1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Frderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16 of the MPEG specifications. 17 18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20 individually for the purpose of encoding or decoding bit streams in products that are compliant with 21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23 software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27 applications information and documentation. 28 29 2. COPYRIGHT LICENSE 30 31 Redistribution and use in source and binary forms, with or without modification, are permitted without 32 payment of copyright license fees provided that you satisfy the following conditions: 33 34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35 your modifications thereto in source code form. 36 37 You must retain the complete text of this software license in the documentation and/or other materials 38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40 modifications thereto to recipients of copies in binary form. 41 42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43 prior written permission. 44 45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46 software or your modifications thereto. 47 48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49 and 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 53 3. NO PATENT LICENSE 54 55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57 respect to this software. 58 59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60 by appropriate patent licenses. 61 62 4. DISCLAIMER 63 64 This 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 66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69 or business interruption, however caused and on any theory of liability, whether in contract, strict 70 liability, or tort (including negligence), arising in any way out of the use of this software, even if 71 advised of the possibility of such damage. 72 73 5. CONTACT INFORMATION 74 75 Fraunhofer Institute for Integrated Circuits IIS 76 Attention: Audio and Multimedia Departments - FDK AAC LL 77 Am Wolfsmantel 33 78 91058 Erlangen, Germany 79 80 www.iis.fraunhofer.de/amm 81 amm-info (at) iis.fraunhofer.de 82 ----------------------------------------------------------------------------------------------------------- */ 83 84 /******************************** MPEG Audio Encoder ************************** 85 86 Initial author: M. Werner 87 contents/description: Scale factor estimation 88 89 ******************************************************************************/ 90 91 #include "sf_estim.h" 92 #include "aacEnc_rom.h" 93 #include "quantize.h" 94 #include "bit_cnt.h" 95 96 97 98 99 #define AS_PE_FAC_SHIFT 7 100 #define DIST_FAC_SHIFT 3 101 #define AS_PE_FAC_FLOAT (float)(1 << AS_PE_FAC_SHIFT) 102 static const INT MAX_SCF_DELTA = 60; 103 104 105 static const FIXP_DBL PE_C1 = FL2FXCONST_DBL(3.0f/AS_PE_FAC_FLOAT); /* (log(8.0)/log(2)) >> AS_PE_FAC_SHIFT */ 106 static const FIXP_DBL PE_C2 = FL2FXCONST_DBL(1.3219281f/AS_PE_FAC_FLOAT); /* (log(2.5)/log(2)) >> AS_PE_FAC_SHIFT */ 107 static const FIXP_DBL PE_C3 = FL2FXCONST_DBL(0.5593573f); /* 1-C2/C1 */ 108 109 110 /* 111 Function; FDKaacEnc_FDKaacEnc_CalcFormFactorChannel 112 113 Description: Calculates the formfactor 114 115 sf: scale factor of the mdct spectrum 116 sfbFormFactorLdData is scaled with the factor 1/(((2^sf)^0.5) * (2^FORM_FAC_SHIFT)) 117 */ 118 static void 119 FDKaacEnc_FDKaacEnc_CalcFormFactorChannel(FIXP_DBL *RESTRICT sfbFormFactorLdData, 120 PSY_OUT_CHANNEL *RESTRICT psyOutChan) 121 { 122 INT j, sfb, sfbGrp; 123 FIXP_DBL formFactor; 124 125 int tmp0 = psyOutChan->sfbCnt; 126 int tmp1 = psyOutChan->maxSfbPerGroup; 127 int step = psyOutChan->sfbPerGroup; 128 for(sfbGrp = 0; sfbGrp < tmp0; sfbGrp += step) { 129 for (sfb = 0; sfb < tmp1; sfb++) { 130 formFactor = FL2FXCONST_DBL(0.0f); 131 /* calc sum of sqrt(spec) */ 132 for(j=psyOutChan->sfbOffsets[sfbGrp+sfb]; j<psyOutChan->sfbOffsets[sfbGrp+sfb+1]; j++ ) { 133 formFactor += sqrtFixp(fixp_abs(psyOutChan->mdctSpectrum[j]))>>FORM_FAC_SHIFT; 134 } 135 sfbFormFactorLdData[sfbGrp+sfb] = CalcLdData(formFactor); 136 } 137 /* set sfbFormFactor for sfbs with zero spec to zero. Just for debugging. */ 138 for ( ; sfb < psyOutChan->sfbPerGroup; sfb++) { 139 sfbFormFactorLdData[sfbGrp+sfb] = FL2FXCONST_DBL(-1.0f); 140 } 141 } 142 } 143 144 /* 145 Function: FDKaacEnc_CalcFormFactor 146 147 Description: Calls FDKaacEnc_FDKaacEnc_CalcFormFactorChannel() for each channel 148 */ 149 150 void 151 FDKaacEnc_CalcFormFactor(QC_OUT_CHANNEL *qcOutChannel[(2)], 152 PSY_OUT_CHANNEL *psyOutChannel[(2)], 153 const INT nChannels) 154 { 155 INT j; 156 for (j=0; j<nChannels; j++) { 157 FDKaacEnc_FDKaacEnc_CalcFormFactorChannel(qcOutChannel[j]->sfbFormFactorLdData, psyOutChannel[j]); 158 } 159 } 160 161 /* 162 Function: FDKaacEnc_calcSfbRelevantLines 163 164 Description: Calculates sfbNRelevantLines 165 166 sfbNRelevantLines is scaled with the factor 1/((2^FORM_FAC_SHIFT) * 2.0) 167 */ 168 static void 169 FDKaacEnc_calcSfbRelevantLines( const FIXP_DBL *const sfbFormFactorLdData, 170 const FIXP_DBL *const sfbEnergyLdData, 171 const FIXP_DBL *const sfbThresholdLdData, 172 const INT *const sfbOffsets, 173 const INT sfbCnt, 174 const INT sfbPerGroup, 175 const INT maxSfbPerGroup, 176 FIXP_DBL *sfbNRelevantLines) 177 { 178 INT sfbOffs, sfb; 179 FIXP_DBL sfbWidthLdData; 180 FIXP_DBL asPeFacLdData = FL2FXCONST_DBL(0.109375); /* AS_PE_FAC_SHIFT*ld64(2) */ 181 FIXP_DBL accu; 182 183 /* sfbNRelevantLines[i] = 2^( (sfbFormFactorLdData[i] - 0.25 * (sfbEnergyLdData[i] - ld64(sfbWidth[i]/(2^7)) - AS_PE_FAC_SHIFT*ld64(2)) * 64); */ 184 185 FDKmemclear(sfbNRelevantLines, sfbCnt * sizeof(FIXP_DBL)); 186 187 for (sfbOffs=0; sfbOffs<sfbCnt; sfbOffs+=sfbPerGroup) { 188 for(sfb=0; sfb<maxSfbPerGroup; sfb++) { 189 /* calc sum of sqrt(spec) */ 190 if((FIXP_DBL)sfbEnergyLdData[sfbOffs+sfb] > (FIXP_DBL)sfbThresholdLdData[sfbOffs+sfb]) { 191 INT sfbWidth = sfbOffsets[sfbOffs+sfb+1] - sfbOffsets[sfbOffs+sfb]; 192 193 /* avgFormFactorLdData = sqrtFixp(sqrtFixp(sfbEnergyLdData[sfbOffs+sfb]/sfbWidth)); */ 194 /* sfbNRelevantLines[sfbOffs+sfb] = sfbFormFactor[sfbOffs+sfb] / avgFormFactorLdData; */ 195 sfbWidthLdData = (FIXP_DBL)(sfbWidth << (DFRACT_BITS-1-AS_PE_FAC_SHIFT)); 196 sfbWidthLdData = CalcLdData(sfbWidthLdData); 197 198 accu = sfbEnergyLdData[sfbOffs+sfb] - sfbWidthLdData - asPeFacLdData; 199 accu = sfbFormFactorLdData[sfbOffs+sfb] - (accu >> 2); 200 201 sfbNRelevantLines[sfbOffs+sfb] = CalcInvLdData(accu) >> 1; 202 } 203 } 204 } 205 } 206 207 /* 208 Function: FDKaacEnc_countSingleScfBits 209 210 Description: 211 212 scfBitsFract is scaled by 1/(2^(2*AS_PE_FAC_SHIFT)) 213 */ 214 static FIXP_DBL FDKaacEnc_countSingleScfBits(INT scf, INT scfLeft, INT scfRight) 215 { 216 FIXP_DBL scfBitsFract; 217 218 scfBitsFract = (FIXP_DBL) ( FDKaacEnc_bitCountScalefactorDelta(scfLeft-scf) 219 + FDKaacEnc_bitCountScalefactorDelta(scf-scfRight) ); 220 221 scfBitsFract = scfBitsFract << (DFRACT_BITS-1-(2*AS_PE_FAC_SHIFT)); 222 223 return scfBitsFract; /* output scaled by 1/(2^(2*AS_PE_FAC)) */ 224 } 225 226 /* 227 Function: FDKaacEnc_calcSingleSpecPe 228 229 specPe is scaled by 1/(2^(2*AS_PE_FAC_SHIFT)) 230 */ 231 static FIXP_DBL FDKaacEnc_calcSingleSpecPe(INT scf, FIXP_DBL sfbConstPePart, FIXP_DBL nLines) 232 { 233 FIXP_DBL specPe = FL2FXCONST_DBL(0.0f); 234 FIXP_DBL ldRatio; 235 FIXP_DBL scfFract; 236 237 scfFract = (FIXP_DBL)(scf << (DFRACT_BITS-1-AS_PE_FAC_SHIFT)); 238 239 ldRatio = sfbConstPePart - fMult(FL2FXCONST_DBL(0.375f),scfFract); 240 241 if (ldRatio >= PE_C1) { 242 specPe = fMult(FL2FXCONST_DBL(0.7f),fMult(nLines,ldRatio)); 243 } 244 else { 245 specPe = fMult(FL2FXCONST_DBL(0.7f),fMult(nLines,(PE_C2 + fMult(PE_C3,ldRatio)))); 246 } 247 248 return specPe; /* output scaled by 1/(2^(2*AS_PE_FAC)) */ 249 } 250 251 /* 252 Function: FDKaacEnc_countScfBitsDiff 253 254 scfBitsDiff is scaled by 1/(2^(2*AS_PE_FAC_SHIFT)) 255 */ 256 static FIXP_DBL FDKaacEnc_countScfBitsDiff(INT *scfOld, 257 INT *scfNew, 258 INT sfbCnt, 259 INT startSfb, 260 INT stopSfb) 261 { 262 FIXP_DBL scfBitsFract; 263 INT scfBitsDiff = 0; 264 INT sfb = 0, sfbLast; 265 INT sfbPrev, sfbNext; 266 267 /* search for first relevant sfb */ 268 sfbLast = startSfb; 269 while ((sfbLast<stopSfb) && (scfOld[sfbLast]==FDK_INT_MIN)) 270 sfbLast++; 271 /* search for previous relevant sfb and count diff */ 272 sfbPrev = startSfb - 1; 273 while ((sfbPrev>=0) && (scfOld[sfbPrev]==FDK_INT_MIN)) 274 sfbPrev--; 275 if (sfbPrev>=0) 276 scfBitsDiff += FDKaacEnc_bitCountScalefactorDelta(scfNew[sfbPrev]-scfNew[sfbLast]) - 277 FDKaacEnc_bitCountScalefactorDelta(scfOld[sfbPrev]-scfOld[sfbLast]); 278 /* now loop through all sfbs and count diffs of relevant sfbs */ 279 for (sfb=sfbLast+1; sfb<stopSfb; sfb++) { 280 if (scfOld[sfb]!=FDK_INT_MIN) { 281 scfBitsDiff += FDKaacEnc_bitCountScalefactorDelta(scfNew[sfbLast]-scfNew[sfb]) - 282 FDKaacEnc_bitCountScalefactorDelta(scfOld[sfbLast]-scfOld[sfb]); 283 sfbLast = sfb; 284 } 285 } 286 /* search for next relevant sfb and count diff */ 287 sfbNext = stopSfb; 288 while ((sfbNext<sfbCnt) && (scfOld[sfbNext]==FDK_INT_MIN)) 289 sfbNext++; 290 if (sfbNext<sfbCnt) 291 scfBitsDiff += FDKaacEnc_bitCountScalefactorDelta(scfNew[sfbLast]-scfNew[sfbNext]) - 292 FDKaacEnc_bitCountScalefactorDelta(scfOld[sfbLast]-scfOld[sfbNext]); 293 294 scfBitsFract = (FIXP_DBL) (scfBitsDiff << (DFRACT_BITS-1-(2*AS_PE_FAC_SHIFT))); 295 296 return scfBitsFract; 297 } 298 299 /* 300 Function: FDKaacEnc_calcSpecPeDiff 301 302 specPeDiff is scaled by 1/(2^(2*AS_PE_FAC_SHIFT)) 303 */ 304 static FIXP_DBL FDKaacEnc_calcSpecPeDiff(PSY_OUT_CHANNEL *psyOutChan, 305 QC_OUT_CHANNEL *qcOutChannel, 306 INT *scfOld, 307 INT *scfNew, 308 FIXP_DBL *sfbConstPePart, 309 FIXP_DBL *sfbFormFactorLdData, 310 FIXP_DBL *sfbNRelevantLines, 311 INT startSfb, 312 INT stopSfb) 313 { 314 FIXP_DBL specPeDiff = FL2FXCONST_DBL(0.0f); 315 FIXP_DBL scfFract = FL2FXCONST_DBL(0.0f); 316 INT sfb; 317 318 /* loop through all sfbs and count pe difference */ 319 for (sfb=startSfb; sfb<stopSfb; sfb++) { 320 if (scfOld[sfb]!=FDK_INT_MIN) { 321 FIXP_DBL ldRatioOld, ldRatioNew, pOld, pNew; 322 323 /* sfbConstPePart[sfb] = (float)log(psyOutChan->sfbEnergy[sfb] * 6.75f / sfbFormFactor[sfb]) * LOG2_1; */ 324 /* 0.02152255861f = log(6.75)/log(2)/AS_PE_FAC_FLOAT; LOG2_1 is 1.0 for log2 */ 325 /* 0.09375f = log(64.0)/log(2.0)/64.0 = scale of sfbFormFactorLdData */ 326 if (sfbConstPePart[sfb] == (FIXP_DBL)FDK_INT_MIN) 327 sfbConstPePart[sfb] = ((psyOutChan->sfbEnergyLdData[sfb] - sfbFormFactorLdData[sfb] - FL2FXCONST_DBL(0.09375f)) >> 1) + FL2FXCONST_DBL(0.02152255861f); 328 329 scfFract = (FIXP_DBL) (scfOld[sfb] << (DFRACT_BITS-1-AS_PE_FAC_SHIFT)); 330 ldRatioOld = sfbConstPePart[sfb] - fMult(FL2FXCONST_DBL(0.375f),scfFract); 331 332 scfFract = (FIXP_DBL) (scfNew[sfb] << (DFRACT_BITS-1-AS_PE_FAC_SHIFT)); 333 ldRatioNew = sfbConstPePart[sfb] - fMult(FL2FXCONST_DBL(0.375f),scfFract); 334 335 if (ldRatioOld >= PE_C1) 336 pOld = ldRatioOld; 337 else 338 pOld = PE_C2 + fMult(PE_C3,ldRatioOld); 339 340 if (ldRatioNew >= PE_C1) 341 pNew = ldRatioNew; 342 else 343 pNew = PE_C2 + fMult(PE_C3,ldRatioNew); 344 345 specPeDiff += fMult(FL2FXCONST_DBL(0.7f),fMult(sfbNRelevantLines[sfb],(pNew - pOld))); 346 } 347 } 348 349 return specPeDiff; 350 } 351 352 /* 353 Function: FDKaacEnc_improveScf 354 355 Description: Calculate the distortion by quantization and inverse quantization of the spectrum with 356 various scalefactors. The scalefactor which provides the best results will be used. 357 */ 358 static INT FDKaacEnc_improveScf(FIXP_DBL *spec, 359 SHORT *quantSpec, 360 SHORT *quantSpecTmp, 361 INT sfbWidth, 362 FIXP_DBL threshLdData, 363 INT scf, 364 INT minScf, 365 FIXP_DBL *distLdData, 366 INT *minScfCalculated 367 ) 368 { 369 FIXP_DBL sfbDistLdData; 370 INT scfBest = scf; 371 INT k; 372 FIXP_DBL distFactorLdData = FL2FXCONST_DBL(-0.0050301265); /* ld64(1/1.25) */ 373 374 /* calc real distortion */ 375 sfbDistLdData = FDKaacEnc_calcSfbDist(spec, 376 quantSpec, 377 sfbWidth, 378 scf); 379 *minScfCalculated = scf; 380 /* nmr > 1.25 -> try to improve nmr */ 381 if (sfbDistLdData > (threshLdData-distFactorLdData)) { 382 INT scfEstimated = scf; 383 FIXP_DBL sfbDistBestLdData = sfbDistLdData; 384 INT cnt; 385 /* improve by bigger scf ? */ 386 cnt = 0; 387 388 while ((sfbDistLdData > (threshLdData-distFactorLdData)) && (cnt++ < 3)) { 389 scf++; 390 sfbDistLdData = FDKaacEnc_calcSfbDist(spec, 391 quantSpecTmp, 392 sfbWidth, 393 scf); 394 395 if (sfbDistLdData < sfbDistBestLdData) { 396 scfBest = scf; 397 sfbDistBestLdData = sfbDistLdData; 398 for (k=0; k<sfbWidth; k++) 399 quantSpec[k] = quantSpecTmp[k]; 400 } 401 } 402 /* improve by smaller scf ? */ 403 cnt = 0; 404 scf = scfEstimated; 405 sfbDistLdData = sfbDistBestLdData; 406 while ((sfbDistLdData > (threshLdData-distFactorLdData)) && (cnt++ < 1) && (scf > minScf)) { 407 scf--; 408 sfbDistLdData = FDKaacEnc_calcSfbDist(spec, 409 quantSpecTmp, 410 sfbWidth, 411 scf); 412 413 if (sfbDistLdData < sfbDistBestLdData) { 414 scfBest = scf; 415 sfbDistBestLdData = sfbDistLdData; 416 for (k=0; k<sfbWidth; k++) 417 quantSpec[k] = quantSpecTmp[k]; 418 } 419 *minScfCalculated = scf; 420 } 421 *distLdData = sfbDistBestLdData; 422 } 423 else { /* nmr <= 1.25 -> try to find bigger scf to use less bits */ 424 FIXP_DBL sfbDistBestLdData = sfbDistLdData; 425 FIXP_DBL sfbDistAllowedLdData = fixMin(sfbDistLdData-distFactorLdData,threshLdData); 426 int cnt; 427 for (cnt=0; cnt<3; cnt++) { 428 scf++; 429 sfbDistLdData = FDKaacEnc_calcSfbDist(spec, 430 quantSpecTmp, 431 sfbWidth, 432 scf); 433 434 if (sfbDistLdData < sfbDistAllowedLdData) { 435 *minScfCalculated = scfBest+1; 436 scfBest = scf; 437 sfbDistBestLdData = sfbDistLdData; 438 for (k=0; k<sfbWidth; k++) 439 quantSpec[k] = quantSpecTmp[k]; 440 } 441 } 442 *distLdData = sfbDistBestLdData; 443 } 444 445 /* return best scalefactor */ 446 return scfBest; 447 } 448 449 /* 450 Function: FDKaacEnc_assimilateSingleScf 451 452 */ 453 static void FDKaacEnc_assimilateSingleScf(PSY_OUT_CHANNEL *psyOutChan, 454 QC_OUT_CHANNEL *qcOutChannel, 455 SHORT *quantSpec, 456 SHORT *quantSpecTmp, 457 INT *scf, 458 INT *minScf, 459 FIXP_DBL *sfbDist, 460 FIXP_DBL *sfbConstPePart, 461 FIXP_DBL *sfbFormFactorLdData, 462 FIXP_DBL *sfbNRelevantLines, 463 INT *minScfCalculated, 464 INT restartOnSuccess) 465 { 466 INT sfbLast, sfbAct, sfbNext; 467 INT scfAct, *scfLast, *scfNext, scfMin, scfMax; 468 INT sfbWidth, sfbOffs; 469 FIXP_DBL enLdData; 470 FIXP_DBL sfbPeOld, sfbPeNew; 471 FIXP_DBL sfbDistNew; 472 INT i, k; 473 INT success = 0; 474 FIXP_DBL deltaPe = FL2FXCONST_DBL(0.0f); 475 FIXP_DBL deltaPeNew, deltaPeTmp; 476 INT prevScfLast[MAX_GROUPED_SFB], prevScfNext[MAX_GROUPED_SFB]; 477 FIXP_DBL deltaPeLast[MAX_GROUPED_SFB]; 478 INT updateMinScfCalculated; 479 480 for (i=0; i<psyOutChan->sfbCnt; i++) { 481 prevScfLast[i] = FDK_INT_MAX; 482 prevScfNext[i] = FDK_INT_MAX; 483 deltaPeLast[i] = (FIXP_DBL)FDK_INT_MAX; 484 } 485 486 sfbLast = -1; 487 sfbAct = -1; 488 sfbNext = -1; 489 scfLast = 0; 490 scfNext = 0; 491 scfMin = FDK_INT_MAX; 492 scfMax = FDK_INT_MAX; 493 do { 494 /* search for new relevant sfb */ 495 sfbNext++; 496 while ((sfbNext < psyOutChan->sfbCnt) && (scf[sfbNext] == FDK_INT_MIN)) 497 sfbNext++; 498 if ((sfbLast>=0) && (sfbAct>=0) && (sfbNext<psyOutChan->sfbCnt)) { 499 /* relevant scfs to the left and to the right */ 500 scfAct = scf[sfbAct]; 501 scfLast = scf + sfbLast; 502 scfNext = scf + sfbNext; 503 scfMin = fixMin(*scfLast, *scfNext); 504 scfMax = fixMax(*scfLast, *scfNext); 505 } 506 else if ((sfbLast==-1) && (sfbAct>=0) && (sfbNext<psyOutChan->sfbCnt)) { 507 /* first relevant scf */ 508 scfAct = scf[sfbAct]; 509 scfLast = &scfAct; 510 scfNext = scf + sfbNext; 511 scfMin = *scfNext; 512 scfMax = *scfNext; 513 } 514 else if ((sfbLast>=0) && (sfbAct>=0) && (sfbNext==psyOutChan->sfbCnt)) { 515 /* last relevant scf */ 516 scfAct = scf[sfbAct]; 517 scfLast = scf + sfbLast; 518 scfNext = &scfAct; 519 scfMin = *scfLast; 520 scfMax = *scfLast; 521 } 522 if (sfbAct>=0) 523 scfMin = fixMax(scfMin, minScf[sfbAct]); 524 525 if ((sfbAct >= 0) && 526 (sfbLast>=0 || sfbNext<psyOutChan->sfbCnt) && 527 (scfAct > scfMin) && 528 (scfAct <= scfMin+MAX_SCF_DELTA) && 529 (scfAct >= scfMax-MAX_SCF_DELTA) && 530 (*scfLast != prevScfLast[sfbAct] || 531 *scfNext != prevScfNext[sfbAct] || 532 deltaPe < deltaPeLast[sfbAct])) { 533 /* bigger than neighbouring scf found, try to use smaller scf */ 534 success = 0; 535 536 sfbWidth = psyOutChan->sfbOffsets[sfbAct+1] - psyOutChan->sfbOffsets[sfbAct]; 537 sfbOffs = psyOutChan->sfbOffsets[sfbAct]; 538 539 /* estimate required bits for actual scf */ 540 enLdData = qcOutChannel->sfbEnergyLdData[sfbAct]; 541 542 /* sfbConstPePart[sfbAct] = (float)log(6.75f*en/sfbFormFactor[sfbAct]) * LOG2_1; */ 543 /* 0.02152255861f = log(6.75)/log(2)/AS_PE_FAC_FLOAT; LOG2_1 is 1.0 for log2 */ 544 /* 0.09375f = log(64.0)/log(2.0)/64.0 = scale of sfbFormFactorLdData */ 545 if (sfbConstPePart[sfbAct] == (FIXP_DBL)FDK_INT_MIN) { 546 sfbConstPePart[sfbAct] = ((enLdData - sfbFormFactorLdData[sfbAct] - FL2FXCONST_DBL(0.09375f)) >> 1) + FL2FXCONST_DBL(0.02152255861f); 547 } 548 549 sfbPeOld = FDKaacEnc_calcSingleSpecPe(scfAct,sfbConstPePart[sfbAct],sfbNRelevantLines[sfbAct]) 550 +FDKaacEnc_countSingleScfBits(scfAct, *scfLast, *scfNext); 551 552 deltaPeNew = deltaPe; 553 updateMinScfCalculated = 1; 554 555 do { 556 /* estimate required bits for smaller scf */ 557 scfAct--; 558 /* check only if the same check was not done before */ 559 if (scfAct < minScfCalculated[sfbAct] && scfAct>=scfMax-MAX_SCF_DELTA){ 560 /* estimate required bits for new scf */ 561 sfbPeNew = FDKaacEnc_calcSingleSpecPe(scfAct,sfbConstPePart[sfbAct],sfbNRelevantLines[sfbAct]) 562 +FDKaacEnc_countSingleScfBits(scfAct,*scfLast, *scfNext); 563 564 /* use new scf if no increase in pe and 565 quantization error is smaller */ 566 deltaPeTmp = deltaPe + sfbPeNew - sfbPeOld; 567 /* 0.0006103515625f = 10.0f/(2^(2*AS_PE_FAC_SHIFT)) */ 568 if (deltaPeTmp < FL2FXCONST_DBL(0.0006103515625f)) { 569 /* distortion of new scf */ 570 sfbDistNew = FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+sfbOffs, 571 quantSpecTmp+sfbOffs, 572 sfbWidth, 573 scfAct); 574 575 if (sfbDistNew < sfbDist[sfbAct]) { 576 /* success, replace scf by new one */ 577 scf[sfbAct] = scfAct; 578 sfbDist[sfbAct] = sfbDistNew; 579 580 for (k=0; k<sfbWidth; k++) 581 quantSpec[sfbOffs+k] = quantSpecTmp[sfbOffs+k]; 582 583 deltaPeNew = deltaPeTmp; 584 success = 1; 585 } 586 /* mark as already checked */ 587 if (updateMinScfCalculated) 588 minScfCalculated[sfbAct] = scfAct; 589 } 590 else { 591 /* from this scf value on not all new values have been checked */ 592 updateMinScfCalculated = 0; 593 } 594 } 595 } while (scfAct > scfMin); 596 597 deltaPe = deltaPeNew; 598 599 /* save parameters to avoid multiple computations of the same sfb */ 600 prevScfLast[sfbAct] = *scfLast; 601 prevScfNext[sfbAct] = *scfNext; 602 deltaPeLast[sfbAct] = deltaPe; 603 } 604 605 if (success && restartOnSuccess) { 606 /* start again at first sfb */ 607 sfbLast = -1; 608 sfbAct = -1; 609 sfbNext = -1; 610 scfLast = 0; 611 scfNext = 0; 612 scfMin = FDK_INT_MAX; 613 scfMax = FDK_INT_MAX; 614 success = 0; 615 } 616 else { 617 /* shift sfbs for next band */ 618 sfbLast = sfbAct; 619 sfbAct = sfbNext; 620 } 621 } while (sfbNext < psyOutChan->sfbCnt); 622 } 623 624 /* 625 Function: FDKaacEnc_assimilateMultipleScf 626 627 */ 628 static void FDKaacEnc_assimilateMultipleScf(PSY_OUT_CHANNEL *psyOutChan, 629 QC_OUT_CHANNEL *qcOutChannel, 630 SHORT *quantSpec, 631 SHORT *quantSpecTmp, 632 INT *scf, 633 INT *minScf, 634 FIXP_DBL *sfbDist, 635 FIXP_DBL *sfbConstPePart, 636 FIXP_DBL *sfbFormFactorLdData, 637 FIXP_DBL *sfbNRelevantLines) 638 { 639 INT sfb, startSfb, stopSfb; 640 INT scfTmp[MAX_GROUPED_SFB], scfMin, scfMax, scfAct; 641 INT possibleRegionFound; 642 INT sfbWidth, sfbOffs, i, k; 643 FIXP_DBL sfbDistNew[MAX_GROUPED_SFB], distOldSum, distNewSum; 644 INT deltaScfBits; 645 FIXP_DBL deltaSpecPe; 646 FIXP_DBL deltaPe = FL2FXCONST_DBL(0.0f); 647 FIXP_DBL deltaPeNew; 648 INT sfbCnt = psyOutChan->sfbCnt; 649 650 /* calc min and max scalfactors */ 651 scfMin = FDK_INT_MAX; 652 scfMax = FDK_INT_MIN; 653 for (sfb=0; sfb<sfbCnt; sfb++) { 654 if (scf[sfb]!=FDK_INT_MIN) { 655 scfMin = fixMin(scfMin, scf[sfb]); 656 scfMax = fixMax(scfMax, scf[sfb]); 657 } 658 } 659 660 if (scfMax != FDK_INT_MIN && scfMax <= scfMin+MAX_SCF_DELTA) { 661 662 scfAct = scfMax; 663 664 do { 665 /* try smaller scf */ 666 scfAct--; 667 for (i=0; i<MAX_GROUPED_SFB; i++) 668 scfTmp[i] = scf[i]; 669 stopSfb = 0; 670 do { 671 /* search for region where all scfs are bigger than scfAct */ 672 sfb = stopSfb; 673 while (sfb<sfbCnt && (scf[sfb]==FDK_INT_MIN || scf[sfb] <= scfAct)) 674 sfb++; 675 startSfb = sfb; 676 sfb++; 677 while (sfb<sfbCnt && (scf[sfb]==FDK_INT_MIN || scf[sfb] > scfAct)) 678 sfb++; 679 stopSfb = sfb; 680 681 /* check if in all sfb of a valid region scfAct >= minScf[sfb] */ 682 possibleRegionFound = 0; 683 if (startSfb < sfbCnt) { 684 possibleRegionFound = 1; 685 for (sfb=startSfb; sfb<stopSfb; sfb++) { 686 if (scf[sfb] != FDK_INT_MIN) 687 if (scfAct < minScf[sfb]) { 688 possibleRegionFound = 0; 689 break; 690 } 691 } 692 } 693 694 if (possibleRegionFound) { /* region found */ 695 696 /* replace scfs in region by scfAct */ 697 for (sfb=startSfb; sfb<stopSfb; sfb++) { 698 if (scfTmp[sfb] != FDK_INT_MIN) 699 scfTmp[sfb] = scfAct; 700 } 701 702 /* estimate change in bit demand for new scfs */ 703 deltaScfBits = FDKaacEnc_countScfBitsDiff(scf,scfTmp,sfbCnt,startSfb,stopSfb); 704 705 deltaSpecPe = FDKaacEnc_calcSpecPeDiff(psyOutChan, qcOutChannel, scf, scfTmp, sfbConstPePart, 706 sfbFormFactorLdData, sfbNRelevantLines, 707 startSfb, stopSfb); 708 709 deltaPeNew = deltaPe + (FIXP_DBL)deltaScfBits + deltaSpecPe; 710 711 /* new bit demand small enough ? */ 712 /* 0.0006103515625f = 10.0f/(2^(2*AS_PE_FAC_SHIFT)) */ 713 if (deltaPeNew < FL2FXCONST_DBL(0.0006103515625f)) { 714 715 /* quantize and calc sum of new distortion */ 716 distOldSum = distNewSum = FL2FXCONST_DBL(0.0f); 717 for (sfb=startSfb; sfb<stopSfb; sfb++) { 718 if (scfTmp[sfb] != FDK_INT_MIN) { 719 distOldSum += CalcInvLdData(sfbDist[sfb]) >> DIST_FAC_SHIFT; 720 721 sfbWidth = psyOutChan->sfbOffsets[sfb+1] - psyOutChan->sfbOffsets[sfb]; 722 sfbOffs = psyOutChan->sfbOffsets[sfb]; 723 724 sfbDistNew[sfb] = FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+sfbOffs, 725 quantSpecTmp+sfbOffs, 726 sfbWidth, 727 scfAct); 728 729 if (sfbDistNew[sfb] >qcOutChannel->sfbThresholdLdData[sfb]) { 730 /* no improvement, skip further dist. calculations */ 731 distNewSum = distOldSum << 1; 732 break; 733 } 734 distNewSum += CalcInvLdData(sfbDistNew[sfb]) >> DIST_FAC_SHIFT; 735 } 736 } 737 /* distortion smaller ? -> use new scalefactors */ 738 if (distNewSum < distOldSum) { 739 deltaPe = deltaPeNew; 740 for (sfb=startSfb; sfb<stopSfb; sfb++) { 741 if (scf[sfb] != FDK_INT_MIN) { 742 sfbWidth = psyOutChan->sfbOffsets[sfb+1] - 743 psyOutChan->sfbOffsets[sfb]; 744 sfbOffs = psyOutChan->sfbOffsets[sfb]; 745 scf[sfb] = scfAct; 746 sfbDist[sfb] = sfbDistNew[sfb]; 747 748 for (k=0; k<sfbWidth; k++) 749 quantSpec[sfbOffs+k] = quantSpecTmp[sfbOffs+k]; 750 } 751 } 752 } 753 754 } 755 } 756 757 } while (stopSfb <= sfbCnt); 758 759 } while (scfAct > scfMin); 760 } 761 } 762 763 /* 764 Function: FDKaacEnc_FDKaacEnc_assimilateMultipleScf2 765 766 */ 767 static void FDKaacEnc_FDKaacEnc_assimilateMultipleScf2(PSY_OUT_CHANNEL *psyOutChan, 768 QC_OUT_CHANNEL *qcOutChannel, 769 SHORT *quantSpec, 770 SHORT *quantSpecTmp, 771 INT *scf, 772 INT *minScf, 773 FIXP_DBL *sfbDist, 774 FIXP_DBL *sfbConstPePart, 775 FIXP_DBL *sfbFormFactorLdData, 776 FIXP_DBL *sfbNRelevantLines) 777 { 778 INT sfb, startSfb, stopSfb; 779 INT scfTmp[MAX_GROUPED_SFB], scfAct, scfNew; 780 INT scfPrev, scfNext, scfPrevNextMin, scfPrevNextMax, scfLo, scfHi; 781 INT scfMin, scfMax; 782 INT *sfbOffs = psyOutChan->sfbOffsets; 783 FIXP_DBL sfbDistNew[MAX_GROUPED_SFB], sfbDistMax[MAX_GROUPED_SFB]; 784 FIXP_DBL distOldSum, distNewSum; 785 INT deltaScfBits; 786 FIXP_DBL deltaSpecPe; 787 FIXP_DBL deltaPe = FL2FXCONST_DBL(0.0f); 788 FIXP_DBL deltaPeNew = FL2FXCONST_DBL(0.0f); 789 INT sfbCnt = psyOutChan->sfbCnt; 790 INT bSuccess, bCheckScf; 791 INT i,k; 792 793 /* calc min and max scalfactors */ 794 scfMin = FDK_INT_MAX; 795 scfMax = FDK_INT_MIN; 796 for (sfb=0; sfb<sfbCnt; sfb++) { 797 if (scf[sfb]!=FDK_INT_MIN) { 798 scfMin = fixMin(scfMin, scf[sfb]); 799 scfMax = fixMax(scfMax, scf[sfb]); 800 } 801 } 802 803 stopSfb = 0; 804 scfAct = FDK_INT_MIN; 805 do { 806 /* search for region with same scf values scfAct */ 807 scfPrev = scfAct; 808 809 sfb = stopSfb; 810 while (sfb<sfbCnt && (scf[sfb]==FDK_INT_MIN)) 811 sfb++; 812 startSfb = sfb; 813 scfAct = scf[startSfb]; 814 sfb++; 815 while (sfb<sfbCnt && ((scf[sfb]==FDK_INT_MIN) || (scf[sfb]==scf[startSfb]))) 816 sfb++; 817 stopSfb = sfb; 818 819 if (stopSfb < sfbCnt) 820 scfNext = scf[stopSfb]; 821 else 822 scfNext = scfAct; 823 824 if (scfPrev == FDK_INT_MIN) 825 scfPrev = scfAct; 826 827 scfPrevNextMax = fixMax(scfPrev, scfNext); 828 scfPrevNextMin = fixMin(scfPrev, scfNext); 829 830 /* try to reduce bits by checking scf values in the range 831 scf[startSfb]...scfHi */ 832 scfHi = fixMax(scfPrevNextMax, scfAct); 833 /* try to find a better solution by reducing the scf difference to 834 the nearest possible lower scf */ 835 if (scfPrevNextMax >= scfAct) 836 scfLo = fixMin(scfAct, scfPrevNextMin); 837 else 838 scfLo = scfPrevNextMax; 839 840 if (startSfb < sfbCnt && scfHi-scfLo <= MAX_SCF_DELTA) { /* region found */ 841 /* 1. try to save bits by coarser quantization */ 842 if (scfHi > scf[startSfb]) { 843 /* calculate the allowed distortion */ 844 for (sfb=startSfb; sfb<stopSfb; sfb++) { 845 if (scf[sfb] != FDK_INT_MIN) { 846 /* sfbDistMax[sfb] = (float)pow(qcOutChannel->sfbThreshold[sfb]*sfbDist[sfb]*sfbDist[sfb],1.0f/3.0f); */ 847 /* sfbDistMax[sfb] = fixMax(sfbDistMax[sfb],qcOutChannel->sfbEnergy[sfb]*FL2FXCONST_DBL(1.e-3f)); */ 848 /* -0.15571537944 = ld64(1.e-3f)*/ 849 sfbDistMax[sfb] = fMult(FL2FXCONST_DBL(1.0f/3.0f),qcOutChannel->sfbThresholdLdData[sfb])+fMult(FL2FXCONST_DBL(1.0f/3.0f),sfbDist[sfb])+fMult(FL2FXCONST_DBL(1.0f/3.0f),sfbDist[sfb]); 850 sfbDistMax[sfb] = fixMax(sfbDistMax[sfb],qcOutChannel->sfbEnergyLdData[sfb]-FL2FXCONST_DBL(0.15571537944)); 851 sfbDistMax[sfb] = fixMin(sfbDistMax[sfb],qcOutChannel->sfbThresholdLdData[sfb]); 852 } 853 } 854 855 /* loop over all possible scf values for this region */ 856 bCheckScf = 1; 857 for (scfNew=scf[startSfb]+1; scfNew<=scfHi; scfNew++) { 858 for (k=0; k<MAX_GROUPED_SFB; k++) 859 scfTmp[k] = scf[k]; 860 861 /* replace scfs in region by scfNew */ 862 for (sfb=startSfb; sfb<stopSfb; sfb++) { 863 if (scfTmp[sfb] != FDK_INT_MIN) 864 scfTmp[sfb] = scfNew; 865 } 866 867 /* estimate change in bit demand for new scfs */ 868 deltaScfBits = FDKaacEnc_countScfBitsDiff(scf,scfTmp,sfbCnt,startSfb,stopSfb); 869 870 deltaSpecPe = FDKaacEnc_calcSpecPeDiff(psyOutChan, qcOutChannel, scf, scfTmp, sfbConstPePart, 871 sfbFormFactorLdData, sfbNRelevantLines, 872 startSfb, stopSfb); 873 874 deltaPeNew = deltaPe + (FIXP_DBL)deltaScfBits + deltaSpecPe; 875 876 /* new bit demand small enough ? */ 877 if (deltaPeNew < FL2FXCONST_DBL(0.0f)) { 878 bSuccess = 1; 879 880 /* quantize and calc sum of new distortion */ 881 for (sfb=startSfb; sfb<stopSfb; sfb++) { 882 if (scfTmp[sfb] != FDK_INT_MIN) { 883 sfbDistNew[sfb] = FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+sfbOffs[sfb], 884 quantSpecTmp+sfbOffs[sfb], 885 sfbOffs[sfb+1]-sfbOffs[sfb], 886 scfNew); 887 888 if (sfbDistNew[sfb] > sfbDistMax[sfb]) { 889 /* no improvement, skip further dist. calculations */ 890 bSuccess = 0; 891 if (sfbDistNew[sfb] == qcOutChannel->sfbEnergyLdData[sfb]) { 892 /* if whole sfb is already quantized to 0, further 893 checks with even coarser quant. are useless*/ 894 bCheckScf = 0; 895 } 896 break; 897 } 898 } 899 } 900 if (bCheckScf==0) /* further calculations useless ? */ 901 break; 902 /* distortion small enough ? -> use new scalefactors */ 903 if (bSuccess) { 904 deltaPe = deltaPeNew; 905 for (sfb=startSfb; sfb<stopSfb; sfb++) { 906 if (scf[sfb] != FDK_INT_MIN) { 907 scf[sfb] = scfNew; 908 sfbDist[sfb] = sfbDistNew[sfb]; 909 910 for (k=0; k<sfbOffs[sfb+1]-sfbOffs[sfb]; k++) 911 quantSpec[sfbOffs[sfb]+k] = quantSpecTmp[sfbOffs[sfb]+k]; 912 } 913 } 914 } 915 } 916 } 917 } 918 919 /* 2. only if coarser quantization was not successful, try to find 920 a better solution by finer quantization and reducing bits for 921 scalefactor coding */ 922 if (scfAct==scf[startSfb] && 923 scfLo < scfAct && 924 scfMax-scfMin <= MAX_SCF_DELTA) { 925 926 int bminScfViolation = 0; 927 928 for (k=0; k<MAX_GROUPED_SFB; k++) 929 scfTmp[k] = scf[k]; 930 931 scfNew = scfLo; 932 933 /* replace scfs in region by scfNew and 934 check if in all sfb scfNew >= minScf[sfb] */ 935 for (sfb=startSfb; sfb<stopSfb; sfb++) { 936 if (scfTmp[sfb] != FDK_INT_MIN) { 937 scfTmp[sfb] = scfNew; 938 if (scfNew < minScf[sfb]) 939 bminScfViolation = 1; 940 } 941 } 942 943 if (!bminScfViolation) { 944 /* estimate change in bit demand for new scfs */ 945 deltaScfBits = FDKaacEnc_countScfBitsDiff(scf,scfTmp,sfbCnt,startSfb,stopSfb); 946 947 deltaSpecPe = FDKaacEnc_calcSpecPeDiff(psyOutChan, qcOutChannel, scf, scfTmp, sfbConstPePart, 948 sfbFormFactorLdData, sfbNRelevantLines, 949 startSfb, stopSfb); 950 951 deltaPeNew = deltaPe + (FIXP_DBL)deltaScfBits + deltaSpecPe; 952 } 953 954 /* new bit demand small enough ? */ 955 if (!bminScfViolation && deltaPeNew < FL2FXCONST_DBL(0.0f)) { 956 957 /* quantize and calc sum of new distortion */ 958 distOldSum = distNewSum = FL2FXCONST_DBL(0.0f); 959 for (sfb=startSfb; sfb<stopSfb; sfb++) { 960 if (scfTmp[sfb] != FDK_INT_MIN) { 961 distOldSum += CalcInvLdData(sfbDist[sfb]) >> DIST_FAC_SHIFT; 962 963 sfbDistNew[sfb] = FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+sfbOffs[sfb], 964 quantSpecTmp+sfbOffs[sfb], 965 sfbOffs[sfb+1]-sfbOffs[sfb], 966 scfNew); 967 968 if (sfbDistNew[sfb] > qcOutChannel->sfbThresholdLdData[sfb]) { 969 /* no improvement, skip further dist. calculations */ 970 distNewSum = distOldSum << 1; 971 break; 972 } 973 distNewSum += CalcInvLdData(sfbDistNew[sfb]) >> DIST_FAC_SHIFT; 974 } 975 } 976 /* distortion smaller ? -> use new scalefactors */ 977 if (distNewSum < fMult(FL2FXCONST_DBL(0.8f),distOldSum)) { 978 deltaPe = deltaPeNew; 979 for (sfb=startSfb; sfb<stopSfb; sfb++) { 980 if (scf[sfb] != FDK_INT_MIN) { 981 scf[sfb] = scfNew; 982 sfbDist[sfb] = sfbDistNew[sfb]; 983 984 for (k=0; k<sfbOffs[sfb+1]-sfbOffs[sfb]; k++) 985 quantSpec[sfbOffs[sfb]+k] = quantSpecTmp[sfbOffs[sfb]+k]; 986 } 987 } 988 } 989 } 990 } 991 992 /* 3. try to find a better solution (save bits) by only reducing the 993 scalefactor without new quantization */ 994 if (scfMax-scfMin <= MAX_SCF_DELTA-3) { /* 3 bec. scf is reduced 3 times, 995 see for loop below */ 996 997 for (k=0; k<sfbCnt; k++) 998 scfTmp[k] = scf[k]; 999 1000 for (i=0; i<3; i++) { 1001 scfNew = scfTmp[startSfb]-1; 1002 /* replace scfs in region by scfNew */ 1003 for (sfb=startSfb; sfb<stopSfb; sfb++) { 1004 if (scfTmp[sfb] != FDK_INT_MIN) 1005 scfTmp[sfb] = scfNew; 1006 } 1007 /* estimate change in bit demand for new scfs */ 1008 deltaScfBits = FDKaacEnc_countScfBitsDiff(scf,scfTmp,sfbCnt,startSfb,stopSfb); 1009 deltaPeNew = deltaPe + (FIXP_DBL)deltaScfBits; 1010 /* new bit demand small enough ? */ 1011 if (deltaPeNew <= FL2FXCONST_DBL(0.0f)) { 1012 1013 bSuccess = 1; 1014 distOldSum = distNewSum = FL2FXCONST_DBL(0.0f); 1015 for (sfb=startSfb; sfb<stopSfb; sfb++) { 1016 if (scfTmp[sfb] != FDK_INT_MIN) { 1017 FIXP_DBL sfbEnQ; 1018 /* calc the energy and distortion of the quantized spectrum for 1019 a smaller scf */ 1020 FDKaacEnc_calcSfbQuantEnergyAndDist(qcOutChannel->mdctSpectrum+sfbOffs[sfb], 1021 quantSpec+sfbOffs[sfb], 1022 sfbOffs[sfb+1]-sfbOffs[sfb], scfNew, 1023 &sfbEnQ, &sfbDistNew[sfb]); 1024 1025 distOldSum += CalcInvLdData(sfbDist[sfb]) >> DIST_FAC_SHIFT; 1026 distNewSum += CalcInvLdData(sfbDistNew[sfb]) >> DIST_FAC_SHIFT; 1027 1028 /* 0.00259488556167 = ld64(1.122f) */ 1029 /* -0.00778722686652 = ld64(0.7079f) */ 1030 if ((sfbDistNew[sfb] > (sfbDist[sfb]+FL2FXCONST_DBL(0.00259488556167f))) || (sfbEnQ < (qcOutChannel->sfbEnergyLdData[sfb] - FL2FXCONST_DBL(0.00778722686652f)))){ 1031 bSuccess = 0; 1032 break; 1033 } 1034 } 1035 } 1036 /* distortion smaller ? -> use new scalefactors */ 1037 if (distNewSum < distOldSum && bSuccess) { 1038 deltaPe = deltaPeNew; 1039 for (sfb=startSfb; sfb<stopSfb; sfb++) { 1040 if (scf[sfb] != FDK_INT_MIN) { 1041 scf[sfb] = scfNew; 1042 sfbDist[sfb] = sfbDistNew[sfb]; 1043 } 1044 } 1045 } 1046 } 1047 } 1048 } 1049 } 1050 } while (stopSfb <= sfbCnt); 1051 1052 } 1053 1054 static void 1055 FDKaacEnc_FDKaacEnc_EstimateScaleFactorsChannel(QC_OUT_CHANNEL *qcOutChannel, 1056 PSY_OUT_CHANNEL *psyOutChannel, 1057 INT *RESTRICT scf, 1058 INT *RESTRICT globalGain, 1059 FIXP_DBL *RESTRICT sfbFormFactorLdData 1060 ,const INT invQuant, 1061 SHORT *RESTRICT quantSpec 1062 ) 1063 { 1064 INT i, j, sfb, sfbOffs; 1065 INT scfInt; 1066 INT maxSf; 1067 INT minSf; 1068 FIXP_DBL threshLdData; 1069 FIXP_DBL energyLdData; 1070 FIXP_DBL energyPartLdData; 1071 FIXP_DBL thresholdPartLdData; 1072 FIXP_DBL scfFract; 1073 FIXP_DBL maxSpec; 1074 FIXP_DBL absSpec; 1075 INT minScfCalculated[MAX_GROUPED_SFB]; 1076 FIXP_DBL sfbDistLdData[MAX_GROUPED_SFB]; 1077 C_ALLOC_SCRATCH_START(quantSpecTmp, SHORT, (1024)); 1078 INT minSfMaxQuant[MAX_GROUPED_SFB]; 1079 1080 FIXP_DBL threshConstLdData=FL2FXCONST_DBL(0.04304511722f); /* log10(6.75)/log10(2.0)/64.0 */ 1081 FIXP_DBL convConst=FL2FXCONST_DBL(0.30102999566f); /* log10(2.0) */ 1082 FIXP_DBL c1Const=FL2FXCONST_DBL(-0.27083183594f); /* C1 = -69.33295 => C1/2^8 */ 1083 1084 1085 1086 if (invQuant>0) { 1087 FDKmemclear(quantSpec, (1024)*sizeof(SHORT)); 1088 } 1089 1090 /* scfs without energy or with thresh>energy are marked with FDK_INT_MIN */ 1091 for(i=0; i<psyOutChannel->sfbCnt; i++) { 1092 scf[i] = FDK_INT_MIN; 1093 } 1094 1095 for (i=0; i<MAX_GROUPED_SFB; i++) { 1096 minSfMaxQuant[i] = FDK_INT_MIN; 1097 } 1098 1099 for (sfbOffs=0; sfbOffs<psyOutChannel->sfbCnt; sfbOffs+=psyOutChannel->sfbPerGroup) { 1100 for(sfb=0; sfb<psyOutChannel->maxSfbPerGroup; sfb++) { 1101 1102 threshLdData = qcOutChannel->sfbThresholdLdData[sfbOffs+sfb]; 1103 energyLdData = qcOutChannel->sfbEnergyLdData[sfbOffs+sfb]; 1104 1105 sfbDistLdData[sfbOffs+sfb] = energyLdData; 1106 1107 1108 if (energyLdData > threshLdData) { 1109 FIXP_DBL tmp; 1110 1111 /* energyPart = (float)log10(sfbFormFactor[sfbOffs+sfb]); */ 1112 /* 0.09375f = log(64.0)/log(2.0)/64.0 = scale of sfbFormFactorLdData */ 1113 energyPartLdData = sfbFormFactorLdData[sfbOffs+sfb] + FL2FXCONST_DBL(0.09375f); 1114 1115 /* influence of allowed distortion */ 1116 /* thresholdPart = (float)log10(6.75*thresh+FLT_MIN); */ 1117 thresholdPartLdData = threshConstLdData + threshLdData; 1118 1119 /* scf calc */ 1120 /* scfFloat = 8.8585f * (thresholdPart - energyPart); */ 1121 scfFract = thresholdPartLdData - energyPartLdData; 1122 /* conversion from log2 to log10 */ 1123 scfFract = fMult(convConst,scfFract); 1124 /* (8.8585f * scfFract)/8 = 8/8 * scfFract + 0.8585 * scfFract/8 */ 1125 scfFract = scfFract + fMult(FL2FXCONST_DBL(0.8585f),scfFract >> 3); 1126 1127 /* integer scalefactor */ 1128 /* scfInt = (int)floor(scfFloat); */ 1129 scfInt = (INT)(scfFract>>((DFRACT_BITS-1)-3-LD_DATA_SHIFT)); /* 3 bits => scfFract/8.0; 6 bits => ld64 */ 1130 1131 /* maximum of spectrum */ 1132 maxSpec = FL2FXCONST_DBL(0.0f); 1133 1134 for(j=psyOutChannel->sfbOffsets[sfbOffs+sfb]; j<psyOutChannel->sfbOffsets[sfbOffs+sfb+1]; j++ ){ 1135 absSpec = fixp_abs(qcOutChannel->mdctSpectrum[j]); 1136 maxSpec = (absSpec > maxSpec) ? absSpec : maxSpec; 1137 } 1138 1139 /* lower scf limit to avoid quantized values bigger than MAX_QUANT */ 1140 /* C1 = -69.33295f, C2 = 5.77078f = 4/log(2) */ 1141 /* minSfMaxQuant[sfbOffs+sfb] = (int)ceil(C1 + C2*log(maxSpec)); */ 1142 /* C1/2^8 + 4/log(2.0)*log(maxSpec)/2^8 => C1/2^8 + log(maxSpec)/log(2.0)*4/2^8 => C1/2^8 + log(maxSpec)/log(2.0)/64.0 */ 1143 1144 //minSfMaxQuant[sfbOffs+sfb] = ((INT) ((c1Const + CalcLdData(maxSpec)) >> ((DFRACT_BITS-1)-8))) + 1; 1145 tmp = CalcLdData(maxSpec); 1146 if (c1Const>FL2FXCONST_DBL(-1.f)-tmp) { 1147 minSfMaxQuant[sfbOffs+sfb] = ((INT) ((c1Const + tmp) >> ((DFRACT_BITS-1)-8))) + 1; 1148 } 1149 else { 1150 minSfMaxQuant[sfbOffs+sfb] = ((INT) (FL2FXCONST_DBL(-1.f) >> ((DFRACT_BITS-1)-8))) + 1; 1151 } 1152 1153 scfInt = fixMax(scfInt, minSfMaxQuant[sfbOffs+sfb]); 1154 1155 1156 /* find better scalefactor with analysis by synthesis */ 1157 if (invQuant>0) { 1158 scfInt = FDKaacEnc_improveScf(qcOutChannel->mdctSpectrum+psyOutChannel->sfbOffsets[sfbOffs+sfb], 1159 quantSpec+psyOutChannel->sfbOffsets[sfbOffs+sfb], 1160 quantSpecTmp+psyOutChannel->sfbOffsets[sfbOffs+sfb], 1161 psyOutChannel->sfbOffsets[sfbOffs+sfb+1]-psyOutChannel->sfbOffsets[sfbOffs+sfb], 1162 threshLdData, scfInt, minSfMaxQuant[sfbOffs+sfb], 1163 &sfbDistLdData[sfbOffs+sfb], &minScfCalculated[sfbOffs+sfb] 1164 ); 1165 } 1166 scf[sfbOffs+sfb] = scfInt; 1167 } 1168 } 1169 } 1170 1171 1172 if (invQuant>1) { 1173 /* try to decrease scf differences */ 1174 FIXP_DBL sfbConstPePart[MAX_GROUPED_SFB]; 1175 FIXP_DBL sfbNRelevantLines[MAX_GROUPED_SFB]; 1176 1177 for (i=0; i<psyOutChannel->sfbCnt; i++) 1178 sfbConstPePart[i] = (FIXP_DBL)FDK_INT_MIN; 1179 1180 FDKaacEnc_calcSfbRelevantLines( sfbFormFactorLdData, 1181 qcOutChannel->sfbEnergyLdData, 1182 qcOutChannel->sfbThresholdLdData, 1183 psyOutChannel->sfbOffsets, 1184 psyOutChannel->sfbCnt, 1185 psyOutChannel->sfbPerGroup, 1186 psyOutChannel->maxSfbPerGroup, 1187 sfbNRelevantLines); 1188 1189 1190 FDKaacEnc_assimilateSingleScf(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp, scf, 1191 minSfMaxQuant, sfbDistLdData, sfbConstPePart, 1192 sfbFormFactorLdData, sfbNRelevantLines, minScfCalculated, 1); 1193 1194 1195 FDKaacEnc_assimilateMultipleScf(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp, scf, 1196 minSfMaxQuant, sfbDistLdData, sfbConstPePart, 1197 sfbFormFactorLdData, sfbNRelevantLines); 1198 1199 1200 FDKaacEnc_FDKaacEnc_assimilateMultipleScf2(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp, scf, 1201 minSfMaxQuant, sfbDistLdData, sfbConstPePart, 1202 sfbFormFactorLdData, sfbNRelevantLines); 1203 1204 } 1205 1206 1207 /* get min scalefac */ 1208 minSf = FDK_INT_MAX; 1209 for (sfbOffs=0; sfbOffs<psyOutChannel->sfbCnt; sfbOffs+=psyOutChannel->sfbPerGroup) { 1210 for (sfb = 0; sfb < psyOutChannel->maxSfbPerGroup; sfb++) { 1211 if (scf[sfbOffs+sfb]!=FDK_INT_MIN) 1212 minSf = fixMin(minSf,scf[sfbOffs+sfb]); 1213 } 1214 } 1215 1216 /* limit scf delta */ 1217 for (sfbOffs=0; sfbOffs<psyOutChannel->sfbCnt; sfbOffs+=psyOutChannel->sfbPerGroup) { 1218 for (sfb = 0; sfb < psyOutChannel->maxSfbPerGroup; sfb++) { 1219 if ((scf[sfbOffs+sfb] != FDK_INT_MIN) && (minSf+MAX_SCF_DELTA) < scf[sfbOffs+sfb]) { 1220 scf[sfbOffs+sfb] = minSf + MAX_SCF_DELTA; 1221 if (invQuant > 0) { /* changed bands need to be quantized again */ 1222 sfbDistLdData[sfbOffs+sfb] = 1223 FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+psyOutChannel->sfbOffsets[sfbOffs+sfb], 1224 quantSpec+psyOutChannel->sfbOffsets[sfbOffs+sfb], 1225 psyOutChannel->sfbOffsets[sfbOffs+sfb+1]-psyOutChannel->sfbOffsets[sfbOffs+sfb], 1226 scf[sfbOffs+sfb] 1227 ); 1228 } 1229 } 1230 } 1231 } 1232 1233 1234 /* get max scalefac for global gain */ 1235 maxSf = FDK_INT_MIN; 1236 for (sfbOffs=0; sfbOffs<psyOutChannel->sfbCnt; sfbOffs+=psyOutChannel->sfbPerGroup) { 1237 for (sfb = 0; sfb < psyOutChannel->maxSfbPerGroup; sfb++) { 1238 maxSf = fixMax(maxSf,scf[sfbOffs+sfb]); 1239 } 1240 } 1241 1242 /* calc loop scalefactors, if spec is not all zero (i.e. maxSf == -99) */ 1243 if( maxSf > FDK_INT_MIN ) { 1244 *globalGain = maxSf; 1245 for (sfbOffs=0; sfbOffs<psyOutChannel->sfbCnt; sfbOffs+=psyOutChannel->sfbPerGroup) { 1246 for (sfb = 0; sfb < psyOutChannel->maxSfbPerGroup; sfb++) { 1247 if( scf[sfbOffs+sfb] == FDK_INT_MIN ) { 1248 scf[sfbOffs+sfb] = 0; 1249 /* set band explicitely to zero */ 1250 for(j=psyOutChannel->sfbOffsets[sfbOffs+sfb]; j<psyOutChannel->sfbOffsets[sfbOffs+sfb+1]; j++ ) { 1251 qcOutChannel->mdctSpectrum[j] = FL2FXCONST_DBL(0.0f); 1252 } 1253 } 1254 else { 1255 scf[sfbOffs+sfb] = maxSf - scf[sfbOffs+sfb]; 1256 } 1257 } 1258 } 1259 } 1260 else{ 1261 *globalGain = 0; 1262 /* set spectrum explicitely to zero */ 1263 for (sfbOffs=0; sfbOffs<psyOutChannel->sfbCnt; sfbOffs+=psyOutChannel->sfbPerGroup) { 1264 for (sfb = 0; sfb < psyOutChannel->maxSfbPerGroup; sfb++) { 1265 scf[sfbOffs+sfb] = 0; 1266 /* set band explicitely to zero */ 1267 for(j=psyOutChannel->sfbOffsets[sfbOffs+sfb]; j<psyOutChannel->sfbOffsets[sfbOffs+sfb+1]; j++ ) { 1268 qcOutChannel->mdctSpectrum[j] = FL2FXCONST_DBL(0.0f); 1269 } 1270 } 1271 } 1272 } 1273 1274 /* free quantSpecTmp from scratch */ 1275 C_ALLOC_SCRATCH_END(quantSpecTmp, SHORT, (1024)); 1276 1277 1278 } 1279 1280 void 1281 FDKaacEnc_EstimateScaleFactors(PSY_OUT_CHANNEL *psyOutChannel[], 1282 QC_OUT_CHANNEL* qcOutChannel[], 1283 const int invQuant, 1284 const int nChannels) 1285 { 1286 int ch; 1287 1288 for (ch = 0; ch < nChannels; ch++) 1289 { 1290 FDKaacEnc_FDKaacEnc_EstimateScaleFactorsChannel(qcOutChannel[ch], 1291 psyOutChannel[ch], 1292 qcOutChannel[ch]->scf, 1293 &qcOutChannel[ch]->globalGain, 1294 qcOutChannel[ch]->sfbFormFactorLdData 1295 ,invQuant, 1296 qcOutChannel[ch]->quantSpec 1297 ); 1298 } 1299 1300 } 1301 1302
