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127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/*
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Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net )
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Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org )
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License version 2.1 as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __BITTREECODER_H
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#define __BITTREECODER_H
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#include "aribitcd.h"
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#include "rcdefs.h"
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//////////////////////////
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// CBitTreeDecoder
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template <int aNumMoveBits, UINT32 m_NumBitLevels>
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class CBitTreeDecoder
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{
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CMyBitDecoder<aNumMoveBits> m_Models[1 << m_NumBitLevels];
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public:
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void Init()
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{
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for(UINT32 i = 1; i < (1 << m_NumBitLevels); i++)
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m_Models[i].Init();
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}
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UINT32 Decode(CMyRangeDecoder *aRangeDecoder)
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{
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UINT32 aModelIndex = 1;
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RC_INIT_VAR
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for(UINT32 aBitIndex = m_NumBitLevels; aBitIndex > 0; aBitIndex--)
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{
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// aModelIndex = (aModelIndex << 1) + m_Models[aModelIndex].Decode(aRangeDecoder);
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RC_GETBIT(aNumMoveBits, m_Models[aModelIndex].m_Probability, aModelIndex)
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}
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RC_FLUSH_VAR
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return aModelIndex - (1 << m_NumBitLevels);
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};
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};
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////////////////////////////////
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// CReverseBitTreeDecoder
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template <int aNumMoveBits>
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class CReverseBitTreeDecoder2
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{
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CMyBitDecoder<aNumMoveBits> *m_Models;
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UINT32 m_NumBitLevels;
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public:
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CReverseBitTreeDecoder2(): m_Models(0) { }
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~CReverseBitTreeDecoder2() { delete []m_Models; }
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bool Create(UINT32 aNumBitLevels)
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{
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m_NumBitLevels = aNumBitLevels;
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m_Models = new CMyBitDecoder<aNumMoveBits>[1 << aNumBitLevels];
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return (m_Models != 0);
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}
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void Init()
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{
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UINT32 aNumModels = 1 << m_NumBitLevels;
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for(UINT32 i = 1; i < aNumModels; i++)
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m_Models[i].Init();
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}
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UINT32 Decode(CMyRangeDecoder *aRangeDecoder)
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{
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UINT32 aModelIndex = 1;
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UINT32 aSymbol = 0;
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RC_INIT_VAR
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for(UINT32 aBitIndex = 0; aBitIndex < m_NumBitLevels; aBitIndex++)
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{
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// UINT32 aBit = m_Models[aModelIndex].Decode(aRangeDecoder);
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// aModelIndex <<= 1;
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// aModelIndex += aBit;
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// aSymbol |= (aBit << aBitIndex);
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RC_GETBIT2(aNumMoveBits, m_Models[aModelIndex].m_Probability, aModelIndex, ; , aSymbol |= (1 << aBitIndex))
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}
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RC_FLUSH_VAR
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return aSymbol;
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};
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};
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////////////////////////////
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// CReverseBitTreeDecoder2
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template <int aNumMoveBits, UINT32 m_NumBitLevels>
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class CReverseBitTreeDecoder
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{
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CMyBitDecoder<aNumMoveBits> m_Models[1 << m_NumBitLevels];
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public:
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void Init()
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{
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for(UINT32 i = 1; i < (1 << m_NumBitLevels); i++)
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m_Models[i].Init();
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}
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UINT32 Decode(CMyRangeDecoder *aRangeDecoder)
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{
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UINT32 aModelIndex = 1;
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UINT32 aSymbol = 0;
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RC_INIT_VAR
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for(UINT32 aBitIndex = 0; aBitIndex < m_NumBitLevels; aBitIndex++)
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{
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// UINT32 aBit = m_Models[aModelIndex].Decode(aRangeDecoder);
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// aModelIndex <<= 1;
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// aModelIndex += aBit;
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// aSymbol |= (aBit << aBitIndex);
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RC_GETBIT2(aNumMoveBits, m_Models[aModelIndex].m_Probability, aModelIndex, ; , aSymbol |= (1 << aBitIndex))
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}
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RC_FLUSH_VAR
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return aSymbol;
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}
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};
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#endif
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