1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5� Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16of the MPEG specifications. 17 18Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20individually for the purpose of encoding or decoding bit streams in products that are compliant with 21the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27applications information and documentation. 28 292. COPYRIGHT LICENSE 30 31Redistribution and use in source and binary forms, with or without modification, are permitted without 32payment of copyright license fees provided that you satisfy the following conditions: 33 34You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35your modifications thereto in source code form. 36 37You must retain the complete text of this software license in the documentation and/or other materials 38provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40modifications thereto to recipients of copies in binary form. 41 42The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43prior written permission. 44 45You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46software or your modifications thereto. 47 48Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49and 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." 52 533. NO PATENT LICENSE 54 55NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57respect to this software. 58 59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60by appropriate patent licenses. 61 624. DISCLAIMER 63 64This 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 66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69or business interruption, however caused and on any theory of liability, whether in contract, strict 70liability, or tort (including negligence), arising in any way out of the use of this software, even if 71advised of the possibility of such damage. 72 735. CONTACT INFORMATION 74 75Fraunhofer Institute for Integrated Circuits IIS 76Attention: Audio and Multimedia Departments - FDK AAC LL 77Am Wolfsmantel 33 7891058 Erlangen, Germany 79 80www.iis.fraunhofer.de/amm 81amm-info@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 121typedef struct{ /*stuff that is tabulated dependent on bitrate etc. */ 122 INT filterEnabled[MAX_NUM_OF_FILTERS]; 123 INT threshOn[MAX_NUM_OF_FILTERS]; /* min. prediction gain for using tns TABUL*/ 124 INT tnsLimitOrder[MAX_NUM_OF_FILTERS]; /* Limit for TNS order TABUL*/ 125 INT tnsFilterDirection[MAX_NUM_OF_FILTERS]; /* Filtering direction, 0=up, 1=down TABUL */ 126 INT acfSplit[MAX_NUM_OF_FILTERS]; 127 INT seperateFiltersAllowed; 128 129}TNS_CONFIG_TABULATED; 130 131 132 133typedef struct { /*assigned at InitTime*/ 134 TNS_CONFIG_TABULATED confTab; 135 INT tnsActive; 136 INT maxOrder; /* max. order of tns filter */ 137 INT coefRes; 138 FIXP_DBL acfWindow[MAX_NUM_OF_FILTERS][TNS_MAX_ORDER+3+1]; 139 /* now some things that only probably can be done at Init time; 140 could be they have to be split up for each individual (short) window or 141 even filter. */ 142 INT lpcStartBand[MAX_NUM_OF_FILTERS]; 143 INT lpcStartLine[MAX_NUM_OF_FILTERS]; 144 INT lpcStopBand; 145 INT lpcStopLine; 146 147}TNS_CONFIG; 148 149 150typedef struct { 151 INT tnsActive; 152 INT predictionGain; 153} TNS_SUBBLOCK_INFO; 154 155typedef struct{ /*changed at runTime*/ 156 TNS_SUBBLOCK_INFO subBlockInfo[TRANS_FAC]; 157 FIXP_DBL ratioMultTable[TRANS_FAC][MAX_SFB_SHORT]; 158} TNS_DATA_SHORT; 159 160typedef struct{ /*changed at runTime*/ 161 TNS_SUBBLOCK_INFO subBlockInfo; 162 FIXP_DBL ratioMultTable[MAX_SFB_LONG]; 163} TNS_DATA_LONG; 164 165/* can be implemented as union */ 166typedef shouldBeUnion{ 167 TNS_DATA_LONG Long; 168 TNS_DATA_SHORT Short; 169}TNS_DATA_RAW; 170 171typedef struct{ 172 INT numOfSubblocks; 173 TNS_DATA_RAW dataRaw; 174 INT tnsMaxScaleSpec; 175 INT filtersMerged; 176}TNS_DATA; 177 178typedef struct{ 179 INT numOfFilters[TRANS_FAC]; 180 INT coefRes[TRANS_FAC]; 181 INT length[TRANS_FAC][MAX_NUM_OF_FILTERS]; 182 INT order[TRANS_FAC][MAX_NUM_OF_FILTERS]; 183 INT direction[TRANS_FAC][MAX_NUM_OF_FILTERS]; 184 INT coefCompress[TRANS_FAC][MAX_NUM_OF_FILTERS]; 185 /* for Long: length TNS_MAX_ORDER (12 for LC) is required -> 12 */ 186 /* for Short: length TRANS_FAC*TNS_MAX_ORDER (only 5 for short LC) is required -> 8*5=40 */ 187 /* Currently TRANS_FAC*TNS_MAX_ORDER = 8*12 = 96 (for LC) is used (per channel)! Memory could be saved here! */ 188 INT coef[TRANS_FAC][MAX_NUM_OF_FILTERS][TNS_MAX_ORDER]; 189}TNS_INFO; 190 191INT FDKaacEnc_FreqToBandWithRounding( 192 const INT freq, 193 const INT fs, 194 const INT numOfBands, 195 const INT *bandStartOffset 196 ); 197 198#endif /* _TNS_H */ 199