/* ----------------------------------------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android © Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. All rights reserved. 1. INTRODUCTION The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. This FDK AAC Codec software is intended to be used on a wide variety of Android devices. AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part of the MPEG specifications. Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners individually for the purpose of encoding or decoding bit streams in products that are compliant with the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec software may already be covered under those patent licenses when it is used for those licensed purposes only. Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional applications information and documentation. 2. COPYRIGHT LICENSE Redistribution and use in source and binary forms, with or without modification, are permitted without payment of copyright license fees provided that you satisfy the following conditions: You must retain the complete text of this software license in redistributions of the FDK AAC Codec or your modifications thereto in source code form. You must retain the complete text of this software license in the documentation and/or other materials provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. You must make available free of charge copies of the complete source code of the FDK AAC Codec and your modifications thereto to recipients of copies in binary form. The name of Fraunhofer may not be used to endorse or promote products derived from this library without prior written permission. You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec software or your modifications thereto. Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software and the date of any change. For modified versions of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 3. NO PATENT LICENSE NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with respect to this software. You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized by appropriate patent licenses. 4. DISCLAIMER This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, including but not limited to procurement of substitute goods or services; loss of use, data, or profits, or business interruption, however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence), arising in any way out of the use of this software, even if advised of the possibility of such damage. 5. CONTACT INFORMATION Fraunhofer Institute for Integrated Circuits IIS Attention: Audio and Multimedia Departments - FDK AAC LL Am Wolfsmantel 33 91058 Erlangen, Germany www.iis.fraunhofer.de/amm amm-info@iis.fraunhofer.de ----------------------------------------------------------------------------------------------------------- */ /*! \file \brief parametric stereo decoder */ #include "psdec.h" #include "FDK_bitbuffer.h" #include "psdec_hybrid.h" #include "sbr_rom.h" #include "sbr_ram.h" #include "FDK_tools_rom.h" #include "genericStds.h" #include "FDK_trigFcts.h" /********************************************************************/ /* MLQUAL DEFINES */ /********************************************************************/ #define FRACT_ZERO FRACT_BITS-1 /********************************************************************/ SBR_ERROR ResetPsDec( HANDLE_PS_DEC h_ps_d ); void ResetPsDeCor( HANDLE_PS_DEC h_ps_d ); /***** HELPERS *****/ static void assignTimeSlotsPS (FIXP_DBL *bufAdr, FIXP_DBL **bufPtr, const int numSlots, const int numChan); /*******************/ #define DIV3 FL2FXCONST_DBL(1.f/3.f) /* division 3.0 */ #define DIV1_5 FL2FXCONST_DBL(2.f/3.f) /* division 1.5 */ /***************************************************************************/ /*! \brief Creates one instance of the PS_DEC struct \return Error info ****************************************************************************/ int CreatePsDec( HANDLE_PS_DEC *h_PS_DEC, /*!< pointer to the module state */ int aacSamplesPerFrame ) { SBR_ERROR errorInfo = SBRDEC_OK; HANDLE_PS_DEC h_ps_d; int i; if (*h_PS_DEC == NULL) { /* Get ps dec ram */ h_ps_d = GetRam_ps_dec(); if (h_ps_d == NULL) { errorInfo = SBRDEC_MEM_ALLOC_FAILED; goto bail; } } else { /* Reset an open instance */ h_ps_d = *h_PS_DEC; } /* initialisation */ switch (aacSamplesPerFrame) { case 960: h_ps_d->noSubSamples = 30; /* col */ break; case 1024: h_ps_d->noSubSamples = 32; /* col */ break; default: h_ps_d->noSubSamples = -1; break; } if (h_ps_d->noSubSamples > MAX_NUM_COL || h_ps_d->noSubSamples <= 0) { goto bail; } h_ps_d->noChannels = NO_QMF_CHANNELS; /* row */ h_ps_d->psDecodedPrv = 0; h_ps_d->procFrameBased = -1; for (i = 0; i < (1)+1; i++) { h_ps_d->bPsDataAvail[i] = ppt_none; } for (i = 0; i < (1)+1; i++) { FDKmemclear(&h_ps_d->bsData[i].mpeg, sizeof(MPEG_PS_BS_DATA)); } errorInfo = ResetPsDec( h_ps_d ); if ( errorInfo != SBRDEC_OK ) goto bail; ResetPsDeCor( h_ps_d ); *h_PS_DEC = h_ps_d; return 0; bail: DeletePsDec(&h_ps_d); return -1; } /*END CreatePsDec */ /***************************************************************************/ /*! \brief Delete one instance of the PS_DEC struct \return Error info ****************************************************************************/ int DeletePsDec( HANDLE_PS_DEC *h_PS_DEC) /*!< pointer to the module state */ { if (*h_PS_DEC == NULL) { return -1; } FreeRam_ps_dec(h_PS_DEC); return 0; } /*END DeletePsDec */ /***************************************************************************/ /*! \brief resets some values of the PS handle to default states \return ****************************************************************************/ SBR_ERROR ResetPsDec( HANDLE_PS_DEC h_ps_d ) /*!< pointer to the module state */ { SBR_ERROR errorInfo = SBRDEC_OK; INT i; const UCHAR noQmfBandsInHybrid20 = 3; /* const UCHAR noQmfBandsInHybrid34 = 5; */ const UCHAR aHybridResolution20[] = { HYBRID_8_CPLX, HYBRID_2_REAL, HYBRID_2_REAL }; h_ps_d->specificTo.mpeg.delayBufIndex = 0; /* explicitly init state variables to safe values (until first ps header arrives) */ h_ps_d->specificTo.mpeg.lastUsb = 0; h_ps_d->specificTo.mpeg.scaleFactorPsDelayBuffer = -(DFRACT_BITS-1); FDKmemclear(h_ps_d->specificTo.mpeg.aDelayBufIndexDelayQmf, (NO_QMF_CHANNELS-FIRST_DELAY_SB)*sizeof(UCHAR)); h_ps_d->specificTo.mpeg.noSampleDelay = delayIndexQmf[0]; for (i=0 ; i < NO_SERIAL_ALLPASS_LINKS; i++) { h_ps_d->specificTo.mpeg.aDelayRBufIndexSer[i] = 0; } h_ps_d->specificTo.mpeg.pAaRealDelayBufferQmf[0] = h_ps_d->specificTo.mpeg.aaQmfDelayBufReal; assignTimeSlotsPS ( h_ps_d->specificTo.mpeg.pAaRealDelayBufferQmf[0] + (NO_QMF_CHANNELS-FIRST_DELAY_SB), &h_ps_d->specificTo.mpeg.pAaRealDelayBufferQmf[1], h_ps_d->specificTo.mpeg.noSampleDelay-1, (NO_DELAY_BUFFER_BANDS-FIRST_DELAY_SB)); h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[0] = h_ps_d->specificTo.mpeg.aaQmfDelayBufImag; assignTimeSlotsPS ( h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[0] + (NO_QMF_CHANNELS-FIRST_DELAY_SB), &h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[1], h_ps_d->specificTo.mpeg.noSampleDelay-1, (NO_DELAY_BUFFER_BANDS-FIRST_DELAY_SB)); /* Hybrid Filter Bank 1 creation. */ errorInfo = InitHybridFilterBank ( &h_ps_d->specificTo.mpeg.hybrid, h_ps_d->noSubSamples, noQmfBandsInHybrid20, aHybridResolution20 ); for ( i = 0; i < NO_IID_GROUPS; i++ ) { h_ps_d->specificTo.mpeg.h11rPrev[i] = FL2FXCONST_DBL(0.5f); h_ps_d->specificTo.mpeg.h12rPrev[i] = FL2FXCONST_DBL(0.5f); } FDKmemclear( h_ps_d->specificTo.mpeg.h21rPrev, sizeof( h_ps_d->specificTo.mpeg.h21rPrev ) ); FDKmemclear( h_ps_d->specificTo.mpeg.h22rPrev, sizeof( h_ps_d->specificTo.mpeg.h22rPrev ) ); return errorInfo; } /***************************************************************************/ /*! \brief clear some buffers used in decorrelation process \return ****************************************************************************/ void ResetPsDeCor( HANDLE_PS_DEC h_ps_d ) /*!< pointer to the module state */ { INT i; FDKmemclear(h_ps_d->specificTo.mpeg.aPeakDecayFastBin, NO_MID_RES_BINS*sizeof(FIXP_DBL)); FDKmemclear(h_ps_d->specificTo.mpeg.aPrevNrgBin, NO_MID_RES_BINS*sizeof(FIXP_DBL)); FDKmemclear(h_ps_d->specificTo.mpeg.aPrevPeakDiffBin, NO_MID_RES_BINS*sizeof(FIXP_DBL)); FDKmemclear(h_ps_d->specificTo.mpeg.aPowerPrevScal, NO_MID_RES_BINS*sizeof(SCHAR)); for (i=0 ; i < FIRST_DELAY_SB ; i++) { FDKmemclear(h_ps_d->specificTo.mpeg.aaaRealDelayRBufferSerQmf[i], NO_DELAY_LENGTH_VECTORS*sizeof(FIXP_DBL)); FDKmemclear(h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerQmf[i], NO_DELAY_LENGTH_VECTORS*sizeof(FIXP_DBL)); } for (i=0 ; i < NO_SUB_QMF_CHANNELS ; i++) { FDKmemclear(h_ps_d->specificTo.mpeg.aaaRealDelayRBufferSerSubQmf[i], NO_DELAY_LENGTH_VECTORS*sizeof(FIXP_DBL)); FDKmemclear(h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerSubQmf[i], NO_DELAY_LENGTH_VECTORS*sizeof(FIXP_DBL)); } } /*******************************************************************************/ /* slot based funcion prototypes */ static void deCorrelateSlotBased( HANDLE_PS_DEC h_ps_d, FIXP_DBL *mHybridRealLeft, FIXP_DBL *mHybridImagLeft, SCHAR sf_mHybridLeft, FIXP_DBL *rIntBufferLeft, FIXP_DBL *iIntBufferLeft, SCHAR sf_IntBuffer, FIXP_DBL *mHybridRealRight, FIXP_DBL *mHybridImagRight, FIXP_DBL *rIntBufferRight, FIXP_DBL *iIntBufferRight ); static void applySlotBasedRotation( HANDLE_PS_DEC h_ps_d, FIXP_DBL *mHybridRealLeft, FIXP_DBL *mHybridImagLeft, FIXP_DBL *QmfLeftReal, FIXP_DBL *QmfLeftImag, FIXP_DBL *mHybridRealRight, FIXP_DBL *mHybridImagRight, FIXP_DBL *QmfRightReal, FIXP_DBL *QmfRightImag ); /***************************************************************************/ /*! \brief Get scale factor for all ps delay buffer. \return ****************************************************************************/ static int getScaleFactorPsStatesBuffer(HANDLE_PS_DEC h_ps_d) { INT i; int scale = DFRACT_BITS-1; for (i=0; ispecificTo.mpeg.hybrid.mQmfBufferRealSlot[i], NO_SUB_QMF_CHANNELS)); scale = fMin(scale, getScalefactor(h_ps_d->specificTo.mpeg.hybrid.mQmfBufferImagSlot[i], NO_SUB_QMF_CHANNELS)); } for (i=0; ispecificTo.mpeg.aaRealDelayBufferQmf[i], FIRST_DELAY_SB)); scale = fMin(scale, getScalefactor(h_ps_d->specificTo.mpeg.aaImagDelayBufferQmf[i], FIRST_DELAY_SB)); } for (i=0; ispecificTo.mpeg.aaRealDelayBufferSubQmf[i], NO_SUB_QMF_CHANNELS)); scale = fMin(scale, getScalefactor(h_ps_d->specificTo.mpeg.aaImagDelayBufferSubQmf[i], NO_SUB_QMF_CHANNELS)); } for (i=0; ispecificTo.mpeg.aaaRealDelayRBufferSerQmf[i], NO_DELAY_LENGTH_VECTORS)); scale = fMin(scale, getScalefactor(h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerQmf[i], NO_DELAY_LENGTH_VECTORS)); } for (i=0; ispecificTo.mpeg.aaaRealDelayRBufferSerSubQmf[i], NO_DELAY_LENGTH_VECTORS)); scale = fMin(scale, getScalefactor(h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerSubQmf[i], NO_DELAY_LENGTH_VECTORS)); } for (i=0; ispecificTo.mpeg.pAaRealDelayBufferQmf[i], len)); scale = fMin(scale, getScalefactor(h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[i], len)); } return (scale); } /***************************************************************************/ /*! \brief Rescale all ps delay buffer. \return ****************************************************************************/ static void scalePsStatesBuffer(HANDLE_PS_DEC h_ps_d, int scale) { INT i; if (scale < 0) scale = fixMax((INT)scale,(INT)-(DFRACT_BITS-1)); else scale = fixMin((INT)scale,(INT)DFRACT_BITS-1); for (i=0; ispecificTo.mpeg.hybrid.mQmfBufferRealSlot[i], NO_SUB_QMF_CHANNELS, scale ); scaleValues( h_ps_d->specificTo.mpeg.hybrid.mQmfBufferImagSlot[i], NO_SUB_QMF_CHANNELS, scale ); } for (i=0; ispecificTo.mpeg.aaRealDelayBufferQmf[i], FIRST_DELAY_SB, scale ); scaleValues( h_ps_d->specificTo.mpeg.aaImagDelayBufferQmf[i], FIRST_DELAY_SB, scale ); } for (i=0; ispecificTo.mpeg.aaRealDelayBufferSubQmf[i], NO_SUB_QMF_CHANNELS, scale ); scaleValues( h_ps_d->specificTo.mpeg.aaImagDelayBufferSubQmf[i], NO_SUB_QMF_CHANNELS, scale ); } for (i=0; ispecificTo.mpeg.aaaRealDelayRBufferSerQmf[i], NO_DELAY_LENGTH_VECTORS, scale ); scaleValues( h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerQmf[i], NO_DELAY_LENGTH_VECTORS, scale ); } for (i=0; ispecificTo.mpeg.aaaRealDelayRBufferSerSubQmf[i], NO_DELAY_LENGTH_VECTORS, scale ); scaleValues( h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerSubQmf[i], NO_DELAY_LENGTH_VECTORS, scale ); } for (i=0; ispecificTo.mpeg.pAaRealDelayBufferQmf[i], len, scale ); scaleValues( h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[i], len, scale ); } scale <<= 1; scaleValues( h_ps_d->specificTo.mpeg.aPeakDecayFastBin, NO_MID_RES_BINS, scale ); scaleValues( h_ps_d->specificTo.mpeg.aPrevPeakDiffBin, NO_MID_RES_BINS, scale ); scaleValues( h_ps_d->specificTo.mpeg.aPrevNrgBin, NO_MID_RES_BINS, scale ); } /***************************************************************************/ /*! \brief Scale input channel to the same scalefactor and rescale hybrid filterbank values \return ****************************************************************************/ void scalFilterBankValues( HANDLE_PS_DEC h_ps_d, FIXP_DBL **fixpQmfReal, FIXP_DBL **fixpQmfImag, int lsb, int scaleFactorLowBandSplitLow, int scaleFactorLowBandSplitHigh, SCHAR *scaleFactorLowBand_lb, SCHAR *scaleFactorLowBand_hb, int scaleFactorHighBands, INT *scaleFactorHighBand, INT noCols ) { INT maxScal; INT i; scaleFactorHighBands = -scaleFactorHighBands; scaleFactorLowBandSplitLow = -scaleFactorLowBandSplitLow; scaleFactorLowBandSplitHigh = -scaleFactorLowBandSplitHigh; /* get max scale factor */ maxScal = fixMax(scaleFactorHighBands,fixMax(scaleFactorLowBandSplitLow, scaleFactorLowBandSplitHigh )); { int headroom = getScaleFactorPsStatesBuffer(h_ps_d); maxScal = fixMax(maxScal,(INT)(h_ps_d->specificTo.mpeg.scaleFactorPsDelayBuffer-headroom)); maxScal += 1; } /* scale whole left channel to the same scale factor */ /* low band ( overlap buffer ) */ if ( maxScal != scaleFactorLowBandSplitLow ) { INT scale = scaleFactorLowBandSplitLow - maxScal; for ( i=0; i<(6); i++ ) { scaleValues( fixpQmfReal[i], lsb, scale ); scaleValues( fixpQmfImag[i], lsb, scale ); } } /* low band ( current frame ) */ if ( maxScal != scaleFactorLowBandSplitHigh ) { INT scale = scaleFactorLowBandSplitHigh - maxScal; /* for ( i=(6); i<(6)+MAX_NUM_COL; i++ ) { */ for ( i=(6); i<(6)+noCols; i++ ) { scaleValues( fixpQmfReal[i], lsb, scale ); scaleValues( fixpQmfImag[i], lsb, scale ); } } /* high band */ if ( maxScal != scaleFactorHighBands ) { INT scale = scaleFactorHighBands - maxScal; /* for ( i=0; ispecificTo.mpeg.scaleFactorPsDelayBuffer ) scalePsStatesBuffer(h_ps_d,(h_ps_d->specificTo.mpeg.scaleFactorPsDelayBuffer-maxScal)); h_ps_d->specificTo.mpeg.hybrid.sf_mQmfBuffer = maxScal; h_ps_d->specificTo.mpeg.scaleFactorPsDelayBuffer = maxScal; *scaleFactorHighBand += maxScal - scaleFactorHighBands; h_ps_d->rescal = maxScal - scaleFactorLowBandSplitHigh; h_ps_d->sf_IntBuffer = maxScal; *scaleFactorLowBand_lb += maxScal - scaleFactorLowBandSplitLow; *scaleFactorLowBand_hb += maxScal - scaleFactorLowBandSplitHigh; } void rescalFilterBankValues( HANDLE_PS_DEC h_ps_d, /* parametric stereo decoder handle */ FIXP_DBL **QmfBufferReal, /* qmf filterbank values */ FIXP_DBL **QmfBufferImag, /* qmf filterbank values */ int lsb, /* sbr start subband */ INT noCols) { int i; /* scale back 6 timeslots look ahead for hybrid filterbank to original value */ for ( i=noCols; irescal ); scaleValues( QmfBufferImag[i], lsb, h_ps_d->rescal ); } } /***************************************************************************/ /*! \brief Generate decorrelated side channel using allpass/delay \return ****************************************************************************/ static void deCorrelateSlotBased( HANDLE_PS_DEC h_ps_d, /*!< pointer to the module state */ FIXP_DBL *mHybridRealLeft, /*!< left (mono) hybrid values real */ FIXP_DBL *mHybridImagLeft, /*!< left (mono) hybrid values imag */ SCHAR sf_mHybridLeft, /*!< scalefactor for left (mono) hybrid bands */ FIXP_DBL *rIntBufferLeft, /*!< real qmf bands left (mono) (38x64) */ FIXP_DBL *iIntBufferLeft, /*!< real qmf bands left (mono) (38x64) */ SCHAR sf_IntBuffer, /*!< scalefactor for all left and right qmf bands */ FIXP_DBL *mHybridRealRight, /*!< right (decorrelated) hybrid values real */ FIXP_DBL *mHybridImagRight, /*!< right (decorrelated) hybrid values imag */ FIXP_DBL *rIntBufferRight, /*!< real qmf bands right (decorrelated) (38x64) */ FIXP_DBL *iIntBufferRight ) /*!< real qmf bands right (decorrelated) (38x64) */ { INT i, m, sb, gr, bin; FIXP_DBL peakDiff, nrg, transRatio; FIXP_DBL *RESTRICT aaLeftReal; FIXP_DBL *RESTRICT aaLeftImag; FIXP_DBL *RESTRICT aaRightReal; FIXP_DBL *RESTRICT aaRightImag; FIXP_DBL *RESTRICT pRealDelayBuffer; FIXP_DBL *RESTRICT pImagDelayBuffer; C_ALLOC_SCRATCH_START(aaPowerSlot, FIXP_DBL, NO_MID_RES_BINS); C_ALLOC_SCRATCH_START(aaTransRatioSlot, FIXP_DBL, NO_MID_RES_BINS); /*!
   parameter index       qmf bands             hybrid bands
  ----------------------------------------------------------------------------
         0                   0                      0,7
         1                   0                      1,6
         2                   0                      2
         3                   0                      3           HYBRID BANDS
         4                   1                      9
         5                   1                      8
         6                   2                     10
         7                   2                     11
  ----------------------------------------------------------------------------
         8                   3
         9                   4
        10                   5
        11                   6
        12                   7
        13                   8
        14                   9,10      (2 )                      QMF BANDS
        15                   11 - 13   (3 )
        16                   14 - 17   (4 )
        17                   18 - 22   (5 )
        18                   23 - 34   (12)
        19                   35 - 63   (29)
  ----------------------------------------------------------------------------
*/ #define FLTR_SCALE 3 /* hybrid bands (parameter index 0 - 7) */ aaLeftReal = mHybridRealLeft; aaLeftImag = mHybridImagLeft; aaPowerSlot[0] = ( fMultAddDiv2( fMultDiv2(aaLeftReal[0], aaLeftReal[0]), aaLeftImag[0], aaLeftImag[0] ) >> FLTR_SCALE ) + ( fMultAddDiv2( fMultDiv2(aaLeftReal[7], aaLeftReal[7]), aaLeftImag[7], aaLeftImag[7] ) >> FLTR_SCALE ); aaPowerSlot[1] = ( fMultAddDiv2( fMultDiv2(aaLeftReal[1], aaLeftReal[1]), aaLeftImag[1], aaLeftImag[1] ) >> FLTR_SCALE ) + ( fMultAddDiv2( fMultDiv2(aaLeftReal[6], aaLeftReal[6]), aaLeftImag[6], aaLeftImag[6] ) >> FLTR_SCALE ); aaPowerSlot[2] = fMultAddDiv2( fMultDiv2(aaLeftReal[2], aaLeftReal[2]), aaLeftImag[2], aaLeftImag[2] ) >> FLTR_SCALE; aaPowerSlot[3] = fMultAddDiv2( fMultDiv2(aaLeftReal[3], aaLeftReal[3]), aaLeftImag[3], aaLeftImag[3] ) >> FLTR_SCALE; aaPowerSlot[4] = fMultAddDiv2( fMultDiv2(aaLeftReal[9], aaLeftReal[9]), aaLeftImag[9], aaLeftImag[9] ) >> FLTR_SCALE; aaPowerSlot[5] = fMultAddDiv2( fMultDiv2(aaLeftReal[8], aaLeftReal[8]), aaLeftImag[8], aaLeftImag[8] ) >> FLTR_SCALE; aaPowerSlot[6] = fMultAddDiv2( fMultDiv2(aaLeftReal[10], aaLeftReal[10]), aaLeftImag[10], aaLeftImag[10] ) >> FLTR_SCALE; aaPowerSlot[7] = fMultAddDiv2( fMultDiv2(aaLeftReal[11], aaLeftReal[11]), aaLeftImag[11], aaLeftImag[11] ) >> FLTR_SCALE; /* qmf bands (parameter index 8 - 19) */ for ( bin = 8; bin < NO_MID_RES_BINS; bin++ ) { FIXP_DBL slotNrg = FL2FXCONST_DBL(0.f); for ( i = groupBorders20[bin+2]; i < groupBorders20[bin+3]; i++ ) { /* max loops: 29 */ slotNrg += fMultAddDiv2 ( fMultDiv2(rIntBufferLeft[i], rIntBufferLeft[i]), iIntBufferLeft[i], iIntBufferLeft[i]) >> FLTR_SCALE; } aaPowerSlot[bin] = slotNrg; } /* calculation of transient ratio */ for (bin=0; bin < NO_MID_RES_BINS; bin++) { /* noBins = 20 ( BASELINE_PS ) */ h_ps_d->specificTo.mpeg.aPeakDecayFastBin[bin] = fMult( h_ps_d->specificTo.mpeg.aPeakDecayFastBin[bin], PEAK_DECAY_FACTOR ); if (h_ps_d->specificTo.mpeg.aPeakDecayFastBin[bin] < aaPowerSlot[bin]) { h_ps_d->specificTo.mpeg.aPeakDecayFastBin[bin] = aaPowerSlot[bin]; } /* calculate PSmoothPeakDecayDiffNrg */ peakDiff = fMultAdd ( (h_ps_d->specificTo.mpeg.aPrevPeakDiffBin[bin]>>1), INT_FILTER_COEFF, h_ps_d->specificTo.mpeg.aPeakDecayFastBin[bin] - aaPowerSlot[bin] - h_ps_d->specificTo.mpeg.aPrevPeakDiffBin[bin]); /* save peakDiff for the next frame */ h_ps_d->specificTo.mpeg.aPrevPeakDiffBin[bin] = peakDiff; nrg = h_ps_d->specificTo.mpeg.aPrevNrgBin[bin] + fMult( INT_FILTER_COEFF, aaPowerSlot[bin] - h_ps_d->specificTo.mpeg.aPrevNrgBin[bin] ); /* Negative energies don't exist. But sometimes they appear due to rounding. */ nrg = fixMax(nrg,FL2FXCONST_DBL(0.f)); /* save nrg for the next frame */ h_ps_d->specificTo.mpeg.aPrevNrgBin[bin] = nrg; nrg = fMult( nrg, TRANSIENT_IMPACT_FACTOR ); /* save transient impact factor */ if ( peakDiff <= nrg || peakDiff == FL2FXCONST_DBL(0.0) ) { aaTransRatioSlot[bin] = (FIXP_DBL)MAXVAL_DBL /* FL2FXCONST_DBL(1.0f)*/; } else if ( nrg <= FL2FXCONST_DBL(0.0f) ) { aaTransRatioSlot[bin] = FL2FXCONST_DBL(0.f); } else { /* scale to denominator */ INT scale_left = fixMax(0, CntLeadingZeros(peakDiff) - 1); aaTransRatioSlot[bin] = schur_div( nrg<specificTo.mpeg.delayBufIndex; /* set delay indices */ pRealDelayBuffer = h_ps_d->specificTo.mpeg.aaRealDelayBufferSubQmf[TempDelay]; pImagDelayBuffer = h_ps_d->specificTo.mpeg.aaImagDelayBufferSubQmf[TempDelay]; aaLeftReal = mHybridRealLeft; aaLeftImag = mHybridImagLeft; aaRightReal = mHybridRealRight; aaRightImag = mHybridImagRight; /************************/ /* ICC groups : 0 - 9 */ /************************/ /* gr = ICC groups */ for (gr=0; gr < SUBQMF_GROUPS; gr++) { transRatio = aaTransRatioSlot[bins2groupMap20[gr]]; /* sb = subQMF/QMF subband */ sb = groupBorders20[gr]; /* Update delay buffers, sample delay allpass = 2 */ rTmp0 = pRealDelayBuffer[sb]; iTmp0 = pImagDelayBuffer[sb]; pRealDelayBuffer[sb] = aaLeftReal[sb]; pImagDelayBuffer[sb] = aaLeftImag[sb]; /* delay by fraction */ cplxMultDiv2(&rR0, &iR0, rTmp0, iTmp0, aaFractDelayPhaseFactorReSubQmf20[sb], aaFractDelayPhaseFactorImSubQmf20[sb]); rR0<<=1; iR0<<=1; FIXP_DBL *pAaaRealDelayRBufferSerSubQmf = h_ps_d->specificTo.mpeg.aaaRealDelayRBufferSerSubQmf[sb]; FIXP_DBL *pAaaImagDelayRBufferSerSubQmf = h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerSubQmf[sb]; for (m=0; mspecificTo.mpeg.aDelayRBufIndexSer[m]; /* get delayed values from according buffer : m(0)=3; m(1)=4; m(2)=5; */ rTmp0 = pAaaRealDelayRBufferSerSubQmf[tmpDelayRSer]; iTmp0 = pAaaImagDelayRBufferSerSubQmf[tmpDelayRSer]; /* delay by fraction */ cplxMultDiv2(&rTmp, &iTmp, rTmp0, iTmp0, aaFractDelayPhaseFactorSerReSubQmf20[sb][m], aaFractDelayPhaseFactorSerImSubQmf20[sb][m]); rTmp = (rTmp - fMultDiv2(aAllpassLinkDecaySer[m], rR0)) << 1; iTmp = (iTmp - fMultDiv2(aAllpassLinkDecaySer[m], iR0)) << 1; pAaaRealDelayRBufferSerSubQmf[tmpDelayRSer] = rR0 + fMult(aAllpassLinkDecaySer[m], rTmp); pAaaImagDelayRBufferSerSubQmf[tmpDelayRSer] = iR0 + fMult(aAllpassLinkDecaySer[m], iTmp); rR0 = rTmp; iR0 = iTmp; pAaaRealDelayRBufferSerSubQmf += aAllpassLinkDelaySer[m]; pAaaImagDelayRBufferSerSubQmf += aAllpassLinkDelaySer[m]; } /* m */ /* duck if a past transient is found */ aaRightReal[sb] = fMult(transRatio, rR0); aaRightImag[sb] = fMult(transRatio, iR0); } /* gr */ scaleValues( mHybridRealLeft, NO_SUB_QMF_CHANNELS, -SCAL_HEADROOM ); scaleValues( mHybridImagLeft, NO_SUB_QMF_CHANNELS, -SCAL_HEADROOM ); scaleValues( mHybridRealRight, NO_SUB_QMF_CHANNELS, -SCAL_HEADROOM ); scaleValues( mHybridImagRight, NO_SUB_QMF_CHANNELS, -SCAL_HEADROOM ); /************************/ aaLeftReal = rIntBufferLeft; aaLeftImag = iIntBufferLeft; aaRightReal = rIntBufferRight; aaRightImag = iIntBufferRight; pRealDelayBuffer = h_ps_d->specificTo.mpeg.aaRealDelayBufferQmf[TempDelay]; pImagDelayBuffer = h_ps_d->specificTo.mpeg.aaImagDelayBufferQmf[TempDelay]; /************************/ /* ICC groups : 10 - 19 */ /************************/ /* gr = ICC groups */ for (gr=SUBQMF_GROUPS; gr < NO_IID_GROUPS - NR_OF_DELAY_GROUPS; gr++) { transRatio = aaTransRatioSlot[bins2groupMap20[gr]]; /* sb = subQMF/QMF subband */ for (sb = groupBorders20[gr]; sb < groupBorders20[gr+1]; sb++) { FIXP_DBL resR, resI; /* decayScaleFactor = 1.0f + decay_cutoff * DECAY_SLOPE - DECAY_SLOPE * sb; DECAY_SLOPE = 0.05 */ FIXP_DBL decayScaleFactor = decayScaleFactTable[sb]; /* Update delay buffers, sample delay allpass = 2 */ rTmp0 = pRealDelayBuffer[sb]; iTmp0 = pImagDelayBuffer[sb]; pRealDelayBuffer[sb] = aaLeftReal[sb]; pImagDelayBuffer[sb] = aaLeftImag[sb]; /* delay by fraction */ cplxMultDiv2(&rR0, &iR0, rTmp0, iTmp0, aaFractDelayPhaseFactorReQmf[sb], aaFractDelayPhaseFactorImQmf[sb]); rR0<<=1; iR0<<=1; resR = fMult(decayScaleFactor, rR0); resI = fMult(decayScaleFactor, iR0); FIXP_DBL *pAaaRealDelayRBufferSerQmf = h_ps_d->specificTo.mpeg.aaaRealDelayRBufferSerQmf[sb]; FIXP_DBL *pAaaImagDelayRBufferSerQmf = h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerQmf[sb]; for (m=0; mspecificTo.mpeg.aDelayRBufIndexSer[m]; /* get delayed values from according buffer : m(0)=3; m(1)=4; m(2)=5; */ rTmp0 = pAaaRealDelayRBufferSerQmf[tmpDelayRSer]; iTmp0 = pAaaImagDelayRBufferSerQmf[tmpDelayRSer]; /* delay by fraction */ cplxMultDiv2(&rTmp, &iTmp, rTmp0, iTmp0, aaFractDelayPhaseFactorSerReQmf[sb][m], aaFractDelayPhaseFactorSerImQmf[sb][m]); rTmp = (rTmp - fMultDiv2(aAllpassLinkDecaySer[m], resR))<<1; iTmp = (iTmp - fMultDiv2(aAllpassLinkDecaySer[m], resI))<<1; resR = fMult(decayScaleFactor, rTmp); resI = fMult(decayScaleFactor, iTmp); pAaaRealDelayRBufferSerQmf[tmpDelayRSer] = rR0 + fMult(aAllpassLinkDecaySer[m], resR); pAaaImagDelayRBufferSerQmf[tmpDelayRSer] = iR0 + fMult(aAllpassLinkDecaySer[m], resI); rR0 = rTmp; iR0 = iTmp; pAaaRealDelayRBufferSerQmf += aAllpassLinkDelaySer[m]; pAaaImagDelayRBufferSerQmf += aAllpassLinkDelaySer[m]; } /* m */ /* duck if a past transient is found */ aaRightReal[sb] = fMult(transRatio, rR0); aaRightImag[sb] = fMult(transRatio, iR0); } /* sb */ } /* gr */ /************************/ /* ICC groups : 20, 21 */ /************************/ /* gr = ICC groups */ for (gr=DELAY_GROUP_OFFSET; gr < NO_IID_GROUPS; gr++) { INT sbStart = groupBorders20[gr]; INT sbStop = groupBorders20[gr+1]; UCHAR *pDelayBufIdx = &h_ps_d->specificTo.mpeg.aDelayBufIndexDelayQmf[sbStart-FIRST_DELAY_SB]; transRatio = aaTransRatioSlot[bins2groupMap20[gr]]; /* sb = subQMF/QMF subband */ for (sb = sbStart; sb < sbStop; sb++) { /* Update delay buffers */ rR0 = h_ps_d->specificTo.mpeg.pAaRealDelayBufferQmf[*pDelayBufIdx][sb-FIRST_DELAY_SB]; iR0 = h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[*pDelayBufIdx][sb-FIRST_DELAY_SB]; h_ps_d->specificTo.mpeg.pAaRealDelayBufferQmf[*pDelayBufIdx][sb-FIRST_DELAY_SB] = aaLeftReal[sb]; h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[*pDelayBufIdx][sb-FIRST_DELAY_SB] = aaLeftImag[sb]; /* duck if a past transient is found */ aaRightReal[sb] = fMult(transRatio, rR0); aaRightImag[sb] = fMult(transRatio, iR0); if (++(*pDelayBufIdx) >= delayIndexQmf[sb]) { *pDelayBufIdx = 0; } pDelayBufIdx++; } /* sb */ } /* gr */ /* Update delay buffer index */ if (++h_ps_d->specificTo.mpeg.delayBufIndex >= NO_SAMPLE_DELAY_ALLPASS) h_ps_d->specificTo.mpeg.delayBufIndex = 0; for (m=0; mspecificTo.mpeg.aDelayRBufIndexSer[m] >= aAllpassLinkDelaySer[m]) h_ps_d->specificTo.mpeg.aDelayRBufIndexSer[m] = 0; } scaleValues( &rIntBufferLeft[NO_QMF_BANDS_HYBRID20], NO_QMF_CHANNELS-NO_QMF_BANDS_HYBRID20, -SCAL_HEADROOM ); scaleValues( &iIntBufferLeft[NO_QMF_BANDS_HYBRID20], NO_QMF_CHANNELS-NO_QMF_BANDS_HYBRID20, -SCAL_HEADROOM ); scaleValues( &rIntBufferRight[NO_QMF_BANDS_HYBRID20], NO_QMF_CHANNELS-NO_QMF_BANDS_HYBRID20, -SCAL_HEADROOM ); scaleValues( &iIntBufferRight[NO_QMF_BANDS_HYBRID20], NO_QMF_CHANNELS-NO_QMF_BANDS_HYBRID20, -SCAL_HEADROOM ); /* free memory on scratch */ C_ALLOC_SCRATCH_END(aaTransRatioSlot, FIXP_DBL, NO_MID_RES_BINS); C_ALLOC_SCRATCH_END(aaPowerSlot, FIXP_DBL, NO_MID_RES_BINS); } void initSlotBasedRotation( HANDLE_PS_DEC h_ps_d, /*!< pointer to the module state */ int env, int usb ) { INT group = 0; INT bin = 0; INT noIidSteps, noFactors; /* const UCHAR *pQuantizedIIDs;*/ FIXP_SGL invL; FIXP_DBL ScaleL, ScaleR; FIXP_DBL Alpha, Beta, AlphasValue; FIXP_DBL h11r, h12r, h21r, h22r; const FIXP_DBL *PScaleFactors; /* Overwrite old values in delay buffers when upper subband is higher than in last frame */ if (env == 0) { if ((usb > h_ps_d->specificTo.mpeg.lastUsb) && h_ps_d->specificTo.mpeg.lastUsb) { INT i,k,length; for (i=h_ps_d->specificTo.mpeg.lastUsb ; i < FIRST_DELAY_SB; i++) { FDKmemclear(h_ps_d->specificTo.mpeg.aaaRealDelayRBufferSerQmf[i], NO_DELAY_LENGTH_VECTORS*sizeof(FIXP_DBL)); FDKmemclear(h_ps_d->specificTo.mpeg.aaaImagDelayRBufferSerQmf[i], NO_DELAY_LENGTH_VECTORS*sizeof(FIXP_DBL)); } for (k=0 ; kspecificTo.mpeg.pAaRealDelayBufferQmf[k], FIRST_DELAY_SB*sizeof(FIXP_DBL)); } length = (usb-FIRST_DELAY_SB)*sizeof(FIXP_DBL); if(length>0) { FDKmemclear(h_ps_d->specificTo.mpeg.pAaRealDelayBufferQmf[0], length); FDKmemclear(h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[0], length); } length = (fixMin(NO_DELAY_BUFFER_BANDS,(INT)usb)-FIRST_DELAY_SB)*sizeof(FIXP_DBL); if(length>0) { for (k=1 ; k < h_ps_d->specificTo.mpeg.noSampleDelay; k++) { FDKmemclear(h_ps_d->specificTo.mpeg.pAaRealDelayBufferQmf[k], length); FDKmemclear(h_ps_d->specificTo.mpeg.pAaImagDelayBufferQmf[k], length); } } } h_ps_d->specificTo.mpeg.lastUsb = usb; } /* env == 0 */ if (h_ps_d->bsData[h_ps_d->processSlot].mpeg.bFineIidQ) { PScaleFactors = ScaleFactorsFine; /* values are shiftet right by one */ noIidSteps = NO_IID_STEPS_FINE; noFactors = NO_IID_LEVELS_FINE; /*pQuantizedIIDs = quantizedIIDsFine;*/ } else { PScaleFactors = ScaleFactors; /* values are shiftet right by one */ noIidSteps = NO_IID_STEPS; noFactors = NO_IID_LEVELS; /*pQuantizedIIDs = quantizedIIDs;*/ } /* dequantize and decode */ for ( group = 0; group < NO_IID_GROUPS; group++ ) { bin = bins2groupMap20[group]; /*!

type 'A' rotation

mixing procedure R_a, used in baseline version
Scale-factor vectors c1 and c2 are precalculated in initPsTables () and stored in scaleFactors[] and scaleFactorsFine[] = pScaleFactors []. From the linearized IID parameters (intensity differences), two scale factors are calculated. They are used to obtain the coefficients h11... h22. */ /* ScaleR and ScaleL are scaled by 1 shift right */ ScaleL = ScaleR = 0; if (noIidSteps + h_ps_d->specificTo.mpeg.coef.aaIidIndexMapped[env][bin] >= 0 && noIidSteps + h_ps_d->specificTo.mpeg.coef.aaIidIndexMapped[env][bin] < noFactors) ScaleR = PScaleFactors[noIidSteps + h_ps_d->specificTo.mpeg.coef.aaIidIndexMapped[env][bin]]; if (noIidSteps - h_ps_d->specificTo.mpeg.coef.aaIidIndexMapped[env][bin] >= 0 && noIidSteps - h_ps_d->specificTo.mpeg.coef.aaIidIndexMapped[env][bin] < noFactors) ScaleL = PScaleFactors[noIidSteps - h_ps_d->specificTo.mpeg.coef.aaIidIndexMapped[env][bin]]; AlphasValue = 0; if (h_ps_d->specificTo.mpeg.coef.aaIccIndexMapped[env][bin] >= 0) AlphasValue = Alphas[h_ps_d->specificTo.mpeg.coef.aaIccIndexMapped[env][bin]]; Beta = fMult (fMult( AlphasValue, ( ScaleR - ScaleL )), FIXP_SQRT05); Alpha = AlphasValue>>1; /* Alpha and Beta are now both scaled by 2 shifts right */ /* calculate the coefficients h11... h22 from scale-factors and ICC parameters */ /* h values are scaled by 1 shift right */ { FIXP_DBL trigData[4]; inline_fixp_cos_sin(Beta + Alpha, Beta - Alpha, 2, trigData); h11r = fMult( ScaleL, trigData[0]); h12r = fMult( ScaleR, trigData[2]); h21r = fMult( ScaleL, trigData[1]); h22r = fMult( ScaleR, trigData[3]); } /*****************************************************************************************/ /* Interpolation of the matrices H11... H22: */ /* */ /* H11(k,n) = H11(k,n[e]) + (n-n[e]) * (H11(k,n[e+1] - H11(k,n[e])) / (n[e+1] - n[e]) */ /* ... */ /*****************************************************************************************/ /* invL = 1/(length of envelope) */ invL = FX_DBL2FX_SGL(GetInvInt(h_ps_d->bsData[h_ps_d->processSlot].mpeg.aEnvStartStop[env + 1] - h_ps_d->bsData[h_ps_d->processSlot].mpeg.aEnvStartStop[env])); h_ps_d->specificTo.mpeg.coef.H11r[group] = h_ps_d->specificTo.mpeg.h11rPrev[group]; h_ps_d->specificTo.mpeg.coef.H12r[group] = h_ps_d->specificTo.mpeg.h12rPrev[group]; h_ps_d->specificTo.mpeg.coef.H21r[group] = h_ps_d->specificTo.mpeg.h21rPrev[group]; h_ps_d->specificTo.mpeg.coef.H22r[group] = h_ps_d->specificTo.mpeg.h22rPrev[group]; h_ps_d->specificTo.mpeg.coef.DeltaH11r[group] = fMult ( h11r - h_ps_d->specificTo.mpeg.coef.H11r[group], invL ); h_ps_d->specificTo.mpeg.coef.DeltaH12r[group] = fMult ( h12r - h_ps_d->specificTo.mpeg.coef.H12r[group], invL ); h_ps_d->specificTo.mpeg.coef.DeltaH21r[group] = fMult ( h21r - h_ps_d->specificTo.mpeg.coef.H21r[group], invL ); h_ps_d->specificTo.mpeg.coef.DeltaH22r[group] = fMult ( h22r - h_ps_d->specificTo.mpeg.coef.H22r[group], invL ); /* update prev coefficients for interpolation in next envelope */ h_ps_d->specificTo.mpeg.h11rPrev[group] = h11r; h_ps_d->specificTo.mpeg.h12rPrev[group] = h12r; h_ps_d->specificTo.mpeg.h21rPrev[group] = h21r; h_ps_d->specificTo.mpeg.h22rPrev[group] = h22r; } /* group loop */ } static void applySlotBasedRotation( HANDLE_PS_DEC h_ps_d, /*!< pointer to the module state */ FIXP_DBL *mHybridRealLeft, /*!< hybrid values real left */ FIXP_DBL *mHybridImagLeft, /*!< hybrid values imag left */ FIXP_DBL *QmfLeftReal, /*!< real bands left qmf channel */ FIXP_DBL *QmfLeftImag, /*!< imag bands left qmf channel */ FIXP_DBL *mHybridRealRight, /*!< hybrid values real right */ FIXP_DBL *mHybridImagRight, /*!< hybrid values imag right */ FIXP_DBL *QmfRightReal, /*!< real bands right qmf channel */ FIXP_DBL *QmfRightImag /*!< imag bands right qmf channel */ ) { INT group; INT subband; FIXP_DBL *RESTRICT HybrLeftReal; FIXP_DBL *RESTRICT HybrLeftImag; FIXP_DBL *RESTRICT HybrRightReal; FIXP_DBL *RESTRICT HybrRightImag; FIXP_DBL tmpLeft, tmpRight; /**********************************************************************************************/ /*!

Mapping

The number of stereo bands that is actually used depends on the number of availble parameters for IID and ICC:
   nr. of IID para.| nr. of ICC para. | nr. of Stereo bands
   ----------------|------------------|-------------------
     10,20         |     10,20        |        20
     10,20         |     34           |        34
     34            |     10,20        |        34
     34            |     34           |        34
  
In the case the number of parameters for IIS and ICC differs from the number of stereo bands, a mapping from the lower number to the higher number of parameters is applied. Index mapping of IID and ICC parameters is already done in psbitdec.cpp. Further mapping is not needed here in baseline version. **********************************************************************************************/ /************************************************************************************************/ /*!

Mixing

To generate the QMF subband signals for the subband samples n = n[e]+1 ,,, n_[e+1] the parameters at position n[e] and n[e+1] are required as well as the subband domain signals s_k(n) and d_k(n) for n = n[e]+1... n_[e+1]. n[e] represents the start position for envelope e. The border positions n[e] are handled in DecodePS(). The stereo sub subband signals are constructed as:
  l_k(n) = H11(k,n) s_k(n) + H21(k,n) d_k(n)
  r_k(n) = H21(k,n) s_k(n) + H22(k,n) d_k(n)
  
In order to obtain the matrices H11(k,n)... H22 (k,n), the vectors h11(b)... h22(b) need to be calculated first (b: parameter index). Depending on ICC mode either mixing procedure R_a or R_b is used for that. For both procedures, the parameters for parameter position n[e+1] is used. ************************************************************************************************/ /************************************************************************************************/ /*!

Phase parameters

With disabled phase parameters (which is the case in baseline version), the H-matrices are just calculated by:
  H11(k,n[e+1] = h11(b(k))
  (...)
  b(k): parameter index according to mapping table
  

Processing of the samples in the sub subbands

this loop includes the interpolation of the coefficients Hxx ************************************************************************************************/ /* loop thru all groups ... */ HybrLeftReal = mHybridRealLeft; HybrLeftImag = mHybridImagLeft; HybrRightReal = mHybridRealRight; HybrRightImag = mHybridImagRight; /******************************************************/ /* construct stereo sub subband signals according to: */ /* */ /* l_k(n) = H11(k,n) s_k(n) + H21(k,n) d_k(n) */ /* r_k(n) = H12(k,n) s_k(n) + H22(k,n) d_k(n) */ /******************************************************/ for ( group = 0; group < SUBQMF_GROUPS; group++ ) { h_ps_d->specificTo.mpeg.coef.H11r[group] += h_ps_d->specificTo.mpeg.coef.DeltaH11r[group]; h_ps_d->specificTo.mpeg.coef.H12r[group] += h_ps_d->specificTo.mpeg.coef.DeltaH12r[group]; h_ps_d->specificTo.mpeg.coef.H21r[group] += h_ps_d->specificTo.mpeg.coef.DeltaH21r[group]; h_ps_d->specificTo.mpeg.coef.H22r[group] += h_ps_d->specificTo.mpeg.coef.DeltaH22r[group]; subband = groupBorders20[group]; tmpLeft = fMultAddDiv2( fMultDiv2(h_ps_d->specificTo.mpeg.coef.H11r[group], HybrLeftReal[subband]), h_ps_d->specificTo.mpeg.coef.H21r[group], HybrRightReal[subband]); tmpRight = fMultAddDiv2( fMultDiv2(h_ps_d->specificTo.mpeg.coef.H12r[group], HybrLeftReal[subband]), h_ps_d->specificTo.mpeg.coef.H22r[group], HybrRightReal[subband]); HybrLeftReal [subband] = tmpLeft<<1; HybrRightReal[subband] = tmpRight<<1; tmpLeft = fMultAdd( fMultDiv2(h_ps_d->specificTo.mpeg.coef.H11r[group], HybrLeftImag[subband]), h_ps_d->specificTo.mpeg.coef.H21r[group], HybrRightImag[subband]); tmpRight = fMultAdd( fMultDiv2(h_ps_d->specificTo.mpeg.coef.H12r[group], HybrLeftImag[subband]), h_ps_d->specificTo.mpeg.coef.H22r[group], HybrRightImag[subband]); HybrLeftImag [subband] = tmpLeft; HybrRightImag[subband] = tmpRight; } /* continue in the qmf buffers */ HybrLeftReal = QmfLeftReal; HybrLeftImag = QmfLeftImag; HybrRightReal = QmfRightReal; HybrRightImag = QmfRightImag; for (; group < NO_IID_GROUPS; group++ ) { h_ps_d->specificTo.mpeg.coef.H11r[group] += h_ps_d->specificTo.mpeg.coef.DeltaH11r[group]; h_ps_d->specificTo.mpeg.coef.H12r[group] += h_ps_d->specificTo.mpeg.coef.DeltaH12r[group]; h_ps_d->specificTo.mpeg.coef.H21r[group] += h_ps_d->specificTo.mpeg.coef.DeltaH21r[group]; h_ps_d->specificTo.mpeg.coef.H22r[group] += h_ps_d->specificTo.mpeg.coef.DeltaH22r[group]; for ( subband = groupBorders20[group]; subband < groupBorders20[group + 1]; subband++ ) { tmpLeft = fMultAdd( fMultDiv2(h_ps_d->specificTo.mpeg.coef.H11r[group], HybrLeftReal[subband]), h_ps_d->specificTo.mpeg.coef.H21r[group], HybrRightReal[subband]); tmpRight = fMultAdd( fMultDiv2(h_ps_d->specificTo.mpeg.coef.H12r[group], HybrLeftReal[subband]), h_ps_d->specificTo.mpeg.coef.H22r[group], HybrRightReal[subband]); HybrLeftReal [subband] = tmpLeft; HybrRightReal[subband] = tmpRight; tmpLeft = fMultAdd( fMultDiv2(h_ps_d->specificTo.mpeg.coef.H11r[group], HybrLeftImag[subband]), h_ps_d->specificTo.mpeg.coef.H21r[group], HybrRightImag[subband]); tmpRight = fMultAdd( fMultDiv2(h_ps_d->specificTo.mpeg.coef.H12r[group], HybrLeftImag[subband]), h_ps_d->specificTo.mpeg.coef.H22r[group], HybrRightImag[subband]); HybrLeftImag [subband] = tmpLeft; HybrRightImag[subband] = tmpRight; } /* subband */ } } /***************************************************************************/ /*! \brief Applies IID, ICC, IPD and OPD parameters to the current frame. \return none ****************************************************************************/ void ApplyPsSlot( HANDLE_PS_DEC h_ps_d, /*!< handle PS_DEC*/ FIXP_DBL **rIntBufferLeft, /*!< real bands left qmf channel (38x64) */ FIXP_DBL **iIntBufferLeft, /*!< imag bands left qmf channel (38x64) */ FIXP_DBL *rIntBufferRight, /*!< real bands right qmf channel (38x64) */ FIXP_DBL *iIntBufferRight /*!< imag bands right qmf channel (38x64) */ ) { /*! The 64-band QMF representation of the monaural signal generated by the SBR tool is used as input of the PS tool. After the PS processing, the outputs of the left and right hybrid synthesis filterbanks are used to generate the stereo output signal.

             -------------            ----------            -------------
            | Hybrid      | M_n[k,m] |          | L_n[k,m] | Hybrid      | l[n]
   m[n] --->| analysis    |--------->|          |--------->| synthesis   |----->
            | filter bank |          |          |          | filter bank |
             -------------           | Stereo   |           -------------
                   |                 | recon-   |
                   |                 | stuction |
                  \|/                |          |
             -------------           |          |
            | De-         | D_n[k,m] |          |
            | correlation |--------->|          |
             -------------           |          |           -------------
                                     |          | R_n[k,m] | Hybrid      | r[n]
                                     |          |--------->| synthesis   |----->
   IID, ICC ------------------------>|          |          | filter bank |
  (IPD, OPD)                          ----------            -------------

  m[n]:      QMF represantation of the mono input
  M_n[k,m]:  (sub-)sub-band domain signals of the mono input
  D_n[k,m]:  decorrelated (sub-)sub-band domain signals
  L_n[k,m]:  (sub-)sub-band domain signals of the left output
  R_n[k,m]:  (sub-)sub-band domain signals of the right output
  l[n],r[n]: left/right output signals

  
*/ /* get temporary hybrid qmf values of one timeslot */ C_ALLOC_SCRATCH_START(hybridRealLeft, FIXP_DBL, NO_SUB_QMF_CHANNELS); C_ALLOC_SCRATCH_START(hybridImagLeft, FIXP_DBL, NO_SUB_QMF_CHANNELS); C_ALLOC_SCRATCH_START(hybridRealRight, FIXP_DBL, NO_SUB_QMF_CHANNELS); C_ALLOC_SCRATCH_START(hybridImagRight, FIXP_DBL, NO_SUB_QMF_CHANNELS); SCHAR sf_IntBuffer = h_ps_d->sf_IntBuffer; /* clear workbuffer */ FDKmemclear(hybridRealLeft, NO_SUB_QMF_CHANNELS*sizeof(FIXP_DBL)); FDKmemclear(hybridImagLeft, NO_SUB_QMF_CHANNELS*sizeof(FIXP_DBL)); FDKmemclear(hybridRealRight, NO_SUB_QMF_CHANNELS*sizeof(FIXP_DBL)); FDKmemclear(hybridImagRight, NO_SUB_QMF_CHANNELS*sizeof(FIXP_DBL)); /*! Hybrid analysis filterbank: The lower 3 (5) of the 64 QMF subbands are further split to provide better frequency resolution. for PS processing. For the 10 and 20 stereo bands configuration, the QMF band H_0(w) is split up into 8 (sub-) sub-bands and the QMF bands H_1(w) and H_2(w) are spit into 2 (sub-) 4th. (See figures 8.20 and 8.22 of ISO/IEC 14496-3:2001/FDAM 2:2004(E) ) */ if (h_ps_d->procFrameBased == 1) /* If we have switched from frame to slot based processing */ { /* fill hybrid delay buffer. */ h_ps_d->procFrameBased = 0; fillHybridDelayLine( rIntBufferLeft, iIntBufferLeft, hybridRealLeft, hybridImagLeft, hybridRealRight, hybridImagRight, &h_ps_d->specificTo.mpeg.hybrid ); } slotBasedHybridAnalysis ( rIntBufferLeft[HYBRID_FILTER_DELAY], /* qmf filterbank values */ iIntBufferLeft[HYBRID_FILTER_DELAY], /* qmf filterbank values */ hybridRealLeft, /* hybrid filterbank values */ hybridImagLeft, /* hybrid filterbank values */ &h_ps_d->specificTo.mpeg.hybrid); /* hybrid filterbank handle */ SCHAR hybridScal = h_ps_d->specificTo.mpeg.hybrid.sf_mQmfBuffer; /*! Decorrelation: By means of all-pass filtering and delaying, the (sub-)sub-band samples s_k(n) are converted into de-correlated (sub-)sub-band samples d_k(n). - k: frequency in hybrid spectrum - n: time index */ deCorrelateSlotBased( h_ps_d, /* parametric stereo decoder handle */ hybridRealLeft, /* left hybrid time slot */ hybridImagLeft, hybridScal, /* scale factor of left hybrid time slot */ rIntBufferLeft[0], /* left qmf time slot */ iIntBufferLeft[0], sf_IntBuffer, /* scale factor of left and right qmf time slot */ hybridRealRight, /* right hybrid time slot */ hybridImagRight, rIntBufferRight, /* right qmf time slot */ iIntBufferRight ); /*! Stereo Processing: The sets of (sub-)sub-band samples s_k(n) and d_k(n) are processed according to the stereo cues which are defined per stereo band. */ applySlotBasedRotation( h_ps_d, /* parametric stereo decoder handle */ hybridRealLeft, /* left hybrid time slot */ hybridImagLeft, rIntBufferLeft[0], /* left qmf time slot */ iIntBufferLeft[0], hybridRealRight, /* right hybrid time slot */ hybridImagRight, rIntBufferRight, /* right qmf time slot */ iIntBufferRight ); /*! Hybrid synthesis filterbank: The stereo processed hybrid subband signals l_k(n) and r_k(n) are fed into the hybrid synthesis filterbanks which are identical to the 64 complex synthesis filterbank of the SBR tool. The input to the filterbank are slots of 64 QMF samples. For each slot the filterbank outputs one block of 64 samples of one reconstructed stereo channel. The hybrid synthesis filterbank is computed seperatly for the left and right channel. */ /* left channel */ slotBasedHybridSynthesis ( hybridRealLeft, /* one timeslot of hybrid filterbank values */ hybridImagLeft, rIntBufferLeft[0], /* one timeslot of qmf filterbank values */ iIntBufferLeft[0], &h_ps_d->specificTo.mpeg.hybrid ); /* hybrid filterbank handle */ /* right channel */ slotBasedHybridSynthesis ( hybridRealRight, /* one timeslot of hybrid filterbank values */ hybridImagRight, rIntBufferRight, /* one timeslot of qmf filterbank values */ iIntBufferRight, &h_ps_d->specificTo.mpeg.hybrid ); /* hybrid filterbank handle */ /* free temporary hybrid qmf values of one timeslot */ C_ALLOC_SCRATCH_END(hybridImagRight, FIXP_DBL, NO_SUB_QMF_CHANNELS); C_ALLOC_SCRATCH_END(hybridRealRight, FIXP_DBL, NO_SUB_QMF_CHANNELS); C_ALLOC_SCRATCH_END(hybridImagLeft, FIXP_DBL, NO_SUB_QMF_CHANNELS); C_ALLOC_SCRATCH_END(hybridRealLeft, FIXP_DBL, NO_SUB_QMF_CHANNELS); }/* END ApplyPsSlot */ /***************************************************************************/ /*! \brief assigns timeslots to an array \return ****************************************************************************/ static void assignTimeSlotsPS (FIXP_DBL *bufAdr, FIXP_DBL **bufPtr, const int numSlots, const int numChan) { FIXP_DBL *ptr; int slot; ptr = bufAdr; for(slot=0; slot < numSlots; slot++) { bufPtr [slot] = ptr; ptr += numChan; } }