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/************************* 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 1024: 208 pBwTab = bandWidthTable; 209 bwTabSize = sizeof(bandWidthTable)/sizeof(BANDWIDTH_TAB); 210 break; 211 case 480: 212 case 512: 213 switch (sampleRate) { 214 case 8000: 215 case 11025: 216 case 12000: 217 case 16000: 218 case 22050: 219 pBwTab = bandWidthTable_LD_22050; 220 bwTabSize = sizeof(bandWidthTable_LD_22050)/sizeof(BANDWIDTH_TAB); 221 break; 222 case 24000: 223 pBwTab = bandWidthTable_LD_24000; 224 bwTabSize = sizeof(bandWidthTable_LD_24000)/sizeof(BANDWIDTH_TAB); 225 break; 226 case 32000: 227 pBwTab = bandWidthTable_LD_32000; 228 bwTabSize = sizeof(bandWidthTable_LD_32000)/sizeof(BANDWIDTH_TAB); 229 break; 230 case (44100): 231 pBwTab = bandWidthTable_LD_44100; 232 bwTabSize = sizeof(bandWidthTable_LD_44100)/sizeof(BANDWIDTH_TAB); 233 break; 234 case 48000: 235 case 64000: 236 case 88200: 237 case 96000: 238 pBwTab = bandWidthTable_LD_48000; 239 bwTabSize = sizeof(bandWidthTable_LD_48000)/sizeof(BANDWIDTH_TAB); 240 break; 241 } 242 break; 243 default: 244 pBwTab = NULL; 245 bwTabSize = 0; 246 } 247 248 if (pBwTab!=NULL) { 249 int i; 250 for (i=0; i<bwTabSize-1; i++) { 251 if (chanBitRate >= pBwTab[i].chanBitRate && 252 chanBitRate < pBwTab[i+1].chanBitRate) 253 { 254 switch (frameLength) { 255 case 1024: 256 bandwidth = (entryNo==0) 257 ? pBwTab[i].bandWidthMono 258 : pBwTab[i].bandWidth2AndMoreChan; 259 break; 260 case 480: 261 case 512: 262 { 263 INT q_res = 0; 264 INT startBw = (entryNo==0) ? pBwTab[i ].bandWidthMono : pBwTab[i ].bandWidth2AndMoreChan; 265 INT endBw = (entryNo==0) ? pBwTab[i+1].bandWidthMono : pBwTab[i+1].bandWidth2AndMoreChan; 266 INT startBr = pBwTab[i].chanBitRate; 267 INT endBr = pBwTab[i+1].chanBitRate; 268 269 FIXP_DBL bwFac_fix = fDivNorm(chanBitRate-startBr, endBr-startBr, &q_res); 270 bandwidth = (INT)scaleValue(fMult(bwFac_fix, (FIXP_DBL)(endBw-startBw)),q_res) + startBw; 271 } 272 break; 273 default: 274 bandwidth = -1; 275 } 276 break; 277 } /* within bitrate range */ 278 } 279 } /* pBwTab!=NULL */ 280 281 return bandwidth; 282} 283 284 285AAC_ENCODER_ERROR FDKaacEnc_DetermineBandWidth(INT* bandWidth, 286 INT proposedBandWidth, 287 INT bitrate, 288 AACENC_BITRATE_MODE bitrateMode, 289 INT sampleRate, 290 INT frameLength, 291 CHANNEL_MAPPING* cm, 292 CHANNEL_MODE encoderMode) 293{ 294 AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK; 295 INT chanBitRate = bitrate/cm->nChannels; 296 297 /* vbr */ 298 switch(bitrateMode){ 299 case AACENC_BR_MODE_VBR_1: 300 case AACENC_BR_MODE_VBR_2: 301 case AACENC_BR_MODE_VBR_3: 302 case AACENC_BR_MODE_VBR_4: 303 case AACENC_BR_MODE_VBR_5: 304 if (proposedBandWidth != 0){ 305 /* use given bw */ 306 *bandWidth = proposedBandWidth; 307 } else { 308 /* take bw from table */ 309 switch(encoderMode){ 310 case MODE_1: 311 *bandWidth = bandWidthTableVBR[bitrateMode].bandWidthMono; 312 break; 313 case MODE_2: 314 case MODE_1_2: 315 case MODE_1_2_1: 316 case MODE_1_2_2: 317 case MODE_1_2_2_1: 318 case MODE_1_2_2_2_1: 319 case MODE_7_1_REAR_SURROUND: 320 case MODE_7_1_FRONT_CENTER: 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 case MODE_7_1_REAR_SURROUND: 352 case MODE_7_1_FRONT_CENTER: 353 entryNo = 1; /* use stereo bandwith settings */ 354 break; 355 356 default: 357 return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; 358 } 359 360 *bandWidth = GetBandwidthEntry( 361 frameLength, 362 sampleRate, 363 chanBitRate, 364 entryNo); 365 366 if (*bandWidth==-1) { 367 ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE; 368 } 369 } 370 break; 371 default: 372 *bandWidth = 0; 373 return AAC_ENC_UNSUPPORTED_BITRATE_MODE; 374 } 375 376 *bandWidth = FDKmin(*bandWidth, sampleRate/2); 377 378 return ErrorStatus;; 379} 380