu->chType;
}
CodingUnit *chromaFirstCu = cs.getCU(pPartitionerChroma->currArea().chromaPos(), CHANNEL_TYPE_CHROMA);
tempLastLumaCu->next = chromaFirstCu;
}
else
{
const ModeType modeTypeParent = partitioner.modeType;
cs.modeType = partitioner.modeType = mode_constraint(cs, partitioner, splitMode); // change for child nodes
// decide chroma split or not
bool chromaNotSplit = modeTypeParent == MODE_TYPE_ALL && partitioner.modeType == MODE_TYPE_INTRA;
CHECK(chromaNotSplit && partitioner.chType != CHANNEL_TYPE_LUMA, "chType must be luma");
if (partitioner.treeType == TREE_D)
{
cs.treeType = partitioner.treeType = chromaNotSplit ? TREE_L : TREE_D;
}
partitioner.splitCurrArea( splitMode, cs );
do
{
if( cs.area.blocks[partitioner.chType].contains( partitioner.currArea().blocks[partitioner.chType].pos() ) )
{
coding_tree( cs, partitioner, cuCtx );
}
} while( partitioner.nextPart( cs ) );
partitioner.exitCurrSplit();
if( chromaNotSplit )
{
CHECK( partitioner.chType != CHANNEL_TYPE_LUMA, "must be luma status" );
partitioner.chType = CHANNEL_TYPE_CHROMA;
cs.treeType = partitioner.treeType = TREE_C;
if( cs.picture->blocks[partitioner.chType].contains( partitioner.currArea().blocks[partitioner.chType].pos() ) )
{
coding_tree( cs, partitioner, cuCtx );
}
//recover treeType
partitioner.chType = CHANNEL_TYPE_LUMA;
cs.treeType = partitioner.treeType = TREE_D;
}
//recover ModeType
cs.modeType = partitioner.modeType = modeTypeParent;
}
return;
}
CodingUnit& cu = cs.addCU( CS::getArea( cs, currArea, partitioner.chType ), partitioner.chType );
partitioner.setCUData( cu );
cu.slice = cs.slice;
cu.tileIdx = cs.pps->getTileIdx( currArea.lumaPos() );
CHECK( cu.cs->treeType != partitioner.treeType, "treeType mismatch" );
int lumaQPinLocalDualTree = -1;
// Predict QP on start of quantization group
if( cuCtx.qgStart )
{
cuCtx.qgStart = false;
cuCtx.qp = CU::predictQP( cu, cuCtx.qp );
}
if (pps.getUseDQP() && partitioner.isSepTree(cs) && isChroma(cu.chType))
{
const Position chromaCentral(cu.chromaPos().offset(cu.chromaSize().width >> 1, cu.chromaSize().height >> 1));
const Position lumaRefPos(chromaCentral.x << getComponentScaleX(COMPONENT_Cb, cu.chromaFormat), chromaCentral.y << getComponentScaleY(COMPONENT_Cb, cu.chromaFormat));
//derive chroma qp, but the chroma qp is saved in cuCtx.qp which is used for luma qp
//therefore, after decoding the chroma CU, the cuCtx.qp shall be recovered to luma qp in order to decode next luma cu qp
const CodingUnit* colLumaCu = cs.getLumaCU( lumaRefPos );
CHECK( colLumaCu == nullptr, "colLumaCU shall exist" );
lumaQPinLocalDualTree = cuCtx.qp;
if (colLumaCu)
{
cuCtx.qp = colLumaCu->qp;
}
}
cu.qp = cuCtx.qp; //NOTE: CU QP can be changed by deltaQP signaling at TU level
cu.chromaQpAdj = cs.chromaQpAdj; //NOTE: CU chroma QP adjustment can be changed by adjustment signaling at TU level
// coding unit
coding_unit( cu, partitioner, cuCtx );
//recover cuCtx.qp to luma qp after decoding the chroma CU
if( pps.getUseDQP() && partitioner.isSepTree( cs ) && isChroma( cu.chType ) )
{
cuCtx.qp = lumaQPinLocalDualTree;
}
uint32_t compBegin;
uint32_t numComp;
bool jointPLT = false;
if (cu.isSepTree())
{
if( cu.isLocalSepTree() )
{
compBegin = COMPONENT_Y;
numComp = (cu.chromaFormat != CHROMA_400)?3: 1;
jointPLT = true;
}
else
{
if (isLuma(partitioner.chType))
{
compBegin = COMPONENT_Y;
numComp = 1;
}
else
{
compBegin = COMPONENT_Cb;
numComp = 2;
}
}
}
else
{
compBegin = COMPONENT_Y;
numComp = (cu.chromaFormat != CHROMA_400) ? 3 : 1;
jointPLT = true;
}
if (CU::isPLT(cu))
{
cs.reorderPrevPLT(cs.prevPLT, cu.curPLTSize, cu.curPLT, cu.reuseflag, compBegin, numComp, jointPLT);
}
if( cu.chType == CHANNEL_TYPE_CHROMA )
{
DTRACE( g_trace_ctx, D_QP, "[chroma CU]x=%d, y=%d, w=%d, h=%d, qp=%d\n", cu.Cb().x, cu.Cb().y, cu.Cb().width, cu.Cb().height, cu.qp );
}
else
{
DTRACE(g_trace_ctx, D_QP, "x=%d, y=%d, w=%d, h=%d, qp=%d\n", cu.Y().x, cu.Y().y, cu.Y().width, cu.Y().height,
cu.qp);
}
}
ModeType CABACReader::mode_constraint( CodingStructure& cs, Partitioner &partitioner, PartSplit splitMode )
{
int val = cs.signalModeCons( splitMode, partitioner, partitioner.modeType );
if( val == LDT_MODE_TYPE_SIGNAL )
{
int ctxIdx = DeriveCtx::CtxModeConsFlag( cs, partitioner );
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__MODE_CONSTRAINT_FLAG, partitioner.currArea().blocks[partitioner.chType].size(), partitioner.chType );
bool flag = m_BinDecoder.decodeBin( Ctx::ModeConsFlag( ctxIdx ) );
DTRACE( g_trace_ctx, D_SYNTAX, "mode_cons_flag() flag=%d\n", flag );
return flag ? MODE_TYPE_INTRA : MODE_TYPE_INTER;
}
else if( val == LDT_MODE_TYPE_INFER )
{
return MODE_TYPE_INTRA;
}
else
{
return partitioner.modeType;
}
}
PartSplit CABACReader::split_cu_mode( CodingStructure& cs, Partitioner &partitioner )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__SPLIT_FLAG, partitioner.currArea().blocks[partitioner.chType].size(), partitioner.chType );
PartSplit mode = CU_DONT_SPLIT;
bool canNo, canQt, canBh, canBv, canTh, canTv;
partitioner.canSplit( cs, canNo, canQt, canBh, canBv, canTh, canTv );
bool canSpl[6] = { canNo, canQt, canBh, canBv, canTh, canTv };
unsigned ctxSplit = 0, ctxQtSplit = 0, ctxBttHV = 0, ctxBttH12 = 0, ctxBttV12;
DeriveCtx::CtxSplit( cs, partitioner, ctxSplit, ctxQtSplit, ctxBttHV, ctxBttH12, ctxBttV12, canSpl );
bool isSplit = canBh || canBv || canTh || canTv || canQt;
if( canNo && isSplit )
{
isSplit = m_BinDecoder.decodeBin( Ctx::SplitFlag( ctxSplit ) );
}
DTRACE( g_trace_ctx, D_SYNTAX, "split_cu_mode() ctx=%d split=%d\n", ctxSplit, isSplit );
if( !isSplit )
{
return CU_DONT_SPLIT;
}
const bool canBtt = canBh || canBv || canTh || canTv;
bool isQt = canQt;
if( isQt && canBtt )
{
isQt = m_BinDecoder.decodeBin( Ctx::SplitQtFlag( ctxQtSplit ) );
}
DTRACE( g_trace_ctx, D_SYNTAX, "split_cu_mode() ctx=%d qt=%d\n", ctxQtSplit, isQt );
if( isQt )
{
return CU_QUAD_SPLIT;
}
const bool canHor = canBh || canTh;
bool isVer = canBv || canTv;
if( isVer && canHor )
{
isVer = m_BinDecoder.decodeBin( Ctx::SplitHvFlag( ctxBttHV ) );
}
const bool can14 = isVer ? canTv : canTh;
bool is12 = isVer ? canBv : canBh;
if( is12 && can14 )
{
is12 = m_BinDecoder.decodeBin( Ctx::Split12Flag( isVer ? ctxBttV12 : ctxBttH12 ) );
}
if (isVer && is12)
{
mode = CU_VERT_SPLIT;
}
else if (isVer && !is12)
{
mode = CU_TRIV_SPLIT;
}
else if (!isVer && is12)
{
mode = CU_HORZ_SPLIT;
}
else
{
mode = CU_TRIH_SPLIT;
}
DTRACE( g_trace_ctx, D_SYNTAX, "split_cu_mode() ctxHv=%d ctx12=%d mode=%d\n", ctxBttHV, isVer ? ctxBttV12 : ctxBttH12, mode );
return mode;
}
//================================================================================
// clause 7.3.8.5
//--------------------------------------------------------------------------------
// void coding_unit ( cu, partitioner, cuCtx )
// void cu_skip_flag ( cu )
// void pred_mode ( cu )
// void part_mode ( cu )
// void cu_pred_data ( pus )
// void cu_lic_flag ( cu )
// void intra_luma_pred_modes ( pus )
// void intra_chroma_pred_mode ( pu )
// void cu_residual ( cu, partitioner, cuCtx )
// void rqt_root_cbf ( cu )
// void end_of_ctu ( cu, cuCtx )
//================================================================================
void CABACReader::coding_unit( CodingUnit &cu, Partitioner &partitioner, CUCtx& cuCtx )
{
CodingStructure& cs = *cu.cs;
CHECK( cu.treeType != partitioner.treeType || cu.modeType != partitioner.modeType, "treeType or modeType mismatch" );
DTRACE( g_trace_ctx, D_SYNTAX, "coding_unit() treeType=%d modeType=%d\n", cu.treeType, cu.modeType );
PredictionUnit& pu = cs.addPU(cu, partitioner.chType);
// skip flag
if ((!cs.slice->isIntra() || cs.slice->getSPS()->getIBCFlag()) && cu.Y().valid())
{
cu_skip_flag( cu );
}
// skip data
if( cu.skip )
{
cu.colorTransform = false;
cs.addEmptyTUs( partitioner );
MergeCtx mrgCtx;
prediction_unit ( pu, mrgCtx );
end_of_ctu( cu, cuCtx );
return;
}
// prediction mode and partitioning data
pred_mode ( cu );
if (CU::isIntra(cu))
{
adaptive_color_transform(cu);
}
if (CU::isPLT(cu))
{
cu.colorTransform = false;
cs.addTU(cu, partitioner.chType);
if (cu.isSepTree())
{
if (isLuma(partitioner.chType))
{
cu_palette_info(cu, COMPONENT_Y, 1, cuCtx);
}
if (cu.chromaFormat != CHROMA_400 && (partitioner.chType == CHANNEL_TYPE_CHROMA))
{
cu_palette_info(cu, COMPONENT_Cb, 2, cuCtx);
}
}
else
{
if( cu.chromaFormat != CHROMA_400 )
{
cu_palette_info(cu, COMPONENT_Y, 3, cuCtx);
}
else
{
cu_palette_info(cu, COMPONENT_Y, 1, cuCtx);
}
}
end_of_ctu(cu, cuCtx);
return;
}
// --> create PUs
// prediction data ( intra prediction modes / reference indexes + motion vectors )
cu_pred_data( cu );
// residual data ( coded block flags + transform coefficient levels )
cu_residual( cu, partitioner, cuCtx );
// check end of cu
end_of_ctu( cu, cuCtx );
}
void CABACReader::cu_skip_flag( CodingUnit& cu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__SKIP_FLAG );
if ((cu.slice->isIntra() || cu.isConsIntra()) && cu.cs->slice->getSPS()->getIBCFlag())
{
cu.skip = false;
cu.rootCbf = false;
cu.predMode = MODE_INTRA;
cu.mmvdSkip = false;
if (cu.lwidth() < 128 && cu.lheight() < 128) // disable IBC mode larger than 64x64
{
unsigned ctxId = DeriveCtx::CtxSkipFlag(cu);
unsigned skip = m_BinDecoder.decodeBin(Ctx::SkipFlag(ctxId));
DTRACE(g_trace_ctx, D_SYNTAX, "cu_skip_flag() ctx=%d skip=%d\n", ctxId, skip ? 1 : 0);
if (skip)
{
cu.skip = true;
cu.rootCbf = false;
cu.predMode = MODE_IBC;
cu.mmvdSkip = false;
}
}
return;
}
if ( !cu.cs->slice->getSPS()->getIBCFlag() && cu.lwidth() == 4 && cu.lheight() == 4 )
{
return;
}
if( !cu.cs->slice->getSPS()->getIBCFlag() && cu.isConsIntra() )
{
return;
}
unsigned ctxId = DeriveCtx::CtxSkipFlag(cu);
unsigned skip = m_BinDecoder.decodeBin( Ctx::SkipFlag(ctxId) );
DTRACE( g_trace_ctx, D_SYNTAX, "cu_skip_flag() ctx=%d skip=%d\n", ctxId, skip ? 1 : 0 );
if (skip && cu.cs->slice->getSPS()->getIBCFlag())
{
if (cu.lwidth() < 128 && cu.lheight() < 128 && !cu.isConsInter()) // disable IBC mode larger than 64x64 and disable IBC when only allowing inter mode
{
if ( cu.lwidth() == 4 && cu.lheight() == 4 )
{
cu.skip = true;
cu.rootCbf = false;
cu.predMode = MODE_IBC;
cu.mmvdSkip = false;
return;
}
unsigned ctxidx = DeriveCtx::CtxIBCFlag(cu);
if (m_BinDecoder.decodeBin(Ctx::IBCFlag(ctxidx)))
{
cu.skip = true;
cu.rootCbf = false;
cu.predMode = MODE_IBC;
cu.mmvdSkip = false;
cu.firstPU->regularMergeFlag = false;
}
else
{
cu.predMode = MODE_INTER;
}
DTRACE(g_trace_ctx, D_SYNTAX, "ibc() ctx=%d cu.predMode=%d\n", ctxidx, cu.predMode);
}
else
{
cu.predMode = MODE_INTER;
}
}
if ((skip && CU::isInter(cu) && cu.cs->slice->getSPS()->getIBCFlag()) ||
(skip && !cu.cs->slice->getSPS()->getIBCFlag()))
{
cu.skip = true;
cu.rootCbf = false;
cu.predMode = MODE_INTER;
}
}
void CABACReader::imv_mode( CodingUnit& cu, MergeCtx& mrgCtx )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__OTHER );
if( !cu.cs->sps->getAMVREnabledFlag() )
{
return;
}
bool bNonZeroMvd = CU::hasSubCUNonZeroMVd( cu );
if( !bNonZeroMvd )
{
return;
}
if ( cu.affine )
{
return;
}
const SPS *sps = cu.cs->sps;
unsigned value = 0;
if (CU::isIBC(cu))
{
value = 1;
}
else
{
value = m_BinDecoder.decodeBin(Ctx::ImvFlag(0));
}
DTRACE( g_trace_ctx, D_SYNTAX, "imv_mode() value=%d ctx=%d\n", value, 0 );
cu.imv = value;
if( sps->getAMVREnabledFlag() && value )
{
if (!CU::isIBC(cu))
{
value = m_BinDecoder.decodeBin(Ctx::ImvFlag(4));
DTRACE(g_trace_ctx, D_SYNTAX, "imv_mode() value=%d ctx=%d\n", value, 4);
cu.imv = value ? 1 : IMV_HPEL;
}
if (value)
{
value = m_BinDecoder.decodeBin(Ctx::ImvFlag(1));
DTRACE(g_trace_ctx, D_SYNTAX, "imv_mode() value=%d ctx=%d\n", value, 1);
value++;
cu.imv = value;
}
}
DTRACE( g_trace_ctx, D_SYNTAX, "imv_mode() IMVFlag=%d\n", cu.imv );
}
void CABACReader::affine_amvr_mode( CodingUnit& cu, MergeCtx& mrgCtx )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__OTHER );
const SPS* sps = cu.slice->getSPS();
if( !sps->getAffineAmvrEnabledFlag() || !cu.affine )
{
return;
}
if ( !CU::hasSubCUNonZeroAffineMVd( cu ) )
{
return;
}
unsigned value = 0;
value = m_BinDecoder.decodeBin( Ctx::ImvFlag( 2 ) );
DTRACE( g_trace_ctx, D_SYNTAX, "affine_amvr_mode() value=%d ctx=%d\n", value, 2 );
if( value )
{
value = m_BinDecoder.decodeBin( Ctx::ImvFlag( 3 ) );
DTRACE( g_trace_ctx, D_SYNTAX, "affine_amvr_mode() value=%d ctx=%d\n", value, 3 );
value++;
}
cu.imv = value;
DTRACE( g_trace_ctx, D_SYNTAX, "affine_amvr_mode() IMVFlag=%d\n", cu.imv );
}
void CABACReader::pred_mode( CodingUnit& cu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__PRED_MODE );
if (cu.cs->slice->getSPS()->getIBCFlag() && cu.chType != CHANNEL_TYPE_CHROMA)
{
if( cu.isConsInter() )
{
cu.predMode = MODE_INTER;
return;
}
if ( cu.cs->slice->isIntra() || ( cu.lwidth() == 4 && cu.lheight() == 4 ) || cu.isConsIntra() )
{
cu.predMode = MODE_INTRA;
if (cu.lwidth() < 128 && cu.lheight() < 128) // disable IBC mode larger than 64x64
{
unsigned ctxidx = DeriveCtx::CtxIBCFlag(cu);
if (m_BinDecoder.decodeBin(Ctx::IBCFlag(ctxidx)))
{
cu.predMode = MODE_IBC;
}
}
if (!CU::isIBC(cu) && cu.cs->slice->getSPS()->getPLTMode() && cu.lwidth() <= 64 && cu.lheight() <= 64 && (cu.lumaSize().width * cu.lumaSize().height > 16) )
{
if (m_BinDecoder.decodeBin(Ctx::PLTFlag(0)))
{
cu.predMode = MODE_PLT;
}
}
}
else
{
if (m_BinDecoder.decodeBin(Ctx::PredMode(DeriveCtx::CtxPredModeFlag(cu))))
{
cu.predMode = MODE_INTRA;
if (cu.cs->slice->getSPS()->getPLTMode() && cu.lwidth() <= 64 && cu.lheight() <= 64 && (cu.lumaSize().width * cu.lumaSize().height > 16) )
{
if (m_BinDecoder.decodeBin(Ctx::PLTFlag(0)))
{
cu.predMode = MODE_PLT;
}
}
}
else
{
cu.predMode = MODE_INTER;
if (cu.lwidth() < 128 && cu.lheight() < 128) // disable IBC mode larger than 64x64
{
unsigned ctxidx = DeriveCtx::CtxIBCFlag(cu);
if (m_BinDecoder.decodeBin(Ctx::IBCFlag(ctxidx)))
{
cu.predMode = MODE_IBC;
}
}
}
}
}
else
{
if( cu.isConsInter() )
{
cu.predMode = MODE_INTER;
return;
}
if ( cu.cs->slice->isIntra() || (cu.lwidth() == 4 && cu.lheight() == 4) || cu.isConsIntra() )
{
cu.predMode = MODE_INTRA;
if (cu.cs->slice->getSPS()->getPLTMode() && cu.lwidth() <= 64 && cu.lheight() <= 64 && ( ( (!isLuma(cu.chType)) && (cu.chromaSize().width * cu.chromaSize().height > 16) ) || ((isLuma(cu.chType)) && ((cu.lumaSize().width * cu.lumaSize().height) > 16 ) ) ) && (!cu.isLocalSepTree() || isLuma(cu.chType) ) )
{
if (m_BinDecoder.decodeBin(Ctx::PLTFlag(0)))
{
cu.predMode = MODE_PLT;
}
}
}
else
{
cu.predMode = m_BinDecoder.decodeBin(Ctx::PredMode(DeriveCtx::CtxPredModeFlag(cu))) ? MODE_INTRA : MODE_INTER;
if (CU::isIntra(cu) && cu.cs->slice->getSPS()->getPLTMode() && cu.lwidth() <= 64 && ( ( (!isLuma(cu.chType)) && (cu.chromaSize().width * cu.chromaSize().height > 16) ) || ((isLuma(cu.chType)) && ((cu.lumaSize().width * cu.lumaSize().height) > 16 ) ) ) && (!cu.isLocalSepTree() || isLuma(cu.chType) ) )
{
if (m_BinDecoder.decodeBin(Ctx::PLTFlag(0)))
{
cu.predMode = MODE_PLT;
}
}
}
}
}
void CABACReader::bdpcm_mode( CodingUnit& cu, const ComponentID compID )
{
if (!CU::bdpcmAllowed(cu, compID))
{
if (isLuma(compID))
{
cu.bdpcmMode = 0;
if (!CS::isDualITree(*cu.cs))
{
cu.bdpcmModeChroma = 0;
}
}
else
{
cu.bdpcmModeChroma = 0;
}
return;
}
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__BDPCM_MODE, cu.block(compID).lumaSize(), compID );
int bdpcmMode;
unsigned ctxId = isLuma( compID ) ? 0 : 2;
bdpcmMode = m_BinDecoder.decodeBin( Ctx::BDPCMMode(ctxId) );
if (bdpcmMode)
{
bdpcmMode += m_BinDecoder.decodeBin( Ctx::BDPCMMode(ctxId+1) );
}
if (isLuma(compID))
{
cu.bdpcmMode = bdpcmMode;
}
else
{
cu.bdpcmModeChroma = bdpcmMode;
}
if (isLuma(compID))
{
DTRACE(g_trace_ctx, D_SYNTAX, "bdpcm_mode(%d) x=%d, y=%d, w=%d, h=%d, bdpcm=%d\n", CHANNEL_TYPE_LUMA, cu.lumaPos().x, cu.lumaPos().y, cu.lwidth(), cu.lheight(), cu.bdpcmMode);
}
else
{
DTRACE(g_trace_ctx, D_SYNTAX, "bdpcm_mode(%d) x=%d, y=%d, w=%d, h=%d, bdpcm=%d\n", CHANNEL_TYPE_CHROMA, cu.chromaPos().x, cu.chromaPos().y, cu.chromaSize().width, cu.chromaSize().height, cu.bdpcmModeChroma);
}
}
void CABACReader::cu_pred_data( CodingUnit &cu )
{
if( CU::isIntra( cu ) )
{
if( cu.Y().valid() )
{
bdpcm_mode(cu, COMPONENT_Y );
}
intra_luma_pred_modes( cu );
if( ( !cu.Y().valid() || (!cu.isSepTree() && cu.Y().valid() ) ) && isChromaEnabled(cu.chromaFormat) )
{
bdpcm_mode(cu, ComponentID(CHANNEL_TYPE_CHROMA));
}
intra_chroma_pred_modes( cu );
return;
}
if (!cu.Y().valid()) // dual tree chroma CU
{
cu.predMode = MODE_IBC;
return;
}
MergeCtx mrgCtx;
for( auto &pu : CU::traversePUs( cu ) )
{
prediction_unit( pu, mrgCtx );
}
imv_mode ( cu, mrgCtx );
affine_amvr_mode( cu, mrgCtx );
cu_bcw_flag( cu );
}
void CABACReader::cu_bcw_flag(CodingUnit& cu)
{
if(!CU::isBcwIdxCoded(cu))
{
return;
}
CHECK(!(BCW_NUM > 1 && (BCW_NUM == 2 || (BCW_NUM & 0x01) == 1)), " !( BCW_NUM > 1 && ( BCW_NUM == 2 || ( BCW_NUM & 0x01 ) == 1 ) ) ");
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(STATS__CABAC_BITS__BCW_IDX);
uint32_t idx = 0;
uint32_t symbol = m_BinDecoder.decodeBin(Ctx::BcwIdx(0));
int32_t numBcw = (cu.slice->getCheckLDC()) ? 5 : 3;
if(symbol == 1)
{
uint32_t prefixNumBits = numBcw - 2;
uint32_t step = 1;
idx = 1;
for(int ui = 0; ui < prefixNumBits; ++ui)
{
symbol = m_BinDecoder.decodeBinEP();
if (symbol == 0)
{
break;
}
idx += step;
}
}
uint8_t bcwIdx = (uint8_t)g_BcwParsingOrder[idx];
CU::setBcwIdx(cu, bcwIdx);
DTRACE(g_trace_ctx, D_SYNTAX, "cu_bcw_flag() bcw_idx=%d\n", cu.BcwIdx ? 1 : 0);
}
void CABACReader::xReadTruncBinCode(uint32_t& symbol, uint32_t maxSymbol)
{
int thresh;
if (maxSymbol > 256)
{
int threshVal = 1 << 8;
thresh = 8;
while (threshVal <= maxSymbol)
{
thresh++;
threshVal <<= 1;
}
thresh--;
}
else
{
thresh = g_tbMax[maxSymbol];
}
int val = 1 << thresh;
int b = maxSymbol - val;
symbol = m_BinDecoder.decodeBinsEP(thresh);
if (symbol >= val - b)
{
uint32_t altSymbol;
altSymbol = m_BinDecoder.decodeBinEP();
symbol <<= 1;
symbol += altSymbol;
symbol -= (val - b);
}
}
void CABACReader::extend_ref_line(CodingUnit& cu)
{
if ( !cu.Y().valid() || cu.predMode != MODE_INTRA || !isLuma(cu.chType) || cu.bdpcmMode )
{
cu.firstPU->multiRefIdx = 0;
return;
}
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(STATS__CABAC_BITS__MULTI_REF_LINE);
const int numBlocks = CU::getNumPUs(cu);
PredictionUnit* pu = cu.firstPU;
for (int k = 0; k < numBlocks; k++)
{
if( !cu.cs->sps->getUseMRL() )
{
pu->multiRefIdx = 0;
pu = pu->next;
continue;
}
bool isFirstLineOfCtu = (((cu.block(COMPONENT_Y).y)&((cu.cs->sps)->getMaxCUWidth() - 1)) == 0);
if (isFirstLineOfCtu)
{
pu->multiRefIdx = 0;
continue;
}
int multiRefIdx = 0;
if (MRL_NUM_REF_LINES > 1)
{
multiRefIdx = m_BinDecoder.decodeBin(Ctx::MultiRefLineIdx(0)) == 1 ? MULTI_REF_LINE_IDX[1] : MULTI_REF_LINE_IDX[0];
if (MRL_NUM_REF_LINES > 2 && multiRefIdx != MULTI_REF_LINE_IDX[0])
{
multiRefIdx = m_BinDecoder.decodeBin(Ctx::MultiRefLineIdx(1)) == 1 ? MULTI_REF_LINE_IDX[2] : MULTI_REF_LINE_IDX[1];
}
}
pu->multiRefIdx = multiRefIdx;
pu = pu->next;
}
}
void CABACReader::intra_luma_pred_modes( CodingUnit &cu )
{
if( !cu.Y().valid() )
{
return;
}
if( cu.bdpcmMode )
{
cu.firstPU->intraDir[0] = cu.bdpcmMode == 2? VER_IDX : HOR_IDX;
return;
}
mip_flag(cu);
if (cu.mipFlag)
{
mip_pred_modes(cu);
return;
}
extend_ref_line( cu );
isp_mode( cu );
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__INTRA_DIR_ANG, cu.lumaSize(), CHANNEL_TYPE_LUMA );
// prev_intra_luma_pred_flag
int numBlocks = CU::getNumPUs( cu );
int mpmFlag[4];
for( int k = 0; k < numBlocks; k++ )
{
CHECK(numBlocks != 1, "not supported yet");
if ( cu.firstPU->multiRefIdx )
{
mpmFlag[0] = true;
}
else
{
mpmFlag[k] = m_BinDecoder.decodeBin(Ctx::IntraLumaMpmFlag());
}
}
PredictionUnit *pu = cu.firstPU;
unsigned mpm_pred[NUM_MOST_PROBABLE_MODES]; // mpm_idx / rem_intra_luma_pred_mode
for( int k = 0; k < numBlocks; k++ )
{
PU::getIntraMPMs( *pu, mpm_pred );
if( mpmFlag[k] )
{
uint32_t ipred_idx = 0;
{
unsigned ctx = (pu->cu->ispMode == NOT_INTRA_SUBPARTITIONS ? 1 : 0);
if (pu->multiRefIdx == 0)
{
ipred_idx = m_BinDecoder.decodeBin(Ctx::IntraLumaPlanarFlag(ctx));
}
else
{
ipred_idx = 1;
}
if( ipred_idx )
{
ipred_idx += m_BinDecoder.decodeBinEP();
}
if (ipred_idx > 1)
{
ipred_idx += m_BinDecoder.decodeBinEP();
}
if (ipred_idx > 2)
{
ipred_idx += m_BinDecoder.decodeBinEP();
}
if (ipred_idx > 3)
{
ipred_idx += m_BinDecoder.decodeBinEP();
}
}
pu->intraDir[0] = mpm_pred[ipred_idx];
}
else
{
unsigned ipred_mode = 0;
xReadTruncBinCode(ipred_mode, NUM_LUMA_MODE - NUM_MOST_PROBABLE_MODES);
//postponed sorting of MPMs (only in remaining branch)
std::sort( mpm_pred, mpm_pred + NUM_MOST_PROBABLE_MODES );
for( uint32_t i = 0; i < NUM_MOST_PROBABLE_MODES; i++ )
{
ipred_mode += (ipred_mode >= mpm_pred[i]);
}
pu->intraDir[0] = ipred_mode;
}
DTRACE( g_trace_ctx, D_SYNTAX, "intra_luma_pred_modes() idx=%d pos=(%d,%d) mode=%d\n", k, pu->lumaPos().x, pu->lumaPos().y, pu->intraDir[0] );
pu = pu->next;
}
}
void CABACReader::intra_chroma_pred_modes( CodingUnit& cu )
{
if( cu.chromaFormat == CHROMA_400 || ( cu.isSepTree() && cu.chType == CHANNEL_TYPE_LUMA ) )
{
return;
}
if( cu.bdpcmModeChroma )
{
cu.firstPU->intraDir[1] = cu.bdpcmModeChroma == 2 ? VER_IDX : HOR_IDX;
return;
}
PredictionUnit *pu = cu.firstPU;
CHECK(pu->cu != &cu, "Inkonsistent PU-CU mapping");
intra_chroma_pred_mode(*pu);
}
bool CABACReader::intra_chroma_lmc_mode(PredictionUnit& pu)
{
int lmModeList[10];
PU::getLMSymbolList(pu, lmModeList);
int symbol = m_BinDecoder.decodeBin(Ctx::CclmModeIdx(0));
if (symbol == 0)
{
pu.intraDir[1] = lmModeList[symbol];
CHECK(pu.intraDir[1] != LM_CHROMA_IDX, "should be LM_CHROMA");
}
else
{
symbol += m_BinDecoder.decodeBinEP();
pu.intraDir[1] = lmModeList[symbol];
}
return true; //it will only enter this function for LMC modes, so always return true ;
}
void CABACReader::intra_chroma_pred_mode(PredictionUnit& pu)
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2(STATS__CABAC_BITS__INTRA_DIR_ANG, pu.cu->blocks[pu.chType].lumaSize(), CHANNEL_TYPE_CHROMA);
if (pu.cu->colorTransform)
{
pu.intraDir[CHANNEL_TYPE_CHROMA] = DM_CHROMA_IDX;
return;
}
// LM chroma mode
if (pu.cs->sps->getUseLMChroma() && pu.cu->checkCCLMAllowed())
{
bool isLMCMode = m_BinDecoder.decodeBin(Ctx::CclmModeFlag(0)) ? true : false;
if (isLMCMode)
{
intra_chroma_lmc_mode(pu);
return;
}
}
if (m_BinDecoder.decodeBin(Ctx::IntraChromaPredMode(0)) == 0)
{
pu.intraDir[1] = DM_CHROMA_IDX;
return;
}
unsigned candId = m_BinDecoder.decodeBinsEP(2);
unsigned chromaCandModes[NUM_CHROMA_MODE];
PU::getIntraChromaCandModes(pu, chromaCandModes);
CHECK(candId >= NUM_CHROMA_MODE, "Chroma prediction mode index out of bounds");
CHECK(PU::isLMCMode(chromaCandModes[candId]), "The intra dir cannot be LM_CHROMA for this path");
CHECK(chromaCandModes[candId] == DM_CHROMA_IDX, "The intra dir cannot be DM_CHROMA for this path");
pu.intraDir[1] = chromaCandModes[candId];
}
void CABACReader::cu_residual( CodingUnit& cu, Partitioner &partitioner, CUCtx& cuCtx )
{
if (!CU::isIntra(cu))
{
PredictionUnit& pu = *cu.firstPU;
if( !pu.mergeFlag )
{
rqt_root_cbf( cu );
}
else
{
cu.rootCbf = true;
}
if( cu.rootCbf )
{
sbt_mode( cu );
}
if( !cu.rootCbf )
{
cu.colorTransform = false;
cu.cs->addEmptyTUs( partitioner );
return;
}
}
if (CU::isInter(cu) || CU::isIBC(cu))
{
adaptive_color_transform(cu);
}
cuCtx.violatesLfnstConstrained[CHANNEL_TYPE_LUMA] = false;
cuCtx.violatesLfnstConstrained[CHANNEL_TYPE_CHROMA] = false;
cuCtx.lfnstLastScanPos = false;
cuCtx.violatesMtsCoeffConstraint = false;
cuCtx.mtsLastScanPos = false;
ChromaCbfs chromaCbfs;
if( cu.ispMode && isLuma( partitioner.chType ) )
{
TUIntraSubPartitioner subTuPartitioner( partitioner );
transform_tree( *cu.cs, subTuPartitioner, cuCtx, CU::getISPType(cu, getFirstComponentOfChannel(partitioner.chType)), 0 );
}
else
{
transform_tree( *cu.cs, partitioner, cuCtx );
}
residual_lfnst_mode( cu, cuCtx );
mts_idx ( cu, cuCtx );
}
void CABACReader::rqt_root_cbf( CodingUnit& cu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__QT_ROOT_CBF );
cu.rootCbf = ( m_BinDecoder.decodeBin( Ctx::QtRootCbf() ) );
DTRACE( g_trace_ctx, D_SYNTAX, "rqt_root_cbf() ctx=0 root_cbf=%d pos=(%d,%d)\n", cu.rootCbf ? 1 : 0, cu.lumaPos().x, cu.lumaPos().y );
}
void CABACReader::adaptive_color_transform(CodingUnit& cu)
{
if (!cu.slice->getSPS()->getUseColorTrans())
{
return;
}
if (cu.isSepTree())
{
return;
}
if (CU::isInter(cu) || CU::isIBC(cu) || CU::isIntra(cu))
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__ACT );
cu.colorTransform = (m_BinDecoder.decodeBin(Ctx::ACTFlag()));
}
}
void CABACReader::sbt_mode( CodingUnit& cu )
{
const uint8_t sbtAllowed = cu.checkAllowedSbt();
if( !sbtAllowed )
{
return;
}
SizeType cuWidth = cu.lwidth();
SizeType cuHeight = cu.lheight();
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__SBT_MODE );
//bin - flag
uint8_t ctxIdx = ( cuWidth * cuHeight <= 256 ) ? 1 : 0;
bool sbtFlag = m_BinDecoder.decodeBin( Ctx::SbtFlag( ctxIdx ) );
if( !sbtFlag )
{
return;
}
uint8_t sbtVerHalfAllow = CU::targetSbtAllowed( SBT_VER_HALF, sbtAllowed );
uint8_t sbtHorHalfAllow = CU::targetSbtAllowed( SBT_HOR_HALF, sbtAllowed );
uint8_t sbtVerQuadAllow = CU::targetSbtAllowed( SBT_VER_QUAD, sbtAllowed );
uint8_t sbtHorQuadAllow = CU::targetSbtAllowed( SBT_HOR_QUAD, sbtAllowed );
//bin - type
bool sbtQuadFlag = false;
if( ( sbtHorHalfAllow || sbtVerHalfAllow ) && ( sbtHorQuadAllow || sbtVerQuadAllow ) )
{
sbtQuadFlag = m_BinDecoder.decodeBin( Ctx::SbtQuadFlag( 0 ) );
}
else
{
sbtQuadFlag = 0;
}
//bin - dir
bool sbtHorFlag = false;
if( ( sbtQuadFlag && sbtVerQuadAllow && sbtHorQuadAllow ) || ( !sbtQuadFlag && sbtVerHalfAllow && sbtHorHalfAllow ) ) //both direction allowed
{
uint8_t ctxIdx = ( cuWidth == cuHeight ) ? 0 : ( cuWidth < cuHeight ? 1 : 2 );
sbtHorFlag = m_BinDecoder.decodeBin( Ctx::SbtHorFlag( ctxIdx ) );
}
else
{
sbtHorFlag = ( sbtQuadFlag && sbtHorQuadAllow ) || ( !sbtQuadFlag && sbtHorHalfAllow );
}
cu.setSbtIdx( sbtHorFlag ? ( sbtQuadFlag ? SBT_HOR_QUAD : SBT_HOR_HALF ) : ( sbtQuadFlag ? SBT_VER_QUAD : SBT_VER_HALF ) );
//bin - pos
bool sbtPosFlag = m_BinDecoder.decodeBin( Ctx::SbtPosFlag( 0 ) );
cu.setSbtPos( sbtPosFlag ? SBT_POS1 : SBT_POS0 );
DTRACE( g_trace_ctx, D_SYNTAX, "sbt_mode() pos=(%d,%d) sbtInfo=%d\n", cu.lx(), cu.ly(), (int)cu.sbtInfo );
}
void CABACReader::end_of_ctu( CodingUnit& cu, CUCtx& cuCtx )
{
const Position rbPos = recalcPosition( cu.chromaFormat, cu.chType, CHANNEL_TYPE_LUMA, cu.blocks[cu.chType].bottomRight().offset( 1, 1 ) );
if (((rbPos.x & cu.cs->pcv->maxCUWidthMask) == 0 || rbPos.x == cu.cs->pps->getPicWidthInLumaSamples())
&& ((rbPos.y & cu.cs->pcv->maxCUHeightMask) == 0 || rbPos.y == cu.cs->pps->getPicHeightInLumaSamples())
&& (!cu.isSepTree() || cu.chromaFormat == CHROMA_400 || isChroma(cu.chType)))
{
cuCtx.isDQPCoded = ( cu.cs->pps->getUseDQP() && !cuCtx.isDQPCoded );
}
}
void CABACReader::cu_palette_info(CodingUnit& cu, ComponentID compBegin, uint32_t numComp, CUCtx& cuCtx)
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__PLT_MODE );
const SPS& sps = *(cu.cs->sps);
TransformUnit& tu = *cu.firstTU;
int curPLTidx = 0;
if( cu.isLocalSepTree() )
cu.cs->prevPLT.curPLTSize[compBegin] = cu.cs->prevPLT.curPLTSize[COMPONENT_Y];
cu.lastPLTSize[compBegin] = cu.cs->prevPLT.curPLTSize[compBegin];
int maxPltSize = cu.isSepTree() ? MAXPLTSIZE_DUALTREE : MAXPLTSIZE;
if (cu.lastPLTSize[compBegin])
{
xDecodePLTPredIndicator(cu, maxPltSize, compBegin);
}
for (int idx = 0; idx < cu.lastPLTSize[compBegin]; idx++)
{
if (cu.reuseflag[compBegin][idx])
{
if( cu.isLocalSepTree() )
{
for( int comp = COMPONENT_Y; comp < MAX_NUM_COMPONENT; comp++ )
{
cu.curPLT[comp][curPLTidx] = cu.cs->prevPLT.curPLT[comp][idx];
}
}
else
{
for (int comp = compBegin; comp < (compBegin + numComp); comp++)
{
cu.curPLT[comp][curPLTidx] = cu.cs->prevPLT.curPLT[comp][idx];
}
}
curPLTidx++;
}
}
uint32_t recievedPLTnum = 0;
if (curPLTidx < maxPltSize)
{
recievedPLTnum = exp_golomb_eqprob(0);
}
cu.curPLTSize[compBegin] = curPLTidx + recievedPLTnum;
if( cu.isLocalSepTree() )
cu.curPLTSize[COMPONENT_Y] = cu.curPLTSize[compBegin];
for (int comp = compBegin; comp < (compBegin + numComp); comp++)
{
for (int idx = curPLTidx; idx < cu.curPLTSize[compBegin]; idx++)
{
ComponentID compID = (ComponentID)comp;
const int channelBitDepth = sps.getBitDepth(toChannelType(compID));
cu.curPLT[compID][idx] = m_BinDecoder.decodeBinsEP(channelBitDepth);
if( cu.isLocalSepTree() )
{
if( isLuma( cu.chType ) )
{
cu.curPLT[COMPONENT_Cb][idx] = 1 << (cu.cs->sps->getBitDepth(CHANNEL_TYPE_CHROMA) - 1);
cu.curPLT[COMPONENT_Cr][idx] = 1 << (cu.cs->sps->getBitDepth(CHANNEL_TYPE_CHROMA) - 1);
}
else
{
cu.curPLT[COMPONENT_Y][idx] = 1 << (cu.cs->sps->getBitDepth(CHANNEL_TYPE_LUMA) - 1);
}
}
}
}
cu.useEscape[compBegin] = true;
if (cu.curPLTSize[compBegin] > 0)
{
uint32_t escCode = 0;
escCode = m_BinDecoder.decodeBinEP();
cu.useEscape[compBegin] = (escCode != 0);
}
uint32_t indexMaxSize = cu.useEscape[compBegin] ? (cu.curPLTSize[compBegin] + 1) : cu.curPLTSize[compBegin];
//encode index map
uint32_t height = cu.block(compBegin).height;
uint32_t width = cu.block(compBegin).width;
uint32_t total = height * width;
if (indexMaxSize > 1)
{
parseScanRotationModeFlag(cu, compBegin);
}
else
{
cu.useRotation[compBegin] = false;
}
if (cu.useEscape[compBegin] && cu.cs->pps->getUseDQP() && !cuCtx.isDQPCoded)
{
if (!cu.isSepTree() || isLuma(tu.chType))
{
cu_qp_delta(cu, cuCtx.qp, cu.qp);
cuCtx.qp = cu.qp;
cuCtx.isDQPCoded = true;
}
}
if (cu.useEscape[compBegin] && cu.cs->slice->getUseChromaQpAdj() && !cuCtx.isChromaQpAdjCoded)
{
if (!cu.isSepTree() || isChroma(tu.chType))
{
cu_chroma_qp_offset(cu);
cuCtx.isChromaQpAdjCoded = true;
}
}
m_scanOrder = g_scanOrder[SCAN_UNGROUPED][(cu.useRotation[compBegin]) ? SCAN_TRAV_VER : SCAN_TRAV_HOR][gp_sizeIdxInfo->idxFrom(width)][gp_sizeIdxInfo->idxFrom(height)];
uint32_t prevRunPos = 0;
unsigned prevRunType = 0;
for (int subSetId = 0; subSetId <= (total - 1) >> LOG2_PALETTE_CG_SIZE; subSetId++)
{
cuPaletteSubblockInfo(cu, compBegin, numComp, subSetId, prevRunPos, prevRunType);
}
CHECK(cu.curPLTSize[compBegin] > maxPltSize, " Current palette size is larger than maximum palette size");
}
void CABACReader::cuPaletteSubblockInfo(CodingUnit& cu, ComponentID compBegin, uint32_t numComp, int subSetId, uint32_t& prevRunPos, unsigned& prevRunType)
{
const SPS& sps = *(cu.cs->sps);
TransformUnit& tu = *cu.firstTU;
PLTtypeBuf runType = tu.getrunType(compBegin);
PelBuf curPLTIdx = tu.getcurPLTIdx(compBegin);
uint32_t indexMaxSize = cu.useEscape[compBegin] ? (cu.curPLTSize[compBegin] + 1) : cu.curPLTSize[compBegin];
uint32_t totalPel = cu.block(compBegin).height*cu.block(compBegin).width;
int minSubPos = subSetId << LOG2_PALETTE_CG_SIZE;
int maxSubPos = minSubPos + (1 << LOG2_PALETTE_CG_SIZE);
maxSubPos = (maxSubPos > totalPel) ? totalPel : maxSubPos; // if last position is out of the current CU size
unsigned runCopyFlag[(1 << LOG2_PALETTE_CG_SIZE)];
for (int i = 0; i < (1 << LOG2_PALETTE_CG_SIZE); i++)
{
runCopyFlag[i] = MAX_INT;
}
if (minSubPos == 0)
{
runCopyFlag[0] = 0;
}
// PLT runCopy flag and runType - context coded
int curPos = minSubPos;
for (; curPos < maxSubPos && indexMaxSize > 1; curPos++)
{
uint32_t posy = m_scanOrder[curPos].y;
uint32_t posx = m_scanOrder[curPos].x;
uint32_t posyprev = (curPos == 0) ? 0 : m_scanOrder[curPos - 1].y;
uint32_t posxprev = (curPos == 0) ? 0 : m_scanOrder[curPos - 1].x;
unsigned identityFlag = 1;
const CtxSet& ctxSet = (prevRunType == PLT_RUN_INDEX) ? Ctx::IdxRunModel : Ctx::CopyRunModel;
if (curPos > 0)
{
int dist = curPos - prevRunPos - 1;
const unsigned ctxId = DeriveCtx::CtxPltCopyFlag(prevRunType, dist);
identityFlag = m_BinDecoder.decodeBin( ctxSet( ctxId ) );
DTRACE(g_trace_ctx, D_SYNTAX, "plt_copy_flag() bin=%d ctx=%d\n", identityFlag, ctxId);
runCopyFlag[curPos - minSubPos] = identityFlag;
}
if ( identityFlag == 0 || curPos == 0 )
{
if (((posy == 0) && !cu.useRotation[compBegin]) || ((posx == 0) && cu.useRotation[compBegin]))
{
runType.at(posx, posy) = PLT_RUN_INDEX;
}
else if (curPos != 0 && runType.at(posxprev, posyprev) == PLT_RUN_COPY)
{
runType.at(posx, posy) = PLT_RUN_INDEX;
}
else
{
runType.at(posx, posy) = (m_BinDecoder.decodeBin(Ctx::RunTypeFlag()));
}
DTRACE(g_trace_ctx, D_SYNTAX, "plt_type_flag() bin=%d sp=%d\n", runType.at(posx, posy), curPos);
prevRunType = runType.at(posx, posy);
prevRunPos = curPos;
}
else //assign run information
{
runType.at(posx, posy) = runType.at(posxprev, posyprev);
}
}
// PLT index values - bypass coded
uint32_t adjust;
uint32_t symbol = 0;
curPos = minSubPos;
if (indexMaxSize > 1)
{
for (; curPos < maxSubPos; curPos++)
{
if (curPos > 0)
{
adjust = 1;
}
else
{
adjust = 0;
}
uint32_t posy = m_scanOrder[curPos].y;
uint32_t posx = m_scanOrder[curPos].x;
uint32_t posyprev = (curPos == 0) ? 0 : m_scanOrder[curPos - 1].y;
uint32_t posxprev = (curPos == 0) ? 0 : m_scanOrder[curPos - 1].x;
if ( runCopyFlag[curPos - minSubPos] == 0 && runType.at(posx, posy) == PLT_RUN_INDEX )
{
xReadTruncBinCode(symbol, indexMaxSize - adjust);
xAdjustPLTIndex(cu, symbol, curPos, curPLTIdx, runType, indexMaxSize, compBegin);
DTRACE(g_trace_ctx, D_SYNTAX, "plt_idx_idc() value=%d sp=%d\n", curPLTIdx.at(posx, posy), curPos);
}
else if (runType.at(posx, posy) == PLT_RUN_INDEX)
{
curPLTIdx.at(posx, posy) = curPLTIdx.at(posxprev, posyprev);
}
else
{
curPLTIdx.at(posx, posy) = (cu.useRotation[compBegin]) ? curPLTIdx.at(posx - 1, posy) : curPLTIdx.at(posx, posy - 1);
}
}
}
else
{
for (; curPos < maxSubPos; curPos++)
{
uint32_t posy = m_scanOrder[curPos].y;
uint32_t posx = m_scanOrder[curPos].x;
uint32_t posyprev = (curPos == 0) ? 0 : m_scanOrder[curPos - 1].y;
uint32_t posxprev = (curPos == 0) ? 0 : m_scanOrder[curPos - 1].x;
runType.at(posx, posy) = PLT_RUN_INDEX;
if (runCopyFlag[curPos - minSubPos] == 0 && runType.at(posx, posy) == PLT_RUN_INDEX)
{
curPLTIdx.at(posx, posy) = 0;
}
else
{
curPLTIdx.at(posx, posy) = curPLTIdx.at(posxprev, posyprev);
}
}
}
// Quantized escape colors - bypass coded
uint32_t scaleX = getComponentScaleX(COMPONENT_Cb, sps.getChromaFormatIdc());
uint32_t scaleY = getComponentScaleY(COMPONENT_Cb, sps.getChromaFormatIdc());
for (int comp = compBegin; comp < (compBegin + numComp); comp++)
{
ComponentID compID = (ComponentID)comp;
for (curPos = minSubPos; curPos < maxSubPos; curPos++)
{
uint32_t posy = m_scanOrder[curPos].y;
uint32_t posx = m_scanOrder[curPos].x;
if (curPLTIdx.at(posx, posy) == cu.curPLTSize[compBegin])
{
PLTescapeBuf escapeValue = tu.getescapeValue((ComponentID)comp);
if (compID == COMPONENT_Y || compBegin != COMPONENT_Y)
{
escapeValue.at(posx, posy) = exp_golomb_eqprob(5);
assert(escapeValue.at(posx, posy) < (TCoeff(1) << (cu.cs->sps->getBitDepth(toChannelType((ComponentID)comp)) + 1)));
DTRACE(g_trace_ctx, D_SYNTAX, "plt_escape_val() value=%d etype=%d sp=%d\n", escapeValue.at(posx, posy), comp, curPos);
}
if (compBegin == COMPONENT_Y && compID != COMPONENT_Y && posy % (1 << scaleY) == 0 && posx % (1 << scaleX) == 0)
{
uint32_t posxC = posx >> scaleX;
uint32_t posyC = posy >> scaleY;
escapeValue.at(posxC, posyC) = exp_golomb_eqprob(5);
assert(escapeValue.at(posxC, posyC) < (TCoeff(1) << (cu.cs->sps->getBitDepth(toChannelType(compID)) + 1)));
DTRACE(g_trace_ctx, D_SYNTAX, "plt_escape_val() value=%d etype=%d sp=%d\n", escapeValue.at(posx, posy), comp, curPos);
}
}
}
}
}
void CABACReader::parseScanRotationModeFlag(CodingUnit& cu, ComponentID compBegin)
{
cu.useRotation[compBegin] = m_BinDecoder.decodeBin(Ctx::RotationFlag());
}
void CABACReader::xDecodePLTPredIndicator(CodingUnit& cu, uint32_t maxPLTSize, ComponentID compBegin)
{
uint32_t symbol, numPltPredicted = 0, idx = 0;
symbol = exp_golomb_eqprob(0);
if (symbol != 1)
{
while (idx < cu.lastPLTSize[compBegin] && numPltPredicted < maxPLTSize)
{
if (idx > 0)
{
symbol = exp_golomb_eqprob(0);
}
if (symbol == 1)
{
break;
}
if (symbol)
{
idx += symbol - 1;
}
cu.reuseflag[compBegin][idx] = 1;
if( cu.isLocalSepTree() )
{
cu.reuseflag[COMPONENT_Y][idx] = 1;
}
numPltPredicted++;
idx++;
}
}
}
void CABACReader::xAdjustPLTIndex(CodingUnit& cu, Pel curLevel, uint32_t idx, PelBuf& paletteIdx, PLTtypeBuf& paletteRunType, int maxSymbol, ComponentID compBegin)
{
uint32_t symbol;
int refLevel = MAX_INT;
uint32_t posy = m_scanOrder[idx].y;
uint32_t posx = m_scanOrder[idx].x;
if (idx)
{
uint32_t prevposy = m_scanOrder[idx - 1].y;
uint32_t prevposx = m_scanOrder[idx - 1].x;
if (paletteRunType.at(prevposx, prevposy) == PLT_RUN_INDEX)
{
refLevel = paletteIdx.at(prevposx, prevposy);
if (paletteIdx.at(prevposx, prevposy) == cu.curPLTSize[compBegin]) // escape
{
refLevel = maxSymbol - 1;
}
}
else
{
if (cu.useRotation[compBegin])
{
assert(prevposx > 0);
refLevel = paletteIdx.at(posx - 1, posy);
if (paletteIdx.at(posx - 1, posy) == cu.curPLTSize[compBegin]) // escape mode
{
refLevel = maxSymbol - 1;
}
}
else
{
assert(prevposy > 0);
refLevel = paletteIdx.at(posx, posy - 1);
if (paletteIdx.at(posx, posy - 1) == cu.curPLTSize[compBegin]) // escape mode
{
refLevel = maxSymbol - 1;
}
}
}
maxSymbol--;
}
symbol = curLevel;
if (curLevel >= refLevel) // include escape mode
{
symbol++;
}
paletteIdx.at(posx, posy) = symbol;
}
//================================================================================
// clause 7.3.8.6
//--------------------------------------------------------------------------------
// void prediction_unit ( pu, mrgCtx );
// void merge_flag ( pu );
// void merge_data ( pu, mrgCtx );
// void merge_idx ( pu );
// void inter_pred_idc ( pu );
// void ref_idx ( pu, refList );
// void mvp_flag ( pu, refList );
//================================================================================
void CABACReader::prediction_unit( PredictionUnit& pu, MergeCtx& mrgCtx )
{
if( pu.cu->skip )
{
pu.mergeFlag = true;
}
else
{
merge_flag( pu );
}
if( pu.mergeFlag )
{
merge_data(pu);
}
else if (CU::isIBC(*pu.cu))
{
pu.interDir = 1;
pu.cu->affine = false;
pu.refIdx[REF_PIC_LIST_0] = MAX_NUM_REF;
mvd_coding(pu.mvd[REF_PIC_LIST_0]);
if (pu.cs->sps->getMaxNumIBCMergeCand() == 1)
{
pu.mvpIdx[REF_PIC_LIST_0] = 0;
}
else
{
mvp_flag(pu, REF_PIC_LIST_0);
}
}
else
{
inter_pred_idc( pu );
affine_flag ( *pu.cu );
smvd_mode( pu );
if( pu.interDir != 2 /* PRED_L1 */ )
{
ref_idx ( pu, REF_PIC_LIST_0 );
if( pu.cu->affine )
{
mvd_coding( pu.mvdAffi[REF_PIC_LIST_0][0] );
mvd_coding( pu.mvdAffi[REF_PIC_LIST_0][1] );
if ( pu.cu->affineType == AFFINEMODEL_6PARAM )
{
mvd_coding( pu.mvdAffi[REF_PIC_LIST_0][2] );
}
}
else
{
mvd_coding( pu.mvd[REF_PIC_LIST_0] );
}
mvp_flag ( pu, REF_PIC_LIST_0 );
}
if( pu.interDir != 1 /* PRED_L0 */ )
{
if ( pu.cu->smvdMode != 1 )
{
ref_idx(pu, REF_PIC_LIST_1);
if (pu.cu->cs->picHeader->getMvdL1ZeroFlag() && pu.interDir == 3 /* PRED_BI */)
{
pu.mvd[REF_PIC_LIST_1] = Mv();
pu.mvdAffi[REF_PIC_LIST_1][0] = Mv();
pu.mvdAffi[REF_PIC_LIST_1][1] = Mv();
pu.mvdAffi[REF_PIC_LIST_1][2] = Mv();
}
else if (pu.cu->affine)
{
mvd_coding(pu.mvdAffi[REF_PIC_LIST_1][0]);
mvd_coding(pu.mvdAffi[REF_PIC_LIST_1][1]);
if (pu.cu->affineType == AFFINEMODEL_6PARAM)
{
mvd_coding(pu.mvdAffi[REF_PIC_LIST_1][2]);
}
}
else
{
mvd_coding(pu.mvd[REF_PIC_LIST_1]);
}
}
mvp_flag ( pu, REF_PIC_LIST_1 );
}
}
if( pu.interDir == 3 /* PRED_BI */ && PU::isBipredRestriction(pu) )
{
pu.mv [REF_PIC_LIST_1] = Mv(0, 0);
pu.refIdx[REF_PIC_LIST_1] = -1;
pu.interDir = 1;
pu.cu->BcwIdx = BCW_DEFAULT;
}
if ( pu.cu->smvdMode )
{
RefPicList eCurRefList = (RefPicList)(pu.cu->smvdMode - 1);
pu.mvd[1 - eCurRefList].set( -pu.mvd[eCurRefList].hor, -pu.mvd[eCurRefList].ver );
CHECK(!((pu.mvd[1 - eCurRefList].getHor() >= MVD_MIN) && (pu.mvd[1 - eCurRefList].getHor() <= MVD_MAX)) || !((pu.mvd[1 - eCurRefList].getVer() >= MVD_MIN) && (pu.mvd[1 - eCurRefList].getVer() <= MVD_MAX)), "Illegal MVD value");
pu.refIdx[1 - eCurRefList] = pu.cs->slice->getSymRefIdx( 1 - eCurRefList );
}
}
void CABACReader::smvd_mode( PredictionUnit& pu )
{
pu.cu->smvdMode = 0;
if ( pu.interDir != 3 || pu.cu->affine )
{
return;
}
if ( pu.cs->slice->getBiDirPred() == false )
{
return;
}
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__SYMMVD_FLAG );
pu.cu->smvdMode = m_BinDecoder.decodeBin( Ctx::SmvdFlag() ) ? 1 : 0;
DTRACE( g_trace_ctx, D_SYNTAX, "symmvd_flag() symmvd=%d pos=(%d,%d) size=%dx%d\n", pu.cu->smvdMode ? 1 : 0, pu.lumaPos().x, pu.lumaPos().y, pu.lumaSize().width, pu.lumaSize().height );
}
void CABACReader::subblock_merge_flag( CodingUnit& cu )
{
cu.affine = false;
if ( !cu.cs->slice->isIntra() && (cu.slice->getPicHeader()->getMaxNumAffineMergeCand() > 0) && cu.lumaSize().width >= 8 && cu.lumaSize().height >= 8 )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__AFFINE_FLAG );
unsigned ctxId = DeriveCtx::CtxAffineFlag( cu );
cu.affine = m_BinDecoder.decodeBin( Ctx::SubblockMergeFlag( ctxId ) );
DTRACE( g_trace_ctx, D_SYNTAX, "subblock_merge_flag() subblock_merge_flag=%d ctx=%d pos=(%d,%d)\n", cu.affine ? 1 : 0, ctxId, cu.Y().x, cu.Y().y );
}
}
void CABACReader::affine_flag( CodingUnit& cu )
{
if ( !cu.cs->slice->isIntra() && cu.cs->sps->getUseAffine() && cu.lumaSize().width > 8 && cu.lumaSize().height > 8 )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__AFFINE_FLAG );
unsigned ctxId = DeriveCtx::CtxAffineFlag( cu );
cu.affine = m_BinDecoder.decodeBin( Ctx::AffineFlag( ctxId ) );
DTRACE( g_trace_ctx, D_SYNTAX, "affine_flag() affine=%d ctx=%d pos=(%d,%d)\n", cu.affine ? 1 : 0, ctxId, cu.Y().x, cu.Y().y );
if ( cu.affine && cu.cs->sps->getUseAffineType() )
{
ctxId = 0;
cu.affineType = m_BinDecoder.decodeBin( Ctx::AffineType( ctxId ) );
DTRACE( g_trace_ctx, D_SYNTAX, "affine_type() affine_type=%d ctx=%d pos=(%d,%d)\n", cu.affineType ? 1 : 0, ctxId, cu.Y().x, cu.Y().y );
}
else
{
cu.affineType = AFFINEMODEL_4PARAM;
}
}
}
void CABACReader::merge_flag( PredictionUnit& pu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__MERGE_FLAG );
pu.mergeFlag = ( m_BinDecoder.decodeBin( Ctx::MergeFlag() ) );
DTRACE( g_trace_ctx, D_SYNTAX, "merge_flag() merge=%d pos=(%d,%d) size=%dx%d\n", pu.mergeFlag ? 1 : 0, pu.lumaPos().x, pu.lumaPos().y, pu.lumaSize().width, pu.lumaSize().height );
if (pu.mergeFlag && CU::isIBC(*pu.cu))
{
pu.mmvdMergeFlag = false;
pu.regularMergeFlag = false;
return;
}
}
void CABACReader::merge_data( PredictionUnit& pu )
{
if (CU::isIBC(*pu.cu))
{
merge_idx(pu);
return;
}
else
{
CodingUnit cu = *pu.cu;
subblock_merge_flag(*pu.cu);
if (pu.cu->affine)
{
merge_idx(pu);
cu.firstPU->regularMergeFlag = false;
return;
}
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__MERGE_FLAG );
const bool ciipAvailable = pu.cs->sps->getUseCiip() && !pu.cu->skip && pu.cu->lwidth() < MAX_CU_SIZE && pu.cu->lheight() < MAX_CU_SIZE && pu.cu->lwidth() * pu.cu->lheight() >= 64;
const bool geoAvailable = pu.cu->cs->slice->getSPS()->getUseGeo() && pu.cu->cs->slice->isInterB()
&& pu.cs->sps->getMaxNumGeoCand() > 1 && pu.cu->lwidth() >= GEO_MIN_CU_SIZE
&& pu.cu->lheight() >= GEO_MIN_CU_SIZE && pu.cu->lwidth() <= GEO_MAX_CU_SIZE
&& pu.cu->lheight() <= GEO_MAX_CU_SIZE && pu.cu->lwidth() < 8 * pu.cu->lheight()
&& pu.cu->lheight() < 8 * pu.cu->lwidth();
if (geoAvailable || ciipAvailable)
{
cu.firstPU->regularMergeFlag = m_BinDecoder.decodeBin(Ctx::RegularMergeFlag(cu.skip ? 0 : 1));
}
else
{
cu.firstPU->regularMergeFlag = true;
}
if (cu.firstPU->regularMergeFlag)
{
if (cu.cs->slice->getSPS()->getUseMMVD())
{
cu.firstPU->mmvdMergeFlag = m_BinDecoder.decodeBin(Ctx::MmvdFlag(0));
}
else
{
cu.firstPU->mmvdMergeFlag = false;
}
if (cu.skip)
{
cu.mmvdSkip = cu.firstPU->mmvdMergeFlag;
}
}
else
{
pu.mmvdMergeFlag = false;
pu.cu->mmvdSkip = false;
if (geoAvailable && ciipAvailable)
{
Ciip_flag(pu);
}
else if (ciipAvailable)
{
pu.ciipFlag = true;
}
else
{
pu.ciipFlag = false;
}
if (pu.ciipFlag)
{
pu.intraDir[0] = PLANAR_IDX;
pu.intraDir[1] = DM_CHROMA_IDX;
}
else
{
pu.cu->geoFlag = true;
}
}
}
if (pu.mmvdMergeFlag || pu.cu->mmvdSkip)
{
mmvd_merge_idx(pu);
}
else
{
merge_idx(pu);
}
}
void CABACReader::merge_idx( PredictionUnit& pu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__MERGE_INDEX );
if ( pu.cu->affine )
{
int numCandminus1 = int( pu.cs->picHeader->getMaxNumAffineMergeCand() ) - 1;
pu.mergeIdx = 0;
if ( numCandminus1 > 0 )
{
if ( m_BinDecoder.decodeBin( Ctx::AffMergeIdx() ) )
{
pu.mergeIdx++;
for ( ; pu.mergeIdx < numCandminus1; pu.mergeIdx++ )
{
if (!m_BinDecoder.decodeBinEP())
{
break;
}
}
}
}
DTRACE( g_trace_ctx, D_SYNTAX, "aff_merge_idx() aff_merge_idx=%d\n", pu.mergeIdx );
}
else
{
int numCandminus1 = int(pu.cs->sps->getMaxNumMergeCand()) - 1;
pu.mergeIdx = 0;
if (pu.cu->geoFlag)
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(STATS__CABAC_BITS__GEO_INDEX);
uint32_t splitDir = 0;
xReadTruncBinCode(splitDir, GEO_NUM_PARTITION_MODE);
pu.geoSplitDir = splitDir;
const int maxNumGeoCand = pu.cs->sps->getMaxNumGeoCand();
CHECK(maxNumGeoCand < 2, "Incorrect max number of geo candidates");
CHECK(pu.cu->lheight() > 64 || pu.cu->lwidth() > 64, "Incorrect block size of geo flag");
int numCandminus2 = maxNumGeoCand - 2;
pu.mergeIdx = 0;
int mergeCand0 = 0;
int mergeCand1 = 0;
if (m_BinDecoder.decodeBin(Ctx::MergeIdx()))
{
mergeCand0 += unary_max_eqprob(numCandminus2) + 1;
}
if (numCandminus2 > 0)
{
if (m_BinDecoder.decodeBin(Ctx::MergeIdx()))
{
mergeCand1 += unary_max_eqprob(numCandminus2 - 1) + 1;
}
}
mergeCand1 += mergeCand1 >= mergeCand0 ? 1 : 0;
pu.geoMergeIdx0 = mergeCand0;
pu.geoMergeIdx1 = mergeCand1;
DTRACE(g_trace_ctx, D_SYNTAX, "merge_idx() geo_split_dir=%d\n", splitDir);
DTRACE(g_trace_ctx, D_SYNTAX, "merge_idx() geo_idx0=%d\n", mergeCand0);
DTRACE(g_trace_ctx, D_SYNTAX, "merge_idx() geo_idx1=%d\n", mergeCand1);
return;
}
if (pu.cu->predMode == MODE_IBC)
{
numCandminus1 = int(pu.cs->sps->getMaxNumIBCMergeCand()) - 1;
}
if (numCandminus1 > 0)
{
if (m_BinDecoder.decodeBin(Ctx::MergeIdx()))
{
pu.mergeIdx++;
for (; pu.mergeIdx < numCandminus1; pu.mergeIdx++)
{
if( !m_BinDecoder.decodeBinEP() )
{
break;
}
}
}
}
DTRACE(g_trace_ctx, D_SYNTAX, "merge_idx() merge_idx=%d\n", pu.mergeIdx);
}
}
void CABACReader::mmvd_merge_idx(PredictionUnit& pu)
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(STATS__CABAC_BITS__MERGE_INDEX);
int var0 = 0;
if (pu.cs->sps->getMaxNumMergeCand() > 1)
{
static_assert(MMVD_BASE_MV_NUM == 2, "");
var0 = m_BinDecoder.decodeBin(Ctx::MmvdMergeIdx());
}
DTRACE(g_trace_ctx, D_SYNTAX, "base_mvp_idx() base_mvp_idx=%d\n", var0);
int numCandminus1_step = MMVD_REFINE_STEP - 1;
int var1 = 0;
if (m_BinDecoder.decodeBin(Ctx::MmvdStepMvpIdx()))
{
var1++;
for (; var1 < numCandminus1_step; var1++)
{
if (!m_BinDecoder.decodeBinEP())
{
break;
}
}
}
DTRACE(g_trace_ctx, D_SYNTAX, "MmvdStepMvpIdx() MmvdStepMvpIdx=%d\n", var1);
int var2 = 0;
if (m_BinDecoder.decodeBinEP())
{
var2 += 2;
if (m_BinDecoder.decodeBinEP())
{
var2 += 1;
}
}
else
{
var2 += 0;
if (m_BinDecoder.decodeBinEP())
{
var2 += 1;
}
}
DTRACE(g_trace_ctx, D_SYNTAX, "pos() pos=%d\n", var2);
int mvpIdx = (var0 * MMVD_MAX_REFINE_NUM + var1 * 4 + var2);
pu.mmvdMergeIdx = mvpIdx;
DTRACE(g_trace_ctx, D_SYNTAX, "mmvd_merge_idx() mmvd_merge_idx=%d\n", pu.mmvdMergeIdx);
}
void CABACReader::inter_pred_idc( PredictionUnit& pu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__INTER_DIR );
if( pu.cs->slice->isInterP() )
{
pu.interDir = 1;
return;
}
if( !(PU::isBipredRestriction(pu)) )
{
unsigned ctxId = DeriveCtx::CtxInterDir(pu);
if( m_BinDecoder.decodeBin( Ctx::InterDir(ctxId) ) )
{
DTRACE( g_trace_ctx, D_SYNTAX, "inter_pred_idc() ctx=%d value=%d pos=(%d,%d)\n", ctxId, 3, pu.lumaPos().x, pu.lumaPos().y );
pu.interDir = 3;
return;
}
}
if( m_BinDecoder.decodeBin( Ctx::InterDir(5) ) )
{
DTRACE( g_trace_ctx, D_SYNTAX, "inter_pred_idc() ctx=5 value=%d pos=(%d,%d)\n", 2, pu.lumaPos().x, pu.lumaPos().y );
pu.interDir = 2;
return;
}
DTRACE( g_trace_ctx, D_SYNTAX, "inter_pred_idc() ctx=5 value=%d pos=(%d,%d)\n", 1, pu.lumaPos().x, pu.lumaPos().y );
pu.interDir = 1;
return;
}
void CABACReader::ref_idx( PredictionUnit &pu, RefPicList eRefList )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__REF_FRM_IDX );
if ( pu.cu->smvdMode )
{
pu.refIdx[eRefList] = pu.cs->slice->getSymRefIdx( eRefList );
return;
}
int numRef = pu.cs->slice->getNumRefIdx(eRefList);
if( numRef <= 1 || !m_BinDecoder.decodeBin( Ctx::RefPic() ) )
{
if( numRef > 1 )
{
DTRACE( g_trace_ctx, D_SYNTAX, "ref_idx() value=%d pos=(%d,%d)\n", 0, pu.lumaPos().x, pu.lumaPos().y );
}
pu.refIdx[eRefList] = 0;
return;
}
if( numRef <= 2 || !m_BinDecoder.decodeBin( Ctx::RefPic(1) ) )
{
DTRACE( g_trace_ctx, D_SYNTAX, "ref_idx() value=%d pos=(%d,%d)\n", 1, pu.lumaPos().x, pu.lumaPos().y );
pu.refIdx[eRefList] = 1;
return;
}
for( int idx = 3; ; idx++ )
{
if( numRef <= idx || !m_BinDecoder.decodeBinEP() )
{
pu.refIdx[eRefList] = (signed char)( idx - 1 );
DTRACE( g_trace_ctx, D_SYNTAX, "ref_idx() value=%d pos=(%d,%d)\n", idx-1, pu.lumaPos().x, pu.lumaPos().y );
return;
}
}
}
void CABACReader::mvp_flag( PredictionUnit& pu, RefPicList eRefList )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__MVP_IDX );
unsigned mvp_idx = m_BinDecoder.decodeBin( Ctx::MVPIdx() );
DTRACE( g_trace_ctx, D_SYNTAX, "mvp_flag() value=%d pos=(%d,%d)\n", mvp_idx, pu.lumaPos().x, pu.lumaPos().y );
pu.mvpIdx [eRefList] = mvp_idx;
DTRACE( g_trace_ctx, D_SYNTAX, "mvpIdx(refList:%d)=%d\n", eRefList, mvp_idx );
}
void CABACReader::Ciip_flag(PredictionUnit& pu)
{
if (!pu.cs->sps->getUseCiip())
{
pu.ciipFlag = false;
return;
}
if (pu.cu->skip)
{
pu.ciipFlag = false;
return;
}
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(STATS__CABAC_BITS__MH_INTRA_FLAG);
pu.ciipFlag = (m_BinDecoder.decodeBin(Ctx::CiipFlag()));
DTRACE(g_trace_ctx, D_SYNTAX, "Ciip_flag() Ciip=%d pos=(%d,%d) size=%dx%d\n", pu.ciipFlag ? 1 : 0, pu.lumaPos().x, pu.lumaPos().y, pu.lumaSize().width, pu.lumaSize().height);
}
//================================================================================
// clause 7.3.8.8
//--------------------------------------------------------------------------------
// void transform_tree ( cs, area, cuCtx, chromaCbfs )
// bool split_transform_flag( depth )
// bool cbf_comp ( area, depth )
//================================================================================
void CABACReader::transform_tree( CodingStructure &cs, Partitioner &partitioner, CUCtx& cuCtx, const PartSplit ispType, const int subTuIdx )
{
const UnitArea& area = partitioner.currArea();
CodingUnit& cu = *cs.getCU(area.blocks[partitioner.chType], partitioner.chType);
int subTuCounter = subTuIdx;
// split_transform_flag
bool split = partitioner.canSplit(TU_MAX_TR_SPLIT, cs);
const unsigned trDepth = partitioner.currTrDepth;
if( cu.sbtInfo && partitioner.canSplit( PartSplit( cu.getSbtTuSplit() ), cs ) )
{
split = true;
}
if( !split && cu.ispMode )
{
split = partitioner.canSplit( ispType, cs );
}
if( split )
{
if (partitioner.canSplit(TU_MAX_TR_SPLIT, cs))
{
#if ENABLE_TRACING
const CompArea &tuArea = partitioner.currArea().blocks[partitioner.chType];
DTRACE(g_trace_ctx, D_SYNTAX, "transform_tree() maxTrSplit chType=%d pos=(%d,%d) size=%dx%d\n",
partitioner.chType, tuArea.x, tuArea.y, tuArea.width, tuArea.height);
#endif
partitioner.splitCurrArea(TU_MAX_TR_SPLIT, cs);
}
else if (cu.ispMode)
{
partitioner.splitCurrArea(ispType, cs);
}
else if (cu.sbtInfo && partitioner.canSplit(PartSplit(cu.getSbtTuSplit()), cs))
{
partitioner.splitCurrArea(PartSplit(cu.getSbtTuSplit()), cs);
}
else
{
THROW("Implicit TU split not available!");
}
do
{
transform_tree( cs, partitioner, cuCtx, ispType, subTuCounter );
subTuCounter += subTuCounter != -1 ? 1 : 0;
} while( partitioner.nextPart( cs ) );
partitioner.exitCurrSplit();
}
else
{
TransformUnit &tu = cs.addTU( CS::getArea( cs, area, partitioner.chType ), partitioner.chType );
unsigned numBlocks = ::getNumberValidTBlocks( *cs.pcv );
tu.checkTuNoResidual( partitioner.currPartIdx() );
for( unsigned compID = COMPONENT_Y; compID < numBlocks; compID++ )
{
if( tu.blocks[compID].valid() )
{
tu.getCoeffs( ComponentID( compID ) ).fill( 0 );
tu.getPcmbuf( ComponentID( compID ) ).fill( 0 );
}
}
tu.depth = trDepth;
DTRACE( g_trace_ctx, D_SYNTAX, "transform_unit() pos=(%d,%d) size=%dx%d depth=%d trDepth=%d\n", tu.blocks[tu.chType].x, tu.blocks[tu.chType].y, tu.blocks[tu.chType].width, tu.blocks[tu.chType].height, cu.depth, partitioner.currTrDepth );
transform_unit(tu, cuCtx, partitioner, subTuCounter);
}
}
bool CABACReader::cbf_comp( CodingStructure& cs, const CompArea& area, unsigned depth, const bool prevCbf, const bool useISP )
{
unsigned ctxId = DeriveCtx::CtxQtCbf(area.compID, prevCbf, useISP && isLuma(area.compID));
const CtxSet& ctxSet = Ctx::QtCbf[ area.compID ];
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2(STATS__CABAC_BITS__QT_CBF, area.size(), area.compID);
unsigned cbf = 0;
if( (area.compID == COMPONENT_Y && cs.getCU(area.pos(), toChannelType(area.compID))->bdpcmMode)
|| (area.compID != COMPONENT_Y && cs.getCU(area.pos(), toChannelType(area.compID))->bdpcmModeChroma))
{
if (area.compID == COMPONENT_Y)
{
ctxId = 1;
}
else if (area.compID == COMPONENT_Cb)
{
ctxId = 1;
}
else
{
ctxId = 2;
}
cbf = m_BinDecoder.decodeBin(ctxSet(ctxId));
}
else
{
cbf = m_BinDecoder.decodeBin( ctxSet( ctxId ) );
}
DTRACE( g_trace_ctx, D_SYNTAX, "cbf_comp() etype=%d pos=(%d,%d) ctx=%d cbf=%d\n", area.compID, area.x, area.y, ctxId, cbf );
return cbf;
}
//================================================================================
// clause 7.3.8.9
//--------------------------------------------------------------------------------
// void mvd_coding( pu, refList )
//================================================================================
void CABACReader::mvd_coding( Mv &rMvd )
{
#if RExt__DECODER_DEBUG_BIT_STATISTICS
CodingStatisticsClassType ctype_mvd ( STATS__CABAC_BITS__MVD );
CodingStatisticsClassType ctype_mvd_ep ( STATS__CABAC_BITS__MVD_EP );
#endif
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_mvd );
// abs_mvd_greater0_flag[ 0 | 1 ]
int horAbs = (int)m_BinDecoder.decodeBin(Ctx::Mvd());
int verAbs = (int)m_BinDecoder.decodeBin(Ctx::Mvd());
// abs_mvd_greater1_flag[ 0 | 1 ]
if (horAbs)
{
horAbs += (int)m_BinDecoder.decodeBin(Ctx::Mvd(1));
}
if (verAbs)
{
verAbs += (int)m_BinDecoder.decodeBin(Ctx::Mvd(1));
}
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_mvd_ep );
// abs_mvd_minus2[ 0 | 1 ] and mvd_sign_flag[ 0 | 1 ]
if (horAbs)
{
if (horAbs > 1)
{
horAbs += m_BinDecoder.decodeRemAbsEP(1, 0, MV_BITS - 1);
}
if (m_BinDecoder.decodeBinEP())
{
horAbs = -horAbs;
}
}
if (verAbs)
{
if (verAbs > 1)
{
verAbs += m_BinDecoder.decodeRemAbsEP(1, 0, MV_BITS - 1);
}
if (m_BinDecoder.decodeBinEP())
{
verAbs = -verAbs;
}
}
rMvd = Mv(horAbs, verAbs);
CHECK(!((horAbs >= MVD_MIN) && (horAbs <= MVD_MAX)) || !((verAbs >= MVD_MIN) && (verAbs <= MVD_MAX)), "Illegal MVD value");
}
//================================================================================
// clause 7.3.8.10
//--------------------------------------------------------------------------------
// void transform_unit ( tu, cuCtx, chromaCbfs )
// void cu_qp_delta ( cu )
// void cu_chroma_qp_offset ( cu )
//================================================================================
void CABACReader::transform_unit( TransformUnit& tu, CUCtx& cuCtx, Partitioner& partitioner, const int subTuCounter)
{
const UnitArea& area = partitioner.currArea();
const unsigned trDepth = partitioner.currTrDepth;
CodingStructure& cs = *tu.cs;
CodingUnit& cu = *tu.cu;
ChromaCbfs chromaCbfs;
chromaCbfs.Cb = chromaCbfs.Cr = false;
const bool chromaCbfISP = area.chromaFormat != CHROMA_400 && area.blocks[COMPONENT_Cb].valid() && cu.ispMode;
// cbf_cb & cbf_cr
if (area.chromaFormat != CHROMA_400 && area.blocks[COMPONENT_Cb].valid() && (!cu.isSepTree() || partitioner.chType == CHANNEL_TYPE_CHROMA) && (!cu.ispMode || chromaCbfISP))
{
const int cbfDepth = chromaCbfISP ? trDepth - 1 : trDepth;
if (!(cu.sbtInfo && tu.noResidual))
{
chromaCbfs.Cb = cbf_comp(cs, area.blocks[COMPONENT_Cb], cbfDepth);
}
if (!(cu.sbtInfo && tu.noResidual))
{
chromaCbfs.Cr = cbf_comp(cs, area.blocks[COMPONENT_Cr], cbfDepth, chromaCbfs.Cb);
}
}
else if (cu.isSepTree())
{
chromaCbfs = ChromaCbfs(false);
}
if (!isChroma(partitioner.chType))
{
if (!CU::isIntra(cu) && trDepth == 0 && !chromaCbfs.sigChroma(area.chromaFormat))
{
TU::setCbfAtDepth(tu, COMPONENT_Y, trDepth, 1);
}
else if (cu.sbtInfo && tu.noResidual)
{
TU::setCbfAtDepth(tu, COMPONENT_Y, trDepth, 0);
}
else if (cu.sbtInfo && !chromaCbfs.sigChroma(area.chromaFormat))
{
assert(!tu.noResidual);
TU::setCbfAtDepth(tu, COMPONENT_Y, trDepth, 1);
}
else
{
bool lumaCbfIsInferredACT = (cu.colorTransform && cu.predMode == MODE_INTRA && trDepth == 0 && !chromaCbfs.sigChroma(area.chromaFormat));
bool lastCbfIsInferred = lumaCbfIsInferredACT; // ISP and ACT are mutually exclusive
bool previousCbf = false;
bool rootCbfSoFar = false;
if (cu.ispMode)
{
uint32_t nTus = cu.ispMode == HOR_INTRA_SUBPARTITIONS ? cu.lheight() >> floorLog2(tu.lheight()) : cu.lwidth() >> floorLog2(tu.lwidth());
if (subTuCounter == nTus - 1)
{
TransformUnit* tuPointer = cu.firstTU;
for (int tuIdx = 0; tuIdx < nTus - 1; tuIdx++)
{
rootCbfSoFar |= TU::getCbfAtDepth(*tuPointer, COMPONENT_Y, trDepth);
tuPointer = tuPointer->next;
}
if (!rootCbfSoFar)
{
lastCbfIsInferred = true;
}
}
if (!lastCbfIsInferred)
{
previousCbf = TU::getPrevTuCbfAtDepth(tu, COMPONENT_Y, trDepth);
}
}
bool cbfY = lastCbfIsInferred ? true : cbf_comp(cs, tu.Y(), trDepth, previousCbf, cu.ispMode);
TU::setCbfAtDepth(tu, COMPONENT_Y, trDepth, (cbfY ? 1 : 0));
}
}
if (area.chromaFormat != CHROMA_400 && (!cu.ispMode || chromaCbfISP))
{
TU::setCbfAtDepth(tu, COMPONENT_Cb, trDepth, (chromaCbfs.Cb ? 1 : 0));
TU::setCbfAtDepth(tu, COMPONENT_Cr, trDepth, (chromaCbfs.Cr ? 1 : 0));
}
bool lumaOnly = ( cu.chromaFormat == CHROMA_400 || !tu.blocks[COMPONENT_Cb].valid() );
bool cbfLuma = ( tu.cbf[ COMPONENT_Y ] != 0 );
bool cbfChroma = ( lumaOnly ? false : ( chromaCbfs.Cb || chromaCbfs.Cr ) );
if( ( cu.lwidth() > 64 || cu.lheight() > 64 || cbfLuma || cbfChroma ) &&
(!tu.cu->isSepTree() || isLuma(tu.chType)) )
{
if( cu.cs->pps->getUseDQP() && !cuCtx.isDQPCoded )
{
cu_qp_delta(cu, cuCtx.qp, cu.qp);
cuCtx.qp = cu.qp;
cuCtx.isDQPCoded = true;
}
}
if (!cu.isSepTree() || isChroma(tu.chType)) // !DUAL_TREE_LUMA
{
SizeType channelWidth = !cu.isSepTree() ? cu.lwidth() : cu.chromaSize().width;
SizeType channelHeight = !cu.isSepTree() ? cu.lheight() : cu.chromaSize().height;
if (cu.cs->slice->getUseChromaQpAdj() && (channelWidth > 64 || channelHeight > 64 || cbfChroma) && !cuCtx.isChromaQpAdjCoded)
{
cu_chroma_qp_offset(cu);
cuCtx.isChromaQpAdjCoded = true;
}
}
if( !lumaOnly )
{
joint_cb_cr( tu, ( tu.cbf[COMPONENT_Cb] ? 2 : 0 ) + ( tu.cbf[COMPONENT_Cr] ? 1 : 0 ) );
}
if (cbfLuma)
{
residual_coding(tu, COMPONENT_Y, cuCtx);
}
if (!lumaOnly)
{
for (ComponentID compID = COMPONENT_Cb; compID <= COMPONENT_Cr; compID = ComponentID(compID + 1))
{
if (tu.cbf[compID])
{
residual_coding(tu, compID, cuCtx);
}
}
}
}
void CABACReader::cu_qp_delta( CodingUnit& cu, int predQP, int8_t& qp )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__DELTA_QP_EP );
CHECK( predQP == std::numeric_limits<int>::max(), "Invalid predicted QP" );
int qpY = predQP;
int DQp = unary_max_symbol( Ctx::DeltaQP(), Ctx::DeltaQP(1), CU_DQP_TU_CMAX );
if( DQp >= CU_DQP_TU_CMAX )
{
DQp += exp_golomb_eqprob( CU_DQP_EG_k );
}
if( DQp > 0 )
{
if( m_BinDecoder.decodeBinEP( ) )
{
DQp = -DQp;
}
int qpBdOffsetY = cu.cs->sps->getQpBDOffset( CHANNEL_TYPE_LUMA );
qpY = ( (predQP + DQp + (MAX_QP + 1) + 2 * qpBdOffsetY) % ((MAX_QP + 1) + qpBdOffsetY)) - qpBdOffsetY;
}
qp = (int8_t)qpY;
DTRACE( g_trace_ctx, D_DQP, "x=%d, y=%d, d=%d, pred_qp=%d, DQp=%d, qp=%d\n", cu.blocks[cu.chType].lumaPos().x, cu.blocks[cu.chType].lumaPos().y, cu.qtDepth, predQP, DQp, qp );
}
void CABACReader::cu_chroma_qp_offset( CodingUnit& cu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__CHROMA_QP_ADJUSTMENT, cu.blocks[cu.chType].lumaSize(), CHANNEL_TYPE_CHROMA );
// cu_chroma_qp_offset_flag
int length = cu.cs->pps->getChromaQpOffsetListLen();
unsigned qpAdj = m_BinDecoder.decodeBin( Ctx::ChromaQpAdjFlag() );
if( qpAdj && length > 1 )
{
// cu_chroma_qp_offset_idx
qpAdj += unary_max_symbol( Ctx::ChromaQpAdjIdc(), Ctx::ChromaQpAdjIdc(), length-1 );
}
/* NB, symbol = 0 if outer flag is not set,
* 1 if outer flag is set and there is no inner flag
* 1+ otherwise */
cu.chromaQpAdj = cu.cs->chromaQpAdj = qpAdj;
}
//================================================================================
// clause 7.3.8.11
//--------------------------------------------------------------------------------
// void residual_coding ( tu, compID )
// bool transform_skip_flag ( tu, compID )
// int last_sig_coeff ( coeffCtx )
// void residual_coding_subblock( coeffCtx )
//================================================================================
void CABACReader::joint_cb_cr( TransformUnit& tu, const int cbfMask )
{
if ( !tu.cu->slice->getSPS()->getJointCbCrEnabledFlag() )
{
return;
}
if( ( CU::isIntra( *tu.cu ) && cbfMask ) || ( cbfMask == 3 ) )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__JOINT_CB_CR, tu.blocks[COMPONENT_Cr].lumaSize(), CHANNEL_TYPE_CHROMA );
tu.jointCbCr = ( m_BinDecoder.decodeBin( Ctx::JointCbCrFlag( cbfMask-1 ) ) ? cbfMask : 0 );
}
}
void CABACReader::residual_coding( TransformUnit& tu, ComponentID compID, CUCtx& cuCtx )
{
const CodingUnit& cu = *tu.cu;
DTRACE( g_trace_ctx, D_SYNTAX, "residual_coding() etype=%d pos=(%d,%d) size=%dx%d predMode=%d\n", tu.blocks[compID].compID, tu.blocks[compID].x, tu.blocks[compID].y, tu.blocks[compID].width, tu.blocks[compID].height, cu.predMode );
if( compID == COMPONENT_Cr && tu.jointCbCr == 3 )
{
return;
}
ts_flag ( tu, compID );
if( tu.mtsIdx[compID] == MTS_SKIP && !tu.cs->slice->getTSResidualCodingDisabledFlag() )
{
residual_codingTS( tu, compID );
return;
}
// determine sign hiding
bool signHiding = cu.cs->slice->getSignDataHidingEnabledFlag();
// init coeff coding context
CoeffCodingContext cctx ( tu, compID, signHiding );
TCoeff* coeff = tu.getCoeffs( compID ).buf;
// parse last coeff position
cctx.setScanPosLast( last_sig_coeff( cctx, tu, compID ) );
if (tu.mtsIdx[compID] != MTS_SKIP && tu.blocks[compID].height >= 4 && tu.blocks[compID].width >= 4 )
{
const int maxLfnstPos = ((tu.blocks[compID].height == 4 && tu.blocks[compID].width == 4) || (tu.blocks[compID].height == 8 && tu.blocks[compID].width == 8)) ? 7 : 15;
cuCtx.violatesLfnstConstrained[ toChannelType(compID) ] |= cctx.scanPosLast() > maxLfnstPos;
}
if( tu.mtsIdx[compID] != MTS_SKIP && tu.blocks[compID].height >= 4 && tu.blocks[compID].width >= 4 )
{
const int lfnstLastScanPosTh = isLuma( compID ) ? LFNST_LAST_SIG_LUMA : LFNST_LAST_SIG_CHROMA;
cuCtx.lfnstLastScanPos |= cctx.scanPosLast() >= lfnstLastScanPosTh;
}
if (isLuma(compID) && tu.mtsIdx[compID] != MTS_SKIP)
{
cuCtx.mtsLastScanPos |= cctx.scanPosLast() >= 1;
}
// parse subblocks
const int stateTransTab = ( tu.cs->slice->getDepQuantEnabledFlag() ? 32040 : 0 );
int state = 0;
int ctxBinSampleRatio = (compID == COMPONENT_Y) ? MAX_TU_LEVEL_CTX_CODED_BIN_CONSTRAINT_LUMA : MAX_TU_LEVEL_CTX_CODED_BIN_CONSTRAINT_CHROMA;
cctx.regBinLimit = (tu.getTbAreaAfterCoefZeroOut(compID) * ctxBinSampleRatio) >> 4;
#if JVET_V0106_RRC_RICE
int baseLevel = m_BinDecoder.getCtx().getBaseLevel();
cctx.setBaseLevel(baseLevel);
if (tu.cs->slice->getSPS()->getSpsRangeExtension().getPersistentRiceAdaptationEnabledFlag())
{
cctx.setUpdateHist(1);
unsigned riceStats = m_BinDecoder.getCtx().getGRAdaptStats((unsigned)compID);
TCoeff historyValue = (TCoeff)1 << riceStats;
cctx.setHistValue(historyValue);
}
#endif
for (int subSetId = (cctx.scanPosLast() >> cctx.log2CGSize()); subSetId >= 0; subSetId--)
{
cctx.initSubblock(subSetId);
if (tu.cs->sps->getUseMTS() && tu.cu->sbtInfo != 0 && tu.blocks[compID].height <= 32
&& tu.blocks[compID].width <= 32 && compID == COMPONENT_Y)
{
if ((tu.blocks[compID].height == 32 && cctx.cgPosY() >= (16 >> cctx.log2CGHeight()))
|| (tu.blocks[compID].width == 32 && cctx.cgPosX() >= (16 >> cctx.log2CGWidth())))
{
continue;
}
}
residual_coding_subblock(cctx, coeff, stateTransTab, state);
if (isLuma(compID) && cctx.isSigGroup() && (cctx.cgPosY() > 3 || cctx.cgPosX() > 3))
{
cuCtx.violatesMtsCoeffConstraint = true;
}
}
}
void CABACReader::ts_flag( TransformUnit& tu, ComponentID compID )
{
int tsFlag = ( (tu.cu->bdpcmMode && isLuma(compID)) || (tu.cu->bdpcmModeChroma && isChroma(compID)) ) ? 1 : tu.mtsIdx[compID] == MTS_SKIP ? 1 : 0;
int ctxIdx = isLuma(compID) ? 0 : 1;
if( TU::isTSAllowed ( tu, compID ) )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__MTS_FLAGS, tu.blocks[compID], compID );
tsFlag = m_BinDecoder.decodeBin( Ctx::TransformSkipFlag( ctxIdx ) );
}
tu.mtsIdx[compID] = tsFlag ? MTS_SKIP : MTS_DCT2_DCT2;
DTRACE(g_trace_ctx, D_SYNTAX, "ts_flag() etype=%d pos=(%d,%d) mtsIdx=%d\n", COMPONENT_Y, tu.cu->lx(), tu.cu->ly(), tsFlag);
}
void CABACReader::mts_idx( CodingUnit& cu, CUCtx& cuCtx )
{
TransformUnit &tu = *cu.firstTU;
int mtsIdx = tu.mtsIdx[COMPONENT_Y]; // Transform skip flag has already been decoded
if( CU::isMTSAllowed( cu, COMPONENT_Y ) && !cuCtx.violatesMtsCoeffConstraint &&
cuCtx.mtsLastScanPos && cu.lfnstIdx == 0 && mtsIdx != MTS_SKIP)
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__MTS_FLAGS, tu.blocks[COMPONENT_Y], COMPONENT_Y );
int ctxIdx = 0;
int symbol = m_BinDecoder.decodeBin( Ctx::MTSIdx(ctxIdx));
if( symbol )
{
ctxIdx = 1;
mtsIdx = MTS_DST7_DST7; // mtsIdx = 2 -- 4
for( int i = 0; i < 3; i++, ctxIdx++ )
{
symbol = m_BinDecoder.decodeBin( Ctx::MTSIdx(ctxIdx));
mtsIdx += symbol;
if( !symbol )
{
break;
}
}
}
}
tu.mtsIdx[COMPONENT_Y] = mtsIdx;
DTRACE(g_trace_ctx, D_SYNTAX, "mts_idx() etype=%d pos=(%d,%d) mtsIdx=%d\n", COMPONENT_Y, tu.cu->lx(), tu.cu->ly(), mtsIdx);
}
void CABACReader::isp_mode( CodingUnit& cu )
{
if( !CU::isIntra( cu ) || !isLuma( cu.chType ) || cu.firstPU->multiRefIdx || !cu.cs->sps->getUseISP() || cu.bdpcmMode || !CU::canUseISP( cu, getFirstComponentOfChannel( cu.chType ) ) || cu.colorTransform )
{
cu.ispMode = NOT_INTRA_SUBPARTITIONS;
return;
}
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET(STATS__CABAC_BITS__ISP_MODE_FLAG);
int symbol = m_BinDecoder.decodeBin(Ctx::ISPMode(0));
if( symbol )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__ISP_SPLIT_FLAG );
cu.ispMode = 1 + m_BinDecoder.decodeBin( Ctx::ISPMode( 1 ) );
}
DTRACE( g_trace_ctx, D_SYNTAX, "intra_subPartitions() etype=%d pos=(%d,%d) ispIdx=%d\n", cu.chType, cu.blocks[cu.chType].x, cu.blocks[cu.chType].y, (int)cu.ispMode );
}
void CABACReader::residual_lfnst_mode( CodingUnit& cu, CUCtx& cuCtx )
{
int chIdx = cu.isSepTree() && cu.chType == CHANNEL_TYPE_CHROMA ? 1 : 0;
if ((cu.ispMode && !CU::canUseLfnstWithISP(cu, cu.chType))
|| (cu.cs->sps->getUseLFNST() && CU::isIntra(cu) && cu.mipFlag && !allowLfnstWithMip(cu.firstPU->lumaSize()))
|| (cu.isSepTree() && cu.chType == CHANNEL_TYPE_CHROMA && std::min(cu.blocks[1].width, cu.blocks[1].height) < 4)
|| (cu.blocks[chIdx].lumaSize().width > cu.cs->sps->getMaxTbSize()
|| cu.blocks[chIdx].lumaSize().height > cu.cs->sps->getMaxTbSize()))
{
return;
}
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__LFNST );
if( cu.cs->sps->getUseLFNST() && CU::isIntra( cu ) )
{
const bool lumaFlag = cu.isSepTree() ? ( isLuma( cu.chType ) ? true : false ) : true;
const bool chromaFlag = cu.isSepTree() ? ( isChroma( cu.chType ) ? true : false ) : true;
bool nonZeroCoeffNonTsCorner8x8 = ( lumaFlag && cuCtx.violatesLfnstConstrained[CHANNEL_TYPE_LUMA] ) || (chromaFlag && cuCtx.violatesLfnstConstrained[CHANNEL_TYPE_CHROMA] );
bool isTrSkip = false;
for (auto &currTU : CU::traverseTUs(cu))
{
const uint32_t numValidComp = getNumberValidComponents(cu.chromaFormat);
for (uint32_t compID = COMPONENT_Y; compID < numValidComp; compID++)
{
if (currTU.blocks[compID].valid() && TU::getCbf(currTU, (ComponentID)compID) && currTU.mtsIdx[compID] == MTS_SKIP)
{
isTrSkip = true;
break;
}
}
}
if ((!cuCtx.lfnstLastScanPos && !cu.ispMode) || nonZeroCoeffNonTsCorner8x8 || isTrSkip)
{
cu.lfnstIdx = 0;
return;
}
}
else
{
cu.lfnstIdx = 0;
return;
}
unsigned cctx = 0;
if ( cu.isSepTree() ) cctx++;
uint32_t idxLFNST = m_BinDecoder.decodeBin( Ctx::LFNSTIdx( cctx ) );
if( idxLFNST )
{
idxLFNST += m_BinDecoder.decodeBin(Ctx::LFNSTIdx(2));
}
cu.lfnstIdx = idxLFNST;
DTRACE( g_trace_ctx, D_SYNTAX, "residual_lfnst_mode() etype=%d pos=(%d,%d) mode=%d\n", COMPONENT_Y, cu.lx(), cu.ly(), ( int ) cu.lfnstIdx );
}
int CABACReader::last_sig_coeff( CoeffCodingContext& cctx, TransformUnit& tu, ComponentID compID )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__LAST_SIG_X_Y, Size( cctx.width(), cctx.height() ), cctx.compID() );
unsigned PosLastX = 0, PosLastY = 0;
unsigned maxLastPosX = cctx.maxLastPosX();
unsigned maxLastPosY = cctx.maxLastPosY();
if( tu.cs->sps->getUseMTS() && tu.cu->sbtInfo != 0 && tu.blocks[ compID ].width <= 32 && tu.blocks[ compID ].height <= 32 && compID == COMPONENT_Y )
{
maxLastPosX = (tu.blocks[compID].width == 32) ? g_groupIdx[15] : maxLastPosX;
maxLastPosY = (tu.blocks[compID].height == 32) ? g_groupIdx[15] : maxLastPosY;
}
for( ; PosLastX < maxLastPosX; PosLastX++ )
{
if( !m_BinDecoder.decodeBin( cctx.lastXCtxId( PosLastX ) ) )
{
break;
}
}
for( ; PosLastY < maxLastPosY; PosLastY++ )
{
if( !m_BinDecoder.decodeBin( cctx.lastYCtxId( PosLastY ) ) )
{
break;
}
}
if( PosLastX > 3 )
{
uint32_t temp = 0;
uint32_t uiCount = ( PosLastX - 2 ) >> 1;
for ( int i = uiCount - 1; i >= 0; i-- )
{
temp += m_BinDecoder.decodeBinEP() << i;
}
PosLastX = g_minInGroup[PosLastX] + temp;
}
if( PosLastY > 3 )
{
uint32_t temp = 0;
uint32_t uiCount = ( PosLastY - 2 ) >> 1;
for ( int i = uiCount - 1; i >= 0; i-- )
{
temp += m_BinDecoder.decodeBinEP() << i;
}
PosLastY = g_minInGroup[PosLastY] + temp;
}
int blkPos;
blkPos = PosLastX + (PosLastY * cctx.width());
int scanPos = 0;
for( ; scanPos < cctx.maxNumCoeff() - 1; scanPos++ )
{
if( blkPos == cctx.blockPos( scanPos ) )
{
break;
}
}
return scanPos;
}
static void check_coeff_conformance(const CoeffCodingContext& cctx, const TCoeff coeff)
{
CHECK( coeff < cctx.minCoeff() || coeff > cctx.maxCoeff(),
"TransCoeffLevel outside allowable range" );
}
void CABACReader::residual_coding_subblock( CoeffCodingContext& cctx, TCoeff* coeff, const int stateTransTable, int& state )
{
// NOTE: All coefficients of the subblock must be set to zero before calling this function
#if RExt__DECODER_DEBUG_BIT_STATISTICS
CodingStatisticsClassType ctype_group ( STATS__CABAC_BITS__SIG_COEFF_GROUP_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_map ( STATS__CABAC_BITS__SIG_COEFF_MAP_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_par ( STATS__CABAC_BITS__PAR_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_gt1 ( STATS__CABAC_BITS__GT1_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_gt2 ( STATS__CABAC_BITS__GT2_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_escs ( STATS__CABAC_BITS__ESCAPE_BITS, cctx.width(), cctx.height(), cctx.compID() );
#endif
//===== init =====
const int minSubPos = cctx.minSubPos();
const bool isLast = cctx.isLast();
int firstSigPos = ( isLast ? cctx.scanPosLast() : cctx.maxSubPos() );
int nextSigPos = firstSigPos;
#if JVET_V0106_RRC_RICE
int baseLevel = cctx.getBaseLevel();
bool updateHistory = cctx.getUpdateHist();
#endif
//===== decode significant_coeffgroup_flag =====
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_group );
bool sigGroup = ( isLast || !minSubPos );
if( !sigGroup )
{
sigGroup = m_BinDecoder.decodeBin( cctx.sigGroupCtxId() );
}
if( sigGroup )
{
cctx.setSigGroup();
}
else
{
return;
}
uint8_t ctxOffset[16];
//===== decode absolute values =====
const int inferSigPos = nextSigPos != cctx.scanPosLast() ? ( cctx.isNotFirst() ? minSubPos : -1 ) : nextSigPos;
int firstNZPos = nextSigPos;
int lastNZPos = -1;
int numNonZero = 0;
int remRegBins = cctx.regBinLimit;
int firstPosMode2 = minSubPos - 1;
int sigBlkPos[ 1 << MLS_CG_SIZE ];
for( ; nextSigPos >= minSubPos && remRegBins >= 4; nextSigPos-- )
{
int blkPos = cctx.blockPos( nextSigPos );
unsigned sigFlag = ( !numNonZero && nextSigPos == inferSigPos );
if( !sigFlag )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_map );
const unsigned sigCtxId = cctx.sigCtxIdAbs( nextSigPos, coeff, state );
sigFlag = m_BinDecoder.decodeBin( sigCtxId );
DTRACE( g_trace_ctx, D_SYNTAX_RESI, "sig_bin() bin=%d ctx=%d\n", sigFlag, sigCtxId );
remRegBins--;
}
else if( nextSigPos != cctx.scanPosLast() )
{
cctx.sigCtxIdAbs( nextSigPos, coeff, state ); // required for setting variables that are needed for gtx/par context selection
}
if( sigFlag )
{
uint8_t& ctxOff = ctxOffset[ nextSigPos - minSubPos ];
ctxOff = cctx.ctxOffsetAbs();
sigBlkPos[ numNonZero++ ] = blkPos;
firstNZPos = nextSigPos;
lastNZPos = std::max<int>( lastNZPos, nextSigPos );
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_gt1 );
unsigned gt1Flag = m_BinDecoder.decodeBin( cctx.greater1CtxIdAbs(ctxOff) );
DTRACE( g_trace_ctx, D_SYNTAX_RESI, "gt1_flag() bin=%d ctx=%d\n", gt1Flag, cctx.greater1CtxIdAbs(ctxOff) );
remRegBins--;
unsigned parFlag = 0;
unsigned gt2Flag = 0;
if( gt1Flag )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_par );
parFlag = m_BinDecoder.decodeBin( cctx.parityCtxIdAbs( ctxOff ) );
DTRACE( g_trace_ctx, D_SYNTAX_RESI, "par_flag() bin=%d ctx=%d\n", parFlag, cctx.parityCtxIdAbs( ctxOff ) );
remRegBins--;
RExt__DECODER_DEBUG_BIT_STATISTICS_SET(ctype_gt2);
gt2Flag = m_BinDecoder.decodeBin( cctx.greater2CtxIdAbs( ctxOff ) );
DTRACE( g_trace_ctx, D_SYNTAX_RESI, "gt2_flag() bin=%d ctx=%d\n", gt2Flag, cctx.greater2CtxIdAbs( ctxOff ) );
remRegBins--;
}
coeff[ blkPos ] += 1 + parFlag + gt1Flag + (gt2Flag << 1);
}
state = ( stateTransTable >> ((state<<2)+((coeff[blkPos]&1)<<1)) ) & 3;
}
firstPosMode2 = nextSigPos;
cctx.regBinLimit = remRegBins;
//===== 2nd PASS: Go-rice codes =====
unsigned ricePar = 0;
for( int scanPos = firstSigPos; scanPos > firstPosMode2; scanPos-- )
{
#if JVET_V0106_RRC_RICE
ricePar = (cctx.*(cctx.deriveRiceRRC))(scanPos, coeff, baseLevel);
#else
int sumAll = cctx.templateAbsSum(scanPos, coeff, 4);
ricePar = g_goRiceParsCoeff[sumAll];
#endif
TCoeff& tcoeff = coeff[ cctx.blockPos( scanPos ) ];
if( tcoeff >= 4 )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_escs );
int rem = m_BinDecoder.decodeRemAbsEP( ricePar, COEF_REMAIN_BIN_REDUCTION, cctx.maxLog2TrDRange() );
DTRACE( g_trace_ctx, D_SYNTAX_RESI, "rem_val() bin=%d ctx=%d\n", rem, ricePar );
tcoeff += (rem<<1);
#if JVET_V0106_RRC_RICE
if ((updateHistory) && (rem > 0))
{
unsigned &riceStats = m_BinDecoder.getCtx().getGRAdaptStats((unsigned)(cctx.compID()));
cctx.updateRiceStat(riceStats, rem, 1);
cctx.setUpdateHist(0);
updateHistory = 0;
}
#endif
}
}
//===== coeff bypass ====
for( int scanPos = firstPosMode2; scanPos >= minSubPos; scanPos-- )
{
#if JVET_V0106_RRC_RICE
int rice = (cctx.*(cctx.deriveRiceRRC))(scanPos, coeff, 0);
#else
int sumAll = cctx.templateAbsSum(scanPos, coeff, 0);
int rice = g_goRiceParsCoeff[sumAll];
#endif
int pos0 = g_goRicePosCoeff0(state, rice);
RExt__DECODER_DEBUG_BIT_STATISTICS_SET(ctype_escs);
int rem = m_BinDecoder.decodeRemAbsEP( rice, COEF_REMAIN_BIN_REDUCTION, cctx.maxLog2TrDRange() );
DTRACE( g_trace_ctx, D_SYNTAX_RESI, "rem_val() bin=%d ctx=%d\n", rem, rice );
TCoeff tcoeff = ( rem == pos0 ? 0 : rem < pos0 ? rem+1 : rem );
state = ( stateTransTable >> ((state<<2)+((tcoeff&1)<<1)) ) & 3;
#if JVET_V0106_RRC_RICE
if ((updateHistory) && (rem > 0))
{
unsigned &riceStats = m_BinDecoder.getCtx().getGRAdaptStats((unsigned)(cctx.compID()));
cctx.updateRiceStat(riceStats, rem, 0);
cctx.setUpdateHist(0);
updateHistory = 0;
}
#endif
if( tcoeff )
{
int blkPos = cctx.blockPos( scanPos );
sigBlkPos[ numNonZero++ ] = blkPos;
firstNZPos = scanPos;
lastNZPos = std::max<int>( lastNZPos, scanPos );
coeff[blkPos] = tcoeff;
}
}
//===== decode sign's =====
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__SIGN_BIT, Size( cctx.width(), cctx.height() ), cctx.compID() );
const unsigned numSigns = ( cctx.hideSign( firstNZPos, lastNZPos ) ? numNonZero - 1 : numNonZero );
unsigned signPattern = m_BinDecoder.decodeBinsEP( numSigns ) << ( 32 - numSigns );
//===== set final coefficents =====
TCoeff sumAbs = 0;
for( unsigned k = 0; k < numSigns; k++ )
{
TCoeff AbsCoeff = coeff[ sigBlkPos[ k ] ];
sumAbs += AbsCoeff;
coeff[ sigBlkPos[k] ] = ( signPattern & ( 1u << 31 ) ? -AbsCoeff : AbsCoeff );
signPattern <<= 1;
check_coeff_conformance( cctx, coeff[ sigBlkPos[k] ] );
}
if( numNonZero > numSigns )
{
int k = numSigns;
TCoeff AbsCoeff = coeff[ sigBlkPos[ k ] ];
sumAbs += AbsCoeff;
coeff[ sigBlkPos[k] ] = ( sumAbs & 1 ? -AbsCoeff : AbsCoeff );
check_coeff_conformance( cctx, coeff[ sigBlkPos[k] ] );
}
}
void CABACReader::residual_codingTS( TransformUnit& tu, ComponentID compID )
{
DTRACE( g_trace_ctx, D_SYNTAX, "residual_codingTS() etype=%d pos=(%d,%d) size=%dx%d\n", tu.blocks[compID].compID, tu.blocks[compID].x, tu.blocks[compID].y, tu.blocks[compID].width, tu.blocks[compID].height );
// init coeff coding context
CoeffCodingContext cctx ( tu, compID, false, isLuma(compID) ? tu.cu->bdpcmMode : tu.cu->bdpcmModeChroma);
TCoeff* coeff = tu.getCoeffs( compID ).buf;
int maxCtxBins = (cctx.maxNumCoeff() * 7) >> 2;
cctx.setNumCtxBins(maxCtxBins);
for( int subSetId = 0; subSetId <= ( cctx.maxNumCoeff() - 1 ) >> cctx.log2CGSize(); subSetId++ )
{
cctx.initSubblock ( subSetId );
#if JVET_V0054_TSRC_RICE
int goRiceParam = 1;
if (tu.cu->slice->getSPS()->getSpsRangeExtension().getTSRCRicePresentFlag() && tu.mtsIdx[compID] == MTS_SKIP)
{
goRiceParam = goRiceParam + tu.cu->slice->get_tsrc_index();
}
residual_coding_subblockTS( cctx, coeff, goRiceParam);
#else
residual_coding_subblockTS( cctx, coeff );
#endif
}
}
#if JVET_V0054_TSRC_RICE
void CABACReader::residual_coding_subblockTS( CoeffCodingContext& cctx, TCoeff* coeff, int riceParam)
#else
void CABACReader::residual_coding_subblockTS( CoeffCodingContext& cctx, TCoeff* coeff )
#endif
{
// NOTE: All coefficients of the subblock must be set to zero before calling this function
#if RExt__DECODER_DEBUG_BIT_STATISTICS
CodingStatisticsClassType ctype_group ( STATS__CABAC_BITS__SIG_COEFF_GROUP_FLAG, cctx.width(), cctx.height(), cctx.compID() );
#if TR_ONLY_COEFF_STATS
CodingStatisticsClassType ctype_map ( STATS__CABAC_BITS__SIG_COEFF_MAP_FLAG_TS, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_par ( STATS__CABAC_BITS__PAR_FLAG_TS, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_gt1 ( STATS__CABAC_BITS__GT1_FLAG_TS, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_gt2 ( STATS__CABAC_BITS__GT2_FLAG_TS, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_escs ( STATS__CABAC_BITS__ESCAPE_BITS_TS, cctx.width(), cctx.height(), cctx.compID() );
#else
CodingStatisticsClassType ctype_map ( STATS__CABAC_BITS__SIG_COEFF_MAP_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_par ( STATS__CABAC_BITS__PAR_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_gt1 ( STATS__CABAC_BITS__GT1_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_gt2 ( STATS__CABAC_BITS__GT2_FLAG, cctx.width(), cctx.height(), cctx.compID() );
CodingStatisticsClassType ctype_escs ( STATS__CABAC_BITS__ESCAPE_BITS, cctx.width(), cctx.height(), cctx.compID() );
#endif
#endif
//===== init =====
const int minSubPos = cctx.maxSubPos();
int firstSigPos = cctx.minSubPos();
int nextSigPos = firstSigPos;
unsigned signPattern = 0;
//===== decode significant_coeffgroup_flag =====
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_group );
bool sigGroup = cctx.isLastSubSet() && cctx.noneSigGroup();
if( !sigGroup )
{
sigGroup = m_BinDecoder.decodeBin(cctx.sigGroupCtxId(true));
DTRACE(g_trace_ctx, D_SYNTAX_RESI, "ts_sigGroup() bin=%d ctx=%d\n", sigGroup, cctx.sigGroupCtxId());
}
if( sigGroup )
{
cctx.setSigGroup();
}
else
{
return;
}
//===== decode absolute values =====
const int inferSigPos = minSubPos;
int numNonZero = 0;
int sigBlkPos[ 1 << MLS_CG_SIZE ];
int lastScanPosPass1 = -1;
int lastScanPosPass2 = -1;
for (; nextSigPos <= minSubPos && cctx.numCtxBins() >= 4; nextSigPos++)
{
int blkPos = cctx.blockPos( nextSigPos );
unsigned sigFlag = ( !numNonZero && nextSigPos == inferSigPos );
if( !sigFlag )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_map );
const unsigned sigCtxId = cctx.sigCtxIdAbsTS(nextSigPos, coeff);
sigFlag = m_BinDecoder.decodeBin(sigCtxId);
DTRACE(g_trace_ctx, D_SYNTAX_RESI, "ts_sig_bin() bin=%d ctx=%d\n", sigFlag, sigCtxId);
cctx.decimateNumCtxBins(1);
}
if( sigFlag )
{
//===== decode sign's =====
#if TR_ONLY_COEFF_STATS
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2(STATS__CABAC_BITS__SIGN_BIT_TS, Size(cctx.width(), cctx.height()), cctx.compID());
#else
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET_SIZE2( STATS__CABAC_BITS__SIGN_BIT, Size( cctx.width(), cctx.height() ), cctx.compID() );
#endif
int sign;
const unsigned signCtxId = cctx.signCtxIdAbsTS(nextSigPos, coeff, cctx.bdpcm());
sign = m_BinDecoder.decodeBin(signCtxId);
cctx.decimateNumCtxBins(1);
signPattern += ( sign << numNonZero );
sigBlkPos[numNonZero++] = blkPos;
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_gt1 );
unsigned gt1Flag;
const unsigned gt1CtxId = cctx.lrg1CtxIdAbsTS(nextSigPos, coeff, cctx.bdpcm());
gt1Flag = m_BinDecoder.decodeBin(gt1CtxId);
DTRACE(g_trace_ctx, D_SYNTAX_RESI, "ts_gt1_flag() bin=%d ctx=%d\n", gt1Flag, gt1CtxId);
cctx.decimateNumCtxBins(1);
unsigned parFlag = 0;
if( gt1Flag )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_par );
parFlag = m_BinDecoder.decodeBin(cctx.parityCtxIdAbsTS());
DTRACE(g_trace_ctx, D_SYNTAX_RESI, "ts_par_flag() bin=%d ctx=%d\n", parFlag, cctx.parityCtxIdAbsTS());
cctx.decimateNumCtxBins(1);
}
coeff[ blkPos ] = (sign ? -1 : 1 ) * (TCoeff)(1 + parFlag + gt1Flag);
}
lastScanPosPass1 = nextSigPos;
}
int cutoffVal = 2;
const int numGtBins = 4;
//===== 2nd PASS: gt2 =====
for (int scanPos = firstSigPos; scanPos <= minSubPos && cctx.numCtxBins() >= 4; scanPos++)
{
TCoeff& tcoeff = coeff[cctx.blockPos(scanPos)];
cutoffVal = 2;
for (int i = 0; i < numGtBins; i++)
{
if( tcoeff < 0)
{
tcoeff = -tcoeff;
}
if (tcoeff >= cutoffVal)
{
RExt__DECODER_DEBUG_BIT_STATISTICS_SET(ctype_gt2);
unsigned gt2Flag;
gt2Flag = m_BinDecoder.decodeBin(cctx.greaterXCtxIdAbsTS(cutoffVal >> 1));
tcoeff += (gt2Flag << 1);
DTRACE(g_trace_ctx, D_SYNTAX_RESI, "ts_gt%d_flag() bin=%d ctx=%d sp=%d coeff=%d\n", i, gt2Flag,
cctx.greaterXCtxIdAbsTS(cutoffVal >> 1), scanPos, tcoeff);
cctx.decimateNumCtxBins(1);
}
cutoffVal += 2;
}
lastScanPosPass2 = scanPos;
}
//===== 3rd PASS: Go-rice codes =====
for( int scanPos = firstSigPos; scanPos <= minSubPos; scanPos++ )
{
TCoeff& tcoeff = coeff[ cctx.blockPos( scanPos ) ];
RExt__DECODER_DEBUG_BIT_STATISTICS_SET( ctype_escs );
cutoffVal = (scanPos <= lastScanPosPass2 ? 10 : (scanPos <= lastScanPosPass1 ? 2 : 0));
if (tcoeff < 0)
{
tcoeff = -tcoeff;
}
if( tcoeff >= cutoffVal )
{
#if JVET_V0054_TSRC_RICE
int rice = riceParam;
#else
int rice = cctx.templateAbsSumTS( scanPos, coeff );
#endif
int rem = m_BinDecoder.decodeRemAbsEP( rice, COEF_REMAIN_BIN_REDUCTION, cctx.maxLog2TrDRange() );
DTRACE( g_trace_ctx, D_SYNTAX_RESI, "ts_rem_val() bin=%d ctx=%d sp=%d\n", rem, rice, scanPos );
tcoeff += (scanPos <= lastScanPosPass1) ? (rem << 1) : rem;
if (tcoeff && scanPos > lastScanPosPass1)
{
int blkPos = cctx.blockPos(scanPos);
int sign = m_BinDecoder.decodeBinEP();
signPattern += (sign << numNonZero);
sigBlkPos[numNonZero++] = blkPos;
}
}
if (!cctx.bdpcm() && cutoffVal)
{
if (tcoeff > 0)
{
int rightPixel, belowPixel;
cctx.neighTS(rightPixel, belowPixel, scanPos, coeff);
tcoeff = cctx.decDeriveModCoeff(rightPixel, belowPixel, tcoeff);
}
}
}
//===== set final coefficents =====
for( unsigned k = 0; k < numNonZero; k++ )
{
TCoeff AbsCoeff = coeff[ sigBlkPos[ k ] ];
coeff[ sigBlkPos[k] ] = ( signPattern & 1 ? -AbsCoeff : AbsCoeff );
signPattern >>= 1;
check_coeff_conformance( cctx, coeff[ sigBlkPos[k] ] );
}
}
//================================================================================
// helper functions
//--------------------------------------------------------------------------------
// unsigned unary_max_symbol ( ctxId0, ctxId1, maxSymbol )
// unsigned unary_max_eqprob ( maxSymbol )
// unsigned exp_golomb_eqprob( count )
//================================================================================
unsigned CABACReader::unary_max_symbol( unsigned ctxId0, unsigned ctxIdN, unsigned maxSymbol )
{
unsigned onesRead = 0;
while( onesRead < maxSymbol && m_BinDecoder.decodeBin( onesRead == 0 ? ctxId0 : ctxIdN ) == 1 )
{
++onesRead;
}
return onesRead;
}
unsigned CABACReader::unary_max_eqprob( unsigned maxSymbol )
{
for( unsigned k = 0; k < maxSymbol; k++ )
{
if( !m_BinDecoder.decodeBinEP() )
{
return k;
}
}
return maxSymbol;
}
unsigned CABACReader::exp_golomb_eqprob( unsigned count )
{
unsigned symbol = 0;
unsigned bit = 1;
while( bit )
{
bit = m_BinDecoder.decodeBinEP( );
symbol += bit << count++;
}
if( --count )
{
symbol += m_BinDecoder.decodeBinsEP( count );
}
return symbol;
}
unsigned CABACReader::code_unary_fixed( unsigned ctxId, unsigned unary_max, unsigned fixed )
{
unsigned idx;
bool unary = m_BinDecoder.decodeBin( ctxId );
if( unary )
{
idx = unary_max_eqprob( unary_max );
}
else
{
idx = unary_max + 1 + m_BinDecoder.decodeBinsEP( fixed );
}
return idx;
}
void CABACReader::mip_flag( CodingUnit& cu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__OTHER );
if( !cu.Y().valid() )
{
return;
}
if( !cu.cs->sps->getUseMIP() )
{
cu.mipFlag = false;
return;
}
unsigned ctxId = DeriveCtx::CtxMipFlag( cu );
cu.mipFlag = m_BinDecoder.decodeBin( Ctx::MipFlag( ctxId ) );
DTRACE( g_trace_ctx, D_SYNTAX, "mip_flag() pos=(%d,%d) mode=%d\n", cu.lumaPos().x, cu.lumaPos().y, cu.mipFlag ? 1 : 0 );
}
void CABACReader::mip_pred_modes( CodingUnit &cu )
{
RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__OTHER );
if( !cu.Y().valid() )
{
return;
}
for( auto &pu : CU::traversePUs( cu ) )
{
mip_pred_mode( pu );
}
}
void CABACReader::mip_pred_mode( PredictionUnit &pu )
{
pu.mipTransposedFlag = bool(m_BinDecoder.decodeBinEP());
uint32_t mipMode;
const int numModes = getNumModesMip( pu.Y() );
xReadTruncBinCode( mipMode, numModes );
pu.intraDir[CHANNEL_TYPE_LUMA] = mipMode;
CHECKD( pu.intraDir[CHANNEL_TYPE_LUMA] < 0 || pu.intraDir[CHANNEL_TYPE_LUMA] >= numModes, "Invalid MIP mode" );
DTRACE( g_trace_ctx, D_SYNTAX, "mip_pred_mode() pos=(%d,%d) mode=%d transposed=%d\n", pu.lumaPos().x, pu.lumaPos().y, pu.intraDir[CHANNEL_TYPE_LUMA], pu.mipTransposedFlag ? 1 : 0 );
}