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 static unsigned int ilog(unsigned int i) { // unfortunatelly av_log2 uses different rounding
  56     unsigned int ret=0;
  57     while (i!=0) {
  58         ++ret;
  59         i>>=1;
  60     }
  61     return ret;
  62 }
  63
  64 static unsigned int nth_root(unsigned int x, unsigned int n) {   // x^(1/n)
  65     unsigned int ret=0, i, j;
  66
  67     do {
  68         ++ret;
  69         for(i=0,j=ret;i<n-1;i++) j*=ret;
  70     } while (j<=x);
  71
  72     return (ret-1);
  73 }
  74
  75 static float vorbisfloat2float(uint_fast32_t val) {
  76     double mant=val&0x1fffff;
  77     long exp=(val&0x7fe00000L)>>21;
  78     if (val&0x80000000) mant=-mant;
  79     return(ldexp(mant, exp-20-768));
  80 }
  81
  82
  83 // Generate vlc codes from vorbis huffman code lengths
  84
  85 static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
  86     uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  87         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
  88
  89     uint_fast8_t i,j;
  90     uint_fast32_t code,p;
  91
  92 #ifdef V_DEBUG
  93     GetBitContext gb;
  94 #endif
  95
  96     for(p=0;(bits[p]==0) && (p<num);++p);
  97     if (p==num) {
  98 //        av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
  99         return 0;
 100     }
 101
 102     codes[p]=0;
 103     for(i=0;i<bits[p];++i) {
 104         exit_at_level[i+1]=1<<i;
 105     }
 106
 107 #ifdef V_DEBUG
 108     av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
 109     init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
 110     for(i=0;i<bits[p];++i) {
 111         av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
 112     }
 113     av_log(vc->avccontext, AV_LOG_INFO, "\n");
 114 #endif
 115
 116     ++p;
 117
 118     for(;p<num;++p) {
 119         if (bits[p]==0) continue;
 120         // find corresponding exit(node which the tree can grow further from)
 121         for(i=bits[p];i>0;--i) {
 122             if (exit_at_level[i]) break;
 123         }
 124         if (!i) return 1; // overspecified tree
 125         code=exit_at_level[i];
 126         exit_at_level[i]=0;
 127         // construct code (append 0s to end) and introduce new exits
 128         for(j=i+1;j<=bits[p];++j) {
 129             exit_at_level[j]=code+(1<<(j-1));
 130         }
 131         codes[p]=code;
 132
 133 #ifdef V_DEBUG
 134         av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
 135         init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
 136         for(i=0;i<bits[p];++i) {
 137             av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
 138         }
 139         av_log(vc->avccontext, AV_LOG_INFO, "\n");
 140 #endif
 141
 142     }
 143
 144     //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
 145
 146     return 0;
 147 }
 148
 149 // Free all allocated memory -----------------------------------------
 150
 151 static void vorbis_free(vorbis_context *vc) {
 152     int_fast16_t i;
 153
 154     av_freep(&vc->channel_residues);
 155     av_freep(&vc->channel_floors);
 156     av_freep(&vc->saved);
 157     av_freep(&vc->ret);
 158
 159     av_freep(&vc->residues);
 160     av_freep(&vc->modes);
 161
 162     ff_mdct_end(&vc->mdct0);
 163     ff_mdct_end(&vc->mdct1);
 164
 165     for(i=0;i<vc->codebook_count;++i) {
 166         av_free(vc->codebooks[i].codevectors);
 167         free_vlc(&vc->codebooks[i].vlc);
 168     }
 169     av_freep(&vc->codebooks);
 170
 171     for(i=0;i<vc->floor_count;++i) {
 172         av_free(vc->floors[i].x_list);
 173         av_free(vc->floors[i].x_list_order);
 174         av_free(vc->floors[i].low_neighbour);
 175         av_free(vc->floors[i].high_neighbour);
 176     }
 177     av_freep(&vc->floors);
 178
 179     for(i=0;i<vc->mapping_count;++i) {
 180         av_free(vc->mappings[i].magnitude);
 181         av_free(vc->mappings[i].angle);
 182         av_free(vc->mappings[i].mux);
 183     }
 184     av_freep(&vc->mappings);
 185 }
 186
 187 // Parse setup header -------------------------------------------------
 188
 189 // Process codebooks part
 190
 191 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
 192     uint_fast16_t cb;
 193     uint_fast8_t *tmp_vlc_bits;
 194     uint_fast32_t *tmp_vlc_codes;
 195     GetBitContext *gb=&vc->gb;
 196
 197     vc->codebook_count=get_bits(gb,8)+1;
 198
 199     AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
 200
 201     vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
 202     tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
 203     tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
 204
 205     for(cb=0;cb<vc->codebook_count;++cb) {
 206         vorbis_codebook *codebook_setup=&vc->codebooks[cb];
 207         uint_fast8_t ordered;
 208         uint_fast32_t t, used_entries=0;
 209         uint_fast32_t entries;
 210
 211         AV_DEBUG(" %d. Codebook \n", cb);
 212
 213         if (get_bits(gb, 24)!=0x564342) {
 214             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook setup data corrupt. \n", cb);
 215             goto error;
 216         }
 217
 218         codebook_setup->dimensions=get_bits(gb, 16);
 219         if (codebook_setup->dimensions>16) {
 220             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
 221             goto error;
 222         }
 223         entries=get_bits(gb, 24);
 224         if (entries>V_MAX_VLCS) {
 225             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook has too many entries (%d). \n", cb, entries);
 226             goto error;
 227         }
 228
 229         ordered=get_bits1(gb);
 230
 231         AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
 232
 233         if (!ordered) {
 234             uint_fast16_t ce;
 235             uint_fast8_t flag;
 236             uint_fast8_t sparse=get_bits1(gb);
 237
 238             AV_DEBUG(" not ordered \n");
 239
 240             if (sparse) {
 241                 AV_DEBUG(" sparse \n");
 242
 243                 used_entries=0;
 244                 for(ce=0;ce<entries;++ce) {
 245                     flag=get_bits1(gb);
 246                     if (flag) {
 247                         tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
 248                         ++used_entries;
 249                     }
 250                     else tmp_vlc_bits[ce]=0;
 251                 }
 252             } else {
 253                 AV_DEBUG(" not sparse \n");
 254
 255                 used_entries=entries;
 256                 for(ce=0;ce<entries;++ce) {
 257                     tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
 258                 }
 259             }
 260         } else {
 261             uint_fast16_t current_entry=0;
 262             uint_fast8_t current_length=get_bits(gb, 5)+1;
 263
 264             AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
 265
 266             used_entries=entries;
 267             for(;current_entry<used_entries;++current_length) {
 268                 uint_fast16_t i, number;
 269
 270                 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
 271
 272                 number=get_bits(gb, ilog(entries - current_entry));
 273
 274                 AV_DEBUG(" number: %d \n", number);
 275
 276                 for(i=current_entry;i<number+current_entry;++i) {
 277                     if (i<used_entries) tmp_vlc_bits[i]=current_length;
 278                 }
 279
 280                 current_entry+=number;
 281             }
 282             if (current_entry>used_entries) {
 283                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
 284                 goto error;
 285             }
 286         }
 287
 288         codebook_setup->lookup_type=get_bits(gb, 4);
 289
 290         AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
 291
 292 // If the codebook is used for (inverse) VQ, calculate codevectors.
 293
 294         if (codebook_setup->lookup_type==1) {
 295             uint_fast16_t i, j, k;
 296             uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
 297             uint_fast16_t codebook_multiplicands[codebook_lookup_values];
 298
 299             float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
 300             float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
 301             uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
 302             uint_fast8_t codebook_sequence_p=get_bits1(gb);
 303
 304             AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
 305             AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
 306
 307             for(i=0;i<codebook_lookup_values;++i) {
 308                 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
 309
 310                 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
 311                 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
 312             }
 313
 314 // Weed out unused vlcs and build codevector vector
 315             codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
 316             for(j=0, i=0;i<entries;++i) {
 317                 uint_fast8_t dim=codebook_setup->dimensions;
 318
 319                 if (tmp_vlc_bits[i]) {
 320                     float last=0.0;
 321                     uint_fast32_t lookup_offset=i;
 322
 323 #ifdef V_DEBUG
 324                     av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
 325 #endif
 326
 327                     for(k=0;k<dim;++k) {
 328                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
 329                         codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
 330                         if (codebook_sequence_p) {
 331                             last=codebook_setup->codevectors[j*dim+k];
 332                         }
 333                         lookup_offset/=codebook_lookup_values;
 334                     }
 335                     tmp_vlc_bits[j]=tmp_vlc_bits[i];
 336
 337 #ifdef V_DEBUG
 338                     av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
 339                     for(k=0;k<dim;++k) {
 340                         av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
 341                     }
 342                     av_log(vc->avccontext, AV_LOG_INFO, "\n");
 343 #endif
 344
 345                     ++j;
 346                 }
 347             }
 348             if (j!=used_entries) {
 349                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
 350                 goto error;
 351             }
 352             entries=used_entries;
 353         }
 354         else if (codebook_setup->lookup_type>=2) {
 355             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
 356             goto error;
 357         }
 358
 359 // Initialize VLC table
 360         if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
 361             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
 362             goto error;
 363         }
 364         codebook_setup->maxdepth=0;
 365         for(t=0;t<entries;++t)
 366             if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
 367
 368         codebook_setup->maxdepth=(codebook_setup->maxdepth+V_NB_BITS-1)/V_NB_BITS;
 369
 370         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)) {
 371             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
 372             goto error;
 373         }
 374     }
 375
 376     av_free(tmp_vlc_bits);
 377     av_free(tmp_vlc_codes);
 378     return 0;
 379
 380 // Error:
 381 error:
 382     av_free(tmp_vlc_bits);
 383     av_free(tmp_vlc_codes);
 384     return 1;
 385 }
 386
 387 // Process time domain transforms part (unused in Vorbis I)
 388
 389 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
 390     GetBitContext *gb=&vc->gb;
 391     uint_fast8_t i;
 392     uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
 393
 394     for(i=0;i<vorbis_time_count;++i) {
 395         uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
 396
 397         AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
 398
 399         if (vorbis_tdtransform) {
 400             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
 401             return 1;
 402         }
 403     }
 404     return 0;
 405 }
 406
 407 // Process floors part - only floor type 1 is supported
 408
 409 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
 410     GetBitContext *gb=&vc->gb;
 411     uint_fast16_t i,j,k;
 412
 413     vc->floor_count=get_bits(gb, 6)+1;
 414
 415     vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
 416
 417     for (i=0;i<vc->floor_count;++i) {
 418         vorbis_floor *floor_setup=&vc->floors[i];
 419
 420         floor_setup->floor_type=get_bits(gb, 16);
 421
 422         AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
 423
 424         if (floor_setup->floor_type==1) {
 425             uint_fast8_t maximum_class=0;
 426             uint_fast8_t rangebits;
 427             uint_fast16_t floor1_values=2;
 428
 429             floor_setup->partitions=get_bits(gb, 5);
 430
 431             AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions);
 432
 433             for(j=0;j<floor_setup->partitions;++j) {
 434                 floor_setup->partition_class[j]=get_bits(gb, 4);
 435                 if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];
 436
 437                 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]);
 438
 439             }
 440
 441             AV_DEBUG(" maximum class %d \n", maximum_class);
 442
 443             floor_setup->maximum_class=maximum_class;
 444
 445             for(j=0;j<=maximum_class;++j) {
 446                 floor_setup->class_dimensions[j]=get_bits(gb, 3)+1;
 447                 floor_setup->class_subclasses[j]=get_bits(gb, 2);
 448
 449                 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);
 450
 451                 if (floor_setup->class_subclasses[j]) {
 452                     floor_setup->class_masterbook[j]=get_bits(gb, 8);
 453
 454                     AV_DEBUG("   masterbook: %d \n", floor_setup->class_masterbook[j]);
 455                 }
 456
 457                 for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) {
 458                     floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1;
 459
 460                     AV_DEBUG("    book %d. : %d \n", k, floor_setup->subclass_books[j][k]);
 461                 }
 462             }
 463
 464             floor_setup->multiplier=get_bits(gb, 2)+1;
 465             floor_setup->x_list_dim=2;
 466
 467             for(j=0;j<floor_setup->partitions;++j) {
 468                 floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]];
 469             }
 470
 471             floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
 472             floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
 473             floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
 474             floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
 475
 476
 477             rangebits=get_bits(gb, 4);
 478             floor_setup->x_list[0] = 0;
 479             floor_setup->x_list[1] = (1<<rangebits);
 480
 481             for(j=0;j<floor_setup->partitions;++j) {
 482                 for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) {
 483                     floor_setup->x_list[floor1_values]=get_bits(gb, rangebits);
 484
 485                     AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]);
 486                 }
 487             }
 488
 489 // Precalculate order of x coordinates - needed for decode
 490
 491             for(k=0;k<floor_setup->x_list_dim;++k) {
 492                 floor_setup->x_list_order[k]=k;
 493             }
 494
 495             for(k=0;k<floor_setup->x_list_dim-1;++k) {   // FIXME optimize sorting ?
 496                 for(j=k+1;j<floor_setup->x_list_dim;++j) {
 497                     if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {
 498                         uint_fast16_t tmp=floor_setup->x_list_order[k];
 499                         floor_setup->x_list_order[k]=floor_setup->x_list_order[j];
 500                         floor_setup->x_list_order[j]=tmp;
 501                     }
 502                 }
 503             }
 504
 505 // Precalculate low and high neighbours
 506
 507             for(k=2;k<floor_setup->x_list_dim;++k) {
 508                 floor_setup->low_neighbour[k]=0;
 509                 floor_setup->high_neighbour[k]=1;  // correct according to SPEC requirements
 510
 511                 for (j=0;j<k;++j) {
 512                     if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&
 513                       (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) {
 514                         floor_setup->low_neighbour[k]=j;
 515                     }
 516                     if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&
 517                       (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) {
 518                         floor_setup->high_neighbour[k]=j;
 519                     }
 520                 }
 521             }
 522         }
 523         else {
 524             av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");
 525             return 1;
 526         }
 527     }
 528     return 0;
 529 }
 530
 531 // Process residues part
 532
 533 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
 534     GetBitContext *gb=&vc->gb;
 535     uint_fast8_t i, j, k;
 536
 537     vc->residue_count=get_bits(gb, 6)+1;
 538     vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
 539
 540     AV_DEBUG(" There are %d residues. \n", vc->residue_count);
 541
 542     for(i=0;i<vc->residue_count;++i) {
 543         vorbis_residue *res_setup=&vc->residues[i];
 544         uint_fast8_t cascade[64];
 545         uint_fast8_t high_bits;
 546         uint_fast8_t low_bits;
 547
 548         res_setup->type=get_bits(gb, 16);
 549
 550         AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
 551
 552         res_setup->begin=get_bits(gb, 24);
 553         res_setup->end=get_bits(gb, 24);
 554         res_setup->partition_size=get_bits(gb, 24)+1;
 555         res_setup->classifications=get_bits(gb, 6)+1;
 556         res_setup->classbook=get_bits(gb, 8);
 557
 558         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,
 559           res_setup->classifications, res_setup->classbook);
 560
 561         for(j=0;j<res_setup->classifications;++j) {
 562             high_bits=0;
 563             low_bits=get_bits(gb, 3);
 564             if (get_bits1(gb)) {
 565                 high_bits=get_bits(gb, 5);
 566             }
 567             cascade[j]=(high_bits<<3)+low_bits;
 568
 569             AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
 570         }
 571
 572         res_setup->maxpass=0;
 573         for(j=0;j<res_setup->classifications;++j) {
 574             for(k=0;k<8;++k) {
 575                 if (cascade[j]&(1<<k)) {
 576                         res_setup->books[j][k]=get_bits(gb, 8);
 577
 578                     AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
 579
 580                     if (k>res_setup->maxpass) {
 581                         res_setup->maxpass=k;
 582                     }
 583                 } else {
 584                     res_setup->books[j][k]=-1;
 585                 }
 586             }
 587         }
 588     }
 589     return 0;
 590 }
 591
 592 // Process mappings part
 593
 594 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
 595     GetBitContext *gb=&vc->gb;
 596     uint_fast8_t i, j;
 597
 598     vc->mapping_count=get_bits(gb, 6)+1;
 599     vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
 600
 601     AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
 602
 603     for(i=0;i<vc->mapping_count;++i) {
 604         vorbis_mapping *mapping_setup=&vc->mappings[i];
 605
 606         if (get_bits(gb, 16)) {
 607             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
 608             return 1;
 609         }
 610         if (get_bits1(gb)) {
 611             mapping_setup->submaps=get_bits(gb, 4)+1;
 612         } else {
 613             mapping_setup->submaps=1;
 614         }
 615
 616         if (get_bits1(gb)) {
 617             mapping_setup->coupling_steps=get_bits(gb, 8)+1;
 618             mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
 619             mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
 620             for(j=0;j<mapping_setup->coupling_steps;++j) {
 621                 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
 622                 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
 623                 // FIXME: sanity checks
 624             }
 625         } else {
 626             mapping_setup->coupling_steps=0;
 627         }
 628
 629         AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
 630
 631         if(get_bits(gb, 2)) {
 632             av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
 633             return 1; // following spec.
 634         }
 635
 636         if (mapping_setup->submaps>1) {
 637             mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
 638             for(j=0;j<vc->audio_channels;++j) {
 639                 mapping_setup->mux[j]=get_bits(gb, 4);
 640             }
 641         }
 642
 643         for(j=0;j<mapping_setup->submaps;++j) {
 644             get_bits(gb, 8); // FIXME check?
 645             mapping_setup->submap_floor[j]=get_bits(gb, 8);
 646             mapping_setup->submap_residue[j]=get_bits(gb, 8);
 647
 648             AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
 649         }
 650     }
 651     return 0;
 652 }
 653
 654 // Process modes part
 655
 656 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
 657     GetBitContext *gb=&vc->gb;
 658     uint_fast8_t i;
 659
 660     vc->mode_count=get_bits(gb, 6)+1;
 661     vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
 662
 663     AV_DEBUG(" There are %d modes.\n", vc->mode_count);
 664
 665     for(i=0;i<vc->mode_count;++i) {
 666         vorbis_mode *mode_setup=&vc->modes[i];
 667
 668         mode_setup->blockflag=get_bits(gb, 1);
 669         mode_setup->windowtype=get_bits(gb, 16); //FIXME check
 670         mode_setup->transformtype=get_bits(gb, 16); //FIXME check
 671         mode_setup->mapping=get_bits(gb, 8); //FIXME check
 672
 673         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);
 674     }
 675     return 0;
 676 }
 677
 678 // Process the whole setup header using the functions above
 679
 680 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
 681     GetBitContext *gb=&vc->gb;
 682
 683     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
 684     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
 685     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
 686         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
 687         return 1;
 688     }
 689
 690     if (vorbis_parse_setup_hdr_codebooks(vc)) {
 691         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
 692         return 2;
 693     }
 694     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
 695         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
 696         return 3;
 697     }
 698     if (vorbis_parse_setup_hdr_floors(vc)) {
 699         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
 700         return 4;
 701     }
 702     if (vorbis_parse_setup_hdr_residues(vc)) {
 703         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
 704         return 5;
 705     }
 706     if (vorbis_parse_setup_hdr_mappings(vc)) {
 707         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
 708         return 6;
 709     }
 710     if (vorbis_parse_setup_hdr_modes(vc)) {
 711         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
 712         return 7;
 713     }
 714     if (!get_bits1(gb)) {
 715         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
 716         return 8; // framing flag bit unset error
 717     }
 718
 719     return 0;
 720 }
 721
 722 // Process the identification header
 723
 724 static int vorbis_parse_id_hdr(vorbis_context *vc){
 725     GetBitContext *gb=&vc->gb;
 726     uint_fast8_t bl0, bl1;
 727     const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
 728
 729     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
 730     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
 731     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
 732         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
 733         return 1;
 734     }
 735
 736     vc->version=get_bits_long_le(gb, 32);    //FIXME check 0
 737     vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
 738     vc->audio_samplerate=get_bits_long_le(gb, 32);   //FIXME check >0
 739     vc->bitrate_maximum=get_bits_long_le(gb, 32);
 740     vc->bitrate_nominal=get_bits_long_le(gb, 32);
 741     vc->bitrate_minimum=get_bits_long_le(gb, 32);
 742     bl0=get_bits(gb, 4);
 743     bl1=get_bits(gb, 4);
 744     vc->blocksize_0=(1<<bl0);
 745     vc->blocksize_1=(1<<bl1);
 746     if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
 747         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
 748         return 3;
 749     }
 750     vc->swin=vwin[bl0-6];
 751     vc->lwin=vwin[bl1-6];
 752
 753     if ((get_bits1(gb)) == 0) {
 754         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
 755         return 2;
 756     }
 757
 758     vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
 759     vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
 760     vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
 761     vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
 762     vc->saved_start=0;
 763
 764     ff_mdct_init(&vc->mdct0, bl0, 1);
 765     ff_mdct_init(&vc->mdct1, bl1, 1);
 766
 767     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 ",
 768             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
 769
 770 /*
 771     BLK=vc->blocksize_0;
 772     for(i=0;i<BLK/2;++i) {
 773         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)));
 774     }
 775 */
 776
 777     return 0;
 778 }
 779
 780 // Process the extradata using the functions above (identification header, setup header)
 781
 782 static int vorbis_decode_init(AVCodecContext *avccontext) {
 783     vorbis_context *vc = avccontext->priv_data ;
 784     uint8_t *headers = avccontext->extradata;
 785     int headers_len=avccontext->extradata_size;
 786     uint8_t *header_start[3];
 787     int header_len[3];
 788     GetBitContext *gb = &(vc->gb);
 789     int i, j, hdr_type;
 790
 791     vc->avccontext = avccontext;
 792
 793     if (!headers_len) {
 794         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 795         return -1;
 796     }
 797
 798     if(headers[0] == 0 && headers[1] == 30) {
 799         for(i = 0; i < 3; i++){
 800             header_len[i] = *headers++ << 8;
 801             header_len[i] += *headers++;
 802             header_start[i] = headers;
 803             headers += header_len[i];
 804         }
 805     } else if(headers[0] == 2) {
 806         for(j=1,i=0;i<2;++i, ++j) {
 807             header_len[i]=0;
 808             while(j<headers_len && headers[j]==0xff) {
 809                 header_len[i]+=0xff;
 810                 ++j;
 811             }
 812             if (j>=headers_len) {
 813                 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 814                 return -1;
 815             }
 816             header_len[i]+=headers[j];
 817         }
 818         header_len[2]=headers_len-header_len[0]-header_len[1]-j;
 819         headers+=j;
 820         header_start[0] = headers;
 821         header_start[1] = header_start[0] + header_len[0];
 822         header_start[2] = header_start[1] + header_len[1];
 823     } else {
 824         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 825         return -1;
 826     }
 827
 828     init_get_bits(gb, header_start[0], header_len[0]*8);
 829     hdr_type=get_bits(gb, 8);
 830     if (hdr_type!=1) {
 831         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
 832         return -1;
 833     }
 834     if (vorbis_parse_id_hdr(vc)) {
 835         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
 836         vorbis_free(vc);
 837         return -1;
 838     }
 839
 840     init_get_bits(gb, header_start[2], header_len[2]*8);
 841     hdr_type=get_bits(gb, 8);
 842     if (hdr_type!=5) {
 843         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
 844         return -1;
 845     }
 846     if (vorbis_parse_setup_hdr(vc)) {
 847         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
 848         vorbis_free(vc);
 849         return -1;
 850     }
 851
 852     avccontext->channels = vc->audio_channels;
 853     avccontext->sample_rate = vc->audio_samplerate;
 854
 855     return 0 ;
 856 }
 857
 858 // Decode audiopackets -------------------------------------------------
 859
 860 // Read and decode floor (type 1 only)
 861
 862 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {
 863     GetBitContext *gb=&vc->gb;
 864     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
 865     uint_fast16_t range=range_v[vf->multiplier-1];
 866     uint_fast16_t floor1_Y[vf->x_list_dim];
 867     uint_fast16_t floor1_Y_final[vf->x_list_dim];
 868     uint_fast8_t floor1_flag[vf->x_list_dim];
 869     uint_fast8_t class_;
 870     uint_fast8_t cdim;
 871     uint_fast8_t cbits;
 872     uint_fast8_t csub;
 873     uint_fast8_t cval;
 874     int_fast16_t book;
 875     uint_fast16_t offset;
 876     uint_fast16_t i,j;
 877     uint_fast16_t *floor_x_sort=vf->x_list_order;
 878     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
 879     int_fast16_t dy, err;
 880     uint_fast16_t lx,hx, ly, hy=0;
 881
 882
 883     if (!get_bits1(gb)) return 1; // silence
 884
 885 // Read values (or differences) for the floor's points
 886
 887     floor1_Y[0]=get_bits(gb, ilog(range-1));
 888     floor1_Y[1]=get_bits(gb, ilog(range-1));
 889
 890     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
 891
 892     offset=2;
 893     for(i=0;i<vf->partitions;++i) {
 894         class_=vf->partition_class[i];
 895         cdim=vf->class_dimensions[class_];
 896         cbits=vf->class_subclasses[class_];
 897         csub=(1<<cbits)-1;
 898         cval=0;
 899
 900         AV_DEBUG("Cbits %d \n", cbits);
 901
 902         if (cbits) { // this reads all subclasses for this partition's class
 903             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
 904             V_NB_BITS, vc->codebooks[vf->class_masterbook[class_]].maxdepth);
 905         }
 906
 907         for(j=0;j<cdim;++j) {
 908             book=vf->subclass_books[class_][cval & csub];
 909
 910             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
 911
 912             cval=cval>>cbits;
 913             if (book>0) {
 914                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
 915                 V_NB_BITS, vc->codebooks[book].maxdepth);
 916             } else {
 917                 floor1_Y[offset+j]=0;
 918             }
 919
 920             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
 921         }
 922         offset+=cdim;
 923     }
 924
 925 // Amplitude calculation from the differences
 926
 927     floor1_flag[0]=1;
 928     floor1_flag[1]=1;
 929     floor1_Y_final[0]=floor1_Y[0];
 930     floor1_Y_final[1]=floor1_Y[1];
 931
 932     for(i=2;i<vf->x_list_dim;++i) {
 933         uint_fast16_t val, highroom, lowroom, room;
 934         uint_fast16_t high_neigh_offs;
 935         uint_fast16_t low_neigh_offs;
 936
 937         low_neigh_offs=vf->low_neighbour[i];
 938         high_neigh_offs=vf->high_neighbour[i];
 939         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
 940         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
 941         ady= ABS(dy);
 942         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
 943         off=err/adx;
 944         if (dy<0) {
 945             predicted=floor1_Y_final[low_neigh_offs]-off;
 946         } else {
 947             predicted=floor1_Y_final[low_neigh_offs]+off;
 948         } // render_point end
 949
 950         val=floor1_Y[i];
 951         highroom=range-predicted;
 952         lowroom=predicted;
 953         if (highroom < lowroom) {
 954             room=highroom*2;
 955         } else {
 956             room=lowroom*2;   // SPEC mispelling
 957         }
 958         if (val) {
 959             floor1_flag[low_neigh_offs]=1;
 960             floor1_flag[high_neigh_offs]=1;
 961             floor1_flag[i]=1;
 962             if (val>=room) {
 963                 if (highroom > lowroom) {
 964                     floor1_Y_final[i]=val-lowroom+predicted;
 965                 } else {
 966                     floor1_Y_final[i]=predicted-val+highroom-1;
 967                 }
 968             } else {
 969                 if (val & 1) {
 970                     floor1_Y_final[i]=predicted-(val+1)/2;
 971                 } else {
 972                     floor1_Y_final[i]=predicted+val/2;
 973                 }
 974             }
 975         } else {
 976             floor1_flag[i]=0;
 977             floor1_Y_final[i]=predicted;
 978         }
 979
 980         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
 981     }
 982
 983 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
 984
 985     hx=0;
 986     lx=0;
 987     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
 988
 989     vec[0]=floor1_inverse_db_table[ly];
 990
 991     for(i=1;i<vf->x_list_dim;++i) {
 992         AV_DEBUG(" Looking at post %d \n", i);
 993
 994         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
 995             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
 996
 997             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
 998             hx=vf->x_list[floor_x_sort[i]];
 999
1000             dy=hy-ly;
1001             adx=hx-lx;
1002             ady= (dy<0) ? -dy:dy;//ABS(dy);
1003             base=dy/adx;
1004
1005             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1006
1007             x=lx;
1008             y=ly;
1009             err=0;
1010             if (dy<0) {
1011                 sy=base-1;
1012             } else {
1013                 sy=base+1;
1014             }
1015             ady=ady-(base<0 ? -base : base)*adx;
1016             vec[x]=floor1_inverse_db_table[y];
1017
1018             AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1019
1020             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1021                 err+=ady;
1022                 if (err>=adx) {
1023                     err-=adx;
1024                     y+=sy;
1025                 } else {
1026                     y+=base;
1027                 }
1028                 vec[x]=floor1_inverse_db_table[y];
1029
1030                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1031             }
1032
1033 /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1034                 dy=hy-ly;
1035                 adx=hx-lx;
1036                 ady= dy<0 ? -dy : dy;
1037                 err=ady*j;
1038                 off=err/adx;
1039                 if (dy<0) {
1040                     predicted=ly-off;
1041                 } else {
1042                     predicted=ly+off;
1043                 }
1044                 if (lx+j < vf->x_list[1]) {
1045                     vec[lx+j]=floor1_inverse_db_table[predicted];
1046                 }
1047             }*/
1048
1049             lx=hx;
1050             ly=hy;
1051         }
1052     }
1053
1054     if (hx<vf->x_list[1]) {
1055         for(i=hx;i<vf->x_list[1];++i) {
1056             vec[i]=floor1_inverse_db_table[hy];
1057         }
1058     }
1059
1060     AV_DEBUG(" Floor decoded\n");
1061
1062     return 0;
1063 }
1064
1065 // Read and decode residue
1066
1067 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) {
1068     GetBitContext *gb=&vc->gb;
1069     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1070     uint_fast16_t n_to_read=vr->end-vr->begin;
1071     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1072     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1073     uint_fast8_t pass;
1074     uint_fast8_t ch_used;
1075     uint_fast8_t i,j,l;
1076     uint_fast16_t k;
1077
1078     if (vr->type==2) {
1079         for(j=1;j<ch;++j) {
1080                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1081         }
1082         if (do_not_decode[0]) return 0;
1083         ch_used=1;
1084     } else {
1085         ch_used=ch;
1086     }
1087
1088     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1089
1090     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1091         uint_fast16_t voffset;
1092         uint_fast16_t partition_count;
1093         uint_fast16_t j_times_ptns_to_read;
1094
1095         voffset=vr->begin;
1096         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1097             if (!pass) {
1098                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1099                     if (!do_not_decode[j]) {
1100                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1101                         V_NB_BITS, vc->codebooks[vr->classbook].maxdepth);
1102
1103                         AV_DEBUG("Classword: %d \n", temp);
1104
1105                         for(i=0;i<c_p_c;++i) {
1106                             uint_fast32_t temp2;
1107
1108                             temp2=temp/vr->classifications;
1109                             classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1110                             temp=temp2;
1111                         }
1112                     }
1113                     j_times_ptns_to_read+=ptns_to_read;
1114                 }
1115             }
1116             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1117                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1118                     uint_fast16_t voffs;
1119
1120                     if (!do_not_decode[j]) {
1121                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1122                         int_fast16_t vqbook=vr->books[vqclass][pass];
1123
1124                         if (vqbook>=0) {
1125                             uint_fast16_t coffs;
1126
1127                             if (vr->type==0) {
1128                                 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1129
1130                                 voffs=voffset+j*vlen;
1131                                 for(k=0;k<step;++k) {
1132                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1133                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1134                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l) {
1135                                         vec[voffs+k+l*step]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1136                                     }
1137                                 }
1138                             }
1139                             else if (vr->type==1) {
1140                                 voffs=voffset+j*vlen;
1141                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1142                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1143                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1144                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1145                                         vec[voffs]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1146
1147                                         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);
1148                                     }
1149                                 }
1150                             }
1151                             else if (vr->type==2 && ch==2) { // most frequent case optimized
1152                                 voffs=voffset;
1153
1154                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1155                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1156                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1157                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1158                                         vec[(voffs>>1)+((voffs&1) ? vlen : 0)]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1159
1160                                         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);
1161                                     }
1162                                 }
1163
1164                             }
1165                             else if (vr->type==2) {
1166                                 voffs=voffset;
1167
1168                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1169                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1170                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1171                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1172                                         vec[voffs/ch+(voffs%ch)*vlen]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1173
1174                                         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);
1175                                     }
1176                                 }
1177                             } else {
1178                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1179                                 return 1;
1180                             }
1181                         }
1182                     }
1183                     j_times_ptns_to_read+=ptns_to_read;
1184                 }
1185                 ++partition_count;
1186                 voffset+=vr->partition_size;
1187             }
1188         }
1189     }
1190     return 0;
1191 }
1192
1193 // Decode the audio packet using the functions above
1194
1195 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1196     GetBitContext *gb=&vc->gb;
1197
1198     uint_fast8_t previous_window=0,next_window=0;
1199     uint_fast8_t mode_number;
1200     uint_fast16_t blocksize;
1201     int_fast32_t i,j;
1202     uint_fast8_t no_residue[vc->audio_channels];
1203     uint_fast8_t do_not_decode[vc->audio_channels];
1204     vorbis_mapping *mapping;
1205     float *ch_res_ptr=vc->channel_residues;
1206     float *ch_floor_ptr=vc->channel_floors;
1207     uint_fast8_t res_chan[vc->audio_channels];
1208     uint_fast8_t res_num=0;
1209     int_fast16_t retlen=0;
1210     uint_fast16_t saved_start=0;
1211
1212     if (get_bits1(gb)) {
1213         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1214         return -1; // packet type not audio
1215     }
1216
1217     if (vc->mode_count==1) {
1218         mode_number=0;
1219     } else {
1220         mode_number=get_bits(gb, ilog(vc->mode_count-1));
1221     }
1222     mapping=&vc->mappings[vc->modes[mode_number].mapping];
1223
1224     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1225
1226     if (vc->modes[mode_number].blockflag) {
1227         previous_window=get_bits1(gb);
1228         next_window=get_bits1(gb);
1229     }
1230
1231     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1232     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1233     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1234
1235 // Decode floor(1)
1236
1237     for(i=0;i<vc->audio_channels;++i) {
1238         vorbis_floor *floor;
1239         if (mapping->submaps>1) {
1240             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1241         } else {
1242             floor=&vc->floors[mapping->submap_floor[0]];
1243         }
1244
1245         no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);
1246         ch_floor_ptr+=blocksize/2;
1247     }
1248
1249 // Nonzero vector propagate
1250
1251     for(i=mapping->coupling_steps-1;i>=0;--i) {
1252         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1253             no_residue[mapping->magnitude[i]]=0;
1254             no_residue[mapping->angle[i]]=0;
1255         }
1256     }
1257
1258 // Decode residue
1259
1260     for(i=0;i<mapping->submaps;++i) {
1261         vorbis_residue *residue;
1262         uint_fast8_t ch=0;
1263
1264         for(j=0;j<vc->audio_channels;++j) {
1265             if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1266                 res_chan[j]=res_num;
1267                 if (no_residue[j]) {
1268                     do_not_decode[ch]=1;
1269                 } else {
1270                     do_not_decode[ch]=0;
1271                 }
1272                 ++ch;
1273                 ++res_num;
1274             }
1275         }
1276         residue=&vc->residues[mapping->submap_residue[i]];
1277         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1278
1279         ch_res_ptr+=ch*blocksize/2;
1280     }
1281
1282 // Inverse coupling
1283
1284     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1285         float *mag, *ang;
1286
1287         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1288         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1289         for(j=0;j<blocksize/2;++j) {
1290             float temp;
1291             if (mag[j]>0.0) {
1292                 if (ang[j]>0.0) {
1293                     ang[j]=mag[j]-ang[j];
1294                 } else {
1295                     temp=ang[j];
1296                     ang[j]=mag[j];
1297                     mag[j]+=temp;
1298                 }
1299             } else {
1300                 if (ang[j]>0.0) {
1301                     ang[j]+=mag[j];
1302                 } else {
1303                     temp=ang[j];
1304                     ang[j]=mag[j];
1305                     mag[j]-=temp;
1306                 }
1307             }
1308         }
1309     }
1310
1311 // Dotproduct
1312
1313     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1314         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1315
1316         for(i=0;i<blocksize/2;++i) {
1317             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1318         }
1319     }
1320
1321 // MDCT, overlap/add, save data for next overlapping  FPMATH
1322
1323     for(j=0;j<vc->audio_channels;++j) {
1324         uint_fast8_t step=vc->audio_channels;
1325         uint_fast16_t k;
1326         float *saved=vc->saved+j*vc->blocksize_1/2;
1327         float *ret=vc->ret;
1328         const float *lwin=vc->lwin;
1329         const float *swin=vc->swin;
1330         float buf[blocksize];
1331         float buf_tmp[blocksize];
1332
1333         ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1334
1335         saved_start=vc->saved_start;
1336
1337         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1338
1339         if (vc->modes[mode_number].blockflag) {
1340             // -- overlap/add
1341             if (previous_window) {
1342                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1343                     ret[k]=saved[i]+buf[i]*lwin[i];
1344                 }
1345                 retlen=vc->blocksize_1/2;
1346             } else {
1347                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1348                     ret[k]=saved[i]+buf[(vc->blocksize_1-vc->blocksize_0)/4+i]*swin[i];
1349                 }
1350                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1351                     ret[k]=buf[vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4+i];
1352                 }
1353                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1354             }
1355             // -- save
1356             if (next_window) {
1357                 for(i=0;i<vc->blocksize_1/2;++i) {
1358                     saved[i]=buf[vc->blocksize_1/2+i]*lwin[vc->blocksize_1/2-1-i];
1359                 }
1360                 saved_start=0;
1361             } else {
1362                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1363                 for(i=0;i<saved_start;++i) {
1364                     saved[i]=buf[vc->blocksize_1/2+i];
1365                 }
1366                 for(i=0;i<vc->blocksize_0/2;++i) {
1367                     saved[saved_start+i]=buf[vc->blocksize_1/2+saved_start+i]*swin[vc->blocksize_0/2-1-i];
1368                 }
1369             }
1370         } else {
1371             // --overlap/add
1372             for(k=j, i=0;i<saved_start;++i, k+=step) {
1373                 ret[k]=saved[i];
1374             }
1375             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1376                 ret[k]=saved[saved_start+i]+buf[i]*swin[i];
1377             }
1378             retlen=saved_start+vc->blocksize_0/2;
1379             // -- save
1380             for(i=0;i<vc->blocksize_0/2;++i) {
1381                 saved[i]=buf[vc->blocksize_0/2+i]*swin[vc->blocksize_0/2-1-i];
1382             }
1383             saved_start=0;
1384         }
1385     }
1386     vc->saved_start=saved_start;
1387
1388     return retlen*vc->audio_channels;
1389 }
1390
1391 // Return the decoded audio packet through the standard api
1392
1393 static int vorbis_decode_frame(AVCodecContext *avccontext,
1394                         void *data, int *data_size,
1395                         uint8_t *buf, int buf_size)
1396 {
1397     vorbis_context *vc = avccontext->priv_data ;
1398     GetBitContext *gb = &(vc->gb);
1399
1400     int_fast16_t i, len;
1401
1402     if(!buf_size){
1403         return 0;
1404     }
1405
1406     AV_DEBUG("packet length %d \n", buf_size);
1407
1408     init_get_bits(gb, buf, buf_size*8);
1409
1410     len=vorbis_parse_audio_packet(vc);
1411
1412     if (len<=0) {
1413         *data_size=0;
1414         return buf_size;
1415     }
1416
1417     if (!vc->first_frame) {
1418         vc->first_frame=1;
1419         *data_size=0;
1420         return buf_size ;
1421     }
1422
1423     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1424
1425     for(i=0;i<len;++i) {
1426         int_fast32_t tmp;
1427
1428         tmp=vc->ret[i]*32768;
1429         if (tmp>32767) tmp=32767;
1430         if (tmp<-32768) tmp=-32768;
1431         ((int16_t*)data)[i]=tmp;
1432     }
1433     *data_size=len*2;
1434
1435     return buf_size ;
1436 }
1437
1438 // Close decoder
1439
1440 static int vorbis_decode_close(AVCodecContext *avccontext) {
1441     vorbis_context *vc = avccontext->priv_data;
1442
1443     vorbis_free(vc);
1444
1445     return 0 ;
1446 }
1447
1448 AVCodec vorbis_decoder = {
1449     "vorbis",
1450     CODEC_TYPE_AUDIO,
1451     CODEC_ID_VORBIS,
1452     sizeof(vorbis_context),
1453     vorbis_decode_init,
1454     NULL,
1455     vorbis_decode_close,
1456     vorbis_decode_frame,
1457 };
1458