media/libvorbis/lib/vorbis_res0.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: residue backend 0, 1 and 2 implementation
  14  last mod: $Id: res0.c 13293 2007-07-24 00:09:47Z xiphmont $
  15
  16  ********************************************************************/
  17
  18 /* Slow, slow, slow, simpleminded and did I mention it was slow?  The
  19    encode/decode loops are coded for clarity and performance is not
  20    yet even a nagging little idea lurking in the shadows.  Oh and BTW,
  21    it's slow. */
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <math.h>
  26 #include <ogg/ogg.h>
  27 #include "vorbis/codec.h"
  28 #include "codec_internal.h"
  29 #include "registry.h"
  30 #include "codebook.h"
  31 #include "misc.h"
  32 #include "os.h"
  33
  34 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
  35 #include <stdio.h>
  36 #endif
  37
  38 typedef struct {
  39   vorbis_info_residue0 *info;
  40
  41   int         parts;
  42   int         stages;
  43   codebook   *fullbooks;
  44   codebook   *phrasebook;
  45   codebook ***partbooks;
  46
  47   int         partvals;
  48   int       **decodemap;
  49
  50   long      postbits;
  51   long      phrasebits;
  52   long      frames;
  53
  54 #if defined(TRAIN_RES) || defined(TRAIN_RESAUX)
  55   int        train_seq;
  56   long      *training_data[8][64];
  57   float      training_max[8][64];
  58   float      training_min[8][64];
  59   float     tmin;
  60   float     tmax;
  61 #endif
  62
  63 } vorbis_look_residue0;
  64
  65 void res0_free_info(vorbis_info_residue *i){
  66   vorbis_info_residue0 *info=(vorbis_info_residue0 *)i;
  67   if(info){
  68     memset(info,0,sizeof(*info));
  69     _ogg_free(info);
  70   }
  71 }
  72
  73 void res0_free_look(vorbis_look_residue *i){
  74   int j;
  75   if(i){
  76
  77     vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
  78
  79 #ifdef TRAIN_RES
  80     {
  81       int j,k,l;
  82       for(j=0;j<look->parts;j++){
  83         /*fprintf(stderr,"partition %d: ",j);*/
  84         for(k=0;k<8;k++)
  85           if(look->training_data[k][j]){
  86             char buffer[80];
  87             FILE *of;
  88             codebook *statebook=look->partbooks[j][k];
  89
  90             /* long and short into the same bucket by current convention */
  91             sprintf(buffer,"res_part%d_pass%d.vqd",j,k);
  92             of=fopen(buffer,"a");
  93
  94             for(l=0;l<statebook->entries;l++)
  95               fprintf(of,"%d:%ld\n",l,look->training_data[k][j][l]);
  96
  97             fclose(of);
  98
  99             /*fprintf(stderr,"%d(%.2f|%.2f) ",k,
 100               look->training_min[k][j],look->training_max[k][j]);*/
 101
 102             _ogg_free(look->training_data[k][j]);
 103             look->training_data[k][j]=NULL;
 104           }
 105         /*fprintf(stderr,"\n");*/
 106       }
 107     }
 108     fprintf(stderr,"min/max residue: %g::%g\n",look->tmin,look->tmax);
 109
 110     /*fprintf(stderr,"residue bit usage %f:%f (%f total)\n",
 111             (float)look->phrasebits/look->frames,
 112             (float)look->postbits/look->frames,
 113             (float)(look->postbits+look->phrasebits)/look->frames);*/
 114 #endif
 115
 116
 117     /*vorbis_info_residue0 *info=look->info;
 118
 119     fprintf(stderr,
 120             "%ld frames encoded in %ld phrasebits and %ld residue bits "
 121             "(%g/frame) \n",look->frames,look->phrasebits,
 122             look->resbitsflat,
 123             (look->phrasebits+look->resbitsflat)/(float)look->frames);
 124
 125     for(j=0;j<look->parts;j++){
 126       long acc=0;
 127       fprintf(stderr,"\t[%d] == ",j);
 128       for(k=0;k<look->stages;k++)
 129         if((info->secondstages[j]>>k)&1){
 130           fprintf(stderr,"%ld,",look->resbits[j][k]);
 131           acc+=look->resbits[j][k];
 132         }
 133
 134       fprintf(stderr,":: (%ld vals) %1.2fbits/sample\n",look->resvals[j],
 135               acc?(float)acc/(look->resvals[j]*info->grouping):0);
 136     }
 137     fprintf(stderr,"\n");*/
 138
 139     for(j=0;j<look->parts;j++)
 140       if(look->partbooks[j])_ogg_free(look->partbooks[j]);
 141     _ogg_free(look->partbooks);
 142     for(j=0;j<look->partvals;j++)
 143       _ogg_free(look->decodemap[j]);
 144     _ogg_free(look->decodemap);
 145
 146     memset(look,0,sizeof(*look));
 147     _ogg_free(look);
 148   }
 149 }
 150
 151 static int ilog(unsigned int v){
 152   int ret=0;
 153   while(v){
 154     ret++;
 155     v>>=1;
 156   }
 157   return(ret);
 158 }
 159
 160 static int icount(unsigned int v){
 161   int ret=0;
 162   while(v){
 163     ret+=v&1;
 164     v>>=1;
 165   }
 166   return(ret);
 167 }
 168
 169
 170 void res0_pack(vorbis_info_residue *vr,oggpack_buffer *opb){
 171   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
 172   int j,acc=0;
 173   oggpack_write(opb,info->begin,24);
 174   oggpack_write(opb,info->end,24);
 175
 176   oggpack_write(opb,info->grouping-1,24);  /* residue vectors to group and
 177                                              code with a partitioned book */
 178   oggpack_write(opb,info->partitions-1,6); /* possible partition choices */
 179   oggpack_write(opb,info->groupbook,8);  /* group huffman book */
 180
 181   /* secondstages is a bitmask; as encoding progresses pass by pass, a
 182      bitmask of one indicates this partition class has bits to write
 183      this pass */
 184   for(j=0;j<info->partitions;j++){
 185     if(ilog(info->secondstages[j])>3){
 186       /* yes, this is a minor hack due to not thinking ahead */
 187       oggpack_write(opb,info->secondstages[j],3);
 188       oggpack_write(opb,1,1);
 189       oggpack_write(opb,info->secondstages[j]>>3,5);
 190     }else
 191       oggpack_write(opb,info->secondstages[j],4); /* trailing zero */
 192     acc+=icount(info->secondstages[j]);
 193   }
 194   for(j=0;j<acc;j++)
 195     oggpack_write(opb,info->booklist[j],8);
 196
 197 }
 198
 199 /* vorbis_info is for range checking */
 200 vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
 201   int j,acc=0;
 202   vorbis_info_residue0 *info=_ogg_calloc(1,sizeof(*info));
 203   codec_setup_info     *ci=vi->codec_setup;
 204
 205   info->begin=oggpack_read(opb,24);
 206   info->end=oggpack_read(opb,24);
 207   info->grouping=oggpack_read(opb,24)+1;
 208   info->partitions=oggpack_read(opb,6)+1;
 209   info->groupbook=oggpack_read(opb,8);
 210
 211   for(j=0;j<info->partitions;j++){
 212     int cascade=oggpack_read(opb,3);
 213     if(oggpack_read(opb,1))
 214       cascade|=(oggpack_read(opb,5)<<3);
 215     info->secondstages[j]=cascade;
 216
 217     acc+=icount(cascade);
 218   }
 219   for(j=0;j<acc;j++)
 220     info->booklist[j]=oggpack_read(opb,8);
 221
 222   if(info->groupbook>=ci->books)goto errout;
 223   for(j=0;j<acc;j++)
 224     if(info->booklist[j]>=ci->books)goto errout;
 225
 226   return(info);
 227  errout:
 228   res0_free_info(info);
 229   return(NULL);
 230 }
 231
 232 vorbis_look_residue *res0_look(vorbis_dsp_state *vd,
 233                                vorbis_info_residue *vr){
 234   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
 235   vorbis_look_residue0 *look=_ogg_calloc(1,sizeof(*look));
 236   codec_setup_info     *ci=vd->vi->codec_setup;
 237
 238   int j,k,acc=0;
 239   int dim;
 240   int maxstage=0;
 241   look->info=info;
 242
 243   look->parts=info->partitions;
 244   look->fullbooks=ci->fullbooks;
 245   look->phrasebook=ci->fullbooks+info->groupbook;
 246   dim=look->phrasebook->dim;
 247
 248   look->partbooks=_ogg_calloc(look->parts,sizeof(*look->partbooks));
 249
 250   for(j=0;j<look->parts;j++){
 251     int stages=ilog(info->secondstages[j]);
 252     if(stages){
 253       if(stages>maxstage)maxstage=stages;
 254       look->partbooks[j]=_ogg_calloc(stages,sizeof(*look->partbooks[j]));
 255       for(k=0;k<stages;k++)
 256         if(info->secondstages[j]&(1<<k)){
 257           look->partbooks[j][k]=ci->fullbooks+info->booklist[acc++];
 258 #ifdef TRAIN_RES
 259           look->training_data[k][j]=_ogg_calloc(look->partbooks[j][k]->entries,
 260                                            sizeof(***look->training_data));
 261 #endif
 262         }
 263     }
 264   }
 265
 266   look->partvals=rint(pow((float)look->parts,(float)dim));
 267   look->stages=maxstage;
 268   look->decodemap=_ogg_malloc(look->partvals*sizeof(*look->decodemap));
 269   for(j=0;j<look->partvals;j++){
 270     long val=j;
 271     long mult=look->partvals/look->parts;
 272     look->decodemap[j]=_ogg_malloc(dim*sizeof(*look->decodemap[j]));
 273     for(k=0;k<dim;k++){
 274       long deco=val/mult;
 275       val-=deco*mult;
 276       mult/=look->parts;
 277       look->decodemap[j][k]=deco;
 278     }
 279   }
 280 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
 281   {
 282     static int train_seq=0;
 283     look->train_seq=train_seq++;
 284   }
 285 #endif
 286   return(look);
 287 }
 288
 289 /* break an abstraction and copy some code for performance purposes */
 290 static int local_book_besterror(codebook *book,float *a){
 291   int dim=book->dim,i,k,o;
 292   int best=0;
 293   encode_aux_threshmatch *tt=book->c->thresh_tree;
 294
 295   /* find the quant val of each scalar */
 296   for(k=0,o=dim;k<dim;++k){
 297     float val=a[--o];
 298     i=tt->threshvals>>1;
 299
 300     if(val<tt->quantthresh[i]){
 301       if(val<tt->quantthresh[i-1]){
 302         for(--i;i>0;--i)
 303           if(val>=tt->quantthresh[i-1])
 304             break;
 305       }
 306     }else{
 307
 308       for(++i;i<tt->threshvals-1;++i)
 309         if(val<tt->quantthresh[i])break;
 310
 311     }
 312
 313     best=(best*tt->quantvals)+tt->quantmap[i];
 314   }
 315   /* regular lattices are easy :-) */
 316
 317   if(book->c->lengthlist[best]<=0){
 318     const static_codebook *c=book->c;
 319     int i,j;
 320     float bestf=0.f;
 321     float *e=book->valuelist;
 322     best=-1;
 323     for(i=0;i<book->entries;i++){
 324       if(c->lengthlist[i]>0){
 325         float this=0.f;
 326         for(j=0;j<dim;j++){
 327           float val=(e[j]-a[j]);
 328           this+=val*val;
 329         }
 330         if(best==-1 || this<bestf){
 331           bestf=this;
 332           best=i;
 333         }
 334       }
 335       e+=dim;
 336     }
 337   }
 338
 339   if(best>-1){
 340     float *ptr=book->valuelist+best*dim;
 341     for(i=0;i<dim;i++)
 342       *a++ -= *ptr++;
 343   }
 344
 345   return(best);
 346 }
 347
 348 static int _encodepart(oggpack_buffer *opb,float *vec, int n,
 349                        codebook *book,long *acc){
 350   int i,bits=0;
 351   int dim=book->dim;
 352   int step=n/dim;
 353
 354   for(i=0;i<step;i++){
 355     int entry=local_book_besterror(book,vec+i*dim);
 356
 357 #ifdef TRAIN_RES
 358     if(entry>0)
 359       acc[entry]++;
 360 #endif
 361
 362     bits+=vorbis_book_encode(book,entry,opb);
 363
 364   }
 365
 366   return(bits);
 367 }
 368
 369 static long **_01class(vorbis_block *vb,vorbis_look_residue *vl,
 370                        float **in,int ch){
 371   long i,j,k;
 372   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 373   vorbis_info_residue0 *info=look->info;
 374   vorbis_info           *vi=vb->vd->vi;
 375   codec_setup_info      *ci=vi->codec_setup;
 376
 377   /* move all this setup out later */
 378   int samples_per_partition=info->grouping;
 379   int possible_partitions=info->partitions;
 380   int n=info->end-info->begin;
 381
 382   int partvals=n/samples_per_partition;
 383   long **partword=_vorbis_block_alloc(vb,ch*sizeof(*partword));
 384   float scale=100./samples_per_partition;
 385
 386   /* we find the partition type for each partition of each
 387      channel.  We'll go back and do the interleaved encoding in a
 388      bit.  For now, clarity */
 389
 390   for(i=0;i<ch;i++){
 391     partword[i]=_vorbis_block_alloc(vb,n/samples_per_partition*sizeof(*partword[i]));
 392     memset(partword[i],0,n/samples_per_partition*sizeof(*partword[i]));
 393   }
 394
 395   for(i=0;i<partvals;i++){
 396     int offset=i*samples_per_partition+info->begin;
 397     for(j=0;j<ch;j++){
 398       float max=0.;
 399       float ent=0.;
 400       for(k=0;k<samples_per_partition;k++){
 401         if(fabs(in[j][offset+k])>max)max=fabs(in[j][offset+k]);
 402         ent+=fabs(rint(in[j][offset+k]));
 403       }
 404       ent*=scale;
 405
 406       for(k=0;k<possible_partitions-1;k++)
 407         if(max<=info->classmetric1[k] &&
 408            (info->classmetric2[k]<0 || (int)ent<info->classmetric2[k]))
 409           break;
 410
 411       partword[j][i]=k;
 412     }
 413   }
 414
 415 #ifdef TRAIN_RESAUX
 416   {
 417     FILE *of;
 418     char buffer[80];
 419
 420     for(i=0;i<ch;i++){
 421       sprintf(buffer,"resaux_%d.vqd",look->train_seq);
 422       of=fopen(buffer,"a");
 423       for(j=0;j<partvals;j++)
 424         fprintf(of,"%ld, ",partword[i][j]);
 425       fprintf(of,"\n");
 426       fclose(of);
 427     }
 428   }
 429 #endif
 430   look->frames++;
 431
 432   return(partword);
 433 }
 434
 435 /* designed for stereo or other modes where the partition size is an
 436    integer multiple of the number of channels encoded in the current
 437    submap */
 438 static long **_2class(vorbis_block *vb,vorbis_look_residue *vl,float **in,
 439                       int ch){
 440   long i,j,k,l;
 441   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 442   vorbis_info_residue0 *info=look->info;
 443
 444   /* move all this setup out later */
 445   int samples_per_partition=info->grouping;
 446   int possible_partitions=info->partitions;
 447   int n=info->end-info->begin;
 448
 449   int partvals=n/samples_per_partition;
 450   long **partword=_vorbis_block_alloc(vb,sizeof(*partword));
 451
 452 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
 453   FILE *of;
 454   char buffer[80];
 455 #endif
 456
 457   partword[0]=_vorbis_block_alloc(vb,n*ch/samples_per_partition*sizeof(*partword[0]));
 458   memset(partword[0],0,n*ch/samples_per_partition*sizeof(*partword[0]));
 459
 460   for(i=0,l=info->begin/ch;i<partvals;i++){
 461     float magmax=0.f;
 462     float angmax=0.f;
 463     for(j=0;j<samples_per_partition;j+=ch){
 464       if(fabs(in[0][l])>magmax)magmax=fabs(in[0][l]);
 465       for(k=1;k<ch;k++)
 466         if(fabs(in[k][l])>angmax)angmax=fabs(in[k][l]);
 467         l++;
 468     }
 469
 470     for(j=0;j<possible_partitions-1;j++)
 471       if(magmax<=info->classmetric1[j] &&
 472          angmax<=info->classmetric2[j])
 473         break;
 474
 475     partword[0][i]=j;
 476
 477   }
 478
 479 #ifdef TRAIN_RESAUX
 480   sprintf(buffer,"resaux_%d.vqd",look->train_seq);
 481   of=fopen(buffer,"a");
 482   for(i=0;i<partvals;i++)
 483     fprintf(of,"%ld, ",partword[0][i]);
 484   fprintf(of,"\n");
 485   fclose(of);
 486 #endif
 487
 488   look->frames++;
 489
 490   return(partword);
 491 }
 492
 493 static int _01forward(oggpack_buffer *opb,
 494                       vorbis_block *vb,vorbis_look_residue *vl,
 495                       float **in,int ch,
 496                       long **partword,
 497                       int (*encode)(oggpack_buffer *,float *,int,
 498                                     codebook *,long *)){
 499   long i,j,k,s;
 500   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 501   vorbis_info_residue0 *info=look->info;
 502
 503   vorbis_dsp_state      *vd=vb->vd;
 504
 505   /* move all this setup out later */
 506   int samples_per_partition=info->grouping;
 507   int possible_partitions=info->partitions;
 508   int partitions_per_word=look->phrasebook->dim;
 509   int n=info->end-info->begin;
 510
 511   int partvals=n/samples_per_partition;
 512   long resbits[128];
 513   long resvals[128];
 514
 515 #ifdef TRAIN_RES
 516   for(i=0;i<ch;i++)
 517     for(j=info->begin;j<end;j++){
 518       if(in[i][j]>look->tmax)look->tmax=in[i][j];
 519       if(in[i][j]<look->tmin)look->tmin=in[i][j];
 520     }
 521 #endif
 522
 523   memset(resbits,0,sizeof(resbits));
 524   memset(resvals,0,sizeof(resvals));
 525
 526   /* we code the partition words for each channel, then the residual
 527      words for a partition per channel until we've written all the
 528      residual words for that partition word.  Then write the next
 529      partition channel words... */
 530
 531   for(s=0;s<look->stages;s++){
 532
 533     for(i=0;i<partvals;){
 534
 535       /* first we encode a partition codeword for each channel */
 536       if(s==0){
 537         for(j=0;j<ch;j++){
 538           long val=partword[j][i];
 539           for(k=1;k<partitions_per_word;k++){
 540             val*=possible_partitions;
 541             if(i+k<partvals)
 542               val+=partword[j][i+k];
 543           }
 544
 545           /* training hack */
 546           if(val<look->phrasebook->entries)
 547             look->phrasebits+=vorbis_book_encode(look->phrasebook,val,opb);
 548 #if 0 /*def TRAIN_RES*/
 549           else
 550             fprintf(stderr,"!");
 551 #endif
 552
 553         }
 554       }
 555
 556       /* now we encode interleaved residual values for the partitions */
 557       for(k=0;k<partitions_per_word && i<partvals;k++,i++){
 558         long offset=i*samples_per_partition+info->begin;
 559
 560         for(j=0;j<ch;j++){
 561           if(s==0)resvals[partword[j][i]]+=samples_per_partition;
 562           if(info->secondstages[partword[j][i]]&(1<<s)){
 563             codebook *statebook=look->partbooks[partword[j][i]][s];
 564             if(statebook){
 565               int ret;
 566               long *accumulator=NULL;
 567
 568 #ifdef TRAIN_RES
 569               accumulator=look->training_data[s][partword[j][i]];
 570               {
 571                 int l;
 572                 float *samples=in[j]+offset;
 573                 for(l=0;l<samples_per_partition;l++){
 574                   if(samples[l]<look->training_min[s][partword[j][i]])
 575                     look->training_min[s][partword[j][i]]=samples[l];
 576                   if(samples[l]>look->training_max[s][partword[j][i]])
 577                     look->training_max[s][partword[j][i]]=samples[l];
 578                 }
 579               }
 580 #endif
 581
 582               ret=encode(opb,in[j]+offset,samples_per_partition,
 583                          statebook,accumulator);
 584
 585               look->postbits+=ret;
 586               resbits[partword[j][i]]+=ret;
 587             }
 588           }
 589         }
 590       }
 591     }
 592   }
 593
 594   /*{
 595     long total=0;
 596     long totalbits=0;
 597     fprintf(stderr,"%d :: ",vb->mode);
 598     for(k=0;k<possible_partitions;k++){
 599     fprintf(stderr,"%ld/%1.2g, ",resvals[k],(float)resbits[k]/resvals[k]);
 600     total+=resvals[k];
 601     totalbits+=resbits[k];
 602     }
 603
 604     fprintf(stderr,":: %ld:%1.2g\n",total,(double)totalbits/total);
 605     }*/
 606
 607   return(0);
 608 }
 609
 610 /* a truncated packet here just means 'stop working'; it's not an error */
 611 static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
 612                       float **in,int ch,
 613                       long (*decodepart)(codebook *, float *,
 614                                          oggpack_buffer *,int)){
 615
 616   long i,j,k,l,s;
 617   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 618   vorbis_info_residue0 *info=look->info;
 619
 620   /* move all this setup out later */
 621   int samples_per_partition=info->grouping;
 622   int partitions_per_word=look->phrasebook->dim;
 623   int max=vb->pcmend>>1;
 624   int end=(info->end<max?info->end:max);
 625   int n=end-info->begin;
 626
 627   if(n>0){
 628     int partvals=n/samples_per_partition;
 629     int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
 630     int ***partword=alloca(ch*sizeof(*partword));
 631
 632     for(j=0;j<ch;j++)
 633       partword[j]=_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));
 634
 635     for(s=0;s<look->stages;s++){
 636
 637       /* each loop decodes on partition codeword containing
 638          partitions_per_word partitions */
 639       for(i=0,l=0;i<partvals;l++){
 640         if(s==0){
 641           /* fetch the partition word for each channel */
 642           for(j=0;j<ch;j++){
 643             int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
 644
 645             if(temp==-1)goto eopbreak;
 646             partword[j][l]=look->decodemap[temp];
 647             if(partword[j][l]==NULL)goto errout;
 648           }
 649         }
 650
 651         /* now we decode residual values for the partitions */
 652         for(k=0;k<partitions_per_word && i<partvals;k++,i++)
 653           for(j=0;j<ch;j++){
 654             long offset=info->begin+i*samples_per_partition;
 655             if(info->secondstages[partword[j][l][k]]&(1<<s)){
 656               codebook *stagebook=look->partbooks[partword[j][l][k]][s];
 657               if(stagebook){
 658                 if(decodepart(stagebook,in[j]+offset,&vb->opb,
 659                               samples_per_partition)==-1)goto eopbreak;
 660               }
 661             }
 662           }
 663       }
 664     }
 665   }
 666  errout:
 667  eopbreak:
 668   return(0);
 669 }
 670
 671 #if 0
 672 /* residue 0 and 1 are just slight variants of one another. 0 is
 673    interleaved, 1 is not */
 674 long **res0_class(vorbis_block *vb,vorbis_look_residue *vl,
 675                   float **in,int *nonzero,int ch){
 676   /* we encode only the nonzero parts of a bundle */
 677   int i,used=0;
 678   for(i=0;i<ch;i++)
 679     if(nonzero[i])
 680       in[used++]=in[i];
 681   if(used)
 682     /*return(_01class(vb,vl,in,used,_interleaved_testhack));*/
 683     return(_01class(vb,vl,in,used));
 684   else
 685     return(0);
 686 }
 687
 688 int res0_forward(vorbis_block *vb,vorbis_look_residue *vl,
 689                  float **in,float **out,int *nonzero,int ch,
 690                  long **partword){
 691   /* we encode only the nonzero parts of a bundle */
 692   int i,j,used=0,n=vb->pcmend/2;
 693   for(i=0;i<ch;i++)
 694     if(nonzero[i]){
 695       if(out)
 696         for(j=0;j<n;j++)
 697           out[i][j]+=in[i][j];
 698       in[used++]=in[i];
 699     }
 700   if(used){
 701     int ret=_01forward(vb,vl,in,used,partword,
 702                       _interleaved_encodepart);
 703     if(out){
 704       used=0;
 705       for(i=0;i<ch;i++)
 706         if(nonzero[i]){
 707           for(j=0;j<n;j++)
 708             out[i][j]-=in[used][j];
 709           used++;
 710         }
 711     }
 712     return(ret);
 713   }else{
 714     return(0);
 715   }
 716 }
 717 #endif
 718
 719 int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 720                  float **in,int *nonzero,int ch){
 721   int i,used=0;
 722   for(i=0;i<ch;i++)
 723     if(nonzero[i])
 724       in[used++]=in[i];
 725   if(used)
 726     return(_01inverse(vb,vl,in,used,vorbis_book_decodevs_add));
 727   else
 728     return(0);
 729 }
 730
 731 int res1_forward(oggpack_buffer *opb,vorbis_block *vb,vorbis_look_residue *vl,
 732                  float **in,float **out,int *nonzero,int ch,
 733                  long **partword){
 734   int i,j,used=0,n=vb->pcmend/2;
 735   for(i=0;i<ch;i++)
 736     if(nonzero[i]){
 737       if(out)
 738         for(j=0;j<n;j++)
 739           out[i][j]+=in[i][j];
 740       in[used++]=in[i];
 741     }
 742
 743   if(used){
 744     int ret=_01forward(opb,vb,vl,in,used,partword,_encodepart);
 745     if(out){
 746       used=0;
 747       for(i=0;i<ch;i++)
 748         if(nonzero[i]){
 749           for(j=0;j<n;j++)
 750             out[i][j]-=in[used][j];
 751           used++;
 752         }
 753     }
 754     return(ret);
 755   }else{
 756     return(0);
 757   }
 758 }
 759
 760 long **res1_class(vorbis_block *vb,vorbis_look_residue *vl,
 761                   float **in,int *nonzero,int ch){
 762   int i,used=0;
 763   for(i=0;i<ch;i++)
 764     if(nonzero[i])
 765       in[used++]=in[i];
 766   if(used)
 767     return(_01class(vb,vl,in,used));
 768   else
 769     return(0);
 770 }
 771
 772 int res1_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 773                  float **in,int *nonzero,int ch){
 774   int i,used=0;
 775   for(i=0;i<ch;i++)
 776     if(nonzero[i])
 777       in[used++]=in[i];
 778   if(used)
 779     return(_01inverse(vb,vl,in,used,vorbis_book_decodev_add));
 780   else
 781     return(0);
 782 }
 783
 784 long **res2_class(vorbis_block *vb,vorbis_look_residue *vl,
 785                   float **in,int *nonzero,int ch){
 786   int i,used=0;
 787   for(i=0;i<ch;i++)
 788     if(nonzero[i])used++;
 789   if(used)
 790     return(_2class(vb,vl,in,ch));
 791   else
 792     return(0);
 793 }
 794
 795 /* res2 is slightly more different; all the channels are interleaved
 796    into a single vector and encoded. */
 797
 798 int res2_forward(oggpack_buffer *opb,
 799                  vorbis_block *vb,vorbis_look_residue *vl,
 800                  float **in,float **out,int *nonzero,int ch,
 801                  long **partword){
 802   long i,j,k,n=vb->pcmend/2,used=0;
 803
 804   /* don't duplicate the code; use a working vector hack for now and
 805      reshape ourselves into a single channel res1 */
 806   /* ugly; reallocs for each coupling pass :-( */
 807   float *work=_vorbis_block_alloc(vb,ch*n*sizeof(*work));
 808   for(i=0;i<ch;i++){
 809     float *pcm=in[i];
 810     if(nonzero[i])used++;
 811     for(j=0,k=i;j<n;j++,k+=ch)
 812       work[k]=pcm[j];
 813   }
 814
 815   if(used){
 816     int ret=_01forward(opb,vb,vl,&work,1,partword,_encodepart);
 817     /* update the sofar vector */
 818     if(out){
 819       for(i=0;i<ch;i++){
 820         float *pcm=in[i];
 821         float *sofar=out[i];
 822         for(j=0,k=i;j<n;j++,k+=ch)
 823           sofar[j]+=pcm[j]-work[k];
 824
 825       }
 826     }
 827     return(ret);
 828   }else{
 829     return(0);
 830   }
 831 }
 832
 833 /* duplicate code here as speed is somewhat more important */
 834 int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 835                  float **in,int *nonzero,int ch){
 836   long i,k,l,s;
 837   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 838   vorbis_info_residue0 *info=look->info;
 839
 840   /* move all this setup out later */
 841   int samples_per_partition=info->grouping;
 842   int partitions_per_word=look->phrasebook->dim;
 843   int max=(vb->pcmend*ch)>>1;
 844   int end=(info->end<max?info->end:max);
 845   int n=end-info->begin;
 846
 847   if(n>0){
 848     int partvals=n/samples_per_partition;
 849     int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
 850     int **partword=_vorbis_block_alloc(vb,partwords*sizeof(*partword));
 851
 852     for(i=0;i<ch;i++)if(nonzero[i])break;
 853     if(i==ch)return(0); /* no nonzero vectors */
 854
 855     for(s=0;s<look->stages;s++){
 856       for(i=0,l=0;i<partvals;l++){
 857
 858         if(s==0){
 859           /* fetch the partition word */
 860           int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
 861           if(temp==-1)goto eopbreak;
 862           partword[l]=look->decodemap[temp];
 863           if(partword[l]==NULL)goto errout;
 864         }
 865
 866         /* now we decode residual values for the partitions */
 867         for(k=0;k<partitions_per_word && i<partvals;k++,i++)
 868           if(info->secondstages[partword[l][k]]&(1<<s)){
 869             codebook *stagebook=look->partbooks[partword[l][k]][s];
 870
 871             if(stagebook){
 872               if(vorbis_book_decodevv_add(stagebook,in,
 873                                           i*samples_per_partition+info->begin,ch,
 874                                           &vb->opb,samples_per_partition)==-1)
 875                 goto eopbreak;
 876             }
 877           }
 878       }
 879     }
 880   }
 881  errout:
 882  eopbreak:
 883   return(0);
 884 }
 885
 886
 887 vorbis_func_residue residue0_exportbundle={
 888   NULL,
 889   &res0_unpack,
 890   &res0_look,
 891   &res0_free_info,
 892   &res0_free_look,
 893   NULL,
 894   NULL,
 895   &res0_inverse
 896 };
 897
 898 vorbis_func_residue residue1_exportbundle={
 899   &res0_pack,
 900   &res0_unpack,
 901   &res0_look,
 902   &res0_free_info,
 903   &res0_free_look,
 904   &res1_class,
 905   &res1_forward,
 906   &res1_inverse
 907 };
 908
 909 vorbis_func_residue residue2_exportbundle={
 910   &res0_pack,
 911   &res0_unpack,
 912   &res0_look,
 913   &res0_free_info,
 914   &res0_free_look,
 915   &res2_class,
 916   &res2_forward,
 917   &res2_inverse
 918 };
 919