1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2015 Fraunhofer-Gesellschaft zur Frderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16 of the MPEG specifications. 17 18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20 individually for the purpose of encoding or decoding bit streams in products that are compliant with 21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23 software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27 applications information and documentation. 28 29 2. COPYRIGHT LICENSE 30 31 Redistribution and use in source and binary forms, with or without modification, are permitted without 32 payment of copyright license fees provided that you satisfy the following conditions: 33 34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35 your modifications thereto in source code form. 36 37 You must retain the complete text of this software license in the documentation and/or other materials 38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40 modifications thereto to recipients of copies in binary form. 41 42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43 prior written permission. 44 45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46 software or your modifications thereto. 47 48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49 and the date of any change. For modified versions of the FDK AAC Codec, the term 50 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term 51 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 52 53 3. NO PATENT LICENSE 54 55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57 respect to this software. 58 59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60 by appropriate patent licenses. 61 62 4. DISCLAIMER 63 64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors 65 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties 66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69 or business interruption, however caused and on any theory of liability, whether in contract, strict 70 liability, or tort (including negligence), arising in any way out of the use of this software, even if 71 advised of the possibility of such damage. 72 73 5. CONTACT INFORMATION 74 75 Fraunhofer Institute for Integrated Circuits IIS 76 Attention: Audio and Multimedia Departments - FDK AAC LL 77 Am Wolfsmantel 33 78 91058 Erlangen, Germany 79 80 www.iis.fraunhofer.de/amm 81 amm-info (at) iis.fraunhofer.de 82 ----------------------------------------------------------------------------------------------------------- */ 83 84 /******************************** MPEG Audio Encoder ************************** 85 86 Initial author: Alex Groeschel 87 contents/description: Temporal noise shaping 88 89 ******************************************************************************/ 90 91 #ifndef _TNS_H 92 #define _TNS_H 93 94 #include "common_fix.h" 95 96 #include "psy_const.h" 97 98 99 #ifndef PI 100 #define PI 3.1415926535897931f 101 #endif 102 103 /** 104 * TNS_ENABLE_MASK 105 * This bitfield defines which TNS features are enabled 106 * The TNS mask is composed of 4 bits. 107 * tnsMask |= 0x1; activate TNS short blocks 108 * tnsMask |= 0x2; activate TNS for long blocks 109 * tnsMask |= 0x4; activate TNS PEAK tool for short blocks 110 * tnsMask |= 0x8; activate TNS PEAK tool for long blocks 111 */ 112 #define TNS_ENABLE_MASK 0xf 113 114 /* TNS max filter order for Low Complexity MPEG4 profile */ 115 #define TNS_MAX_ORDER 12 116 117 118 #define MAX_NUM_OF_FILTERS 2 119 120 #define HIFILT 0 /* index of higher filter */ 121 #define LOFILT 1 /* index of lower filter */ 122 123 124 typedef struct{ /* stuff that is tabulated dependent on bitrate etc. */ 125 INT filterEnabled[MAX_NUM_OF_FILTERS]; 126 INT threshOn[MAX_NUM_OF_FILTERS]; /* min. prediction gain for using tns TABUL*/ 127 INT filterStartFreq[MAX_NUM_OF_FILTERS]; /* lowest freq for lpc TABUL*/ 128 INT tnsLimitOrder[MAX_NUM_OF_FILTERS]; /* Limit for TNS order TABUL*/ 129 INT tnsFilterDirection[MAX_NUM_OF_FILTERS]; /* Filtering direction, 0=up, 1=down TABUL */ 130 INT acfSplit[MAX_NUM_OF_FILTERS]; 131 FIXP_DBL tnsTimeResolution[MAX_NUM_OF_FILTERS]; /* TNS max. time resolution TABUL. Should be fract but MSVC won't compile then */ 132 INT seperateFiltersAllowed; 133 } TNS_PARAMETER_TABULATED; 134 135 136 typedef struct { /*assigned at InitTime*/ 137 TNS_PARAMETER_TABULATED confTab; 138 INT isLowDelay; 139 INT tnsActive; 140 INT maxOrder; /* max. order of tns filter */ 141 INT coefRes; 142 FIXP_DBL acfWindow[MAX_NUM_OF_FILTERS][TNS_MAX_ORDER+3+1]; 143 /* now some things that only probably can be done at Init time; 144 could be they have to be split up for each individual (short) window or 145 even filter. */ 146 INT lpcStartBand[MAX_NUM_OF_FILTERS]; 147 INT lpcStartLine[MAX_NUM_OF_FILTERS]; 148 INT lpcStopBand; 149 INT lpcStopLine; 150 151 }TNS_CONFIG; 152 153 154 typedef struct { 155 INT tnsActive[MAX_NUM_OF_FILTERS]; 156 INT predictionGain[MAX_NUM_OF_FILTERS]; 157 } TNS_SUBBLOCK_INFO; 158 159 typedef struct{ /*changed at runTime*/ 160 TNS_SUBBLOCK_INFO subBlockInfo[TRANS_FAC]; 161 FIXP_DBL ratioMultTable[TRANS_FAC][MAX_SFB_SHORT]; 162 } TNS_DATA_SHORT; 163 164 typedef struct{ /*changed at runTime*/ 165 TNS_SUBBLOCK_INFO subBlockInfo; 166 FIXP_DBL ratioMultTable[MAX_SFB_LONG]; 167 } TNS_DATA_LONG; 168 169 /* can be implemented as union */ 170 typedef shouldBeUnion{ 171 TNS_DATA_LONG Long; 172 TNS_DATA_SHORT Short; 173 }TNS_DATA_RAW; 174 175 typedef struct{ 176 INT numOfSubblocks; 177 TNS_DATA_RAW dataRaw; 178 INT tnsMaxScaleSpec; 179 INT filtersMerged; 180 }TNS_DATA; 181 182 typedef struct{ 183 INT numOfFilters[TRANS_FAC]; 184 INT coefRes[TRANS_FAC]; 185 INT length[TRANS_FAC][MAX_NUM_OF_FILTERS]; 186 INT order[TRANS_FAC][MAX_NUM_OF_FILTERS]; 187 INT direction[TRANS_FAC][MAX_NUM_OF_FILTERS]; 188 INT coefCompress[TRANS_FAC][MAX_NUM_OF_FILTERS]; 189 /* for Long: length TNS_MAX_ORDER (12 for LC) is required -> 12 */ 190 /* for Short: length TRANS_FAC*TNS_MAX_ORDER (only 5 for short LC) is required -> 8*5=40 */ 191 /* Currently TRANS_FAC*TNS_MAX_ORDER = 8*12 = 96 (for LC) is used (per channel)! Memory could be saved here! */ 192 INT coef[TRANS_FAC][MAX_NUM_OF_FILTERS][TNS_MAX_ORDER]; 193 }TNS_INFO; 194 195 INT FDKaacEnc_FreqToBandWithRounding( 196 const INT freq, 197 const INT fs, 198 const INT numOfBands, 199 const INT *bandStartOffset 200 ); 201 202 #endif /* _TNS_H */ 203
