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BinEncoder.cpp 13.58 KiB
/* 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) 2010-2019, ITU/ISO/IEC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* 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.
* * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
* 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
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "BinEncoder.h"
#include "CommonLib/Rom.h"
#include "CommonLib/dtrace_next.h"
BinCounter::BinCounter()
: m_CtxBinsCodedBuffer( Ctx::NumberOfContexts )
, m_NumBinsCtx ( m_CtxBinsCodedBuffer.data() )
, m_NumBinsEP ( 0 )
, m_NumBinsTrm ( 0 )
{}
void BinCounter::reset()
{
for( std::size_t k = 0; k < m_CtxBinsCodedBuffer.size(); k++ )
{
m_NumBinsCtx[k] = 0;
}
m_NumBinsEP = 0;
m_NumBinsTrm = 0;
}
uint32_t BinCounter::getAll() const
{
uint32_t count = m_NumBinsEP + m_NumBinsTrm;
for( std::size_t k = 0; k < m_CtxBinsCodedBuffer.size(); k++ )
{
count += m_NumBinsCtx[k];
}
return count;
}
template <class BinProbModel>
BinEncoderBase::BinEncoderBase( const BinProbModel* dummy )
: BinEncIf ( dummy )
, m_Bitstream ( 0 )
, m_Low ( 0 )
, m_Range ( 0 )
, m_bufferedByte ( 0 )
, m_numBufferedBytes( 0 )
, m_bitsLeft ( 0 )
{}
void BinEncoderBase::init( OutputBitstream* bitstream )
{
m_Bitstream = bitstream;
}
void BinEncoderBase::uninit()
{
m_Bitstream = 0;
}
void BinEncoderBase::start()
{
m_Low = 0;
m_Range = 510;
m_bufferedByte = 0xff;
m_numBufferedBytes = 0;
m_bitsLeft = 23;
BinCounter::reset();
m_BinStore. reset();
}
void BinEncoderBase::finish()
{
if( m_Low >> ( 32 - m_bitsLeft ) )
{
m_Bitstream->write( m_bufferedByte + 1, 8 );
while( m_numBufferedBytes > 1 )
{
m_Bitstream->write( 0x00, 8 );
m_numBufferedBytes--;
}
m_Low -= 1 << ( 32 - m_bitsLeft );
}
else
{
if( m_numBufferedBytes > 0 )
{
m_Bitstream->write( m_bufferedByte, 8 );
}
while( m_numBufferedBytes > 1 )
{
m_Bitstream->write( 0xff, 8 );
m_numBufferedBytes--;
}
}
m_Bitstream->write( m_Low >> 8, 24 - m_bitsLeft );
}
void BinEncoderBase::restart()
{
m_Low = 0;
m_Range = 510;
m_bufferedByte = 0xff;
m_numBufferedBytes = 0;
m_bitsLeft = 23;
}
void BinEncoderBase::reset( int qp, int initId )
{
Ctx::init( qp, initId );
start();
}
void BinEncoderBase::resetBits()
{
m_Low = 0;
m_bufferedByte = 0xff;
m_numBufferedBytes = 0;
m_bitsLeft = 23;
BinCounter::reset();
}
void BinEncoderBase::encodeBinEP( unsigned bin )
{
DTRACE( g_trace_ctx, D_CABAC, "%d" " " "%d" " EP=%d \n", DTRACE_GET_COUNTER( g_trace_ctx, D_CABAC ), m_Range, bin );
BinCounter::addEP();
m_Low <<= 1;
if( bin )
{
m_Low += m_Range;
}
m_bitsLeft--;
if( m_bitsLeft < 12 )
{
writeOut();
}
}
void BinEncoderBase::encodeBinsEP( unsigned bins, unsigned numBins )
{
for(int i = 0; i < numBins; i++)
{
DTRACE( g_trace_ctx, D_CABAC, "%d" " " "%d" " EP=%d \n", DTRACE_GET_COUNTER( g_trace_ctx, D_CABAC ), m_Range, ( bins >> ( numBins - 1 - i ) ) & 1 );
}
BinCounter::addEP( numBins );
if( m_Range == 256 )
{
encodeAlignedBinsEP( bins, numBins );
return;
}
while( numBins > 8 )
{
numBins -= 8;
unsigned pattern = bins >> numBins;
m_Low <<= 8;
m_Low += m_Range * pattern;
bins -= pattern << numBins;
m_bitsLeft -= 8;
if( m_bitsLeft < 12 )
{
writeOut();
}
}
m_Low <<= numBins;
m_Low += m_Range * bins;
m_bitsLeft -= numBins;
if( m_bitsLeft < 12 )
{
writeOut();
}
}
void BinEncoderBase::encodeRemAbsEP( unsigned bins, unsigned goRicePar, bool useLimitedPrefixLength, int maxLog2TrDynamicRange )
{
const unsigned threshold = COEF_REMAIN_BIN_REDUCTION << goRicePar; useLimitedPrefixLength = true;
if( bins < threshold )
{
const unsigned bitMask = ( 1 << goRicePar ) - 1;
const unsigned length = ( bins >> goRicePar ) + 1;
encodeBinsEP( ( 1 << length ) - 2, length );
encodeBinsEP( bins & bitMask, goRicePar);
}
else if (useLimitedPrefixLength)
{
const unsigned maxPrefixLength = 32 - COEF_REMAIN_BIN_REDUCTION - maxLog2TrDynamicRange;
unsigned prefixLength = 0;
unsigned codeValue = ( bins >> goRicePar ) - COEF_REMAIN_BIN_REDUCTION;
unsigned suffixLength;
if( codeValue >= ( ( 1 << maxPrefixLength ) - 1 ) )
{
prefixLength = maxPrefixLength;
suffixLength = maxLog2TrDynamicRange;
}
else
{
while( codeValue > ( ( 2 << prefixLength ) - 2 ) )
{
prefixLength++;
}
suffixLength = prefixLength + goRicePar + 1; //+1 for the separator bit
}
const unsigned totalPrefixLength = prefixLength + COEF_REMAIN_BIN_REDUCTION;
const unsigned bitMask = ( 1 << goRicePar ) - 1;
const unsigned prefix = ( 1 << totalPrefixLength ) - 1;
const unsigned suffix = ( ( codeValue - ( (1 << prefixLength ) - 1 ) ) << goRicePar ) | ( bins & bitMask );
encodeBinsEP( prefix, totalPrefixLength ); //prefix
encodeBinsEP( suffix, suffixLength ); //separator, suffix, and rParam bits
}
else
{
unsigned length = goRicePar;
unsigned delta = 1 << length;
bins -= threshold;
while (bins >= delta )
{
bins -= delta;
delta = 1 << (++length);
}
unsigned numBin = COEF_REMAIN_BIN_REDUCTION + length + 1 - goRicePar;
encodeBinsEP( ( 1 << numBin ) - 2, numBin );
encodeBinsEP( bins, length );
}
}
void BinEncoderBase::encodeBinTrm( unsigned bin )
{
BinCounter::addTrm();
m_Range -= 2;
if( bin )
{
m_Low += m_Range;
m_Low <<= 7;
m_Range = 2 << 7;
m_bitsLeft -= 7;
}
else if( m_Range >= 256 )
{
return;
}
else
{
m_Low <<= 1;
m_Range <<= 1;
m_bitsLeft--; }
if( m_bitsLeft < 12 )
{
writeOut();
}
}
void BinEncoderBase::encodeBinsPCM( unsigned bins, unsigned numBins )
{
m_Bitstream->write( bins, numBins );
}
void BinEncoderBase::align()
{
m_Range = 256;
}
void BinEncoderBase::pcmAlignBits()
{
finish();
m_Bitstream->write( 1, 1 );
m_Bitstream->writeAlignZero(); // pcm align zero
}
void BinEncoderBase::encodeAlignedBinsEP( unsigned bins, unsigned numBins )
{
unsigned remBins = numBins;
while( remBins > 0 )
{
//The process of encoding an EP bin is the same as that of coding a normal
//bin where the symbol ranges for 1 and 0 are both half the range:
//
// low = (low + range/2) << 1 (to encode a 1)
// low = low << 1 (to encode a 0)
//
// i.e.
// low = (low + (bin * range/2)) << 1
//
// which is equivalent to:
//
// low = (low << 1) + (bin * range)
//
// this can be generalised for multiple bins, producing the following expression:
//
unsigned binsToCode = std::min<unsigned>( remBins, 8); //code bytes if able to take advantage of the system's byte-write function
unsigned binMask = ( 1 << binsToCode ) - 1;
unsigned newBins = ( bins >> ( remBins - binsToCode ) ) & binMask;
m_Low = ( m_Low << binsToCode ) + ( newBins << 8 ); //range is known to be 256
remBins -= binsToCode;
m_bitsLeft -= binsToCode;
if( m_bitsLeft < 12 )
{
writeOut();
}
}
}
void BinEncoderBase::writeOut()
{
unsigned leadByte = m_Low >> ( 24 - m_bitsLeft );
m_bitsLeft += 8;
m_Low &= 0xffffffffu >> m_bitsLeft;
if( leadByte == 0xff )
{
m_numBufferedBytes++;
}
else
{
if( m_numBufferedBytes > 0 )
{ unsigned carry = leadByte >> 8;
unsigned byte = m_bufferedByte + carry;
m_bufferedByte = leadByte & 0xff;
m_Bitstream->write( byte, 8 );
byte = ( 0xff + carry ) & 0xff;
while( m_numBufferedBytes > 1 )
{
m_Bitstream->write( byte, 8 );
m_numBufferedBytes--;
}
}
else
{
m_numBufferedBytes = 1;
m_bufferedByte = leadByte;
}
}
}
template <class BinProbModel>
TBinEncoder<BinProbModel>::TBinEncoder()
: BinEncoderBase( static_cast<const BinProbModel*> ( nullptr ) )
, m_Ctx ( static_cast<CtxStore<BinProbModel>&>( *this ) )
{}
template <class BinProbModel>
void TBinEncoder<BinProbModel>::encodeBin( unsigned bin, unsigned ctxId )
{
BinCounter::addCtx( ctxId );
BinProbModel& rcProbModel = m_Ctx[ctxId];
uint32_t LPS = rcProbModel.getLPS( m_Range );
DTRACE( g_trace_ctx, D_CABAC, "%d" " %d " "%d" " " "[%d:%d]" " " "%2d(MPS=%d)" " " " - " "%d" "\n", DTRACE_GET_COUNTER( g_trace_ctx, D_CABAC ), ctxId, m_Range, m_Range - LPS, LPS, ( unsigned int ) ( rcProbModel.state() ), bin == rcProbModel.mps(), bin );
m_Range -= LPS;
if( bin != rcProbModel.mps() )
{
int numBits = rcProbModel.getRenormBitsLPS( LPS );
m_bitsLeft -= numBits;
m_Low += m_Range;
m_Low = m_Low << numBits;
m_Range = LPS << numBits;
if( m_bitsLeft < 12 )
{
writeOut();
}
}
else
{
if( m_Range < 256 )
{
int numBits = rcProbModel.getRenormBitsRange( m_Range );
m_bitsLeft -= numBits;
m_Low <<= numBits;
m_Range <<= numBits;
if( m_bitsLeft < 12 )
{
writeOut();
}
}
}
rcProbModel.update( bin );
BinEncoderBase::m_BinStore.addBin( bin, ctxId );
}
template <class BinProbModel>
BinEncIf* TBinEncoder<BinProbModel>::getTestBinEncoder() const
{ BinEncIf* testBinEncoder = 0;
if( m_BinStore.inUse() )
{
testBinEncoder = new TBinEncoder<BinProbModel>();
}
return testBinEncoder;
}
template <class BinProbModel>
BitEstimatorBase::BitEstimatorBase( const BinProbModel* dummy )
: BinEncIf ( dummy )
{
m_EstFracBits = 0;
}
void BitEstimatorBase::encodeRemAbsEP( unsigned bins, unsigned goRicePar, bool useLimitedPrefixLength, int maxLog2TrDynamicRange )
{
const unsigned threshold = COEF_REMAIN_BIN_REDUCTION << goRicePar;
useLimitedPrefixLength = true;
if( bins < threshold )
{
m_EstFracBits += BinProbModelBase::estFracBitsEP( ( bins >> goRicePar ) + 1 + goRicePar );
}
else if (useLimitedPrefixLength)
{
const unsigned maxPrefixLength = 32 - COEF_REMAIN_BIN_REDUCTION - maxLog2TrDynamicRange;
unsigned prefixLength = 0;
unsigned codeValue = ( bins >> goRicePar ) - COEF_REMAIN_BIN_REDUCTION;
unsigned suffixLength;
if( codeValue >= ( ( 1 << maxPrefixLength ) - 1 ) )
{
prefixLength = maxPrefixLength;
suffixLength = maxLog2TrDynamicRange;
}
else
{
while( codeValue > ( ( 2 << prefixLength ) - 2 ) )
{
prefixLength++;
}
suffixLength = prefixLength + goRicePar + 1; //+1 for the separator bit
}
m_EstFracBits += BinProbModelBase::estFracBitsEP( COEF_REMAIN_BIN_REDUCTION + prefixLength + suffixLength );
}
else
{
unsigned length = goRicePar;
unsigned delta = 1 << length;
bins -= threshold;
while (bins >= delta )
{
bins -= delta;
delta = 1 << (++length);
}
m_EstFracBits += BinProbModelBase::estFracBitsEP(COEF_REMAIN_BIN_REDUCTION + 1 + (length << 1) - goRicePar);
}
}
void BitEstimatorBase::align()
{
static const uint64_t add = BinProbModelBase::estFracBitsEP() - 1;
static const uint64_t mask = ~add;
m_EstFracBits += add;
m_EstFracBits &= mask;
}
void BitEstimatorBase::pcmAlignBits()
{
uint64_t numCurrBits = ( m_EstFracBits >> SCALE_BITS );
uint64_t filledBytes = ( numCurrBits + 8 ) >> 3; // including aligned_one_bit and aligned_zero_bits
unsigned bitsToAdd = unsigned( ( filledBytes << 3 ) - numCurrBits );
m_EstFracBits += BinProbModelBase::estFracBitsEP( bitsToAdd );
}
template <class BinProbModel>
TBitEstimator<BinProbModel>::TBitEstimator()
: BitEstimatorBase ( static_cast<const BinProbModel*> ( nullptr) )
, m_Ctx ( static_cast<CtxStore<BinProbModel>&>( *this ) )
{}
template class TBinEncoder<BinProbModel_Std>;
template class TBitEstimator<BinProbModel_Std>;