// ***************************************************************************** // E R I S A - L i b r a r y // ----------------------------------------------------------------------------- // Copyright (C) 2002-2007 Leshade Entis, Entis-soft. All rights reserved. // ***************************************************************************** // // C# port by morkt // using System; using System.Diagnostics; using GameRes.Utility; namespace GameRes.Formats.Entis { internal class MioInfoHeader { public int Version; public CvType Transformation; public EriCode Architecture; public int ChannelCount; public uint SamplesPerSec; public uint BlocksetCount; public int SubbandDegree; public uint AllSampleCount; public uint LappedDegree; public uint BitsPerSample; } internal class MioDataHeader { public byte Version; public byte Flags; public uint SampleCount; } internal struct EriSinCos { public float rSin; public float rCos; } internal class MioDecoder { MioInfoHeader m_mioih; uint m_nBufLength = 0; int[] m_ptrBuffer1; int[] m_ptrBuffer2; sbyte[] m_ptrBuffer3; byte[] m_ptrBuffer4; byte[] m_ptrDivisionTable; byte[] m_ptrRevolveCode; int[] m_ptrWeightCode; int[] m_ptrCoefficient; float[] m_ptrMatrixBuf; float[] m_ptrInternalBuf; float[] m_ptrWorkBuf; float[] m_ptrWeightTable; float[] m_ptrLastDCT; int m_ptrNextDivision; int m_ptrNextRevCode; int m_ptrNextWeight; int m_ptrNextCoefficient; int m_ptrNextSource; int m_ptrLastDCTBuf; int m_nSubbandDegree; int m_nDegreeNum; EriSinCos[] m_pRevolveParam; readonly int[] m_nFrequencyPoint = new int[7]; const int MIN_DCT_DEGREE = 2; const int MAX_DCT_DEGREE = 12; static MioDecoder () { eriInitializeMatrix(); } public MioDecoder (MioInfoHeader info) { m_nBufLength = 0; m_mioih = info; if (!Initialize()) throw new InvalidFormatException(); } bool Initialize () { if ((m_mioih.ChannelCount != 1) && (m_mioih.ChannelCount != 2)) { return false; } if (m_mioih.Transformation == CvType.Lossless_ERI) { if (m_mioih.Architecture != EriCode.RunlengthHuffman) { return false; } if ((m_mioih.BitsPerSample != 8) && (m_mioih.BitsPerSample != 16)) { return false; } } else if ((m_mioih.Transformation == CvType.LOT_ERI) || (m_mioih.Transformation == CvType.LOT_ERI_MSS)) { if ((m_mioih.Architecture != EriCode.RunlengthGamma) && (m_mioih.Architecture != EriCode.RunlengthHuffman) && (m_mioih.Architecture != EriCode.Nemesis)) { return false; } if (m_mioih.BitsPerSample != 16) { return false; } if ((m_mioih.SubbandDegree < 8) || (m_mioih.SubbandDegree > MAX_DCT_DEGREE)) { return false; } if (m_mioih.LappedDegree != 1) { return false; } int subband = (sizeof(float) << m_mioih.SubbandDegree) / sizeof(float); int block_size = m_mioih.ChannelCount * subband; m_ptrBuffer1 = new int[block_size]; m_ptrMatrixBuf = new float[block_size]; m_ptrInternalBuf = new float[block_size]; m_ptrWorkBuf = new float[subband]; m_ptrWeightTable = new float[subband]; uint nBlocksetSamples = (uint)(m_mioih.ChannelCount << m_mioih.SubbandDegree); uint nLappedSamples = nBlocksetSamples * m_mioih.LappedDegree; if (nLappedSamples > 0) { m_ptrLastDCT = new float[nLappedSamples]; } InitializeWithDegree (m_mioih.SubbandDegree); } else { return false; } return true; } public bool DecodeSound (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos) { context.FlushBuffer(); if (m_mioih.Transformation == CvType.Lossless_ERI) { if (m_mioih.BitsPerSample == 8) { return DecodeSoundPCM8 (context, datahdr, ptrWaveBuf, wave_pos); } else if (m_mioih.BitsPerSample == 16) { return DecodeSoundPCM16 (context, datahdr, ptrWaveBuf, wave_pos); } } else if ((m_mioih.Transformation == CvType.LOT_ERI) || (m_mioih.Transformation == CvType.LOT_ERI_MSS)) { if ((m_mioih.ChannelCount != 2) || (m_mioih.Transformation == CvType.LOT_ERI)) { return DecodeSoundDCT (context, datahdr, ptrWaveBuf, wave_pos); } else { return DecodeSoundDCT_MSS (context, datahdr, ptrWaveBuf, wave_pos); } } return false; } bool DecodeSoundPCM8 (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos) { uint nSampleCount = datahdr.SampleCount; if (nSampleCount > m_nBufLength) { m_ptrBuffer3 = new sbyte [nSampleCount * m_mioih.ChannelCount]; m_nBufLength = nSampleCount; } if (0 != (datahdr.Flags & MIO_LEAD_BLOCK)) { (context as HuffmanDecodeContext).PrepareToDecodeERINACode(); } uint nBytes = nSampleCount * (uint)m_mioih.ChannelCount; if (context.DecodeBytes (m_ptrBuffer3, nBytes) < nBytes) { return false; } int ptrSrcBuf = 0; // (PBYTE) m_ptrBuffer3; int nStep = m_mioih.ChannelCount; for (int i = 0; i < m_mioih.ChannelCount; i ++ ) { int ptrDstBuf = wave_pos + i; sbyte bytValue = 0; for (uint j = 0; j < nSampleCount; j++) { bytValue += m_ptrBuffer3[ptrSrcBuf++]; ptrWaveBuf[ptrDstBuf] = (byte)bytValue; ptrDstBuf += nStep; } } return true; } bool DecodeSoundPCM16 (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos) { uint nSampleCount = datahdr.SampleCount; uint nChannelCount = (uint)m_mioih.ChannelCount; uint nAllSampleCount = nSampleCount * nChannelCount; uint nBytes = nAllSampleCount * sizeof(short); if (ptrWaveBuf.Length < wave_pos + (int)nBytes) return false; if (nSampleCount > m_nBufLength) { m_ptrBuffer3 = new sbyte[nBytes]; m_ptrBuffer4 = new byte[nBytes]; m_nBufLength = nSampleCount; } if (0 != (datahdr.Flags & MIO_LEAD_BLOCK)) { (context as HuffmanDecodeContext).PrepareToDecodeERINACode(); } if (context.DecodeBytes (m_ptrBuffer3, nBytes) < nBytes) { return false; } int pbytSrcBuf1, pbytSrcBuf2, pbytDstBuf; for (int i = 0; i < m_mioih.ChannelCount; i++) { int nOffset = i * (int)nSampleCount * sizeof(short); pbytSrcBuf1 = nOffset; // ((PBYTE) m_ptrBuffer3) + nOffset; pbytSrcBuf2 = pbytSrcBuf1 + (int)nSampleCount; // pbytSrcBuf1 + nSampleCount; pbytDstBuf = nOffset; // ((PBYTE) m_ptrBuffer4) + nOffset; for (uint j = 0; j < nSampleCount; j ++) { sbyte bytLow = m_ptrBuffer3[pbytSrcBuf2 + j]; sbyte bytHigh = m_ptrBuffer3[pbytSrcBuf1 + j]; m_ptrBuffer4[pbytDstBuf + j * sizeof(short) + 0] = (byte)bytLow; m_ptrBuffer4[pbytDstBuf + j * sizeof(short) + 1] = (byte)(bytHigh ^ (bytLow >> 7)); } } if (m_ptrBuffer4.Length < nBytes) return false; unsafe { fixed (byte* rawBuffer4 = m_ptrBuffer4, rawWaveBuf = &ptrWaveBuf[wave_pos]) { int nStep = m_mioih.ChannelCount; short* ptrSrcBuf = (short*)rawBuffer4; for (int i = 0; i < m_mioih.ChannelCount; i++) { short* ptrDstBuf = (short*)rawWaveBuf + i; // (SWORD*) ptrWaveBuf; short wValue = 0; short wDelta = 0; for (uint j = 0; j < nSampleCount; j++) { wDelta += *ptrSrcBuf++; wValue += wDelta; *ptrDstBuf = wValue; ptrDstBuf += nStep; } } } } return true; } static readonly int[] FreqWidth = new int[7] { -6, -6, -5, -4, -3, -2, -1 }; void InitializeWithDegree (int nSubbandDegree) { m_pRevolveParam = eriCreateRevolveParameter (nSubbandDegree); for (int i = 0, j = 0; i < 7; i ++) { int nFrequencyWidth = 1 << (nSubbandDegree + FreqWidth[i]); m_nFrequencyPoint[i] = j + (nFrequencyWidth / 2); j += nFrequencyWidth; } m_nSubbandDegree = nSubbandDegree; m_nDegreeNum = 1 << nSubbandDegree; } const uint MIO_LEAD_BLOCK = 0x01; bool DecodeSoundDCT (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos) { uint i, j, k; uint nDegreeWidth = 1u << m_mioih.SubbandDegree; uint nSampleCount = (datahdr.SampleCount + nDegreeWidth - 1) & ~(nDegreeWidth - 1); uint nSubbandCount = (nSampleCount >> m_mioih.SubbandDegree); uint nChannelCount = (uint)m_mioih.ChannelCount; uint nAllSampleCount = nSampleCount * nChannelCount; uint nAllSubbandCount = nSubbandCount * nChannelCount; if (nSampleCount > m_nBufLength) { m_ptrBuffer2 = new int[nAllSampleCount]; m_ptrBuffer3 = new sbyte[nAllSampleCount * sizeof(short)]; m_ptrDivisionTable = new byte[nAllSubbandCount]; m_ptrWeightCode = new int[nAllSubbandCount * 5]; m_ptrCoefficient = new int[nAllSubbandCount * 5]; m_nBufLength = nSampleCount; } if (context.GetABit() != 0) { return false; } int[] pLastDivision = new int [nChannelCount]; m_ptrNextDivision = 0; // within m_ptrDivisionTable; m_ptrNextWeight = 0; // within m_ptrWeightCode; m_ptrNextCoefficient = 0; // within m_ptrCoefficient; for (i = 0; i < nChannelCount; i++) { pLastDivision[i] = -1; } for (i = 0; i < nSubbandCount; i++) { for (j = 0; j < nChannelCount; j++) { int nDivisionCode = (int)context.GetNBits(2); m_ptrDivisionTable[m_ptrNextDivision++] = (byte)nDivisionCode; if (nDivisionCode != pLastDivision[j]) { if (i != 0) { m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32); m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16); } pLastDivision[j] = nDivisionCode; } uint nDivisionCount = 1u << nDivisionCode; for (k = 0; k < nDivisionCount; k ++) { m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32); m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16); } } } if (nSubbandCount > 0) { for (i = 0; i < nChannelCount; i++) { m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32); m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16); } } if (context.GetABit() != 0) { return false; } if (0 != (datahdr.Flags & MIO_LEAD_BLOCK)) { if (m_mioih.Architecture != EriCode.Nemesis) { (context as HuffmanDecodeContext).PrepareToDecodeERINACode(); } else { throw new NotImplementedException ("Nemesis encoding not implemented"); // context.PrepareToDecodeERISACode(); } } else if (m_mioih.Architecture == EriCode.Nemesis) { throw new NotImplementedException ("Nemesis encoding not implemented"); // context.InitializeERISACode(); } if (m_mioih.Architecture != EriCode.Nemesis) { if (context.DecodeBytes (m_ptrBuffer3, nAllSampleCount * 2 ) < nAllSampleCount * 2) { return false; } int ptrHBuf = 0; // within m_ptrBuffer3; int ptrLBuf = (int)nAllSampleCount; // within m_ptrBuffer3 for (i = 0; i < nDegreeWidth; i++) { int ptrQuantumized = (int)i; // within (PINT) m_ptrBuffer2 for (j = 0; j < nAllSubbandCount; j++) { int nLow = m_ptrBuffer3[ptrLBuf++]; int nHigh = m_ptrBuffer3[ptrHBuf++] ^ (nLow >> 8); m_ptrBuffer2[ptrQuantumized] = (nLow & 0xFF) | (nHigh << 8); ptrQuantumized += (int)nDegreeWidth; } } } else { throw new NotImplementedException ("Nemesis encoding not implemented"); /* if (context.DecodeERISACodeWords (m_ptrBuffer3, nAllSampleCount) < nAllSampleCount) { return false; } for (i = 0; i < nAllSampleCount; i++) { ((PINT)m_ptrBuffer2)[i] = ((SWORD*)m_ptrBuffer3)[i]; } */ } uint nSamples; uint[] pRestSamples = new uint [nChannelCount]; int[] ptrDstBuf = new int [nChannelCount]; // indices within ptrWaveBuf m_ptrNextDivision = 0; // within m_ptrDivisionTable; m_ptrNextWeight = 0; // within m_ptrWeightCode; m_ptrNextCoefficient = 0; // within m_ptrCoefficient; m_ptrNextSource = 0; // within (PINT) m_ptrBuffer2; for (i = 0; i < nChannelCount; i++) { pLastDivision[i] = -1; pRestSamples[i] = datahdr.SampleCount; ptrDstBuf[i] = wave_pos + (int)i*sizeof(short); } int nCurrentDivision = -1; for (i = 0; i < nSubbandCount; i++) { for (j = 0; j < nChannelCount; j++) { int nDivisionCode = m_ptrDivisionTable[m_ptrNextDivision++]; int nDivisionCount = 1 << nDivisionCode; int nChannelStep = (int)(nDegreeWidth * m_mioih.LappedDegree * j); m_ptrLastDCTBuf = nChannelStep; // within m_ptrLastDCT bool fLeadBlock = false; if (pLastDivision[j] != nDivisionCode) { if (i != 0) { if (nCurrentDivision != pLastDivision[j]) { InitializeWithDegree (m_mioih.SubbandDegree - pLastDivision[j]); nCurrentDivision = pLastDivision[j]; } nSamples = pRestSamples[j]; if (nSamples > m_nDegreeNum) { nSamples = (uint)m_nDegreeNum; } DecodePostBlock (ptrWaveBuf, ptrDstBuf[j], nSamples); pRestSamples[j] -= nSamples; ptrDstBuf[j] += (int)(nSamples * nChannelCount * sizeof(short)); } pLastDivision[j] = (int)nDivisionCode; fLeadBlock = true; } if (nCurrentDivision != nDivisionCode) { InitializeWithDegree (m_mioih.SubbandDegree - nDivisionCode); nCurrentDivision = nDivisionCode; } for (k = 0; k < nDivisionCount; k++) { if (fLeadBlock) { DecodeLeadBlock(); fLeadBlock = false; } else { nSamples = pRestSamples[j]; if (nSamples > m_nDegreeNum) { nSamples = (uint)m_nDegreeNum; } DecodeInternalBlock (ptrWaveBuf, ptrDstBuf[j], nSamples); pRestSamples[j] -= nSamples; ptrDstBuf[j] += (int)(nSamples * nChannelCount * sizeof(short)); } } } } if (nSubbandCount > 0) { for (i = 0; i < nChannelCount; i ++) { int nChannelStep = (int)(nDegreeWidth * m_mioih.LappedDegree * i); m_ptrLastDCTBuf = nChannelStep; // within m_ptrLastDCT if (nCurrentDivision != pLastDivision[i]) { InitializeWithDegree (m_mioih.SubbandDegree - pLastDivision[i]); nCurrentDivision = pLastDivision[i]; } nSamples = pRestSamples[i]; if (nSamples > m_nDegreeNum) { nSamples = (uint)m_nDegreeNum; } DecodePostBlock (ptrWaveBuf, ptrDstBuf[i], nSamples); pRestSamples[i] -= nSamples; ptrDstBuf[i] += (int)(nSamples * nChannelCount * sizeof(short)); } } return true; } void DecodeInternalBlock (byte[] ptrDst, int iDst, uint nSamples) { int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++]; int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++]; IQuantumize (m_ptrMatrixBuf, 0, m_ptrBuffer2, m_ptrNextSource, m_nDegreeNum, nWeightCode, nCoefficient); m_ptrNextSource += (int)m_nDegreeNum; eriOddGivensInverseMatrix (m_ptrMatrixBuf, 0, m_pRevolveParam, m_nSubbandDegree); eriFastIPLOT (m_ptrMatrixBuf, 0, m_nSubbandDegree); eriFastILOT (m_ptrWorkBuf, m_ptrLastDCT, m_ptrLastDCTBuf, m_ptrMatrixBuf, 0, m_nSubbandDegree); Array.Copy (m_ptrMatrixBuf, 0, m_ptrLastDCT, m_ptrLastDCTBuf, m_nDegreeNum); Array.Copy (m_ptrWorkBuf, 0, m_ptrMatrixBuf, 0, m_nDegreeNum); eriFastIDCT (m_ptrInternalBuf, m_ptrMatrixBuf, 0, 1, m_ptrWorkBuf, m_nSubbandDegree); if (nSamples != 0) { eriRoundR32ToWordArray (ptrDst, iDst, m_mioih.ChannelCount, m_ptrInternalBuf, (int)nSamples); } } void DecodeLeadBlock () { int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++]; int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++]; uint i; uint nHalfDegree = (uint)m_nDegreeNum / 2; for (i = 0; i < nHalfDegree; i++) { m_ptrBuffer1[i * 2] = 0; m_ptrBuffer1[i * 2 + 1] = m_ptrBuffer2[m_ptrNextSource++]; } IQuantumize (m_ptrLastDCT, m_ptrLastDCTBuf, m_ptrBuffer1, 0, m_nDegreeNum, nWeightCode, nCoefficient); eriOddGivensInverseMatrix (m_ptrLastDCT, m_ptrLastDCTBuf, m_pRevolveParam, m_nSubbandDegree); for (i = 0; i < m_nDegreeNum; i += 2) { m_ptrLastDCT[m_ptrLastDCTBuf + i] = m_ptrLastDCT[m_ptrLastDCTBuf + i + 1]; } eriFastIPLOT (m_ptrLastDCT, m_ptrLastDCTBuf, m_nSubbandDegree); } void DecodePostBlock (byte[] ptrDst, int iDst, uint nSamples) { int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++]; int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++]; uint i; uint nHalfDegree = (uint)m_nDegreeNum / 2; for (i = 0; i < nHalfDegree; i++) { m_ptrBuffer1[i * 2] = 0; m_ptrBuffer1[i * 2 + 1] = m_ptrBuffer2[m_ptrNextSource++]; } IQuantumize (m_ptrMatrixBuf, 0, m_ptrBuffer1, 0, m_nDegreeNum, nWeightCode, nCoefficient); eriOddGivensInverseMatrix (m_ptrMatrixBuf, 0, m_pRevolveParam, m_nSubbandDegree); for (i = 0; i < m_nDegreeNum; i += 2) { m_ptrMatrixBuf[i] = - m_ptrMatrixBuf[i + 1]; } eriFastIPLOT (m_ptrMatrixBuf, 0, m_nSubbandDegree); eriFastILOT (m_ptrWorkBuf, m_ptrLastDCT, m_ptrLastDCTBuf, m_ptrMatrixBuf, 0, m_nSubbandDegree); Array.Copy (m_ptrWorkBuf, 0, m_ptrMatrixBuf, 0, m_nDegreeNum); eriFastIDCT (m_ptrInternalBuf, m_ptrMatrixBuf, 0, 1, m_ptrWorkBuf, m_nSubbandDegree); if (nSamples != 0) { eriRoundR32ToWordArray (ptrDst, iDst, m_mioih.ChannelCount, m_ptrInternalBuf, (int)nSamples); } } bool DecodeSoundDCT_MSS (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos) { uint nDegreeWidth = 1u << m_mioih.SubbandDegree; uint nSampleCount = (datahdr.SampleCount + nDegreeWidth - 1) & ~(nDegreeWidth - 1); uint nSubbandCount = (nSampleCount >> m_mioih.SubbandDegree); uint nChannelCount = (uint)m_mioih.ChannelCount; uint nAllSampleCount = nSampleCount * nChannelCount; uint nAllSubbandCount = nSubbandCount; if (nSampleCount > m_nBufLength) { m_ptrBuffer2 = new int[nAllSampleCount]; m_ptrBuffer3 = new sbyte[nAllSampleCount * sizeof(short)]; m_ptrDivisionTable = new byte[nAllSubbandCount]; m_ptrRevolveCode = new byte[nAllSubbandCount * 10]; m_ptrWeightCode = new int[nAllSubbandCount * 10]; m_ptrCoefficient = new int[nAllSubbandCount * 10]; m_nBufLength = nSampleCount; } if (context.GetABit() != 0) { return false; } int nLastDivision = -1; m_ptrNextDivision = 0; // within m_ptrDivisionTable; m_ptrNextRevCode = 0; // within m_ptrRevolveCode; m_ptrNextWeight = 0; // within m_ptrWeightCode; m_ptrNextCoefficient = 0; // within m_ptrCoefficient; uint i, j, k; for (i = 0; i < nSubbandCount; i ++) { int nDivisionCode = (int)context.GetNBits (2); m_ptrDivisionTable[m_ptrNextDivision++] = (byte)nDivisionCode; bool fLeadBlock = false; if (nDivisionCode != nLastDivision) { if (i != 0) { m_ptrRevolveCode[m_ptrNextRevCode++] = (byte)context.GetNBits (2); m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32); m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16); } fLeadBlock = true; nLastDivision = nDivisionCode; } uint nDivisionCount = 1u << nDivisionCode; for (k = 0; k < nDivisionCount; k++) { if (fLeadBlock) { m_ptrRevolveCode[m_ptrNextRevCode++] = (byte)context.GetNBits (2); fLeadBlock = false; } else { m_ptrRevolveCode[m_ptrNextRevCode++] = (byte)context.GetNBits (4); } m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32); m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16); } } if (nSubbandCount > 0) { m_ptrRevolveCode[m_ptrNextRevCode++] = (byte)context.GetNBits (2); m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32); m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16); } if (context.GetABit() != 0) { return false; } if (0 != (datahdr.Flags & MIO_LEAD_BLOCK)) { if (m_mioih.Architecture != EriCode.Nemesis) { (context as HuffmanDecodeContext).PrepareToDecodeERINACode(); } else { throw new NotImplementedException ("Nemesis encoding not implemented"); // context.PrepareToDecodeERISACode( ); } } else if (m_mioih.Architecture == EriCode.Nemesis) { throw new NotImplementedException ("Nemesis encoding not implemented"); // context.InitializeERISACode( ); } if (m_mioih.Architecture != EriCode.Nemesis) { if (context.DecodeBytes (m_ptrBuffer3, nAllSampleCount * 2) < nAllSampleCount * 2) { return false; } int ptrHBuf = 0; // within m_ptrBuffer3; int ptrLBuf = (int)nAllSampleCount; // within m_ptrBuffer3 for (i = 0; i < nDegreeWidth * 2; i++) { int ptrQuantumized = (int)i; // within (PINT) m_ptrBuffer2 for (j = 0; j < nAllSubbandCount; j++) { int nLow = m_ptrBuffer3[ptrLBuf++]; int nHigh = m_ptrBuffer3[ptrHBuf++] ^ (nLow >> 8); m_ptrBuffer2[ptrQuantumized] = (nLow & 0xFF) | (nHigh << 8); ptrQuantumized += (int)nDegreeWidth * 2; } } } else { throw new NotImplementedException ("Nemesis encoding not implemented"); /* if ( context.DecodeERISACodeWords ( (SWORD*) m_ptrBuffer3, nAllSampleCount ) < nAllSampleCount ) { return false; } for ( i = 0; i < nAllSampleCount; i ++ ) { ((PINT)m_ptrBuffer2)[i] = ((SWORD*)m_ptrBuffer3)[i]; } */ } uint nSamples; uint nRestSamples = datahdr.SampleCount; // int ptrDstBuf = wave_pos; // within (SWORD*) ptrWaveBuf; nLastDivision = -1; m_ptrNextDivision = 0; // m_ptrDivisionTable; m_ptrNextRevCode = 0; // m_ptrRevolveCode; m_ptrNextWeight = 0; // m_ptrWeightCode; m_ptrNextCoefficient = 0; // m_ptrCoefficient; m_ptrNextSource = 0; // (PINT) m_ptrBuffer2; for (i = 0; i < nSubbandCount; i++) { int nDivisionCode = m_ptrDivisionTable[m_ptrNextDivision++]; uint nDivisionCount = 1u << nDivisionCode; bool fLeadBlock = false; if (nLastDivision != nDivisionCode) { if (i != 0) { nSamples = Math.Min (nRestSamples, (uint)m_nDegreeNum); DecodePostBlock_MSS (ptrWaveBuf, wave_pos, nSamples); nRestSamples -= nSamples; wave_pos += (int)(nSamples * nChannelCount * sizeof(short)); } InitializeWithDegree (m_mioih.SubbandDegree - nDivisionCode); nLastDivision = nDivisionCode; fLeadBlock = true; } for (k = 0; k < nDivisionCount; k++) { if (fLeadBlock) { DecodeLeadBlock_MSS(); fLeadBlock = false; } else { nSamples = nRestSamples; if (nSamples > m_nDegreeNum) { nSamples = (uint)m_nDegreeNum; } DecodeInternalBlock_MSS (ptrWaveBuf, wave_pos, nSamples); nRestSamples -= nSamples; wave_pos += (int)(nSamples * nChannelCount * sizeof(short)); } } } if (nSubbandCount > 0) { nSamples = nRestSamples; if (nSamples > m_nDegreeNum) { nSamples = (uint)m_nDegreeNum; } DecodePostBlock_MSS (ptrWaveBuf, wave_pos, nSamples); nRestSamples -= nSamples; wave_pos += (int)(nSamples * nChannelCount) * sizeof(short); } return true; } void DecodeLeadBlock_MSS () { uint i, j; uint nHalfDegree = (uint)m_nDegreeNum / 2; int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++]; int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++]; int ptrLapBuf = 0; // within m_ptrLastDCT; for (i = 0; i < 2; i++) { int ptrSrcBuf = 0; // within (PINT) m_ptrBuffer1; for (j = 0; j < nHalfDegree; j++) { m_ptrBuffer1[ptrSrcBuf + j * 2] = 0; m_ptrBuffer1[ptrSrcBuf + j * 2 + 1] = m_ptrBuffer2[m_ptrNextSource++]; } IQuantumize (m_ptrLastDCT, ptrLapBuf, m_ptrBuffer1, ptrSrcBuf, m_nDegreeNum, nWeightCode, nCoefficient); ptrLapBuf += (int)m_nDegreeNum; } int nRevCode = m_ptrRevolveCode[m_ptrNextRevCode++]; int ptrLapBuf1 = 0; // m_ptrLastDCT; int ptrLapBuf2 = (int)m_nDegreeNum; // m_ptrLastDCT float rSin = (float)Math.Sin (nRevCode * Math.PI / 8); float rCos = (float)Math.Cos (nRevCode * Math.PI / 8); eriRevolve2x2 (m_ptrLastDCT, ptrLapBuf1, m_ptrLastDCT, ptrLapBuf2, rSin, rCos, 1, m_nDegreeNum); ptrLapBuf = 0; //m_ptrLastDCT; for (i = 0; i < 2; i++) { eriOddGivensInverseMatrix (m_ptrLastDCT, ptrLapBuf, m_pRevolveParam, m_nSubbandDegree); for (j = 0; j < m_nDegreeNum; j += 2) { m_ptrLastDCT[ptrLapBuf + j] = m_ptrLastDCT[ptrLapBuf + j + 1]; } eriFastIPLOT (m_ptrLastDCT, ptrLapBuf, m_nSubbandDegree); ptrLapBuf += (int)m_nDegreeNum; } } void DecodeInternalBlock_MSS (byte[] ptrDst, int iDst, uint nSamples) { int ptrSrcBuf = 0; // m_ptrMatrixBuf; int ptrLapBuf = 0; // m_ptrLastDCT; int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++]; int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++]; for (int i = 0; i < 2; i++) { IQuantumize (m_ptrMatrixBuf, ptrSrcBuf, m_ptrBuffer2, m_ptrNextSource, m_nDegreeNum, nWeightCode, nCoefficient); m_ptrNextSource += m_nDegreeNum; ptrSrcBuf += m_nDegreeNum; } int nRevCode = m_ptrRevolveCode[m_ptrNextRevCode++]; int nRevCode1 = (nRevCode >> 2) & 0x03; int nRevCode2 = (nRevCode & 0x03); int ptrSrcBuf1 = 0; // m_ptrMatrixBuf; int ptrSrcBuf2 = m_nDegreeNum; // m_ptrMatrixBuf + m_nDegreeNum; float rSin = (float) Math.Sin (nRevCode1 * Math.PI / 8); float rCos = (float) Math.Cos (nRevCode1 * Math.PI / 8); eriRevolve2x2 (m_ptrMatrixBuf, ptrSrcBuf1, m_ptrMatrixBuf, ptrSrcBuf2, rSin, rCos, 2, m_nDegreeNum / 2); rSin = (float) Math.Sin (nRevCode2 * Math.PI / 8); rCos = (float) Math.Cos (nRevCode2 * Math.PI / 8); eriRevolve2x2 (m_ptrMatrixBuf, ptrSrcBuf1 + 1, m_ptrMatrixBuf, ptrSrcBuf2 + 1, rSin, rCos, 2, m_nDegreeNum / 2); ptrSrcBuf = 0; // m_ptrMatrixBuf; for (int i = 0; i < 2; i++) { eriOddGivensInverseMatrix (m_ptrMatrixBuf, ptrSrcBuf, m_pRevolveParam, m_nSubbandDegree); eriFastIPLOT (m_ptrMatrixBuf, ptrSrcBuf, m_nSubbandDegree); eriFastILOT (m_ptrWorkBuf, m_ptrLastDCT, ptrLapBuf, m_ptrMatrixBuf, ptrSrcBuf, m_nSubbandDegree); Array.Copy (m_ptrMatrixBuf, ptrSrcBuf, m_ptrLastDCT, ptrLapBuf, m_nDegreeNum); Array.Copy (m_ptrWorkBuf, 0, m_ptrMatrixBuf, ptrSrcBuf, m_nDegreeNum); eriFastIDCT (m_ptrInternalBuf, m_ptrMatrixBuf, ptrSrcBuf, 1, m_ptrWorkBuf, m_nSubbandDegree); if (nSamples != 0) { eriRoundR32ToWordArray (ptrDst, iDst + (int)i*2, 2, m_ptrInternalBuf, (int)nSamples); } ptrSrcBuf += m_nDegreeNum; ptrLapBuf += m_nDegreeNum; } } void DecodePostBlock_MSS (byte[] ptrDst, int iDst, uint nSamples) { int ptrLapBuf = 0; // m_ptrLastDCT; int ptrSrcBuf = 0; // m_ptrMatrixBuf; int i, j; uint nHalfDegree = (uint)m_nDegreeNum / 2u; int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++]; int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++]; for (i = 0; i < 2; i++) { for (j = 0; j < nHalfDegree; j++) { m_ptrBuffer1[j * 2] = 0; m_ptrBuffer1[j * 2 + 1] = m_ptrBuffer2[m_ptrNextSource++]; } IQuantumize (m_ptrMatrixBuf, ptrSrcBuf, m_ptrBuffer1, 0, m_nDegreeNum, nWeightCode, nCoefficient); ptrSrcBuf += m_nDegreeNum; } float rSin, rCos; int nRevCode = m_ptrRevolveCode[m_ptrNextRevCode++]; int ptrSrcBuf1 = 0; // m_ptrMatrixBuf; int ptrSrcBuf2 = m_nDegreeNum; // m_ptrMatrixBuf + m_nDegreeNum; rSin = (float) Math.Sin (nRevCode * Math.PI / 8); rCos = (float) Math.Cos (nRevCode * Math.PI / 8); eriRevolve2x2 (m_ptrMatrixBuf, ptrSrcBuf1, m_ptrMatrixBuf, ptrSrcBuf2, rSin, rCos, 1, m_nDegreeNum); ptrSrcBuf = 0; // m_ptrMatrixBuf; for (i = 0; i < 2; i ++) { eriOddGivensInverseMatrix (m_ptrMatrixBuf, ptrSrcBuf, m_pRevolveParam, m_nSubbandDegree); for (j = 0; j < m_nDegreeNum; j += 2) { m_ptrMatrixBuf[ptrSrcBuf + j] = -m_ptrMatrixBuf[ptrSrcBuf + j + 1]; } eriFastIPLOT (m_ptrMatrixBuf, ptrSrcBuf, m_nSubbandDegree); eriFastILOT (m_ptrWorkBuf, m_ptrLastDCT, ptrLapBuf, m_ptrMatrixBuf, ptrSrcBuf, m_nSubbandDegree); Array.Copy (m_ptrWorkBuf, 0, m_ptrMatrixBuf, ptrSrcBuf, m_nDegreeNum); eriFastIDCT (m_ptrInternalBuf, m_ptrMatrixBuf, ptrSrcBuf, 1, m_ptrWorkBuf, m_nSubbandDegree); if (nSamples != 0) { eriRoundR32ToWordArray (ptrDst, iDst + (int)i*2, 2, m_ptrInternalBuf, (int)nSamples); } ptrLapBuf += m_nDegreeNum; ptrSrcBuf += m_nDegreeNum; } } void IQuantumize (float[] ptrDestination, int dst, int[] ptrQuantumized, int qsrc, int nDegreeNum, int nWeightCode, int nCoefficient) { int i, j; double rMatrixScale = Math.Sqrt (2.0 / nDegreeNum); double rCoefficient = rMatrixScale * nCoefficient; double[] rAvgRatio = new double[7]; for (i = 0; i < 6; i++) { rAvgRatio[i] = 1.0 / Math.Pow (2.0, (((nWeightCode >> (i * 5)) & 0x1F) - 15) * 0.5); } rAvgRatio[6] = 1.0; for (i = 0; i < m_nFrequencyPoint[0]; i++) { m_ptrWeightTable[i] = (float) rAvgRatio[0]; } for (j = 1; j < 7; j++) { double a = rAvgRatio[j - 1]; double k = (rAvgRatio[j] - a) / (m_nFrequencyPoint[j] - m_nFrequencyPoint[j - 1]); while (i < m_nFrequencyPoint[j]) { m_ptrWeightTable[i] = (float)(k * (i - m_nFrequencyPoint[j - 1]) + a); i++; } } while (i < nDegreeNum) { m_ptrWeightTable[i++] = (float)rAvgRatio[6]; } float rOddWeight = (float)((((nWeightCode >> 30) & 0x03) + 0x02) / 2.0); for (i = 15; i < nDegreeNum; i += 16) { m_ptrWeightTable[i] *= rOddWeight; } m_ptrWeightTable[nDegreeNum-1] = (float) nCoefficient; for (i = 0; i < nDegreeNum; i++) { m_ptrWeightTable[i] = 1.0F / m_ptrWeightTable[i]; } for (i = 0; i < nDegreeNum; i ++) { ptrDestination[dst + i] = (float) (rCoefficient * m_ptrWeightTable[i] * ptrQuantumized[qsrc+i]); } } static readonly float ERI_rCosPI4 = (float)Math.Cos (Math.PI / 4); static readonly float ERI_r2CosPI4 = 2 * ERI_rCosPI4; static readonly float[] ERI_DCTofK2 = new float[2]; // = cos( (2*i+1) / 8 ) static readonly float[] ERI_DCTofK4 = new float[4]; // = cos( (2*i+1) / 16 ) static readonly float[] ERI_DCTofK8 = new float[8]; // = cos( (2*i+1) / 32 ) static readonly float[] ERI_DCTofK16 = new float[16]; // = cos( (2*i+1) / 64 ) static readonly float[] ERI_DCTofK32 = new float[32]; // = cos( (2*i+1) / 128 ) static readonly float[] ERI_DCTofK64 = new float[64]; // = cos( (2*i+1) / 256 ) static readonly float[] ERI_DCTofK128 = new float[128]; // = cos( (2*i+1) / 512 ) static readonly float[] ERI_DCTofK256 = new float[256]; // = cos( (2*i+1) / 1024 ) static readonly float[] ERI_DCTofK512 = new float[512]; // = cos( (2*i+1) / 2048 ) static readonly float[] ERI_DCTofK1024 = new float[1024]; // = cos( (2*i+1) / 4096 ) static readonly float[] ERI_DCTofK2048 = new float[2048]; // = cos( (2*i+1) / 8192 ) static readonly float[][] ERI_pMatrixDCTofK = new float[MAX_DCT_DEGREE][] { null, ERI_DCTofK2, ERI_DCTofK4, ERI_DCTofK8, ERI_DCTofK16, ERI_DCTofK32, ERI_DCTofK64, ERI_DCTofK128, ERI_DCTofK256, ERI_DCTofK512, ERI_DCTofK1024, ERI_DCTofK2048 }; static void eriInitializeMatrix () { for (int i = 1; i < MAX_DCT_DEGREE; i++) { int n = (1 << i); float[] pDCTofK = ERI_pMatrixDCTofK[i]; double nr = Math.PI / (4.0 * n); double dr = nr + nr; double ir = nr; for (int j = 0; j < n; j++) { pDCTofK[j] = (float)Math.Cos (ir); ir += dr; } } } static void eriRoundR32ToWordArray (byte[] ptrDst, int dst, int nStep, float[] ptrSrc, int nCount) { nStep *= 2; for (int i = 0; i < nCount; i++) { int nValue = eriRoundR32ToInt (ptrSrc[i]); if (nValue <= -0x8000) { LittleEndian.Pack ((short)-0x8000, ptrDst, dst); } else if (nValue >= 0x7FFF) { LittleEndian.Pack ((short)0x7FFF, ptrDst, dst); } else { LittleEndian.Pack ((short)nValue, ptrDst, dst); } dst += nStep; } } static int eriRoundR32ToInt (float r) { if (r >= 0.0) return (int)Math.Floor (r + 0.5); else return (int)Math.Ceiling (r - 0.5); } static EriSinCos[] eriCreateRevolveParameter (int nDegreeDCT) { int nDegreeNum = 1 << nDegreeDCT; int lc = 1; for (int n = nDegreeNum / 2; n >= 8; n /= 8) { ++lc; } EriSinCos[] ptrRevolve = new EriSinCos[lc*8]; double k = Math.PI / (nDegreeNum * 2); int ptrNextRev = 0; int nStep = 2; do { for (int i = 0; i < 7; i++) { double ws = 1.0; double a = 0.0; for (int j = 0; j < i; j++) { a += nStep; ws = ws * ptrRevolve[ptrNextRev+j].rSin + ptrRevolve[ptrNextRev+j].rCos * Math.Cos (a * k); } double r = Math.Atan2 (ws, Math.Cos ((a + nStep) * k)); ptrRevolve[ptrNextRev+i].rSin = (float)Math.Sin (r); ptrRevolve[ptrNextRev+i].rCos = (float)Math.Cos (r); } ptrNextRev += 7; nStep *= 8; } while (nStep < nDegreeNum); return ptrRevolve; } static void eriOddGivensInverseMatrix (float[] ptrSrc, int src, EriSinCos[] ptrRevolve, int nDegreeDCT) { int nDegreeNum = 1 << nDegreeDCT; int index = 1; int nStep = 2; int lc = (nDegreeNum / 2) / 8; int resolve_idx = 0; for (;;) { resolve_idx += 7; index += nStep * 7; nStep *= 8; if (lc <= 8) break; lc /= 8; } int k = index + nStep * (lc - 2); int j; float r1, r2; for (j = lc - 2; j >= 0; j--) { r1 = ptrSrc[src + k]; r2 = ptrSrc[src + k + nStep]; ptrSrc[src + k] = r1 * ptrRevolve[resolve_idx+j].rCos + r2 * ptrRevolve[resolve_idx+j].rSin; ptrSrc[src + k + nStep] = r2 * ptrRevolve[resolve_idx+j].rCos - r1 * ptrRevolve[resolve_idx+j].rSin; k -= nStep; } for (; lc <= (nDegreeNum / 2) / 8; lc *= 8) { resolve_idx -= 7; nStep /= 8; index -= nStep * 7; for (int i = 0; i < lc; i++) { k = i * (nStep * 8) + index + nStep * 6; for ( j = 6; j >= 0; j -- ) { r1 = ptrSrc[src + k]; r2 = ptrSrc[src + k + nStep]; ptrSrc[src + k] = r1 * ptrRevolve[resolve_idx+j].rCos + r2 * ptrRevolve[resolve_idx+j].rSin; ptrSrc[src + k + nStep] = r2 * ptrRevolve[resolve_idx+j].rCos - r1 * ptrRevolve[resolve_idx+j].rSin; k -= nStep; } } } } static void eriFastIPLOT (float[] ptrSrc, int src, int nDegreeDCT) { int nDegreeNum = 1 << nDegreeDCT; for (int i = 0; i < nDegreeNum; i += 2) { float r1 = ptrSrc[src + i]; float r2 = ptrSrc[src + i + 1]; ptrSrc[src + i] = 0.5f * (r1 + r2); ptrSrc[src + i + 1] = 0.5f * (r1 - r2); } } static void eriFastILOT (float[] ptrDst, float[] ptrSrc1, int src1, float[] ptrSrc2, int src2, int nDegreeDCT) { int nDegreeNum = 1 << nDegreeDCT; for (int i = 0; i < nDegreeNum; i += 2) { float r1 = ptrSrc1[src1 + i]; float r2 = ptrSrc2[src2 + i + 1]; ptrDst[i] = r1 + r2; ptrDst[i + 1] = r1 - r2; } } static void eriFastDCT (float[] ptrDst, int dst, int nDstInterval, float[] ptrSrc, int src, float[] ptrWorkBuf, int work, int nDegreeDCT) { Debug.Assert ((nDegreeDCT >= MIN_DCT_DEGREE) && (nDegreeDCT <= MAX_DCT_DEGREE)); if (nDegreeDCT == MIN_DCT_DEGREE) { float[] r32Buf = new float[4]; r32Buf[0] = ptrSrc[src] + ptrSrc[src+3]; r32Buf[2] = ptrSrc[src] - ptrSrc[src+3]; r32Buf[1] = ptrSrc[src+1] + ptrSrc[src+2]; r32Buf[3] = ptrSrc[src+1] - ptrSrc[src+2]; ptrDst[dst] = 0.5f * (r32Buf[0] + r32Buf[1]); ptrDst[dst+nDstInterval * 2] = ERI_rCosPI4 * (r32Buf[0] - r32Buf[1]); r32Buf[2] = ERI_DCTofK2[0] * r32Buf[2]; r32Buf[3] = ERI_DCTofK2[1] * r32Buf[3]; r32Buf[0] = r32Buf[2] + r32Buf[3]; r32Buf[1] = ERI_r2CosPI4 * (r32Buf[2] - r32Buf[3]); r32Buf[1] -= r32Buf[0]; ptrDst[dst+nDstInterval] = r32Buf[0]; ptrDst[dst+nDstInterval * 3] = r32Buf[1]; } else { uint i; uint nDegreeNum = 1u << nDegreeDCT; uint nHalfDegree = nDegreeNum >> 1; for (i = 0; i < nHalfDegree; i++) { ptrWorkBuf[work+i] = ptrSrc[src+i] + ptrSrc[src + nDegreeNum - i - 1]; ptrWorkBuf[work+i + nHalfDegree] = ptrSrc[src+i] - ptrSrc[src + nDegreeNum - i - 1]; } int nDstStep = nDstInterval << 1; eriFastDCT (ptrDst, dst, nDstStep, ptrWorkBuf, work, ptrSrc, src, nDegreeDCT - 1); float[] pDCTofK = ERI_pMatrixDCTofK[nDegreeDCT - 1]; src = (int)(work+nHalfDegree); // ptrSrc = ptrWorkBuf + nHalfDegree; dst += nDstInterval; // ptrDst += nDstInterval; for (i = 0; i < nHalfDegree; i++) { ptrWorkBuf[src + i] *= pDCTofK[i]; } eriFastDCT (ptrDst, dst, nDstStep, ptrWorkBuf, src, ptrWorkBuf, work, nDegreeDCT - 1); // eriFastDCT (ptrDst, nDstStep, ptrSrc, ptrWorkBuf, nDegreeDCT - 1); int ptrNext = dst; // within ptrDst; for (i = 0; i < nHalfDegree; i++) { ptrDst[ptrNext] += ptrDst[ptrNext]; // *ptrNext += *ptrNext; ptrNext += nDstStep; } ptrNext = dst; for (i = 1; i < nHalfDegree; i ++) { ptrDst[ptrNext + nDstStep] -= ptrDst[ptrNext]; ptrNext += nDstStep; } } } static void eriFastIDCT (float[] ptrDst, float[] srcBuf, int ptrSrc, int nSrcInterval, float[] ptrWorkBuf, int nDegreeDCT) { Debug.Assert ((nDegreeDCT >= MIN_DCT_DEGREE) && (nDegreeDCT <= MAX_DCT_DEGREE)); if (nDegreeDCT == MIN_DCT_DEGREE) { float[] r32Buf1 = new float[2]; float[] r32Buf2 = new float[4]; r32Buf1[0] = srcBuf[ptrSrc]; r32Buf1[1] = ERI_rCosPI4 * srcBuf[ptrSrc + nSrcInterval * 2]; r32Buf2[0] = r32Buf1[0] + r32Buf1[1]; r32Buf2[1] = r32Buf1[0] - r32Buf1[1]; r32Buf1[0] = ERI_DCTofK2[0] * srcBuf[ptrSrc + nSrcInterval]; r32Buf1[1] = ERI_DCTofK2[1] * srcBuf[ptrSrc + nSrcInterval * 3]; r32Buf2[2] = r32Buf1[0] + r32Buf1[1]; r32Buf2[3] = ERI_r2CosPI4 * (r32Buf1[0] - r32Buf1[1]); r32Buf2[3] -= r32Buf2[2]; ptrDst[0] = r32Buf2[0] + r32Buf2[2]; ptrDst[3] = r32Buf2[0] - r32Buf2[2]; ptrDst[1] = r32Buf2[1] + r32Buf2[3]; ptrDst[2] = r32Buf2[1] - r32Buf2[3]; } else { uint nDegreeNum = 1u << nDegreeDCT; uint nHalfDegree = nDegreeNum >> 1; int nSrcStep = nSrcInterval << 1; eriFastIDCT (ptrDst, srcBuf, ptrSrc, nSrcStep, ptrWorkBuf, nDegreeDCT - 1); float[] pDCTofK = ERI_pMatrixDCTofK[nDegreeDCT - 1]; int pOddDst = (int)nHalfDegree; // within ptrDst int ptrNext = ptrSrc + nSrcInterval; // within srcBuf uint i; for (i = 0; i < nHalfDegree; i++) { ptrWorkBuf[i] = srcBuf[ptrNext] * pDCTofK[i]; ptrNext += nSrcStep; } eriFastDCT (ptrDst, pOddDst, 1, ptrWorkBuf, 0, ptrWorkBuf, (int)nHalfDegree, nDegreeDCT - 1); // eriFastDCT(pOddDst, 1, ptrWorkBuf, (ptrWorkBuf + nHalfDegree), nDegreeDCT - 1); for (i = 0; i < nHalfDegree; i ++) { ptrDst[pOddDst + i] += ptrDst[pOddDst + i]; } for (i = 1; i < nHalfDegree; i++) { ptrDst[pOddDst + i] -= ptrDst[pOddDst + i - 1]; } float[] r32Buf = new float[4]; uint nQuadDegree = nHalfDegree >> 1; for (i = 0; i < nQuadDegree; i++) { r32Buf[0] = ptrDst[i] + ptrDst[nHalfDegree + i]; r32Buf[3] = ptrDst[i] - ptrDst[nHalfDegree + i]; r32Buf[1] = ptrDst[nHalfDegree - 1 - i] + ptrDst[nDegreeNum - 1 - i]; r32Buf[2] = ptrDst[nHalfDegree - 1 - i] - ptrDst[nDegreeNum - 1 - i]; ptrDst[i] = r32Buf[0]; ptrDst[nHalfDegree - 1 - i] = r32Buf[1]; ptrDst[nHalfDegree + i] = r32Buf[2]; ptrDst[nDegreeNum - 1 - i] = r32Buf[3]; } } } void eriRevolve2x2 (float[] buf1, int ptrBuf1, float[] buf2, int ptrBuf2, float rSin, float rCos, int nStep, int nCount) { for (int i = 0; i < nCount; i++) { float r1 = buf1[ptrBuf1]; float r2 = buf2[ptrBuf2]; buf1[ptrBuf1] = r1 * rCos - r2 * rSin; buf2[ptrBuf2] = r1 * rSin + r2 * rCos; ptrBuf1 += nStep; ptrBuf2 += nStep; } } } }