git.sesse.net Git - ffmpeg/blob - libavcodec/vorbis.c

   1 /**
   2  * @file vorbis.c
   3  * Vorbis I decoder
   4  * @author Denes Balatoni  ( dbalatoni programozo hu )
   5
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #undef V_DEBUG
  23
  24 #include <math.h>
  25
  26 #define ALT_BITSTREAM_READER_LE
  27 #include "avcodec.h"
  28 #include "bitstream.h"
  29 #include "dsputil.h"
  30
  31 #include "vorbis.h"
  32
  33 #define V_NB_BITS 11
  34 #define V_MAX_VLCS (1<<16)
  35
  36 #ifndef V_DEBUG
  37 #define AV_DEBUG(...)
  38 #endif
  39
  40
  41
  42 /* Helper functions */
  43
  44 /**
  45  *  reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
  46  */
  47 unsigned int get_bits_long_le(GetBitContext *s, int n){
  48     if(n<=17) return get_bits(s, n);
  49     else{
  50         int ret= get_bits(s, 16);
  51         return ret | (get_bits(s, n-16) << 16);
  52     }
  53 }
  54
  55 #define ilog(i) av_log2(2*(i))
  56
  57 static unsigned int nth_root(unsigned int x, unsigned int n) {   // x^(1/n)
  58     unsigned int ret=0, i, j;
  59
  60     do {
  61         ++ret;
  62         for(i=0,j=ret;i<n-1;i++) j*=ret;
  63     } while (j<=x);
  64
  65     return (ret-1);
  66 }
  67
  68 static float vorbisfloat2float(uint_fast32_t val) {
  69     double mant=val&0x1fffff;
  70     long exp=(val&0x7fe00000L)>>21;
  71     if (val&0x80000000) mant=-mant;
  72     return(ldexp(mant, exp-20-768));
  73 }
  74
  75
  76 // Generate vlc codes from vorbis huffman code lengths
  77
  78 static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
  79     uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  80         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
  81
  82     uint_fast8_t i,j;
  83     uint_fast32_t code,p;
  84
  85 #ifdef V_DEBUG
  86     GetBitContext gb;
  87 #endif
  88
  89     for(p=0;(bits[p]==0) && (p<num);++p);
  90     if (p==num) {
  91 //        av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
  92         return 0;
  93     }
  94
  95     codes[p]=0;
  96     for(i=0;i<bits[p];++i) {
  97         exit_at_level[i+1]=1<<i;
  98     }
  99
 100 #ifdef V_DEBUG
 101     av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
 102     init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
 103     for(i=0;i<bits[p];++i) {
 104         av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
 105     }
 106     av_log(vc->avccontext, AV_LOG_INFO, "\n");
 107 #endif
 108
 109     ++p;
 110
 111     for(;p<num;++p) {
 112         if (bits[p]==0) continue;
 113         // find corresponding exit(node which the tree can grow further from)
 114         for(i=bits[p];i>0;--i) {
 115             if (exit_at_level[i]) break;
 116         }
 117         if (!i) return 1; // overspecified tree
 118         code=exit_at_level[i];
 119         exit_at_level[i]=0;
 120         // construct code (append 0s to end) and introduce new exits
 121         for(j=i+1;j<=bits[p];++j) {
 122             exit_at_level[j]=code+(1<<(j-1));
 123         }
 124         codes[p]=code;
 125
 126 #ifdef V_DEBUG
 127         av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
 128         init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
 129         for(i=0;i<bits[p];++i) {
 130             av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
 131         }
 132         av_log(vc->avccontext, AV_LOG_INFO, "\n");
 133 #endif
 134
 135     }
 136
 137     //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
 138
 139     return 0;
 140 }
 141
 142 // Free all allocated memory -----------------------------------------
 143
 144 static void vorbis_free(vorbis_context *vc) {
 145     int_fast16_t i;
 146
 147     av_freep(&vc->channel_residues);
 148     av_freep(&vc->channel_floors);
 149     av_freep(&vc->saved);
 150     av_freep(&vc->ret);
 151     av_freep(&vc->buf);
 152     av_freep(&vc->buf_tmp);
 153
 154     av_freep(&vc->residues);
 155     av_freep(&vc->modes);
 156
 157     ff_mdct_end(&vc->mdct0);
 158     ff_mdct_end(&vc->mdct1);
 159
 160     for(i=0;i<vc->codebook_count;++i) {
 161         av_free(vc->codebooks[i].codevectors);
 162         free_vlc(&vc->codebooks[i].vlc);
 163     }
 164     av_freep(&vc->codebooks);
 165
 166     for(i=0;i<vc->floor_count;++i) {
 167         av_free(vc->floors[i].x_list);
 168         av_free(vc->floors[i].x_list_order);
 169         av_free(vc->floors[i].low_neighbour);
 170         av_free(vc->floors[i].high_neighbour);
 171     }
 172     av_freep(&vc->floors);
 173
 174     for(i=0;i<vc->mapping_count;++i) {
 175         av_free(vc->mappings[i].magnitude);
 176         av_free(vc->mappings[i].angle);
 177         av_free(vc->mappings[i].mux);
 178     }
 179     av_freep(&vc->mappings);
 180 }
 181
 182 // Parse setup header -------------------------------------------------
 183
 184 // Process codebooks part
 185
 186 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
 187     uint_fast16_t cb;
 188     uint_fast8_t *tmp_vlc_bits;
 189     uint_fast32_t *tmp_vlc_codes;
 190     GetBitContext *gb=&vc->gb;
 191
 192     vc->codebook_count=get_bits(gb,8)+1;
 193
 194     AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
 195
 196     vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
 197     tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
 198     tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
 199
 200     for(cb=0;cb<vc->codebook_count;++cb) {
 201         vorbis_codebook *codebook_setup=&vc->codebooks[cb];
 202         uint_fast8_t ordered;
 203         uint_fast32_t t, used_entries=0;
 204         uint_fast32_t entries;
 205
 206         AV_DEBUG(" %d. Codebook \n", cb);
 207
 208         if (get_bits(gb, 24)!=0x564342) {
 209             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook setup data corrupt. \n", cb);
 210             goto error;
 211         }
 212
 213         codebook_setup->dimensions=get_bits(gb, 16);
 214         if (codebook_setup->dimensions>16) {
 215             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
 216             goto error;
 217         }
 218         entries=get_bits(gb, 24);
 219         if (entries>V_MAX_VLCS) {
 220             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook has too many entries (%d). \n", cb, entries);
 221             goto error;
 222         }
 223
 224         ordered=get_bits1(gb);
 225
 226         AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
 227
 228         if (!ordered) {
 229             uint_fast16_t ce;
 230             uint_fast8_t flag;
 231             uint_fast8_t sparse=get_bits1(gb);
 232
 233             AV_DEBUG(" not ordered \n");
 234
 235             if (sparse) {
 236                 AV_DEBUG(" sparse \n");
 237
 238                 used_entries=0;
 239                 for(ce=0;ce<entries;++ce) {
 240                     flag=get_bits1(gb);
 241                     if (flag) {
 242                         tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
 243                         ++used_entries;
 244                     }
 245                     else tmp_vlc_bits[ce]=0;
 246                 }
 247             } else {
 248                 AV_DEBUG(" not sparse \n");
 249
 250                 used_entries=entries;
 251                 for(ce=0;ce<entries;++ce) {
 252                     tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
 253                 }
 254             }
 255         } else {
 256             uint_fast16_t current_entry=0;
 257             uint_fast8_t current_length=get_bits(gb, 5)+1;
 258
 259             AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
 260
 261             used_entries=entries;
 262             for(;current_entry<used_entries;++current_length) {
 263                 uint_fast16_t i, number;
 264
 265                 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
 266
 267                 number=get_bits(gb, ilog(entries - current_entry));
 268
 269                 AV_DEBUG(" number: %d \n", number);
 270
 271                 for(i=current_entry;i<number+current_entry;++i) {
 272                     if (i<used_entries) tmp_vlc_bits[i]=current_length;
 273                 }
 274
 275                 current_entry+=number;
 276             }
 277             if (current_entry>used_entries) {
 278                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
 279                 goto error;
 280             }
 281         }
 282
 283         codebook_setup->lookup_type=get_bits(gb, 4);
 284
 285         AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
 286
 287 // If the codebook is used for (inverse) VQ, calculate codevectors.
 288
 289         if (codebook_setup->lookup_type==1) {
 290             uint_fast16_t i, j, k;
 291             uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
 292             uint_fast16_t codebook_multiplicands[codebook_lookup_values];
 293
 294             float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
 295             float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
 296             uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
 297             uint_fast8_t codebook_sequence_p=get_bits1(gb);
 298
 299             AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
 300             AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
 301
 302             for(i=0;i<codebook_lookup_values;++i) {
 303                 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
 304
 305                 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
 306                 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
 307             }
 308
 309 // Weed out unused vlcs and build codevector vector
 310             codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
 311             for(j=0, i=0;i<entries;++i) {
 312                 uint_fast8_t dim=codebook_setup->dimensions;
 313
 314                 if (tmp_vlc_bits[i]) {
 315                     float last=0.0;
 316                     uint_fast32_t lookup_offset=i;
 317
 318 #ifdef V_DEBUG
 319                     av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
 320 #endif
 321
 322                     for(k=0;k<dim;++k) {
 323                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
 324                         codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
 325                         if (codebook_sequence_p) {
 326                             last=codebook_setup->codevectors[j*dim+k];
 327                         }
 328                         lookup_offset/=codebook_lookup_values;
 329                     }
 330                     tmp_vlc_bits[j]=tmp_vlc_bits[i];
 331
 332 #ifdef V_DEBUG
 333                     av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
 334                     for(k=0;k<dim;++k) {
 335                         av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
 336                     }
 337                     av_log(vc->avccontext, AV_LOG_INFO, "\n");
 338 #endif
 339
 340                     ++j;
 341                 }
 342             }
 343             if (j!=used_entries) {
 344                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
 345                 goto error;
 346             }
 347             entries=used_entries;
 348         }
 349         else if (codebook_setup->lookup_type>=2) {
 350             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
 351             goto error;
 352         }
 353
 354 // Initialize VLC table
 355         if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
 356             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
 357             goto error;
 358         }
 359         codebook_setup->maxdepth=0;
 360         for(t=0;t<entries;++t)
 361             if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
 362
 363         codebook_setup->maxdepth=(codebook_setup->maxdepth+V_NB_BITS-1)/V_NB_BITS;
 364
 365         if (init_vlc(&codebook_setup->vlc, V_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)) {
 366             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
 367             goto error;
 368         }
 369     }
 370
 371     av_free(tmp_vlc_bits);
 372     av_free(tmp_vlc_codes);
 373     return 0;
 374
 375 // Error:
 376 error:
 377     av_free(tmp_vlc_bits);
 378     av_free(tmp_vlc_codes);
 379     return 1;
 380 }
 381
 382 // Process time domain transforms part (unused in Vorbis I)
 383
 384 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
 385     GetBitContext *gb=&vc->gb;
 386     uint_fast8_t i;
 387     uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
 388
 389     for(i=0;i<vorbis_time_count;++i) {
 390         uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
 391
 392         AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
 393
 394         if (vorbis_tdtransform) {
 395             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
 396             return 1;
 397         }
 398     }
 399     return 0;
 400 }
 401
 402 // Process floors part - only floor type 1 is supported
 403
 404 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
 405     GetBitContext *gb=&vc->gb;
 406     uint_fast16_t i,j,k;
 407
 408     vc->floor_count=get_bits(gb, 6)+1;
 409
 410     vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
 411
 412     for (i=0;i<vc->floor_count;++i) {
 413         vorbis_floor *floor_setup=&vc->floors[i];
 414
 415         floor_setup->floor_type=get_bits(gb, 16);
 416
 417         AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
 418
 419         if (floor_setup->floor_type==1) {
 420             uint_fast8_t maximum_class=0;
 421             uint_fast8_t rangebits;
 422             uint_fast16_t floor1_values=2;
 423
 424             floor_setup->partitions=get_bits(gb, 5);
 425
 426             AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions);
 427
 428             for(j=0;j<floor_setup->partitions;++j) {
 429                 floor_setup->partition_class[j]=get_bits(gb, 4);
 430                 if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];
 431
 432                 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]);
 433
 434             }
 435
 436             AV_DEBUG(" maximum class %d \n", maximum_class);
 437
 438             floor_setup->maximum_class=maximum_class;
 439
 440             for(j=0;j<=maximum_class;++j) {
 441                 floor_setup->class_dimensions[j]=get_bits(gb, 3)+1;
 442                 floor_setup->class_subclasses[j]=get_bits(gb, 2);
 443
 444                 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);
 445
 446                 if (floor_setup->class_subclasses[j]) {
 447                     floor_setup->class_masterbook[j]=get_bits(gb, 8);
 448
 449                     AV_DEBUG("   masterbook: %d \n", floor_setup->class_masterbook[j]);
 450                 }
 451
 452                 for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) {
 453                     floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1;
 454
 455                     AV_DEBUG("    book %d. : %d \n", k, floor_setup->subclass_books[j][k]);
 456                 }
 457             }
 458
 459             floor_setup->multiplier=get_bits(gb, 2)+1;
 460             floor_setup->x_list_dim=2;
 461
 462             for(j=0;j<floor_setup->partitions;++j) {
 463                 floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]];
 464             }
 465
 466             floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
 467             floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
 468             floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
 469             floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
 470
 471
 472             rangebits=get_bits(gb, 4);
 473             floor_setup->x_list[0] = 0;
 474             floor_setup->x_list[1] = (1<<rangebits);
 475
 476             for(j=0;j<floor_setup->partitions;++j) {
 477                 for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) {
 478                     floor_setup->x_list[floor1_values]=get_bits(gb, rangebits);
 479
 480                     AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]);
 481                 }
 482             }
 483
 484 // Precalculate order of x coordinates - needed for decode
 485
 486             for(k=0;k<floor_setup->x_list_dim;++k) {
 487                 floor_setup->x_list_order[k]=k;
 488             }
 489
 490             for(k=0;k<floor_setup->x_list_dim-1;++k) {   // FIXME optimize sorting ?
 491                 for(j=k+1;j<floor_setup->x_list_dim;++j) {
 492                     if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {
 493                         uint_fast16_t tmp=floor_setup->x_list_order[k];
 494                         floor_setup->x_list_order[k]=floor_setup->x_list_order[j];
 495                         floor_setup->x_list_order[j]=tmp;
 496                     }
 497                 }
 498             }
 499
 500 // Precalculate low and high neighbours
 501
 502             for(k=2;k<floor_setup->x_list_dim;++k) {
 503                 floor_setup->low_neighbour[k]=0;
 504                 floor_setup->high_neighbour[k]=1;  // correct according to SPEC requirements
 505
 506                 for (j=0;j<k;++j) {
 507                     if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&
 508                       (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) {
 509                         floor_setup->low_neighbour[k]=j;
 510                     }
 511                     if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&
 512                       (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) {
 513                         floor_setup->high_neighbour[k]=j;
 514                     }
 515                 }
 516             }
 517         }
 518         else {
 519             av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");
 520             return 1;
 521         }
 522     }
 523     return 0;
 524 }
 525
 526 // Process residues part
 527
 528 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
 529     GetBitContext *gb=&vc->gb;
 530     uint_fast8_t i, j, k;
 531
 532     vc->residue_count=get_bits(gb, 6)+1;
 533     vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
 534
 535     AV_DEBUG(" There are %d residues. \n", vc->residue_count);
 536
 537     for(i=0;i<vc->residue_count;++i) {
 538         vorbis_residue *res_setup=&vc->residues[i];
 539         uint_fast8_t cascade[64];
 540         uint_fast8_t high_bits;
 541         uint_fast8_t low_bits;
 542
 543         res_setup->type=get_bits(gb, 16);
 544
 545         AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
 546
 547         res_setup->begin=get_bits(gb, 24);
 548         res_setup->end=get_bits(gb, 24);
 549         res_setup->partition_size=get_bits(gb, 24)+1;
 550         res_setup->classifications=get_bits(gb, 6)+1;
 551         res_setup->classbook=get_bits(gb, 8);
 552
 553         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,
 554           res_setup->classifications, res_setup->classbook);
 555
 556         for(j=0;j<res_setup->classifications;++j) {
 557             high_bits=0;
 558             low_bits=get_bits(gb, 3);
 559             if (get_bits1(gb)) {
 560                 high_bits=get_bits(gb, 5);
 561             }
 562             cascade[j]=(high_bits<<3)+low_bits;
 563
 564             AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
 565         }
 566
 567         res_setup->maxpass=0;
 568         for(j=0;j<res_setup->classifications;++j) {
 569             for(k=0;k<8;++k) {
 570                 if (cascade[j]&(1<<k)) {
 571                         res_setup->books[j][k]=get_bits(gb, 8);
 572
 573                     AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
 574
 575                     if (k>res_setup->maxpass) {
 576                         res_setup->maxpass=k;
 577                     }
 578                 } else {
 579                     res_setup->books[j][k]=-1;
 580                 }
 581             }
 582         }
 583     }
 584     return 0;
 585 }
 586
 587 // Process mappings part
 588
 589 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
 590     GetBitContext *gb=&vc->gb;
 591     uint_fast8_t i, j;
 592
 593     vc->mapping_count=get_bits(gb, 6)+1;
 594     vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
 595
 596     AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
 597
 598     for(i=0;i<vc->mapping_count;++i) {
 599         vorbis_mapping *mapping_setup=&vc->mappings[i];
 600
 601         if (get_bits(gb, 16)) {
 602             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
 603             return 1;
 604         }
 605         if (get_bits1(gb)) {
 606             mapping_setup->submaps=get_bits(gb, 4)+1;
 607         } else {
 608             mapping_setup->submaps=1;
 609         }
 610
 611         if (get_bits1(gb)) {
 612             mapping_setup->coupling_steps=get_bits(gb, 8)+1;
 613             mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
 614             mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
 615             for(j=0;j<mapping_setup->coupling_steps;++j) {
 616                 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
 617                 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
 618                 // FIXME: sanity checks
 619             }
 620         } else {
 621             mapping_setup->coupling_steps=0;
 622         }
 623
 624         AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
 625
 626         if(get_bits(gb, 2)) {
 627             av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
 628             return 1; // following spec.
 629         }
 630
 631         if (mapping_setup->submaps>1) {
 632             mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
 633             for(j=0;j<vc->audio_channels;++j) {
 634                 mapping_setup->mux[j]=get_bits(gb, 4);
 635             }
 636         }
 637
 638         for(j=0;j<mapping_setup->submaps;++j) {
 639             get_bits(gb, 8); // FIXME check?
 640             mapping_setup->submap_floor[j]=get_bits(gb, 8);
 641             mapping_setup->submap_residue[j]=get_bits(gb, 8);
 642
 643             AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
 644         }
 645     }
 646     return 0;
 647 }
 648
 649 // Process modes part
 650
 651 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
 652     GetBitContext *gb=&vc->gb;
 653     uint_fast8_t i;
 654
 655     vc->mode_count=get_bits(gb, 6)+1;
 656     vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
 657
 658     AV_DEBUG(" There are %d modes.\n", vc->mode_count);
 659
 660     for(i=0;i<vc->mode_count;++i) {
 661         vorbis_mode *mode_setup=&vc->modes[i];
 662
 663         mode_setup->blockflag=get_bits(gb, 1);
 664         mode_setup->windowtype=get_bits(gb, 16); //FIXME check
 665         mode_setup->transformtype=get_bits(gb, 16); //FIXME check
 666         mode_setup->mapping=get_bits(gb, 8); //FIXME check
 667
 668         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);
 669     }
 670     return 0;
 671 }
 672
 673 // Process the whole setup header using the functions above
 674
 675 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
 676     GetBitContext *gb=&vc->gb;
 677
 678     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
 679     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
 680     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
 681         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
 682         return 1;
 683     }
 684
 685     if (vorbis_parse_setup_hdr_codebooks(vc)) {
 686         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
 687         return 2;
 688     }
 689     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
 690         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
 691         return 3;
 692     }
 693     if (vorbis_parse_setup_hdr_floors(vc)) {
 694         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
 695         return 4;
 696     }
 697     if (vorbis_parse_setup_hdr_residues(vc)) {
 698         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
 699         return 5;
 700     }
 701     if (vorbis_parse_setup_hdr_mappings(vc)) {
 702         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
 703         return 6;
 704     }
 705     if (vorbis_parse_setup_hdr_modes(vc)) {
 706         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
 707         return 7;
 708     }
 709     if (!get_bits1(gb)) {
 710         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
 711         return 8; // framing flag bit unset error
 712     }
 713
 714     return 0;
 715 }
 716
 717 // Process the identification header
 718
 719 static int vorbis_parse_id_hdr(vorbis_context *vc){
 720     GetBitContext *gb=&vc->gb;
 721     uint_fast8_t bl0, bl1;
 722     const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
 723
 724     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
 725     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
 726     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
 727         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
 728         return 1;
 729     }
 730
 731     vc->version=get_bits_long_le(gb, 32);    //FIXME check 0
 732     vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
 733     vc->audio_samplerate=get_bits_long_le(gb, 32);   //FIXME check >0
 734     vc->bitrate_maximum=get_bits_long_le(gb, 32);
 735     vc->bitrate_nominal=get_bits_long_le(gb, 32);
 736     vc->bitrate_minimum=get_bits_long_le(gb, 32);
 737     bl0=get_bits(gb, 4);
 738     bl1=get_bits(gb, 4);
 739     vc->blocksize_0=(1<<bl0);
 740     vc->blocksize_1=(1<<bl1);
 741     if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
 742         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
 743         return 3;
 744     }
 745     vc->swin=vwin[bl0-6];
 746     vc->lwin=vwin[bl1-6];
 747
 748     if ((get_bits1(gb)) == 0) {
 749         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
 750         return 2;
 751     }
 752
 753     vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
 754     vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
 755     vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
 756     vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
 757     vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
 758     vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
 759     vc->saved_start=0;
 760
 761     ff_mdct_init(&vc->mdct0, bl0, 1);
 762     ff_mdct_init(&vc->mdct1, bl1, 1);
 763
 764     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 ",
 765             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
 766
 767 /*
 768     BLK=vc->blocksize_0;
 769     for(i=0;i<BLK/2;++i) {
 770         vc->swin[i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
 771     }
 772 */
 773
 774     return 0;
 775 }
 776
 777 // Process the extradata using the functions above (identification header, setup header)
 778
 779 static int vorbis_decode_init(AVCodecContext *avccontext) {
 780     vorbis_context *vc = avccontext->priv_data ;
 781     uint8_t *headers = avccontext->extradata;
 782     int headers_len=avccontext->extradata_size;
 783     uint8_t *header_start[3];
 784     int header_len[3];
 785     GetBitContext *gb = &(vc->gb);
 786     int i, j, hdr_type;
 787
 788     vc->avccontext = avccontext;
 789
 790     if (!headers_len) {
 791         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 792         return -1;
 793     }
 794
 795     if(headers[0] == 0 && headers[1] == 30) {
 796         for(i = 0; i < 3; i++){
 797             header_len[i] = *headers++ << 8;
 798             header_len[i] += *headers++;
 799             header_start[i] = headers;
 800             headers += header_len[i];
 801         }
 802     } else if(headers[0] == 2) {
 803         for(j=1,i=0;i<2;++i, ++j) {
 804             header_len[i]=0;
 805             while(j<headers_len && headers[j]==0xff) {
 806                 header_len[i]+=0xff;
 807                 ++j;
 808             }
 809             if (j>=headers_len) {
 810                 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 811                 return -1;
 812             }
 813             header_len[i]+=headers[j];
 814         }
 815         header_len[2]=headers_len-header_len[0]-header_len[1]-j;
 816         headers+=j;
 817         header_start[0] = headers;
 818         header_start[1] = header_start[0] + header_len[0];
 819         header_start[2] = header_start[1] + header_len[1];
 820     } else {
 821         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 822         return -1;
 823     }
 824
 825     init_get_bits(gb, header_start[0], header_len[0]*8);
 826     hdr_type=get_bits(gb, 8);
 827     if (hdr_type!=1) {
 828         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
 829         return -1;
 830     }
 831     if (vorbis_parse_id_hdr(vc)) {
 832         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
 833         vorbis_free(vc);
 834         return -1;
 835     }
 836
 837     init_get_bits(gb, header_start[2], header_len[2]*8);
 838     hdr_type=get_bits(gb, 8);
 839     if (hdr_type!=5) {
 840         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
 841         return -1;
 842     }
 843     if (vorbis_parse_setup_hdr(vc)) {
 844         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
 845         vorbis_free(vc);
 846         return -1;
 847     }
 848
 849     avccontext->channels = vc->audio_channels;
 850     avccontext->sample_rate = vc->audio_samplerate;
 851
 852     return 0 ;
 853 }
 854
 855 // Decode audiopackets -------------------------------------------------
 856
 857 // Read and decode floor (type 1 only)
 858
 859 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {
 860     GetBitContext *gb=&vc->gb;
 861     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
 862     uint_fast16_t range=range_v[vf->multiplier-1];
 863     uint_fast16_t floor1_Y[vf->x_list_dim];
 864     uint_fast16_t floor1_Y_final[vf->x_list_dim];
 865     uint_fast8_t floor1_flag[vf->x_list_dim];
 866     uint_fast8_t class_;
 867     uint_fast8_t cdim;
 868     uint_fast8_t cbits;
 869     uint_fast8_t csub;
 870     uint_fast8_t cval;
 871     int_fast16_t book;
 872     uint_fast16_t offset;
 873     uint_fast16_t i,j;
 874     uint_fast16_t *floor_x_sort=vf->x_list_order;
 875     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
 876     int_fast16_t dy, err;
 877     uint_fast16_t lx,hx, ly, hy=0;
 878
 879
 880     if (!get_bits1(gb)) return 1; // silence
 881
 882 // Read values (or differences) for the floor's points
 883
 884     floor1_Y[0]=get_bits(gb, ilog(range-1));
 885     floor1_Y[1]=get_bits(gb, ilog(range-1));
 886
 887     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
 888
 889     offset=2;
 890     for(i=0;i<vf->partitions;++i) {
 891         class_=vf->partition_class[i];
 892         cdim=vf->class_dimensions[class_];
 893         cbits=vf->class_subclasses[class_];
 894         csub=(1<<cbits)-1;
 895         cval=0;
 896
 897         AV_DEBUG("Cbits %d \n", cbits);
 898
 899         if (cbits) { // this reads all subclasses for this partition's class
 900             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
 901             V_NB_BITS, vc->codebooks[vf->class_masterbook[class_]].maxdepth);
 902         }
 903
 904         for(j=0;j<cdim;++j) {
 905             book=vf->subclass_books[class_][cval & csub];
 906
 907             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
 908
 909             cval=cval>>cbits;
 910             if (book>0) {
 911                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
 912                 V_NB_BITS, vc->codebooks[book].maxdepth);
 913             } else {
 914                 floor1_Y[offset+j]=0;
 915             }
 916
 917             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
 918         }
 919         offset+=cdim;
 920     }
 921
 922 // Amplitude calculation from the differences
 923
 924     floor1_flag[0]=1;
 925     floor1_flag[1]=1;
 926     floor1_Y_final[0]=floor1_Y[0];
 927     floor1_Y_final[1]=floor1_Y[1];
 928
 929     for(i=2;i<vf->x_list_dim;++i) {
 930         uint_fast16_t val, highroom, lowroom, room;
 931         uint_fast16_t high_neigh_offs;
 932         uint_fast16_t low_neigh_offs;
 933
 934         low_neigh_offs=vf->low_neighbour[i];
 935         high_neigh_offs=vf->high_neighbour[i];
 936         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
 937         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
 938         ady= ABS(dy);
 939         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
 940         off=err/adx;
 941         if (dy<0) {
 942             predicted=floor1_Y_final[low_neigh_offs]-off;
 943         } else {
 944             predicted=floor1_Y_final[low_neigh_offs]+off;
 945         } // render_point end
 946
 947         val=floor1_Y[i];
 948         highroom=range-predicted;
 949         lowroom=predicted;
 950         if (highroom < lowroom) {
 951             room=highroom*2;
 952         } else {
 953             room=lowroom*2;   // SPEC mispelling
 954         }
 955         if (val) {
 956             floor1_flag[low_neigh_offs]=1;
 957             floor1_flag[high_neigh_offs]=1;
 958             floor1_flag[i]=1;
 959             if (val>=room) {
 960                 if (highroom > lowroom) {
 961                     floor1_Y_final[i]=val-lowroom+predicted;
 962                 } else {
 963                     floor1_Y_final[i]=predicted-val+highroom-1;
 964                 }
 965             } else {
 966                 if (val & 1) {
 967                     floor1_Y_final[i]=predicted-(val+1)/2;
 968                 } else {
 969                     floor1_Y_final[i]=predicted+val/2;
 970                 }
 971             }
 972         } else {
 973             floor1_flag[i]=0;
 974             floor1_Y_final[i]=predicted;
 975         }
 976
 977         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
 978     }
 979
 980 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
 981
 982     hx=0;
 983     lx=0;
 984     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
 985
 986     vec[0]=floor1_inverse_db_table[ly];
 987
 988     for(i=1;i<vf->x_list_dim;++i) {
 989         AV_DEBUG(" Looking at post %d \n", i);
 990
 991         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
 992             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
 993
 994             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
 995             hx=vf->x_list[floor_x_sort[i]];
 996
 997             dy=hy-ly;
 998             adx=hx-lx;
 999             ady= (dy<0) ? -dy:dy;//ABS(dy);
1000             base=dy/adx;
1001
1002             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1003
1004             x=lx;
1005             y=ly;
1006             err=0;
1007             if (dy<0) {
1008                 sy=base-1;
1009             } else {
1010                 sy=base+1;
1011             }
1012             ady=ady-(base<0 ? -base : base)*adx;
1013             vec[x]=floor1_inverse_db_table[y];
1014
1015             AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1016
1017             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1018                 err+=ady;
1019                 if (err>=adx) {
1020                     err-=adx;
1021                     y+=sy;
1022                 } else {
1023                     y+=base;
1024                 }
1025                 vec[x]=floor1_inverse_db_table[y];
1026
1027                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1028             }
1029
1030 /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1031                 dy=hy-ly;
1032                 adx=hx-lx;
1033                 ady= dy<0 ? -dy : dy;
1034                 err=ady*j;
1035                 off=err/adx;
1036                 if (dy<0) {
1037                     predicted=ly-off;
1038                 } else {
1039                     predicted=ly+off;
1040                 }
1041                 if (lx+j < vf->x_list[1]) {
1042                     vec[lx+j]=floor1_inverse_db_table[predicted];
1043                 }
1044             }*/
1045
1046             lx=hx;
1047             ly=hy;
1048         }
1049     }
1050
1051     if (hx<vf->x_list[1]) {
1052         for(i=hx;i<vf->x_list[1];++i) {
1053             vec[i]=floor1_inverse_db_table[hy];
1054         }
1055     }
1056
1057     AV_DEBUG(" Floor decoded\n");
1058
1059     return 0;
1060 }
1061
1062 // Read and decode residue
1063
1064 static 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) {
1065     GetBitContext *gb=&vc->gb;
1066     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1067     uint_fast16_t n_to_read=vr->end-vr->begin;
1068     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1069     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1070     uint_fast8_t pass;
1071     uint_fast8_t ch_used;
1072     uint_fast8_t i,j,l;
1073     uint_fast16_t k;
1074
1075     if (vr->type==2) {
1076         for(j=1;j<ch;++j) {
1077                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1078         }
1079         if (do_not_decode[0]) return 0;
1080         ch_used=1;
1081     } else {
1082         ch_used=ch;
1083     }
1084
1085     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1086
1087     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1088         uint_fast16_t voffset;
1089         uint_fast16_t partition_count;
1090         uint_fast16_t j_times_ptns_to_read;
1091
1092         voffset=vr->begin;
1093         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1094             if (!pass) {
1095                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1096                     if (!do_not_decode[j]) {
1097                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1098                         V_NB_BITS, vc->codebooks[vr->classbook].maxdepth);
1099
1100                         AV_DEBUG("Classword: %d \n", temp);
1101
1102                         for(i=0;i<c_p_c;++i) {
1103                             uint_fast32_t temp2;
1104
1105                             temp2=temp/vr->classifications;
1106                             classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1107                             temp=temp2;
1108                         }
1109                     }
1110                     j_times_ptns_to_read+=ptns_to_read;
1111                 }
1112             }
1113             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1114                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1115                     uint_fast16_t voffs;
1116
1117                     if (!do_not_decode[j]) {
1118                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1119                         int_fast16_t vqbook=vr->books[vqclass][pass];
1120
1121                         if (vqbook>=0) {
1122                             uint_fast16_t coffs;
1123
1124                             if (vr->type==0) {
1125                                 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1126
1127                                 voffs=voffset+j*vlen;
1128                                 for(k=0;k<step;++k) {
1129                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1130                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1131                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l) {
1132                                         vec[voffs+k+l*step]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1133                                     }
1134                                 }
1135                             }
1136                             else if (vr->type==1) {
1137                                 voffs=voffset+j*vlen;
1138                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1139                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1140                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1141                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1142                                         vec[voffs]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1143
1144                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], vc->codebooks[vqbook].codevectors[coffs+l], coffs);
1145                                     }
1146                                 }
1147                             }
1148                             else if (vr->type==2 && ch==2) { // most frequent case optimized
1149                                 voffs=voffset;
1150
1151                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1152                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1153                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1154                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1155                                         vec[(voffs>>1)+((voffs&1) ? vlen : 0)]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1156
1157                                         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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);
1158                                     }
1159                                 }
1160
1161                             }
1162                             else if (vr->type==2) {
1163                                 voffs=voffset;
1164
1165                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1166                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1167                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1168                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1169                                         vec[voffs/ch+(voffs%ch)*vlen]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1170
1171                                         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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);
1172                                     }
1173                                 }
1174                             } else {
1175                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1176                                 return 1;
1177                             }
1178                         }
1179                     }
1180                     j_times_ptns_to_read+=ptns_to_read;
1181                 }
1182                 ++partition_count;
1183                 voffset+=vr->partition_size;
1184             }
1185         }
1186     }
1187     return 0;
1188 }
1189
1190 // Decode the audio packet using the functions above
1191 #define BIAS 384
1192
1193 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1194     GetBitContext *gb=&vc->gb;
1195
1196     uint_fast8_t previous_window=0,next_window=0;
1197     uint_fast8_t mode_number;
1198     uint_fast16_t blocksize;
1199     int_fast32_t i,j;
1200     uint_fast8_t no_residue[vc->audio_channels];
1201     uint_fast8_t do_not_decode[vc->audio_channels];
1202     vorbis_mapping *mapping;
1203     float *ch_res_ptr=vc->channel_residues;
1204     float *ch_floor_ptr=vc->channel_floors;
1205     uint_fast8_t res_chan[vc->audio_channels];
1206     uint_fast8_t res_num=0;
1207     int_fast16_t retlen=0;
1208     uint_fast16_t saved_start=0;
1209
1210     if (get_bits1(gb)) {
1211         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1212         return -1; // packet type not audio
1213     }
1214
1215     if (vc->mode_count==1) {
1216         mode_number=0;
1217     } else {
1218         mode_number=get_bits(gb, ilog(vc->mode_count-1));
1219     }
1220     mapping=&vc->mappings[vc->modes[mode_number].mapping];
1221
1222     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1223
1224     if (vc->modes[mode_number].blockflag) {
1225         previous_window=get_bits1(gb);
1226         next_window=get_bits1(gb);
1227     }
1228
1229     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1230     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1231     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1232
1233 // Decode floor(1)
1234
1235     for(i=0;i<vc->audio_channels;++i) {
1236         vorbis_floor *floor;
1237         if (mapping->submaps>1) {
1238             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1239         } else {
1240             floor=&vc->floors[mapping->submap_floor[0]];
1241         }
1242
1243         no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);
1244         ch_floor_ptr+=blocksize/2;
1245     }
1246
1247 // Nonzero vector propagate
1248
1249     for(i=mapping->coupling_steps-1;i>=0;--i) {
1250         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1251             no_residue[mapping->magnitude[i]]=0;
1252             no_residue[mapping->angle[i]]=0;
1253         }
1254     }
1255
1256 // Decode residue
1257
1258     for(i=0;i<mapping->submaps;++i) {
1259         vorbis_residue *residue;
1260         uint_fast8_t ch=0;
1261
1262         for(j=0;j<vc->audio_channels;++j) {
1263             if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1264                 res_chan[j]=res_num;
1265                 if (no_residue[j]) {
1266                     do_not_decode[ch]=1;
1267                 } else {
1268                     do_not_decode[ch]=0;
1269                 }
1270                 ++ch;
1271                 ++res_num;
1272             }
1273         }
1274         residue=&vc->residues[mapping->submap_residue[i]];
1275         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1276
1277         ch_res_ptr+=ch*blocksize/2;
1278     }
1279
1280 // Inverse coupling
1281
1282     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1283         float *mag, *ang;
1284
1285         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1286         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1287         for(j=0;j<blocksize/2;++j) {
1288             float temp;
1289             if (mag[j]>0.0) {
1290                 if (ang[j]>0.0) {
1291                     ang[j]=mag[j]-ang[j];
1292                 } else {
1293                     temp=ang[j];
1294                     ang[j]=mag[j];
1295                     mag[j]+=temp;
1296                 }
1297             } else {
1298                 if (ang[j]>0.0) {
1299                     ang[j]+=mag[j];
1300                 } else {
1301                     temp=ang[j];
1302                     ang[j]=mag[j];
1303                     mag[j]-=temp;
1304                 }
1305             }
1306         }
1307     }
1308
1309 // Dotproduct
1310
1311     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1312         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1313
1314         for(i=0;i<blocksize/2;++i) {
1315             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1316         }
1317     }
1318
1319 // MDCT, overlap/add, save data for next overlapping  FPMATH
1320
1321     for(j=0;j<vc->audio_channels;++j) {
1322         uint_fast8_t step=vc->audio_channels;
1323         uint_fast16_t k;
1324         float *saved=vc->saved+j*vc->blocksize_1/2;
1325         float *ret=vc->ret;
1326         const float *lwin=vc->lwin;
1327         const float *swin=vc->swin;
1328         float *buf=vc->buf;
1329         float *buf_tmp=vc->buf_tmp;
1330
1331         ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1332
1333         saved_start=vc->saved_start;
1334
1335         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1336
1337         if (vc->modes[mode_number].blockflag) {
1338             // -- overlap/add
1339             if (previous_window) {
1340                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1341                     ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
1342                 }
1343                 retlen=vc->blocksize_1/2;
1344             } else {
1345                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1346                     ret[k]=saved[i]+buf[(vc->blocksize_1-vc->blocksize_0)/4+i]*swin[i]+BIAS;
1347                 }
1348                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1349                     ret[k]=buf[vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4+i]+BIAS;
1350                 }
1351                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1352             }
1353             // -- save
1354             if (next_window) {
1355                 for(i=0;i<vc->blocksize_1/2;++i) {
1356                     saved[i]=buf[vc->blocksize_1/2+i]*lwin[vc->blocksize_1/2-1-i];
1357                 }
1358                 saved_start=0;
1359             } else {
1360                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1361                 for(i=0;i<saved_start;++i) {
1362                     saved[i]=buf[vc->blocksize_1/2+i];
1363                 }
1364                 for(i=0;i<vc->blocksize_0/2;++i) {
1365                     saved[saved_start+i]=buf[vc->blocksize_1/2+saved_start+i]*swin[vc->blocksize_0/2-1-i];
1366                 }
1367             }
1368         } else {
1369             // --overlap/add
1370             for(k=j, i=0;i<saved_start;++i, k+=step) {
1371                 ret[k]=saved[i]+BIAS;
1372             }
1373             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1374                 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
1375             }
1376             retlen=saved_start+vc->blocksize_0/2;
1377             // -- save
1378             for(i=0;i<vc->blocksize_0/2;++i) {
1379                 saved[i]=buf[vc->blocksize_0/2+i]*swin[vc->blocksize_0/2-1-i];
1380             }
1381             saved_start=0;
1382         }
1383     }
1384     vc->saved_start=saved_start;
1385
1386     return retlen*vc->audio_channels;
1387 }
1388
1389 // Return the decoded audio packet through the standard api
1390
1391 static int vorbis_decode_frame(AVCodecContext *avccontext,
1392                         void *data, int *data_size,
1393                         uint8_t *buf, int buf_size)
1394 {
1395     vorbis_context *vc = avccontext->priv_data ;
1396     GetBitContext *gb = &(vc->gb);
1397
1398     int_fast16_t i, len;
1399
1400     if(!buf_size){
1401         return 0;
1402     }
1403
1404     AV_DEBUG("packet length %d \n", buf_size);
1405
1406     init_get_bits(gb, buf, buf_size*8);
1407
1408     len=vorbis_parse_audio_packet(vc);
1409
1410     if (len<=0) {
1411         *data_size=0;
1412         return buf_size;
1413     }
1414
1415     if (!vc->first_frame) {
1416         vc->first_frame=1;
1417         *data_size=0;
1418         return buf_size ;
1419     }
1420
1421     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1422
1423     for(i=0;i<len;++i) {
1424         int_fast32_t tmp= ((int32_t*)vc->ret)[i];
1425         if(tmp > 0x43c07fff)
1426             tmp= 32767;
1427         else if(tmp < 0x43bf8000)
1428             tmp= -32768;
1429         ((int16_t*)data)[i]=tmp;
1430     }
1431
1432     *data_size=len*2;
1433
1434     return buf_size ;
1435 }
1436
1437 // Close decoder
1438
1439 static int vorbis_decode_close(AVCodecContext *avccontext) {
1440     vorbis_context *vc = avccontext->priv_data;
1441
1442     vorbis_free(vc);
1443
1444     return 0 ;
1445 }
1446
1447 AVCodec vorbis_decoder = {
1448     "vorbis",
1449     CODEC_TYPE_AUDIO,
1450     CODEC_ID_VORBIS,
1451     sizeof(vorbis_context),
1452     vorbis_decode_init,
1453     NULL,
1454     vorbis_decode_close,
1455     vorbis_decode_frame,
1456 };
1457