/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/**************************** AAC decoder library ******************************
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Author(s): Josef Hoepfl
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Description: temporal noise shaping tool
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*******************************************************************************/
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#include "aacdec_tns.h"
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#include "aac_rom.h"
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#include "FDK_bitstream.h"
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#include "channelinfo.h"
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#include "FDK_lpc.h"
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#define TNS_MAXIMUM_ORDER_AAC 12
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/*!
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\brief Reset tns data
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The function resets the tns data
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\return none
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*/
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void CTns_Reset(CTnsData *pTnsData) {
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/* Note: the following FDKmemclear should not be required. */
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FDKmemclear(pTnsData->Filter,
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TNS_MAX_WINDOWS * TNS_MAXIMUM_FILTERS * sizeof(CFilter));
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FDKmemclear(pTnsData->NumberOfFilters, TNS_MAX_WINDOWS * sizeof(UCHAR));
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pTnsData->DataPresent = 0;
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pTnsData->Active = 0;
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}
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void CTns_ReadDataPresentFlag(
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HANDLE_FDK_BITSTREAM bs, /*!< pointer to bitstream */
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CTnsData *pTnsData) /*!< pointer to aac decoder channel info */
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{
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pTnsData->DataPresent = (UCHAR)FDKreadBits(bs, 1);
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}
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/*!
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\brief Read tns data from bitstream
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The function reads the elements for tns from
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the bitstream.
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\return none
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*/
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AAC_DECODER_ERROR CTns_Read(HANDLE_FDK_BITSTREAM bs, CTnsData *pTnsData,
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const CIcsInfo *pIcsInfo, const UINT flags) {
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UCHAR n_filt, order;
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UCHAR length, coef_res, coef_compress;
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UCHAR window;
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UCHAR wins_per_frame;
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UCHAR isLongFlag;
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UCHAR start_window;
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AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
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if (!pTnsData->DataPresent) {
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return ErrorStatus;
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}
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{
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start_window = 0;
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wins_per_frame = GetWindowsPerFrame(pIcsInfo);
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isLongFlag = IsLongBlock(pIcsInfo);
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}
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pTnsData->GainLd = 0;
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for (window = start_window; window < wins_per_frame; window++) {
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pTnsData->NumberOfFilters[window] = n_filt =
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(UCHAR)FDKreadBits(bs, isLongFlag ? 2 : 1);
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if (n_filt) {
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int index;
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UCHAR nextstopband;
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coef_res = (UCHAR)FDKreadBits(bs, 1);
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nextstopband = GetScaleFactorBandsTotal(pIcsInfo);
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for (index = 0; index < n_filt; index++) {
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CFilter *filter = &pTnsData->Filter[window][index];
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length = (UCHAR)FDKreadBits(bs, isLongFlag ? 6 : 4);
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if (length > nextstopband) {
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length = nextstopband;
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}
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filter->StartBand = nextstopband - length;
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filter->StopBand = nextstopband;
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nextstopband = filter->StartBand;
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if (flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA)) {
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/* max(Order) = 15 (long), 7 (short) */
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filter->Order = order = (UCHAR)FDKreadBits(bs, isLongFlag ? 4 : 3);
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} else {
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filter->Order = order = (UCHAR)FDKreadBits(bs, isLongFlag ? 5 : 3);
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if (filter->Order > TNS_MAXIMUM_ORDER) {
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ErrorStatus = AAC_DEC_TNS_READ_ERROR;
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return ErrorStatus;
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}
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}
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FDK_ASSERT(order <=
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TNS_MAXIMUM_ORDER); /* avoid illegal memory access */
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if (order) {
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UCHAR coef, s_mask;
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UCHAR i;
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SCHAR n_mask;
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static const UCHAR sgn_mask[] = {0x2, 0x4, 0x8};
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static const SCHAR neg_mask[] = {~0x3, ~0x7, ~0xF};
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filter->Direction = FDKreadBits(bs, 1) ? -1 : 1;
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coef_compress = (UCHAR)FDKreadBits(bs, 1);
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filter->Resolution = coef_res + 3;
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s_mask = sgn_mask[coef_res + 1 - coef_compress];
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n_mask = neg_mask[coef_res + 1 - coef_compress];
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for (i = 0; i < order; i++) {
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coef = (UCHAR)FDKreadBits(bs, filter->Resolution - coef_compress);
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filter->Coeff[i] = (coef & s_mask) ? (coef | n_mask) : coef;
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}
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pTnsData->GainLd = 4;
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}
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}
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}
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}
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pTnsData->Active = 1;
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return ErrorStatus;
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}
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void CTns_ReadDataPresentUsac(HANDLE_FDK_BITSTREAM hBs, CTnsData *pTnsData0,
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CTnsData *pTnsData1, UCHAR *ptns_on_lr,
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const CIcsInfo *pIcsInfo, const UINT flags,
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const UINT elFlags, const int fCommonWindow) {
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int common_tns = 0;
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if (fCommonWindow) {
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common_tns = FDKreadBit(hBs);
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}
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{ *ptns_on_lr = FDKreadBit(hBs); }
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if (common_tns) {
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pTnsData0->DataPresent = 1;
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CTns_Read(hBs, pTnsData0, pIcsInfo, flags);
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pTnsData0->DataPresent = 0;
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pTnsData0->Active = 1;
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*pTnsData1 = *pTnsData0;
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} else {
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int tns_present_both;
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tns_present_both = FDKreadBit(hBs);
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if (tns_present_both) {
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pTnsData0->DataPresent = 1;
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pTnsData1->DataPresent = 1;
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} else {
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pTnsData1->DataPresent = FDKreadBit(hBs);
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pTnsData0->DataPresent = !pTnsData1->DataPresent;
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}
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}
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}
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/*!
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\brief Apply tns to spectral lines
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The function applies the tns to the spectrum,
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\return none
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*/
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void CTns_Apply(CTnsData *RESTRICT pTnsData, /*!< pointer to aac decoder info */
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const CIcsInfo *pIcsInfo, SPECTRAL_PTR pSpectralCoefficient,
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const SamplingRateInfo *pSamplingRateInfo,
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const INT granuleLength, const UCHAR nbands,
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const UCHAR igf_active, const UINT flags) {
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int window, index, start, stop, size, start_window, wins_per_frame;
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if (pTnsData->Active) {
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C_AALLOC_SCRATCH_START(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER)
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{
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start_window = 0;
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wins_per_frame = GetWindowsPerFrame(pIcsInfo);
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}
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for (window = start_window; window < wins_per_frame; window++) {
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FIXP_DBL *pSpectrum;
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{ pSpectrum = SPEC(pSpectralCoefficient, window, granuleLength); }
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for (index = 0; index < pTnsData->NumberOfFilters[window]; index++) {
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CFilter *filter = &pTnsData->Filter[window][index];
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if (filter->Order > 0) {
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FIXP_TCC *pCoeff;
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UCHAR tns_max_bands;
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pCoeff = coeff;
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if (filter->Resolution == 3) {
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int i;
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for (i = 0; i < filter->Order; i++)
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*pCoeff++ = FDKaacDec_tnsCoeff3[filter->Coeff[i] + 4];
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} else {
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int i;
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for (i = 0; i < filter->Order; i++)
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*pCoeff++ = FDKaacDec_tnsCoeff4[filter->Coeff[i] + 8];
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}
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switch (granuleLength) {
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case 480:
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tns_max_bands =
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tns_max_bands_tbl_480[pSamplingRateInfo->samplingRateIndex];
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break;
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case 512:
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tns_max_bands =
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tns_max_bands_tbl_512[pSamplingRateInfo->samplingRateIndex];
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break;
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default:
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tns_max_bands = GetMaximumTnsBands(
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pIcsInfo, pSamplingRateInfo->samplingRateIndex);
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/* See redefinition of TNS_MAX_BANDS table */
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if ((flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA)) &&
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(pSamplingRateInfo->samplingRateIndex > 5)) {
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tns_max_bands += 1;
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}
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break;
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}
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start = fixMin(fixMin(filter->StartBand, tns_max_bands), nbands);
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start = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[start];
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if (igf_active) {
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stop = fixMin(filter->StopBand, nbands);
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} else {
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stop = fixMin(fixMin(filter->StopBand, tns_max_bands), nbands);
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}
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stop = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[stop];
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size = stop - start;
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if (size) {
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C_ALLOC_SCRATCH_START(state, FIXP_DBL, TNS_MAXIMUM_ORDER)
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FDKmemclear(state, TNS_MAXIMUM_ORDER * sizeof(FIXP_DBL));
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CLpc_SynthesisLattice(pSpectrum + start, size, 0, 0,
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filter->Direction, coeff, filter->Order,
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state);
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C_ALLOC_SCRATCH_END(state, FIXP_DBL, TNS_MAXIMUM_ORDER)
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}
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}
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}
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}
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C_AALLOC_SCRATCH_END(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER)
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}
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}
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