/* ----------------------------------------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android © Copyright 1995 - 2012 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 Sbr decoder This module provides the actual decoder implementation. The SBR data (side information) is already decoded. Only three functions are provided: \li 1.) createSbrDec(): One time initialization \li 2.) resetSbrDec(): Called by sbr_Apply() when the information contained in an SBR_HEADER_ELEMENT requires a reset and recalculation of important SBR structures. \li 3.) sbr_dec(): The actual decoder. Calls the different tools such as filterbanks, lppTransposer(), and calculateSbrEnvelope() [the envelope adjuster]. \sa sbr_dec(), \ref documentationOverview */ #include "sbr_dec.h" #include "sbr_ram.h" #include "env_extr.h" #include "env_calc.h" #include "scale.h" #include "genericStds.h" #include "sbrdec_drc.h" static void assignLcTimeSlots( HANDLE_SBR_DEC hSbrDec, /*!< handle to Decoder channel */ FIXP_DBL **QmfBufferReal, int noCols ) { int slot, i; FIXP_DBL *ptr; /* Number of QMF timeslots in the overlap buffer: */ ptr = hSbrDec->pSbrOverlapBuffer; for(slot=0; slotLppTrans.pSettings->overlap; slot++) { QmfBufferReal[slot] = ptr; ptr += (64); } /* Assign timeslots to Workbuffer1 */ ptr = hSbrDec->WorkBuffer1; for(i=0; i> 1) + hSbrDec->LppTrans.pSettings->overlap; int totCols = noCols + hSbrDec->LppTrans.pSettings->overlap; /* Number of QMF timeslots in the overlap buffer: */ ptr = hSbrDec->pSbrOverlapBuffer; for(slot=0; slotLppTrans.pSettings->overlap; slot++) { QmfBufferReal[slot] = ptr; ptr += (64); QmfBufferImag[slot] = ptr; ptr += (64); } /* Assign first half of timeslots to Workbuffer1 */ ptr = hSbrDec->WorkBuffer1; for(; slotWorkBuffer2; for(; slotuseLP = useLP; if (useLP) { hSbrDec->SynthesisQMF.flags |= QMF_FLAG_LP; hSbrDec->AnalysiscQMF.flags |= QMF_FLAG_LP; } else { hSbrDec->SynthesisQMF.flags &= ~QMF_FLAG_LP; hSbrDec->AnalysiscQMF.flags &= ~QMF_FLAG_LP; } if (!useLP) assignHqTimeSlots( hSbrDec, hSbrDec->QmfBufferReal, hSbrDec->QmfBufferImag, noCols ); else { assignLcTimeSlots( hSbrDec, hSbrDec->QmfBufferReal, noCols ); } } static void changeQmfType( HANDLE_SBR_DEC hSbrDec, /*!< handle to Decoder channel */ int useLdTimeAlign ) { UINT synQmfFlags = hSbrDec->SynthesisQMF.flags; UINT anaQmfFlags = hSbrDec->AnalysiscQMF.flags; int resetSynQmf = 0; int resetAnaQmf = 0; /* assign qmf type */ if (useLdTimeAlign) { if (synQmfFlags & QMF_FLAG_CLDFB) { /* change the type to MPSLD */ synQmfFlags &= ~QMF_FLAG_CLDFB; synQmfFlags |= QMF_FLAG_MPSLDFB; resetSynQmf = 1; } if (anaQmfFlags & QMF_FLAG_CLDFB) { /* change the type to MPSLD */ anaQmfFlags &= ~QMF_FLAG_CLDFB; anaQmfFlags |= QMF_FLAG_MPSLDFB; resetAnaQmf = 1; } } else { if (synQmfFlags & QMF_FLAG_MPSLDFB) { /* change the type to CLDFB */ synQmfFlags &= ~QMF_FLAG_MPSLDFB; synQmfFlags |= QMF_FLAG_CLDFB; resetSynQmf = 1; } if (anaQmfFlags & QMF_FLAG_MPSLDFB) { /* change the type to CLDFB */ anaQmfFlags &= ~QMF_FLAG_MPSLDFB; anaQmfFlags |= QMF_FLAG_CLDFB; resetAnaQmf = 1; } } if (resetAnaQmf) { int qmfErr = qmfInitAnalysisFilterBank ( &hSbrDec->AnalysiscQMF, hSbrDec->anaQmfStates, hSbrDec->AnalysiscQMF.no_col, hSbrDec->AnalysiscQMF.lsb, hSbrDec->AnalysiscQMF.usb, hSbrDec->AnalysiscQMF.no_channels, anaQmfFlags | QMF_FLAG_KEEP_STATES ); if (qmfErr != 0) { FDK_ASSERT(0); } } if (resetSynQmf) { int qmfErr = qmfInitSynthesisFilterBank ( &hSbrDec->SynthesisQMF, hSbrDec->pSynQmfStates, hSbrDec->SynthesisQMF.no_col, hSbrDec->SynthesisQMF.lsb, hSbrDec->SynthesisQMF.usb, hSbrDec->SynthesisQMF.no_channels, synQmfFlags | QMF_FLAG_KEEP_STATES ); if (qmfErr != 0) { FDK_ASSERT(0); } } } /*! \brief SBR decoder core function for one channel \image html BufferMgmtDetailed-1632.png Besides the filter states of the QMF filter bank and the LPC-states of the LPP-Transposer, processing is mainly based on four buffers: #timeIn, #timeOut, #WorkBuffer2 and #OverlapBuffer. The #WorkBuffer2 is reused for all channels and might be used by the core decoder, a static overlap buffer is required for each channel. Du to in-place processing, #timeIn and #timeOut point to identical locations. The spectral data is organized in so-called slots, each slot containing 64 bands of complex data. The number of slots per frame is dependend on the frame size. For mp3PRO, there are 18 slots per frame and 6 slots per #OverlapBuffer. It is not necessary to have the slots in located consecutive address ranges. To optimize memory usage and to minimize the number of memory accesses, the memory management is organized as follows (Slot numbers based on mp3PRO): 1.) Input time domain signal is located in #timeIn, the last slots (0..5) of the spectral data of the previous frame are located in the #OverlapBuffer. In addition, #frameData of the current frame resides in the upper part of #timeIn. 2.) During the cplxAnalysisQmfFiltering(), 32 samples from #timeIn are transformed into a slot of up to 32 complex spectral low band values at a time. The first spectral slot -- nr. 6 -- is written at slot number zero of #WorkBuffer2. #WorkBuffer2 will be completely filled with spectral data. 3.) LPP-Transposition in lppTransposer() is processed on 24 slots. During the transposition, the high band part of the spectral data is replicated based on the low band data. Envelope Adjustment is processed on the high band part of the spectral data only by calculateSbrEnvelope(). 4.) The cplxSynthesisQmfFiltering() creates 64 time domain samples out of a slot of 64 complex spectral values at a time. The first 6 slots in #timeOut are filled from the results of spectral slots 0..5 in the #OverlapBuffer. The consecutive slots in timeOut are now filled with the results of spectral slots 6..17. 5.) The preprocessed slots 18..23 have to be stored in the #OverlapBuffer. */ void sbr_dec ( HANDLE_SBR_DEC hSbrDec, /*!< handle to Decoder channel */ INT_PCM *timeIn, /*!< pointer to input time signal */ INT_PCM *timeOut, /*!< pointer to output time signal */ HANDLE_SBR_DEC hSbrDecRight, /*!< handle to Decoder channel right */ INT_PCM *timeOutRight, /*!< pointer to output time signal */ const int strideIn, /*!< Time data traversal strideIn */ const int strideOut, /*!< Time data traversal strideOut */ HANDLE_SBR_HEADER_DATA hHeaderData,/*!< Static control data */ HANDLE_SBR_FRAME_DATA hFrameData, /*!< Control data of current frame */ HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData, /*!< Some control data of last frame */ const int applyProcessing, /*!< Flag for SBR operation */ HANDLE_PS_DEC h_ps_d, const UINT flags ) { int i, slot, reserve; int saveLbScale; int ov_len; int lastSlotOffs; FIXP_DBL maxVal; /* 1+1/3 frames of spectral data: */ FIXP_DBL **QmfBufferReal = hSbrDec->QmfBufferReal; FIXP_DBL **QmfBufferImag = hSbrDec->QmfBufferImag; /* Number of QMF timeslots in the overlap buffer: */ ov_len = hSbrDec->LppTrans.pSettings->overlap; /* Number of QMF slots per frame */ int noCols = hHeaderData->numberTimeSlots * hHeaderData->timeStep; /* assign qmf time slots */ if ( ((flags & SBRDEC_LOW_POWER ) ? 1 : 0) != ((hSbrDec->SynthesisQMF.flags & QMF_FLAG_LP) ? 1 : 0) ) { assignTimeSlots( hSbrDec, hHeaderData->numberTimeSlots * hHeaderData->timeStep, flags & SBRDEC_LOW_POWER); } if (flags & SBRDEC_ELD_GRID) { /* Choose the right low delay filter bank */ changeQmfType( hSbrDec, (flags & SBRDEC_LD_MPS_QMF) ? 1 : 0 ); } /* low band codec signal subband filtering */ { C_AALLOC_SCRATCH_START(qmfTemp, FIXP_DBL, 2*(64)); qmfAnalysisFiltering( &hSbrDec->AnalysiscQMF, QmfBufferReal + ov_len, QmfBufferImag + ov_len, &hSbrDec->sbrScaleFactor, timeIn, strideIn, qmfTemp ); C_AALLOC_SCRATCH_END(qmfTemp, FIXP_DBL, 2*(64)); } /* Clear upper half of spectrum */ { int nAnalysisBands = hHeaderData->numberOfAnalysisBands; if (! (flags & SBRDEC_LOW_POWER)) { for (slot = ov_len; slot < noCols+ov_len; slot++) { FDKmemclear(&QmfBufferReal[slot][nAnalysisBands],((64)-nAnalysisBands)*sizeof(FIXP_DBL)); FDKmemclear(&QmfBufferImag[slot][nAnalysisBands],((64)-nAnalysisBands)*sizeof(FIXP_DBL)); } } else for (slot = ov_len; slot < noCols+ov_len; slot++) { FDKmemclear(&QmfBufferReal[slot][nAnalysisBands],((64)-nAnalysisBands)*sizeof(FIXP_DBL)); } } /* Shift spectral data left to gain accuracy in transposer and adjustor */ maxVal = maxSubbandSample( QmfBufferReal, (flags & SBRDEC_LOW_POWER) ? NULL : QmfBufferImag, 0, hSbrDec->AnalysiscQMF.lsb, ov_len, noCols+ov_len ); reserve = fixMax(0,CntLeadingZeros(maxVal)-1) ; reserve = fixMin(reserve,DFRACT_BITS-1-hSbrDec->sbrScaleFactor.lb_scale); /* If all data is zero, lb_scale could become too large */ rescaleSubbandSamples( QmfBufferReal, (flags & SBRDEC_LOW_POWER) ? NULL : QmfBufferImag, 0, hSbrDec->AnalysiscQMF.lsb, ov_len, noCols+ov_len, reserve); hSbrDec->sbrScaleFactor.lb_scale += reserve; /* save low band scale, wavecoding or parametric stereo may modify it */ saveLbScale = hSbrDec->sbrScaleFactor.lb_scale; if (applyProcessing) { UCHAR * borders = hFrameData->frameInfo.borders; lastSlotOffs = borders[hFrameData->frameInfo.nEnvelopes] - hHeaderData->numberTimeSlots; FIXP_DBL degreeAlias[(64)]; /* The transposer will override most values in degreeAlias[]. The array needs to be cleared at least from lowSubband to highSubband before. */ if (flags & SBRDEC_LOW_POWER) FDKmemclear(°reeAlias[hHeaderData->freqBandData.lowSubband], (hHeaderData->freqBandData.highSubband-hHeaderData->freqBandData.lowSubband)*sizeof(FIXP_DBL)); /* Inverse filtering of lowband and transposition into the SBR-frequency range */ lppTransposer ( &hSbrDec->LppTrans, &hSbrDec->sbrScaleFactor, QmfBufferReal, degreeAlias, // only used if useLP = 1 QmfBufferImag, flags & SBRDEC_LOW_POWER, hHeaderData->timeStep, borders[0], lastSlotOffs, hHeaderData->freqBandData.nInvfBands, hFrameData->sbr_invf_mode, hPrevFrameData->sbr_invf_mode ); /* Adjust envelope of current frame. */ calculateSbrEnvelope (&hSbrDec->sbrScaleFactor, &hSbrDec->SbrCalculateEnvelope, hHeaderData, hFrameData, QmfBufferReal, QmfBufferImag, flags & SBRDEC_LOW_POWER, degreeAlias, flags, (hHeaderData->frameErrorFlag || hPrevFrameData->frameErrorFlag)); /* Update hPrevFrameData (to be used in the next frame) */ for (i=0; ifreqBandData.nInvfBands; i++) { hPrevFrameData->sbr_invf_mode[i] = hFrameData->sbr_invf_mode[i]; } hPrevFrameData->coupling = hFrameData->coupling; hPrevFrameData->stopPos = borders[hFrameData->frameInfo.nEnvelopes]; hPrevFrameData->ampRes = hFrameData->ampResolutionCurrentFrame; } else { /* Reset hb_scale if no highband is present, because hb_scale is considered in the QMF-synthesis */ hSbrDec->sbrScaleFactor.hb_scale = saveLbScale; } for (i=0; iLppTrans.lpcFilterStatesReal[i], QmfBufferReal[noCols-LPC_ORDER+i], hSbrDec->AnalysiscQMF.lsb*sizeof(FIXP_DBL)); FDKmemcpy(hSbrDec->LppTrans.lpcFilterStatesImag[i], QmfBufferImag[noCols-LPC_ORDER+i], hSbrDec->AnalysiscQMF.lsb*sizeof(FIXP_DBL)); } else FDKmemcpy(hSbrDec->LppTrans.lpcFilterStatesReal[i], QmfBufferReal[noCols-LPC_ORDER+i], hSbrDec->AnalysiscQMF.lsb*sizeof(FIXP_DBL)); } /* Synthesis subband filtering. */ if ( ! (flags & SBRDEC_PS_DECODED) ) { { int outScalefactor = 0; if (h_ps_d != NULL) { h_ps_d->procFrameBased = 1; /* we here do frame based processing */ } sbrDecoder_drcApply(&hSbrDec->sbrDrcChannel, QmfBufferReal, (flags & SBRDEC_LOW_POWER) ? NULL : QmfBufferImag, hSbrDec->SynthesisQMF.no_col, &outScalefactor ); qmfChangeOutScalefactor(&hSbrDec->SynthesisQMF, outScalefactor ); { C_AALLOC_SCRATCH_START(qmfTemp, FIXP_DBL, 2*(64)); qmfSynthesisFiltering( &hSbrDec->SynthesisQMF, QmfBufferReal, (flags & SBRDEC_LOW_POWER) ? NULL : QmfBufferImag, &hSbrDec->sbrScaleFactor, hSbrDec->LppTrans.pSettings->overlap, timeOut, strideOut, qmfTemp); C_AALLOC_SCRATCH_END(qmfTemp, FIXP_DBL, 2*(64)); } } } else { /* (flags & SBRDEC_PS_DECODED) */ INT i, sdiff, outScalefactor, scaleFactorLowBand, scaleFactorHighBand; SCHAR scaleFactorLowBand_ov, scaleFactorLowBand_no_ov; HANDLE_QMF_FILTER_BANK synQmf = &hSbrDec->SynthesisQMF; HANDLE_QMF_FILTER_BANK synQmfRight = &hSbrDecRight->SynthesisQMF; /* adapt scaling */ sdiff = hSbrDec->sbrScaleFactor.lb_scale - reserve; /* Scaling difference */ scaleFactorHighBand = sdiff - hSbrDec->sbrScaleFactor.hb_scale; /* Scale of current high band */ scaleFactorLowBand_ov = sdiff - hSbrDec->sbrScaleFactor.ov_lb_scale; /* Scale of low band overlapping QMF data */ scaleFactorLowBand_no_ov = sdiff - hSbrDec->sbrScaleFactor.lb_scale; /* Scale of low band current QMF data */ outScalefactor = 0; /* Initial output scale */ if (h_ps_d->procFrameBased == 1) /* If we have switched from frame to slot based processing copy filter states */ { /* procFrameBased will be unset later */ /* copy filter states from left to right */ FDKmemcpy(synQmfRight->FilterStates, synQmf->FilterStates, ((640)-(64))*sizeof(FIXP_QSS)); } /* scale ALL qmf vales ( real and imag ) of mono / left channel to the same scale factor ( ov_lb_sf, lb_sf and hq_sf ) */ scalFilterBankValues( h_ps_d, /* parametric stereo decoder handle */ QmfBufferReal, /* qmf filterbank values */ QmfBufferImag, /* qmf filterbank values */ synQmf->lsb, /* sbr start subband */ hSbrDec->sbrScaleFactor.ov_lb_scale, hSbrDec->sbrScaleFactor.lb_scale, &scaleFactorLowBand_ov, /* adapt scaling values */ &scaleFactorLowBand_no_ov, /* adapt scaling values */ hSbrDec->sbrScaleFactor.hb_scale, /* current frame ( highband ) */ &scaleFactorHighBand, synQmf->no_col); /* use the same synthese qmf values for left and right channel */ synQmfRight->no_col = synQmf->no_col; synQmfRight->lsb = synQmf->lsb; synQmfRight->usb = synQmf->usb; int env=0; outScalefactor += (SCAL_HEADROOM+1); /* psDiffScale! */ { C_ALLOC_SCRATCH_START(pWorkBuffer, FIXP_DBL, 2*(64)); int maxShift = 0; if (hSbrDec->sbrDrcChannel.prevFact_exp > maxShift) { maxShift = hSbrDec->sbrDrcChannel.prevFact_exp; } if (hSbrDec->sbrDrcChannel.currFact_exp > maxShift) { maxShift = hSbrDec->sbrDrcChannel.currFact_exp; } if (hSbrDec->sbrDrcChannel.nextFact_exp > maxShift) { maxShift = hSbrDec->sbrDrcChannel.nextFact_exp; } /* copy DRC data to right channel (with PS both channels use the same DRC gains) */ FDKmemcpy(&hSbrDecRight->sbrDrcChannel, &hSbrDec->sbrDrcChannel, sizeof(SBRDEC_DRC_CHANNEL)); for (i = 0; i < synQmf->no_col; i++) { /* ----- no_col loop ----- */ INT outScalefactorR, outScalefactorL; outScalefactorR = outScalefactorL = outScalefactor; /* qmf timeslot of right channel */ FIXP_DBL* rQmfReal = pWorkBuffer; FIXP_DBL* rQmfImag = pWorkBuffer + 64; { if ( i == h_ps_d->bsData[h_ps_d->processSlot].mpeg.aEnvStartStop[env] ) { initSlotBasedRotation( h_ps_d, env, hHeaderData->freqBandData.highSubband ); env++; } ApplyPsSlot( h_ps_d, /* parametric stereo decoder handle */ (QmfBufferReal + i), /* one timeslot of left/mono channel */ (QmfBufferImag + i), /* one timeslot of left/mono channel */ rQmfReal, /* one timeslot or right channel */ rQmfImag); /* one timeslot or right channel */ } scaleFactorLowBand = (i<(6)) ? scaleFactorLowBand_ov : scaleFactorLowBand_no_ov; sbrDecoder_drcApplySlot ( /* right channel */ &hSbrDecRight->sbrDrcChannel, rQmfReal, rQmfImag, i, synQmfRight->no_col, maxShift ); outScalefactorR += maxShift; sbrDecoder_drcApplySlot ( /* left channel */ &hSbrDec->sbrDrcChannel, *(QmfBufferReal + i), *(QmfBufferImag + i), i, synQmf->no_col, maxShift ); outScalefactorL += maxShift; /* scale filter states for left and right channel */ qmfChangeOutScalefactor( synQmf, outScalefactorL ); qmfChangeOutScalefactor( synQmfRight, outScalefactorR ); { qmfSynthesisFilteringSlot( synQmfRight, rQmfReal, /* QMF real buffer */ rQmfImag, /* QMF imag buffer */ scaleFactorLowBand, scaleFactorHighBand, timeOutRight+(i*synQmf->no_channels*strideOut), strideOut, pWorkBuffer); qmfSynthesisFilteringSlot( synQmf, *(QmfBufferReal + i), /* QMF real buffer */ *(QmfBufferImag + i), /* QMF imag buffer */ scaleFactorLowBand, scaleFactorHighBand, timeOut+(i*synQmf->no_channels*strideOut), strideOut, pWorkBuffer); } } /* no_col loop i */ /* scale back (6) timeslots look ahead for hybrid filterbank to original value */ rescalFilterBankValues( h_ps_d, QmfBufferReal, QmfBufferImag, synQmf->lsb, synQmf->no_col ); C_ALLOC_SCRATCH_END(pWorkBuffer, FIXP_DBL, 2*(64)); } } sbrDecoder_drcUpdateChannel( &hSbrDec->sbrDrcChannel ); /* Update overlap buffer Even bands above usb are copied to avoid outdated spectral data in case the stop frequency raises. */ if (hSbrDec->LppTrans.pSettings->overlap > 0) { if (! (flags & SBRDEC_LOW_POWER)) { for ( i=0; iLppTrans.pSettings->overlap; i++ ) { FDKmemcpy(QmfBufferReal[i], QmfBufferReal[i+noCols], (64)*sizeof(FIXP_DBL)); FDKmemcpy(QmfBufferImag[i], QmfBufferImag[i+noCols], (64)*sizeof(FIXP_DBL)); } } else for ( i=0; iLppTrans.pSettings->overlap; i++ ) { FDKmemcpy(QmfBufferReal[i], QmfBufferReal[i+noCols], (64)*sizeof(FIXP_DBL)); } } hSbrDec->sbrScaleFactor.ov_lb_scale = saveLbScale; /* Save current frame status */ hPrevFrameData->frameErrorFlag = hHeaderData->frameErrorFlag; } // sbr_dec() /*! \brief Creates sbr decoder structure \return errorCode, 0 if successful */ SBR_ERROR createSbrDec (SBR_CHANNEL * hSbrChannel, HANDLE_SBR_HEADER_DATA hHeaderData, /*!< Static control data */ TRANSPOSER_SETTINGS *pSettings, const int downsampleFac, /*!< Downsampling factor */ const UINT qmfFlags, /*!< flags -> 1: HQ/LP selector, 2: CLDFB */ const UINT flags, const int overlap, int chan) /*!< Channel for which to assign buffers etc. */ { SBR_ERROR err = SBRDEC_OK; int timeSlots = hHeaderData->numberTimeSlots; /* Number of SBR slots per frame */ int noCols = timeSlots * hHeaderData->timeStep; /* Number of QMF slots per frame */ HANDLE_SBR_DEC hs = &(hSbrChannel->SbrDec); /* Initialize scale factors */ hs->sbrScaleFactor.ov_lb_scale = 0; hs->sbrScaleFactor.ov_hb_scale = 0; hs->sbrScaleFactor.hb_scale = 0; /* create envelope calculator */ err = createSbrEnvelopeCalc (&hs->SbrCalculateEnvelope, hHeaderData, chan, flags); if (err != SBRDEC_OK) { return err; } /* create QMF filter banks */ { int qmfErr; qmfErr = qmfInitAnalysisFilterBank ( &hs->AnalysiscQMF, hs->anaQmfStates, noCols, hHeaderData->freqBandData.lowSubband, hHeaderData->freqBandData.highSubband, hHeaderData->numberOfAnalysisBands, qmfFlags & (~QMF_FLAG_KEEP_STATES) ); if (qmfErr != 0) { return SBRDEC_UNSUPPORTED_CONFIG; } } if (hs->pSynQmfStates == NULL) { hs->pSynQmfStates = GetRam_sbr_QmfStatesSynthesis(chan); if (hs->pSynQmfStates == NULL) return SBRDEC_MEM_ALLOC_FAILED; } { int qmfErr; qmfErr = qmfInitSynthesisFilterBank ( &hs->SynthesisQMF, hs->pSynQmfStates, noCols, hHeaderData->freqBandData.lowSubband, hHeaderData->freqBandData.highSubband, (64) / downsampleFac, qmfFlags & (~QMF_FLAG_KEEP_STATES) ); if (qmfErr != 0) { return SBRDEC_UNSUPPORTED_CONFIG; } } initSbrPrevFrameData (&hSbrChannel->prevFrameData, timeSlots); /* create transposer */ err = createLppTransposer (&hs->LppTrans, pSettings, hHeaderData->freqBandData.lowSubband, hHeaderData->freqBandData.v_k_master, hHeaderData->freqBandData.numMaster, hs->SynthesisQMF.usb, timeSlots, hs->AnalysiscQMF.no_col, hHeaderData->freqBandData.freqBandTableNoise, hHeaderData->freqBandData.nNfb, hHeaderData->sbrProcSmplRate, chan, overlap ); if (err != SBRDEC_OK) { return err; } /* The CLDFB does not have overlap */ if ((qmfFlags & QMF_FLAG_CLDFB) == 0) { if (hs->pSbrOverlapBuffer == NULL) { hs->pSbrOverlapBuffer = GetRam_sbr_OverlapBuffer(chan); if (hs->pSbrOverlapBuffer == NULL) { return SBRDEC_MEM_ALLOC_FAILED; } } else { /* Clear overlap buffer */ FDKmemclear( hs->pSbrOverlapBuffer, sizeof(FIXP_DBL) * 2 * (6) * (64) ); } } /* assign qmf time slots */ assignTimeSlots( &hSbrChannel->SbrDec, hHeaderData->numberTimeSlots * hHeaderData->timeStep, qmfFlags & QMF_FLAG_LP); return err; } /*! \brief Delete sbr decoder structure \return errorCode, 0 if successful */ int deleteSbrDec (SBR_CHANNEL * hSbrChannel) { HANDLE_SBR_DEC hs = &hSbrChannel->SbrDec; deleteSbrEnvelopeCalc (&hs->SbrCalculateEnvelope); /* delete QMF filter states */ if (hs->pSynQmfStates != NULL) { FreeRam_sbr_QmfStatesSynthesis(&hs->pSynQmfStates); } if (hs->pSbrOverlapBuffer != NULL) { FreeRam_sbr_OverlapBuffer(&hs->pSbrOverlapBuffer); } return 0; } /*! \brief resets sbr decoder structure \return errorCode, 0 if successful */ SBR_ERROR resetSbrDec (HANDLE_SBR_DEC hSbrDec, HANDLE_SBR_HEADER_DATA hHeaderData, HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData, const int useLP, const int downsampleFac ) { SBR_ERROR sbrError = SBRDEC_OK; int old_lsb = hSbrDec->SynthesisQMF.lsb; int new_lsb = hHeaderData->freqBandData.lowSubband; int l, startBand, stopBand, startSlot, size; int source_scale, target_scale, delta_scale, target_lsb, target_usb, reserve; FIXP_DBL maxVal; /* overlapBuffer point to first (6) slots */ FIXP_DBL **OverlapBufferReal = hSbrDec->QmfBufferReal; FIXP_DBL **OverlapBufferImag = hSbrDec->QmfBufferImag; /* assign qmf time slots */ assignTimeSlots( hSbrDec, hHeaderData->numberTimeSlots * hHeaderData->timeStep, useLP); resetSbrEnvelopeCalc (&hSbrDec->SbrCalculateEnvelope); hSbrDec->SynthesisQMF.lsb = hHeaderData->freqBandData.lowSubband; hSbrDec->SynthesisQMF.usb = fixMin((INT)hSbrDec->SynthesisQMF.no_channels, (INT)hHeaderData->freqBandData.highSubband); hSbrDec->AnalysiscQMF.lsb = hSbrDec->SynthesisQMF.lsb; hSbrDec->AnalysiscQMF.usb = hSbrDec->SynthesisQMF.usb; /* The following initialization of spectral data in the overlap buffer is required for dynamic x-over or a change of the start-freq for 2 reasons: 1. If the lowband gets _wider_, unadjusted data would remain 2. If the lowband becomes _smaller_, the highest bands of the old lowband must be cleared because the whitening would be affected */ startBand = old_lsb; stopBand = new_lsb; startSlot = hHeaderData->timeStep * (hPrevFrameData->stopPos - hHeaderData->numberTimeSlots); size = fixMax(0,stopBand-startBand); /* keep already adjusted data in the x-over-area */ if (!useLP) { for (l=startSlot; lLppTrans.pSettings->overlap; l++) { FDKmemclear(&OverlapBufferReal[l][startBand], size*sizeof(FIXP_DBL)); FDKmemclear(&OverlapBufferImag[l][startBand], size*sizeof(FIXP_DBL)); } } else for (l=startSlot; lLppTrans.pSettings->overlap ; l++) { FDKmemclear(&OverlapBufferReal[l][startBand], size*sizeof(FIXP_DBL)); } /* reset LPC filter states */ startBand = fixMin(old_lsb,new_lsb); stopBand = fixMax(old_lsb,new_lsb); size = fixMax(0,stopBand-startBand); FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesReal[0][startBand], size*sizeof(FIXP_DBL)); FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesReal[1][startBand], size*sizeof(FIXP_DBL)); if (!useLP) { FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesImag[0][startBand], size*sizeof(FIXP_DBL)); FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesImag[1][startBand], size*sizeof(FIXP_DBL)); } /* Rescale already processed spectral data between old and new x-over frequency. This must be done because of the separate scalefactors for lowband and highband. */ startBand = fixMin(old_lsb,new_lsb); stopBand = fixMax(old_lsb,new_lsb); if (new_lsb > old_lsb) { /* The x-over-area was part of the highband before and will now belong to the lowband */ source_scale = hSbrDec->sbrScaleFactor.ov_hb_scale; target_scale = hSbrDec->sbrScaleFactor.ov_lb_scale; target_lsb = 0; target_usb = old_lsb; } else { /* The x-over-area was part of the lowband before and will now belong to the highband */ source_scale = hSbrDec->sbrScaleFactor.ov_lb_scale; target_scale = hSbrDec->sbrScaleFactor.ov_hb_scale; /* jdr: The values old_lsb and old_usb might be wrong because the previous frame might have been "upsamling". */ target_lsb = hSbrDec->SynthesisQMF.lsb; target_usb = hSbrDec->SynthesisQMF.usb; } /* Shift left all samples of the x-over-area as much as possible An unnecessary coarse scale could cause ov_lb_scale or ov_hb_scale to be adapted and the accuracy in the next frame would seriously suffer! */ maxVal = maxSubbandSample( OverlapBufferReal, (useLP) ? NULL : OverlapBufferImag, startBand, stopBand, 0, startSlot); reserve = CntLeadingZeros(maxVal)-1; reserve = fixMin(reserve,DFRACT_BITS-1-source_scale); rescaleSubbandSamples( OverlapBufferReal, (useLP) ? NULL : OverlapBufferImag, startBand, stopBand, 0, startSlot, reserve); source_scale += reserve; delta_scale = target_scale - source_scale; if (delta_scale > 0) { /* x-over-area is dominant */ delta_scale = -delta_scale; startBand = target_lsb; stopBand = target_usb; if (new_lsb > old_lsb) { /* The lowband has to be rescaled */ hSbrDec->sbrScaleFactor.ov_lb_scale = source_scale; } else { /* The highband has be be rescaled */ hSbrDec->sbrScaleFactor.ov_hb_scale = source_scale; } } FDK_ASSERT(startBand <= stopBand); if (!useLP) { for (l=0; lLppTrans, hHeaderData->freqBandData.lowSubband, hHeaderData->freqBandData.v_k_master, hHeaderData->freqBandData.numMaster, hHeaderData->freqBandData.freqBandTableNoise, hHeaderData->freqBandData.nNfb, hHeaderData->freqBandData.highSubband, hHeaderData->sbrProcSmplRate); if (sbrError != SBRDEC_OK) return sbrError; sbrError = ResetLimiterBands ( hHeaderData->freqBandData.limiterBandTable, &hHeaderData->freqBandData.noLimiterBands, hHeaderData->freqBandData.freqBandTable[0], hHeaderData->freqBandData.nSfb[0], hSbrDec->LppTrans.pSettings->patchParam, hSbrDec->LppTrans.pSettings->noOfPatches, hHeaderData->bs_data.limiterBands); return sbrError; }