1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Frderung der angewandten 5 Forschung e.V. All rights reserved. 6 7 1. INTRODUCTION 8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software 9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding 10 scheme for digital audio. This FDK AAC Codec software is intended to be used on 11 a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient 14 general perceptual audio codecs. AAC-ELD is considered the best-performing 15 full-bandwidth communications codec by independent studies and is widely 16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG 17 specifications. 18 19 Patent licenses for necessary patent claims for the FDK AAC Codec (including 20 those of Fraunhofer) may be obtained through Via Licensing 21 (www.vialicensing.com) or through the respective patent owners individually for 22 the purpose of encoding or decoding bit streams in products that are compliant 23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of 24 Android devices already license these patent claims through Via Licensing or 25 directly from the patent owners, and therefore FDK AAC Codec software may 26 already be covered under those patent licenses when it is used for those 27 licensed purposes only. 28 29 Commercially-licensed AAC software libraries, including floating-point versions 30 with enhanced sound quality, are also available from Fraunhofer. Users are 31 encouraged to check the Fraunhofer website for additional applications 32 information and documentation. 33 34 2. COPYRIGHT LICENSE 35 36 Redistribution and use in source and binary forms, with or without modification, 37 are permitted without payment of copyright license fees provided that you 38 satisfy the following conditions: 39 40 You must retain the complete text of this software license in redistributions of 41 the FDK AAC Codec or your modifications thereto in source code form. 42 43 You must retain the complete text of this software license in the documentation 44 and/or other materials provided with redistributions of the FDK AAC Codec or 45 your modifications thereto in binary form. You must make available free of 46 charge copies of the complete source code of the FDK AAC Codec and your 47 modifications thereto to recipients of copies in binary form. 48 49 The name of Fraunhofer may not be used to endorse or promote products derived 50 from this library without prior written permission. 51 52 You may not charge copyright license fees for anyone to use, copy or distribute 53 the FDK AAC Codec software or your modifications thereto. 54 55 Your modified versions of the FDK AAC Codec must carry prominent notices stating 56 that you changed the software and the date of any change. For modified versions 57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" 58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK 59 AAC Codec Library for Android." 60 61 3. NO PATENT LICENSE 62 63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without 64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. 65 Fraunhofer provides no warranty of patent non-infringement with respect to this 66 software. 67 68 You may use this FDK AAC Codec software or modifications thereto only for 69 purposes that are authorized by appropriate patent licenses. 70 71 4. DISCLAIMER 72 73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright 74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, 75 including but not limited to the implied warranties of merchantability and 76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, 78 or consequential damages, including but not limited to procurement of substitute 79 goods or services; loss of use, data, or profits, or business interruption, 80 however caused and on any theory of liability, whether in contract, strict 81 liability, or tort (including negligence), arising in any way out of the use of 82 this software, even if advised of the possibility of such damage. 83 84 5. CONTACT INFORMATION 85 86 Fraunhofer Institute for Integrated Circuits IIS 87 Attention: Audio and Multimedia Departments - FDK AAC LL 88 Am Wolfsmantel 33 89 91058 Erlangen, Germany 90 91 www.iis.fraunhofer.de/amm 92 amm-info (at) iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /**************************** SBR decoder library ****************************** 96 97 Author(s): 98 99 Description: 100 101 *******************************************************************************/ 102 103 /*! 104 \file 105 \brief Envelope calculation prototypes 106 */ 107 #ifndef ENV_CALC_H 108 #define ENV_CALC_H 109 110 #include "sbrdecoder.h" 111 #include "env_extr.h" /* for HANDLE_SBR_HEADER_DATA */ 112 113 typedef struct { 114 FIXP_DBL filtBuffer[MAX_FREQ_COEFFS]; /*!< previous gains (required for 115 smoothing) */ 116 FIXP_DBL filtBufferNoise[MAX_FREQ_COEFFS]; /*!< previous noise levels 117 (required for smoothing) */ 118 SCHAR filtBuffer_e[MAX_FREQ_COEFFS]; /*!< Exponents of previous gains */ 119 SCHAR filtBufferNoise_e; /*!< Common exponent of previous noise levels */ 120 121 int startUp; /*!< flag to signal initial conditions in buffers */ 122 int phaseIndex; /*!< Index for randomPase array */ 123 int prevTranEnv; /*!< The transient envelope of the previous frame. */ 124 125 ULONG harmFlagsPrev[ADD_HARMONICS_FLAGS_SIZE]; 126 /*!< Words with 16 flags each indicating where a sine was added in the 127 * previous frame.*/ 128 UCHAR harmIndex; /*!< Current phase of synthetic sine */ 129 int sbrPatchingMode; /*!< Current patching mode */ 130 131 FIXP_SGL prevSbrNoiseFloorLevel[MAX_NOISE_COEFFS]; 132 UCHAR prevNNfb; 133 UCHAR prevNSfb[2]; 134 UCHAR prevLoSubband; 135 UCHAR prevHiSubband; 136 UCHAR prev_ov_highSubband; 137 UCHAR *prevFreqBandTable[2]; 138 UCHAR prevFreqBandTableLo[MAX_FREQ_COEFFS / 2 + 1]; 139 UCHAR prevFreqBandTableHi[MAX_FREQ_COEFFS + 1]; 140 UCHAR prevFreqBandTableNoise[MAX_NOISE_COEFFS + 1]; 141 SCHAR sinusoidal_positionPrev; 142 ULONG harmFlagsPrevActive[ADD_HARMONICS_FLAGS_SIZE]; 143 } SBR_CALCULATE_ENVELOPE; 144 145 typedef SBR_CALCULATE_ENVELOPE *HANDLE_SBR_CALCULATE_ENVELOPE; 146 147 void calculateSbrEnvelope( 148 QMF_SCALE_FACTOR *sbrScaleFactor, 149 HANDLE_SBR_CALCULATE_ENVELOPE h_sbr_cal_env, 150 HANDLE_SBR_HEADER_DATA hHeaderData, HANDLE_SBR_FRAME_DATA hFrameData, 151 PVC_DYNAMIC_DATA *pPvcDynamicData, FIXP_DBL **analysBufferReal, 152 FIXP_DBL * 153 *analysBufferImag, /*!< Imag part of subband samples to be processed */ 154 const int useLP, 155 FIXP_DBL *degreeAlias, /*!< Estimated aliasing for each QMF channel */ 156 const UINT flags, const int frameErrorFlag); 157 158 SBR_ERROR 159 createSbrEnvelopeCalc(HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope, 160 HANDLE_SBR_HEADER_DATA hHeaderData, const int chan, 161 const UINT flags); 162 163 int deleteSbrEnvelopeCalc(HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope); 164 165 void resetSbrEnvelopeCalc(HANDLE_SBR_CALCULATE_ENVELOPE hCalEnv); 166 167 SBR_ERROR 168 ResetLimiterBands(UCHAR *limiterBandTable, UCHAR *noLimiterBands, 169 UCHAR *freqBandTable, int noFreqBands, 170 const PATCH_PARAM *patchParam, int noPatches, 171 int limiterBands, UCHAR sbrPatchingMode, 172 int xOverQmf[MAX_NUM_PATCHES], int sbrRatio); 173 174 void rescaleSubbandSamples(FIXP_DBL **re, FIXP_DBL **im, int lowSubband, 175 int noSubbands, int start_pos, int next_pos, 176 int shift); 177 178 FIXP_DBL maxSubbandSample(FIXP_DBL **analysBufferReal_m, 179 FIXP_DBL **analysBufferImag_m, int lowSubband, 180 int highSubband, int start_pos, int stop_pos); 181 182 #endif // ENV_CALC_H 183
