1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /* 19 ------------------------------------------------------------------------------ 20 21 PacketVideo Corp. 22 MP3 Decoder Library 23 24 Filename: pvmp3_framedecoder.cpp 25 26 Functions: 27 pvmp3_framedecoder 28 pvmp3_InitDecoder 29 pvmp3_resetDecoder 30 31 Date: 09/21/2007 32 33 ------------------------------------------------------------------------------ 34 REVISION HISTORY 35 36 37 Description: 38 39 ------------------------------------------------------------------------------ 40 INPUT AND OUTPUT DEFINITIONS 41 42 Input 43 pExt = pointer to the external interface structure. See the file 44 pvmp3decoder_api.h for a description of each field. 45 Data type of pointer to a tPVMP3DecoderExternal 46 structure. 47 48 pMem = void pointer to hide the internal implementation of the library 49 It is cast back to a tmp3dec_file structure. This structure 50 contains information that needs to persist between calls to 51 this function, or is too big to be placed on the stack, even 52 though the data is only needed during execution of this function 53 Data type void pointer, internally pointer to a tmp3dec_file 54 structure. 55 56 57 Outputs: 58 status = ERROR condition. see structure ERROR_CODE 59 60 Pointers and Buffers Modified: 61 pMem contents are modified. 62 pExt: (more detail in the file pvmp3decoder_api.h) 63 inputBufferUsedLength - number of array elements used up by the stream. 64 samplingRate - sampling rate in samples per sec 65 bitRate - bit rate in bits per second, varies frame to frame. 66 67 68 69 ------------------------------------------------------------------------------ 70 FUNCTIONS DESCRIPTION 71 72 pvmp3_framedecoder 73 frame decoder library driver 74 pvmp3_InitDecoder 75 Decoder Initialization 76 pvmp3_resetDecoder 77 Reset Decoder 78 79 ------------------------------------------------------------------------------ 80 REQUIREMENTS 81 82 83 ------------------------------------------------------------------------------ 84 REFERENCES 85 86 [1] ISO MPEG Audio Subgroup Software Simulation Group (1996) 87 ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension 88 89 ------------------------------------------------------------------------------ 90 PSEUDO-CODE 91 92 ------------------------------------------------------------------------------ 93 */ 94 95 96 /*---------------------------------------------------------------------------- 97 ; INCLUDES 98 ----------------------------------------------------------------------------*/ 99 100 101 #include "pvmp3_framedecoder.h" 102 #include "pvmp3_dec_defs.h" 103 #include "pvmp3_poly_phase_synthesis.h" 104 #include "pvmp3_tables.h" 105 #include "pvmp3_imdct_synth.h" 106 #include "pvmp3_alias_reduction.h" 107 #include "pvmp3_reorder.h" 108 #include "pvmp3_dequantize_sample.h" 109 #include "pvmp3_stereo_proc.h" 110 #include "pvmp3_mpeg2_stereo_proc.h" 111 #include "pvmp3_get_side_info.h" 112 #include "pvmp3_get_scale_factors.h" 113 #include "pvmp3_mpeg2_get_scale_factors.h" 114 #include "pvmp3_decode_header.h" 115 #include "pvmp3_get_main_data_size.h" 116 #include "s_tmp3dec_file.h" 117 #include "pvmp3_getbits.h" 118 #include "mp3_mem_funcs.h" 119 120 121 /*---------------------------------------------------------------------------- 122 ; MACROS 123 ; Define module specific macros here 124 ----------------------------------------------------------------------------*/ 125 126 127 /*---------------------------------------------------------------------------- 128 ; DEFINES 129 ; Include all pre-processor statements here. Include conditional 130 ; compile variables also. 131 ----------------------------------------------------------------------------*/ 132 133 /*---------------------------------------------------------------------------- 134 ; LOCAL FUNCTION DEFINITIONS 135 ; Function Prototype declaration 136 ----------------------------------------------------------------------------*/ 137 138 /*---------------------------------------------------------------------------- 139 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 140 ; Variable declaration - defined here and used outside this module 141 ----------------------------------------------------------------------------*/ 142 143 /*---------------------------------------------------------------------------- 144 ; EXTERNAL FUNCTION REFERENCES 145 ; Declare functions defined elsewhere and referenced in this module 146 ----------------------------------------------------------------------------*/ 147 148 /*---------------------------------------------------------------------------- 149 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 150 ; Declare variables used in this module but defined elsewhere 151 ----------------------------------------------------------------------------*/ 152 153 /*---------------------------------------------------------------------------- 154 ; FUNCTION CODE 155 ----------------------------------------------------------------------------*/ 156 157 ERROR_CODE pvmp3_framedecoder(tPVMP3DecoderExternal *pExt, 158 void *pMem) 159 { 160 161 ERROR_CODE errorCode = NO_DECODING_ERROR; 162 163 int32 crc_error_count = 0; 164 uint32 sent_crc = 0; 165 uint32 computed_crc = 0; 166 167 tmp3dec_chan *pChVars[CHAN]; 168 tmp3dec_file *pVars = (tmp3dec_file *)pMem; 169 170 mp3Header info_data; 171 mp3Header *info = &info_data; 172 173 pVars->inputStream.pBuffer = pExt->pInputBuffer; 174 175 176 pVars->inputStream.usedBits = pExt->inputBufferUsedLength << 3; 177 pVars->inputStream.inputBufferCurrentLength = pExt->inputBufferCurrentLength; 178 179 180 errorCode = pvmp3_decode_header(&pVars->inputStream, 181 info, 182 &computed_crc); 183 184 if (errorCode != NO_DECODING_ERROR) 185 { 186 pExt->outputFrameSize = 0; 187 return errorCode; 188 } 189 190 pVars->num_channels = (info->mode == MPG_MD_MONO) ? 1 : 2; 191 pExt->num_channels = pVars->num_channels; 192 193 int32 outputFrameSize = (info->version_x == MPEG_1) ? 194 2 * SUBBANDS_NUMBER * FILTERBANK_BANDS : 195 SUBBANDS_NUMBER * FILTERBANK_BANDS; 196 197 outputFrameSize = (info->mode == MPG_MD_MONO) ? outputFrameSize : outputFrameSize << 1; 198 199 200 /* 201 * Check if output buffer has enough room to hold output PCM 202 */ 203 if (pExt->outputFrameSize >= outputFrameSize) 204 { 205 pExt->outputFrameSize = outputFrameSize; 206 } 207 else 208 { 209 pExt->outputFrameSize = 0; 210 return OUTPUT_BUFFER_TOO_SMALL; 211 } 212 213 214 pChVars[ LEFT] = &pVars->perChan[ LEFT]; 215 pChVars[RIGHT] = &pVars->perChan[RIGHT]; 216 217 218 219 220 if (info->error_protection) 221 { 222 /* 223 * Get crc content 224 */ 225 sent_crc = getUpTo17bits(&pVars->inputStream, 16); 226 } 227 228 229 if (info->layer_description == 3) 230 { 231 int32 gr; 232 int32 ch; 233 uint32 main_data_end; 234 int32 bytes_to_discard; 235 int16 *ptrOutBuffer = pExt->pOutputBuffer; 236 237 /* 238 * Side Information must be extracted from the bitstream and store for use 239 * during the decoded of the associated frame 240 */ 241 242 errorCode = pvmp3_get_side_info(&pVars->inputStream, 243 &pVars->sideInfo, 244 info, 245 &computed_crc); 246 247 if (errorCode != NO_DECODING_ERROR) 248 { 249 pExt->outputFrameSize = 0; 250 return errorCode; 251 } 252 253 /* 254 * If CRC was sent, check that matches the one got while parsing data 255 * disable crc if this is the desired mode 256 */ 257 if (info->error_protection) 258 { 259 if ((computed_crc != sent_crc) && pExt->crcEnabled) 260 { 261 crc_error_count++; 262 } 263 } 264 265 /* 266 * main data (scalefactors, Huffman coded, etc,) are not necessarily located 267 * adjacent to the side-info. Beginning of main data is located using 268 * field "main_data_begin" of the current frame. The length does not include 269 * header and side info. 270 * "main_data_begin" points to the first bit of main data of a frame. It is a negative 271 * offset in bytes from the first byte of the sync word 272 * main_data_begin = 0 <===> main data start rigth after side info. 273 */ 274 275 int32 temp = pvmp3_get_main_data_size(info, pVars); 276 277 278 /* 279 * Check if available data holds a full frame, if not flag an error 280 */ 281 282 if ((uint32)pVars->predicted_frame_size > pVars->inputStream.inputBufferCurrentLength) 283 { 284 pExt->outputFrameSize = 0; 285 return NO_ENOUGH_MAIN_DATA_ERROR; 286 } 287 288 /* 289 * Fill in internal circular buffer 290 */ 291 fillMainDataBuf(pVars, temp); 292 293 294 main_data_end = pVars->mainDataStream.usedBits >> 3; /* in bytes */ 295 if ((main_data_end << 3) < pVars->mainDataStream.usedBits) 296 { 297 main_data_end++; 298 pVars->mainDataStream.usedBits = main_data_end << 3; 299 } 300 301 302 bytes_to_discard = pVars->frame_start - pVars->sideInfo.main_data_begin - main_data_end; 303 304 305 if (main_data_end > BUFSIZE) /* check overflow on the buffer */ 306 { 307 pVars->frame_start -= BUFSIZE; 308 309 pVars->mainDataStream.usedBits -= (BUFSIZE << 3); 310 } 311 312 pVars->frame_start += temp; 313 314 315 if (bytes_to_discard < 0 || crc_error_count) 316 { 317 /* 318 * Not enough data to decode, then we should avoid reading this 319 * data ( getting/ignoring sido info and scale data) 320 * Main data could be located in the previous frame, so an unaccounted 321 * frame can cause incorrect processing 322 * Just run the polyphase filter to "clean" the history buffer 323 */ 324 errorCode = NO_ENOUGH_MAIN_DATA_ERROR; 325 326 /* 327 * Clear the input to these filters 328 */ 329 330 pv_memset((void*)pChVars[RIGHT]->work_buf_int32, 331 0, 332 SUBBANDS_NUMBER*FILTERBANK_BANDS*sizeof(pChVars[RIGHT]->work_buf_int32[0])); 333 334 pv_memset((void*)pChVars[LEFT]->work_buf_int32, 335 0, 336 SUBBANDS_NUMBER*FILTERBANK_BANDS*sizeof(pChVars[LEFT]->work_buf_int32[0])); 337 338 /* clear circular buffers, to avoid any glitch */ 339 pv_memset((void*)&pChVars[ LEFT]->circ_buffer[576], 340 0, 341 480*sizeof(pChVars[ LEFT]->circ_buffer[0])); 342 pv_memset((void*)&pChVars[RIGHT]->circ_buffer[576], 343 0, 344 480*sizeof(pChVars[RIGHT]->circ_buffer[0])); 345 346 pChVars[ LEFT]->used_freq_lines = 575; 347 pChVars[RIGHT]->used_freq_lines = 575; 348 349 } 350 else 351 { 352 pVars->mainDataStream.usedBits += (bytes_to_discard << 3); 353 } 354 355 /* 356 * if (fr_ps->header->version_x == MPEG_1), use 2 granules, otherwise just 1 357 */ 358 for (gr = 0; gr < (1 + !(info->version_x)); gr++) 359 { 360 if (errorCode != NO_ENOUGH_MAIN_DATA_ERROR) 361 { 362 for (ch = 0; ch < pVars->num_channels; ch++) 363 { 364 int32 part2_start = pVars->mainDataStream.usedBits; 365 366 if (info->version_x == MPEG_1) 367 { 368 369 pvmp3_get_scale_factors(&pVars->scaleFactors[ch], 370 &pVars->sideInfo, 371 gr, 372 ch, 373 &pVars->mainDataStream); 374 } 375 else 376 { 377 int32 * tmp = pVars->Scratch_mem; 378 pvmp3_mpeg2_get_scale_factors(&pVars->scaleFactors[ch], 379 &pVars->sideInfo, 380 gr, 381 ch, 382 info, 383 (uint32 *)tmp, 384 &pVars->mainDataStream); 385 } 386 387 pChVars[ch]->used_freq_lines = pvmp3_huffman_parsing(pChVars[ch]->work_buf_int32, 388 &pVars->sideInfo.ch[ch].gran[gr], 389 pVars, 390 part2_start, 391 info); 392 393 394 pvmp3_dequantize_sample(pChVars[ch]->work_buf_int32, 395 &pVars->scaleFactors[ch], 396 &pVars->sideInfo.ch[ch].gran[gr], 397 pChVars[ch]->used_freq_lines, 398 info); 399 400 401 402 403 } /* for (ch=0; ch<stereo; ch++) */ 404 405 if (pVars->num_channels == 2) 406 { 407 408 int32 used_freq_lines = (pChVars[ LEFT]->used_freq_lines > 409 pChVars[RIGHT]->used_freq_lines) ? 410 pChVars[ LEFT]->used_freq_lines : 411 pChVars[RIGHT]->used_freq_lines; 412 413 pChVars[ LEFT]->used_freq_lines = used_freq_lines; 414 pChVars[RIGHT]->used_freq_lines = used_freq_lines; 415 416 if (info->version_x == MPEG_1) 417 { 418 pvmp3_stereo_proc(pChVars[ LEFT]->work_buf_int32, 419 pChVars[RIGHT]->work_buf_int32, 420 &pVars->scaleFactors[RIGHT], 421 &pVars->sideInfo.ch[LEFT].gran[gr], 422 used_freq_lines, 423 info); 424 } 425 else 426 { 427 int32 * tmp = pVars->Scratch_mem; 428 pvmp3_mpeg2_stereo_proc(pChVars[ LEFT]->work_buf_int32, 429 pChVars[RIGHT]->work_buf_int32, 430 &pVars->scaleFactors[RIGHT], 431 &pVars->sideInfo.ch[ LEFT].gran[gr], 432 &pVars->sideInfo.ch[RIGHT].gran[gr], 433 (uint32 *)tmp, 434 used_freq_lines, 435 info); 436 } 437 } 438 439 } /* if ( errorCode != NO_ENOUGH_MAIN_DATA_ERROR) */ 440 441 for (ch = 0; ch < pVars->num_channels; ch++) 442 { 443 444 pvmp3_reorder(pChVars[ch]->work_buf_int32, 445 &pVars->sideInfo.ch[ch].gran[gr], 446 &pChVars[ ch]->used_freq_lines, 447 info, 448 pVars->Scratch_mem); 449 450 pvmp3_alias_reduction(pChVars[ch]->work_buf_int32, 451 &pVars->sideInfo.ch[ch].gran[gr], 452 &pChVars[ ch]->used_freq_lines, 453 info); 454 455 456 /* 457 * IMDCT 458 */ 459 /* set mxposition 460 * In case of mixed blocks, # of bands with long 461 * blocks (2 or 4) else 0 462 */ 463 uint16 mixedBlocksLongBlocks = 0; /* 0 = long or short, 2=mixed, 4=mixed 2.5@8000 */ 464 if (pVars->sideInfo.ch[ch].gran[gr].mixed_block_flag && 465 pVars->sideInfo.ch[ch].gran[gr].window_switching_flag) 466 { 467 if ((info->version_x == MPEG_2_5) && (info->sampling_frequency == 2)) 468 { 469 mixedBlocksLongBlocks = 4; /* mpeg2.5 @ 8 KHz */ 470 } 471 else 472 { 473 mixedBlocksLongBlocks = 2; 474 } 475 } 476 477 pvmp3_imdct_synth(pChVars[ch]->work_buf_int32, 478 pChVars[ch]->overlap, 479 pVars->sideInfo.ch[ch].gran[gr].block_type, 480 mixedBlocksLongBlocks, 481 pChVars[ ch]->used_freq_lines, 482 pVars->Scratch_mem); 483 484 485 /* 486 * Polyphase synthesis 487 */ 488 489 pvmp3_poly_phase_synthesis(pChVars[ch], 490 pVars->num_channels, 491 pExt->equalizerType, 492 &ptrOutBuffer[ch]); 493 494 495 }/* end ch loop */ 496 497 ptrOutBuffer += pVars->num_channels * SUBBANDS_NUMBER * FILTERBANK_BANDS; 498 } /* for (gr=0;gr<Max_gr;gr++) */ 499 500 /* skip ancillary data */ 501 if (info->bitrate_index > 0) 502 { /* if not free-format */ 503 504 int32 ancillary_data_lenght = pVars->predicted_frame_size << 3; 505 506 ancillary_data_lenght -= pVars->inputStream.usedBits; 507 508 /* skip ancillary data */ 509 if (ancillary_data_lenght > 0) 510 { 511 pVars->inputStream.usedBits += ancillary_data_lenght; 512 } 513 514 } 515 516 /* 517 * This overrides a possible NO_ENOUGH_MAIN_DATA_ERROR 518 */ 519 errorCode = NO_DECODING_ERROR; 520 521 } 522 else 523 { 524 /* 525 * The info on the header leads to an unsupported layer, more data 526 * will not fix this, so this is a bad frame, 527 */ 528 529 pExt->outputFrameSize = 0; 530 return UNSUPPORTED_LAYER; 531 } 532 533 pExt->inputBufferUsedLength = pVars->inputStream.usedBits >> 3; 534 pExt->totalNumberOfBitsUsed += pVars->inputStream.usedBits; 535 pExt->version = info->version_x; 536 pExt->samplingRate = mp3_s_freq[info->version_x][info->sampling_frequency]; 537 pExt->bitRate = mp3_bitrate[pExt->version][info->bitrate_index]; 538 539 540 /* 541 * Always verify buffer overrun condition 542 */ 543 544 if (pExt->inputBufferUsedLength > pExt->inputBufferCurrentLength) 545 { 546 pExt->outputFrameSize = 0; 547 errorCode = NO_ENOUGH_MAIN_DATA_ERROR; 548 } 549 550 return errorCode; 551 552 } 553 554 555 /*---------------------------------------------------------------------------- 556 ; FUNCTION CODE 557 ----------------------------------------------------------------------------*/ 558 559 __inline void fillDataBuf(tmp3Bits *pMainData, 560 uint32 val) /* val to write into the buffer */ 561 { 562 pMainData->pBuffer[module(pMainData->offset++, BUFSIZE)] = (uint8)val; 563 } 564 565 566 void fillMainDataBuf(void *pMem, int32 temp) 567 { 568 tmp3dec_file *pVars = (tmp3dec_file *)pMem; 569 570 571 int32 offset = (pVars->inputStream.usedBits) >> INBUF_ARRAY_INDEX_SHIFT; 572 573 /* 574 * Check if input circular buffer boundaries need to be enforced 575 */ 576 if ((offset + temp) < BUFSIZE) 577 { 578 uint8 * ptr = pVars->inputStream.pBuffer + offset; 579 580 offset = pVars->mainDataStream.offset; 581 582 /* 583 * Check if main data circular buffer boundaries need to be enforced 584 */ 585 if ((offset + temp) < BUFSIZE) 586 { 587 pv_memcpy((pVars->mainDataStream.pBuffer + offset), ptr, temp*sizeof(uint8)); 588 pVars->mainDataStream.offset += temp; 589 } 590 else 591 { 592 int32 tmp1 = *(ptr++); 593 for (int32 nBytes = temp >> 1; nBytes != 0; nBytes--) /* read main data. */ 594 { 595 int32 tmp2 = *(ptr++); 596 fillDataBuf(&pVars->mainDataStream, tmp1); 597 fillDataBuf(&pVars->mainDataStream, tmp2); 598 tmp1 = *(ptr++); 599 } 600 601 if (temp&1) 602 { 603 fillDataBuf(&pVars->mainDataStream, tmp1); 604 } 605 606 /* adjust circular buffer counter */ 607 pVars->mainDataStream.offset = module(pVars->mainDataStream.offset, BUFSIZE); 608 } 609 } 610 else 611 { 612 for (int32 nBytes = temp >> 1; nBytes != 0; nBytes--) /* read main data. */ 613 { 614 fillDataBuf(&pVars->mainDataStream, *(pVars->inputStream.pBuffer + module(offset++ , BUFSIZE))); 615 fillDataBuf(&pVars->mainDataStream, *(pVars->inputStream.pBuffer + module(offset++ , BUFSIZE))); 616 } 617 if (temp&1) 618 { 619 fillDataBuf(&pVars->mainDataStream, *(pVars->inputStream.pBuffer + module(offset , BUFSIZE))); 620 } 621 } 622 623 624 pVars->inputStream.usedBits += (temp) << INBUF_ARRAY_INDEX_SHIFT; 625 } 626 627 628 629 630 /*---------------------------------------------------------------------------- 631 ; FUNCTION CODE 632 ----------------------------------------------------------------------------*/ 633 634 uint32 pvmp3_decoderMemRequirements(void) 635 { 636 uint32 size; 637 638 size = (uint32) sizeof(tmp3dec_file); 639 return (size); 640 } 641 642 643 644 /*---------------------------------------------------------------------------- 645 ; FUNCTION CODE 646 ----------------------------------------------------------------------------*/ 647 648 #include "pvmp3_decode_huff_cw.h" 649 650 void pvmp3_InitDecoder(tPVMP3DecoderExternal *pExt, 651 void *pMem) 652 { 653 654 tmp3dec_file *pVars; 655 huffcodetab *pHuff; 656 657 pVars = (tmp3dec_file *)pMem; 658 659 pVars->num_channels = 0; 660 661 pExt->totalNumberOfBitsUsed = 0; 662 pExt->inputBufferCurrentLength = 0; 663 pExt->inputBufferUsedLength = 0; 664 665 pVars->mainDataStream.offset = 0; 666 667 pv_memset((void*)pVars->mainDataBuffer, 668 0, 669 BUFSIZE*sizeof(*pVars->mainDataBuffer)); 670 671 672 pVars->inputStream.pBuffer = pExt->pInputBuffer; 673 674 /* 675 * Initialize huffman decoding table 676 */ 677 678 pHuff = pVars->ht; 679 pHuff[0].linbits = 0; 680 pHuff[0].pdec_huff_tab = pvmp3_decode_huff_cw_tab0; 681 pHuff[1].linbits = 0; 682 pHuff[1].pdec_huff_tab = pvmp3_decode_huff_cw_tab1; 683 pHuff[2].linbits = 0; 684 pHuff[2].pdec_huff_tab = pvmp3_decode_huff_cw_tab2; 685 pHuff[3].linbits = 0; 686 pHuff[3].pdec_huff_tab = pvmp3_decode_huff_cw_tab3; 687 pHuff[4].linbits = 0; 688 pHuff[4].pdec_huff_tab = pvmp3_decode_huff_cw_tab0; /* tbl 4 is not used */ 689 pHuff[5].linbits = 4; 690 pHuff[5].pdec_huff_tab = pvmp3_decode_huff_cw_tab5; 691 pHuff[6].linbits = 0; 692 pHuff[6].pdec_huff_tab = pvmp3_decode_huff_cw_tab6; 693 pHuff[7].linbits = 0; 694 pHuff[7].pdec_huff_tab = pvmp3_decode_huff_cw_tab7; 695 pHuff[8].linbits = 0; 696 pHuff[8].pdec_huff_tab = pvmp3_decode_huff_cw_tab8; 697 pHuff[9].linbits = 0; 698 pHuff[9].pdec_huff_tab = pvmp3_decode_huff_cw_tab9; 699 pHuff[10].linbits = 0; 700 pHuff[10].pdec_huff_tab = pvmp3_decode_huff_cw_tab10; 701 pHuff[11].linbits = 0; 702 pHuff[11].pdec_huff_tab = pvmp3_decode_huff_cw_tab11; 703 pHuff[12].linbits = 0; 704 pHuff[12].pdec_huff_tab = pvmp3_decode_huff_cw_tab12; 705 pHuff[13].linbits = 0; 706 pHuff[13].pdec_huff_tab = pvmp3_decode_huff_cw_tab13; 707 pHuff[14].linbits = 0; 708 pHuff[14].pdec_huff_tab = pvmp3_decode_huff_cw_tab0; /* tbl 14 is not used */ 709 pHuff[15].linbits = 0; 710 pHuff[15].pdec_huff_tab = pvmp3_decode_huff_cw_tab15; 711 pHuff[16].linbits = 1; 712 pHuff[16].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; 713 pHuff[17].linbits = 2; 714 pHuff[17].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; 715 pHuff[18].linbits = 3; 716 pHuff[18].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; 717 pHuff[19].linbits = 4; 718 pHuff[19].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; 719 pHuff[20].linbits = 6; 720 pHuff[20].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; 721 pHuff[21].linbits = 8; 722 pHuff[21].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; 723 pHuff[22].linbits = 10; 724 pHuff[22].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; 725 pHuff[23].linbits = 13; 726 pHuff[23].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; 727 pHuff[24].linbits = 4; 728 pHuff[24].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; 729 pHuff[25].linbits = 5; 730 pHuff[25].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; 731 pHuff[26].linbits = 6; 732 pHuff[26].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; 733 pHuff[27].linbits = 7; 734 pHuff[27].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; 735 pHuff[28].linbits = 8; 736 pHuff[28].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; 737 pHuff[29].linbits = 9; 738 pHuff[29].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; 739 pHuff[30].linbits = 11; 740 pHuff[30].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; 741 pHuff[31].linbits = 13; 742 pHuff[31].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; 743 pHuff[32].linbits = 0; 744 pHuff[32].pdec_huff_tab = pvmp3_decode_huff_cw_tab32; 745 pHuff[33].linbits = 0; 746 pHuff[33].pdec_huff_tab = pvmp3_decode_huff_cw_tab33; 747 748 /* 749 * Initialize polysynthesis circular buffer mechanism 750 */ 751 /* clear buffers */ 752 753 pvmp3_resetDecoder(pMem); 754 755 } 756 757 758 /*---------------------------------------------------------------------------- 759 ; FUNCTION CODE 760 ----------------------------------------------------------------------------*/ 761 762 763 void pvmp3_resetDecoder(void *pMem) 764 { 765 766 tmp3dec_file *pVars; 767 tmp3dec_chan *pChVars[CHAN]; 768 769 pVars = (tmp3dec_file *)pMem; 770 pChVars[ LEFT] = &pVars->perChan[ LEFT]; 771 pChVars[RIGHT] = &pVars->perChan[RIGHT]; 772 773 pVars->frame_start = 0; 774 775 pVars->mainDataStream.offset = 0; 776 777 pVars->mainDataStream.pBuffer = pVars->mainDataBuffer; 778 pVars->mainDataStream.usedBits = 0; 779 780 781 pVars->inputStream.usedBits = 0; // in bits 782 783 784 pChVars[ LEFT]->used_freq_lines = 575; 785 pChVars[RIGHT]->used_freq_lines = 575; 786 787 788 /* 789 * Initialize polysynthesis circular buffer mechanism 790 */ 791 792 pv_memset((void*)&pChVars[ LEFT]->circ_buffer[576], 793 0, 794 480*sizeof(pChVars[ LEFT]->circ_buffer[0])); 795 pv_memset((void*)&pChVars[RIGHT]->circ_buffer[576], 796 0, 797 480*sizeof(pChVars[RIGHT]->circ_buffer[0])); 798 799 800 pv_memset((void*)pChVars[ LEFT]->overlap, 801 0, 802 SUBBANDS_NUMBER*FILTERBANK_BANDS*sizeof(pChVars[ LEFT]->overlap[0])); 803 804 805 pv_memset((void*)pChVars[ RIGHT]->overlap, 806 0, 807 SUBBANDS_NUMBER*FILTERBANK_BANDS*sizeof(pChVars[ RIGHT]->overlap[0])); 808 809 810 811 812 813 /* 814 * Clear all the structures 815 */ 816 817 818 pv_memset((void*)&pVars->scaleFactors[RIGHT], 819 0, 820 sizeof(mp3ScaleFactors)); 821 822 pv_memset((void*)&pVars->scaleFactors[LEFT], 823 0, 824 sizeof(mp3ScaleFactors)); 825 826 pv_memset((void*)&pVars->sideInfo, 827 0, 828 sizeof(mp3SideInfo)); 829 830 pv_memset((void*)&pVars->sideInfo, 831 0, 832 sizeof(mp3SideInfo)); 833 834 } 835
