protected int DecodeERISACodeIndex (ErisaProbModel pModel)
{
uint dwAcc = m_dwCodeRegister * pModel.TotalCount / m_dwAugendRegister;
if (dwAcc >= ErisaProbModel.TotalLimit)
{
return -1;
}
int iSym = 0;
ushort wAcc = (ushort)dwAcc;
ushort wFs = 0;
ushort wOccured;
for (;;)
{
wOccured = pModel.SymTable[iSym].Occured;
if (wAcc < wOccured)
break;
wAcc -= wOccured;
wFs += wOccured;
if (++iSym >= pModel.SymbolSorts)
return -1;
}
m_dwCodeRegister -= (m_dwAugendRegister * wFs + pModel.TotalCount - 1) / pModel.TotalCount;
m_dwAugendRegister = m_dwAugendRegister * wOccured / pModel.TotalCount;
Debug.Assert (m_dwAugendRegister != 0);
while (0 == (m_dwAugendRegister & 0x8000))
{
int nNextBit = GetABit();
if (1 == nNextBit)
{
if ((++m_nPostBitCount) >= 256)
return -1;
nNextBit = 0;
}
m_dwCodeRegister = (m_dwCodeRegister << 1) | ((uint)nNextBit & 1);
m_dwAugendRegister <<= 1;
}
m_dwCodeRegister &= 0xFFFF;
return iSym;
}
public int DecodeERISACode (ErisaProbModel pModel)
{
int iSym = DecodeERISACodeIndex (pModel);
int nSymbol = ErisaProbModel.EscCode;
if (iSym >= 0)
{
nSymbol = pModel.SymTable[iSym].Symbol;
pModel.IncreaseSymbol (iSym);
}
return nSymbol;
}
uint DecodeERISACodeBytes (sbyte[] ptrDst, uint nCount)
{
var pProb = m_pLastERISAProb;
int nSymbol, iSym;
uint i = 0;
while (i < nCount)
{
if (m_nLength > 0)
{
uint nCurrent = nCount - i;
if (nCurrent > m_nLength)
nCurrent = m_nLength;
m_nLength -= nCurrent;
for (uint j = 0; j < nCurrent; j++)
{
ptrDst[i++] = 0;
}
continue;
}
iSym = DecodeERISACodeIndex (pProb);
if (iSym < 0)
break;
nSymbol = pProb.SymTable[iSym].Symbol;
pProb.IncreaseSymbol (iSym);
ptrDst[i++] = (sbyte)nSymbol;
if (0 == nSymbol)
{
iSym = DecodeERISACodeIndex (m_pRunLenProb);
if (iSym < 0)
break;
m_nLength = (uint)m_pRunLenProb.SymTable[iSym].Symbol;
m_pRunLenProb.IncreaseSymbol (iSym);
}
pProb = m_ppTableERISA[nSymbol & 0xFF];
}
m_pLastERISAProb = pProb;
return i;
}
public void PrepareToDecodeERISACode ()
{
if (null == m_ppTableERISA)
{
m_ppTableERISA = new ErisaProbModel[0x101];
for (int i = 0; i < 0x101; ++i)
{
m_ppTableERISA[i] = new ErisaProbModel();
m_ppTableERISA[i].Initialize();
}
}
m_pLastERISAProb = m_ppTableERISA[0];
m_pPhraseLenProb.Initialize();
m_pPhraseIndexProb.Initialize();
m_pRunLenProb.Initialize();
InitializeERISACode();
}
private void InitializeLossy ()
{
if (3 != m_info.BlockingDegree)
throw new InvalidFormatException();
m_nBlockSize = 1 << m_info.BlockingDegree;
m_nBlockArea = 1 << (m_info.BlockingDegree * 2);
m_nBlockSamples = m_nBlockArea * m_nChannelCount;
m_nWidthBlocks = ((int)m_info.Width + m_nBlockSize * 2 - 1) >> (m_info.BlockingDegree + 1);
m_nHeightBlocks = ((int)m_info.Height + m_nBlockSize * 2 - 1) >> (m_info.BlockingDegree + 1);
if (CvType.LOT_ERI == m_info.Transformation)
{
++m_nWidthBlocks;
++m_nHeightBlocks;
}
if (EriSampling.YUV_4_4_4 == m_info.SamplingFlags)
{
m_nBlocksetCount = m_nChannelCount * 4;
}
else if (EriSampling.YUV_4_1_1 == m_info.SamplingFlags)
{
switch (m_nChannelCount)
{
case 1:
m_nBlocksetCount = 4;
break;
case 3:
m_nBlocksetCount = 6;
break;
case 4:
m_nBlocksetCount = 10;
break;
default:
throw new InvalidFormatException();
}
}
else
throw new InvalidFormatException();
m_ptrDecodeBuf = new sbyte[m_nBlockArea * 16];
m_ptrVertBufLOT = new float[m_nBlockSamples * 2 * m_nWidthBlocks];
m_ptrHorzBufLOT = new float[m_nBlockSamples * 2];
m_ptrBlocksetBuf = new float[16][];
m_ptrMatrixBuf = new float[m_nBlockArea * 16];
m_ptrIQParamBuf = new float[m_nBlockArea * 2];
m_ptrIQParamTable = new byte[m_nBlockArea * 2];
int dwTotalBlocks = m_nWidthBlocks * m_nHeightBlocks;
m_ptrLossyOps = new sbyte[dwTotalBlocks * 2];
m_ptrImageBuf = new sbyte[dwTotalBlocks * m_nBlockArea * m_nBlocksetCount];
m_ptrMovingVector = new sbyte[dwTotalBlocks * 4];
m_ptrMoveVecFlags = new sbyte[dwTotalBlocks];
m_ptrMovePrevBlocks = new int[dwTotalBlocks * 4];
for (int i = 0; i < 16; i ++)
{
m_ptrBlocksetBuf[i] = new float[m_nBlockArea];
}
m_nYUVPixelBytes = m_nChannelCount;
if (3 == m_nYUVPixelBytes)
{
m_nYUVPixelBytes = 4;
}
m_nYUVLineBytes = ((m_nYUVPixelBytes * m_nWidthBlocks * m_nBlockSize * 2) + 0xF) & (~0xF);
int nYUVImageSize = m_nYUVLineBytes * m_nHeightBlocks * m_nBlockSize * 2;
m_ptrBlockLineBuf = new sbyte[m_nYUVLineBytes * 16];
m_ptrYUVImage = new sbyte[nYUVImageSize];
InitializeZigZagTable();
m_pHuffmanTree = new HuffmanTree();
m_pProbERISA = new ErisaProbModel();
m_context = new HuffmanDecodeContext (0x10000);
}
private void InitializeLossless ()
{
if (0 != m_info.BlockingDegree)
{
m_nBlockSize = 1 << m_info.BlockingDegree;
m_nBlockArea = 1 << (m_info.BlockingDegree * 2);
m_nBlockSamples = m_nBlockArea * m_nChannelCount;
m_nWidthBlocks = ((int)m_info.Width + m_nBlockSize - 1) >> m_info.BlockingDegree;
m_nHeightBlocks = ((int)m_info.Height + m_nBlockSize - 1) >> m_info.BlockingDegree;
m_ptrOperations = new byte[m_nWidthBlocks * m_nHeightBlocks];
m_ptrColumnBuf = new sbyte[m_nBlockSize * m_nChannelCount];
m_ptrLineBuf = new sbyte[m_nChannelCount * (m_nWidthBlocks << m_info.BlockingDegree)];
m_ptrDecodeBuf = new sbyte[m_nBlockSamples];
m_ptrArrangeBuf = new sbyte[m_nBlockSamples];
InitializeArrangeTable();
}
if (0x00020200 == m_info.Version)
{
if (EriCode.RunlengthHuffman == m_info.Architecture)
{
m_pHuffmanTree = new HuffmanTree();
}
else if (EriCode.Nemesis == m_info.Architecture)
{
m_pProbERISA = new ErisaProbModel();
}
}
if (EriCode.RunlengthHuffman == m_info.Architecture)
m_context = new HuffmanDecodeContext (0x10000);
else if (EriCode.Nemesis == m_info.Architecture)
m_context = new ProbDecodeContext (0x10000);
else
m_context = new RLEDecodeContext (0x10000);
}
