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-4 AAC Decoder ************************** 85 86 Author(s): Josef Hoepfl 87 Description: 88 89 ******************************************************************************/ 90 91 92 /*! 93 \page default General Overview of the AAC Decoder Implementation 94 95 The main entry point to decode a AAC frame is CAacDecoder_DecodeFrame(). It handles the different 96 transport multiplexes and bitstream formats supported by this implementation. It extracts the 97 AAC_raw_data_blocks from these bitstreams to further process then in the actual decoding stages. 98 99 Note: Click on a function of file in the above image to see details about the function. Also note, that 100 this is just an overview of the most important functions and not a complete call graph. 101 102 <h2>1 Bitstream deformatter</h2> 103 The basic bit stream parser function CChannelElement_Read() is called. It uses other subcalls in order 104 to parse and unpack the bitstreams. Note, that this includes huffmann decoding of the coded spectral data. 105 This operation can be computational significant specifically at higher bitrates. Optimization is likely in 106 CBlock_ReadSpectralData(). 107 108 The bitstream deformatter also includes many bitfield operations. Profiling on the target will determine 109 required optimizations. 110 111 <h2>2 Actual decoding to retain the time domain output</h2> 112 The basic bitstream deformatter function CChannelElement_Decode() for CPE elements and SCE elements are called. 113 Except for the stereo processing (2.1) which is only used for CPE elements, the function calls for CPE or SCE 114 are similar, except that CPE always processes to independent channels while SCE only processes one channel. 115 116 Often there is the distinction between long blocks and short blocks. However, computational expensive functions 117 that ususally require optimization are being shared by these two groups, 118 119 <h3>2.1 Stereo processing for CPE elements</h3> 120 CChannelPairElement_Decode() first calles the joint stereo tools in stereo.cpp when required. 121 122 <h3>2.2 Scaling of spectral data</h3> 123 CBlock_ScaleSpectralData(). 124 125 <h3>2.3 Apply additional coding tools</h3> 126 ApplyTools() calles the PNS tools in case of MPEG-4 bitstreams, and TNS filtering CTns_Apply() for MPEG-2 and MPEG-4 bitstreams. 127 The function TnsFilterIIR() which is called by CTns_Apply() (2.3.1) might require some optimization. 128 129 <h2>3 Frequency-To-Time conversion</h3> 130 The filterbank is called using CBlock_FrequencyToTime() using the MDCT module from the FDK Tools 131 132 */ 133 134 135 136 #include "aacdecoder.h" 137 138 #include "aac_rom.h" 139 #include "aac_ram.h" 140 #include "channel.h" 141 #include "FDK_audio.h" 142 143 #include "FDK_tools_rom.h" 144 145 #include "aacdec_pns.h" 146 147 #include "sbrdecoder.h" 148 149 150 151 152 #include "aacdec_hcr.h" 153 #include "rvlc.h" 154 155 156 #include "tpdec_lib.h" 157 158 #include "conceal.h" 159 160 161 162 #define CAN_DO_PS(aot) \ 163 ((aot) == AOT_AAC_LC \ 164 || (aot) == AOT_SBR \ 165 || (aot) == AOT_PS \ 166 || (aot) == AOT_ER_BSAC \ 167 || (aot) == AOT_DRM_AAC) 168 169 #define IS_USAC(aot) \ 170 ((aot) == AOT_USAC \ 171 || (aot) == AOT_RSVD50) 172 173 #define IS_LOWDELAY(aot) \ 174 ((aot) == AOT_ER_AAC_LD \ 175 || (aot) == AOT_ER_AAC_ELD) 176 177 void CAacDecoder_SyncQmfMode(HANDLE_AACDECODER self) 178 { 179 180 /* Assign user requested mode */ 181 self->qmfModeCurr = self->qmfModeUser; 182 183 if ( self->qmfModeCurr == NOT_DEFINED ) 184 { 185 if ( (IS_LOWDELAY(self->streamInfo.aot) && (self->flags & AC_MPS_PRESENT)) 186 || ( (self->ascChannels == 1) 187 && ( (CAN_DO_PS(self->streamInfo.aot) && !(self->flags & AC_MPS_PRESENT)) 188 || ( IS_USAC(self->streamInfo.aot) && (self->flags & AC_MPS_PRESENT)) ) ) ) 189 { 190 self->qmfModeCurr = MODE_HQ; 191 } else { 192 self->qmfModeCurr = MODE_LP; 193 } 194 } 195 196 197 /* Set SBR to current QMF mode. Error does not matter. */ 198 sbrDecoder_SetParam(self->hSbrDecoder, SBR_QMF_MODE, (self->qmfModeCurr == MODE_LP)); 199 self->psPossible = ((CAN_DO_PS(self->streamInfo.aot) && self->aacChannels == 1 && ! (self->flags & AC_MPS_PRESENT))) && self->qmfModeCurr == MODE_HQ ; 200 FDK_ASSERT( ! ( (self->flags & AC_MPS_PRESENT) && self->psPossible ) ); 201 } 202 203 void CAacDecoder_SignalInterruption(HANDLE_AACDECODER self) 204 { 205 } 206 207 /*! 208 \brief Reset ancillary data struct. Call before parsing a new frame. 209 210 \ancData Pointer to ancillary data structure 211 212 \return Error code 213 */ 214 static AAC_DECODER_ERROR CAacDecoder_AncDataReset(CAncData *ancData) 215 { 216 int i; 217 for (i=0; i<8; i++) 218 { 219 ancData->offset[i] = 0; 220 } 221 ancData->nrElements = 0; 222 223 return AAC_DEC_OK; 224 } 225 226 /*! 227 \brief Initialize ancillary buffer 228 229 \ancData Pointer to ancillary data structure 230 \buffer Pointer to (external) anc data buffer 231 \size Size of the buffer pointed on by buffer in bytes 232 233 \return Error code 234 */ 235 AAC_DECODER_ERROR CAacDecoder_AncDataInit(CAncData *ancData, unsigned char *buffer, int size) 236 { 237 if (size >= 0) { 238 ancData->buffer = buffer; 239 ancData->bufferSize = size; 240 241 CAacDecoder_AncDataReset(ancData); 242 243 return AAC_DEC_OK; 244 } 245 246 return AAC_DEC_ANC_DATA_ERROR; 247 } 248 249 /*! 250 \brief Get one ancillary data element 251 252 \ancData Pointer to ancillary data structure 253 \index Index of the anc data element to get 254 \ptr Pointer to a buffer receiving a pointer to the requested anc data element 255 \size Pointer to a buffer receiving the length of the requested anc data element in bytes 256 257 \return Error code 258 */ 259 AAC_DECODER_ERROR CAacDecoder_AncDataGet(CAncData *ancData, int index, unsigned char **ptr, int *size) 260 { 261 AAC_DECODER_ERROR error = AAC_DEC_OK; 262 263 *ptr = NULL; 264 *size = 0; 265 266 if (index >= 0 && index < 8 && index < ancData->nrElements) 267 { 268 *ptr = &ancData->buffer[ancData->offset[index]]; 269 *size = ancData->offset[index+1] - ancData->offset[index]; 270 } 271 272 return error; 273 } 274 275 276 /*! 277 \brief Parse ancillary data 278 279 \ancData Pointer to ancillary data structure 280 \hBs Handle to FDK bitstream 281 \ancBytes Length of ancillary data to read from the bitstream 282 283 \return Error code 284 */ 285 static 286 AAC_DECODER_ERROR CAacDecoder_AncDataParse ( 287 CAncData *ancData, 288 HANDLE_FDK_BITSTREAM hBs, 289 const int ancBytes ) 290 { 291 AAC_DECODER_ERROR error = AAC_DEC_OK; 292 int readBytes = 0; 293 294 if (ancData->buffer != NULL) 295 { 296 if (ancBytes > 0) { 297 /* write ancillary data to external buffer */ 298 int offset = ancData->offset[ancData->nrElements]; 299 300 if ((offset + ancBytes) > ancData->bufferSize) 301 { 302 error = AAC_DEC_TOO_SMALL_ANC_BUFFER; 303 } 304 else if (ancData->nrElements >= 8-1) 305 { 306 error = AAC_DEC_TOO_MANY_ANC_ELEMENTS; 307 } 308 else 309 { 310 int i; 311 312 for (i = 0; i < ancBytes; i++) { 313 ancData->buffer[i+offset] = FDKreadBits(hBs, 8); 314 readBytes++; 315 } 316 317 ancData->nrElements++; 318 ancData->offset[ancData->nrElements] = ancBytes + ancData->offset[ancData->nrElements-1]; 319 } 320 } 321 } 322 323 readBytes = ancBytes - readBytes; 324 325 if (readBytes > 0) { 326 /* skip data */ 327 FDKpushFor(hBs, readBytes<<3); 328 } 329 330 return error; 331 } 332 333 /*! 334 \brief Read Stream Data Element 335 336 \bs Bitstream Handle 337 338 \return Error code 339 */ 340 static AAC_DECODER_ERROR CDataStreamElement_Read ( 341 HANDLE_FDK_BITSTREAM bs, 342 CAncData *ancData, 343 HANDLE_AAC_DRC hDrcInfo, 344 HANDLE_TRANSPORTDEC pTp, 345 UCHAR *elementInstanceTag, 346 UINT alignmentAnchor ) 347 { 348 AAC_DECODER_ERROR error = AAC_DEC_OK; 349 UINT dataStart; 350 int dataByteAlignFlag, count; 351 352 int crcReg = transportDec_CrcStartReg(pTp, 0); 353 354 /* Element Instance Tag */ 355 *elementInstanceTag = FDKreadBits(bs,4); 356 /* Data Byte Align Flag */ 357 dataByteAlignFlag = FDKreadBits(bs,1); 358 359 count = FDKreadBits(bs,8); 360 361 if (count == 255) { 362 count += FDKreadBits(bs,8); /* EscCount */ 363 } 364 365 if (dataByteAlignFlag) { 366 FDKbyteAlign(bs, alignmentAnchor); 367 } 368 369 dataStart = FDKgetValidBits(bs); 370 371 error = CAacDecoder_AncDataParse(ancData, bs, count); 372 transportDec_CrcEndReg(pTp, crcReg); 373 374 { 375 INT readBits, dataBits = count<<3; 376 377 /* Move to the beginning of the data junk */ 378 FDKpushBack(bs, dataStart-FDKgetValidBits(bs)); 379 380 /* Read Anc data if available */ 381 readBits = aacDecoder_drcMarkPayload( hDrcInfo, bs, DVB_DRC_ANC_DATA ); 382 383 if (readBits != dataBits) { 384 /* Move to the end again. */ 385 FDKpushBiDirectional(bs, FDKgetValidBits(bs)-dataStart+dataBits); 386 } 387 } 388 389 return error; 390 } 391 392 #ifdef TP_PCE_ENABLE 393 /*! 394 \brief Read Program Config Element 395 396 \bs Bitstream Handle 397 \count Pointer to program config element. 398 399 \return Error code 400 */ 401 static AAC_DECODER_ERROR CProgramConfigElement_Read ( 402 HANDLE_FDK_BITSTREAM bs, 403 HANDLE_TRANSPORTDEC pTp, 404 CProgramConfig *pce, 405 UINT channelConfig, 406 UINT alignAnchor ) 407 { 408 AAC_DECODER_ERROR error = AAC_DEC_OK; 409 int crcReg; 410 411 /* read PCE to temporal buffer first */ 412 C_ALLOC_SCRATCH_START(tmpPce, CProgramConfig, 1); 413 414 CProgramConfig_Init(tmpPce); 415 CProgramConfig_Reset(tmpPce); 416 417 crcReg = transportDec_CrcStartReg(pTp, 0); 418 419 CProgramConfig_Read(tmpPce, bs, alignAnchor); 420 421 transportDec_CrcEndReg(pTp, crcReg); 422 423 if ( CProgramConfig_IsValid(tmpPce) 424 && ( (channelConfig == 6 && (tmpPce->NumChannels == 6)) 425 || (channelConfig == 5 && (tmpPce->NumChannels == 5)) 426 || (channelConfig == 0 && (tmpPce->NumChannels == pce->NumChannels)) ) 427 && (tmpPce->NumFrontChannelElements == 2) 428 && (tmpPce->NumSideChannelElements == 0) 429 && (tmpPce->NumBackChannelElements == 1) 430 && (tmpPce->Profile == 1) ) 431 { /* Copy the complete PCE including metadata. */ 432 FDKmemcpy(pce, tmpPce, sizeof(CProgramConfig)); 433 } 434 435 C_ALLOC_SCRATCH_END(tmpPce, CProgramConfig, 1); 436 437 return error; 438 } 439 #endif 440 441 /*! 442 \brief Parse Extension Payload 443 444 \self Handle of AAC decoder 445 \count Pointer to bit counter. 446 \previous_element ID of previous element (required by some extension payloads) 447 448 \return Error code 449 */ 450 static 451 AAC_DECODER_ERROR CAacDecoder_ExtPayloadParse (HANDLE_AACDECODER self, 452 HANDLE_FDK_BITSTREAM hBs, 453 int *count, 454 MP4_ELEMENT_ID previous_element, 455 int elIndex, 456 int fIsFillElement) 457 { 458 AAC_DECODER_ERROR error = AAC_DEC_OK; 459 EXT_PAYLOAD_TYPE extension_type; 460 int bytes = (*count) >> 3; 461 int crcFlag = 0; 462 463 if (*count < 4) { 464 return AAC_DEC_PARSE_ERROR; 465 } else if ((INT)FDKgetValidBits(hBs) < *count) { 466 return AAC_DEC_DECODE_FRAME_ERROR; 467 } 468 469 extension_type = (EXT_PAYLOAD_TYPE) FDKreadBits(hBs, 4); /* bs_extension_type */ 470 *count -= 4; 471 472 switch (extension_type) 473 { 474 case EXT_DYNAMIC_RANGE: 475 { 476 INT readBits = aacDecoder_drcMarkPayload( self->hDrcInfo, hBs, MPEG_DRC_EXT_DATA ); 477 478 if (readBits > *count) 479 { /* Read too much. Something went wrong! */ 480 error = AAC_DEC_PARSE_ERROR; 481 } 482 *count -= readBits; 483 } 484 break; 485 486 487 case EXT_SBR_DATA_CRC: 488 crcFlag = 1; 489 case EXT_SBR_DATA: 490 if (IS_CHANNEL_ELEMENT(previous_element)) { 491 SBR_ERROR sbrError; 492 493 CAacDecoder_SyncQmfMode(self); 494 495 sbrError = sbrDecoder_InitElement( 496 self->hSbrDecoder, 497 self->streamInfo.aacSampleRate, 498 self->streamInfo.extSamplingRate, 499 self->streamInfo.aacSamplesPerFrame, 500 self->streamInfo.aot, 501 previous_element, 502 elIndex 503 ); 504 505 if (sbrError == SBRDEC_OK) { 506 sbrError = sbrDecoder_Parse ( 507 self->hSbrDecoder, 508 hBs, 509 count, 510 *count, 511 crcFlag, 512 previous_element, 513 elIndex, 514 self->flags & AC_INDEP ); 515 /* Enable SBR for implicit SBR signalling. */ 516 if (sbrError == SBRDEC_OK) { 517 self->sbrEnabled = 1; 518 } 519 } else { 520 /* Do not try to apply SBR because initializing the element failed. */ 521 self->sbrEnabled = 0; 522 } 523 /* Citation from ISO/IEC 14496-3 chapter 4.5.2.1.5.2 524 Fill elements containing an extension_payload() with an extension_type of EXT_SBR_DATA 525 or EXT_SBR_DATA_CRC shall not contain any other extension_payload of any other extension_type. 526 */ 527 if (fIsFillElement) { 528 FDKpushBiDirectional(hBs, *count); 529 *count = 0; 530 } else { 531 /* If this is not a fill element with a known length, we are screwed an no further parsing makes sense. */ 532 if (sbrError != SBRDEC_OK) { 533 self->frameOK = 0; 534 } 535 } 536 } else { 537 error = AAC_DEC_PARSE_ERROR; 538 } 539 break; 540 541 case EXT_FILL_DATA: 542 { 543 int temp; 544 545 temp = FDKreadBits(hBs,4); 546 bytes--; 547 if (temp != 0) { 548 error = AAC_DEC_PARSE_ERROR; 549 break; 550 } 551 while (bytes > 0) { 552 temp = FDKreadBits(hBs,8); 553 bytes--; 554 if (temp != 0xa5) { 555 error = AAC_DEC_PARSE_ERROR; 556 break; 557 } 558 } 559 *count = bytes<<3; 560 } 561 break; 562 563 case EXT_DATA_ELEMENT: 564 { 565 int dataElementVersion; 566 567 dataElementVersion = FDKreadBits(hBs,4); 568 *count -= 4; 569 if (dataElementVersion == 0) /* ANC_DATA */ 570 { 571 int temp, dataElementLength = 0; 572 do { 573 temp = FDKreadBits(hBs,8); 574 *count -= 8; 575 dataElementLength += temp; 576 } while (temp == 255 ); 577 578 CAacDecoder_AncDataParse(&self->ancData, hBs, dataElementLength); 579 *count -= (dataElementLength<<3); 580 } else { 581 /* align = 0 */ 582 error = AAC_DEC_PARSE_ERROR; 583 goto bail; 584 } 585 } 586 break; 587 588 case EXT_DATA_LENGTH: 589 if ( !fIsFillElement /* Makes no sens to have an additional length in a fill ... */ 590 && (self->flags & AC_ER) ) /* ... element because this extension payload type was ... */ 591 { /* ... created to circumvent the missing length in ER-Syntax. */ 592 int bitCnt, len = FDKreadBits(hBs, 4); 593 *count -= 4; 594 595 if (len == 15) { 596 int add_len = FDKreadBits(hBs, 8); 597 *count -= 8; 598 len += add_len; 599 600 if (add_len == 255) { 601 len += FDKreadBits(hBs, 16); 602 *count -= 16; 603 } 604 } 605 len <<= 3; 606 bitCnt = len; 607 608 if ( (EXT_PAYLOAD_TYPE)FDKreadBits(hBs, 4) == EXT_DATA_LENGTH ) { 609 /* Check NOTE 2: The extension_payload() included here must 610 not have extension_type == EXT_DATA_LENGTH. */ 611 error = AAC_DEC_PARSE_ERROR; 612 goto bail; 613 } 614 else { 615 /* rewind and call myself again. */ 616 FDKpushBack(hBs, 4); 617 618 error = 619 CAacDecoder_ExtPayloadParse ( 620 self, 621 hBs, 622 &bitCnt, 623 previous_element, 624 elIndex, 625 1 ); /* Treat same as fill element */ 626 627 *count -= len - bitCnt; 628 } 629 /* Note: the fall through in case the if statement above is not taken is intentional. */ 630 break; 631 } 632 633 case EXT_FIL: 634 635 default: 636 /* align = 4 */ 637 FDKpushFor(hBs, *count); 638 *count = 0; 639 break; 640 } 641 642 bail: 643 if ( (error != AAC_DEC_OK) 644 && fIsFillElement ) 645 { /* Skip the remaining extension bytes */ 646 FDKpushBiDirectional(hBs, *count); 647 *count = 0; 648 /* Patch error code because decoding can go on. */ 649 error = AAC_DEC_OK; 650 /* Be sure that parsing errors have been stored. */ 651 } 652 return error; 653 } 654 655 /* Stream Configuration and Information. 656 657 This class holds configuration and information data for a stream to be decoded. It 658 provides the calling application as well as the decoder with substantial information, 659 e.g. profile, sampling rate, number of channels found in the bitstream etc. 660 */ 661 static 662 void CStreamInfoInit(CStreamInfo *pStreamInfo) 663 { 664 pStreamInfo->aacSampleRate = 0; 665 pStreamInfo->profile = -1; 666 pStreamInfo->aot = AOT_NONE; 667 668 pStreamInfo->channelConfig = -1; 669 pStreamInfo->bitRate = 0; 670 pStreamInfo->aacSamplesPerFrame = 0; 671 672 pStreamInfo->extAot = AOT_NONE; 673 pStreamInfo->extSamplingRate = 0; 674 675 pStreamInfo->flags = 0; 676 677 pStreamInfo->epConfig = -1; /* default is no ER */ 678 679 pStreamInfo->numChannels = 0; 680 pStreamInfo->sampleRate = 0; 681 pStreamInfo->frameSize = 0; 682 } 683 684 /*! 685 \brief Initialization of AacDecoderChannelInfo 686 687 The function initializes the pointers to AacDecoderChannelInfo for each channel, 688 set the start values for window shape and window sequence of overlap&add to zero, 689 set the overlap buffer to zero and initializes the pointers to the window coefficients. 690 \param bsFormat is the format of the AAC bitstream 691 692 \return AACDECODER instance 693 */ 694 LINKSPEC_CPP HANDLE_AACDECODER CAacDecoder_Open(TRANSPORT_TYPE bsFormat) /*!< bitstream format (adif,adts,loas,...). */ 695 { 696 HANDLE_AACDECODER self; 697 698 self = GetAacDecoder(); 699 if (self == NULL) { 700 goto bail; 701 } 702 703 /* Assign channel mapping info arrays (doing so removes dependency of settings header in API header). */ 704 self->streamInfo.pChannelIndices = self->channelIndices; 705 self->streamInfo.pChannelType = self->channelType; 706 707 /* set default output mode */ 708 self->outputInterleaved = 1; /* interleaved */ 709 710 /* initialize anc data */ 711 CAacDecoder_AncDataInit(&self->ancData, NULL, 0); 712 713 /* initialize stream info */ 714 CStreamInfoInit(&self->streamInfo); 715 716 /* initialize error concealment common data */ 717 CConcealment_InitCommonData(&self->concealCommonData); 718 719 self->hDrcInfo = GetDrcInfo(); 720 if (self->hDrcInfo == NULL) { 721 goto bail; 722 } 723 /* Init common DRC structure */ 724 aacDecoder_drcInit( self->hDrcInfo ); 725 /* Set default frame delay */ 726 aacDecoder_drcSetParam ( 727 self->hDrcInfo, 728 DRC_BS_DELAY, 729 CConcealment_GetDelay(&self->concealCommonData) 730 ); 731 732 733 self->aacCommonData.workBufferCore1 = GetWorkBufferCore1(); 734 self->aacCommonData.workBufferCore2 = GetWorkBufferCore2(); 735 if (self->aacCommonData.workBufferCore1 == NULL 736 ||self->aacCommonData.workBufferCore2 == NULL ) 737 goto bail; 738 739 return self; 740 741 bail: 742 CAacDecoder_Close( self ); 743 744 return NULL; 745 } 746 747 /* Destroy aac decoder */ 748 LINKSPEC_CPP void CAacDecoder_Close(HANDLE_AACDECODER self) 749 { 750 int ch; 751 752 if (self == NULL) 753 return; 754 755 for (ch=0; ch<(6); ch++) { 756 if (self->pAacDecoderStaticChannelInfo[ch] != NULL) { 757 FreeOverlapBuffer (&self->pAacDecoderStaticChannelInfo[ch]->pOverlapBuffer); 758 FreeAacDecoderStaticChannelInfo (&self->pAacDecoderStaticChannelInfo[ch]); 759 } 760 if (self->pAacDecoderChannelInfo[ch] != NULL) { 761 FreeAacDecoderChannelInfo (&self->pAacDecoderChannelInfo[ch]); 762 } 763 } 764 765 self->aacChannels = 0; 766 767 if (self->hDrcInfo) { 768 FreeDrcInfo(&self->hDrcInfo); 769 } 770 771 FreeWorkBufferCore1 (&self->aacCommonData.workBufferCore1); 772 FreeWorkBufferCore2 (&self->aacCommonData.workBufferCore2); 773 774 FreeAacDecoder ( &self); 775 } 776 777 778 /*! 779 \brief Initialization of decoder instance 780 781 The function initializes the decoder. 782 783 \return error status: 0 for success, <>0 for unsupported configurations 784 */ 785 LINKSPEC_CPP AAC_DECODER_ERROR CAacDecoder_Init(HANDLE_AACDECODER self, const CSAudioSpecificConfig *asc) 786 { 787 AAC_DECODER_ERROR err = AAC_DEC_OK; 788 INT ascChannels, ch, ascChanged = 0; 789 790 if (!self) 791 return AAC_DEC_INVALID_HANDLE; 792 793 // set profile and check for supported aot 794 // leave profile on default (=-1) for all other supported MPEG-4 aot's except aot=2 (=AAC-LC) 795 switch (asc->m_aot) { 796 case AOT_AAC_LC: 797 self->streamInfo.profile = 1; 798 break; 799 800 case AOT_SBR: 801 case AOT_PS: 802 case AOT_ER_AAC_LD: 803 case AOT_ER_AAC_ELD: 804 break; 805 806 default: 807 return AAC_DEC_UNSUPPORTED_AOT; 808 } 809 810 CProgramConfig_Init(&self->pce); 811 812 /* set channels */ 813 switch (asc->m_channelConfiguration) { 814 case 0: 815 #ifdef TP_PCE_ENABLE 816 /* get channels from program config (ASC) */ 817 if (CProgramConfig_IsValid(&asc->m_progrConfigElement)) { 818 ascChannels = asc->m_progrConfigElement.NumChannels; 819 if (ascChannels > 0) { 820 int el; 821 /* valid number of channels -> copy program config element (PCE) from ASC */ 822 FDKmemcpy(&self->pce, &asc->m_progrConfigElement, sizeof(CProgramConfig)); 823 /* Built element table */ 824 el = CProgramConfig_GetElementTable(&asc->m_progrConfigElement, self->elements, 7); 825 for (; el<7; el++) { 826 self->elements[el] = ID_NONE; 827 } 828 } else { 829 return AAC_DEC_UNSUPPORTED_CHANNELCONFIG; 830 } 831 } else { 832 if (transportDec_GetFormat(self->hInput) == TT_MP4_ADTS) { 833 /* set default max_channels for memory allocation because in implicit channel mapping mode 834 we don't know the actual number of channels until we processed at least one raw_data_block(). */ 835 ascChannels = (6); 836 } else { 837 return AAC_DEC_UNSUPPORTED_CHANNELCONFIG; 838 } 839 } 840 #else /* TP_PCE_ENABLE */ 841 return AAC_DEC_UNSUPPORTED_CHANNELCONFIG; 842 #endif /* TP_PCE_ENABLE */ 843 break; 844 case 1: case 2: case 3: case 4: case 5: case 6: 845 ascChannels = asc->m_channelConfiguration; 846 break; 847 case 7: 848 ascChannels = 8; 849 break; 850 default: 851 return AAC_DEC_UNSUPPORTED_CHANNELCONFIG; 852 } 853 854 /* Initialize constant mappings for channel config 1-7 */ 855 if (asc->m_channelConfiguration > 0) { 856 int el; 857 FDKmemcpy(self->elements, elementsTab[asc->m_channelConfiguration-1], sizeof(MP4_ELEMENT_ID)*FDKmin(7,7)); 858 for (el=7; el<7; el++) { 859 self->elements[el] = ID_NONE; 860 } 861 for (ch=0; ch<ascChannels; ch++) { 862 self->chMapping[ch] = ch; 863 } 864 for (; ch<(6); ch++) { 865 self->chMapping[ch] = 255; 866 } 867 } 868 #ifdef TP_PCE_ENABLE 869 else { 870 if (CProgramConfig_IsValid(&asc->m_progrConfigElement)) { 871 /* Set matrix mixdown infos if available from PCE. */ 872 pcmDmx_SetMatrixMixdownFromPce ( self->hPcmUtils, 873 asc->m_progrConfigElement.MatrixMixdownIndexPresent, 874 asc->m_progrConfigElement.MatrixMixdownIndex, 875 asc->m_progrConfigElement.PseudoSurroundEnable ); 876 } 877 } 878 #endif 879 880 self->streamInfo.channelConfig = asc->m_channelConfiguration; 881 882 if (ascChannels > (6)) { 883 return AAC_DEC_UNSUPPORTED_CHANNELCONFIG; 884 } 885 if (self->streamInfo.aot != asc->m_aot) { 886 self->streamInfo.aot = asc->m_aot; 887 ascChanged = 1; 888 } 889 890 if (self->streamInfo.aacSamplesPerFrame != (INT)asc->m_samplesPerFrame) { 891 self->streamInfo.aacSamplesPerFrame = asc->m_samplesPerFrame; 892 ascChanged = 1; 893 } 894 895 self->streamInfo.bitRate = 0; 896 897 /* Set syntax flags */ 898 self->flags = 0; 899 900 self->streamInfo.extAot = asc->m_extensionAudioObjectType; 901 self->streamInfo.extSamplingRate = asc->m_extensionSamplingFrequency; 902 self->flags |= (asc->m_sbrPresentFlag) ? AC_SBR_PRESENT : 0; 903 self->flags |= (asc->m_psPresentFlag) ? AC_PS_PRESENT : 0; 904 self->sbrEnabled = 0; 905 906 /* --------- vcb11 ------------ */ 907 self->flags |= (asc->m_vcb11Flag) ? AC_ER_VCB11 : 0; 908 909 /* ---------- rvlc ------------ */ 910 self->flags |= (asc->m_rvlcFlag) ? AC_ER_RVLC : 0; 911 912 /* ----------- hcr ------------ */ 913 self->flags |= (asc->m_hcrFlag) ? AC_ER_HCR : 0; 914 915 if (asc->m_aot == AOT_ER_AAC_ELD) { 916 self->flags |= AC_ELD; 917 self->flags |= (asc->m_sc.m_eldSpecificConfig.m_sbrCrcFlag) ? AC_SBRCRC : 0; 918 self->flags |= (asc->m_sc.m_eldSpecificConfig.m_useLdQmfTimeAlign) ? AC_LD_MPS : 0; 919 } 920 self->flags |= (asc->m_aot == AOT_ER_AAC_LD) ? AC_LD : 0; 921 self->flags |= (asc->m_epConfig >= 0) ? AC_ER : 0; 922 923 924 if (asc->m_sbrPresentFlag) { 925 self->sbrEnabled = 1; 926 self->sbrEnabledPrev = 1; 927 } 928 if (asc->m_psPresentFlag) { 929 self->flags |= AC_PS_PRESENT; 930 } 931 932 if ( (asc->m_epConfig >= 0) 933 && (asc->m_channelConfiguration <= 0) ) { 934 /* we have to know the number of channels otherwise no decoding is possible */ 935 return AAC_DEC_UNSUPPORTED_ER_FORMAT; 936 } 937 938 self->streamInfo.epConfig = asc->m_epConfig; 939 /* self->hInput->asc.m_epConfig = asc->m_epConfig; */ 940 941 if (asc->m_epConfig > 1) 942 return AAC_DEC_UNSUPPORTED_ER_FORMAT; 943 944 /* Check if samplerate changed. */ 945 if (self->streamInfo.aacSampleRate != (INT)asc->m_samplingFrequency) { 946 AAC_DECODER_ERROR error; 947 948 ascChanged = 1; 949 950 /* Update samplerate info. */ 951 error = getSamplingRateInfo(&self->samplingRateInfo, asc->m_samplesPerFrame, asc->m_samplingFrequencyIndex, asc->m_samplingFrequency); 952 if (error != AAC_DEC_OK) { 953 return error; 954 } 955 self->streamInfo.aacSampleRate = self->samplingRateInfo.samplingRate; 956 } 957 958 /* Check if amount of channels has changed. */ 959 if (self->ascChannels != ascChannels) 960 { 961 ascChanged = 1; 962 963 /* Allocate all memory structures for each channel */ 964 { 965 for (ch = 0; ch < ascChannels; ch++) { 966 CAacDecoderDynamicData *aacDecoderDynamicData = &self->aacCommonData.workBufferCore1->pAacDecoderDynamicData[ch%2]; 967 968 /* initialize pointer to CAacDecoderChannelInfo */ 969 if (self->pAacDecoderChannelInfo[ch] == NULL) { 970 self->pAacDecoderChannelInfo[ch] = GetAacDecoderChannelInfo(ch); 971 /* This is temporary until the DynamicData is split into two or more regions! 972 The memory could be reused after completed core decoding. */ 973 if (self->pAacDecoderChannelInfo[ch] == NULL) { 974 goto bail; 975 } 976 /* Hook shared work memory into channel data structure */ 977 self->pAacDecoderChannelInfo[ch]->pDynData = aacDecoderDynamicData; 978 self->pAacDecoderChannelInfo[ch]->pComData = &self->aacCommonData; 979 } 980 981 /* Allocate persistent channel memory */ 982 if (self->pAacDecoderStaticChannelInfo[ch] == NULL) { 983 self->pAacDecoderStaticChannelInfo[ch] = GetAacDecoderStaticChannelInfo(ch); 984 if (self->pAacDecoderStaticChannelInfo[ch] == NULL) { 985 goto bail; 986 } 987 self->pAacDecoderStaticChannelInfo[ch]->pOverlapBuffer = GetOverlapBuffer(ch); /* This area size depends on the AOT */ 988 if (self->pAacDecoderStaticChannelInfo[ch]->pOverlapBuffer == NULL) { 989 goto bail; 990 } 991 self->pAacDecoderChannelInfo[ch]->pSpectralCoefficient = (SPECTRAL_PTR) &self->aacCommonData.workBufferCore2[ch*1024]; 992 993 } 994 CPns_InitPns(&self->pAacDecoderChannelInfo[ch]->data.aac.PnsData, &self->aacCommonData.pnsInterChannelData, &self->aacCommonData.pnsCurrentSeed, self->aacCommonData.pnsRandomSeed); 995 } 996 997 998 HcrInitRom(&self->aacCommonData.overlay.aac.erHcrInfo); 999 setHcrType(&self->aacCommonData.overlay.aac.erHcrInfo, ID_SCE); 1000 1001 /* Make allocated channel count persistent in decoder context. */ 1002 self->aacChannels = ascChannels; 1003 } 1004 1005 /* Make amount of signalled channels persistent in decoder context. */ 1006 self->ascChannels = ascChannels; 1007 } 1008 1009 /* Update structures */ 1010 if (ascChanged) { 1011 1012 /* Things to be done for each channel, which do not involved allocating memory. */ 1013 for (ch = 0; ch < ascChannels; ch++) { 1014 switch (self->streamInfo.aot) { 1015 case AOT_ER_AAC_ELD: 1016 case AOT_ER_AAC_LD: 1017 self->pAacDecoderChannelInfo[ch]->granuleLength = self->streamInfo.aacSamplesPerFrame; 1018 break; 1019 default: 1020 self->pAacDecoderChannelInfo[ch]->granuleLength = self->streamInfo.aacSamplesPerFrame / 8; 1021 break; 1022 } 1023 mdct_init( &self->pAacDecoderStaticChannelInfo[ch]->IMdct, 1024 self->pAacDecoderStaticChannelInfo[ch]->pOverlapBuffer, 1025 OverlapBufferSize ); 1026 1027 1028 /* Reset DRC control data for this channel */ 1029 aacDecoder_drcInitChannelData ( &self->pAacDecoderStaticChannelInfo[ch]->drcData ); 1030 1031 /* Reset concealment only if ASC changed. Otherwise it will be done with any config callback. 1032 E.g. every time the LATM SMC is present. */ 1033 CConcealment_InitChannelData(&self->pAacDecoderStaticChannelInfo[ch]->concealmentInfo, 1034 &self->concealCommonData, 1035 self->streamInfo.aacSamplesPerFrame ); 1036 } 1037 } 1038 1039 /* Update externally visible copy of flags */ 1040 self->streamInfo.flags = self->flags; 1041 1042 return err; 1043 1044 bail: 1045 aacDecoder_Close( self ); 1046 return AAC_DEC_OUT_OF_MEMORY; 1047 } 1048 1049 1050 LINKSPEC_CPP AAC_DECODER_ERROR CAacDecoder_DecodeFrame( 1051 HANDLE_AACDECODER self, 1052 const UINT flags, 1053 INT_PCM *pTimeData, 1054 const INT timeDataSize, 1055 const INT interleaved 1056 ) 1057 { 1058 AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK; 1059 1060 CProgramConfig *pce; 1061 HANDLE_FDK_BITSTREAM bs = transportDec_GetBitstream(self->hInput, 0); 1062 1063 MP4_ELEMENT_ID type = ID_NONE; /* Current element type */ 1064 INT aacChannels=0; /* Channel counter for channels found in the bitstream */ 1065 1066 INT auStartAnchor = (INT)FDKgetValidBits(bs); /* AU start bit buffer position for AU byte alignment */ 1067 1068 self->frameOK = 1; 1069 1070 /* Any supported base layer valid AU will require more than 16 bits. */ 1071 if ( (transportDec_GetAuBitsRemaining(self->hInput, 0) < 15) && (flags & (AACDEC_CONCEAL|AACDEC_FLUSH)) == 0) { 1072 self->frameOK = 0; 1073 ErrorStatus = AAC_DEC_DECODE_FRAME_ERROR; 1074 } 1075 1076 1077 /* Reset Program Config structure */ 1078 pce = &self->pce; 1079 CProgramConfig_Reset(pce); 1080 1081 CAacDecoder_AncDataReset(&self->ancData); 1082 1083 { 1084 int ch; 1085 1086 if (self->streamInfo.channelConfig == 0) { 1087 /* Init Channel/Element mapping table */ 1088 for (ch=0; ch<(6); ch++) { 1089 self->chMapping[ch] = 255; 1090 } 1091 if (!CProgramConfig_IsValid(pce)) { 1092 int el; 1093 for (el=0; el<7; el++) { 1094 self->elements[el] = ID_NONE; 1095 } 1096 } 1097 } 1098 } 1099 1100 /* Check sampling frequency */ 1101 switch ( self->streamInfo.aacSampleRate ) { 1102 case 16000: 1103 case 12000: 1104 case 11025: 1105 case 8000: 1106 case 7350: 1107 case 48000: 1108 case 44100: 1109 case 32000: 1110 case 24000: 1111 case 22050: 1112 break; 1113 default: 1114 if ( ! (self->flags & (AC_USAC|AC_RSVD50)) ) { 1115 return AAC_DEC_UNSUPPORTED_SAMPLINGRATE; 1116 } 1117 break; 1118 } 1119 1120 1121 if ( flags & AACDEC_CLRHIST ) 1122 { 1123 int ch; 1124 /* Clear history */ 1125 for (ch = 0; ch < self->aacChannels; ch++) { 1126 /* Reset concealment */ 1127 CConcealment_InitChannelData(&self->pAacDecoderStaticChannelInfo[ch]->concealmentInfo, 1128 &self->concealCommonData, 1129 self->streamInfo.aacSamplesPerFrame ); 1130 /* Clear concealment buffers to get rid of the complete history */ 1131 FDKmemclear(self->pAacDecoderStaticChannelInfo[ch]->concealmentInfo.spectralCoefficient, 1024 * sizeof(FIXP_CNCL)); 1132 FDKmemclear(self->pAacDecoderStaticChannelInfo[ch]->concealmentInfo.specScale, 8 * sizeof(SHORT)); 1133 /* Clear overlap-add buffers to avoid clicks. */ 1134 FDKmemclear(self->pAacDecoderStaticChannelInfo[ch]->IMdct.overlap.freq, OverlapBufferSize*sizeof(FIXP_DBL)); 1135 } 1136 } 1137 1138 1139 1140 #ifdef TP_PCE_ENABLE 1141 int pceRead = 0; /* Flag indicating a PCE in the current raw_data_block() */ 1142 #endif 1143 1144 1145 INT hdaacDecoded = 0; 1146 MP4_ELEMENT_ID previous_element = ID_END; /* Last element ID (required for extension payload mapping */ 1147 UCHAR previous_element_index = 0; /* Canonical index of last element */ 1148 int element_count = 0; /* Element counter for elements found in the bitstream */ 1149 int el_cnt[ID_LAST] = { 0 }; /* element counter ( robustness ) */ 1150 1151 while ( (type != ID_END) && (! (flags & (AACDEC_CONCEAL | AACDEC_FLUSH))) && self->frameOK ) 1152 { 1153 int el_channels; 1154 1155 if (! (self->flags & (AC_USAC|AC_RSVD50|AC_ELD|AC_SCALABLE|AC_ER))) 1156 type = (MP4_ELEMENT_ID) FDKreadBits(bs,3); 1157 else 1158 type = self->elements[element_count]; 1159 1160 setHcrType(&self->aacCommonData.overlay.aac.erHcrInfo, type); 1161 1162 1163 if ((INT)FDKgetValidBits(bs) < 0) 1164 self->frameOK = 0; 1165 1166 switch (type) 1167 { 1168 case ID_SCE: 1169 case ID_CPE: 1170 case ID_LFE: 1171 /* 1172 Consistency check 1173 */ 1174 1175 if (type == ID_CPE) { 1176 el_channels = 2; 1177 } else { 1178 el_channels = 1; 1179 } 1180 1181 if ( (el_cnt[type] >= (self->ascChannels>>(el_channels-1))) || (aacChannels > (self->ascChannels-el_channels)) ) { 1182 ErrorStatus = AAC_DEC_DECODE_FRAME_ERROR; 1183 self->frameOK = 0; 1184 break; 1185 } 1186 1187 if ( !(self->flags & (AC_USAC|AC_RSVD50)) ) { 1188 int ch; 1189 for (ch=0; ch < el_channels; ch+=1) { 1190 CPns_ResetData(&self->pAacDecoderChannelInfo[aacChannels+ch]->data.aac.PnsData, 1191 &self->pAacDecoderChannelInfo[aacChannels+ch]->pComData->pnsInterChannelData); 1192 } 1193 } 1194 1195 if(self->frameOK) { 1196 ErrorStatus = CChannelElement_Read( bs, 1197 &self->pAacDecoderChannelInfo[aacChannels], 1198 &self->pAacDecoderStaticChannelInfo[aacChannels], 1199 self->streamInfo.aot, 1200 &self->samplingRateInfo, 1201 self->flags, 1202 self->streamInfo.aacSamplesPerFrame, 1203 el_channels, 1204 self->streamInfo.epConfig, 1205 self->hInput 1206 ); 1207 if (ErrorStatus) { 1208 self->frameOK = 0; 1209 } 1210 } 1211 1212 1213 if ( self->frameOK) { 1214 /* Lookup the element and decode it only if it belongs to the current program */ 1215 if ( CProgramConfig_LookupElement( 1216 pce, 1217 self->streamInfo.channelConfig, 1218 self->pAacDecoderChannelInfo[aacChannels]->ElementInstanceTag, 1219 aacChannels, 1220 self->chMapping, 1221 self->channelType, 1222 self->channelIndices, 1223 &previous_element_index, 1224 self->elements, 1225 type) ) 1226 { 1227 if ( !hdaacDecoded ) { 1228 CChannelElement_Decode( 1229 &self->pAacDecoderChannelInfo[aacChannels], 1230 &self->pAacDecoderStaticChannelInfo[aacChannels], 1231 &self->samplingRateInfo, 1232 self->flags, 1233 el_channels 1234 ); 1235 } 1236 aacChannels += 1; 1237 if (type == ID_CPE) { 1238 aacChannels += 1; 1239 } 1240 } 1241 else { 1242 self->frameOK = 0; 1243 } 1244 /* Create SBR element for SBR for upsampling. */ 1245 if ( (type == ID_LFE) 1246 && ( (self->flags & AC_SBR_PRESENT) 1247 || (self->sbrEnabled == 1) ) ) 1248 { 1249 SBR_ERROR sbrError; 1250 1251 sbrError = sbrDecoder_InitElement( 1252 self->hSbrDecoder, 1253 self->streamInfo.aacSampleRate, 1254 self->streamInfo.extSamplingRate, 1255 self->streamInfo.aacSamplesPerFrame, 1256 self->streamInfo.aot, 1257 ID_LFE, 1258 previous_element_index 1259 ); 1260 if (sbrError != SBRDEC_OK) { 1261 /* Do not try to apply SBR because initializing the element failed. */ 1262 self->sbrEnabled = 0; 1263 } 1264 } 1265 } 1266 1267 el_cnt[type]++; 1268 break; 1269 1270 case ID_CCE: 1271 /* 1272 Consistency check 1273 */ 1274 if ( el_cnt[type] > self->ascChannels ) { 1275 ErrorStatus = AAC_DEC_DECODE_FRAME_ERROR; 1276 self->frameOK = 0; 1277 break; 1278 } 1279 1280 if (self->frameOK) 1281 { 1282 /* memory for spectral lines temporal on scratch */ 1283 C_ALLOC_SCRATCH_START(mdctSpec, FIXP_DBL, 1024); 1284 1285 /* create dummy channel for CCE parsing on stack */ 1286 CAacDecoderChannelInfo tmpAacDecoderChannelInfo, *pTmpAacDecoderChannelInfo; 1287 1288 FDKmemclear(mdctSpec, 1024*sizeof(FIXP_DBL)); 1289 1290 tmpAacDecoderChannelInfo.pDynData = self->aacCommonData.workBufferCore1->pAacDecoderDynamicData; 1291 tmpAacDecoderChannelInfo.pComData = &self->aacCommonData; 1292 tmpAacDecoderChannelInfo.pSpectralCoefficient = (SPECTRAL_PTR)mdctSpec; 1293 /* Assume AAC-LC */ 1294 tmpAacDecoderChannelInfo.granuleLength = self->streamInfo.aacSamplesPerFrame / 8; 1295 1296 /* Reset PNS data. */ 1297 CPns_ResetData(&tmpAacDecoderChannelInfo.data.aac.PnsData, &tmpAacDecoderChannelInfo.pComData->pnsInterChannelData); 1298 1299 pTmpAacDecoderChannelInfo = &tmpAacDecoderChannelInfo; 1300 /* do CCE parsing */ 1301 ErrorStatus = CChannelElement_Read( bs, 1302 &pTmpAacDecoderChannelInfo, 1303 NULL, 1304 self->streamInfo.aot, 1305 &self->samplingRateInfo, 1306 self->flags, 1307 self->streamInfo.aacSamplesPerFrame, 1308 1, 1309 self->streamInfo.epConfig, 1310 self->hInput 1311 ); 1312 1313 C_ALLOC_SCRATCH_END(mdctSpec, FIXP_DBL, 1024); 1314 1315 if (ErrorStatus) { 1316 self->frameOK = 0; 1317 } 1318 1319 if (self->frameOK) { 1320 /* Lookup the element and decode it only if it belongs to the current program */ 1321 if (CProgramConfig_LookupElement( 1322 pce, 1323 self->streamInfo.channelConfig, 1324 pTmpAacDecoderChannelInfo->ElementInstanceTag, 1325 0, 1326 self->chMapping, 1327 self->channelType, 1328 self->channelIndices, 1329 &previous_element_index, 1330 self->elements, 1331 type) ) 1332 { 1333 /* decoding of CCE not supported */ 1334 } 1335 else { 1336 self->frameOK = 0; 1337 } 1338 } 1339 } 1340 el_cnt[type]++; 1341 break; 1342 1343 case ID_DSE: 1344 { 1345 UCHAR element_instance_tag; 1346 1347 CDataStreamElement_Read( bs, 1348 &self->ancData, 1349 self->hDrcInfo, 1350 self->hInput, 1351 &element_instance_tag, 1352 auStartAnchor ); 1353 1354 if (!CProgramConfig_LookupElement( 1355 pce, 1356 self->streamInfo.channelConfig, 1357 element_instance_tag, 1358 0, 1359 self->chMapping, 1360 self->channelType, 1361 self->channelIndices, 1362 &previous_element_index, 1363 self->elements, 1364 type) ) 1365 { 1366 /* most likely an error in bitstream occured */ 1367 //self->frameOK = 0; 1368 } 1369 } 1370 1371 { 1372 UCHAR *pDvbAncData = NULL; 1373 AAC_DECODER_ERROR ancErr; 1374 int ancIndex; 1375 int dvbAncDataSize = 0; 1376 1377 /* Ask how many anc data elements are in buffer */ 1378 ancIndex = self->ancData.nrElements - 1; 1379 /* Get the last one (if available) */ 1380 ancErr = CAacDecoder_AncDataGet( &self->ancData, 1381 ancIndex, 1382 &pDvbAncData, 1383 &dvbAncDataSize ); 1384 1385 if (ancErr == AAC_DEC_OK) { 1386 pcmDmx_ReadDvbAncData ( 1387 self->hPcmUtils, 1388 pDvbAncData, 1389 dvbAncDataSize, 1390 0 /* not mpeg2 */ ); 1391 } 1392 } 1393 break; 1394 1395 #ifdef TP_PCE_ENABLE 1396 case ID_PCE: 1397 1398 if ( CProgramConfigElement_Read( bs, 1399 self->hInput, 1400 pce, 1401 self->streamInfo.channelConfig, 1402 auStartAnchor ) ) 1403 { /* Built element table */ 1404 int elIdx = CProgramConfig_GetElementTable(pce, self->elements, 7); 1405 /* Reset the remaining tabs */ 1406 for ( ; elIdx<7; elIdx++) { 1407 self->elements[elIdx] = ID_NONE; 1408 } 1409 /* Make new number of channel persistant */ 1410 self->ascChannels = pce->NumChannels; 1411 /* If PCE is not first element conceal this frame to avoid inconsistencies */ 1412 if ( element_count != 0 ) { 1413 self->frameOK = 0; 1414 } 1415 } 1416 pceRead = 1; 1417 break; 1418 #endif /* TP_PCE_ENABLE */ 1419 1420 case ID_FIL: 1421 { 1422 int bitCnt = FDKreadBits(bs,4); /* bs_count */ 1423 1424 if (bitCnt == 15) 1425 { 1426 int esc_count = FDKreadBits(bs,8); /* bs_esc_count */ 1427 bitCnt = esc_count + 14; 1428 } 1429 1430 /* Convert to bits */ 1431 bitCnt <<= 3; 1432 1433 while (bitCnt > 0) { 1434 ErrorStatus = CAacDecoder_ExtPayloadParse(self, bs, &bitCnt, previous_element, previous_element_index, 1); 1435 if (ErrorStatus != AAC_DEC_OK) { 1436 self->frameOK = 0; 1437 break; 1438 } 1439 } 1440 } 1441 break; 1442 1443 case ID_EXT: 1444 { 1445 INT bitCnt = 0; 1446 1447 /* get the remaining bits of this frame */ 1448 bitCnt = transportDec_GetAuBitsRemaining(self->hInput, 0); 1449 1450 if ( (bitCnt > 0) && (self->flags & AC_SBR_PRESENT) && (self->flags & (AC_USAC|AC_RSVD50|AC_ELD)) ) 1451 { 1452 SBR_ERROR err = SBRDEC_OK; 1453 int elIdx, numChElements = el_cnt[ID_SCE] + el_cnt[ID_CPE]; 1454 1455 for (elIdx = 0; elIdx < numChElements; elIdx += 1) 1456 { 1457 err = sbrDecoder_Parse ( 1458 self->hSbrDecoder, 1459 bs, 1460 &bitCnt, 1461 -1, 1462 self->flags & AC_SBRCRC, 1463 self->elements[elIdx], 1464 elIdx, 1465 self->flags & AC_INDEP ); 1466 1467 if (err != SBRDEC_OK) { 1468 break; 1469 } 1470 } 1471 if (err == SBRDEC_OK) { 1472 self->sbrEnabled = 1; 1473 } else { 1474 self->frameOK = 0; 1475 } 1476 } 1477 1478 1479 if ( ! (self->flags & (AC_USAC|AC_RSVD50|AC_DRM)) ) 1480 { 1481 while ( bitCnt > 7 ) { 1482 ErrorStatus = CAacDecoder_ExtPayloadParse(self, bs, &bitCnt, previous_element, previous_element_index, 0); 1483 if (ErrorStatus != AAC_DEC_OK) { 1484 self->frameOK = 0; 1485 ErrorStatus = AAC_DEC_PARSE_ERROR; 1486 break; 1487 } 1488 } 1489 } 1490 } 1491 break; 1492 1493 case ID_END: 1494 break; 1495 1496 default: 1497 ErrorStatus = AAC_DEC_DECODE_FRAME_ERROR; 1498 self->frameOK = 0; 1499 break; 1500 } 1501 1502 previous_element = type; 1503 element_count++; 1504 1505 } /* while ( (type != ID_END) ... ) */ 1506 1507 if ( !(flags & (AACDEC_CONCEAL|AACDEC_FLUSH)) ) 1508 { 1509 /* Byte alignment with respect to the first bit of the raw_data_block(). */ 1510 { 1511 FDKbyteAlign(bs, auStartAnchor); 1512 } 1513 1514 /* Check if all bits of the raw_data_block() have been read. */ 1515 if ( transportDec_GetAuBitsTotal(self->hInput, 0) > 0 ) { 1516 INT unreadBits = transportDec_GetAuBitsRemaining(self->hInput, 0); 1517 if ( unreadBits != 0 ) { 1518 1519 self->frameOK = 0; 1520 /* Do not overwrite current error */ 1521 if (ErrorStatus == AAC_DEC_OK && self->frameOK == 0) { 1522 ErrorStatus = AAC_DEC_PARSE_ERROR; 1523 } 1524 /* Always put the bitbuffer at the right position after the current Access Unit. */ 1525 FDKpushBiDirectional(bs, unreadBits); 1526 } 1527 } 1528 1529 /* Check the last element. The terminator (ID_END) has to be the last one (even if ER syntax is used). */ 1530 if ( self->frameOK && type != ID_END ) { 1531 /* Do not overwrite current error */ 1532 if (ErrorStatus == AAC_DEC_OK) { 1533 ErrorStatus = AAC_DEC_PARSE_ERROR; 1534 } 1535 self->frameOK = 0; 1536 } 1537 } 1538 1539 /* More AAC channels than specified by the ASC not allowed. */ 1540 if ( (aacChannels == 0 || aacChannels > self->aacChannels) && !(flags & (AACDEC_CONCEAL|AACDEC_FLUSH)) ) { 1541 { 1542 /* Do not overwrite current error */ 1543 if (ErrorStatus == AAC_DEC_OK) { 1544 ErrorStatus = AAC_DEC_DECODE_FRAME_ERROR; 1545 } 1546 self->frameOK = 0; 1547 } 1548 aacChannels = 0; 1549 } 1550 else if ( aacChannels > self->ascChannels ) { 1551 /* Do not overwrite current error */ 1552 if (ErrorStatus == AAC_DEC_OK) { 1553 ErrorStatus = AAC_DEC_UNSUPPORTED_FORMAT; 1554 } 1555 self->frameOK = 0; 1556 aacChannels = 0; 1557 } 1558 1559 if ( TRANSPORTDEC_OK != transportDec_CrcCheck(self->hInput) ) 1560 { 1561 self->frameOK=0; 1562 } 1563 1564 /* store or restore the number of channels */ 1565 if ( self->frameOK && !(flags &(AACDEC_CONCEAL|AACDEC_FLUSH)) ) { 1566 self->concealChannels = aacChannels; /* store */ 1567 self->sbrEnabledPrev = self->sbrEnabled; 1568 } else { 1569 if (self->aacChannels > 0) { 1570 aacChannels = self->concealChannels; /* restore */ 1571 self->sbrEnabled = self->sbrEnabledPrev; 1572 } 1573 } 1574 1575 /* Update number of output channels */ 1576 self->streamInfo.numChannels = aacChannels; 1577 1578 #ifdef TP_PCE_ENABLE 1579 if (pceRead == 1 && CProgramConfig_IsValid(pce)) { 1580 /* Set matrix mixdown infos if available from PCE. */ 1581 pcmDmx_SetMatrixMixdownFromPce ( self->hPcmUtils, 1582 pce->MatrixMixdownIndexPresent, 1583 pce->MatrixMixdownIndex, 1584 pce->PseudoSurroundEnable ); 1585 } 1586 #endif 1587 1588 /* If there is no valid data to transfrom into time domain, return. */ 1589 if ( ! IS_OUTPUT_VALID(ErrorStatus) ) { 1590 return ErrorStatus; 1591 } 1592 1593 /* 1594 Inverse transform 1595 */ 1596 { 1597 int stride, offset, c; 1598 1599 /* Extract DRC control data and map it to channels (without bitstream delay) */ 1600 aacDecoder_drcProlog ( 1601 self->hDrcInfo, 1602 bs, 1603 self->pAacDecoderStaticChannelInfo, 1604 self->pce.ElementInstanceTag, 1605 self->chMapping, 1606 aacChannels 1607 ); 1608 1609 /* "c" iterates in canonical MPEG channel order */ 1610 for (c=0; c < aacChannels; c++) 1611 { 1612 CAacDecoderChannelInfo *pAacDecoderChannelInfo; 1613 1614 /* Select correct pAacDecoderChannelInfo for current channel */ 1615 if (self->chMapping[c] >= aacChannels) { 1616 pAacDecoderChannelInfo = self->pAacDecoderChannelInfo[c]; 1617 } else { 1618 pAacDecoderChannelInfo = self->pAacDecoderChannelInfo[self->chMapping[c]]; 1619 } 1620 1621 /* Setup offset and stride for time buffer traversal. */ 1622 if (interleaved) { 1623 stride = aacChannels; 1624 offset = self->channelOutputMapping[aacChannels-1][c]; 1625 } else { 1626 stride = 1; 1627 offset = self->channelOutputMapping[aacChannels-1][c] * self->streamInfo.aacSamplesPerFrame; 1628 } 1629 1630 1631 /* 1632 Conceal defective spectral data 1633 */ 1634 CConcealment_Apply(&self->pAacDecoderStaticChannelInfo[c]->concealmentInfo, 1635 pAacDecoderChannelInfo, 1636 self->pAacDecoderStaticChannelInfo[c], 1637 &self->samplingRateInfo, 1638 self->streamInfo.aacSamplesPerFrame, 1639 0, 1640 (self->frameOK && !(flags&AACDEC_CONCEAL)), 1641 self->flags 1642 ); 1643 1644 1645 if (flags & (AACDEC_INTR|AACDEC_CLRHIST)) { 1646 /* Reset DRC control data for this channel */ 1647 aacDecoder_drcInitChannelData ( &self->pAacDecoderStaticChannelInfo[c]->drcData ); 1648 } 1649 /* DRC processing */ 1650 aacDecoder_drcApply ( 1651 self->hDrcInfo, 1652 self->hSbrDecoder, 1653 pAacDecoderChannelInfo, 1654 &self->pAacDecoderStaticChannelInfo[c]->drcData, 1655 c, 1656 self->streamInfo.aacSamplesPerFrame, 1657 self->sbrEnabled 1658 ); 1659 1660 switch (pAacDecoderChannelInfo->renderMode) 1661 { 1662 case AACDEC_RENDER_IMDCT: 1663 CBlock_FrequencyToTime( 1664 self->pAacDecoderStaticChannelInfo[c], 1665 pAacDecoderChannelInfo, 1666 pTimeData + offset, 1667 self->streamInfo.aacSamplesPerFrame, 1668 stride, 1669 (self->frameOK && !(flags&AACDEC_CONCEAL)), 1670 self->aacCommonData.workBufferCore1->mdctOutTemp 1671 ); 1672 break; 1673 case AACDEC_RENDER_ELDFB: 1674 CBlock_FrequencyToTimeLowDelay( 1675 self->pAacDecoderStaticChannelInfo[c], 1676 pAacDecoderChannelInfo, 1677 pTimeData + offset, 1678 self->streamInfo.aacSamplesPerFrame, 1679 stride 1680 ); 1681 break; 1682 default: 1683 ErrorStatus = AAC_DEC_UNKNOWN; 1684 break; 1685 } 1686 if ( flags&AACDEC_FLUSH ) { 1687 FDKmemclear(pAacDecoderChannelInfo->pSpectralCoefficient, sizeof(FIXP_DBL)*self->streamInfo.aacSamplesPerFrame); 1688 FDKmemclear(self->pAacDecoderStaticChannelInfo[c]->pOverlapBuffer, OverlapBufferSize*sizeof(FIXP_DBL)); 1689 } 1690 } 1691 1692 1693 /* Extract DRC control data and map it to channels (with bitstream delay) */ 1694 aacDecoder_drcEpilog ( 1695 self->hDrcInfo, 1696 bs, 1697 self->pAacDecoderStaticChannelInfo, 1698 self->pce.ElementInstanceTag, 1699 self->chMapping, 1700 aacChannels 1701 ); 1702 } 1703 1704 1705 /* Reorder channel type information tables. */ 1706 { 1707 AUDIO_CHANNEL_TYPE types[(6)]; 1708 UCHAR idx[(6)]; 1709 int c; 1710 1711 FDK_ASSERT(sizeof(self->channelType) == sizeof(types)); 1712 FDK_ASSERT(sizeof(self->channelIndices) == sizeof(idx)); 1713 1714 FDKmemcpy(types, self->channelType, sizeof(types)); 1715 FDKmemcpy(idx, self->channelIndices, sizeof(idx)); 1716 1717 for (c=0; c<aacChannels; c++) { 1718 self->channelType[self->channelOutputMapping[aacChannels-1][c]] = types[c]; 1719 self->channelIndices[self->channelOutputMapping[aacChannels-1][c]] = idx[c]; 1720 } 1721 } 1722 1723 self->blockNumber++; 1724 1725 return ErrorStatus; 1726 } 1727 1728 /*! 1729 \brief returns the streaminfo pointer 1730 1731 The function hands back a pointer to the streaminfo structure 1732 1733 \return pointer to the struct 1734 */ 1735 LINKSPEC_CPP CStreamInfo* CAacDecoder_GetStreamInfo ( HANDLE_AACDECODER self ) 1736 { 1737 if (!self) { 1738 return NULL; 1739 } 1740 return &self->streamInfo; 1741 } 1742 1743 1744 1745 1746
