1/** 2 * @file libavcodec/vorbis_dec.c 3 * Vorbis I decoder 4 * @author Denes Balatoni ( dbalatoni programozo hu ) 5 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#undef V_DEBUG 24//#define V_DEBUG 25//#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__) 26 27#include <math.h> 28 29#define ALT_BITSTREAM_READER_LE 30#include "avcodec.h" 31#include "bitstream.h" 32#include "dsputil.h" 33 34#include "vorbis.h" 35#include "xiph.h" 36 37#define V_NB_BITS 8 38#define V_NB_BITS2 11 39#define V_MAX_VLCS (1<<16) 40#define V_MAX_PARTITIONS (1<<20) 41 42#ifndef V_DEBUG 43#define AV_DEBUG(...) 44#endif 45 46#undef NDEBUG 47#include <assert.h> 48 49typedef struct { 50 uint_fast8_t dimensions; 51 uint_fast8_t lookup_type; 52 uint_fast8_t maxdepth; 53 VLC vlc; 54 float *codevectors; 55 unsigned int nb_bits; 56} vorbis_codebook; 57 58typedef union vorbis_floor_u vorbis_floor_data; 59typedef struct vorbis_floor0_s vorbis_floor0; 60typedef struct vorbis_floor1_s vorbis_floor1; 61struct vorbis_context_s; 62typedef 63uint_fast8_t (* vorbis_floor_decode_func) 64 (struct vorbis_context_s *, vorbis_floor_data *, float *); 65typedef struct { 66 uint_fast8_t floor_type; 67 vorbis_floor_decode_func decode; 68 union vorbis_floor_u 69 { 70 struct vorbis_floor0_s 71 { 72 uint_fast8_t order; 73 uint_fast16_t rate; 74 uint_fast16_t bark_map_size; 75 int_fast32_t * map[2]; 76 uint_fast32_t map_size[2]; 77 uint_fast8_t amplitude_bits; 78 uint_fast8_t amplitude_offset; 79 uint_fast8_t num_books; 80 uint_fast8_t * book_list; 81 float * lsp; 82 } t0; 83 struct vorbis_floor1_s 84 { 85 uint_fast8_t partitions; 86 uint_fast8_t maximum_class; 87 uint_fast8_t partition_class[32]; 88 uint_fast8_t class_dimensions[16]; 89 uint_fast8_t class_subclasses[16]; 90 uint_fast8_t class_masterbook[16]; 91 int_fast16_t subclass_books[16][8]; 92 uint_fast8_t multiplier; 93 uint_fast16_t x_list_dim; 94 vorbis_floor1_entry * list; 95 } t1; 96 } data; 97} vorbis_floor; 98 99typedef struct { 100 uint_fast16_t type; 101 uint_fast32_t begin; 102 uint_fast32_t end; 103 uint_fast32_t partition_size; 104 uint_fast8_t classifications; 105 uint_fast8_t classbook; 106 int_fast16_t books[64][8]; 107 uint_fast8_t maxpass; 108} vorbis_residue; 109 110typedef struct { 111 uint_fast8_t submaps; 112 uint_fast16_t coupling_steps; 113 uint_fast8_t *magnitude; 114 uint_fast8_t *angle; 115 uint_fast8_t *mux; 116 uint_fast8_t submap_floor[16]; 117 uint_fast8_t submap_residue[16]; 118} vorbis_mapping; 119 120typedef struct { 121 uint_fast8_t blockflag; 122 uint_fast16_t windowtype; 123 uint_fast16_t transformtype; 124 uint_fast8_t mapping; 125} vorbis_mode; 126 127typedef struct vorbis_context_s { 128 AVCodecContext *avccontext; 129 GetBitContext gb; 130 DSPContext dsp; 131 132 MDCTContext mdct[2]; 133 uint_fast8_t first_frame; 134 uint_fast32_t version; 135 uint_fast8_t audio_channels; 136 uint_fast32_t audio_samplerate; 137 uint_fast32_t bitrate_maximum; 138 uint_fast32_t bitrate_nominal; 139 uint_fast32_t bitrate_minimum; 140 uint_fast32_t blocksize[2]; 141 const float * win[2]; 142 uint_fast16_t codebook_count; 143 vorbis_codebook *codebooks; 144 uint_fast8_t floor_count; 145 vorbis_floor *floors; 146 uint_fast8_t residue_count; 147 vorbis_residue *residues; 148 uint_fast8_t mapping_count; 149 vorbis_mapping *mappings; 150 uint_fast8_t mode_count; 151 vorbis_mode *modes; 152 uint_fast8_t mode_number; // mode number for the current packet 153 uint_fast8_t previous_window; 154 float *channel_residues; 155 float *channel_floors; 156 float *saved; 157 uint_fast32_t add_bias; // for float->int conversion 158 uint_fast32_t exp_bias; 159} vorbis_context; 160 161/* Helper functions */ 162 163#define BARK(x) \ 164 (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x)) 165 166static float vorbisfloat2float(uint_fast32_t val) { 167 double mant=val&0x1fffff; 168 long exp=(val&0x7fe00000L)>>21; 169 if (val&0x80000000) mant=-mant; 170 return ldexp(mant, exp - 20 - 768); 171} 172 173 174// Free all allocated memory ----------------------------------------- 175 176static void vorbis_free(vorbis_context *vc) { 177 int_fast16_t i; 178 179 av_freep(&vc->channel_residues); 180 av_freep(&vc->channel_floors); 181 av_freep(&vc->saved); 182 183 av_freep(&vc->residues); 184 av_freep(&vc->modes); 185 186 ff_mdct_end(&vc->mdct[0]); 187 ff_mdct_end(&vc->mdct[1]); 188 189 for(i=0;i<vc->codebook_count;++i) { 190 av_free(vc->codebooks[i].codevectors); 191 free_vlc(&vc->codebooks[i].vlc); 192 } 193 av_freep(&vc->codebooks); 194 195 for(i=0;i<vc->floor_count;++i) { 196 if(vc->floors[i].floor_type==0) { 197 av_free(vc->floors[i].data.t0.map[0]); 198 av_free(vc->floors[i].data.t0.map[1]); 199 av_free(vc->floors[i].data.t0.book_list); 200 av_free(vc->floors[i].data.t0.lsp); 201 } 202 else { 203 av_free(vc->floors[i].data.t1.list); 204 } 205 } 206 av_freep(&vc->floors); 207 208 for(i=0;i<vc->mapping_count;++i) { 209 av_free(vc->mappings[i].magnitude); 210 av_free(vc->mappings[i].angle); 211 av_free(vc->mappings[i].mux); 212 } 213 av_freep(&vc->mappings); 214 215 if(vc->exp_bias){ 216 av_freep(&vc->win[0]); 217 av_freep(&vc->win[1]); 218 } 219} 220 221// Parse setup header ------------------------------------------------- 222 223// Process codebooks part 224 225static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) { 226 uint_fast16_t cb; 227 uint8_t *tmp_vlc_bits; 228 uint32_t *tmp_vlc_codes; 229 GetBitContext *gb=&vc->gb; 230 231 vc->codebook_count=get_bits(gb,8)+1; 232 233 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count); 234 235 vc->codebooks=av_mallocz(vc->codebook_count * sizeof(vorbis_codebook)); 236 tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t)); 237 tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t)); 238 239 for(cb=0;cb<vc->codebook_count;++cb) { 240 vorbis_codebook *codebook_setup=&vc->codebooks[cb]; 241 uint_fast8_t ordered; 242 uint_fast32_t t, used_entries=0; 243 uint_fast32_t entries; 244 245 AV_DEBUG(" %d. Codebook \n", cb); 246 247 if (get_bits(gb, 24)!=0x564342) { 248 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb); 249 goto error; 250 } 251 252 codebook_setup->dimensions=get_bits(gb, 16); 253 if (codebook_setup->dimensions>16||codebook_setup->dimensions==0) { 254 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions); 255 goto error; 256 } 257 entries=get_bits(gb, 24); 258 if (entries>V_MAX_VLCS) { 259 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries); 260 goto error; 261 } 262 263 ordered=get_bits1(gb); 264 265 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries); 266 267 if (!ordered) { 268 uint_fast16_t ce; 269 uint_fast8_t flag; 270 uint_fast8_t sparse=get_bits1(gb); 271 272 AV_DEBUG(" not ordered \n"); 273 274 if (sparse) { 275 AV_DEBUG(" sparse \n"); 276 277 used_entries=0; 278 for(ce=0;ce<entries;++ce) { 279 flag=get_bits1(gb); 280 if (flag) { 281 tmp_vlc_bits[ce]=get_bits(gb, 5)+1; 282 ++used_entries; 283 } 284 else tmp_vlc_bits[ce]=0; 285 } 286 } else { 287 AV_DEBUG(" not sparse \n"); 288 289 used_entries=entries; 290 for(ce=0;ce<entries;++ce) { 291 tmp_vlc_bits[ce]=get_bits(gb, 5)+1; 292 } 293 } 294 } else { 295 uint_fast16_t current_entry=0; 296 uint_fast8_t current_length=get_bits(gb, 5)+1; 297 298 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME 299 300 used_entries=entries; 301 for(;current_entry<used_entries;++current_length) { 302 uint_fast16_t i, number; 303 304 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry)); 305 306 number=get_bits(gb, ilog(entries - current_entry)); 307 308 AV_DEBUG(" number: %d \n", number); 309 310 for(i=current_entry;i<number+current_entry;++i) { 311 if (i<used_entries) tmp_vlc_bits[i]=current_length; 312 } 313 314 current_entry+=number; 315 } 316 if (current_entry>used_entries) { 317 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n"); 318 goto error; 319 } 320 } 321 322 codebook_setup->lookup_type=get_bits(gb, 4); 323 324 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" ); 325 326// If the codebook is used for (inverse) VQ, calculate codevectors. 327 328 if (codebook_setup->lookup_type==1) { 329 uint_fast16_t i, j, k; 330 uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions); 331 uint_fast16_t codebook_multiplicands[codebook_lookup_values]; 332 333 float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32)); 334 float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32)); 335 uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1; 336 uint_fast8_t codebook_sequence_p=get_bits1(gb); 337 338 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values); 339 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value); 340 341 for(i=0;i<codebook_lookup_values;++i) { 342 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits); 343 344 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value); 345 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]); 346 } 347 348// Weed out unused vlcs and build codevector vector 349 codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL; 350 for(j=0, i=0;i<entries;++i) { 351 uint_fast8_t dim=codebook_setup->dimensions; 352 353 if (tmp_vlc_bits[i]) { 354 float last=0.0; 355 uint_fast32_t lookup_offset=i; 356 357#ifdef V_DEBUG 358 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i); 359#endif 360 361 for(k=0;k<dim;++k) { 362 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values; 363 codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last; 364 if (codebook_sequence_p) { 365 last=codebook_setup->codevectors[j*dim+k]; 366 } 367 lookup_offset/=codebook_lookup_values; 368 } 369 tmp_vlc_bits[j]=tmp_vlc_bits[i]; 370 371#ifdef V_DEBUG 372 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j); 373 for(k=0;k<dim;++k) { 374 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]); 375 } 376 av_log(vc->avccontext, AV_LOG_INFO, "\n"); 377#endif 378 379 ++j; 380 } 381 } 382 if (j!=used_entries) { 383 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n"); 384 goto error; 385 } 386 entries=used_entries; 387 } 388 else if (codebook_setup->lookup_type>=2) { 389 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n"); 390 goto error; 391 } 392 393// Initialize VLC table 394 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) { 395 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n"); 396 goto error; 397 } 398 codebook_setup->maxdepth=0; 399 for(t=0;t<entries;++t) 400 if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t]; 401 402 if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2; 403 else codebook_setup->nb_bits=V_NB_BITS; 404 405 codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits; 406 407 if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) { 408 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n"); 409 goto error; 410 } 411 } 412 413 av_free(tmp_vlc_bits); 414 av_free(tmp_vlc_codes); 415 return 0; 416 417// Error: 418error: 419 av_free(tmp_vlc_bits); 420 av_free(tmp_vlc_codes); 421 return 1; 422} 423 424// Process time domain transforms part (unused in Vorbis I) 425 426static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) { 427 GetBitContext *gb=&vc->gb; 428 uint_fast8_t i; 429 uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1; 430 431 for(i=0;i<vorbis_time_count;++i) { 432 uint_fast16_t vorbis_tdtransform=get_bits(gb, 16); 433 434 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform); 435 436 if (vorbis_tdtransform) { 437 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n"); 438 return 1; 439 } 440 } 441 return 0; 442} 443 444// Process floors part 445 446static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc, 447 vorbis_floor_data *vfu, float *vec); 448static void create_map( vorbis_context * vc, uint_fast8_t floor_number ); 449static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, 450 vorbis_floor_data *vfu, float *vec); 451static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) { 452 GetBitContext *gb=&vc->gb; 453 uint_fast16_t i,j,k; 454 455 vc->floor_count=get_bits(gb, 6)+1; 456 457 vc->floors=av_mallocz(vc->floor_count * sizeof(vorbis_floor)); 458 459 for (i=0;i<vc->floor_count;++i) { 460 vorbis_floor *floor_setup=&vc->floors[i]; 461 462 floor_setup->floor_type=get_bits(gb, 16); 463 464 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type); 465 466 if (floor_setup->floor_type==1) { 467 uint_fast8_t maximum_class=0; 468 uint_fast8_t rangebits; 469 uint_fast16_t floor1_values=2; 470 471 floor_setup->decode=vorbis_floor1_decode; 472 473 floor_setup->data.t1.partitions=get_bits(gb, 5); 474 475 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions); 476 477 for(j=0;j<floor_setup->data.t1.partitions;++j) { 478 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4); 479 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j]; 480 481 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]); 482 483 } 484 485 AV_DEBUG(" maximum class %d \n", maximum_class); 486 487 floor_setup->data.t1.maximum_class=maximum_class; 488 489 for(j=0;j<=maximum_class;++j) { 490 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1; 491 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2); 492 493 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]); 494 495 if (floor_setup->data.t1.class_subclasses[j]) { 496 int bits=get_bits(gb, 8); 497 if (bits>=vc->codebook_count) { 498 av_log(vc->avccontext, AV_LOG_ERROR, "Masterbook index %d is out of range.\n", bits); 499 return 1; 500 } 501 floor_setup->data.t1.class_masterbook[j]=bits; 502 503 AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]); 504 } 505 506 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) { 507 int16_t bits=get_bits(gb, 8)-1; 508 if (bits!=-1 && bits>=vc->codebook_count) { 509 av_log(vc->avccontext, AV_LOG_ERROR, "Subclass book index %d is out of range.\n", bits); 510 return 1; 511 } 512 floor_setup->data.t1.subclass_books[j][k]=bits; 513 514 AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]); 515 } 516 } 517 518 floor_setup->data.t1.multiplier=get_bits(gb, 2)+1; 519 floor_setup->data.t1.x_list_dim=2; 520 521 for(j=0;j<floor_setup->data.t1.partitions;++j) { 522 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; 523 } 524 525 floor_setup->data.t1.list=av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry)); 526 527 528 rangebits=get_bits(gb, 4); 529 floor_setup->data.t1.list[0].x = 0; 530 floor_setup->data.t1.list[1].x = (1<<rangebits); 531 532 for(j=0;j<floor_setup->data.t1.partitions;++j) { 533 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) { 534 floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits); 535 536 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x); 537 } 538 } 539 540// Precalculate order of x coordinates - needed for decode 541 ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim); 542 } 543 else if(floor_setup->floor_type==0) { 544 uint_fast8_t max_codebook_dim=0; 545 546 floor_setup->decode=vorbis_floor0_decode; 547 548 floor_setup->data.t0.order=get_bits(gb, 8); 549 floor_setup->data.t0.rate=get_bits(gb, 16); 550 floor_setup->data.t0.bark_map_size=get_bits(gb, 16); 551 floor_setup->data.t0.amplitude_bits=get_bits(gb, 6); 552 /* zero would result in a div by zero later * 553 * 2^0 - 1 == 0 */ 554 if (floor_setup->data.t0.amplitude_bits == 0) { 555 av_log(vc->avccontext, AV_LOG_ERROR, 556 "Floor 0 amplitude bits is 0.\n"); 557 return 1; 558 } 559 floor_setup->data.t0.amplitude_offset=get_bits(gb, 8); 560 floor_setup->data.t0.num_books=get_bits(gb, 4)+1; 561 562 /* allocate mem for booklist */ 563 floor_setup->data.t0.book_list= 564 av_malloc(floor_setup->data.t0.num_books); 565 if(!floor_setup->data.t0.book_list) { return 1; } 566 /* read book indexes */ 567 { 568 int idx; 569 uint_fast8_t book_idx; 570 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) { 571 book_idx=get_bits(gb, 8); 572 if (book_idx>=vc->codebook_count) 573 return 1; 574 floor_setup->data.t0.book_list[idx]=book_idx; 575 if (vc->codebooks[book_idx].dimensions > max_codebook_dim) 576 max_codebook_dim=vc->codebooks[book_idx].dimensions; 577 } 578 } 579 580 create_map( vc, i ); 581 582 /* allocate mem for lsp coefficients */ 583 { 584 /* codebook dim is for padding if codebook dim doesn't * 585 * divide order+1 then we need to read more data */ 586 floor_setup->data.t0.lsp= 587 av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim) 588 * sizeof(float)); 589 if(!floor_setup->data.t0.lsp) { return 1; } 590 } 591 592#ifdef V_DEBUG /* debug output parsed headers */ 593 AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order); 594 AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate); 595 AV_DEBUG("floor0 bark map size: %u\n", 596 floor_setup->data.t0.bark_map_size); 597 AV_DEBUG("floor0 amplitude bits: %u\n", 598 floor_setup->data.t0.amplitude_bits); 599 AV_DEBUG("floor0 amplitude offset: %u\n", 600 floor_setup->data.t0.amplitude_offset); 601 AV_DEBUG("floor0 number of books: %u\n", 602 floor_setup->data.t0.num_books); 603 AV_DEBUG("floor0 book list pointer: %p\n", 604 floor_setup->data.t0.book_list); 605 { 606 int idx; 607 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) { 608 AV_DEBUG( " Book %d: %u\n", 609 idx+1, 610 floor_setup->data.t0.book_list[idx] ); 611 } 612 } 613#endif 614 } 615 else { 616 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n"); 617 return 1; 618 } 619 } 620 return 0; 621} 622 623// Process residues part 624 625static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){ 626 GetBitContext *gb=&vc->gb; 627 uint_fast8_t i, j, k; 628 629 vc->residue_count=get_bits(gb, 6)+1; 630 vc->residues=av_mallocz(vc->residue_count * sizeof(vorbis_residue)); 631 632 AV_DEBUG(" There are %d residues. \n", vc->residue_count); 633 634 for(i=0;i<vc->residue_count;++i) { 635 vorbis_residue *res_setup=&vc->residues[i]; 636 uint_fast8_t cascade[64]; 637 uint_fast8_t high_bits; 638 uint_fast8_t low_bits; 639 640 res_setup->type=get_bits(gb, 16); 641 642 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type); 643 644 res_setup->begin=get_bits(gb, 24); 645 res_setup->end=get_bits(gb, 24); 646 res_setup->partition_size=get_bits(gb, 24)+1; 647 /* Validations to prevent a buffer overflow later. */ 648 if (res_setup->begin>res_setup->end 649 || res_setup->end>vc->blocksize[1]/(res_setup->type==2?1:2) 650 || (res_setup->end-res_setup->begin)/res_setup->partition_size>V_MAX_PARTITIONS) { 651 av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %d, %d, %d, %d, %d\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1]/2); 652 return 1; 653 } 654 655 res_setup->classifications=get_bits(gb, 6)+1; 656 res_setup->classbook=get_bits(gb, 8); 657 if (res_setup->classbook>=vc->codebook_count) { 658 av_log(vc->avccontext, AV_LOG_ERROR, "classbook value %d out of range. \n", res_setup->classbook); 659 return 1; 660 } 661 662 AV_DEBUG(" begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size, 663 res_setup->classifications, res_setup->classbook); 664 665 for(j=0;j<res_setup->classifications;++j) { 666 high_bits=0; 667 low_bits=get_bits(gb, 3); 668 if (get_bits1(gb)) { 669 high_bits=get_bits(gb, 5); 670 } 671 cascade[j]=(high_bits<<3)+low_bits; 672 673 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j])); 674 } 675 676 res_setup->maxpass=0; 677 for(j=0;j<res_setup->classifications;++j) { 678 for(k=0;k<8;++k) { 679 if (cascade[j]&(1<<k)) { 680 int bits=get_bits(gb, 8); 681 if (bits>=vc->codebook_count) { 682 av_log(vc->avccontext, AV_LOG_ERROR, "book value %d out of range. \n", bits); 683 return 1; 684 } 685 res_setup->books[j][k]=bits; 686 687 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]); 688 689 if (k>res_setup->maxpass) { 690 res_setup->maxpass=k; 691 } 692 } else { 693 res_setup->books[j][k]=-1; 694 } 695 } 696 } 697 } 698 return 0; 699} 700 701// Process mappings part 702 703static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) { 704 GetBitContext *gb=&vc->gb; 705 uint_fast8_t i, j; 706 707 vc->mapping_count=get_bits(gb, 6)+1; 708 vc->mappings=av_mallocz(vc->mapping_count * sizeof(vorbis_mapping)); 709 710 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count); 711 712 for(i=0;i<vc->mapping_count;++i) { 713 vorbis_mapping *mapping_setup=&vc->mappings[i]; 714 715 if (get_bits(gb, 16)) { 716 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n"); 717 return 1; 718 } 719 if (get_bits1(gb)) { 720 mapping_setup->submaps=get_bits(gb, 4)+1; 721 } else { 722 mapping_setup->submaps=1; 723 } 724 725 if (get_bits1(gb)) { 726 mapping_setup->coupling_steps=get_bits(gb, 8)+1; 727 mapping_setup->magnitude=av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t)); 728 mapping_setup->angle =av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t)); 729 for(j=0;j<mapping_setup->coupling_steps;++j) { 730 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1)); 731 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1)); 732 if (mapping_setup->magnitude[j]>=vc->audio_channels) { 733 av_log(vc->avccontext, AV_LOG_ERROR, "magnitude channel %d out of range. \n", mapping_setup->magnitude[j]); 734 return 1; 735 } 736 if (mapping_setup->angle[j]>=vc->audio_channels) { 737 av_log(vc->avccontext, AV_LOG_ERROR, "angle channel %d out of range. \n", mapping_setup->angle[j]); 738 return 1; 739 } 740 } 741 } else { 742 mapping_setup->coupling_steps=0; 743 } 744 745 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps); 746 747 if(get_bits(gb, 2)) { 748 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i); 749 return 1; // following spec. 750 } 751 752 if (mapping_setup->submaps>1) { 753 mapping_setup->mux=av_mallocz(vc->audio_channels * sizeof(uint_fast8_t)); 754 for(j=0;j<vc->audio_channels;++j) { 755 mapping_setup->mux[j]=get_bits(gb, 4); 756 } 757 } 758 759 for(j=0;j<mapping_setup->submaps;++j) { 760 int bits; 761 skip_bits(gb, 8); // FIXME check? 762 bits=get_bits(gb, 8); 763 if (bits>=vc->floor_count) { 764 av_log(vc->avccontext, AV_LOG_ERROR, "submap floor value %d out of range. \n", bits); 765 return -1; 766 } 767 mapping_setup->submap_floor[j]=bits; 768 bits=get_bits(gb, 8); 769 if (bits>=vc->residue_count) { 770 av_log(vc->avccontext, AV_LOG_ERROR, "submap residue value %d out of range. \n", bits); 771 return -1; 772 } 773 mapping_setup->submap_residue[j]=bits; 774 775 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]); 776 } 777 } 778 return 0; 779} 780 781// Process modes part 782 783static void create_map( vorbis_context * vc, uint_fast8_t floor_number ) 784{ 785 vorbis_floor * floors=vc->floors; 786 vorbis_floor0 * vf; 787 int idx; 788 int_fast8_t blockflag; 789 int_fast32_t * map; 790 int_fast32_t n; //TODO: could theoretically be smaller? 791 792 for (blockflag=0;blockflag<2;++blockflag) 793 { 794 n=vc->blocksize[blockflag]/2; 795 floors[floor_number].data.t0.map[blockflag]= 796 av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel 797 798 map=floors[floor_number].data.t0.map[blockflag]; 799 vf=&floors[floor_number].data.t0; 800 801 for (idx=0; idx<n;++idx) { 802 map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) * 803 ((vf->bark_map_size)/ 804 BARK(vf->rate/2.0f )) ); 805 if (vf->bark_map_size-1 < map[idx]) { 806 map[idx]=vf->bark_map_size-1; 807 } 808 } 809 map[n]=-1; 810 vf->map_size[blockflag]=n; 811 } 812 813# ifdef V_DEBUG 814 for(idx=0;idx<=n;++idx) { 815 AV_DEBUG("floor0 map: map at pos %d is %d\n", 816 idx, map[idx]); 817 } 818# endif 819} 820 821static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) { 822 GetBitContext *gb=&vc->gb; 823 uint_fast8_t i; 824 825 vc->mode_count=get_bits(gb, 6)+1; 826 vc->modes=av_mallocz(vc->mode_count * sizeof(vorbis_mode)); 827 828 AV_DEBUG(" There are %d modes.\n", vc->mode_count); 829 830 for(i=0;i<vc->mode_count;++i) { 831 vorbis_mode *mode_setup=&vc->modes[i]; 832 833 mode_setup->blockflag=get_bits1(gb); 834 mode_setup->windowtype=get_bits(gb, 16); //FIXME check 835 mode_setup->transformtype=get_bits(gb, 16); //FIXME check 836 mode_setup->mapping=get_bits(gb, 8); 837 if (mode_setup->mapping>=vc->mapping_count) { 838 av_log(vc->avccontext, AV_LOG_ERROR, "mode mapping value %d out of range. \n", mode_setup->mapping); 839 return 1; 840 } 841 842 AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping); 843 } 844 return 0; 845} 846 847// Process the whole setup header using the functions above 848 849static int vorbis_parse_setup_hdr(vorbis_context *vc) { 850 GetBitContext *gb=&vc->gb; 851 852 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') || 853 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') || 854 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) { 855 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n"); 856 return 1; 857 } 858 859 if (vorbis_parse_setup_hdr_codebooks(vc)) { 860 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n"); 861 return 2; 862 } 863 if (vorbis_parse_setup_hdr_tdtransforms(vc)) { 864 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n"); 865 return 3; 866 } 867 if (vorbis_parse_setup_hdr_floors(vc)) { 868 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n"); 869 return 4; 870 } 871 if (vorbis_parse_setup_hdr_residues(vc)) { 872 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n"); 873 return 5; 874 } 875 if (vorbis_parse_setup_hdr_mappings(vc)) { 876 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n"); 877 return 6; 878 } 879 if (vorbis_parse_setup_hdr_modes(vc)) { 880 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n"); 881 return 7; 882 } 883 if (!get_bits1(gb)) { 884 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n"); 885 return 8; // framing flag bit unset error 886 } 887 888 return 0; 889} 890 891// Process the identification header 892 893static int vorbis_parse_id_hdr(vorbis_context *vc){ 894 GetBitContext *gb=&vc->gb; 895 uint_fast8_t bl0, bl1; 896 897 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') || 898 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') || 899 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) { 900 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n"); 901 return 1; 902 } 903 904 vc->version=get_bits_long(gb, 32); //FIXME check 0 905 vc->audio_channels=get_bits(gb, 8); //FIXME check >0 906 vc->audio_samplerate=get_bits_long(gb, 32); //FIXME check >0 907 vc->bitrate_maximum=get_bits_long(gb, 32); 908 vc->bitrate_nominal=get_bits_long(gb, 32); 909 vc->bitrate_minimum=get_bits_long(gb, 32); 910 bl0=get_bits(gb, 4); 911 bl1=get_bits(gb, 4); 912 vc->blocksize[0]=(1<<bl0); 913 vc->blocksize[1]=(1<<bl1); 914 if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) { 915 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n"); 916 return 3; 917 } 918 // output format int16 919 if (vc->blocksize[1]/2 * vc->audio_channels * 2 > 920 AVCODEC_MAX_AUDIO_FRAME_SIZE) { 921 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes " 922 "output packets too large.\n"); 923 return 4; 924 } 925 vc->win[0]=ff_vorbis_vwin[bl0-6]; 926 vc->win[1]=ff_vorbis_vwin[bl1-6]; 927 928 if(vc->exp_bias){ 929 int i, j; 930 for(j=0; j<2; j++){ 931 float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float)); 932 for(i=0; i<vc->blocksize[j]/2; i++) 933 win[i] = vc->win[j][i] * (1<<15); 934 vc->win[j] = win; 935 } 936 } 937 938 if ((get_bits1(gb)) == 0) { 939 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n"); 940 return 2; 941 } 942 943 vc->channel_residues= av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float)); 944 vc->channel_floors = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float)); 945 vc->saved = av_mallocz((vc->blocksize[1]/4)*vc->audio_channels * sizeof(float)); 946 vc->previous_window=0; 947 948 ff_mdct_init(&vc->mdct[0], bl0, 1); 949 ff_mdct_init(&vc->mdct[1], bl1, 1); 950 951 AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ", 952 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]); 953 954/* 955 BLK=vc->blocksize[0]; 956 for(i=0;i<BLK/2;++i) { 957 vc->win[0][i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358))); 958 } 959*/ 960 961 return 0; 962} 963 964// Process the extradata using the functions above (identification header, setup header) 965 966static av_cold int vorbis_decode_init(AVCodecContext *avccontext) { 967 vorbis_context *vc = avccontext->priv_data ; 968 uint8_t *headers = avccontext->extradata; 969 int headers_len=avccontext->extradata_size; 970 uint8_t *header_start[3]; 971 int header_len[3]; 972 GetBitContext *gb = &(vc->gb); 973 int hdr_type; 974 975 vc->avccontext = avccontext; 976 dsputil_init(&vc->dsp, avccontext); 977 978 if(vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) { 979 vc->add_bias = 385; 980 vc->exp_bias = 0; 981 } else { 982 vc->add_bias = 0; 983 vc->exp_bias = 15<<23; 984 } 985 986 if (!headers_len) { 987 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n"); 988 return -1; 989 } 990 991 if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) { 992 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n"); 993 return -1; 994 } 995 996 init_get_bits(gb, header_start[0], header_len[0]*8); 997 hdr_type=get_bits(gb, 8); 998 if (hdr_type!=1) { 999 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n"); 1000 return -1; 1001 } 1002 if (vorbis_parse_id_hdr(vc)) { 1003 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n"); 1004 vorbis_free(vc); 1005 return -1; 1006 } 1007 1008 init_get_bits(gb, header_start[2], header_len[2]*8); 1009 hdr_type=get_bits(gb, 8); 1010 if (hdr_type!=5) { 1011 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n"); 1012 vorbis_free(vc); 1013 return -1; 1014 } 1015 if (vorbis_parse_setup_hdr(vc)) { 1016 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n"); 1017 vorbis_free(vc); 1018 return -1; 1019 } 1020 1021 avccontext->channels = vc->audio_channels; 1022 avccontext->sample_rate = vc->audio_samplerate; 1023 avccontext->frame_size = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2; 1024 avccontext->sample_fmt = SAMPLE_FMT_S16; 1025 1026 return 0 ; 1027} 1028 1029// Decode audiopackets ------------------------------------------------- 1030 1031// Read and decode floor 1032 1033static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc, 1034 vorbis_floor_data *vfu, float *vec) { 1035 vorbis_floor0 * vf=&vfu->t0; 1036 float * lsp=vf->lsp; 1037 uint_fast32_t amplitude; 1038 uint_fast32_t book_idx; 1039 uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag; 1040 1041 amplitude=get_bits(&vc->gb, vf->amplitude_bits); 1042 if (amplitude>0) { 1043 float last = 0; 1044 uint_fast16_t lsp_len = 0; 1045 uint_fast16_t idx; 1046 vorbis_codebook codebook; 1047 1048 book_idx=get_bits(&vc->gb, ilog(vf->num_books)); 1049 if ( book_idx >= vf->num_books ) { 1050 av_log( vc->avccontext, AV_LOG_ERROR, 1051 "floor0 dec: booknumber too high!\n" ); 1052 book_idx= 0; 1053 //FIXME: look above 1054 } 1055 AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx ); 1056 codebook=vc->codebooks[vf->book_list[book_idx]]; 1057 1058 while (lsp_len<vf->order) { 1059 int vec_off; 1060 1061 AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions ); 1062 AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth ); 1063 /* read temp vector */ 1064 vec_off=get_vlc2(&vc->gb, 1065 codebook.vlc.table, 1066 codebook.nb_bits, 1067 codebook.maxdepth ) * 1068 codebook.dimensions; 1069 AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off ); 1070 /* copy each vector component and add last to it */ 1071 for (idx=0; idx<codebook.dimensions; ++idx) { 1072 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last; 1073 } 1074 last=lsp[lsp_len+idx-1]; /* set last to last vector component */ 1075 1076 lsp_len += codebook.dimensions; 1077 } 1078#ifdef V_DEBUG 1079 /* DEBUG: output lsp coeffs */ 1080 { 1081 int idx; 1082 for ( idx = 0; idx < lsp_len; ++idx ) 1083 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] ); 1084 } 1085#endif 1086 1087 /* synthesize floor output vector */ 1088 { 1089 int i; 1090 int order=vf->order; 1091 float wstep=M_PI/vf->bark_map_size; 1092 1093 for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); } 1094 1095 AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n", 1096 vf->map_size, order, wstep); 1097 1098 i=0; 1099 while(i<vf->map_size[blockflag]) { 1100 int j, iter_cond=vf->map[blockflag][i]; 1101 float p=0.5f; 1102 float q=0.5f; 1103 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times 1104 1105 /* similar part for the q and p products */ 1106 for(j=0;j<order;j+=2) { 1107 q *= lsp[j] -two_cos_w; 1108 p *= lsp[j+1]-two_cos_w; 1109 } 1110 if(j==order) { // even order 1111 p *= p*(2.0f-two_cos_w); 1112 q *= q*(2.0f+two_cos_w); 1113 } 1114 else { // odd order 1115 q *= two_cos_w-lsp[j]; // one more time for q 1116 1117 /* final step and square */ 1118 p *= p*(4.f-two_cos_w*two_cos_w); 1119 q *= q; 1120 } 1121 1122 /* calculate linear floor value */ 1123 { 1124 q=exp( ( 1125 ( (amplitude*vf->amplitude_offset)/ 1126 (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) ) 1127 - vf->amplitude_offset ) * .11512925f 1128 ); 1129 } 1130 1131 /* fill vector */ 1132 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond); 1133 } 1134 } 1135 } 1136 else { 1137 /* this channel is unused */ 1138 return 1; 1139 } 1140 1141 AV_DEBUG(" Floor0 decoded\n"); 1142 1143 return 0; 1144} 1145 1146static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) { 1147 vorbis_floor1 * vf=&vfu->t1; 1148 GetBitContext *gb=&vc->gb; 1149 uint_fast16_t range_v[4]={ 256, 128, 86, 64 }; 1150 uint_fast16_t range=range_v[vf->multiplier-1]; 1151 uint_fast16_t floor1_Y[vf->x_list_dim]; 1152 uint_fast16_t floor1_Y_final[vf->x_list_dim]; 1153 int floor1_flag[vf->x_list_dim]; 1154 uint_fast8_t class_; 1155 uint_fast8_t cdim; 1156 uint_fast8_t cbits; 1157 uint_fast8_t csub; 1158 uint_fast8_t cval; 1159 int_fast16_t book; 1160 uint_fast16_t offset; 1161 uint_fast16_t i,j; 1162 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ? 1163 int_fast16_t dy, err; 1164 1165 1166 if (!get_bits1(gb)) return 1; // silence 1167 1168// Read values (or differences) for the floor's points 1169 1170 floor1_Y[0]=get_bits(gb, ilog(range-1)); 1171 floor1_Y[1]=get_bits(gb, ilog(range-1)); 1172 1173 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]); 1174 1175 offset=2; 1176 for(i=0;i<vf->partitions;++i) { 1177 class_=vf->partition_class[i]; 1178 cdim=vf->class_dimensions[class_]; 1179 cbits=vf->class_subclasses[class_]; 1180 csub=(1<<cbits)-1; 1181 cval=0; 1182 1183 AV_DEBUG("Cbits %d \n", cbits); 1184 1185 if (cbits) { // this reads all subclasses for this partition's class 1186 cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table, 1187 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3); 1188 } 1189 1190 for(j=0;j<cdim;++j) { 1191 book=vf->subclass_books[class_][cval & csub]; 1192 1193 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb)); 1194 1195 cval=cval>>cbits; 1196 if (book>-1) { 1197 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table, 1198 vc->codebooks[book].nb_bits, 3); 1199 } else { 1200 floor1_Y[offset+j]=0; 1201 } 1202 1203 AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]); 1204 } 1205 offset+=cdim; 1206 } 1207 1208// Amplitude calculation from the differences 1209 1210 floor1_flag[0]=1; 1211 floor1_flag[1]=1; 1212 floor1_Y_final[0]=floor1_Y[0]; 1213 floor1_Y_final[1]=floor1_Y[1]; 1214 1215 for(i=2;i<vf->x_list_dim;++i) { 1216 uint_fast16_t val, highroom, lowroom, room; 1217 uint_fast16_t high_neigh_offs; 1218 uint_fast16_t low_neigh_offs; 1219 1220 low_neigh_offs=vf->list[i].low; 1221 high_neigh_offs=vf->list[i].high; 1222 dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin 1223 adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x; 1224 ady= FFABS(dy); 1225 err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x); 1226 off=(int16_t)err/(int16_t)adx; 1227 if (dy<0) { 1228 predicted=floor1_Y_final[low_neigh_offs]-off; 1229 } else { 1230 predicted=floor1_Y_final[low_neigh_offs]+off; 1231 } // render_point end 1232 1233 val=floor1_Y[i]; 1234 highroom=range-predicted; 1235 lowroom=predicted; 1236 if (highroom < lowroom) { 1237 room=highroom*2; 1238 } else { 1239 room=lowroom*2; // SPEC mispelling 1240 } 1241 if (val) { 1242 floor1_flag[low_neigh_offs]=1; 1243 floor1_flag[high_neigh_offs]=1; 1244 floor1_flag[i]=1; 1245 if (val>=room) { 1246 if (highroom > lowroom) { 1247 floor1_Y_final[i]=val-lowroom+predicted; 1248 } else { 1249 floor1_Y_final[i]=predicted-val+highroom-1; 1250 } 1251 } else { 1252 if (val & 1) { 1253 floor1_Y_final[i]=predicted-(val+1)/2; 1254 } else { 1255 floor1_Y_final[i]=predicted+val/2; 1256 } 1257 } 1258 } else { 1259 floor1_flag[i]=0; 1260 floor1_Y_final[i]=predicted; 1261 } 1262 1263 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val); 1264 } 1265 1266// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ? 1267 1268 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x); 1269 1270 AV_DEBUG(" Floor decoded\n"); 1271 1272 return 0; 1273} 1274 1275// Read and decode residue 1276 1277static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen, int vr_type) { 1278 GetBitContext *gb=&vc->gb; 1279 uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions; 1280 uint_fast16_t n_to_read=vr->end-vr->begin; 1281 uint_fast16_t ptns_to_read=n_to_read/vr->partition_size; 1282 uint_fast8_t classifs[ptns_to_read*vc->audio_channels]; 1283 uint_fast8_t pass; 1284 uint_fast8_t ch_used; 1285 uint_fast8_t i,j,l; 1286 uint_fast16_t k; 1287 1288 if (vr_type==2) { 1289 for(j=1;j<ch;++j) { 1290 do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input 1291 } 1292 if (do_not_decode[0]) return 0; 1293 ch_used=1; 1294 } else { 1295 ch_used=ch; 1296 } 1297 1298 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c); 1299 1300 for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE? 1301 uint_fast16_t voffset; 1302 uint_fast16_t partition_count; 1303 uint_fast16_t j_times_ptns_to_read; 1304 1305 voffset=vr->begin; 1306 for(partition_count=0;partition_count<ptns_to_read;) { // SPEC error 1307 if (!pass) { 1308 uint_fast32_t inverse_class = ff_inverse[vr->classifications]; 1309 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) { 1310 if (!do_not_decode[j]) { 1311 uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table, 1312 vc->codebooks[vr->classbook].nb_bits, 3); 1313 1314 AV_DEBUG("Classword: %d \n", temp); 1315 1316 assert(vr->classifications > 1 && temp<=65536); //needed for inverse[] 1317 for(i=0;i<c_p_c;++i) { 1318 uint_fast32_t temp2; 1319 1320 temp2=(((uint_fast64_t)temp) * inverse_class)>>32; 1321 if (partition_count+c_p_c-1-i < ptns_to_read) { 1322 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications; 1323 } 1324 temp=temp2; 1325 } 1326 } 1327 j_times_ptns_to_read+=ptns_to_read; 1328 } 1329 } 1330 for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) { 1331 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) { 1332 uint_fast16_t voffs; 1333 1334 if (!do_not_decode[j]) { 1335 uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count]; 1336 int_fast16_t vqbook=vr->books[vqclass][pass]; 1337 1338 if (vqbook>=0 && vc->codebooks[vqbook].codevectors) { 1339 uint_fast16_t coffs; 1340 unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64 1341 uint_fast16_t step= dim==1 ? vr->partition_size 1342 : FASTDIV(vr->partition_size, dim); 1343 vorbis_codebook codebook= vc->codebooks[vqbook]; 1344 1345 if (vr_type==0) { 1346 1347 voffs=voffset+j*vlen; 1348 for(k=0;k<step;++k) { 1349 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; 1350 for(l=0;l<dim;++l) { 1351 vec[voffs+k+l*step]+=codebook.codevectors[coffs+l]; // FPMATH 1352 } 1353 } 1354 } 1355 else if (vr_type==1) { 1356 voffs=voffset+j*vlen; 1357 for(k=0;k<step;++k) { 1358 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; 1359 for(l=0;l<dim;++l, ++voffs) { 1360 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH 1361 1362 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs); 1363 } 1364 } 1365 } 1366 else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized 1367 voffs=voffset>>1; 1368 1369 if(dim==2) { 1370 for(k=0;k<step;++k) { 1371 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2; 1372 vec[voffs+k ]+=codebook.codevectors[coffs ]; // FPMATH 1373 vec[voffs+k+vlen]+=codebook.codevectors[coffs+1]; // FPMATH 1374 } 1375 } else if(dim==4) { 1376 for(k=0;k<step;++k, voffs+=2) { 1377 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4; 1378 vec[voffs ]+=codebook.codevectors[coffs ]; // FPMATH 1379 vec[voffs+1 ]+=codebook.codevectors[coffs+2]; // FPMATH 1380 vec[voffs+vlen ]+=codebook.codevectors[coffs+1]; // FPMATH 1381 vec[voffs+vlen+1]+=codebook.codevectors[coffs+3]; // FPMATH 1382 } 1383 } else 1384 for(k=0;k<step;++k) { 1385 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; 1386 for(l=0;l<dim;l+=2, voffs++) { 1387 vec[voffs ]+=codebook.codevectors[coffs+l ]; // FPMATH 1388 vec[voffs+vlen]+=codebook.codevectors[coffs+l+1]; // FPMATH 1389 1390 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l); 1391 } 1392 } 1393 1394 } 1395 else if (vr_type==2) { 1396 voffs=voffset; 1397 1398 for(k=0;k<step;++k) { 1399 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; 1400 for(l=0;l<dim;++l, ++voffs) { 1401 vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l]; // FPMATH FIXME use if and counter instead of / and % 1402 1403 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l); 1404 } 1405 } 1406 } 1407 } 1408 } 1409 j_times_ptns_to_read+=ptns_to_read; 1410 } 1411 ++partition_count; 1412 voffset+=vr->partition_size; 1413 } 1414 } 1415 } 1416 return 0; 1417} 1418 1419static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) 1420{ 1421 if (vr->type==2) 1422 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2); 1423 else if (vr->type==1) 1424 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1); 1425 else if (vr->type==0) 1426 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0); 1427 else { 1428 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n"); 1429 return 1; 1430 } 1431} 1432 1433void vorbis_inverse_coupling(float *mag, float *ang, int blocksize) 1434{ 1435 int i; 1436 for(i=0; i<blocksize; i++) 1437 { 1438 if (mag[i]>0.0) { 1439 if (ang[i]>0.0) { 1440 ang[i]=mag[i]-ang[i]; 1441 } else { 1442 float temp=ang[i]; 1443 ang[i]=mag[i]; 1444 mag[i]+=temp; 1445 } 1446 } else { 1447 if (ang[i]>0.0) { 1448 ang[i]+=mag[i]; 1449 } else { 1450 float temp=ang[i]; 1451 ang[i]=mag[i]; 1452 mag[i]-=temp; 1453 } 1454 } 1455 } 1456} 1457 1458static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias) 1459{ 1460 int i; 1461 if(exp_bias) { 1462 for(i=0; i<len; i++) 1463 ((uint32_t*)dst)[i] = ((uint32_t*)src)[i] + exp_bias; // dst[k]=src[i]*(1<<bias) 1464 } else { 1465 for(i=0; i<len; i++) 1466 dst[i] = src[i] + add_bias; 1467 } 1468} 1469 1470// Decode the audio packet using the functions above 1471 1472static int vorbis_parse_audio_packet(vorbis_context *vc) { 1473 GetBitContext *gb=&vc->gb; 1474 1475 uint_fast8_t previous_window=vc->previous_window; 1476 uint_fast8_t mode_number; 1477 uint_fast8_t blockflag; 1478 uint_fast16_t blocksize; 1479 int_fast32_t i,j; 1480 uint_fast8_t no_residue[vc->audio_channels]; 1481 uint_fast8_t do_not_decode[vc->audio_channels]; 1482 vorbis_mapping *mapping; 1483 float *ch_res_ptr=vc->channel_residues; 1484 float *ch_floor_ptr=vc->channel_floors; 1485 uint_fast8_t res_chan[vc->audio_channels]; 1486 uint_fast8_t res_num=0; 1487 int_fast16_t retlen=0; 1488 float fadd_bias = vc->add_bias; 1489 1490 if (get_bits1(gb)) { 1491 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n"); 1492 return -1; // packet type not audio 1493 } 1494 1495 if (vc->mode_count==1) { 1496 mode_number=0; 1497 } else { 1498 mode_number=get_bits(gb, ilog(vc->mode_count-1)); 1499 } 1500 if (mode_number>=vc->mode_count) { 1501 av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number); 1502 return -1; 1503 } 1504 vc->mode_number=mode_number; 1505 mapping=&vc->mappings[vc->modes[mode_number].mapping]; 1506 1507 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag); 1508 1509 blockflag=vc->modes[mode_number].blockflag; 1510 blocksize=vc->blocksize[blockflag]; 1511 if (blockflag) { 1512 skip_bits(gb, 2); // previous_window, next_window 1513 } 1514 1515 memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ? 1516 memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ? 1517 1518// Decode floor 1519 1520 for(i=0;i<vc->audio_channels;++i) { 1521 vorbis_floor *floor; 1522 if (mapping->submaps>1) { 1523 floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]]; 1524 } else { 1525 floor=&vc->floors[mapping->submap_floor[0]]; 1526 } 1527 1528 no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr); 1529 ch_floor_ptr+=blocksize/2; 1530 } 1531 1532// Nonzero vector propagate 1533 1534 for(i=mapping->coupling_steps-1;i>=0;--i) { 1535 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) { 1536 no_residue[mapping->magnitude[i]]=0; 1537 no_residue[mapping->angle[i]]=0; 1538 } 1539 } 1540 1541// Decode residue 1542 1543 for(i=0;i<mapping->submaps;++i) { 1544 vorbis_residue *residue; 1545 uint_fast8_t ch=0; 1546 1547 for(j=0;j<vc->audio_channels;++j) { 1548 if ((mapping->submaps==1) || (i==mapping->mux[j])) { 1549 res_chan[j]=res_num; 1550 if (no_residue[j]) { 1551 do_not_decode[ch]=1; 1552 } else { 1553 do_not_decode[ch]=0; 1554 } 1555 ++ch; 1556 ++res_num; 1557 } 1558 } 1559 residue=&vc->residues[mapping->submap_residue[i]]; 1560 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2); 1561 1562 ch_res_ptr+=ch*blocksize/2; 1563 } 1564 1565// Inverse coupling 1566 1567 for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed 1568 float *mag, *ang; 1569 1570 mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2; 1571 ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2; 1572 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2); 1573 } 1574 1575// Dotproduct, MDCT 1576 1577 for(j=vc->audio_channels-1;j>=0;j--) { 1578 ch_floor_ptr=vc->channel_floors+j*blocksize/2; 1579 ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2; 1580 vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2); 1581 ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr); 1582 } 1583 1584// Overlap/add, save data for next overlapping FPMATH 1585 1586 retlen = (blocksize + vc->blocksize[previous_window])/4; 1587 for(j=0;j<vc->audio_channels;j++) { 1588 uint_fast16_t bs0=vc->blocksize[0]; 1589 uint_fast16_t bs1=vc->blocksize[1]; 1590 float *residue=vc->channel_residues+res_chan[j]*blocksize/2; 1591 float *saved=vc->saved+j*bs1/4; 1592 float *ret=vc->channel_floors+j*retlen; 1593 float *buf=residue; 1594 const float *win=vc->win[blockflag&previous_window]; 1595 1596 if(blockflag == previous_window) { 1597 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4); 1598 } else if(blockflag > previous_window) { 1599 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4); 1600 copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias); 1601 } else { 1602 copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias); 1603 vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4); 1604 } 1605 memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float)); 1606 } 1607 1608 vc->previous_window = blockflag; 1609 return retlen; 1610} 1611 1612// Return the decoded audio packet through the standard api 1613 1614static int vorbis_decode_frame(AVCodecContext *avccontext, 1615 void *data, int *data_size, 1616 const uint8_t *buf, int buf_size) 1617{ 1618 vorbis_context *vc = avccontext->priv_data ; 1619 GetBitContext *gb = &(vc->gb); 1620 const float *channel_ptrs[vc->audio_channels]; 1621 int i; 1622 1623 int_fast16_t len; 1624 1625 if(!buf_size){ 1626 return 0; 1627 } 1628 1629 AV_DEBUG("packet length %d \n", buf_size); 1630 1631 init_get_bits(gb, buf, buf_size*8); 1632 1633 len=vorbis_parse_audio_packet(vc); 1634 1635 if (len<=0) { 1636 *data_size=0; 1637 return buf_size; 1638 } 1639 1640 if (!vc->first_frame) { 1641 vc->first_frame=1; 1642 *data_size=0; 1643 return buf_size ; 1644 } 1645 1646 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len); 1647 1648 for(i=0; i<vc->audio_channels; i++) 1649 channel_ptrs[i] = vc->channel_floors+i*len; 1650 vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels); 1651 *data_size=len*2*vc->audio_channels; 1652 1653 return buf_size ; 1654} 1655 1656// Close decoder 1657 1658static av_cold int vorbis_decode_close(AVCodecContext *avccontext) { 1659 vorbis_context *vc = avccontext->priv_data; 1660 1661 vorbis_free(vc); 1662 1663 return 0 ; 1664} 1665 1666AVCodec vorbis_decoder = { 1667 "vorbis", 1668 CODEC_TYPE_AUDIO, 1669 CODEC_ID_VORBIS, 1670 sizeof(vorbis_context), 1671 vorbis_decode_init, 1672 NULL, 1673 vorbis_decode_close, 1674 vorbis_decode_frame, 1675 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"), 1676}; 1677 1678