1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5� Copyright 1995 - 2015 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: M.Lohwasser 87 contents/description: PNS parameters depending on bitrate and bandwidth 88 89******************************************************************************/ 90 91#include "pnsparam.h" 92#include "psy_configuration.h" 93 94typedef struct { 95 SHORT startFreq; 96 /* Parameters for detection */ 97 FIXP_SGL refPower; 98 FIXP_SGL refTonality; 99 SHORT tnsGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */ 100 SHORT tnsPNSGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */ 101 FIXP_SGL gapFillThr; 102 SHORT minSfbWidth; 103 USHORT detectionAlgorithmFlags; 104} PNS_INFO_TAB; 105 106 107typedef struct { 108 ULONG brFrom; 109 ULONG brTo; 110 UCHAR S16000; 111 UCHAR S22050; 112 UCHAR S24000; 113 UCHAR S32000; 114 UCHAR S44100; 115 UCHAR S48000; 116} AUTO_PNS_TAB; 117 118static const AUTO_PNS_TAB levelTable_mono[]= { 119 {0, 11999, 0, 1, 1, 1, 1, 1,}, 120 {12000, 19999, 0, 1, 1, 1, 1, 1,}, 121 {20000, 28999, 0, 2, 1, 1, 1, 1,}, 122 {29000, 40999, 0, 4, 4, 4, 2, 2,}, 123 {41000, 55999, 0, 9, 9, 7, 7, 7,}, 124 {56000, 61999, 0, 0, 0, 0, 9, 9,}, 125 {62000, 75999, 0, 0, 0, 0, 0, 0,}, 126 {76000, 92999, 0, 0, 0, 0, 0, 0,}, 127 {93000, 999999, 0, 0, 0, 0, 0, 0,}, 128}; 129 130static const AUTO_PNS_TAB levelTable_stereo[]= { 131 {0, 11999, 0, 1, 1, 1, 1, 1,}, 132 {12000, 19999, 0, 3, 1, 1, 1, 1,}, 133 {20000, 28999, 0, 3, 3, 3, 2, 2,}, 134 {29000, 40999, 0, 7, 6, 6, 5, 5,}, 135 {41000, 55999, 0, 9, 9, 7, 7, 7,}, 136 {56000, 79999, 0, 0, 0, 0, 0, 0,}, 137 {80000, 99999, 0, 0, 0, 0, 0, 0,}, 138 {100000,999999, 0, 0, 0, 0, 0, 0,}, 139}; 140 141 142static const PNS_INFO_TAB pnsInfoTab[] = { 143/*0 pns off */ 144/*1*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.06), 1150, 1200, FL2FXCONST_SGL(0.02), 8, 145 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ }, 146/*2*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1130, 1300, FL2FXCONST_SGL(0.05), 8, 147 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ }, 148/*3*/ { 4100, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1100, 1400, FL2FXCONST_SGL(0.10), 8, 149 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ }, 150/*4*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8, 151 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ }, 152/*5*/ { 4300, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8, 153 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 154/*6*/ { 5000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.25), 8, 155 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 156/*7*/ { 5500, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1100, 1400, FL2FXCONST_SGL(0.35), 8, 157 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 158/*8*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1080, 1400, FL2FXCONST_SGL(0.40), 8, 159 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 160/*9*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.14), 1070, 1400, FL2FXCONST_SGL(0.45), 8, 161 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 162}; 163 164static const AUTO_PNS_TAB levelTable_lowComplexity[]= { 165 {0, 27999, 0, 0, 0, 0, 0, 0,}, 166 {28000, 31999, 0, 2, 2, 2, 2, 2,}, 167 {32000, 47999, 0, 3, 3, 3, 3, 3,}, 168 {48000, 48000, 0, 4, 4, 4, 4, 4,}, 169 {48001, 999999, 0, 0, 0, 0, 0, 0,}, 170}; 171 172/* conversion of old LC tuning tables to new (LD enc) structure (only entries which are actually used were converted) */ 173static const PNS_INFO_TAB pnsInfoTab_lowComplexity[] = { 174/*0 pns off */ 175 /* DEFAULT parameter set */ 176/*1*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.16), 1100, 1400, FL2FXCONST_SGL(0.5), 16, 177 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 178/*2*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16, 179 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 180/*3*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.5), 16, 181 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 182 /* LOWSUBST -> PNS is used less often than with DEFAULT parameter set (for br: 48000 - 79999) */ 183/*4*/ { 4100, FL2FXCONST_SGL(0.20), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16, 184 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, 185}; 186 187/**************************************************************************** 188 function to look up used pns level 189****************************************************************************/ 190int FDKaacEnc_lookUpPnsUse (int bitRate, int sampleRate, int numChan, const int isLC) { 191 192 int hUsePns=0, size, i; 193 const AUTO_PNS_TAB *levelTable; 194 195 if (isLC) { 196 levelTable = &levelTable_lowComplexity[0]; 197 size = sizeof(levelTable_lowComplexity); 198 } else 199 { /* (E)LD */ 200 levelTable = (numChan > 1) ? &levelTable_stereo[0] : &levelTable_mono[0]; 201 size = (numChan > 1) ? sizeof(levelTable_stereo) : sizeof(levelTable_mono); 202 } 203 204 for(i = 0; i < (int) (size/sizeof(AUTO_PNS_TAB)); i++) { 205 if(((ULONG)bitRate >= levelTable[i].brFrom) && 206 ((ULONG)bitRate <= levelTable[i].brTo) ) 207 break; 208 } 209 210 /* sanity check */ 211 if ((int)(sizeof(pnsInfoTab)/sizeof(PNS_INFO_TAB)) < i ) { 212 return (PNS_TABLE_ERROR); 213 } 214 215 switch (sampleRate) { 216 case 16000: hUsePns = levelTable[i].S16000; break; 217 case 22050: hUsePns = levelTable[i].S22050; break; 218 case 24000: hUsePns = levelTable[i].S24000; break; 219 case 32000: hUsePns = levelTable[i].S32000; break; 220 case 44100: hUsePns = levelTable[i].S44100; break; 221 case 48000: hUsePns = levelTable[i].S48000; break; 222 default: 223 if (isLC) { 224 hUsePns = levelTable[i].S48000; 225 } 226 break; 227 } 228 229 return (hUsePns); 230} 231 232 233/***************************************************************************** 234 235 functionname: FDKaacEnc_GetPnsParam 236 description: Gets PNS parameters depending on bitrate and bandwidth 237 returns: error status 238 input: Noiseparams struct, bitrate, sampling rate, 239 number of sfb's, pointer to sfb offset 240 output: PNS parameters 241 242*****************************************************************************/ 243AAC_ENCODER_ERROR FDKaacEnc_GetPnsParam(NOISEPARAMS *np, 244 INT bitRate, 245 INT sampleRate, 246 INT sfbCnt, 247 const INT *sfbOffset, 248 INT *usePns, 249 INT numChan, 250 const int isLC) 251 252{ 253 int i, hUsePns; 254 const PNS_INFO_TAB *pnsInfo; 255 256 if (isLC) { 257 np->detectionAlgorithmFlags = IS_LOW_COMLEXITY; 258 pnsInfo = pnsInfoTab_lowComplexity; 259 } 260 else 261 { 262 np->detectionAlgorithmFlags = 0; 263 pnsInfo = pnsInfoTab; 264 } 265 266 if (*usePns<=0) 267 return AAC_ENC_OK; 268 269 /* new pns params */ 270 hUsePns = FDKaacEnc_lookUpPnsUse (bitRate, sampleRate, numChan, isLC); 271 if (hUsePns == 0) { 272 *usePns = 0; 273 return AAC_ENC_OK; 274 } 275 if (hUsePns == PNS_TABLE_ERROR) 276 return AAC_ENC_PNS_TABLE_ERROR; 277 278 /* select correct row of tuning table */ 279 pnsInfo += hUsePns-1; 280 281 np->startSfb = FDKaacEnc_FreqToBandWithRounding( pnsInfo->startFreq, 282 sampleRate, 283 sfbCnt, 284 sfbOffset ); 285 286 np->detectionAlgorithmFlags |= pnsInfo->detectionAlgorithmFlags; 287 288 np->refPower = FX_SGL2FX_DBL(pnsInfo->refPower); 289 np->refTonality = FX_SGL2FX_DBL(pnsInfo->refTonality); 290 np->tnsGainThreshold = pnsInfo->tnsGainThreshold; 291 np->tnsPNSGainThreshold = pnsInfo->tnsPNSGainThreshold; 292 np->minSfbWidth = pnsInfo->minSfbWidth; 293 294 np->gapFillThr = (FIXP_SGL)pnsInfo->gapFillThr; 295 296 /* assuming a constant dB/Hz slope in the signal's PSD curve, 297 the detection threshold needs to be corrected for the width of the band */ 298 for ( i = 0; i < (sfbCnt-1); i++) 299 { 300 INT qtmp, sfbWidth; 301 FIXP_DBL tmp; 302 303 sfbWidth = sfbOffset[i+1]-sfbOffset[i]; 304 305 tmp = fPow(np->refPower, 0, sfbWidth, DFRACT_BITS-1-5, &qtmp); 306 np->powDistPSDcurve[i] = (FIXP_SGL)((LONG)(scaleValue(tmp, qtmp) >> 16)); 307 } 308 np->powDistPSDcurve[sfbCnt] = np->powDistPSDcurve[sfbCnt-1]; 309 310 return AAC_ENC_OK; 311} 312