/* -----------------------------------------------------------------------------
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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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/**************************** SBR decoder library ******************************
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Author(s):
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Description:
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*******************************************************************************/
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/*!
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\file
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\brief Envelope calculation prototypes
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*/
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#ifndef ENV_CALC_H
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#define ENV_CALC_H
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#include "sbrdecoder.h"
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#include "env_extr.h" /* for HANDLE_SBR_HEADER_DATA */
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typedef struct {
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FIXP_DBL filtBuffer[MAX_FREQ_COEFFS]; /*!< previous gains (required for
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smoothing) */
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FIXP_DBL filtBufferNoise[MAX_FREQ_COEFFS]; /*!< previous noise levels
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(required for smoothing) */
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SCHAR filtBuffer_e[MAX_FREQ_COEFFS]; /*!< Exponents of previous gains */
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SCHAR filtBufferNoise_e; /*!< Common exponent of previous noise levels */
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int startUp; /*!< flag to signal initial conditions in buffers */
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int phaseIndex; /*!< Index for randomPase array */
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int prevTranEnv; /*!< The transient envelope of the previous frame. */
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ULONG harmFlagsPrev[ADD_HARMONICS_FLAGS_SIZE];
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/*!< Words with 16 flags each indicating where a sine was added in the
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* previous frame.*/
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UCHAR harmIndex; /*!< Current phase of synthetic sine */
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int sbrPatchingMode; /*!< Current patching mode */
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FIXP_SGL prevSbrNoiseFloorLevel[MAX_NOISE_COEFFS];
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UCHAR prevNNfb;
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UCHAR prevNSfb[2];
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UCHAR prevLoSubband;
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UCHAR prevHiSubband;
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UCHAR prev_ov_highSubband;
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UCHAR *prevFreqBandTable[2];
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UCHAR prevFreqBandTableLo[MAX_FREQ_COEFFS / 2 + 1];
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UCHAR prevFreqBandTableHi[MAX_FREQ_COEFFS + 1];
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UCHAR prevFreqBandTableNoise[MAX_NOISE_COEFFS + 1];
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SCHAR sinusoidal_positionPrev;
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ULONG harmFlagsPrevActive[ADD_HARMONICS_FLAGS_SIZE];
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} SBR_CALCULATE_ENVELOPE;
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typedef SBR_CALCULATE_ENVELOPE *HANDLE_SBR_CALCULATE_ENVELOPE;
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void calculateSbrEnvelope(
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QMF_SCALE_FACTOR *sbrScaleFactor,
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HANDLE_SBR_CALCULATE_ENVELOPE h_sbr_cal_env,
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HANDLE_SBR_HEADER_DATA hHeaderData, HANDLE_SBR_FRAME_DATA hFrameData,
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PVC_DYNAMIC_DATA *pPvcDynamicData, FIXP_DBL **analysBufferReal,
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FIXP_DBL *
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*analysBufferImag, /*!< Imag part of subband samples to be processed */
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const int useLP,
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FIXP_DBL *degreeAlias, /*!< Estimated aliasing for each QMF channel */
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const UINT flags, const int frameErrorFlag);
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SBR_ERROR
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createSbrEnvelopeCalc(HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope,
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HANDLE_SBR_HEADER_DATA hHeaderData, const int chan,
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const UINT flags);
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int deleteSbrEnvelopeCalc(HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope);
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void resetSbrEnvelopeCalc(HANDLE_SBR_CALCULATE_ENVELOPE hCalEnv);
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SBR_ERROR
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ResetLimiterBands(UCHAR *limiterBandTable, UCHAR *noLimiterBands,
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UCHAR *freqBandTable, int noFreqBands,
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const PATCH_PARAM *patchParam, int noPatches,
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int limiterBands, UCHAR sbrPatchingMode,
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int xOverQmf[MAX_NUM_PATCHES], int sbrRatio);
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void rescaleSubbandSamples(FIXP_DBL **re, FIXP_DBL **im, int lowSubband,
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int noSubbands, int start_pos, int next_pos,
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int shift);
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FIXP_DBL maxSubbandSample(FIXP_DBL **analysBufferReal_m,
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FIXP_DBL **analysBufferImag_m, int lowSubband,
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int highSubband, int start_pos, int stop_pos);
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#endif // ENV_CALC_H
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