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Diffstat (limited to 'libAACdec/src/aacdec_tns.cpp')
| -rw-r--r-- | libAACdec/src/aacdec_tns.cpp | 412 |
1 files changed, 0 insertions, 412 deletions
diff --git a/libAACdec/src/aacdec_tns.cpp b/libAACdec/src/aacdec_tns.cpp deleted file mode 100644 index 352f04a..0000000 --- a/libAACdec/src/aacdec_tns.cpp +++ /dev/null @@ -1,412 +0,0 @@ - -/* ----------------------------------------------------------------------------------------------------------- -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 ------------------------------------------------------------------------------------------------------------ */ - -/***************************** MPEG-4 AAC Decoder ************************** - - Author(s): Josef Hoepfl - Description: temporal noise shaping tool - -******************************************************************************/ - -#include "aacdec_tns.h" -#include "aac_rom.h" -#include "FDK_bitstream.h" -#include "channelinfo.h" - - - -/*! - \brief Reset tns data - - The function resets the tns data - - \return none -*/ -void CTns_Reset(CTnsData *pTnsData) -{ - /* Note: the following FDKmemclear should not be required. */ - FDKmemclear(pTnsData->Filter, TNS_MAX_WINDOWS*TNS_MAXIMUM_FILTERS*sizeof(CFilter)); - FDKmemclear(pTnsData->NumberOfFilters, TNS_MAX_WINDOWS*sizeof(UCHAR)); - pTnsData->DataPresent = 0; - pTnsData->Active = 0; -} - -void CTns_ReadDataPresentFlag(HANDLE_FDK_BITSTREAM bs, /*!< pointer to bitstream */ - CTnsData *pTnsData) /*!< pointer to aac decoder channel info */ -{ - pTnsData->DataPresent = (UCHAR) FDKreadBits(bs,1); -} - -/*! - \brief Read tns data from bitstream - - The function reads the elements for tns from - the bitstream. - - \return none -*/ -AAC_DECODER_ERROR CTns_Read(HANDLE_FDK_BITSTREAM bs, - CTnsData *pTnsData, - const CIcsInfo *pIcsInfo, - const UINT flags) -{ - UCHAR n_filt,order; - UCHAR length,coef_res,coef_compress; - UCHAR window; - UCHAR wins_per_frame = GetWindowsPerFrame(pIcsInfo); - UCHAR isLongFlag = IsLongBlock(pIcsInfo); - AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK; - - if (!pTnsData->DataPresent) { - return ErrorStatus; - } - - for (window = 0; window < wins_per_frame; window++) - { - pTnsData->NumberOfFilters[window] = n_filt = (UCHAR) FDKreadBits(bs, isLongFlag ? 2 : 1); - - if (pTnsData->NumberOfFilters[window] > TNS_MAXIMUM_FILTERS){ - pTnsData->NumberOfFilters[window] = n_filt = TNS_MAXIMUM_FILTERS; - } - - if (n_filt) - { - int index; - UCHAR nextstopband; - - coef_res = (UCHAR) FDKreadBits(bs,1); - - nextstopband = GetScaleFactorBandsTotal(pIcsInfo); - - for (index=0; index < n_filt; index++) - { - CFilter *filter = &pTnsData->Filter[window][index]; - - length = (UCHAR)FDKreadBits(bs, isLongFlag ? 6 : 4); - - if (length > nextstopband){ - length = nextstopband; - } - - filter->StartBand = nextstopband - length; - filter->StopBand = nextstopband; - nextstopband = filter->StartBand; - - { - filter->Order = order = (UCHAR) FDKreadBits(bs, isLongFlag ? 5 : 3); - } - - if (filter->Order > TNS_MAXIMUM_ORDER){ - filter->Order = order = TNS_MAXIMUM_ORDER; - } - - if (order) - { - UCHAR coef,s_mask; - UCHAR i; - SCHAR n_mask; - static const UCHAR sgn_mask[] = { 0x2, 0x4, 0x8 }; - static const SCHAR neg_mask[] = { ~0x3, ~0x7, ~0xF }; - - filter->Direction = FDKreadBits(bs,1) ? -1 : 1; - - coef_compress = (UCHAR) FDKreadBits(bs,1); - - filter->Resolution = coef_res + 3; - - s_mask = sgn_mask[coef_res + 1 - coef_compress]; - n_mask = neg_mask[coef_res + 1 - coef_compress]; - - for (i=0; i < order; i++) - { - coef = (UCHAR) FDKreadBits(bs,filter->Resolution - coef_compress); - filter->Coeff[i] = (coef & s_mask) ? (coef | n_mask) : coef; - } - } - } - } - } - - pTnsData->Active = 1; - - return ErrorStatus; -} - - -static void CTns_Filter (FIXP_DBL *spec, int size, int inc, FIXP_TCC coeff [], int order) -{ - // - Simple all-pole filter of order "order" defined by - // y(n) = x(n) - a(2)*y(n-1) - ... - a(order+1)*y(n-order) - // - // - The state variables of the filter are initialized to zero every time - // - // - The output data is written over the input data ("in-place operation") - // - // - An input vector of "size" samples is processed and the index increment - // to the next data sample is given by "inc" - - int i,j,N; - FIXP_DBL *pSpec; - FIXP_DBL maxVal=FL2FXCONST_DBL(0.0); - INT s; - - FDK_ASSERT(order <= TNS_MAXIMUM_ORDER); - C_ALLOC_SCRATCH_START(state, FIXP_DBL, TNS_MAXIMUM_ORDER); - FDKmemclear(state, order*sizeof(FIXP_DBL)); - - for (i=0; i<size; i++) { - maxVal = fixMax(maxVal,fixp_abs(spec[i])); - } - - if ( maxVal > FL2FXCONST_DBL(0.03125*0.70710678118) ) - s = fixMax(CntLeadingZeros(maxVal)-6,0); - else - s = fixMax(CntLeadingZeros(maxVal)-5,0); - - s = fixMin(s,2); - s = s-1; - - if (inc == -1) - pSpec = &spec[size - 1]; - else - pSpec = &spec[0]; - - FIXP_TCC *pCoeff; - -#define FIRST_PART_FLTR \ - FIXP_DBL x, *pState = state; \ - pCoeff = coeff; \ - \ - if (s < 0) \ - x = (pSpec [0]>>1) + fMultDiv2 (*pCoeff++, pState [0]) ; \ - else \ - x = (pSpec [0]<<s) + fMultDiv2 (*pCoeff++, pState [0]) ; - -#define INNER_FLTR_INLINE \ - x = fMultAddDiv2 (x, *pCoeff, pState [1]); \ - pState [0] = pState [1] - (fMultDiv2 (*pCoeff++, x) <<2) ; \ - pState++; - -#define LAST_PART_FLTR \ - if (s < 0) \ - *pSpec = x << 1; \ - else \ - *pSpec = x >> s; \ - *pState =(-x) << 1; \ - pSpec += inc ; - - - if (order>8) - { - N = (order-1)&7; - - for (i = size ; i != 0 ; i--) - { - FIRST_PART_FLTR - - for (j = N; j > 0 ; j--) { INNER_FLTR_INLINE } - - INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE - INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE - - LAST_PART_FLTR - } - - } else if (order>4) { - - N = (order-1)&3; - - for (i = size ; i != 0 ; i--) - { - FIRST_PART_FLTR - for (j = N; j > 0 ; j--) { INNER_FLTR_INLINE } - - INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE - - LAST_PART_FLTR - } - - } else { - - N = order-1; - - for (i = size ; i != 0 ; i--) - { - FIRST_PART_FLTR - - for (j = N; j > 0 ; j--) { INNER_FLTR_INLINE } - - LAST_PART_FLTR - } - } - - C_ALLOC_SCRATCH_END(state, FIXP_DBL, TNS_MAXIMUM_ORDER); -} - -/*! - \brief Apply tns to spectral lines - - The function applies the tns to the spectrum, - - \return none -*/ -void CTns_Apply ( - CTnsData *RESTRICT pTnsData, /*!< pointer to aac decoder info */ - const CIcsInfo *pIcsInfo, - SPECTRAL_PTR pSpectralCoefficient, - const SamplingRateInfo *pSamplingRateInfo, - const INT granuleLength - ) -{ - int window,index,start,stop,size; - - - if (pTnsData->Active) - { - C_AALLOC_SCRATCH_START(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER); - - for (window=0; window < GetWindowsPerFrame(pIcsInfo); window++) - { - FIXP_DBL *pSpectrum = SPEC(pSpectralCoefficient, window, granuleLength); - - for (index=0; index < pTnsData->NumberOfFilters[window]; index++) - { - CFilter *RESTRICT filter = &pTnsData->Filter[window][index]; - - if (filter->Order > 0) - { - FIXP_TCC *pCoeff; - int tns_max_bands; - - pCoeff = &coeff[filter->Order-1]; - if (filter->Resolution == 3) - { - int i; - for (i=0; i < filter->Order; i++) - *pCoeff-- = FDKaacDec_tnsCoeff3[filter->Coeff[i]+4]; - } - else - { - int i; - for (i=0; i < filter->Order; i++) - *pCoeff-- = FDKaacDec_tnsCoeff4[filter->Coeff[i]+8]; - } - - switch (granuleLength) { - case 480: - tns_max_bands = tns_max_bands_tbl_480[pSamplingRateInfo->samplingRateIndex]; - break; - case 512: - tns_max_bands = tns_max_bands_tbl_512[pSamplingRateInfo->samplingRateIndex]; - break; - default: - tns_max_bands = GetMaximumTnsBands(pIcsInfo, pSamplingRateInfo->samplingRateIndex); - break; - } - - start = fixMin( fixMin(filter->StartBand, tns_max_bands), - GetScaleFactorBandsTransmitted(pIcsInfo) ); - - start = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[start]; - - stop = fixMin( fixMin(filter->StopBand, tns_max_bands), - GetScaleFactorBandsTransmitted(pIcsInfo) ); - - stop = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[stop]; - - size = stop - start; - - if (size > 0) { - CTns_Filter(&pSpectrum[start], - size, - filter->Direction, - coeff, - filter->Order ); - } - } - } - } - C_AALLOC_SCRATCH_END(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER); - } - -} |