1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung 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/***************************** MPEG-4 AAC Decoder ************************** 85 86 Author(s): Josef Hoepfl 87 Description: long/short-block decoding 88 89******************************************************************************/ 90 91#include "block.h" 92 93#include "aac_rom.h" 94#include "FDK_bitstream.h" 95#include "FDK_tools_rom.h" 96 97 98 99 100#include "aacdec_hcr.h" 101#include "rvlc.h" 102 103 104#if defined(__arm__) 105#include "arm/block_arm.cpp" 106#endif 107 108/*! 109 \brief Read escape sequence of codeword 110 111 The function reads the escape sequence from the bitstream, 112 if the absolute value of the quantized coefficient has the 113 value 16. 114 115 \return quantized coefficient 116*/ 117LONG CBlock_GetEscape(HANDLE_FDK_BITSTREAM bs, /*!< pointer to bitstream */ 118 const LONG q) /*!< quantized coefficient */ 119{ 120 LONG i, off, neg ; 121 122 if (q < 0) 123 { 124 if (q != -16) return q; 125 neg = 1; 126 } 127 else 128 { 129 if (q != +16) return q; 130 neg = 0; 131 } 132 133 for (i=4; ; i++) 134 { 135 if (FDKreadBits(bs,1) == 0) 136 break; 137 } 138 139 if (i > 16) 140 { 141 if (i - 16 > CACHE_BITS) { /* cannot read more than "CACHE_BITS" bits at once in the function FDKreadBits() */ 142 return (MAX_QUANTIZED_VALUE + 1); /* returning invalid value that will be captured later */ 143 } 144 145 off = FDKreadBits(bs,i-16) << 16; 146 off |= FDKreadBits(bs,16); 147 } 148 else 149 { 150 off = FDKreadBits(bs,i); 151 } 152 153 i = off + (1 << i); 154 155 if (neg) i = -i; 156 157 return i; 158} 159 160AAC_DECODER_ERROR CBlock_ReadScaleFactorData( 161 CAacDecoderChannelInfo *pAacDecoderChannelInfo, 162 HANDLE_FDK_BITSTREAM bs, 163 UINT flags 164 ) 165{ 166 int temp; 167 int band; 168 int group; 169 int position = 0; /* accu for intensity delta coding */ 170 int factor = pAacDecoderChannelInfo->pDynData->RawDataInfo.GlobalGain; /* accu for scale factor delta coding */ 171 UCHAR *pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook; 172 SHORT *pScaleFactor = pAacDecoderChannelInfo->pDynData->aScaleFactor; 173 const CodeBookDescription *hcb =&AACcodeBookDescriptionTable[BOOKSCL]; 174 175 int ScaleFactorBandsTransmitted = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo); 176 for (group=0; group < GetWindowGroups(&pAacDecoderChannelInfo->icsInfo); group++) 177 { 178 for (band=0; band < ScaleFactorBandsTransmitted; band++) 179 { 180 switch (pCodeBook[group*16+band]) { 181 182 case ZERO_HCB: /* zero book */ 183 pScaleFactor[group*16+band] = 0; 184 break; 185 186 default: /* decode scale factor */ 187 { 188 temp = CBlock_DecodeHuffmanWord(bs,hcb); 189 factor += temp - 60; /* MIDFAC 1.5 dB */ 190 } 191 pScaleFactor[group*16+band] = factor - 100; 192 break; 193 194 case INTENSITY_HCB: /* intensity steering */ 195 case INTENSITY_HCB2: 196 temp = CBlock_DecodeHuffmanWord(bs,hcb); 197 position += temp - 60; 198 pScaleFactor[group*16+band] = position - 100; 199 break; 200 201 case NOISE_HCB: /* PNS */ 202 if (flags & (AC_MPS_RES|AC_USAC|AC_RSVD50)) { 203 return AAC_DEC_PARSE_ERROR; 204 } 205 CPns_Read( &pAacDecoderChannelInfo->data.aac.PnsData, bs, hcb, pAacDecoderChannelInfo->pDynData->aScaleFactor, pAacDecoderChannelInfo->pDynData->RawDataInfo.GlobalGain, band, group); 206 break; 207 } 208 } 209 } 210 211 return AAC_DEC_OK; 212} 213 214void CBlock_ScaleSpectralData(CAacDecoderChannelInfo *pAacDecoderChannelInfo, SamplingRateInfo *pSamplingRateInfo) 215{ 216 int band; 217 int window; 218 const SHORT * RESTRICT pSfbScale = pAacDecoderChannelInfo->pDynData->aSfbScale; 219 SHORT * RESTRICT pSpecScale = pAacDecoderChannelInfo->specScale; 220 int groupwin,group; 221 const SHORT * RESTRICT BandOffsets = GetScaleFactorBandOffsets(&pAacDecoderChannelInfo->icsInfo, pSamplingRateInfo); 222 SPECTRAL_PTR RESTRICT pSpectralCoefficient = pAacDecoderChannelInfo->pSpectralCoefficient; 223 224 225 FDKmemclear(pSpecScale, 8*sizeof(SHORT)); 226 227 int max_band = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo); 228 for (window=0, group=0; group < GetWindowGroups(&pAacDecoderChannelInfo->icsInfo); group++) 229 { 230 for (groupwin=0; groupwin < GetWindowGroupLength(&pAacDecoderChannelInfo->icsInfo,group); groupwin++, window++) 231 { 232 int SpecScale_window = pSpecScale[window]; 233 FIXP_DBL *pSpectrum = SPEC(pSpectralCoefficient, window, pAacDecoderChannelInfo->granuleLength); 234 235 /* find scaling for current window */ 236 for (band=0; band < max_band; band++) 237 { 238 SpecScale_window = fMax(SpecScale_window, (int)pSfbScale[window*16+band]); 239 } 240 241 if (pAacDecoderChannelInfo->pDynData->TnsData.Active) { 242 SpecScale_window += TNS_SCALE; 243 } 244 245 /* store scaling of current window */ 246 pSpecScale[window] = SpecScale_window; 247 248#ifdef FUNCTION_CBlock_ScaleSpectralData_func1 249 250 CBlock_ScaleSpectralData_func1(pSpectrum, max_band, BandOffsets, SpecScale_window, pSfbScale, window); 251 252#else /* FUNCTION_CBlock_ScaleSpectralData_func1 */ 253 for (band=0; band < max_band; band++) 254 { 255 int scale = SpecScale_window - pSfbScale[window*16+band]; 256 if (scale) 257 { 258 /* following relation can be used for optimizations: (BandOffsets[i]%4) == 0 for all i */ 259 int max_index = BandOffsets[band+1]; 260 for (int index = BandOffsets[band]; index < max_index; index++) 261 { 262 pSpectrum[index] >>= scale; 263 } 264 } 265 } 266#endif /* FUNCTION_CBlock_ScaleSpectralData_func1 */ 267 } 268 } 269 270} 271 272AAC_DECODER_ERROR CBlock_ReadSectionData(HANDLE_FDK_BITSTREAM bs, 273 CAacDecoderChannelInfo *pAacDecoderChannelInfo, 274 const SamplingRateInfo *pSamplingRateInfo, 275 const UINT flags) 276{ 277 int top, band; 278 int sect_len, sect_len_incr; 279 int group; 280 UCHAR sect_cb; 281 UCHAR *pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook; 282 /* HCR input (long) */ 283 SHORT *pNumLinesInSec = pAacDecoderChannelInfo->pDynData->specificTo.aac.aNumLineInSec4Hcr; 284 int numLinesInSecIdx = 0; 285 UCHAR *pHcrCodeBook = pAacDecoderChannelInfo->pDynData->specificTo.aac.aCodeBooks4Hcr; 286 const SHORT *BandOffsets = GetScaleFactorBandOffsets(&pAacDecoderChannelInfo->icsInfo, pSamplingRateInfo); 287 pAacDecoderChannelInfo->pDynData->specificTo.aac.numberSection = 0; 288 AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK; 289 290 FDKmemclear(pCodeBook, sizeof(UCHAR)*(8*16)); 291 292 const int nbits = (IsLongBlock(&pAacDecoderChannelInfo->icsInfo) == 1) ? 5 : 3; 293 294 int sect_esc_val = (1 << nbits) - 1 ; 295 296 UCHAR ScaleFactorBandsTransmitted = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo); 297 for (group=0; group<GetWindowGroups(&pAacDecoderChannelInfo->icsInfo); group++) 298 { 299 for (band=0; band < ScaleFactorBandsTransmitted; ) 300 { 301 sect_len = 0; 302 if ( flags & AC_ER_VCB11 ) { 303 sect_cb = (UCHAR) FDKreadBits(bs,5); 304 } 305 else 306 sect_cb = (UCHAR) FDKreadBits(bs,4); 307 308 if ( ((flags & AC_ER_VCB11) == 0) || ( sect_cb < 11 ) || ((sect_cb > 11) && (sect_cb < 16)) ) { 309 sect_len_incr = FDKreadBits(bs, nbits); 310 while (sect_len_incr == sect_esc_val) 311 { 312 sect_len += sect_esc_val; 313 sect_len_incr = FDKreadBits(bs, nbits); 314 } 315 } 316 else { 317 sect_len_incr = 1; 318 } 319 320 sect_len += sect_len_incr; 321 322 323 top = band + sect_len; 324 325 if (flags & AC_ER_HCR) { 326 /* HCR input (long) -- collecting sideinfo (for HCR-_long_ only) */ 327 pNumLinesInSec[numLinesInSecIdx] = BandOffsets[top] - BandOffsets[band]; 328 numLinesInSecIdx++; 329 if (numLinesInSecIdx >= MAX_SFB_HCR) { 330 return AAC_DEC_PARSE_ERROR; 331 } 332 if ( 333 (sect_cb == BOOKSCL) ) 334 { 335 return AAC_DEC_INVALID_CODE_BOOK; 336 } else { 337 *pHcrCodeBook++ = sect_cb; 338 } 339 pAacDecoderChannelInfo->pDynData->specificTo.aac.numberSection++; 340 } 341 342 /* Check spectral line limits */ 343 if (IsLongBlock( &(pAacDecoderChannelInfo->icsInfo) )) 344 { 345 if (top > 64) { 346 return AAC_DEC_DECODE_FRAME_ERROR; 347 } 348 } else { /* short block */ 349 if (top + group*16 > (8 * 16)) { 350 return AAC_DEC_DECODE_FRAME_ERROR; 351 } 352 } 353 354 /* Check if decoded codebook index is feasible */ 355 if ( (sect_cb == BOOKSCL) 356 || ( (sect_cb == INTENSITY_HCB || sect_cb == INTENSITY_HCB2) && pAacDecoderChannelInfo->pDynData->RawDataInfo.CommonWindow == 0) 357 ) 358 { 359 return AAC_DEC_INVALID_CODE_BOOK; 360 } 361 362 /* Store codebook index */ 363 for (; band < top; band++) 364 { 365 pCodeBook[group*16+band] = sect_cb; 366 } 367 } 368 } 369 370 371 return ErrorStatus; 372} 373 374/* mso: provides a faster way to i-quantize a whole band in one go */ 375 376/** 377 * \brief inverse quantize one sfb. Each value of the sfb is processed according to the 378 * formula: spectrum[i] = Sign(spectrum[i]) * Matissa(spectrum[i])^(4/3) * 2^(lsb/4). 379 * \param spectrum pointer to first line of the sfb to be inverse quantized. 380 * \param noLines number of lines belonging to the sfb. 381 * \param lsb last 2 bits of the scale factor of the sfb. 382 * \param scale max allowed shift scale for the sfb. 383 */ 384static 385void InverseQuantizeBand( FIXP_DBL * RESTRICT spectrum, 386 INT noLines, 387 INT lsb, 388 INT scale ) 389{ 390 const FIXP_DBL * RESTRICT InverseQuantTabler=(FIXP_DBL *)InverseQuantTable; 391 const FIXP_DBL * RESTRICT MantissaTabler=(FIXP_DBL *)MantissaTable[lsb]; 392 const SCHAR* RESTRICT ExponentTabler=(SCHAR*)ExponentTable[lsb]; 393 394 FIXP_DBL *ptr = spectrum; 395 FIXP_DBL signedValue; 396 397 FDK_ASSERT(noLines>2); 398 for (INT i=noLines; i--; ) 399 { 400 if ((signedValue = *ptr++) != FL2FXCONST_DBL(0)) 401 { 402 FIXP_DBL value = fAbs(signedValue); 403 UINT freeBits = CntLeadingZeros(value); 404 UINT exponent = 32 - freeBits; 405 406 UINT x = (UINT) (LONG)value << (INT) freeBits; 407 x <<= 1; /* shift out sign bit to avoid masking later on */ 408 UINT tableIndex = x >> 24; 409 x = (x >> 20) & 0x0F; 410 411 UINT r0=(UINT)(LONG)InverseQuantTabler[tableIndex+0]; 412 UINT r1=(UINT)(LONG)InverseQuantTabler[tableIndex+1]; 413 UINT temp= (r1 - r0)*x + (r0 << 4); 414 415 value = fMultDiv2((FIXP_DBL)temp, MantissaTabler[exponent]); 416 417 /* + 1 compensates fMultDiv2() */ 418 scaleValueInPlace(&value, scale + ExponentTabler[exponent] + 1); 419 420 signedValue = (signedValue < (FIXP_DBL)0) ? -value : value; 421 ptr[-1] = signedValue; 422 } 423 } 424} 425 426AAC_DECODER_ERROR CBlock_InverseQuantizeSpectralData(CAacDecoderChannelInfo *pAacDecoderChannelInfo, SamplingRateInfo *pSamplingRateInfo) 427{ 428 int window, group, groupwin, band; 429 int ScaleFactorBandsTransmitted = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo); 430 UCHAR *RESTRICT pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook; 431 SHORT *RESTRICT pSfbScale = pAacDecoderChannelInfo->pDynData->aSfbScale; 432 SHORT *RESTRICT pScaleFactor = pAacDecoderChannelInfo->pDynData->aScaleFactor; 433 const SHORT *RESTRICT BandOffsets = GetScaleFactorBandOffsets(&pAacDecoderChannelInfo->icsInfo, pSamplingRateInfo); 434 435 FDKmemclear(pAacDecoderChannelInfo->pDynData->aSfbScale, (8*16)*sizeof(SHORT)); 436 437 for (window=0, group=0; group < GetWindowGroups(&pAacDecoderChannelInfo->icsInfo); group++) 438 { 439 for (groupwin=0; groupwin < GetWindowGroupLength(&pAacDecoderChannelInfo->icsInfo,group); groupwin++, window++) 440 { 441 /* inverse quantization */ 442 for (band=0; band < ScaleFactorBandsTransmitted; band++) 443 { 444 FIXP_DBL *pSpectralCoefficient = SPEC(pAacDecoderChannelInfo->pSpectralCoefficient, window, pAacDecoderChannelInfo->granuleLength) + BandOffsets[band]; 445 446 int noLines = BandOffsets[band+1] - BandOffsets[band]; 447 int bnds = group*16+band; 448 int i; 449 450 if ((pCodeBook[bnds] == ZERO_HCB) 451 || (pCodeBook[bnds] == INTENSITY_HCB) 452 || (pCodeBook[bnds] == INTENSITY_HCB2) 453 ) 454 continue; 455 456 if (pCodeBook[bnds] == NOISE_HCB) 457 { 458 /* Leave headroom for PNS values. + 1 because ceil(log2(2^(0.25*3))) = 1, 459 worst case of additional headroom required because of the scalefactor. */ 460 pSfbScale[window*16+band] = (pScaleFactor [bnds] >> 2) + 1 ; 461 continue; 462 } 463 464 /* Find max spectral line value of the current sfb */ 465 FIXP_DBL locMax = (FIXP_DBL)0; 466 467 for (i = noLines; i-- ; ) { 468 /* Expensive memory access */ 469 locMax = fMax(fixp_abs(pSpectralCoefficient[i]), locMax); 470 } 471 472 /* Cheap robustness improvement - Do not remove!!! */ 473 if (fixp_abs(locMax) > (FIXP_DBL)MAX_QUANTIZED_VALUE) { 474 return AAC_DEC_DECODE_FRAME_ERROR; 475 } 476 477 /* 478 The inverse quantized spectral lines are defined by: 479 pSpectralCoefficient[i] = Sign(pSpectralCoefficient[i]) * 2^(0.25*pScaleFactor[bnds]) * pSpectralCoefficient[i]^(4/3) 480 This is equivalent to: 481 pSpectralCoefficient[i] = Sign(pSpectralCoefficient[i]) * (2^(pScaleFactor[bnds] % 4) * pSpectralCoefficient[i]^(4/3)) 482 pSpectralCoefficient_e[i] += pScaleFactor[bnds]/4 483 */ 484 { 485 int msb = pScaleFactor [bnds] >> 2 ; 486 int lsb = pScaleFactor [bnds] & 0x03 ; 487 488 int scale = GetScaleFromValue(locMax, lsb); 489 490 pSfbScale[window*16+band] = msb - scale; 491 InverseQuantizeBand(pSpectralCoefficient, noLines, lsb, scale); 492 } 493 } 494 } 495 } 496 497 498 return AAC_DEC_OK; 499} 500 501 502AAC_DECODER_ERROR CBlock_ReadSpectralData(HANDLE_FDK_BITSTREAM bs, 503 CAacDecoderChannelInfo *pAacDecoderChannelInfo, 504 const SamplingRateInfo *pSamplingRateInfo, 505 const UINT flags) 506{ 507 int i,index; 508 int window,group,groupwin,groupoffset,band; 509 UCHAR *RESTRICT pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook; 510 const SHORT *RESTRICT BandOffsets = GetScaleFactorBandOffsets(&pAacDecoderChannelInfo->icsInfo, pSamplingRateInfo); 511 512 SPECTRAL_PTR pSpectralCoefficient = pAacDecoderChannelInfo->pSpectralCoefficient; 513 FIXP_DBL locMax; 514 515 int ScaleFactorBandsTransmitted = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo); 516 517 FDK_ASSERT(BandOffsets != NULL); 518 519 FDKmemclear(pSpectralCoefficient, sizeof(SPECTRUM)); 520 521 if ( (flags & AC_ER_HCR) == 0 ) 522 { 523 groupoffset = 0; 524 525 /* plain huffman decoder short */ 526 for (group=0; group < GetWindowGroups(&pAacDecoderChannelInfo->icsInfo); group++) 527 { 528 for (band=0; band < ScaleFactorBandsTransmitted; band++) 529 { 530 int bnds = group*16+band; 531 UCHAR currentCB = pCodeBook[bnds]; 532 533 /* patch to run plain-huffman-decoder with vcb11 input codebooks (LAV-checking might be possible below using the virtual cb and a LAV-table) */ 534 if ((currentCB >= 16) && (currentCB <= 31)) { 535 pCodeBook[bnds] = currentCB = 11; 536 } 537 if ( !((currentCB == ZERO_HCB) 538 || (currentCB == NOISE_HCB) 539 || (currentCB == INTENSITY_HCB) 540 || (currentCB == INTENSITY_HCB2)) ) 541 { 542 const CodeBookDescription *hcb = &AACcodeBookDescriptionTable[currentCB]; 543 int step = hcb->Dimension; 544 int offset = hcb->Offset; 545 int bits = hcb->numBits; 546 int mask = (1<<bits)-1; 547 548 for (groupwin=0; groupwin < GetWindowGroupLength(&pAacDecoderChannelInfo->icsInfo,group); groupwin++) 549 { 550 window = groupoffset + groupwin; 551 552 FIXP_DBL *mdctSpectrum = SPEC(pSpectralCoefficient, window, pAacDecoderChannelInfo->granuleLength); 553 554 locMax = (FIXP_DBL)0 ; 555 556 for (index=BandOffsets[band]; index < BandOffsets[band+1]; index+=step) 557 { 558 int idx = CBlock_DecodeHuffmanWord(bs,hcb); 559 560 for (i=0; i<step; i++) { 561 FIXP_DBL tmp; 562 563 tmp = (FIXP_DBL)((idx & mask)-offset); 564 idx >>= bits; 565 566 if (offset == 0) { 567 if (tmp != FIXP_DBL(0)) 568 tmp = (FDKreadBits(bs,1))? -tmp : tmp; 569 } 570 mdctSpectrum[index+i] = tmp; 571 } 572 573 if (currentCB == ESCBOOK) 574 { 575 mdctSpectrum[index+0] = (FIXP_DBL)CBlock_GetEscape(bs, (LONG)mdctSpectrum[index+0]); 576 mdctSpectrum[index+1] = (FIXP_DBL)CBlock_GetEscape(bs, (LONG)mdctSpectrum[index+1]); 577 578 } 579 } 580 } 581 } 582 } 583 groupoffset += GetWindowGroupLength(&pAacDecoderChannelInfo->icsInfo,group); 584 } 585 /* plain huffman decoding (short) finished */ 586 } 587 /* HCR - Huffman Codeword Reordering short */ 588 else /* if ( flags & AC_ER_HCR ) */ 589 { 590 H_HCR_INFO hHcr = &pAacDecoderChannelInfo->pComData->overlay.aac.erHcrInfo; 591 int hcrStatus = 0; 592 int hcrConcealWholeFrame = 0; 593 594 /* advanced Huffman decoding starts here (HCR decoding :) */ 595 if ( pAacDecoderChannelInfo->pDynData->specificTo.aac.lenOfReorderedSpectralData != 0 ) { 596 597 /* HCR initialization short */ 598 hcrStatus = HcrInit(hHcr, pAacDecoderChannelInfo, pSamplingRateInfo, bs); 599 600 if (hcrStatus != 0) { 601#if HCR_ERROR_CONCEALMENT 602 hcrConcealWholeFrame = 1; 603 return AAC_DEC_DECODE_FRAME_ERROR; /* concealment is muting in the first step, therefore return now */ 604 // hcr decoding is not skipped because of returning above 605#else 606 return AAC_DEC_DECODE_FRAME_ERROR; 607#endif 608 } 609 610 /* HCR decoding short */ 611 hcrStatus = HcrDecoder(hHcr, pAacDecoderChannelInfo, pSamplingRateInfo, bs); 612 613 614#if HCR_ERROR_CONCEALMENT 615 HcrMuteErroneousLines(hHcr); 616#else 617 return AAC_DEC_DECODE_FRAME_ERROR; 618#endif /* HCR_ERROR_CONCEALMENT */ 619 620 FDKpushFor (bs, pAacDecoderChannelInfo->pDynData->specificTo.aac.lenOfReorderedSpectralData); 621 } 622 } 623 /* HCR - Huffman Codeword Reordering short finished */ 624 625 626 627 if ( IsLongBlock(&pAacDecoderChannelInfo->icsInfo) && !(flags & (AC_ELD|AC_SCALABLE)) ) 628 { 629 /* apply pulse data */ 630 CPulseData_Apply(&pAacDecoderChannelInfo->pDynData->specificTo.aac.PulseData, 631 GetScaleFactorBandOffsets(&pAacDecoderChannelInfo->icsInfo, pSamplingRateInfo), 632 SPEC_LONG(pSpectralCoefficient)); 633 } 634 635 636 return AAC_DEC_OK; 637} 638 639 640 641void ApplyTools ( CAacDecoderChannelInfo *pAacDecoderChannelInfo[], 642 const SamplingRateInfo *pSamplingRateInfo, 643 const UINT flags, 644 const int channel ) 645{ 646 647 if ( !(flags & (AC_USAC|AC_RSVD50|AC_MPS_RES)) ) { 648 CPns_Apply( 649 &pAacDecoderChannelInfo[channel]->data.aac.PnsData, 650 &pAacDecoderChannelInfo[channel]->icsInfo, 651 pAacDecoderChannelInfo[channel]->pSpectralCoefficient, 652 pAacDecoderChannelInfo[channel]->specScale, 653 pAacDecoderChannelInfo[channel]->pDynData->aScaleFactor, 654 pSamplingRateInfo, 655 pAacDecoderChannelInfo[channel]->granuleLength, 656 channel 657 ); 658 } 659 660 CTns_Apply ( 661 &pAacDecoderChannelInfo[channel]->pDynData->TnsData, 662 &pAacDecoderChannelInfo[channel]->icsInfo, 663 pAacDecoderChannelInfo[channel]->pSpectralCoefficient, 664 pSamplingRateInfo, 665 pAacDecoderChannelInfo[channel]->granuleLength 666 ); 667} 668 669static 670int getWindow2Nr(int length, int shape) 671{ 672 int nr = 0; 673 674 if (shape == 2) { 675 /* Low Overlap, 3/4 zeroed */ 676 nr = (length * 3)>>2; 677 } 678 679 return nr; 680} 681 682void CBlock_FrequencyToTime(CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, 683 CAacDecoderChannelInfo *pAacDecoderChannelInfo, 684 INT_PCM outSamples[], 685 const SHORT frameLen, 686 const int stride, 687 const int frameOk, 688 FIXP_DBL *pWorkBuffer1 ) 689{ 690 int fr, fl, tl, nSamples, nSpec; 691 692 /* Determine left slope length (fl), right slope length (fr) and transform length (tl). 693 USAC: The slope length may mismatch with the previous frame in case of LPD / FD 694 transitions. The adjustment is handled by the imdct implementation. 695 */ 696 tl = frameLen; 697 nSpec = 1; 698 699 switch( pAacDecoderChannelInfo->icsInfo.WindowSequence ) { 700 default: 701 case OnlyLongSequence: 702 fl = frameLen; 703 fr = frameLen - getWindow2Nr(frameLen, GetWindowShape(&pAacDecoderChannelInfo->icsInfo)); 704 break; 705 case LongStopSequence: 706 fl = frameLen >> 3; 707 fr = frameLen; 708 break; 709 case LongStartSequence: /* or StopStartSequence */ 710 fl = frameLen; 711 fr = frameLen >> 3; 712 break; 713 case EightShortSequence: 714 fl = fr = frameLen >> 3; 715 tl >>= 3; 716 nSpec = 8; 717 break; 718 } 719 720 { 721 int i; 722 723 { 724 FIXP_DBL *tmp = pAacDecoderChannelInfo->pComData->workBufferCore1->mdctOutTemp; 725 726 nSamples = imdct_block( 727 &pAacDecoderStaticChannelInfo->IMdct, 728 tmp, 729 SPEC_LONG(pAacDecoderChannelInfo->pSpectralCoefficient), 730 pAacDecoderChannelInfo->specScale, 731 nSpec, 732 frameLen, 733 tl, 734 FDKgetWindowSlope(fl, GetWindowShape(&pAacDecoderChannelInfo->icsInfo)), 735 fl, 736 FDKgetWindowSlope(fr, GetWindowShape(&pAacDecoderChannelInfo->icsInfo)), 737 fr, 738 (FIXP_DBL)0 ); 739 740 for (i=0; i<frameLen; i++) { 741 outSamples[i*stride] = IMDCT_SCALE(tmp[i]); 742 } 743 } 744 } 745 746 FDK_ASSERT(nSamples == frameLen); 747 748} 749 750#include "ldfiltbank.h" 751void CBlock_FrequencyToTimeLowDelay( CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, 752 CAacDecoderChannelInfo *pAacDecoderChannelInfo, 753 INT_PCM outSamples[], 754 const short frameLen, 755 const char stride ) 756{ 757 InvMdctTransformLowDelay_fdk ( 758 SPEC_LONG(pAacDecoderChannelInfo->pSpectralCoefficient), 759 pAacDecoderChannelInfo->specScale[0], 760 outSamples, 761 pAacDecoderStaticChannelInfo->pOverlapBuffer, 762 stride, 763 frameLen 764 ); 765} 766