1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2013 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 /*! 85 \file 86 \brief Sbr decoder 87 This module provides the actual decoder implementation. The SBR data (side information) is already 88 decoded. Only three functions are provided: 89 90 \li 1.) createSbrDec(): One time initialization 91 \li 2.) resetSbrDec(): Called by sbr_Apply() when the information contained in an SBR_HEADER_ELEMENT requires a reset 92 and recalculation of important SBR structures. 93 \li 3.) sbr_dec(): The actual decoder. Calls the different tools such as filterbanks, lppTransposer(), and calculateSbrEnvelope() 94 [the envelope adjuster]. 95 96 \sa sbr_dec(), \ref documentationOverview 97 */ 98 99 #include "sbr_dec.h" 100 101 #include "sbr_ram.h" 102 #include "env_extr.h" 103 #include "env_calc.h" 104 #include "scale.h" 105 106 #include "genericStds.h" 107 108 #include "sbrdec_drc.h" 109 110 111 112 static void assignLcTimeSlots( HANDLE_SBR_DEC hSbrDec, /*!< handle to Decoder channel */ 113 FIXP_DBL **QmfBufferReal, 114 int noCols ) 115 { 116 int slot, i; 117 FIXP_DBL *ptr; 118 119 /* Number of QMF timeslots in the overlap buffer: */ 120 ptr = hSbrDec->pSbrOverlapBuffer; 121 for(slot=0; slot<hSbrDec->LppTrans.pSettings->overlap; slot++) { 122 QmfBufferReal[slot] = ptr; ptr += (64); 123 } 124 125 /* Assign timeslots to Workbuffer1 */ 126 ptr = hSbrDec->WorkBuffer1; 127 for(i=0; i<noCols; i++) { 128 QmfBufferReal[slot] = ptr; ptr += (64); 129 slot++; 130 } 131 } 132 133 134 static void assignHqTimeSlots( HANDLE_SBR_DEC hSbrDec, /*!< handle to Decoder channel */ 135 FIXP_DBL **QmfBufferReal, 136 FIXP_DBL **QmfBufferImag, 137 int noCols ) 138 { 139 FIXP_DBL *ptr; 140 int slot; 141 142 /* Number of QMF timeslots in one half of a frame (size of Workbuffer1 or 2): */ 143 int halflen = (noCols >> 1) + hSbrDec->LppTrans.pSettings->overlap; 144 int totCols = noCols + hSbrDec->LppTrans.pSettings->overlap; 145 146 /* Number of QMF timeslots in the overlap buffer: */ 147 ptr = hSbrDec->pSbrOverlapBuffer; 148 for(slot=0; slot<hSbrDec->LppTrans.pSettings->overlap; slot++) { 149 QmfBufferReal[slot] = ptr; ptr += (64); 150 QmfBufferImag[slot] = ptr; ptr += (64); 151 } 152 153 /* Assign first half of timeslots to Workbuffer1 */ 154 ptr = hSbrDec->WorkBuffer1; 155 for(; slot<halflen; slot++) { 156 QmfBufferReal[slot] = ptr; ptr += (64); 157 QmfBufferImag[slot] = ptr; ptr += (64); 158 } 159 160 /* Assign second half of timeslots to Workbuffer2 */ 161 ptr = hSbrDec->WorkBuffer2; 162 for(; slot<totCols; slot++) { 163 QmfBufferReal[slot] = ptr; ptr += (64); 164 QmfBufferImag[slot] = ptr; ptr += (64); 165 } 166 } 167 168 169 static void assignTimeSlots( HANDLE_SBR_DEC hSbrDec, /*!< handle to Decoder channel */ 170 int noCols, 171 int useLP ) 172 { 173 /* assign qmf time slots */ 174 hSbrDec->useLP = useLP; 175 if (useLP) { 176 hSbrDec->SynthesisQMF.flags |= QMF_FLAG_LP; 177 hSbrDec->AnalysiscQMF.flags |= QMF_FLAG_LP; 178 } else { 179 hSbrDec->SynthesisQMF.flags &= ~QMF_FLAG_LP; 180 hSbrDec->AnalysiscQMF.flags &= ~QMF_FLAG_LP; 181 } 182 if (!useLP) 183 assignHqTimeSlots( hSbrDec, hSbrDec->QmfBufferReal, hSbrDec->QmfBufferImag, noCols ); 184 else 185 { 186 assignLcTimeSlots( hSbrDec, hSbrDec->QmfBufferReal, noCols ); 187 } 188 } 189 190 static void changeQmfType( HANDLE_SBR_DEC hSbrDec, /*!< handle to Decoder channel */ 191 int useLdTimeAlign ) 192 { 193 UINT synQmfFlags = hSbrDec->SynthesisQMF.flags; 194 UINT anaQmfFlags = hSbrDec->AnalysiscQMF.flags; 195 int resetSynQmf = 0; 196 int resetAnaQmf = 0; 197 198 /* assign qmf type */ 199 if (useLdTimeAlign) { 200 if (synQmfFlags & QMF_FLAG_CLDFB) { 201 /* change the type to MPSLD */ 202 synQmfFlags &= ~QMF_FLAG_CLDFB; 203 synQmfFlags |= QMF_FLAG_MPSLDFB; 204 resetSynQmf = 1; 205 } 206 if (anaQmfFlags & QMF_FLAG_CLDFB) { 207 /* change the type to MPSLD */ 208 anaQmfFlags &= ~QMF_FLAG_CLDFB; 209 anaQmfFlags |= QMF_FLAG_MPSLDFB; 210 resetAnaQmf = 1; 211 } 212 } else { 213 if (synQmfFlags & QMF_FLAG_MPSLDFB) { 214 /* change the type to CLDFB */ 215 synQmfFlags &= ~QMF_FLAG_MPSLDFB; 216 synQmfFlags |= QMF_FLAG_CLDFB; 217 resetSynQmf = 1; 218 } 219 if (anaQmfFlags & QMF_FLAG_MPSLDFB) { 220 /* change the type to CLDFB */ 221 anaQmfFlags &= ~QMF_FLAG_MPSLDFB; 222 anaQmfFlags |= QMF_FLAG_CLDFB; 223 resetAnaQmf = 1; 224 } 225 } 226 227 if (resetAnaQmf) { 228 int qmfErr = qmfInitAnalysisFilterBank ( 229 &hSbrDec->AnalysiscQMF, 230 hSbrDec->anaQmfStates, 231 hSbrDec->AnalysiscQMF.no_col, 232 hSbrDec->AnalysiscQMF.lsb, 233 hSbrDec->AnalysiscQMF.usb, 234 hSbrDec->AnalysiscQMF.no_channels, 235 anaQmfFlags | QMF_FLAG_KEEP_STATES 236 ); 237 if (qmfErr != 0) { 238 FDK_ASSERT(0); 239 } 240 } 241 242 if (resetSynQmf) { 243 int qmfErr = qmfInitSynthesisFilterBank ( 244 &hSbrDec->SynthesisQMF, 245 hSbrDec->pSynQmfStates, 246 hSbrDec->SynthesisQMF.no_col, 247 hSbrDec->SynthesisQMF.lsb, 248 hSbrDec->SynthesisQMF.usb, 249 hSbrDec->SynthesisQMF.no_channels, 250 synQmfFlags | QMF_FLAG_KEEP_STATES 251 ); 252 253 if (qmfErr != 0) { 254 FDK_ASSERT(0); 255 } 256 } 257 } 258 259 260 /*! 261 \brief SBR decoder core function for one channel 262 263 \image html BufferMgmtDetailed-1632.png 264 265 Besides the filter states of the QMF filter bank and the LPC-states of 266 the LPP-Transposer, processing is mainly based on four buffers: 267 #timeIn, #timeOut, #WorkBuffer2 and #OverlapBuffer. The #WorkBuffer2 268 is reused for all channels and might be used by the core decoder, a 269 static overlap buffer is required for each channel. Du to in-place 270 processing, #timeIn and #timeOut point to identical locations. 271 272 The spectral data is organized in so-called slots, each slot 273 containing 64 bands of complex data. The number of slots per frame is 274 dependend on the frame size. For mp3PRO, there are 18 slots per frame 275 and 6 slots per #OverlapBuffer. It is not necessary to have the slots 276 in located consecutive address ranges. 277 278 To optimize memory usage and to minimize the number of memory 279 accesses, the memory management is organized as follows (Slot numbers 280 based on mp3PRO): 281 282 1.) Input time domain signal is located in #timeIn, the last slots 283 (0..5) of the spectral data of the previous frame are located in the 284 #OverlapBuffer. In addition, #frameData of the current frame resides 285 in the upper part of #timeIn. 286 287 2.) During the cplxAnalysisQmfFiltering(), 32 samples from #timeIn are transformed 288 into a slot of up to 32 complex spectral low band values at a 289 time. The first spectral slot -- nr. 6 -- is written at slot number 290 zero of #WorkBuffer2. #WorkBuffer2 will be completely filled with 291 spectral data. 292 293 3.) LPP-Transposition in lppTransposer() is processed on 24 slots. During the 294 transposition, the high band part of the spectral data is replicated 295 based on the low band data. 296 297 Envelope Adjustment is processed on the high band part of the spectral 298 data only by calculateSbrEnvelope(). 299 300 4.) The cplxSynthesisQmfFiltering() creates 64 time domain samples out 301 of a slot of 64 complex spectral values at a time. The first 6 slots 302 in #timeOut are filled from the results of spectral slots 0..5 in the 303 #OverlapBuffer. The consecutive slots in timeOut are now filled with 304 the results of spectral slots 6..17. 305 306 5.) The preprocessed slots 18..23 have to be stored in the 307 #OverlapBuffer. 308 309 */ 310 311 void 312 sbr_dec ( HANDLE_SBR_DEC hSbrDec, /*!< handle to Decoder channel */ 313 INT_PCM *timeIn, /*!< pointer to input time signal */ 314 INT_PCM *timeOut, /*!< pointer to output time signal */ 315 HANDLE_SBR_DEC hSbrDecRight, /*!< handle to Decoder channel right */ 316 INT_PCM *timeOutRight, /*!< pointer to output time signal */ 317 const int strideIn, /*!< Time data traversal strideIn */ 318 const int strideOut, /*!< Time data traversal strideOut */ 319 HANDLE_SBR_HEADER_DATA hHeaderData,/*!< Static control data */ 320 HANDLE_SBR_FRAME_DATA hFrameData, /*!< Control data of current frame */ 321 HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData, /*!< Some control data of last frame */ 322 const int applyProcessing, /*!< Flag for SBR operation */ 323 HANDLE_PS_DEC h_ps_d, 324 const UINT flags 325 ) 326 { 327 int i, slot, reserve; 328 int saveLbScale; 329 int ov_len; 330 int lastSlotOffs; 331 FIXP_DBL maxVal; 332 333 /* 1+1/3 frames of spectral data: */ 334 FIXP_DBL **QmfBufferReal = hSbrDec->QmfBufferReal; 335 FIXP_DBL **QmfBufferImag = hSbrDec->QmfBufferImag; 336 337 /* Number of QMF timeslots in the overlap buffer: */ 338 ov_len = hSbrDec->LppTrans.pSettings->overlap; 339 340 /* Number of QMF slots per frame */ 341 int noCols = hHeaderData->numberTimeSlots * hHeaderData->timeStep; 342 343 /* assign qmf time slots */ 344 if ( ((flags & SBRDEC_LOW_POWER ) ? 1 : 0) != ((hSbrDec->SynthesisQMF.flags & QMF_FLAG_LP) ? 1 : 0) ) { 345 assignTimeSlots( hSbrDec, hHeaderData->numberTimeSlots * hHeaderData->timeStep, flags & SBRDEC_LOW_POWER); 346 } 347 348 if (flags & SBRDEC_ELD_GRID) { 349 /* Choose the right low delay filter bank */ 350 changeQmfType( hSbrDec, (flags & SBRDEC_LD_MPS_QMF) ? 1 : 0 ); 351 } 352 353 /* 354 low band codec signal subband filtering 355 */ 356 357 { 358 C_AALLOC_SCRATCH_START(qmfTemp, FIXP_DBL, 2*(64)); 359 360 qmfAnalysisFiltering( &hSbrDec->AnalysiscQMF, 361 QmfBufferReal + ov_len, 362 QmfBufferImag + ov_len, 363 &hSbrDec->sbrScaleFactor, 364 timeIn, 365 strideIn, 366 qmfTemp 367 ); 368 369 C_AALLOC_SCRATCH_END(qmfTemp, FIXP_DBL, 2*(64)); 370 } 371 372 /* 373 Clear upper half of spectrum 374 */ 375 { 376 int nAnalysisBands = hHeaderData->numberOfAnalysisBands; 377 378 if (! (flags & SBRDEC_LOW_POWER)) { 379 for (slot = ov_len; slot < noCols+ov_len; slot++) { 380 FDKmemclear(&QmfBufferReal[slot][nAnalysisBands],((64)-nAnalysisBands)*sizeof(FIXP_DBL)); 381 FDKmemclear(&QmfBufferImag[slot][nAnalysisBands],((64)-nAnalysisBands)*sizeof(FIXP_DBL)); 382 } 383 } else 384 for (slot = ov_len; slot < noCols+ov_len; slot++) { 385 FDKmemclear(&QmfBufferReal[slot][nAnalysisBands],((64)-nAnalysisBands)*sizeof(FIXP_DBL)); 386 } 387 } 388 389 390 391 /* 392 Shift spectral data left to gain accuracy in transposer and adjustor 393 */ 394 maxVal = maxSubbandSample( QmfBufferReal, 395 (flags & SBRDEC_LOW_POWER) ? NULL : QmfBufferImag, 396 0, 397 hSbrDec->AnalysiscQMF.lsb, 398 ov_len, 399 noCols+ov_len ); 400 401 reserve = fixMax(0,CntLeadingZeros(maxVal)-1) ; 402 reserve = fixMin(reserve,DFRACT_BITS-1-hSbrDec->sbrScaleFactor.lb_scale); 403 404 /* If all data is zero, lb_scale could become too large */ 405 rescaleSubbandSamples( QmfBufferReal, 406 (flags & SBRDEC_LOW_POWER) ? NULL : QmfBufferImag, 407 0, 408 hSbrDec->AnalysiscQMF.lsb, 409 ov_len, 410 noCols+ov_len, 411 reserve); 412 413 hSbrDec->sbrScaleFactor.lb_scale += reserve; 414 415 /* 416 save low band scale, wavecoding or parametric stereo may modify it 417 */ 418 saveLbScale = hSbrDec->sbrScaleFactor.lb_scale; 419 420 421 if (applyProcessing) 422 { 423 UCHAR * borders = hFrameData->frameInfo.borders; 424 lastSlotOffs = borders[hFrameData->frameInfo.nEnvelopes] - hHeaderData->numberTimeSlots; 425 426 FIXP_DBL degreeAlias[(64)]; 427 428 /* The transposer will override most values in degreeAlias[]. 429 The array needs to be cleared at least from lowSubband to highSubband before. */ 430 if (flags & SBRDEC_LOW_POWER) 431 FDKmemclear(°reeAlias[hHeaderData->freqBandData.lowSubband], (hHeaderData->freqBandData.highSubband-hHeaderData->freqBandData.lowSubband)*sizeof(FIXP_DBL)); 432 433 /* 434 Inverse filtering of lowband and transposition into the SBR-frequency range 435 */ 436 437 lppTransposer ( &hSbrDec->LppTrans, 438 &hSbrDec->sbrScaleFactor, 439 QmfBufferReal, 440 degreeAlias, // only used if useLP = 1 441 QmfBufferImag, 442 flags & SBRDEC_LOW_POWER, 443 hHeaderData->timeStep, 444 borders[0], 445 lastSlotOffs, 446 hHeaderData->freqBandData.nInvfBands, 447 hFrameData->sbr_invf_mode, 448 hPrevFrameData->sbr_invf_mode ); 449 450 451 452 453 454 /* 455 Adjust envelope of current frame. 456 */ 457 458 calculateSbrEnvelope (&hSbrDec->sbrScaleFactor, 459 &hSbrDec->SbrCalculateEnvelope, 460 hHeaderData, 461 hFrameData, 462 QmfBufferReal, 463 QmfBufferImag, 464 flags & SBRDEC_LOW_POWER, 465 466 degreeAlias, 467 flags, 468 (hHeaderData->frameErrorFlag || hPrevFrameData->frameErrorFlag)); 469 470 471 /* 472 Update hPrevFrameData (to be used in the next frame) 473 */ 474 for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) { 475 hPrevFrameData->sbr_invf_mode[i] = hFrameData->sbr_invf_mode[i]; 476 } 477 hPrevFrameData->coupling = hFrameData->coupling; 478 hPrevFrameData->stopPos = borders[hFrameData->frameInfo.nEnvelopes]; 479 hPrevFrameData->ampRes = hFrameData->ampResolutionCurrentFrame; 480 } 481 else { 482 /* Reset hb_scale if no highband is present, because hb_scale is considered in the QMF-synthesis */ 483 hSbrDec->sbrScaleFactor.hb_scale = saveLbScale; 484 } 485 486 487 for (i=0; i<LPC_ORDER; i++){ 488 /* 489 Store the unmodified qmf Slots values (required for LPC filtering) 490 */ 491 if (! (flags & SBRDEC_LOW_POWER)) { 492 FDKmemcpy(hSbrDec->LppTrans.lpcFilterStatesReal[i], QmfBufferReal[noCols-LPC_ORDER+i], hSbrDec->AnalysiscQMF.lsb*sizeof(FIXP_DBL)); 493 FDKmemcpy(hSbrDec->LppTrans.lpcFilterStatesImag[i], QmfBufferImag[noCols-LPC_ORDER+i], hSbrDec->AnalysiscQMF.lsb*sizeof(FIXP_DBL)); 494 } else 495 FDKmemcpy(hSbrDec->LppTrans.lpcFilterStatesReal[i], QmfBufferReal[noCols-LPC_ORDER+i], hSbrDec->AnalysiscQMF.lsb*sizeof(FIXP_DBL)); 496 } 497 498 /* 499 Synthesis subband filtering. 500 */ 501 502 if ( ! (flags & SBRDEC_PS_DECODED) ) { 503 504 { 505 int outScalefactor = 0; 506 507 if (h_ps_d != NULL) { 508 h_ps_d->procFrameBased = 1; /* we here do frame based processing */ 509 } 510 511 512 sbrDecoder_drcApply(&hSbrDec->sbrDrcChannel, 513 QmfBufferReal, 514 (flags & SBRDEC_LOW_POWER) ? NULL : QmfBufferImag, 515 hSbrDec->SynthesisQMF.no_col, 516 &outScalefactor 517 ); 518 519 520 521 qmfChangeOutScalefactor(&hSbrDec->SynthesisQMF, outScalefactor ); 522 523 { 524 C_AALLOC_SCRATCH_START(qmfTemp, FIXP_DBL, 2*(64)); 525 526 qmfSynthesisFiltering( &hSbrDec->SynthesisQMF, 527 QmfBufferReal, 528 (flags & SBRDEC_LOW_POWER) ? NULL : QmfBufferImag, 529 &hSbrDec->sbrScaleFactor, 530 hSbrDec->LppTrans.pSettings->overlap, 531 timeOut, 532 strideOut, 533 qmfTemp); 534 535 C_AALLOC_SCRATCH_END(qmfTemp, FIXP_DBL, 2*(64)); 536 } 537 538 } 539 540 } else { /* (flags & SBRDEC_PS_DECODED) */ 541 INT i, sdiff, outScalefactor, scaleFactorLowBand, scaleFactorHighBand; 542 SCHAR scaleFactorLowBand_ov, scaleFactorLowBand_no_ov; 543 544 HANDLE_QMF_FILTER_BANK synQmf = &hSbrDec->SynthesisQMF; 545 HANDLE_QMF_FILTER_BANK synQmfRight = &hSbrDecRight->SynthesisQMF; 546 547 /* adapt scaling */ 548 sdiff = hSbrDec->sbrScaleFactor.lb_scale - reserve; /* Scaling difference */ 549 scaleFactorHighBand = sdiff - hSbrDec->sbrScaleFactor.hb_scale; /* Scale of current high band */ 550 scaleFactorLowBand_ov = sdiff - hSbrDec->sbrScaleFactor.ov_lb_scale; /* Scale of low band overlapping QMF data */ 551 scaleFactorLowBand_no_ov = sdiff - hSbrDec->sbrScaleFactor.lb_scale; /* Scale of low band current QMF data */ 552 outScalefactor = 0; /* Initial output scale */ 553 554 if (h_ps_d->procFrameBased == 1) /* If we have switched from frame to slot based processing copy filter states */ 555 { /* procFrameBased will be unset later */ 556 /* copy filter states from left to right */ 557 FDKmemcpy(synQmfRight->FilterStates, synQmf->FilterStates, ((640)-(64))*sizeof(FIXP_QSS)); 558 } 559 560 /* scale ALL qmf vales ( real and imag ) of mono / left channel to the 561 same scale factor ( ov_lb_sf, lb_sf and hq_sf ) */ 562 scalFilterBankValues( h_ps_d, /* parametric stereo decoder handle */ 563 QmfBufferReal, /* qmf filterbank values */ 564 QmfBufferImag, /* qmf filterbank values */ 565 synQmf->lsb, /* sbr start subband */ 566 hSbrDec->sbrScaleFactor.ov_lb_scale, 567 hSbrDec->sbrScaleFactor.lb_scale, 568 &scaleFactorLowBand_ov, /* adapt scaling values */ 569 &scaleFactorLowBand_no_ov, /* adapt scaling values */ 570 hSbrDec->sbrScaleFactor.hb_scale, /* current frame ( highband ) */ 571 &scaleFactorHighBand, 572 synQmf->no_col); 573 574 /* use the same synthese qmf values for left and right channel */ 575 synQmfRight->no_col = synQmf->no_col; 576 synQmfRight->lsb = synQmf->lsb; 577 synQmfRight->usb = synQmf->usb; 578 579 int env=0; 580 581 outScalefactor += (SCAL_HEADROOM+1); /* psDiffScale! */ 582 583 { 584 C_AALLOC_SCRATCH_START(pWorkBuffer, FIXP_DBL, 2*(64)); 585 586 int maxShift = 0; 587 588 if (hSbrDec->sbrDrcChannel.enable != 0) { 589 if (hSbrDec->sbrDrcChannel.prevFact_exp > maxShift) { 590 maxShift = hSbrDec->sbrDrcChannel.prevFact_exp; 591 } 592 if (hSbrDec->sbrDrcChannel.currFact_exp > maxShift) { 593 maxShift = hSbrDec->sbrDrcChannel.currFact_exp; 594 } 595 if (hSbrDec->sbrDrcChannel.nextFact_exp > maxShift) { 596 maxShift = hSbrDec->sbrDrcChannel.nextFact_exp; 597 } 598 } 599 600 /* copy DRC data to right channel (with PS both channels use the same DRC gains) */ 601 FDKmemcpy(&hSbrDecRight->sbrDrcChannel, &hSbrDec->sbrDrcChannel, sizeof(SBRDEC_DRC_CHANNEL)); 602 603 for (i = 0; i < synQmf->no_col; i++) { /* ----- no_col loop ----- */ 604 605 INT outScalefactorR, outScalefactorL; 606 outScalefactorR = outScalefactorL = outScalefactor; 607 608 /* qmf timeslot of right channel */ 609 FIXP_DBL* rQmfReal = pWorkBuffer; 610 FIXP_DBL* rQmfImag = pWorkBuffer + 64; 611 612 613 { 614 if ( i == h_ps_d->bsData[h_ps_d->processSlot].mpeg.aEnvStartStop[env] ) { 615 initSlotBasedRotation( h_ps_d, env, hHeaderData->freqBandData.highSubband ); 616 env++; 617 } 618 619 ApplyPsSlot( h_ps_d, /* parametric stereo decoder handle */ 620 (QmfBufferReal + i), /* one timeslot of left/mono channel */ 621 (QmfBufferImag + i), /* one timeslot of left/mono channel */ 622 rQmfReal, /* one timeslot or right channel */ 623 rQmfImag); /* one timeslot or right channel */ 624 } 625 626 627 scaleFactorLowBand = (i<(6)) ? scaleFactorLowBand_ov : scaleFactorLowBand_no_ov; 628 629 630 sbrDecoder_drcApplySlot ( /* right channel */ 631 &hSbrDecRight->sbrDrcChannel, 632 rQmfReal, 633 rQmfImag, 634 i, 635 synQmfRight->no_col, 636 maxShift 637 ); 638 639 outScalefactorR += maxShift; 640 641 sbrDecoder_drcApplySlot ( /* left channel */ 642 &hSbrDec->sbrDrcChannel, 643 *(QmfBufferReal + i), 644 *(QmfBufferImag + i), 645 i, 646 synQmf->no_col, 647 maxShift 648 ); 649 650 outScalefactorL += maxShift; 651 652 653 /* scale filter states for left and right channel */ 654 qmfChangeOutScalefactor( synQmf, outScalefactorL ); 655 qmfChangeOutScalefactor( synQmfRight, outScalefactorR ); 656 657 { 658 659 qmfSynthesisFilteringSlot( synQmfRight, 660 rQmfReal, /* QMF real buffer */ 661 rQmfImag, /* QMF imag buffer */ 662 scaleFactorLowBand, 663 scaleFactorHighBand, 664 timeOutRight+(i*synQmf->no_channels*strideOut), 665 strideOut, 666 pWorkBuffer); 667 668 qmfSynthesisFilteringSlot( synQmf, 669 *(QmfBufferReal + i), /* QMF real buffer */ 670 *(QmfBufferImag + i), /* QMF imag buffer */ 671 scaleFactorLowBand, 672 scaleFactorHighBand, 673 timeOut+(i*synQmf->no_channels*strideOut), 674 strideOut, 675 pWorkBuffer); 676 677 } 678 } /* no_col loop i */ 679 680 /* scale back (6) timeslots look ahead for hybrid filterbank to original value */ 681 rescalFilterBankValues( h_ps_d, 682 QmfBufferReal, 683 QmfBufferImag, 684 synQmf->lsb, 685 synQmf->no_col ); 686 687 C_AALLOC_SCRATCH_END(pWorkBuffer, FIXP_DBL, 2*(64)); 688 } 689 } 690 691 sbrDecoder_drcUpdateChannel( &hSbrDec->sbrDrcChannel ); 692 693 694 /* 695 Update overlap buffer 696 Even bands above usb are copied to avoid outdated spectral data in case 697 the stop frequency raises. 698 */ 699 700 if (hSbrDec->LppTrans.pSettings->overlap > 0) 701 { 702 if (! (flags & SBRDEC_LOW_POWER)) { 703 for ( i=0; i<hSbrDec->LppTrans.pSettings->overlap; i++ ) { 704 FDKmemcpy(QmfBufferReal[i], QmfBufferReal[i+noCols], (64)*sizeof(FIXP_DBL)); 705 FDKmemcpy(QmfBufferImag[i], QmfBufferImag[i+noCols], (64)*sizeof(FIXP_DBL)); 706 } 707 } else 708 for ( i=0; i<hSbrDec->LppTrans.pSettings->overlap; i++ ) { 709 FDKmemcpy(QmfBufferReal[i], QmfBufferReal[i+noCols], (64)*sizeof(FIXP_DBL)); 710 } 711 } 712 713 hSbrDec->sbrScaleFactor.ov_lb_scale = saveLbScale; 714 715 /* Save current frame status */ 716 hPrevFrameData->frameErrorFlag = hHeaderData->frameErrorFlag; 717 718 } // sbr_dec() 719 720 721 /*! 722 \brief Creates sbr decoder structure 723 \return errorCode, 0 if successful 724 */ 725 SBR_ERROR 726 createSbrDec (SBR_CHANNEL * hSbrChannel, 727 HANDLE_SBR_HEADER_DATA hHeaderData, /*!< Static control data */ 728 TRANSPOSER_SETTINGS *pSettings, 729 const int downsampleFac, /*!< Downsampling factor */ 730 const UINT qmfFlags, /*!< flags -> 1: HQ/LP selector, 2: CLDFB */ 731 const UINT flags, 732 const int overlap, 733 int chan) /*!< Channel for which to assign buffers etc. */ 734 735 { 736 SBR_ERROR err = SBRDEC_OK; 737 int timeSlots = hHeaderData->numberTimeSlots; /* Number of SBR slots per frame */ 738 int noCols = timeSlots * hHeaderData->timeStep; /* Number of QMF slots per frame */ 739 HANDLE_SBR_DEC hs = &(hSbrChannel->SbrDec); 740 741 /* Initialize scale factors */ 742 hs->sbrScaleFactor.ov_lb_scale = 0; 743 hs->sbrScaleFactor.ov_hb_scale = 0; 744 hs->sbrScaleFactor.hb_scale = 0; 745 746 747 /* 748 create envelope calculator 749 */ 750 err = createSbrEnvelopeCalc (&hs->SbrCalculateEnvelope, 751 hHeaderData, 752 chan, 753 flags); 754 if (err != SBRDEC_OK) { 755 return err; 756 } 757 758 /* 759 create QMF filter banks 760 */ 761 { 762 int qmfErr; 763 /* Adapted QMF analysis post-twiddles for down-sampled HQ SBR */ 764 const UINT downSampledFlag = (downsampleFac==2) ? QMF_FLAG_DOWNSAMPLED : 0; 765 766 qmfErr = qmfInitAnalysisFilterBank ( 767 &hs->AnalysiscQMF, 768 hs->anaQmfStates, 769 noCols, 770 hHeaderData->freqBandData.lowSubband, 771 hHeaderData->freqBandData.highSubband, 772 hHeaderData->numberOfAnalysisBands, 773 (qmfFlags & (~QMF_FLAG_KEEP_STATES)) | downSampledFlag 774 ); 775 if (qmfErr != 0) { 776 return SBRDEC_UNSUPPORTED_CONFIG; 777 } 778 } 779 if (hs->pSynQmfStates == NULL) { 780 hs->pSynQmfStates = GetRam_sbr_QmfStatesSynthesis(chan); 781 if (hs->pSynQmfStates == NULL) 782 return SBRDEC_MEM_ALLOC_FAILED; 783 } 784 785 { 786 int qmfErr; 787 788 qmfErr = qmfInitSynthesisFilterBank ( 789 &hs->SynthesisQMF, 790 hs->pSynQmfStates, 791 noCols, 792 hHeaderData->freqBandData.lowSubband, 793 hHeaderData->freqBandData.highSubband, 794 (64) / downsampleFac, 795 qmfFlags & (~QMF_FLAG_KEEP_STATES) 796 ); 797 798 if (qmfErr != 0) { 799 return SBRDEC_UNSUPPORTED_CONFIG; 800 } 801 } 802 initSbrPrevFrameData (&hSbrChannel->prevFrameData, timeSlots); 803 804 /* 805 create transposer 806 */ 807 err = createLppTransposer (&hs->LppTrans, 808 pSettings, 809 hHeaderData->freqBandData.lowSubband, 810 hHeaderData->freqBandData.v_k_master, 811 hHeaderData->freqBandData.numMaster, 812 hs->SynthesisQMF.usb, 813 timeSlots, 814 hs->AnalysiscQMF.no_col, 815 hHeaderData->freqBandData.freqBandTableNoise, 816 hHeaderData->freqBandData.nNfb, 817 hHeaderData->sbrProcSmplRate, 818 chan, 819 overlap ); 820 if (err != SBRDEC_OK) { 821 return err; 822 } 823 824 /* The CLDFB does not have overlap */ 825 if ((qmfFlags & QMF_FLAG_CLDFB) == 0) { 826 if (hs->pSbrOverlapBuffer == NULL) { 827 hs->pSbrOverlapBuffer = GetRam_sbr_OverlapBuffer(chan); 828 if (hs->pSbrOverlapBuffer == NULL) { 829 return SBRDEC_MEM_ALLOC_FAILED; 830 } 831 } else { 832 /* Clear overlap buffer */ 833 FDKmemclear( hs->pSbrOverlapBuffer, 834 sizeof(FIXP_DBL) * 2 * (6) * (64) 835 ); 836 } 837 } 838 839 /* assign qmf time slots */ 840 assignTimeSlots( &hSbrChannel->SbrDec, hHeaderData->numberTimeSlots * hHeaderData->timeStep, qmfFlags & QMF_FLAG_LP); 841 842 return err; 843 } 844 845 /*! 846 \brief Delete sbr decoder structure 847 \return errorCode, 0 if successful 848 */ 849 int 850 deleteSbrDec (SBR_CHANNEL * hSbrChannel) 851 { 852 HANDLE_SBR_DEC hs = &hSbrChannel->SbrDec; 853 854 deleteSbrEnvelopeCalc (&hs->SbrCalculateEnvelope); 855 856 /* delete QMF filter states */ 857 if (hs->pSynQmfStates != NULL) { 858 FreeRam_sbr_QmfStatesSynthesis(&hs->pSynQmfStates); 859 } 860 861 862 if (hs->pSbrOverlapBuffer != NULL) { 863 FreeRam_sbr_OverlapBuffer(&hs->pSbrOverlapBuffer); 864 } 865 866 return 0; 867 } 868 869 870 /*! 871 \brief resets sbr decoder structure 872 \return errorCode, 0 if successful 873 */ 874 SBR_ERROR 875 resetSbrDec (HANDLE_SBR_DEC hSbrDec, 876 HANDLE_SBR_HEADER_DATA hHeaderData, 877 HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData, 878 const int useLP, 879 const int downsampleFac 880 ) 881 { 882 SBR_ERROR sbrError = SBRDEC_OK; 883 884 int old_lsb = hSbrDec->SynthesisQMF.lsb; 885 int new_lsb = hHeaderData->freqBandData.lowSubband; 886 int l, startBand, stopBand, startSlot, size; 887 888 int source_scale, target_scale, delta_scale, target_lsb, target_usb, reserve; 889 FIXP_DBL maxVal; 890 891 /* overlapBuffer point to first (6) slots */ 892 FIXP_DBL **OverlapBufferReal = hSbrDec->QmfBufferReal; 893 FIXP_DBL **OverlapBufferImag = hSbrDec->QmfBufferImag; 894 895 /* assign qmf time slots */ 896 assignTimeSlots( hSbrDec, hHeaderData->numberTimeSlots * hHeaderData->timeStep, useLP); 897 898 899 900 resetSbrEnvelopeCalc (&hSbrDec->SbrCalculateEnvelope); 901 902 hSbrDec->SynthesisQMF.lsb = hHeaderData->freqBandData.lowSubband; 903 hSbrDec->SynthesisQMF.usb = fixMin((INT)hSbrDec->SynthesisQMF.no_channels, (INT)hHeaderData->freqBandData.highSubband); 904 905 hSbrDec->AnalysiscQMF.lsb = hSbrDec->SynthesisQMF.lsb; 906 hSbrDec->AnalysiscQMF.usb = hSbrDec->SynthesisQMF.usb; 907 908 909 /* 910 The following initialization of spectral data in the overlap buffer 911 is required for dynamic x-over or a change of the start-freq for 2 reasons: 912 913 1. If the lowband gets _wider_, unadjusted data would remain 914 915 2. If the lowband becomes _smaller_, the highest bands of the old lowband 916 must be cleared because the whitening would be affected 917 */ 918 startBand = old_lsb; 919 stopBand = new_lsb; 920 startSlot = hHeaderData->timeStep * (hPrevFrameData->stopPos - hHeaderData->numberTimeSlots); 921 size = fixMax(0,stopBand-startBand); 922 923 /* keep already adjusted data in the x-over-area */ 924 if (!useLP) { 925 for (l=startSlot; l<hSbrDec->LppTrans.pSettings->overlap; l++) { 926 FDKmemclear(&OverlapBufferReal[l][startBand], size*sizeof(FIXP_DBL)); 927 FDKmemclear(&OverlapBufferImag[l][startBand], size*sizeof(FIXP_DBL)); 928 } 929 } else 930 for (l=startSlot; l<hSbrDec->LppTrans.pSettings->overlap ; l++) { 931 FDKmemclear(&OverlapBufferReal[l][startBand], size*sizeof(FIXP_DBL)); 932 } 933 934 935 /* 936 reset LPC filter states 937 */ 938 startBand = fixMin(old_lsb,new_lsb); 939 stopBand = fixMax(old_lsb,new_lsb); 940 size = fixMax(0,stopBand-startBand); 941 942 FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesReal[0][startBand], size*sizeof(FIXP_DBL)); 943 FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesReal[1][startBand], size*sizeof(FIXP_DBL)); 944 if (!useLP) { 945 FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesImag[0][startBand], size*sizeof(FIXP_DBL)); 946 FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesImag[1][startBand], size*sizeof(FIXP_DBL)); 947 } 948 949 950 /* 951 Rescale already processed spectral data between old and new x-over frequency. 952 This must be done because of the separate scalefactors for lowband and highband. 953 */ 954 startBand = fixMin(old_lsb,new_lsb); 955 stopBand = fixMax(old_lsb,new_lsb); 956 957 if (new_lsb > old_lsb) { 958 /* The x-over-area was part of the highband before and will now belong to the lowband */ 959 source_scale = hSbrDec->sbrScaleFactor.ov_hb_scale; 960 target_scale = hSbrDec->sbrScaleFactor.ov_lb_scale; 961 target_lsb = 0; 962 target_usb = old_lsb; 963 } 964 else { 965 /* The x-over-area was part of the lowband before and will now belong to the highband */ 966 source_scale = hSbrDec->sbrScaleFactor.ov_lb_scale; 967 target_scale = hSbrDec->sbrScaleFactor.ov_hb_scale; 968 /* jdr: The values old_lsb and old_usb might be wrong because the previous frame might have been "upsamling". */ 969 target_lsb = hSbrDec->SynthesisQMF.lsb; 970 target_usb = hSbrDec->SynthesisQMF.usb; 971 } 972 973 /* Shift left all samples of the x-over-area as much as possible 974 An unnecessary coarse scale could cause ov_lb_scale or ov_hb_scale to be 975 adapted and the accuracy in the next frame would seriously suffer! */ 976 977 maxVal = maxSubbandSample( OverlapBufferReal, 978 (useLP) ? NULL : OverlapBufferImag, 979 startBand, 980 stopBand, 981 0, 982 startSlot); 983 984 reserve = CntLeadingZeros(maxVal)-1; 985 reserve = fixMin(reserve,DFRACT_BITS-1-source_scale); 986 987 rescaleSubbandSamples( OverlapBufferReal, 988 (useLP) ? NULL : OverlapBufferImag, 989 startBand, 990 stopBand, 991 0, 992 startSlot, 993 reserve); 994 source_scale += reserve; 995 996 delta_scale = target_scale - source_scale; 997 998 if (delta_scale > 0) { /* x-over-area is dominant */ 999 delta_scale = -delta_scale; 1000 startBand = target_lsb; 1001 stopBand = target_usb; 1002 1003 if (new_lsb > old_lsb) { 1004 /* The lowband has to be rescaled */ 1005 hSbrDec->sbrScaleFactor.ov_lb_scale = source_scale; 1006 } 1007 else { 1008 /* The highband has be be rescaled */ 1009 hSbrDec->sbrScaleFactor.ov_hb_scale = source_scale; 1010 } 1011 } 1012 1013 FDK_ASSERT(startBand <= stopBand); 1014 1015 if (!useLP) { 1016 for (l=0; l<startSlot; l++) { 1017 scaleValues( OverlapBufferReal[l] + startBand, stopBand-startBand, delta_scale ); 1018 scaleValues( OverlapBufferImag[l] + startBand, stopBand-startBand, delta_scale ); 1019 } 1020 } else 1021 for (l=0; l<startSlot; l++) { 1022 scaleValues( OverlapBufferReal[l] + startBand, stopBand-startBand, delta_scale ); 1023 } 1024 1025 1026 /* 1027 Initialize transposer and limiter 1028 */ 1029 sbrError = resetLppTransposer (&hSbrDec->LppTrans, 1030 hHeaderData->freqBandData.lowSubband, 1031 hHeaderData->freqBandData.v_k_master, 1032 hHeaderData->freqBandData.numMaster, 1033 hHeaderData->freqBandData.freqBandTableNoise, 1034 hHeaderData->freqBandData.nNfb, 1035 hHeaderData->freqBandData.highSubband, 1036 hHeaderData->sbrProcSmplRate); 1037 if (sbrError != SBRDEC_OK) 1038 return sbrError; 1039 1040 sbrError = ResetLimiterBands ( hHeaderData->freqBandData.limiterBandTable, 1041 &hHeaderData->freqBandData.noLimiterBands, 1042 hHeaderData->freqBandData.freqBandTable[0], 1043 hHeaderData->freqBandData.nSfb[0], 1044 hSbrDec->LppTrans.pSettings->patchParam, 1045 hSbrDec->LppTrans.pSettings->noOfPatches, 1046 hHeaderData->bs_data.limiterBands); 1047 1048 1049 return sbrError; 1050 } 1051
