mirror of https://github.com/snes9xgit/snes9x.git
127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/*
|
|
Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net )
|
|
Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org )
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License version 2.1 as published by the Free Software Foundation.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef __BITTREECODER_H
|
|
#define __BITTREECODER_H
|
|
|
|
#include "aribitcd.h"
|
|
#include "rcdefs.h"
|
|
|
|
|
|
//////////////////////////
|
|
// CBitTreeDecoder
|
|
|
|
template <int aNumMoveBits, UINT32 m_NumBitLevels>
|
|
class CBitTreeDecoder
|
|
{
|
|
CMyBitDecoder<aNumMoveBits> m_Models[1 << m_NumBitLevels];
|
|
public:
|
|
void Init()
|
|
{
|
|
for(UINT32 i = 1; i < (1 << m_NumBitLevels); i++)
|
|
m_Models[i].Init();
|
|
}
|
|
UINT32 Decode(CMyRangeDecoder *aRangeDecoder)
|
|
{
|
|
UINT32 aModelIndex = 1;
|
|
RC_INIT_VAR
|
|
for(UINT32 aBitIndex = m_NumBitLevels; aBitIndex > 0; aBitIndex--)
|
|
{
|
|
// aModelIndex = (aModelIndex << 1) + m_Models[aModelIndex].Decode(aRangeDecoder);
|
|
RC_GETBIT(aNumMoveBits, m_Models[aModelIndex].m_Probability, aModelIndex)
|
|
}
|
|
RC_FLUSH_VAR
|
|
return aModelIndex - (1 << m_NumBitLevels);
|
|
};
|
|
};
|
|
|
|
////////////////////////////////
|
|
// CReverseBitTreeDecoder
|
|
|
|
template <int aNumMoveBits>
|
|
class CReverseBitTreeDecoder2
|
|
{
|
|
CMyBitDecoder<aNumMoveBits> *m_Models;
|
|
UINT32 m_NumBitLevels;
|
|
public:
|
|
CReverseBitTreeDecoder2(): m_Models(0) { }
|
|
~CReverseBitTreeDecoder2() { delete []m_Models; }
|
|
bool Create(UINT32 aNumBitLevels)
|
|
{
|
|
m_NumBitLevels = aNumBitLevels;
|
|
m_Models = new CMyBitDecoder<aNumMoveBits>[1 << aNumBitLevels];
|
|
return (m_Models != 0);
|
|
}
|
|
void Init()
|
|
{
|
|
UINT32 aNumModels = 1 << m_NumBitLevels;
|
|
for(UINT32 i = 1; i < aNumModels; i++)
|
|
m_Models[i].Init();
|
|
}
|
|
UINT32 Decode(CMyRangeDecoder *aRangeDecoder)
|
|
{
|
|
UINT32 aModelIndex = 1;
|
|
UINT32 aSymbol = 0;
|
|
RC_INIT_VAR
|
|
for(UINT32 aBitIndex = 0; aBitIndex < m_NumBitLevels; aBitIndex++)
|
|
{
|
|
// UINT32 aBit = m_Models[aModelIndex].Decode(aRangeDecoder);
|
|
// aModelIndex <<= 1;
|
|
// aModelIndex += aBit;
|
|
// aSymbol |= (aBit << aBitIndex);
|
|
RC_GETBIT2(aNumMoveBits, m_Models[aModelIndex].m_Probability, aModelIndex, ; , aSymbol |= (1 << aBitIndex))
|
|
}
|
|
RC_FLUSH_VAR
|
|
return aSymbol;
|
|
};
|
|
};
|
|
////////////////////////////
|
|
// CReverseBitTreeDecoder2
|
|
|
|
template <int aNumMoveBits, UINT32 m_NumBitLevels>
|
|
class CReverseBitTreeDecoder
|
|
{
|
|
CMyBitDecoder<aNumMoveBits> m_Models[1 << m_NumBitLevels];
|
|
public:
|
|
void Init()
|
|
{
|
|
for(UINT32 i = 1; i < (1 << m_NumBitLevels); i++)
|
|
m_Models[i].Init();
|
|
}
|
|
UINT32 Decode(CMyRangeDecoder *aRangeDecoder)
|
|
{
|
|
UINT32 aModelIndex = 1;
|
|
UINT32 aSymbol = 0;
|
|
RC_INIT_VAR
|
|
for(UINT32 aBitIndex = 0; aBitIndex < m_NumBitLevels; aBitIndex++)
|
|
{
|
|
// UINT32 aBit = m_Models[aModelIndex].Decode(aRangeDecoder);
|
|
// aModelIndex <<= 1;
|
|
// aModelIndex += aBit;
|
|
// aSymbol |= (aBit << aBitIndex);
|
|
RC_GETBIT2(aNumMoveBits, m_Models[aModelIndex].m_Probability, aModelIndex, ; , aSymbol |= (1 << aBitIndex))
|
|
}
|
|
RC_FLUSH_VAR
|
|
return aSymbol;
|
|
}
|
|
};
|
|
|
|
|
|
|
|
#endif
|