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#include "invf_est.h" 85#include "sbr_misc.h" 86 87#include "genericStds.h" 88 89#define MAX_NUM_REGIONS 10 90#define SCALE_FAC_QUO 512.0f 91#define SCALE_FAC_NRG 256.0f 92 93#ifndef min 94#define min(a,b) ( a < b ? a:b) 95#endif 96 97#ifndef max 98#define max(a,b) ( a > b ? a:b) 99#endif 100 101static const FIXP_DBL quantStepsSbr[4] = { 0x00400000, 0x02800000, 0x03800000, 0x04c00000 } ; /* table scaled with SCALE_FAC_QUO */ 102static const FIXP_DBL quantStepsOrig[4] = { 0x00000000, 0x00c00000, 0x01c00000, 0x02800000 } ; /* table scaled with SCALE_FAC_QUO */ 103static const FIXP_DBL nrgBorders[4] = { 0x0c800000, 0x0f000000, 0x11800000, 0x14000000 } ; /* table scaled with SCALE_FAC_NRG */ 104 105static const DETECTOR_PARAMETERS detectorParamsAAC = { 106 quantStepsSbr, 107 quantStepsOrig, 108 nrgBorders, 109 4, /* Number of borders SBR. */ 110 4, /* Number of borders orig. */ 111 4, /* Number of borders Nrg. */ 112 { /* Region space. */ 113 {INVF_MID_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF, INVF_OFF}, /* | */ 114 {INVF_MID_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF, INVF_OFF}, /* | */ 115 {INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF}, /* regionSbr */ 116 {INVF_HIGH_LEVEL, INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 117 {INVF_HIGH_LEVEL, INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF} /* | */ 118 },/*------------------------ regionOrig ---------------------------------*/ 119 { /* Region space transient. */ 120 {INVF_LOW_LEVEL, INVF_LOW_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 121 {INVF_LOW_LEVEL, INVF_LOW_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 122 {INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF}, /* regionSbr */ 123 {INVF_HIGH_LEVEL, INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 124 {INVF_HIGH_LEVEL, INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF} /* | */ 125 },/*------------------------ regionOrig ---------------------------------*/ 126 {-4, -3, -2, -1, 0} /* Reduction factor of the inverse filtering for low energies.*/ 127}; 128 129static const FIXP_DBL hysteresis = 0x00400000 ; /* Delta value for hysteresis. scaled with SCALE_FAC_QUO */ 130 131/* 132 * AAC+SBR PARAMETERS for Speech 133 *********************************/ 134static const DETECTOR_PARAMETERS detectorParamsAACSpeech = { 135 quantStepsSbr, 136 quantStepsOrig, 137 nrgBorders, 138 4, /* Number of borders SBR. */ 139 4, /* Number of borders orig. */ 140 4, /* Number of borders Nrg. */ 141 { /* Region space. */ 142 {INVF_MID_LEVEL, INVF_MID_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 143 {INVF_MID_LEVEL, INVF_MID_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 144 {INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF}, /* regionSbr */ 145 {INVF_HIGH_LEVEL, INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 146 {INVF_HIGH_LEVEL, INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF} /* | */ 147 },/*------------------------ regionOrig ---------------------------------*/ 148 { /* Region space transient. */ 149 {INVF_MID_LEVEL, INVF_MID_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 150 {INVF_MID_LEVEL, INVF_MID_LEVEL, INVF_LOW_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 151 {INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF}, /* regionSbr */ 152 {INVF_HIGH_LEVEL, INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF}, /* | */ 153 {INVF_HIGH_LEVEL, INVF_HIGH_LEVEL, INVF_MID_LEVEL, INVF_OFF, INVF_OFF} /* | */ 154 },/*------------------------ regionOrig ---------------------------------*/ 155 {-4, -3, -2, -1, 0} /* Reduction factor of the inverse filtering for low energies.*/ 156}; 157 158/* 159 * Smoothing filters. 160 ************************/ 161typedef const FIXP_DBL FIR_FILTER[5]; 162 163static const FIR_FILTER fir_0 = { 0x7fffffff, 0x00000000, 0x00000000, 0x00000000, 0x00000000 } ; 164static const FIR_FILTER fir_1 = { 0x2aaaaa80, 0x555554ff, 0x00000000, 0x00000000, 0x00000000 } ; 165static const FIR_FILTER fir_2 = { 0x10000000, 0x30000000, 0x40000000, 0x00000000, 0x00000000 } ; 166static const FIR_FILTER fir_3 = { 0x077f80e8, 0x199999a0, 0x2bb3b240, 0x33333340, 0x00000000 } ; 167static const FIR_FILTER fir_4 = { 0x04130598, 0x0ebdb000, 0x1becfa60, 0x2697a4c0, 0x2aaaaa80 } ; 168 169 170static const FIR_FILTER *const fir_table[5] = { 171 &fir_0, 172 &fir_1, 173 &fir_2, 174 &fir_3, 175 &fir_4 176}; 177 178/**************************************************************************/ 179/*! 180 \brief Calculates the values used for the detector. 181 182 183 \return none 184 185*/ 186/**************************************************************************/ 187static void 188calculateDetectorValues(FIXP_DBL **quotaMatrixOrig, /*!< Matrix holding the tonality values of the original. */ 189 SCHAR *indexVector, /*!< Index vector to obtain the patched data. */ 190 FIXP_DBL *nrgVector, /*!< Energy vector. */ 191 DETECTOR_VALUES *detectorValues, /*!< pointer to DETECTOR_VALUES struct. */ 192 INT startChannel, /*!< Start channel. */ 193 INT stopChannel, /*!< Stop channel. */ 194 INT startIndex, /*!< Start index. */ 195 INT stopIndex, /*!< Stop index. */ 196 INT numberOfStrongest /*!< The number of sorted tonal components to be considered. */ 197 ) 198{ 199 INT i,temp, j; 200 201 const FIXP_DBL* filter = *fir_table[INVF_SMOOTHING_LENGTH]; 202 FIXP_DBL origQuotaMeanStrongest, sbrQuotaMeanStrongest; 203 FIXP_DBL origQuota, sbrQuota; 204 FIXP_DBL invIndex, invChannel, invTemp; 205 FIXP_DBL quotaVecOrig[64], quotaVecSbr[64]; 206 207 FDKmemclear(quotaVecOrig,64*sizeof(FIXP_DBL)); 208 FDKmemclear(quotaVecSbr,64*sizeof(FIXP_DBL)); 209 210 invIndex = GetInvInt(stopIndex-startIndex); 211 invChannel = GetInvInt(stopChannel-startChannel); 212 213 /* 214 Calculate the mean value, over the current time segment, for the original, the HFR 215 and the difference, over all channels in the current frequency range. 216 NOTE: the averaging is done on the values quota/(1 - quota + RELAXATION). 217 */ 218 219 /* The original, the sbr signal and the total energy */ 220 detectorValues->avgNrg = FL2FXCONST_DBL(0.0f); 221 for(j=startIndex; j<stopIndex; j++) { 222 for(i=startChannel; i<stopChannel; i++) { 223 quotaVecOrig[i] += fMult(quotaMatrixOrig[j][i], invIndex); 224 225 if(indexVector[i] != -1) 226 quotaVecSbr[i] += fMult(quotaMatrixOrig[j][indexVector[i]], invIndex); 227 } 228 detectorValues->avgNrg += fMult(nrgVector[j], invIndex); 229 } 230 231 /* 232 Calculate the mean value, over the current frequency range, for the original, the HFR 233 and the difference. Also calculate the same mean values for the three vectors, but only 234 includeing the x strongest copmponents. 235 */ 236 237 origQuota = FL2FXCONST_DBL(0.0f); 238 sbrQuota = FL2FXCONST_DBL(0.0f); 239 for(i=startChannel; i<stopChannel; i++) { 240 origQuota += fMultDiv2(quotaVecOrig[i], invChannel); 241 sbrQuota += fMultDiv2(quotaVecSbr[i], invChannel); 242 } 243 244 /* 245 Calculate the mean value for the x strongest components 246 */ 247 FDKsbrEnc_Shellsort_fract(quotaVecOrig+startChannel,stopChannel-startChannel); 248 FDKsbrEnc_Shellsort_fract(quotaVecSbr+startChannel,stopChannel-startChannel); 249 250 origQuotaMeanStrongest = FL2FXCONST_DBL(0.0f); 251 sbrQuotaMeanStrongest = FL2FXCONST_DBL(0.0f); 252 253 temp = min(stopChannel - startChannel, numberOfStrongest); 254 invTemp = GetInvInt(temp); 255 256 for(i=0; i<temp; i++) { 257 origQuotaMeanStrongest += fMultDiv2(quotaVecOrig[i + stopChannel - temp], invTemp); 258 sbrQuotaMeanStrongest += fMultDiv2(quotaVecSbr[i + stopChannel - temp], invTemp); 259 } 260 261 /* 262 The value for the strongest component 263 */ 264 detectorValues->origQuotaMax = quotaVecOrig[stopChannel - 1]; 265 detectorValues->sbrQuotaMax = quotaVecSbr[stopChannel - 1]; 266 267 /* 268 Buffer values 269 */ 270 FDKmemmove(detectorValues->origQuotaMean, detectorValues->origQuotaMean + 1, INVF_SMOOTHING_LENGTH*sizeof(FIXP_DBL)); 271 FDKmemmove(detectorValues->sbrQuotaMean, detectorValues->sbrQuotaMean + 1, INVF_SMOOTHING_LENGTH*sizeof(FIXP_DBL)); 272 FDKmemmove(detectorValues->origQuotaMeanStrongest, detectorValues->origQuotaMeanStrongest + 1, INVF_SMOOTHING_LENGTH*sizeof(FIXP_DBL)); 273 FDKmemmove(detectorValues->sbrQuotaMeanStrongest, detectorValues->sbrQuotaMeanStrongest + 1, INVF_SMOOTHING_LENGTH*sizeof(FIXP_DBL)); 274 275 detectorValues->origQuotaMean[INVF_SMOOTHING_LENGTH] = origQuota<<1; 276 detectorValues->sbrQuotaMean[INVF_SMOOTHING_LENGTH] = sbrQuota<<1; 277 detectorValues->origQuotaMeanStrongest[INVF_SMOOTHING_LENGTH] = origQuotaMeanStrongest<<1; 278 detectorValues->sbrQuotaMeanStrongest[INVF_SMOOTHING_LENGTH] = sbrQuotaMeanStrongest<<1; 279 280 /* 281 Filter values 282 */ 283 detectorValues->origQuotaMeanFilt = FL2FXCONST_DBL(0.0f); 284 detectorValues->sbrQuotaMeanFilt = FL2FXCONST_DBL(0.0f); 285 detectorValues->origQuotaMeanStrongestFilt = FL2FXCONST_DBL(0.0f); 286 detectorValues->sbrQuotaMeanStrongestFilt = FL2FXCONST_DBL(0.0f); 287 288 for(i=0;i<INVF_SMOOTHING_LENGTH+1;i++) { 289 detectorValues->origQuotaMeanFilt += fMult(detectorValues->origQuotaMean[i], filter[i]); 290 detectorValues->sbrQuotaMeanFilt += fMult(detectorValues->sbrQuotaMean[i], filter[i]); 291 detectorValues->origQuotaMeanStrongestFilt += fMult(detectorValues->origQuotaMeanStrongest[i], filter[i]); 292 detectorValues->sbrQuotaMeanStrongestFilt += fMult(detectorValues->sbrQuotaMeanStrongest[i], filter[i]); 293 } 294} 295 296/**************************************************************************/ 297/*! 298 \brief Returns the region in which the input value belongs. 299 300 301 302 \return region. 303 304*/ 305/**************************************************************************/ 306static INT 307findRegion(FIXP_DBL currVal, /*!< The current value. */ 308 const FIXP_DBL *borders, /*!< The border of the regions. */ 309 const INT numBorders /*!< The number of borders. */ 310 ) 311{ 312 INT i; 313 314 if(currVal < borders[0]){ 315 return 0; 316 } 317 318 for(i = 1; i < numBorders; i++){ 319 if( currVal >= borders[i-1] && currVal < borders[i]){ 320 return i; 321 } 322 } 323 324 if(currVal >= borders[numBorders-1]){ 325 return numBorders; 326 } 327 328 return 0; /* We never get here, it's just to avoid compiler warnings.*/ 329} 330 331/**************************************************************************/ 332/*! 333 \brief Makes a clever decision based on the quota vector. 334 335 336 \return decision on which invf mode to use 337 338*/ 339/**************************************************************************/ 340static INVF_MODE 341decisionAlgorithm(const DETECTOR_PARAMETERS *detectorParams, /*!< Struct with the detector parameters. */ 342 DETECTOR_VALUES *detectorValues, /*!< Struct with the detector values. */ 343 INT transientFlag, /*!< Flag indicating if there is a transient present.*/ 344 INT* prevRegionSbr, /*!< The previous region in which the Sbr value was. */ 345 INT* prevRegionOrig /*!< The previous region in which the Orig value was. */ 346 ) 347{ 348 INT invFiltLevel, regionSbr, regionOrig, regionNrg; 349 350 /* 351 Current thresholds. 352 */ 353 const FIXP_DBL *quantStepsSbr = detectorParams->quantStepsSbr; 354 const FIXP_DBL *quantStepsOrig = detectorParams->quantStepsOrig; 355 const FIXP_DBL *nrgBorders = detectorParams->nrgBorders; 356 const INT numRegionsSbr = detectorParams->numRegionsSbr; 357 const INT numRegionsOrig = detectorParams->numRegionsOrig; 358 const INT numRegionsNrg = detectorParams->numRegionsNrg; 359 360 FIXP_DBL quantStepsSbrTmp[MAX_NUM_REGIONS]; 361 FIXP_DBL quantStepsOrigTmp[MAX_NUM_REGIONS]; 362 363 /* 364 Current detector values. 365 */ 366 FIXP_DBL origQuotaMeanFilt; 367 FIXP_DBL sbrQuotaMeanFilt; 368 FIXP_DBL nrg; 369 370 /* 0.375 = 3.0 / 8.0; 0.31143075889 = log2(RELAXATION)/64.0; 0.625 = log(16)/64.0; 0.6875 = 44/64.0 */ 371 origQuotaMeanFilt = (fMultDiv2(FL2FXCONST_DBL(2.f*0.375f), (FIXP_DBL)(CalcLdData(max(detectorValues->origQuotaMeanFilt,(FIXP_DBL)1)) + FL2FXCONST_DBL(0.31143075889f)))) << 0; /* scaled by 1/2^9 */ 372 sbrQuotaMeanFilt = (fMultDiv2(FL2FXCONST_DBL(2.f*0.375f), (FIXP_DBL)(CalcLdData(max(detectorValues->sbrQuotaMeanFilt,(FIXP_DBL)1)) + FL2FXCONST_DBL(0.31143075889f)))) << 0; /* scaled by 1/2^9 */ 373 /* If energy is zero then we will get different results for different word lengths. */ 374 nrg = (fMultDiv2(FL2FXCONST_DBL(2.f*0.375f), (FIXP_DBL)(CalcLdData(detectorValues->avgNrg+(FIXP_DBL)1) + FL2FXCONST_DBL(0.0625f) + FL2FXCONST_DBL(0.6875f)))) << 0; /* scaled by 1/2^8; 2^44 -> qmf energy scale */ 375 376 FDKmemcpy(quantStepsSbrTmp,quantStepsSbr,numRegionsSbr*sizeof(FIXP_DBL)); 377 FDKmemcpy(quantStepsOrigTmp,quantStepsOrig,numRegionsOrig*sizeof(FIXP_DBL)); 378 379 if(*prevRegionSbr < numRegionsSbr) 380 quantStepsSbrTmp[*prevRegionSbr] = quantStepsSbr[*prevRegionSbr] + hysteresis; 381 if(*prevRegionSbr > 0) 382 quantStepsSbrTmp[*prevRegionSbr - 1] = quantStepsSbr[*prevRegionSbr - 1] - hysteresis; 383 384 if(*prevRegionOrig < numRegionsOrig) 385 quantStepsOrigTmp[*prevRegionOrig] = quantStepsOrig[*prevRegionOrig] + hysteresis; 386 if(*prevRegionOrig > 0) 387 quantStepsOrigTmp[*prevRegionOrig - 1] = quantStepsOrig[*prevRegionOrig - 1] - hysteresis; 388 389 regionSbr = findRegion(sbrQuotaMeanFilt, quantStepsSbrTmp, numRegionsSbr); 390 regionOrig = findRegion(origQuotaMeanFilt, quantStepsOrigTmp, numRegionsOrig); 391 regionNrg = findRegion(nrg,nrgBorders,numRegionsNrg); 392 393 *prevRegionSbr = regionSbr; 394 *prevRegionOrig = regionOrig; 395 396 /* Use different settings if a transient is present*/ 397 invFiltLevel = (transientFlag == 1) ? detectorParams->regionSpaceTransient[regionSbr][regionOrig] 398 : detectorParams->regionSpace[regionSbr][regionOrig]; 399 400 /* Compensate for low energy.*/ 401 invFiltLevel = max(invFiltLevel + detectorParams->EnergyCompFactor[regionNrg],0); 402 403 return (INVF_MODE) (invFiltLevel); 404} 405 406/**************************************************************************/ 407/*! 408 \brief Estiamtion of the inverse filtering level required 409 in the decoder. 410 411 A second order LPC is calculated for every filterbank channel, using 412 the covariance method. THe ratio between the energy of the predicted 413 signal and the energy of the non-predictable signal is calcualted. 414 415 \return none. 416 417*/ 418/**************************************************************************/ 419void 420FDKsbrEnc_qmfInverseFilteringDetector(HANDLE_SBR_INV_FILT_EST hInvFilt, /*!< Handle to the SBR_INV_FILT_EST struct. */ 421 FIXP_DBL **quotaMatrix, /*!< The matrix holding the tonality values of the original. */ 422 FIXP_DBL *nrgVector, /*!< The energy vector. */ 423 SCHAR *indexVector, /*!< Index vector to obtain the patched data. */ 424 INT startIndex, /*!< Start index. */ 425 INT stopIndex, /*!< Stop index. */ 426 INT transientFlag, /*!< Flag indicating if a transient is present or not.*/ 427 INVF_MODE* infVec /*!< Vector holding the inverse filtering levels. */ 428 ) 429{ 430 INT band; 431 432 /* 433 * Do the inverse filtering level estimation. 434 *****************************************************/ 435 for(band = 0 ; band < hInvFilt->noDetectorBands; band++){ 436 INT startChannel = hInvFilt->freqBandTableInvFilt[band]; 437 INT stopChannel = hInvFilt->freqBandTableInvFilt[band+1]; 438 439 440 calculateDetectorValues( quotaMatrix, 441 indexVector, 442 nrgVector, 443 &hInvFilt->detectorValues[band], 444 startChannel, 445 stopChannel, 446 startIndex, 447 stopIndex, 448 hInvFilt->numberOfStrongest); 449 450 infVec[band]= decisionAlgorithm( hInvFilt->detectorParams, 451 &hInvFilt->detectorValues[band], 452 transientFlag, 453 &hInvFilt->prevRegionSbr[band], 454 &hInvFilt->prevRegionOrig[band]); 455 } 456 457} 458 459 460/**************************************************************************/ 461/*! 462 \brief Initialize an instance of the inverse filtering level estimator. 463 464 465 \return errorCode, noError if successful. 466 467*/ 468/**************************************************************************/ 469INT 470FDKsbrEnc_initInvFiltDetector (HANDLE_SBR_INV_FILT_EST hInvFilt, /*!< Pointer to a handle to the SBR_INV_FILT_EST struct. */ 471 INT* freqBandTableDetector, /*!< Frequency band table for the inverse filtering. */ 472 INT numDetectorBands, /*!< Number of inverse filtering bands. */ 473 UINT useSpeechConfig /*!< Flag: adapt tuning parameters according to speech*/ 474 ) 475{ 476 INT i; 477 478 FDKmemclear( hInvFilt,sizeof(SBR_INV_FILT_EST)); 479 480 hInvFilt->detectorParams = (useSpeechConfig) ? &detectorParamsAACSpeech 481 : &detectorParamsAAC ; 482 483 hInvFilt->noDetectorBandsMax = numDetectorBands; 484 485 /* 486 Memory initialisation 487 */ 488 for(i=0;i<hInvFilt->noDetectorBandsMax;i++){ 489 FDKmemclear(&hInvFilt->detectorValues[i], sizeof(DETECTOR_VALUES)); 490 hInvFilt->prevInvfMode[i] = INVF_OFF; 491 hInvFilt->prevRegionOrig[i] = 0; 492 hInvFilt->prevRegionSbr[i] = 0; 493 } 494 495 /* 496 Reset the inverse fltering detector. 497 */ 498 FDKsbrEnc_resetInvFiltDetector(hInvFilt, 499 freqBandTableDetector, 500 hInvFilt->noDetectorBandsMax); 501 502 return (0); 503} 504 505 506/**************************************************************************/ 507/*! 508 \brief resets sbr inverse filtering structure. 509 510 511 512 \return errorCode, noError if successful. 513 514*/ 515/**************************************************************************/ 516INT 517FDKsbrEnc_resetInvFiltDetector(HANDLE_SBR_INV_FILT_EST hInvFilt, /*!< Handle to the SBR_INV_FILT_EST struct. */ 518 INT* freqBandTableDetector, /*!< Frequency band table for the inverse filtering. */ 519 INT numDetectorBands) /*!< Number of inverse filtering bands. */ 520{ 521 522 hInvFilt->numberOfStrongest = 1; 523 FDKmemcpy(hInvFilt->freqBandTableInvFilt,freqBandTableDetector,(numDetectorBands+1)*sizeof(INT)); 524 hInvFilt->noDetectorBands = numDetectorBands; 525 526 return (0); 527} 528 529 530