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Diffstat (limited to 'fdk-aac/libAACdec/src/aacdec_tns.cpp')
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diff --git a/fdk-aac/libAACdec/src/aacdec_tns.cpp b/fdk-aac/libAACdec/src/aacdec_tns.cpp new file mode 100644 index 0000000..fb3fe33 --- /dev/null +++ b/fdk-aac/libAACdec/src/aacdec_tns.cpp @@ -0,0 +1,361 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2018 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 +----------------------------------------------------------------------------- */ + +/**************************** AAC decoder library ****************************** + + Author(s): Josef Hoepfl + + Description: temporal noise shaping tool + +*******************************************************************************/ + +#include "aacdec_tns.h" +#include "aac_rom.h" +#include "FDK_bitstream.h" +#include "channelinfo.h" + +#include "FDK_lpc.h" + +#define TNS_MAXIMUM_ORDER_AAC 12 + +/*! + \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; + UCHAR isLongFlag; + UCHAR start_window; + AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK; + + if (!pTnsData->DataPresent) { + return ErrorStatus; + } + + { + start_window = 0; + wins_per_frame = GetWindowsPerFrame(pIcsInfo); + isLongFlag = IsLongBlock(pIcsInfo); + } + + pTnsData->GainLd = 0; + + for (window = start_window; window < wins_per_frame; window++) { + pTnsData->NumberOfFilters[window] = n_filt = + (UCHAR)FDKreadBits(bs, isLongFlag ? 2 : 1); + + 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; + + if (flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA)) { + /* max(Order) = 15 (long), 7 (short) */ + filter->Order = order = (UCHAR)FDKreadBits(bs, isLongFlag ? 4 : 3); + } else { + filter->Order = order = (UCHAR)FDKreadBits(bs, isLongFlag ? 5 : 3); + + if (filter->Order > TNS_MAXIMUM_ORDER) { + ErrorStatus = AAC_DEC_TNS_READ_ERROR; + return ErrorStatus; + } + } + + FDK_ASSERT(order <= + TNS_MAXIMUM_ORDER); /* avoid illegal memory access */ + 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->GainLd = 4; + } + } + } + } + + pTnsData->Active = 1; + + return ErrorStatus; +} + +void CTns_ReadDataPresentUsac(HANDLE_FDK_BITSTREAM hBs, CTnsData *pTnsData0, + CTnsData *pTnsData1, UCHAR *ptns_on_lr, + const CIcsInfo *pIcsInfo, const UINT flags, + const UINT elFlags, const int fCommonWindow) { + int common_tns = 0; + + if (fCommonWindow) { + common_tns = FDKreadBit(hBs); + } + { *ptns_on_lr = FDKreadBit(hBs); } + if (common_tns) { + pTnsData0->DataPresent = 1; + CTns_Read(hBs, pTnsData0, pIcsInfo, flags); + + pTnsData0->DataPresent = 0; + pTnsData0->Active = 1; + *pTnsData1 = *pTnsData0; + } else { + int tns_present_both; + + tns_present_both = FDKreadBit(hBs); + if (tns_present_both) { + pTnsData0->DataPresent = 1; + pTnsData1->DataPresent = 1; + } else { + pTnsData1->DataPresent = FDKreadBit(hBs); + pTnsData0->DataPresent = !pTnsData1->DataPresent; + } + } +} + +/*! + \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, const UCHAR nbands, + const UCHAR igf_active, const UINT flags) { + int window, index, start, stop, size, start_window, wins_per_frame; + + if (pTnsData->Active) { + C_AALLOC_SCRATCH_START(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER) + + { + start_window = 0; + wins_per_frame = GetWindowsPerFrame(pIcsInfo); + } + + for (window = start_window; window < wins_per_frame; window++) { + FIXP_DBL *pSpectrum; + + { pSpectrum = SPEC(pSpectralCoefficient, window, granuleLength); } + + for (index = 0; index < pTnsData->NumberOfFilters[window]; index++) { + CFilter *filter = &pTnsData->Filter[window][index]; + + if (filter->Order > 0) { + FIXP_TCC *pCoeff; + UCHAR tns_max_bands; + + pCoeff = coeff; + 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); + /* See redefinition of TNS_MAX_BANDS table */ + if ((flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA)) && + (pSamplingRateInfo->samplingRateIndex > 5)) { + tns_max_bands += 1; + } + break; + } + + start = fixMin(fixMin(filter->StartBand, tns_max_bands), nbands); + + start = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[start]; + + if (igf_active) { + stop = fixMin(filter->StopBand, nbands); + } else { + stop = fixMin(fixMin(filter->StopBand, tns_max_bands), nbands); + } + + stop = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[stop]; + + size = stop - start; + + if (size) { + C_ALLOC_SCRATCH_START(state, FIXP_DBL, TNS_MAXIMUM_ORDER) + + FDKmemclear(state, TNS_MAXIMUM_ORDER * sizeof(FIXP_DBL)); + CLpc_SynthesisLattice(pSpectrum + start, size, 0, 0, + filter->Direction, coeff, filter->Order, + state); + + C_ALLOC_SCRATCH_END(state, FIXP_DBL, TNS_MAXIMUM_ORDER) + } + } + } + } + C_AALLOC_SCRATCH_END(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER) + } +} |