1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung 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/************************* Fast MPEG AAC Audio Encoder ********************** 85 86 Initial author: M. Schug / A. Groeschel 87 contents/description: bandwidth expert 88 89******************************************************************************/ 90 91#include "channel_map.h" 92#include "bandwidth.h" 93#include "aacEnc_ram.h" 94 95typedef struct{ 96 INT chanBitRate; 97 INT bandWidthMono; 98 INT bandWidth2AndMoreChan; 99 100} BANDWIDTH_TAB; 101 102static const BANDWIDTH_TAB bandWidthTable[] = { 103 {0, 3700, 5000}, 104 {12000, 5000, 6400}, 105 {20000, 6900, 9640}, 106 {28000, 9600, 13050}, 107 {40000, 12060, 14260}, 108 {56000, 13950, 15500}, 109 {72000, 14200, 16120}, 110 {96000, 17000, 17000}, 111 {576001,17000, 17000} 112}; 113 114 115static const BANDWIDTH_TAB bandWidthTable_LD_22050[] = { 116 { 8000, 2000, 2400}, 117 {12000, 2500, 2700}, 118 {16000, 3300, 3100}, 119 {24000, 6250, 7200}, 120 {32000, 9200, 10500}, 121 {40000, 16000, 16000}, 122 {48000, 16000, 16000}, 123 {360001, 16000, 16000} 124}; 125 126static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = { 127 { 8000, 2000, 2000}, 128 {12000, 2000, 2300}, 129 {16000, 2200, 2500}, 130 {24000, 5650, 6400}, 131 {32000, 11600, 12000}, 132 {40000, 12000, 16000}, 133 {48000, 16000, 16000}, 134 {64000, 16000, 16000}, 135 {360001, 16000, 16000} 136}; 137 138static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = { 139 { 8000, 2000, 2000}, 140 {12000, 2000, 2000}, 141 {24000, 4250, 5200}, 142 {32000, 8400, 9000}, 143 {40000, 9400, 11300}, 144 {48000, 11900, 13700}, 145 {64000, 14800, 16000}, 146 {76000, 16000, 16000}, 147 {360001, 16000, 16000} 148}; 149 150static const BANDWIDTH_TAB bandWidthTable_LD_44100[] = { 151 { 8000, 2000, 2000}, 152 {24000, 2000, 2000}, 153 {32000, 4400, 5700}, 154 {40000, 7400, 8800}, 155 {48000, 9000, 10700}, 156 {56000, 11000, 12900}, 157 {64000, 14400, 15500}, 158 {80000, 16000, 16200}, 159 {96000, 16500, 16000}, 160 {128000, 16000, 16000}, 161 {360001, 16000, 16000} 162}; 163 164static const BANDWIDTH_TAB bandWidthTable_LD_48000[] = { 165 { 8000, 2000, 2000}, 166 {24000, 2000, 2000}, 167 {32000, 4400, 5700}, 168 {40000, 7400, 8800}, 169 {48000, 9000, 10700}, 170 {56000, 11000, 12800}, 171 {64000, 14300, 15400}, 172 {80000, 16000, 16200}, 173 {96000, 16500, 16000}, 174 {128000, 16000, 16000}, 175 {360001, 16000, 16000} 176}; 177 178typedef struct{ 179 AACENC_BITRATE_MODE bitrateMode; 180 int bandWidthMono; 181 int bandWidth2AndMoreChan; 182} BANDWIDTH_TAB_VBR; 183 184static const BANDWIDTH_TAB_VBR bandWidthTableVBR[]= { 185 {AACENC_BR_MODE_CBR, 0, 0}, 186 {AACENC_BR_MODE_VBR_1, 13050, 13050}, 187 {AACENC_BR_MODE_VBR_2, 13050, 13050}, 188 {AACENC_BR_MODE_VBR_3, 14260, 14260}, 189 {AACENC_BR_MODE_VBR_4, 15500, 15500}, 190 {AACENC_BR_MODE_VBR_5, 48000, 48000}, 191 {AACENC_BR_MODE_SFR, 0, 0}, 192 {AACENC_BR_MODE_FF, 0, 0} 193 194}; 195 196static INT GetBandwidthEntry( 197 const INT frameLength, 198 const INT sampleRate, 199 const INT chanBitRate, 200 const INT entryNo) 201{ 202 INT bandwidth = -1; 203 const BANDWIDTH_TAB *pBwTab = NULL; 204 INT bwTabSize = 0; 205 206 switch (frameLength) { 207 case 960: 208 case 1024: 209 pBwTab = bandWidthTable; 210 bwTabSize = sizeof(bandWidthTable)/sizeof(BANDWIDTH_TAB); 211 break; 212 case 480: 213 case 512: 214 switch (sampleRate) { 215 case 8000: 216 case 11025: 217 case 12000: 218 case 16000: 219 case 22050: 220 pBwTab = bandWidthTable_LD_22050; 221 bwTabSize = sizeof(bandWidthTable_LD_22050)/sizeof(BANDWIDTH_TAB); 222 break; 223 case 24000: 224 pBwTab = bandWidthTable_LD_24000; 225 bwTabSize = sizeof(bandWidthTable_LD_24000)/sizeof(BANDWIDTH_TAB); 226 break; 227 case 32000: 228 pBwTab = bandWidthTable_LD_32000; 229 bwTabSize = sizeof(bandWidthTable_LD_32000)/sizeof(BANDWIDTH_TAB); 230 break; 231 case (44100): 232 pBwTab = bandWidthTable_LD_44100; 233 bwTabSize = sizeof(bandWidthTable_LD_44100)/sizeof(BANDWIDTH_TAB); 234 break; 235 case 48000: 236 case 64000: 237 case 88200: 238 case 96000: 239 pBwTab = bandWidthTable_LD_48000; 240 bwTabSize = sizeof(bandWidthTable_LD_48000)/sizeof(BANDWIDTH_TAB); 241 break; 242 } 243 break; 244 default: 245 pBwTab = NULL; 246 bwTabSize = 0; 247 } 248 249 if (pBwTab!=NULL) { 250 int i; 251 for (i=0; i<bwTabSize-1; i++) { 252 if (chanBitRate >= pBwTab[i].chanBitRate && 253 chanBitRate < pBwTab[i+1].chanBitRate) 254 { 255 switch (frameLength) { 256 case 960: 257 case 1024: 258 bandwidth = (entryNo==0) 259 ? pBwTab[i].bandWidthMono 260 : pBwTab[i].bandWidth2AndMoreChan; 261 break; 262 case 480: 263 case 512: 264 { 265 INT q_res = 0; 266 INT startBw = (entryNo==0) ? pBwTab[i ].bandWidthMono : pBwTab[i ].bandWidth2AndMoreChan; 267 INT endBw = (entryNo==0) ? pBwTab[i+1].bandWidthMono : pBwTab[i+1].bandWidth2AndMoreChan; 268 INT startBr = pBwTab[i].chanBitRate; 269 INT endBr = pBwTab[i+1].chanBitRate; 270 271 FIXP_DBL bwFac_fix = fDivNorm(chanBitRate-startBr, endBr-startBr, &q_res); 272 bandwidth = (INT)scaleValue(fMult(bwFac_fix, (FIXP_DBL)(endBw-startBw)),q_res) + startBw; 273 } 274 break; 275 default: 276 bandwidth = -1; 277 } 278 break; 279 } /* within bitrate range */ 280 } 281 } /* pBwTab!=NULL */ 282 283 return bandwidth; 284} 285 286 287AAC_ENCODER_ERROR FDKaacEnc_DetermineBandWidth(INT* bandWidth, 288 INT proposedBandWidth, 289 INT bitrate, 290 AACENC_BITRATE_MODE bitrateMode, 291 INT sampleRate, 292 INT frameLength, 293 CHANNEL_MAPPING* cm, 294 CHANNEL_MODE encoderMode) 295{ 296 AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK; 297 INT chanBitRate = bitrate/cm->nChannels; 298 299 /* vbr */ 300 switch(bitrateMode){ 301 case AACENC_BR_MODE_VBR_1: 302 case AACENC_BR_MODE_VBR_2: 303 case AACENC_BR_MODE_VBR_3: 304 case AACENC_BR_MODE_VBR_4: 305 case AACENC_BR_MODE_VBR_5: 306 if (proposedBandWidth != 0){ 307 /* use given bw */ 308 *bandWidth = proposedBandWidth; 309 } else { 310 /* take bw from table */ 311 switch(encoderMode){ 312 case MODE_1: 313 *bandWidth = bandWidthTableVBR[bitrateMode].bandWidthMono; 314 break; 315 case MODE_2: 316 case MODE_1_2: 317 case MODE_1_2_1: 318 case MODE_1_2_2: 319 case MODE_1_2_2_1: 320 case MODE_1_2_2_2_1: 321 *bandWidth = bandWidthTableVBR[bitrateMode].bandWidth2AndMoreChan; 322 break; 323 default: 324 return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; 325 } 326 } 327 break; 328 case AACENC_BR_MODE_CBR: 329 case AACENC_BR_MODE_SFR: 330 case AACENC_BR_MODE_FF: 331 332 /* bandwidth limiting */ 333 if (proposedBandWidth != 0) { 334 *bandWidth = FDKmin(proposedBandWidth, FDKmin(20000, sampleRate>>1)); 335 } 336 else { /* search reasonable bandwidth */ 337 338 int entryNo = 0; 339 340 switch(encoderMode){ 341 case MODE_1: /* mono */ 342 entryNo = 0; /* use mono bandwith settings */ 343 break; 344 345 case MODE_2: /* stereo */ 346 case MODE_1_2: /* sce + cpe */ 347 case MODE_1_2_1: /* sce + cpe + sce */ 348 case MODE_1_2_2: /* sce + cpe + cpe */ 349 case MODE_1_2_2_1: /* (5.1) sce + cpe + cpe + lfe */ 350 case MODE_1_2_2_2_1: /* (7.1) sce + cpe + cpe + cpe + lfe */ 351 entryNo = 1; /* use stereo bandwith settings */ 352 break; 353 354 default: 355 return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; 356 } 357 358 *bandWidth = GetBandwidthEntry( 359 frameLength, 360 sampleRate, 361 chanBitRate, 362 entryNo); 363 364 if (*bandWidth==-1) { 365 ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE; 366 } 367 } 368 break; 369 default: 370 *bandWidth = 0; 371 return AAC_ENC_UNSUPPORTED_BITRATE_MODE; 372 } 373 374 *bandWidth = FDKmin(*bandWidth, sampleRate/2); 375 376 return ErrorStatus;; 377} 378