Esempio n. 1
0
        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;
        }
Esempio n. 2
0
 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;
 }
Esempio n. 3
0
        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;
        }
Esempio n. 4
0
        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();
        }
Esempio n. 5
0
        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);
        }
Esempio n. 6
0
        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);
        }