/******************************** MPEG Audio Encoder ************************** (C) Copyright Fraunhofer IIS (1999) All Rights Reserved Please be advised that this software and/or program delivery is Confidential Information of Fraunhofer and subject to and covered by the Fraunhofer IIS Software Evaluation Agreement between Google Inc. and Fraunhofer effective and in full force since March 1, 2012. You may use this software and/or program only under the terms and conditions described in the above mentioned Fraunhofer IIS Software Evaluation Agreement. Any other and/or further use requires a separate agreement. This software and/or program is protected by copyright law and international treaties. Any reproduction or distribution of this software and/or program, or any portion of it, may result in severe civil and criminal penalties, and will be prosecuted to the maximum extent possible under law. $Id$ Initial author: Alex Groeschel contents/description: Temporal noise shaping ******************************************************************************/ #include "aacenc_tns.h" #include "psy_const.h" #include "psy_configuration.h" #include "tns_func.h" #include "aacEnc_rom.h" #include "aacenc_tns.h" enum { HIFILT = 0, /* index of higher filter */ LOFILT = 1 /* index of lower filter */ }; #define FILTER_DIRECTION 0 static const FIXP_DBL acfWindowLong[12+3+1] = { 0x7fffffff,0x7fb80000,0x7ee00000,0x7d780000,0x7b800000,0x78f80000,0x75e00000,0x72380000, 0x6e000000,0x69380000,0x63e00000,0x5df80000,0x57800000,0x50780000,0x48e00000,0x40b80000 }; static const FIXP_DBL acfWindowShort[4+3+1] = { 0x7fffffff,0x7e000000,0x78000000,0x6e000000,0x60000000,0x4e000000,0x38000000,0x1e000000 }; typedef struct { INT filterEnabled[MAX_NUM_OF_FILTERS]; INT threshOn[MAX_NUM_OF_FILTERS]; /* min. prediction gain for using tns TABUL*/ INT filterStartFreq[MAX_NUM_OF_FILTERS]; /* lowest freq for lpc TABUL*/ INT tnsLimitOrder[MAX_NUM_OF_FILTERS]; /* Limit for TNS order TABUL*/ INT tnsFilterDirection[MAX_NUM_OF_FILTERS]; /* Filtering direction, 0=up, 1=down TABUL */ INT acfSplit[MAX_NUM_OF_FILTERS]; FIXP_DBL tnsTimeResolution[MAX_NUM_OF_FILTERS]; /* TNS max. time resolution TABUL. Should be fract but MSVC won't compile then */ INT seperateFiltersAllowed; } TNS_PARAMETER_TABULATED; typedef struct{ INT bitRateFrom[2]; /* noneSbr=0, useSbr=1 */ INT bitRateTo[2]; /* noneSbr=0, useSbr=1 */ TNS_PARAMETER_TABULATED paramTab[2]; /* mono=0, stereo=1 */ } TNS_INFO_TAB; #define TNS_TIMERES_SCALE (1) #define FL2_TIMERES_FIX(a) ( FL2FXCONST_DBL(a/(float)(1<= tnsInfoTab[i].bitRateFrom[sbrLd?1:0]) && bitRate <= tnsInfoTab[i].bitRateTo[sbrLd?1:0]) { tnsConfigTab = &tnsInfoTab[i].paramTab[(channels==1)?0:1]; } } return tnsConfigTab; } static INT getTnsMaxBands( const INT sampleRate, const INT granuleLength, const INT isShortBlock ) { int i; INT numBands = -1; const TNS_MAX_TAB_ENTRY *pMaxBandsTab = NULL; int maxBandsTabSize = 0; switch (granuleLength) { case 960: case 1024: pMaxBandsTab = tnsMaxBandsTab1024; maxBandsTabSize = sizeof(tnsMaxBandsTab1024)/sizeof(TNS_MAX_TAB_ENTRY); break; case 480: pMaxBandsTab = tnsMaxBandsTab480; maxBandsTabSize = sizeof(tnsMaxBandsTab480)/sizeof(TNS_MAX_TAB_ENTRY); break; case 512: pMaxBandsTab = tnsMaxBandsTab512; maxBandsTabSize = sizeof(tnsMaxBandsTab512)/sizeof(TNS_MAX_TAB_ENTRY); break; default: numBands = -1; } if (pMaxBandsTab!=NULL) { for (i=0; i= pMaxBandsTab[i].samplingRate) { break; } } } return numBands; } /***************************************************************************/ /*! \brief FDKaacEnc_FreqToBandWithRounding Returns index of nearest band border \param frequency \param sampling frequency \param total number of bands \param pointer to table of band borders \return band border ****************************************************************************/ INT FDKaacEnc_FreqToBandWithRounding( const INT freq, const INT fs, const INT numOfBands, const INT *bandStartOffset ) { INT lineNumber, band; /* assert(freq >= 0); */ lineNumber = (freq*bandStartOffset[numOfBands]*4/fs+1)/2; /* freq > fs/2 */ if (lineNumber >= bandStartOffset[numOfBands]) return numOfBands; /* find band the line number lies in */ for (band=0; bandlineNumber) break; } /* round to nearest band border */ if (lineNumber - bandStartOffset[band] > bandStartOffset[band+1] - lineNumber ) { band++; } return(band); } /***************************************************************************** functionname: FDKaacEnc_InitTnsConfiguration description: fill TNS_CONFIG structure with sensible content returns: input: bitrate, samplerate, number of channels, blocktype (long or short), TNS Config struct (modified), psy config struct, tns active flag output: *****************************************************************************/ AAC_ENCODER_ERROR FDKaacEnc_InitTnsConfiguration(INT bitRate, INT sampleRate, INT channels, INT blockType, INT granuleLength, INT ldSbrPresent, TNS_CONFIG *tC, PSY_CONFIGURATION *pC, INT active, INT useTnsPeak) { int i; //float acfTimeRes = (blockType == SHORT_WINDOW) ? 0.125f : 0.046875f; if (channels <= 0) return (AAC_ENCODER_ERROR)1; /* initialize TNS filter flag, order, and coefficient resolution (in bits per coeff) */ tC->tnsActive = (active) ? TRUE : FALSE; tC->maxOrder = (blockType == SHORT_WINDOW) ? 5 : 12; /* maximum: 7, 20 */ if (bitRate < 16000) tC->maxOrder -= 2; tC->coefRes = (blockType == SHORT_WINDOW) ? 3 : 4; /* LPC stop line: highest MDCT line to be coded, but do not go beyond TNS_MAX_BANDS! */ tC->lpcStopBand = getTnsMaxBands(sampleRate, granuleLength, (blockType == SHORT_WINDOW) ? 1 : 0); if (tC->lpcStopBand < 0) { return (AAC_ENCODER_ERROR)1; } tC->lpcStopBand = FDKmin(tC->lpcStopBand, pC->sfbActive); tC->lpcStopLine = pC->sfbOffset[tC->lpcStopBand]; switch (granuleLength) { case 960: case 1024: /* TNS start line: skip lower MDCT lines to prevent artifacts due to filter mismatch */ tC->lpcStartBand[LOFILT] = (blockType == SHORT_WINDOW) ? 0 : ((sampleRate < 18783) ? 4 : 8); tC->lpcStartLine[LOFILT] = pC->sfbOffset[tC->lpcStartBand[LOFILT]]; i = tC->lpcStopBand; while (pC->sfbOffset[i] > (tC->lpcStartLine[LOFILT] + (tC->lpcStopLine - tC->lpcStartLine[LOFILT]) / 4)) i--; tC->lpcStartBand[HIFILT] = i; tC->lpcStartLine[HIFILT] = pC->sfbOffset[i]; tC->confTab.threshOn[HIFILT] = 1437; tC->confTab.threshOn[LOFILT] = 1500; tC->confTab.tnsLimitOrder[HIFILT] = tC->maxOrder; tC->confTab.tnsLimitOrder[LOFILT] = tC->maxOrder - 7; tC->confTab.tnsFilterDirection[HIFILT] = FILTER_DIRECTION; tC->confTab.tnsFilterDirection[LOFILT] = FILTER_DIRECTION; tC->confTab.acfSplit[HIFILT] = -1; /* signal Merged4to2QuartersAutoCorrelation in FDKaacEnc_MergedAutoCorrelation*/ tC->confTab.acfSplit[LOFILT] = -1; /* signal Merged4to2QuartersAutoCorrelation in FDKaacEnc_MergedAutoCorrelation */ tC->confTab.filterEnabled[HIFILT] = 1; tC->confTab.filterEnabled[LOFILT] = 1; tC->confTab.seperateFiltersAllowed = 1; /* compute autocorrelation window based on maximum filter order for given block type */ /* for (i = 0; i <= tC->maxOrder + 3; i++) { float acfWinTemp = acfTimeRes * i; acfWindow[i] = FL2FXCONST_DBL(1.0f - acfWinTemp * acfWinTemp); } */ if (blockType == SHORT_WINDOW) { FDKmemcpy(tC->acfWindow[HIFILT], acfWindowShort, FDKmin(sizeof(acfWindowShort), sizeof(tC->acfWindow[HIFILT]))); FDKmemcpy(tC->acfWindow[LOFILT], acfWindowShort, FDKmin(sizeof(acfWindowShort), sizeof(tC->acfWindow[HIFILT]))); } else { FDKmemcpy(tC->acfWindow[HIFILT], acfWindowLong, FDKmin(sizeof(acfWindowLong), sizeof(tC->acfWindow[HIFILT]))); FDKmemcpy(tC->acfWindow[LOFILT], acfWindowLong, FDKmin(sizeof(acfWindowLong), sizeof(tC->acfWindow[HIFILT]))); } break; case 480: case 512: { const TNS_PARAMETER_TABULATED* pCfg = FDKaacEnc_GetTnsParam(bitRate, channels, ldSbrPresent); if ( pCfg != NULL ) { tC->lpcStartBand[HIFILT] = FDKaacEnc_FreqToBandWithRounding(pCfg->filterStartFreq[HIFILT], sampleRate, pC->sfbCnt, pC->sfbOffset); tC->lpcStartLine[HIFILT] = pC->sfbOffset[tC->lpcStartBand[HIFILT]]; tC->lpcStartBand[LOFILT] = FDKaacEnc_FreqToBandWithRounding(pCfg->filterStartFreq[LOFILT], sampleRate, pC->sfbCnt, pC->sfbOffset); tC->lpcStartLine[LOFILT] = pC->sfbOffset[tC->lpcStartBand[LOFILT]]; tC->confTab.threshOn[HIFILT] = pCfg->threshOn[HIFILT]; tC->confTab.threshOn[LOFILT] = pCfg->threshOn[LOFILT]; tC->confTab.tnsLimitOrder[HIFILT] = pCfg->tnsLimitOrder[HIFILT]; tC->confTab.tnsLimitOrder[LOFILT] = pCfg->tnsLimitOrder[LOFILT]; tC->confTab.tnsFilterDirection[HIFILT] = pCfg->tnsFilterDirection[HIFILT]; tC->confTab.tnsFilterDirection[LOFILT] = pCfg->tnsFilterDirection[LOFILT]; tC->confTab.acfSplit[HIFILT] = pCfg->acfSplit[HIFILT]; tC->confTab.acfSplit[LOFILT] = pCfg->acfSplit[LOFILT]; tC->confTab.filterEnabled[HIFILT] = pCfg->filterEnabled[HIFILT]; tC->confTab.filterEnabled[LOFILT] = pCfg->filterEnabled[LOFILT]; tC->confTab.seperateFiltersAllowed = pCfg->seperateFiltersAllowed; FDKaacEnc_CalcGaussWindow(tC->acfWindow[HIFILT], tC->maxOrder+1, sampleRate, granuleLength, pCfg->tnsTimeResolution[HIFILT], TNS_TIMERES_SCALE); FDKaacEnc_CalcGaussWindow(tC->acfWindow[LOFILT], tC->maxOrder+1, sampleRate, granuleLength, pCfg->tnsTimeResolution[LOFILT], TNS_TIMERES_SCALE); } else { tC->tnsActive = FALSE; /* no configuration available, disable tns tool */ } } break; default: tC->tnsActive = FALSE; /* no configuration available, disable tns tool */ } return AAC_ENC_OK; } /***************************************************************************/ /*! \brief FDKaacEnc_ScaleUpSpectrum Scales up spectrum lines in a given frequency section \param scaled spectrum \param original spectrum \param frequency line to start scaling \param frequency line to enc scaling \return scale factor ****************************************************************************/ static inline INT FDKaacEnc_ScaleUpSpectrum( FIXP_DBL *dest, const FIXP_DBL *src, const INT startLine, const INT stopLine ) { INT i, scale; FIXP_DBL maxVal = FL2FXCONST_DBL(0.f); /* Get highest value in given spectrum */ for (i=startLine; i>scale); } } else { for (i=startLine; i<(stopLine-lag); i++) { result += (fMult(spectrum[i], spectrum[i+lag])>>scale); } } return result; } /***************************************************************************/ /*! \brief FDKaacEnc_AutoCorrNormFac Autocorrelation function for 1st and 2nd half of the spectrum \param pointer to spectrum \param pointer to autocorrelation window \param filter start line ****************************************************************************/ static inline FIXP_DBL FDKaacEnc_AutoCorrNormFac( const FIXP_DBL value, const INT scale, INT *sc ) { #define HLM_MIN_NRG 0.0000000037252902984619140625f /* 2^-28 */ #define MAX_INV_NRGFAC (1.f/HLM_MIN_NRG) FIXP_DBL retValue; FIXP_DBL A, B; if (scale>=0) { A = value; B = FL2FXCONST_DBL(HLM_MIN_NRG)>>fixMin(DFRACT_BITS-1,scale); } else { A = value>>fixMin(DFRACT_BITS-1,(-scale)); B = FL2FXCONST_DBL(HLM_MIN_NRG); } if (A > B) { int shift = 0; FIXP_DBL tmp = invSqrtNorm2(value,&shift); retValue = fMult(tmp,tmp); *sc += (2*shift); } else { /* MAX_INV_NRGFAC*FDKpow(2,-28) = 1/2^-28 * 2^-28 = 1.0 */ retValue = /*FL2FXCONST_DBL(MAX_INV_NRGFAC*FDKpow(2,-28))*/ (FIXP_DBL)MAXVAL_DBL; *sc += scale+28; } return retValue; } static void FDKaacEnc_MergedAutoCorrelation( const FIXP_DBL *spectrum, const FIXP_DBL acfWindow[MAX_NUM_OF_FILTERS][TNS_MAX_ORDER+3+1], const INT lpcStartLine[MAX_NUM_OF_FILTERS], const INT lpcStopLine, const INT maxOrder, const INT acfSplit[MAX_NUM_OF_FILTERS], FIXP_DBL *_rxx1, FIXP_DBL *_rxx2 ) { int i, idx0, idx1, idx2, idx3, idx4, lag; FIXP_DBL rxx1_0, rxx2_0, rxx3_0, rxx4_0; /* buffer for temporal spectrum */ C_ALLOC_SCRATCH_START(pSpectrum, FIXP_DBL, (1024)); /* pre-initialization output */ FDKmemclear(&_rxx1[0], sizeof(FIXP_DBL)*(maxOrder+1)); FDKmemclear(&_rxx2[0], sizeof(FIXP_DBL)*(maxOrder+1)); /* MDCT line indices separating the 1st, 2nd, 3rd, and 4th analysis quarters */ if ( (acfSplit[LOFILT]==-1) || (acfSplit[HIFILT]==-1) ) { /* autocorrelation function for 1st, 2nd, 3rd, and 4th quarter of the spectrum */ idx0 = lpcStartLine[LOFILT]; i = lpcStopLine - lpcStartLine[LOFILT]; idx1 = idx0 + i / 4; idx2 = idx0 + i / 2; idx3 = idx0 + i * 3 / 4; idx4 = lpcStopLine; } else { FDK_ASSERT(acfSplit[LOFILT]==1); FDK_ASSERT(acfSplit[HIFILT]==3); i = (lpcStopLine - lpcStartLine[HIFILT]) / 3; idx0 = lpcStartLine[LOFILT]; idx1 = lpcStartLine[HIFILT]; idx2 = idx1 + i; idx3 = idx2 + i; idx4 = lpcStopLine; } /* copy spectrum to temporal buffer and scale up as much as possible */ INT sc1 = FDKaacEnc_ScaleUpSpectrum(pSpectrum, spectrum, idx0, idx1); INT sc2 = FDKaacEnc_ScaleUpSpectrum(pSpectrum, spectrum, idx1, idx2); INT sc3 = FDKaacEnc_ScaleUpSpectrum(pSpectrum, spectrum, idx2, idx3); INT sc4 = FDKaacEnc_ScaleUpSpectrum(pSpectrum, spectrum, idx3, idx4); /* get scaling values for summation */ INT nsc1, nsc2, nsc3, nsc4; for (nsc1=1; (1<dataRaw.Short.subBlockInfo[subBlockNumber] : &tnsData->dataRaw.Long.subBlockInfo; tnsData->filtersMerged = FALSE; tsbi->tnsActive = FALSE; tsbi->predictionGain = 1000; tnsInfo->numOfFilters[subBlockNumber] = 0; tnsInfo->coefRes[subBlockNumber] = tC->coefRes; for (i = 0; i < tC->maxOrder; i++) { tnsInfo->coef[subBlockNumber][HIFILT][i] = tnsInfo->coef[subBlockNumber][LOFILT][i] = 0; } tnsInfo->length[subBlockNumber][HIFILT] = tnsInfo->length[subBlockNumber][LOFILT] = 0; tnsInfo->order [subBlockNumber][HIFILT] = tnsInfo->order [subBlockNumber][LOFILT] = 0; if ( (tC->tnsActive) && (tC->maxOrder>0) ) { int sumSqrCoef; FDKaacEnc_MergedAutoCorrelation( spectrum, tC->acfWindow, tC->lpcStartLine, tC->lpcStopLine, tC->maxOrder, tC->confTab.acfSplit, rxx1, rxx2); /* compute higher TNS filter in lattice (ParCor) form with LeRoux-Gueguen algorithm */ tsbi->predictionGain = FDKaacEnc_AutoToParcor(rxx2, parcor_tmp, tC->confTab.tnsLimitOrder[HIFILT]); /* non-linear quantization of TNS lattice coefficients with given resolution */ FDKaacEnc_Parcor2Index( parcor_tmp, tnsInfo->coef[subBlockNumber][HIFILT], tC->confTab.tnsLimitOrder[HIFILT], tC->coefRes); /* reduce filter order by truncating trailing zeros, compute sum(abs(coefs)) */ for (i = tC->confTab.tnsLimitOrder[HIFILT] - 1; i >= 0; i--) { if (tnsInfo->coef[subBlockNumber][HIFILT][i] != 0) { break; } } tnsInfo->order[subBlockNumber][HIFILT] = i + 1; sumSqrCoef = 0; for (; i >= 0; i--) { sumSqrCoef += tnsInfo->coef[subBlockNumber][HIFILT][i] * tnsInfo->coef[subBlockNumber][HIFILT][i]; } tnsInfo->direction[subBlockNumber][HIFILT] = tC->confTab.tnsFilterDirection[HIFILT]; tnsInfo->length[subBlockNumber][HIFILT] = sfbCnt - tC->lpcStartBand[HIFILT]; /* disable TNS if predictionGain is less than 3dB or sumSqrCoef is too small */ if ((tsbi->predictionGain > tC->confTab.threshOn[HIFILT]) || (sumSqrCoef > (tC->confTab.tnsLimitOrder[HIFILT]/2 + 2))) { tsbi->tnsActive = TRUE; tnsInfo->numOfFilters[subBlockNumber]++; /* compute second filter for lower quarter; only allowed for long windows! */ if ( (blockType != SHORT_WINDOW) && (tC->confTab.filterEnabled[LOFILT]) && (tC->confTab.seperateFiltersAllowed) ) { /* compute second filter for lower frequencies */ /* compute TNS filter in lattice (ParCor) form with LeRoux-Gueguen algorithm */ INT predGain = FDKaacEnc_AutoToParcor(rxx1, parcor_tmp, tC->confTab.tnsLimitOrder[LOFILT]); /* non-linear quantization of TNS lattice coefficients with given resolution */ FDKaacEnc_Parcor2Index( parcor_tmp, tnsInfo->coef[subBlockNumber][LOFILT], tC->confTab.tnsLimitOrder[LOFILT], tC->coefRes); /* reduce filter order by truncating trailing zeros, compute sum(abs(coefs)) */ for (i = tC->confTab.tnsLimitOrder[LOFILT] - 1; i >= 0; i--) { if (tnsInfo->coef[subBlockNumber][LOFILT][i] != 0) { break; } } tnsInfo->order[subBlockNumber][LOFILT] = i + 1; sumSqrCoef = 0; for (; i >= 0; i--) { sumSqrCoef += tnsInfo->coef[subBlockNumber][LOFILT][i] * tnsInfo->coef[subBlockNumber][LOFILT][i]; } tnsInfo->direction[subBlockNumber][LOFILT] = tC->confTab.tnsFilterDirection[LOFILT]; tnsInfo->length[subBlockNumber][LOFILT] = tC->lpcStartBand[HIFILT] - tC->lpcStartBand[LOFILT]; /* filter lower quarter if gain is high enough, but not if it's too high */ if ( ( (predGain > tC->confTab.threshOn[LOFILT]) && (predGain < (16000 * tC->confTab.tnsLimitOrder[LOFILT])) ) || ( (sumSqrCoef > 9) && (sumSqrCoef < 22 * tC->confTab.tnsLimitOrder[LOFILT]) ) ) { /* compare lower to upper filter; if they are very similar, merge them */ sumSqrCoef = 0; for (i = 0; i < tC->confTab.tnsLimitOrder[LOFILT]; i++) { sumSqrCoef += FDKabs(tnsInfo->coef[subBlockNumber][HIFILT][i] - tnsInfo->coef[subBlockNumber][LOFILT][i]); } if ( (sumSqrCoef < 2) && (tnsInfo->direction[subBlockNumber][LOFILT] == tnsInfo->direction[subBlockNumber][HIFILT]) ) { tnsData->filtersMerged = TRUE; tnsInfo->length[subBlockNumber][HIFILT] = sfbCnt - tC->lpcStartBand[LOFILT]; for (; i < tnsInfo->order[subBlockNumber][HIFILT]; i++) { if (FDKabs(tnsInfo->coef[subBlockNumber][HIFILT][i]) > 1) { break; } } for (i--; i >= 0; i--) { if (tnsInfo->coef[subBlockNumber][HIFILT][i] != 0) { break; } } if (i < tnsInfo->order[subBlockNumber][HIFILT]) { tnsInfo->order[subBlockNumber][HIFILT] = i + 1; } } else { tnsInfo->numOfFilters[subBlockNumber]++; } } /* filter lower part */ } /* second filter allowed */ } /* if predictionGain > 1437 ... */ } /* maxOrder > 0 && tnsActive */ return 0; } /***************************************************************************/ /*! \brief FDKaacLdEnc_TnsSync synchronize TNS parameters when TNS gain difference small (relative) \param pointer to TNS data structure (destination) \param pointer to TNS data structure (source) \param pointer to TNS config structure \param number of sub-block \param block type \return void ****************************************************************************/ void FDKaacEnc_TnsSync( TNS_DATA *tnsDataDest, const TNS_DATA *tnsDataSrc, TNS_INFO *tnsInfoDest, TNS_INFO *tnsInfoSrc, const INT blockTypeDest, const INT blockTypeSrc, const TNS_CONFIG *tC ) { int i, w, absDiff, nWindows; TNS_SUBBLOCK_INFO *sbInfoDest; const TNS_SUBBLOCK_INFO *sbInfoSrc; /* if one channel contains short blocks and the other not, do not synchronize */ if ( (blockTypeSrc == SHORT_WINDOW && blockTypeDest != SHORT_WINDOW) || (blockTypeDest == SHORT_WINDOW && blockTypeSrc != SHORT_WINDOW) ) { return; } if (blockTypeDest != SHORT_WINDOW) { sbInfoDest = &tnsDataDest->dataRaw.Long.subBlockInfo; sbInfoSrc = &tnsDataSrc->dataRaw.Long.subBlockInfo; nWindows = 1; } else { sbInfoDest = &tnsDataDest->dataRaw.Short.subBlockInfo[0]; sbInfoSrc = &tnsDataSrc->dataRaw.Short.subBlockInfo[0]; nWindows = 8; } for (w=0; wtnsActive || pSbInfoSrcW->tnsActive) { for (i = 0; i < tC->maxOrder; i++) { absDiff = FDKabs(tnsInfoDest->coef[w][HIFILT][i] - tnsInfoSrc->coef[w][HIFILT][i]); absDiffSum += absDiff; /* if coefficients diverge too much between channels, do not synchronize */ if ((absDiff > 1) || (absDiffSum > 2)) { doSync = 0; break; } } if (doSync) { /* if no significant difference was detected, synchronize coefficient sets */ if (pSbInfoSrcW->tnsActive) { /* no dest filter, or more dest than source filters: use one dest filter */ if ((!pSbInfoDestW->tnsActive) || ((pSbInfoDestW->tnsActive) && (tnsInfoDest->numOfFilters[w] > tnsInfoSrc->numOfFilters[w]))) { pSbInfoDestW->tnsActive = tnsInfoDest->numOfFilters[w] = 1; } tnsDataDest->filtersMerged = tnsDataSrc->filtersMerged; tnsInfoDest->order [w][HIFILT] = tnsInfoSrc->order [w][HIFILT]; tnsInfoDest->length [w][HIFILT] = tnsInfoSrc->length [w][HIFILT]; tnsInfoDest->direction [w][HIFILT] = tnsInfoSrc->direction [w][HIFILT]; tnsInfoDest->coefCompress[w][HIFILT] = tnsInfoSrc->coefCompress[w][HIFILT]; for (i = 0; i < tC->maxOrder; i++) { tnsInfoDest->coef[w][HIFILT][i] = tnsInfoSrc->coef[w][HIFILT][i]; } } else pSbInfoDestW->tnsActive = tnsInfoDest->numOfFilters[w] = 0; } } } } /***************************************************************************/ /*! \brief FDKaacEnc_TnsEncode perform TNS encoding \param pointer to TNS info structure \param pointer to TNS data structure \param number of sfbs \param pointer to TNS config structure \param low-pass line \param pointer to spectrum \param number of sub-block \param block type \return ERROR STATUS ****************************************************************************/ INT FDKaacEnc_TnsEncode( TNS_INFO* tnsInfo, TNS_DATA* tnsData, const INT numOfSfb, const TNS_CONFIG *tC, const INT lowPassLine, FIXP_DBL* spectrum, const INT subBlockNumber, const INT blockType ) { INT i, startLine, stopLine; if ( ( (blockType == SHORT_WINDOW) && (!tnsData->dataRaw.Short.subBlockInfo[subBlockNumber].tnsActive) ) || ( (blockType != SHORT_WINDOW) && (!tnsData->dataRaw.Long.subBlockInfo.tnsActive) ) ) { return 1; } startLine = (tnsData->filtersMerged) ? tC->lpcStartLine[LOFILT] : tC->lpcStartLine[HIFILT]; stopLine = tC->lpcStopLine; for (i=0; inumOfFilters[subBlockNumber]; i++) { INT lpcGainFactor; FIXP_DBL LpcCoeff[TNS_MAX_ORDER]; FIXP_DBL workBuffer[TNS_MAX_ORDER]; FIXP_DBL parcor_tmp[TNS_MAX_ORDER]; FDKaacEnc_Index2Parcor( tnsInfo->coef[subBlockNumber][i], parcor_tmp, tnsInfo->order[subBlockNumber][i], tC->coefRes); lpcGainFactor = FDKaacEnc_ParcorToLpc( parcor_tmp, LpcCoeff, tnsInfo->order[subBlockNumber][i], workBuffer); FDKaacEnc_AnalysisFilter( &spectrum[startLine], stopLine - startLine, LpcCoeff, tnsInfo->order[subBlockNumber][i], lpcGainFactor); /* update for second filter */ startLine = tC->lpcStartLine[LOFILT]; stopLine = tC->lpcStartLine[HIFILT]; } return(0); } static void FDKaacEnc_CalcGaussWindow( FIXP_DBL *win, const int winSize, const INT samplingRate, const INT transformResolution, const FIXP_DBL timeResolution, const INT timeResolution_e ) { #define PI_SCALE (2) #define PI_FIX FL2FXCONST_DBL(3.1416f/(float)(1<> (DFRACT_BITS-1)); tmp = (FIXP_DBL)((LONG)workBuffer[0]^sign); if(input[0]=0; j--) { FIXP_DBL accu1 = fMult(tmp, input[j]); FIXP_DBL accu2 = fMult(tmp, workBuffer[j]); workBuffer[j] += accu1; input[j] += accu2; } workBuffer++; } tmp = fMult((FIXP_DBL)((LONG)TNS_PREDGAIN_SCALE<<21), fDivNorm(autoCorr_0, input[0], &scale)); predictionGain = (LONG)scaleValue(tmp,scale-21); return (predictionGain); } static INT FDKaacEnc_Search3(FIXP_DBL parcor) { INT i, index=0; for(i=0;i<8;i++){ if(parcor > FDKaacEnc_tnsCoeff3Borders[i]) index=i; } return(index-4); } static INT FDKaacEnc_Search4(FIXP_DBL parcor) { INT i, index=0; for(i=0;i<16;i++){ if(parcor > FDKaacEnc_tnsCoeff4Borders[i]) index=i; } return(index-8); } /***************************************************************************** functionname: FDKaacEnc_Parcor2Index *****************************************************************************/ static void FDKaacEnc_Parcor2Index( const FIXP_DBL *parcor, INT *RESTRICT index, const INT order, const INT bitsPerCoeff ) { INT i; for(i=0; i, ptr. to work buffer (required size: order) output: LPC coefficients *****************************************************************************/ static INT FDKaacEnc_ParcorToLpc( const FIXP_DBL *reflCoeff, FIXP_DBL *RESTRICT LpcCoeff, const INT numOfCoeff, FIXP_DBL *RESTRICT workBuffer ) { INT i, j; INT shiftval, par2LpcShiftVal = 6; /* 6 should be enough, bec. max(numOfCoeff) = 20 */ FIXP_DBL maxVal = FL2FXCONST_DBL(0.0f); LpcCoeff[0] = reflCoeff[0] >> par2LpcShiftVal; for(i=1; i> par2LpcShiftVal; } /* normalize LpcCoeff and calc shiftfactor */ for(i=0; i=par2LpcShiftVal) ? par2LpcShiftVal : shiftval; for(i=0; i0) { INT idx = 0; /* keep filter coefficients twice and save memory copy operation in modulo state buffer */ #if defined(ARCH_PREFER_MULT_32x16) FIXP_SGL coeff[2*TNS_MAX_ORDER]; const FIXP_SGL *pCoeff; for(i=0;i=0); signal[j] = (tmp<