1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung 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@iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /**************************** AAC encoder library ****************************** 96 97 Author(s): Alex Groeschel 98 99 Description: Temporal noise shaping 100 101 *******************************************************************************/ 102 103 #ifndef AACENC_TNS_H 104 #define AACENC_TNS_H 105 106 #include "common_fix.h" 107 108 #include "psy_const.h" 109 110 #ifndef PI 111 #define PI 3.1415926535897931f 112 #endif 113 114 /** 115 * TNS_ENABLE_MASK 116 * This bitfield defines which TNS features are enabled 117 * The TNS mask is composed of 4 bits. 118 * tnsMask |= 0x1; activate TNS short blocks 119 * tnsMask |= 0x2; activate TNS for long blocks 120 * tnsMask |= 0x4; activate TNS PEAK tool for short blocks 121 * tnsMask |= 0x8; activate TNS PEAK tool for long blocks 122 */ 123 #define TNS_ENABLE_MASK 0xf 124 125 /* TNS max filter order for Low Complexity MPEG4 profile */ 126 #define TNS_MAX_ORDER 12 127 128 #define MAX_NUM_OF_FILTERS 2 129 130 #define HIFILT 0 /* index of higher filter */ 131 #define LOFILT 1 /* index of lower filter */ 132 133 typedef struct { /* stuff that is tabulated dependent on bitrate etc. */ 134 INT filterEnabled[MAX_NUM_OF_FILTERS]; 135 INT threshOn[MAX_NUM_OF_FILTERS]; /* min. prediction gain for using tns 136 TABUL*/ 137 INT filterStartFreq[MAX_NUM_OF_FILTERS]; /* lowest freq for lpc TABUL*/ 138 INT tnsLimitOrder[MAX_NUM_OF_FILTERS]; /* Limit for TNS order TABUL*/ 139 INT tnsFilterDirection[MAX_NUM_OF_FILTERS]; /* Filtering direction, 0=up, 140 1=down TABUL */ 141 INT acfSplit[MAX_NUM_OF_FILTERS]; 142 FIXP_DBL tnsTimeResolution[MAX_NUM_OF_FILTERS]; /* TNS max. time resolution 143 TABUL. Should be fract but 144 MSVC won't compile then */ 145 INT seperateFiltersAllowed; 146 } TNS_PARAMETER_TABULATED; 147 148 typedef struct { /*assigned at InitTime*/ 149 TNS_PARAMETER_TABULATED confTab; 150 INT isLowDelay; 151 INT tnsActive; 152 INT maxOrder; /* max. order of tns filter */ 153 INT coefRes; 154 FIXP_DBL acfWindow[MAX_NUM_OF_FILTERS][TNS_MAX_ORDER + 3 + 1]; 155 /* now some things that only probably can be done at Init time; 156 could be they have to be split up for each individual (short) window or 157 even filter. */ 158 INT lpcStartBand[MAX_NUM_OF_FILTERS]; 159 INT lpcStartLine[MAX_NUM_OF_FILTERS]; 160 INT lpcStopBand; 161 INT lpcStopLine; 162 163 } TNS_CONFIG; 164 165 typedef struct { 166 INT tnsActive[MAX_NUM_OF_FILTERS]; 167 INT predictionGain[MAX_NUM_OF_FILTERS]; 168 } TNS_SUBBLOCK_INFO; 169 170 typedef struct { /*changed at runTime*/ 171 TNS_SUBBLOCK_INFO subBlockInfo[TRANS_FAC]; 172 FIXP_DBL ratioMultTable[TRANS_FAC][MAX_SFB_SHORT]; 173 } TNS_DATA_SHORT; 174 175 typedef struct { /*changed at runTime*/ 176 TNS_SUBBLOCK_INFO subBlockInfo; 177 FIXP_DBL ratioMultTable[MAX_SFB_LONG]; 178 } TNS_DATA_LONG; 179 180 /* can be implemented as union */ 181 typedef shouldBeUnion { 182 TNS_DATA_LONG Long; 183 TNS_DATA_SHORT Short; 184 } 185 TNS_DATA_RAW; 186 187 typedef struct { 188 INT numOfSubblocks; 189 TNS_DATA_RAW dataRaw; 190 INT tnsMaxScaleSpec; 191 INT filtersMerged; 192 } TNS_DATA; 193 194 typedef struct { 195 INT numOfFilters[TRANS_FAC]; 196 INT coefRes[TRANS_FAC]; 197 INT length[TRANS_FAC][MAX_NUM_OF_FILTERS]; 198 INT order[TRANS_FAC][MAX_NUM_OF_FILTERS]; 199 INT direction[TRANS_FAC][MAX_NUM_OF_FILTERS]; 200 INT coefCompress[TRANS_FAC][MAX_NUM_OF_FILTERS]; 201 /* for Long: length TNS_MAX_ORDER (12 for LC) is required -> 12 */ 202 /* for Short: length TRANS_FAC*TNS_MAX_ORDER (only 5 for short LC) is required 203 * -> 8*5=40 */ 204 /* Currently TRANS_FAC*TNS_MAX_ORDER = 8*12 = 96 (for LC) is used (per 205 * channel)! Memory could be saved here! */ 206 INT coef[TRANS_FAC][MAX_NUM_OF_FILTERS][TNS_MAX_ORDER]; 207 } TNS_INFO; 208 209 INT FDKaacEnc_FreqToBandWidthRounding(const INT freq, const INT fs, 210 const INT numOfBands, 211 const INT *bandStartOffset); 212 213 #endif /* AACENC_TNS_H */ 214