1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Frderung der angewandten 5 Forschung e.V. All rights reserved. 6 7 1. INTRODUCTION 8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software 9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding 10 scheme for digital audio. This FDK AAC Codec software is intended to be used on 11 a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient 14 general perceptual audio codecs. AAC-ELD is considered the best-performing 15 full-bandwidth communications codec by independent studies and is widely 16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG 17 specifications. 18 19 Patent licenses for necessary patent claims for the FDK AAC Codec (including 20 those of Fraunhofer) may be obtained through Via Licensing 21 (www.vialicensing.com) or through the respective patent owners individually for 22 the purpose of encoding or decoding bit streams in products that are compliant 23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of 24 Android devices already license these patent claims through Via Licensing or 25 directly from the patent owners, and therefore FDK AAC Codec software may 26 already be covered under those patent licenses when it is used for those 27 licensed purposes only. 28 29 Commercially-licensed AAC software libraries, including floating-point versions 30 with enhanced sound quality, are also available from Fraunhofer. Users are 31 encouraged to check the Fraunhofer website for additional applications 32 information and documentation. 33 34 2. COPYRIGHT LICENSE 35 36 Redistribution and use in source and binary forms, with or without modification, 37 are permitted without payment of copyright license fees provided that you 38 satisfy the following conditions: 39 40 You must retain the complete text of this software license in redistributions of 41 the FDK AAC Codec or your modifications thereto in source code form. 42 43 You must retain the complete text of this software license in the documentation 44 and/or other materials provided with redistributions of the FDK AAC Codec or 45 your modifications thereto in binary form. You must make available free of 46 charge copies of the complete source code of the FDK AAC Codec and your 47 modifications thereto to recipients of copies in binary form. 48 49 The name of Fraunhofer may not be used to endorse or promote products derived 50 from this library without prior written permission. 51 52 You may not charge copyright license fees for anyone to use, copy or distribute 53 the FDK AAC Codec software or your modifications thereto. 54 55 Your modified versions of the FDK AAC Codec must carry prominent notices stating 56 that you changed the software and the date of any change. For modified versions 57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" 58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK 59 AAC Codec Library for Android." 60 61 3. NO PATENT LICENSE 62 63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without 64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. 65 Fraunhofer provides no warranty of patent non-infringement with respect to this 66 software. 67 68 You may use this FDK AAC Codec software or modifications thereto only for 69 purposes that are authorized by appropriate patent licenses. 70 71 4. DISCLAIMER 72 73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright 74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, 75 including but not limited to the implied warranties of merchantability and 76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, 78 or consequential damages, including but not limited to procurement of substitute 79 goods or services; loss of use, data, or profits, or business interruption, 80 however caused and on any theory of liability, whether in contract, strict 81 liability, or tort (including negligence), arising in any way out of the use of 82 this software, even if advised of the possibility of such damage. 83 84 5. CONTACT INFORMATION 85 86 Fraunhofer Institute for Integrated Circuits IIS 87 Attention: Audio and Multimedia Departments - FDK AAC LL 88 Am Wolfsmantel 33 89 91058 Erlangen, Germany 90 91 www.iis.fraunhofer.de/amm 92 amm-info (at) iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /**************************** AAC encoder library ****************************** 96 97 Author(s): M.Lohwasser 98 99 Description: PNS parameters depending on bitrate and bandwidth 100 101 *******************************************************************************/ 102 103 #include "pnsparam.h" 104 105 #include "psy_configuration.h" 106 107 typedef struct { 108 SHORT startFreq; 109 /* Parameters for detection */ 110 FIXP_SGL refPower; 111 FIXP_SGL refTonality; 112 SHORT tnsGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */ 113 SHORT tnsPNSGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */ 114 FIXP_SGL gapFillThr; 115 SHORT minSfbWidth; 116 USHORT detectionAlgorithmFlags; 117 } PNS_INFO_TAB; 118 119 typedef struct { 120 ULONG brFrom; 121 ULONG brTo; 122 UCHAR S16000; 123 UCHAR S22050; 124 UCHAR S24000; 125 UCHAR S32000; 126 UCHAR S44100; 127 UCHAR S48000; 128 } AUTO_PNS_TAB; 129 130 static const AUTO_PNS_TAB levelTable_mono[] = { 131 { 132 0, 133 11999, 134 0, 135 1, 136 1, 137 1, 138 1, 139 1, 140 }, 141 { 142 12000, 143 19999, 144 0, 145 1, 146 1, 147 1, 148 1, 149 1, 150 }, 151 { 152 20000, 153 28999, 154 0, 155 2, 156 1, 157 1, 158 1, 159 1, 160 }, 161 { 162 29000, 163 40999, 164 0, 165 4, 166 4, 167 4, 168 2, 169 2, 170 }, 171 { 172 41000, 173 55999, 174 0, 175 9, 176 9, 177 7, 178 7, 179 7, 180 }, 181 { 182 56000, 183 61999, 184 0, 185 0, 186 0, 187 0, 188 9, 189 9, 190 }, 191 { 192 62000, 193 75999, 194 0, 195 0, 196 0, 197 0, 198 0, 199 0, 200 }, 201 { 202 76000, 203 92999, 204 0, 205 0, 206 0, 207 0, 208 0, 209 0, 210 }, 211 { 212 93000, 213 999999, 214 0, 215 0, 216 0, 217 0, 218 0, 219 0, 220 }, 221 }; 222 223 static const AUTO_PNS_TAB levelTable_stereo[] = { 224 { 225 0, 226 11999, 227 0, 228 1, 229 1, 230 1, 231 1, 232 1, 233 }, 234 { 235 12000, 236 19999, 237 0, 238 3, 239 1, 240 1, 241 1, 242 1, 243 }, 244 { 245 20000, 246 28999, 247 0, 248 3, 249 3, 250 3, 251 2, 252 2, 253 }, 254 { 255 29000, 256 40999, 257 0, 258 7, 259 6, 260 6, 261 5, 262 5, 263 }, 264 { 265 41000, 266 55999, 267 0, 268 9, 269 9, 270 7, 271 7, 272 7, 273 }, 274 { 275 56000, 276 79999, 277 0, 278 0, 279 0, 280 0, 281 0, 282 0, 283 }, 284 { 285 80000, 286 99999, 287 0, 288 0, 289 0, 290 0, 291 0, 292 0, 293 }, 294 { 295 100000, 296 999999, 297 0, 298 0, 299 0, 300 0, 301 0, 302 0, 303 }, 304 }; 305 306 static const PNS_INFO_TAB pnsInfoTab[] = { 307 /*0 pns off */ 308 /*1*/ {4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.06), 1150, 1200, 309 FL2FXCONST_SGL(0.02), 8, 310 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 311 USE_TNS_PNS /*| JUST_LONG_WINDOW*/}, 312 /*2*/ 313 {4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1130, 1300, 314 FL2FXCONST_SGL(0.05), 8, 315 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 316 USE_TNS_PNS /*| JUST_LONG_WINDOW*/}, 317 /*3*/ 318 {4100, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1100, 1400, 319 FL2FXCONST_SGL(0.10), 8, 320 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 321 USE_TNS_PNS /*| JUST_LONG_WINDOW*/}, 322 /*4*/ 323 {4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, 324 FL2FXCONST_SGL(0.15), 8, 325 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 326 USE_TNS_PNS /*| JUST_LONG_WINDOW*/}, 327 /*5*/ 328 {4300, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, 329 FL2FXCONST_SGL(0.15), 8, 330 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 331 USE_TNS_PNS | JUST_LONG_WINDOW}, 332 /*6*/ 333 {5000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, 334 FL2FXCONST_SGL(0.25), 8, 335 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 336 USE_TNS_PNS | JUST_LONG_WINDOW}, 337 /*7*/ 338 {5500, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1100, 1400, 339 FL2FXCONST_SGL(0.35), 8, 340 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 341 USE_TNS_PNS | JUST_LONG_WINDOW}, 342 /*8*/ 343 {6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1080, 1400, 344 FL2FXCONST_SGL(0.40), 8, 345 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 346 USE_TNS_PNS | JUST_LONG_WINDOW}, 347 /*9*/ 348 {6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.14), 1070, 1400, 349 FL2FXCONST_SGL(0.45), 8, 350 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 351 USE_TNS_PNS | JUST_LONG_WINDOW}, 352 }; 353 354 static const AUTO_PNS_TAB levelTable_lowComplexity[] = { 355 { 356 0, 357 27999, 358 0, 359 0, 360 0, 361 0, 362 0, 363 0, 364 }, 365 { 366 28000, 367 31999, 368 0, 369 2, 370 2, 371 2, 372 2, 373 2, 374 }, 375 { 376 32000, 377 47999, 378 0, 379 3, 380 3, 381 3, 382 3, 383 3, 384 }, 385 { 386 48000, 387 48000, 388 0, 389 4, 390 4, 391 4, 392 4, 393 4, 394 }, 395 { 396 48001, 397 999999, 398 0, 399 0, 400 0, 401 0, 402 0, 403 0, 404 }, 405 }; 406 /* conversion of old LC tuning tables to new (LD enc) structure (only entries 407 * which are actually used were converted) */ 408 static const PNS_INFO_TAB pnsInfoTab_lowComplexity[] = { 409 /*0 pns off */ 410 /* DEFAULT parameter set */ 411 /*1*/ {4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.16), 1100, 1400, 412 FL2FXCONST_SGL(0.5), 16, 413 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 414 USE_TNS_PNS | JUST_LONG_WINDOW}, 415 /*2*/ 416 {4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1410, 1400, 417 FL2FXCONST_SGL(0.5), 16, 418 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 419 USE_TNS_PNS | JUST_LONG_WINDOW}, 420 /*3*/ 421 {4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1100, 1400, 422 FL2FXCONST_SGL(0.5), 16, 423 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 424 USE_TNS_PNS | JUST_LONG_WINDOW}, 425 /* LOWSUBST -> PNS is used less often than with DEFAULT parameter set (for 426 br: 48000 - 79999) */ 427 /*4*/ 428 {4100, FL2FXCONST_SGL(0.20), FL2FXCONST_SGL(0.10), 1410, 1400, 429 FL2FXCONST_SGL(0.5), 16, 430 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | 431 USE_TNS_PNS | JUST_LONG_WINDOW}, 432 }; 433 434 /**************************************************************************** 435 function to look up used pns level 436 ****************************************************************************/ 437 int FDKaacEnc_lookUpPnsUse(int bitRate, int sampleRate, int numChan, 438 const int isLC) { 439 int hUsePns = 0, size, i; 440 const AUTO_PNS_TAB *levelTable; 441 442 if (isLC) { 443 levelTable = &levelTable_lowComplexity[0]; 444 size = sizeof(levelTable_lowComplexity); 445 } else { /* (E)LD */ 446 levelTable = (numChan > 1) ? &levelTable_stereo[0] : &levelTable_mono[0]; 447 size = (numChan > 1) ? sizeof(levelTable_stereo) : sizeof(levelTable_mono); 448 } 449 450 for (i = 0; i < (int)(size / sizeof(AUTO_PNS_TAB)); i++) { 451 if (((ULONG)bitRate >= levelTable[i].brFrom) && 452 ((ULONG)bitRate <= levelTable[i].brTo)) 453 break; 454 } 455 456 /* sanity check */ 457 if ((int)(sizeof(pnsInfoTab) / sizeof(PNS_INFO_TAB)) < i) { 458 return (PNS_TABLE_ERROR); 459 } 460 461 switch (sampleRate) { 462 case 16000: 463 hUsePns = levelTable[i].S16000; 464 break; 465 case 22050: 466 hUsePns = levelTable[i].S22050; 467 break; 468 case 24000: 469 hUsePns = levelTable[i].S24000; 470 break; 471 case 32000: 472 hUsePns = levelTable[i].S32000; 473 break; 474 case 44100: 475 hUsePns = levelTable[i].S44100; 476 break; 477 case 48000: 478 hUsePns = levelTable[i].S48000; 479 break; 480 default: 481 if (isLC) { 482 hUsePns = levelTable[i].S48000; 483 } 484 break; 485 } 486 487 return (hUsePns); 488 } 489 490 /***************************************************************************** 491 492 functionname: FDKaacEnc_GetPnsParam 493 description: Gets PNS parameters depending on bitrate and bandwidth or 494 bitsPerLine 495 returns: error status 496 input: Noiseparams struct, bitrate, sampling rate, 497 number of sfb's, pointer to sfb offset 498 output: PNS parameters 499 500 *****************************************************************************/ 501 AAC_ENCODER_ERROR FDKaacEnc_GetPnsParam(NOISEPARAMS *np, INT bitRate, 502 INT sampleRate, INT sfbCnt, 503 const INT *sfbOffset, INT *usePns, 504 INT numChan, const INT isLC) { 505 int i, hUsePns; 506 const PNS_INFO_TAB *pnsInfo; 507 508 if (*usePns <= 0) return AAC_ENC_OK; 509 510 if (isLC) { 511 np->detectionAlgorithmFlags = IS_LOW_COMPLEXITY; 512 513 pnsInfo = pnsInfoTab_lowComplexity; 514 515 /* new pns params */ 516 hUsePns = FDKaacEnc_lookUpPnsUse(bitRate, sampleRate, numChan, isLC); 517 if (hUsePns == 0) { 518 *usePns = 0; 519 return AAC_ENC_OK; 520 } 521 522 if (hUsePns == PNS_TABLE_ERROR) { 523 return AAC_ENC_PNS_TABLE_ERROR; 524 } 525 526 /* select correct row of tuning table */ 527 pnsInfo += hUsePns - 1; 528 529 } else { 530 np->detectionAlgorithmFlags = 0; 531 pnsInfo = pnsInfoTab; 532 533 /* new pns params */ 534 hUsePns = FDKaacEnc_lookUpPnsUse(bitRate, sampleRate, numChan, isLC); 535 if (hUsePns == 0) { 536 *usePns = 0; 537 return AAC_ENC_OK; 538 } 539 if (hUsePns == PNS_TABLE_ERROR) return AAC_ENC_PNS_TABLE_ERROR; 540 541 /* select correct row of tuning table */ 542 pnsInfo += hUsePns - 1; 543 } 544 545 np->startSfb = FDKaacEnc_FreqToBandWidthRounding( 546 pnsInfo->startFreq, sampleRate, sfbCnt, sfbOffset); 547 548 np->detectionAlgorithmFlags |= pnsInfo->detectionAlgorithmFlags; 549 550 np->refPower = FX_SGL2FX_DBL(pnsInfo->refPower); 551 np->refTonality = FX_SGL2FX_DBL(pnsInfo->refTonality); 552 np->tnsGainThreshold = pnsInfo->tnsGainThreshold; 553 np->tnsPNSGainThreshold = pnsInfo->tnsPNSGainThreshold; 554 np->minSfbWidth = pnsInfo->minSfbWidth; 555 556 np->gapFillThr = 557 pnsInfo->gapFillThr; /* for LC it is always FL2FXCONST_SGL(0.5) */ 558 559 /* assuming a constant dB/Hz slope in the signal's PSD curve, 560 the detection threshold needs to be corrected for the width of the band */ 561 562 for (i = 0; i < (sfbCnt - 1); i++) { 563 INT qtmp, sfbWidth; 564 FIXP_DBL tmp; 565 566 sfbWidth = sfbOffset[i + 1] - sfbOffset[i]; 567 568 tmp = fPow(np->refPower, 0, sfbWidth, DFRACT_BITS - 1 - 5, &qtmp); 569 np->powDistPSDcurve[i] = (FIXP_SGL)((LONG)(scaleValue(tmp, qtmp) >> 16)); 570 } 571 np->powDistPSDcurve[sfbCnt] = np->powDistPSDcurve[sfbCnt - 1]; 572 573 return AAC_ENC_OK; 574 } 575
