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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 8
  34 #define V_NB_BITS2 11
  35 #define V_MAX_VLCS (1<<16)
  36
  37 #ifndef V_DEBUG
  38 #define AV_DEBUG(...)
  39 #endif
  40
  41 #undef NDEBUG
  42 #include <assert.h>
  43
  44 /* Helper functions */
  45
  46 /**
  47  *  reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
  48  */
  49 unsigned int get_bits_long_le(GetBitContext *s, int n){
  50     if(n<=17) return get_bits(s, n);
  51     else{
  52         int ret= get_bits(s, 16);
  53         return ret | (get_bits(s, n-16) << 16);
  54     }
  55 }
  56
  57 #define ilog(i) av_log2(2*(i))
  58
  59 static unsigned int nth_root(unsigned int x, unsigned int n) {   // x^(1/n)
  60     unsigned int ret=0, i, j;
  61
  62     do {
  63         ++ret;
  64         for(i=0,j=ret;i<n-1;i++) j*=ret;
  65     } while (j<=x);
  66
  67     return (ret-1);
  68 }
  69
  70 static float vorbisfloat2float(uint_fast32_t val) {
  71     double mant=val&0x1fffff;
  72     long exp=(val&0x7fe00000L)>>21;
  73     if (val&0x80000000) mant=-mant;
  74     return(ldexp(mant, exp-20-768));
  75 }
  76
  77
  78 // Generate vlc codes from vorbis huffman code lengths
  79
  80 static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
  81     uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  82         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
  83
  84     uint_fast8_t i,j;
  85     uint_fast32_t code,p;
  86
  87 #ifdef V_DEBUG
  88     GetBitContext gb;
  89 #endif
  90
  91     for(p=0;(bits[p]==0) && (p<num);++p);
  92     if (p==num) {
  93 //        av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
  94         return 0;
  95     }
  96
  97     codes[p]=0;
  98     for(i=0;i<bits[p];++i) {
  99         exit_at_level[i+1]=1<<i;
 100     }
 101
 102 #ifdef V_DEBUG
 103     av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
 104     init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
 105     for(i=0;i<bits[p];++i) {
 106         av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
 107     }
 108     av_log(vc->avccontext, AV_LOG_INFO, "\n");
 109 #endif
 110
 111     ++p;
 112
 113     for(;p<num;++p) {
 114         if (bits[p]==0) continue;
 115         // find corresponding exit(node which the tree can grow further from)
 116         for(i=bits[p];i>0;--i) {
 117             if (exit_at_level[i]) break;
 118         }
 119         if (!i) return 1; // overspecified tree
 120         code=exit_at_level[i];
 121         exit_at_level[i]=0;
 122         // construct code (append 0s to end) and introduce new exits
 123         for(j=i+1;j<=bits[p];++j) {
 124             exit_at_level[j]=code+(1<<(j-1));
 125         }
 126         codes[p]=code;
 127
 128 #ifdef V_DEBUG
 129         av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
 130         init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
 131         for(i=0;i<bits[p];++i) {
 132             av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
 133         }
 134         av_log(vc->avccontext, AV_LOG_INFO, "\n");
 135 #endif
 136
 137     }
 138
 139     //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
 140
 141     return 0;
 142 }
 143
 144 // Free all allocated memory -----------------------------------------
 145
 146 static void vorbis_free(vorbis_context *vc) {
 147     int_fast16_t i;
 148
 149     av_freep(&vc->channel_residues);
 150     av_freep(&vc->channel_floors);
 151     av_freep(&vc->saved);
 152     av_freep(&vc->ret);
 153     av_freep(&vc->buf);
 154     av_freep(&vc->buf_tmp);
 155
 156     av_freep(&vc->residues);
 157     av_freep(&vc->modes);
 158
 159     ff_mdct_end(&vc->mdct0);
 160     ff_mdct_end(&vc->mdct1);
 161
 162     for(i=0;i<vc->codebook_count;++i) {
 163         av_free(vc->codebooks[i].codevectors);
 164         free_vlc(&vc->codebooks[i].vlc);
 165     }
 166     av_freep(&vc->codebooks);
 167
 168     for(i=0;i<vc->floor_count;++i) {
 169         av_free(vc->floors[i].x_list);
 170         av_free(vc->floors[i].x_list_order);
 171         av_free(vc->floors[i].low_neighbour);
 172         av_free(vc->floors[i].high_neighbour);
 173     }
 174     av_freep(&vc->floors);
 175
 176     for(i=0;i<vc->mapping_count;++i) {
 177         av_free(vc->mappings[i].magnitude);
 178         av_free(vc->mappings[i].angle);
 179         av_free(vc->mappings[i].mux);
 180     }
 181     av_freep(&vc->mappings);
 182 }
 183
 184 // Parse setup header -------------------------------------------------
 185
 186 // Process codebooks part
 187
 188 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
 189     uint_fast16_t cb;
 190     uint_fast8_t *tmp_vlc_bits;
 191     uint_fast32_t *tmp_vlc_codes;
 192     GetBitContext *gb=&vc->gb;
 193
 194     vc->codebook_count=get_bits(gb,8)+1;
 195
 196     AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
 197
 198     vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
 199     tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
 200     tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
 201
 202     for(cb=0;cb<vc->codebook_count;++cb) {
 203         vorbis_codebook *codebook_setup=&vc->codebooks[cb];
 204         uint_fast8_t ordered;
 205         uint_fast32_t t, used_entries=0;
 206         uint_fast32_t entries;
 207
 208         AV_DEBUG(" %d. Codebook \n", cb);
 209
 210         if (get_bits(gb, 24)!=0x564342) {
 211             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
 212             goto error;
 213         }
 214
 215         codebook_setup->dimensions=get_bits(gb, 16);
 216         if (codebook_setup->dimensions>16) {
 217             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
 218             goto error;
 219         }
 220         entries=get_bits(gb, 24);
 221         if (entries>V_MAX_VLCS) {
 222             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
 223             goto error;
 224         }
 225
 226         ordered=get_bits1(gb);
 227
 228         AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
 229
 230         if (!ordered) {
 231             uint_fast16_t ce;
 232             uint_fast8_t flag;
 233             uint_fast8_t sparse=get_bits1(gb);
 234
 235             AV_DEBUG(" not ordered \n");
 236
 237             if (sparse) {
 238                 AV_DEBUG(" sparse \n");
 239
 240                 used_entries=0;
 241                 for(ce=0;ce<entries;++ce) {
 242                     flag=get_bits1(gb);
 243                     if (flag) {
 244                         tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
 245                         ++used_entries;
 246                     }
 247                     else tmp_vlc_bits[ce]=0;
 248                 }
 249             } else {
 250                 AV_DEBUG(" not sparse \n");
 251
 252                 used_entries=entries;
 253                 for(ce=0;ce<entries;++ce) {
 254                     tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
 255                 }
 256             }
 257         } else {
 258             uint_fast16_t current_entry=0;
 259             uint_fast8_t current_length=get_bits(gb, 5)+1;
 260
 261             AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
 262
 263             used_entries=entries;
 264             for(;current_entry<used_entries;++current_length) {
 265                 uint_fast16_t i, number;
 266
 267                 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
 268
 269                 number=get_bits(gb, ilog(entries - current_entry));
 270
 271                 AV_DEBUG(" number: %d \n", number);
 272
 273                 for(i=current_entry;i<number+current_entry;++i) {
 274                     if (i<used_entries) tmp_vlc_bits[i]=current_length;
 275                 }
 276
 277                 current_entry+=number;
 278             }
 279             if (current_entry>used_entries) {
 280                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
 281                 goto error;
 282             }
 283         }
 284
 285         codebook_setup->lookup_type=get_bits(gb, 4);
 286
 287         AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
 288
 289 // If the codebook is used for (inverse) VQ, calculate codevectors.
 290
 291         if (codebook_setup->lookup_type==1) {
 292             uint_fast16_t i, j, k;
 293             uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
 294             uint_fast16_t codebook_multiplicands[codebook_lookup_values];
 295
 296             float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
 297             float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
 298             uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
 299             uint_fast8_t codebook_sequence_p=get_bits1(gb);
 300
 301             AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
 302             AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
 303
 304             for(i=0;i<codebook_lookup_values;++i) {
 305                 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
 306
 307                 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
 308                 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
 309             }
 310
 311 // Weed out unused vlcs and build codevector vector
 312             codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
 313             for(j=0, i=0;i<entries;++i) {
 314                 uint_fast8_t dim=codebook_setup->dimensions;
 315
 316                 if (tmp_vlc_bits[i]) {
 317                     float last=0.0;
 318                     uint_fast32_t lookup_offset=i;
 319
 320 #ifdef V_DEBUG
 321                     av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
 322 #endif
 323
 324                     for(k=0;k<dim;++k) {
 325                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
 326                         codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
 327                         if (codebook_sequence_p) {
 328                             last=codebook_setup->codevectors[j*dim+k];
 329                         }
 330                         lookup_offset/=codebook_lookup_values;
 331                     }
 332                     tmp_vlc_bits[j]=tmp_vlc_bits[i];
 333
 334 #ifdef V_DEBUG
 335                     av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
 336                     for(k=0;k<dim;++k) {
 337                         av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
 338                     }
 339                     av_log(vc->avccontext, AV_LOG_INFO, "\n");
 340 #endif
 341
 342                     ++j;
 343                 }
 344             }
 345             if (j!=used_entries) {
 346                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
 347                 goto error;
 348             }
 349             entries=used_entries;
 350         }
 351         else if (codebook_setup->lookup_type>=2) {
 352             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
 353             goto error;
 354         }
 355
 356 // Initialize VLC table
 357         if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
 358             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
 359             goto error;
 360         }
 361         codebook_setup->maxdepth=0;
 362         for(t=0;t<entries;++t)
 363             if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
 364
 365         if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
 366         else                                       codebook_setup->nb_bits=V_NB_BITS;
 367
 368         codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
 369
 370         if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
 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->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
 763     vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
 764     vc->saved_start=0;
 765
 766     ff_mdct_init(&vc->mdct0, bl0, 1);
 767     ff_mdct_init(&vc->mdct1, bl1, 1);
 768
 769     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 ",
 770             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
 771
 772 /*
 773     BLK=vc->blocksize_0;
 774     for(i=0;i<BLK/2;++i) {
 775         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)));
 776     }
 777 */
 778
 779     return 0;
 780 }
 781
 782 // Process the extradata using the functions above (identification header, setup header)
 783
 784 static int vorbis_decode_init(AVCodecContext *avccontext) {
 785     vorbis_context *vc = avccontext->priv_data ;
 786     uint8_t *headers = avccontext->extradata;
 787     int headers_len=avccontext->extradata_size;
 788     uint8_t *header_start[3];
 789     int header_len[3];
 790     GetBitContext *gb = &(vc->gb);
 791     int i, j, hdr_type;
 792
 793     vc->avccontext = avccontext;
 794
 795     if (!headers_len) {
 796         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 797         return -1;
 798     }
 799
 800     if(headers[0] == 0 && headers[1] == 30) {
 801         for(i = 0; i < 3; i++){
 802             header_len[i] = *headers++ << 8;
 803             header_len[i] += *headers++;
 804             header_start[i] = headers;
 805             headers += header_len[i];
 806         }
 807     } else if(headers[0] == 2) {
 808         for(j=1,i=0;i<2;++i, ++j) {
 809             header_len[i]=0;
 810             while(j<headers_len && headers[j]==0xff) {
 811                 header_len[i]+=0xff;
 812                 ++j;
 813             }
 814             if (j>=headers_len) {
 815                 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 816                 return -1;
 817             }
 818             header_len[i]+=headers[j];
 819         }
 820         header_len[2]=headers_len-header_len[0]-header_len[1]-j;
 821         headers+=j;
 822         header_start[0] = headers;
 823         header_start[1] = header_start[0] + header_len[0];
 824         header_start[2] = header_start[1] + header_len[1];
 825     } else {
 826         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
 827         return -1;
 828     }
 829
 830     init_get_bits(gb, header_start[0], header_len[0]*8);
 831     hdr_type=get_bits(gb, 8);
 832     if (hdr_type!=1) {
 833         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
 834         return -1;
 835     }
 836     if (vorbis_parse_id_hdr(vc)) {
 837         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
 838         vorbis_free(vc);
 839         return -1;
 840     }
 841
 842     init_get_bits(gb, header_start[2], header_len[2]*8);
 843     hdr_type=get_bits(gb, 8);
 844     if (hdr_type!=5) {
 845         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
 846         return -1;
 847     }
 848     if (vorbis_parse_setup_hdr(vc)) {
 849         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
 850         vorbis_free(vc);
 851         return -1;
 852     }
 853
 854     avccontext->channels = vc->audio_channels;
 855     avccontext->sample_rate = vc->audio_samplerate;
 856
 857     return 0 ;
 858 }
 859
 860 // Decode audiopackets -------------------------------------------------
 861
 862 // Read and decode floor (type 1 only)
 863
 864 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {
 865     GetBitContext *gb=&vc->gb;
 866     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
 867     uint_fast16_t range=range_v[vf->multiplier-1];
 868     uint_fast16_t floor1_Y[vf->x_list_dim];
 869     uint_fast16_t floor1_Y_final[vf->x_list_dim];
 870     uint_fast8_t floor1_flag[vf->x_list_dim];
 871     uint_fast8_t class_;
 872     uint_fast8_t cdim;
 873     uint_fast8_t cbits;
 874     uint_fast8_t csub;
 875     uint_fast8_t cval;
 876     int_fast16_t book;
 877     uint_fast16_t offset;
 878     uint_fast16_t i,j;
 879     uint_fast16_t *floor_x_sort=vf->x_list_order;
 880     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
 881     int_fast16_t dy, err;
 882     uint_fast16_t lx,hx, ly, hy=0;
 883
 884
 885     if (!get_bits1(gb)) return 1; // silence
 886
 887 // Read values (or differences) for the floor's points
 888
 889     floor1_Y[0]=get_bits(gb, ilog(range-1));
 890     floor1_Y[1]=get_bits(gb, ilog(range-1));
 891
 892     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
 893
 894     offset=2;
 895     for(i=0;i<vf->partitions;++i) {
 896         class_=vf->partition_class[i];
 897         cdim=vf->class_dimensions[class_];
 898         cbits=vf->class_subclasses[class_];
 899         csub=(1<<cbits)-1;
 900         cval=0;
 901
 902         AV_DEBUG("Cbits %d \n", cbits);
 903
 904         if (cbits) { // this reads all subclasses for this partition's class
 905             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
 906             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
 907         }
 908
 909         for(j=0;j<cdim;++j) {
 910             book=vf->subclass_books[class_][cval & csub];
 911
 912             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
 913
 914             cval=cval>>cbits;
 915             if (book>0) {
 916                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
 917                 vc->codebooks[book].nb_bits, 3);
 918             } else {
 919                 floor1_Y[offset+j]=0;
 920             }
 921
 922             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
 923         }
 924         offset+=cdim;
 925     }
 926
 927 // Amplitude calculation from the differences
 928
 929     floor1_flag[0]=1;
 930     floor1_flag[1]=1;
 931     floor1_Y_final[0]=floor1_Y[0];
 932     floor1_Y_final[1]=floor1_Y[1];
 933
 934     for(i=2;i<vf->x_list_dim;++i) {
 935         uint_fast16_t val, highroom, lowroom, room;
 936         uint_fast16_t high_neigh_offs;
 937         uint_fast16_t low_neigh_offs;
 938
 939         low_neigh_offs=vf->low_neighbour[i];
 940         high_neigh_offs=vf->high_neighbour[i];
 941         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
 942         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
 943         ady= ABS(dy);
 944         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
 945         off=err/adx;
 946         if (dy<0) {
 947             predicted=floor1_Y_final[low_neigh_offs]-off;
 948         } else {
 949             predicted=floor1_Y_final[low_neigh_offs]+off;
 950         } // render_point end
 951
 952         val=floor1_Y[i];
 953         highroom=range-predicted;
 954         lowroom=predicted;
 955         if (highroom < lowroom) {
 956             room=highroom*2;
 957         } else {
 958             room=lowroom*2;   // SPEC mispelling
 959         }
 960         if (val) {
 961             floor1_flag[low_neigh_offs]=1;
 962             floor1_flag[high_neigh_offs]=1;
 963             floor1_flag[i]=1;
 964             if (val>=room) {
 965                 if (highroom > lowroom) {
 966                     floor1_Y_final[i]=val-lowroom+predicted;
 967                 } else {
 968                     floor1_Y_final[i]=predicted-val+highroom-1;
 969                 }
 970             } else {
 971                 if (val & 1) {
 972                     floor1_Y_final[i]=predicted-(val+1)/2;
 973                 } else {
 974                     floor1_Y_final[i]=predicted+val/2;
 975                 }
 976             }
 977         } else {
 978             floor1_flag[i]=0;
 979             floor1_Y_final[i]=predicted;
 980         }
 981
 982         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
 983     }
 984
 985 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
 986
 987     hx=0;
 988     lx=0;
 989     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
 990
 991     vec[0]=floor1_inverse_db_table[ly];
 992
 993     for(i=1;i<vf->x_list_dim;++i) {
 994         AV_DEBUG(" Looking at post %d \n", i);
 995
 996         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
 997             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
 998
 999             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1000             hx=vf->x_list[floor_x_sort[i]];
1001
1002             dy=hy-ly;
1003             adx=hx-lx;
1004             ady= (dy<0) ? -dy:dy;//ABS(dy);
1005             base=dy/adx;
1006
1007             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1008
1009             x=lx;
1010             y=ly;
1011             err=0;
1012             if (dy<0) {
1013                 sy=base-1;
1014             } else {
1015                 sy=base+1;
1016             }
1017             ady=ady-(base<0 ? -base : base)*adx;
1018             vec[x]=floor1_inverse_db_table[y];
1019
1020             AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1021
1022             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1023                 err+=ady;
1024                 if (err>=adx) {
1025                     err-=adx;
1026                     y+=sy;
1027                 } else {
1028                     y+=base;
1029                 }
1030                 vec[x]=floor1_inverse_db_table[y];
1031
1032                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1033             }
1034
1035 /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1036                 dy=hy-ly;
1037                 adx=hx-lx;
1038                 ady= dy<0 ? -dy : dy;
1039                 err=ady*j;
1040                 off=err/adx;
1041                 if (dy<0) {
1042                     predicted=ly-off;
1043                 } else {
1044                     predicted=ly+off;
1045                 }
1046                 if (lx+j < vf->x_list[1]) {
1047                     vec[lx+j]=floor1_inverse_db_table[predicted];
1048                 }
1049             }*/
1050
1051             lx=hx;
1052             ly=hy;
1053         }
1054     }
1055
1056     if (hx<vf->x_list[1]) {
1057         for(i=hx;i<vf->x_list[1];++i) {
1058             vec[i]=floor1_inverse_db_table[hy];
1059         }
1060     }
1061
1062     AV_DEBUG(" Floor decoded\n");
1063
1064     return 0;
1065 }
1066
1067 // Read and decode residue
1068
1069 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) {
1070     GetBitContext *gb=&vc->gb;
1071     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1072     uint_fast16_t n_to_read=vr->end-vr->begin;
1073     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1074     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1075     uint_fast8_t pass;
1076     uint_fast8_t ch_used;
1077     uint_fast8_t i,j,l;
1078     uint_fast16_t k;
1079
1080     if (vr->type==2) {
1081         for(j=1;j<ch;++j) {
1082                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1083         }
1084         if (do_not_decode[0]) return 0;
1085         ch_used=1;
1086     } else {
1087         ch_used=ch;
1088     }
1089
1090     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1091
1092     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1093         uint_fast16_t voffset;
1094         uint_fast16_t partition_count;
1095         uint_fast16_t j_times_ptns_to_read;
1096
1097         voffset=vr->begin;
1098         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1099             if (!pass) {
1100                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1101                     if (!do_not_decode[j]) {
1102                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1103                         vc->codebooks[vr->classbook].nb_bits, 3);
1104
1105                         AV_DEBUG("Classword: %d \n", temp);
1106
1107                         assert(vr->classifications > 1 && vr->classifications<256 && temp<=65536); //needed for inverse[]
1108                         for(i=0;i<c_p_c;++i) {
1109                             uint_fast32_t temp2;
1110
1111                             temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
1112                             classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1113                             temp=temp2;
1114                         }
1115                     }
1116                     j_times_ptns_to_read+=ptns_to_read;
1117                 }
1118             }
1119             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1120                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1121                     uint_fast16_t voffs;
1122
1123                     if (!do_not_decode[j]) {
1124                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1125                         int_fast16_t vqbook=vr->books[vqclass][pass];
1126
1127                         if (vqbook>=0) {
1128                             uint_fast16_t coffs;
1129                             uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1130                             vorbis_codebook codebook= vc->codebooks[vqbook];
1131
1132                             if (vr->type==0) {
1133
1134                                 voffs=voffset+j*vlen;
1135                                 for(k=0;k<step;++k) {
1136                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1137                                     for(l=0;l<codebook.dimensions;++l) {
1138                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1139                                     }
1140                                 }
1141                             }
1142                             else if (vr->type==1) {
1143                                 voffs=voffset+j*vlen;
1144                                 for(k=0;k<step;++k) {
1145                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1146                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {
1147                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1148
1149                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1150                                     }
1151                                 }
1152                             }
1153                             else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized
1154                                 voffs=voffset>>1;
1155
1156                                 for(k=0;k<step;++k) {
1157                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1158                                     for(l=0;l<codebook.dimensions;l+=2, voffs++) {
1159                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1160                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1161
1162                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
1163                                     }
1164                                 }
1165
1166                             }
1167                             else if (vr->type==2) {
1168                                 voffs=voffset;
1169
1170                                 for(k=0;k<step;++k) {
1171                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1172                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {
1173                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1174
1175                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
1176                                     }
1177                                 }
1178                             } else {
1179                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1180                                 return 1;
1181                             }
1182                         }
1183                     }
1184                     j_times_ptns_to_read+=ptns_to_read;
1185                 }
1186                 ++partition_count;
1187                 voffset+=vr->partition_size;
1188             }
1189         }
1190     }
1191     return 0;
1192 }
1193
1194 // Decode the audio packet using the functions above
1195 #define BIAS 385
1196
1197 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1198     GetBitContext *gb=&vc->gb;
1199
1200     uint_fast8_t previous_window=0,next_window=0;
1201     uint_fast8_t mode_number;
1202     uint_fast16_t blocksize;
1203     int_fast32_t i,j;
1204     uint_fast8_t no_residue[vc->audio_channels];
1205     uint_fast8_t do_not_decode[vc->audio_channels];
1206     vorbis_mapping *mapping;
1207     float *ch_res_ptr=vc->channel_residues;
1208     float *ch_floor_ptr=vc->channel_floors;
1209     uint_fast8_t res_chan[vc->audio_channels];
1210     uint_fast8_t res_num=0;
1211     int_fast16_t retlen=0;
1212     uint_fast16_t saved_start=0;
1213
1214     if (get_bits1(gb)) {
1215         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1216         return -1; // packet type not audio
1217     }
1218
1219     if (vc->mode_count==1) {
1220         mode_number=0;
1221     } else {
1222         mode_number=get_bits(gb, ilog(vc->mode_count-1));
1223     }
1224     mapping=&vc->mappings[vc->modes[mode_number].mapping];
1225
1226     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1227
1228     if (vc->modes[mode_number].blockflag) {
1229         previous_window=get_bits1(gb);
1230         next_window=get_bits1(gb);
1231     }
1232
1233     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1234     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1235     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1236
1237 // Decode floor(1)
1238
1239     for(i=0;i<vc->audio_channels;++i) {
1240         vorbis_floor *floor;
1241         if (mapping->submaps>1) {
1242             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1243         } else {
1244             floor=&vc->floors[mapping->submap_floor[0]];
1245         }
1246
1247         no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);
1248         ch_floor_ptr+=blocksize/2;
1249     }
1250
1251 // Nonzero vector propagate
1252
1253     for(i=mapping->coupling_steps-1;i>=0;--i) {
1254         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1255             no_residue[mapping->magnitude[i]]=0;
1256             no_residue[mapping->angle[i]]=0;
1257         }
1258     }
1259
1260 // Decode residue
1261
1262     for(i=0;i<mapping->submaps;++i) {
1263         vorbis_residue *residue;
1264         uint_fast8_t ch=0;
1265
1266         for(j=0;j<vc->audio_channels;++j) {
1267             if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1268                 res_chan[j]=res_num;
1269                 if (no_residue[j]) {
1270                     do_not_decode[ch]=1;
1271                 } else {
1272                     do_not_decode[ch]=0;
1273                 }
1274                 ++ch;
1275                 ++res_num;
1276             }
1277         }
1278         residue=&vc->residues[mapping->submap_residue[i]];
1279         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1280
1281         ch_res_ptr+=ch*blocksize/2;
1282     }
1283
1284 // Inverse coupling
1285
1286     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1287         float *mag, *ang;
1288
1289         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1290         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1291         for(j=0;j<blocksize/2;++j) {
1292             float temp;
1293             if (mag[j]>0.0) {
1294                 if (ang[j]>0.0) {
1295                     ang[j]=mag[j]-ang[j];
1296                 } else {
1297                     temp=ang[j];
1298                     ang[j]=mag[j];
1299                     mag[j]+=temp;
1300                 }
1301             } else {
1302                 if (ang[j]>0.0) {
1303                     ang[j]+=mag[j];
1304                 } else {
1305                     temp=ang[j];
1306                     ang[j]=mag[j];
1307                     mag[j]-=temp;
1308                 }
1309             }
1310         }
1311     }
1312
1313 // Dotproduct
1314
1315     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1316         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1317
1318         for(i=0;i<blocksize/2;++i) {
1319             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1320         }
1321     }
1322
1323 // MDCT, overlap/add, save data for next overlapping  FPMATH
1324
1325     for(j=0;j<vc->audio_channels;++j) {
1326         uint_fast8_t step=vc->audio_channels;
1327         uint_fast16_t k;
1328         float *saved=vc->saved+j*vc->blocksize_1/2;
1329         float *ret=vc->ret;
1330         const float *lwin=vc->lwin;
1331         const float *swin=vc->swin;
1332         float *buf=vc->buf;
1333         float *buf_tmp=vc->buf_tmp;
1334
1335         ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1336
1337         saved_start=vc->saved_start;
1338
1339         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1340
1341         if (vc->modes[mode_number].blockflag) {
1342             // -- overlap/add
1343             if (previous_window) {
1344                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1345                     ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
1346                 }
1347                 retlen=vc->blocksize_1/2;
1348             } else {
1349                 buf += (vc->blocksize_1-vc->blocksize_0)/4;
1350                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1351                     ret[k]=saved[i]+buf[i]*swin[i]+BIAS;
1352                 }
1353                 buf += vc->blocksize_0/2;
1354                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1355                     ret[k]=buf[i]+BIAS;
1356                 }
1357                 buf=vc->buf;
1358                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1359             }
1360             // -- save
1361             if (next_window) {
1362                 buf += vc->blocksize_1/2;
1363                 lwin += vc->blocksize_1/2-1;
1364                 for(i=0;i<vc->blocksize_1/2;++i) {
1365                     saved[i]=buf[i]*lwin[-i];
1366                 }
1367                 saved_start=0;
1368             } else {
1369                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1370                 buf += vc->blocksize_1/2;
1371                 for(i=0;i<saved_start;++i) {
1372                     saved[i]=buf[i];
1373                 }
1374                 swin += vc->blocksize_0/2-1;
1375                 for(i=0;i<vc->blocksize_0/2;++i) {
1376                     saved[saved_start+i]=buf[saved_start+i]*swin[-i];
1377                 }
1378             }
1379         } else {
1380             // --overlap/add
1381             for(k=j, i=0;i<saved_start;++i, k+=step) {
1382                 ret[k]=saved[i]+BIAS;
1383             }
1384             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1385                 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
1386             }
1387             retlen=saved_start+vc->blocksize_0/2;
1388             // -- save
1389             buf += vc->blocksize_0/2;
1390             swin += vc->blocksize_0/2-1;
1391             for(i=0;i<vc->blocksize_0/2;++i) {
1392                 saved[i]=buf[i]*swin[-i];
1393             }
1394             saved_start=0;
1395         }
1396     }
1397     vc->saved_start=saved_start;
1398
1399     return retlen*vc->audio_channels;
1400 }
1401
1402 // Return the decoded audio packet through the standard api
1403
1404 static int vorbis_decode_frame(AVCodecContext *avccontext,
1405                         void *data, int *data_size,
1406                         uint8_t *buf, int buf_size)
1407 {
1408     vorbis_context *vc = avccontext->priv_data ;
1409     GetBitContext *gb = &(vc->gb);
1410
1411     int_fast16_t i, len;
1412
1413     if(!buf_size){
1414         return 0;
1415     }
1416
1417     AV_DEBUG("packet length %d \n", buf_size);
1418
1419     init_get_bits(gb, buf, buf_size*8);
1420
1421     len=vorbis_parse_audio_packet(vc);
1422
1423     if (len<=0) {
1424         *data_size=0;
1425         return buf_size;
1426     }
1427
1428     if (!vc->first_frame) {
1429         vc->first_frame=1;
1430         *data_size=0;
1431         return buf_size ;
1432     }
1433
1434     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1435
1436     for(i=0;i<len;++i) {
1437         int_fast32_t tmp= ((int32_t*)vc->ret)[i];
1438         if(tmp & 0xf0000){
1439 //            tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
1440             if(tmp > 0x43c0ffff) tmp= 0xFFFF;
1441             else                 tmp= 0;
1442         }
1443         ((int16_t*)data)[i]=tmp - 0x8000;
1444     }
1445
1446     *data_size=len*2;
1447
1448     return buf_size ;
1449 }
1450
1451 // Close decoder
1452
1453 static int vorbis_decode_close(AVCodecContext *avccontext) {
1454     vorbis_context *vc = avccontext->priv_data;
1455
1456     vorbis_free(vc);
1457
1458     return 0 ;
1459 }
1460
1461 AVCodec vorbis_decoder = {
1462     "vorbis",
1463     CODEC_TYPE_AUDIO,
1464     CODEC_ID_VORBIS,
1465     sizeof(vorbis_context),
1466     vorbis_decode_init,
1467     NULL,
1468     vorbis_decode_close,
1469     vorbis_decode_frame,
1470 };
1471