lib/mapping0.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 1994-2001             *
   9  * by the XIPHOPHORUS Company http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: channel mapping 0 implementation
  14  last mod: $Id: mapping0.c,v 1.38 2001/12/12 09:45:25 xiphmont Exp $
  15
  16  ********************************************************************/
  17
  18 #include <stdlib.h>
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <math.h>
  22 #include <ogg/ogg.h>
  23 #include "vorbis/codec.h"
  24 #include "codec_internal.h"
  25 #include "codebook.h"
  26 #include "registry.h"
  27 #include "psy.h"
  28 #include "misc.h"
  29
  30 /* simplistic, wasteful way of doing this (unique lookup for each
  31    mode/submapping); there should be a central repository for
  32    identical lookups.  That will require minor work, so I'm putting it
  33    off as low priority.
  34
  35    Why a lookup for each backend in a given mode?  Because the
  36    blocksize is set by the mode, and low backend lookups may require
  37    parameters from other areas of the mode/mapping */
  38
  39 extern int analysis_noisy;
  40
  41 typedef struct {
  42   drft_lookup fft_look;
  43   vorbis_info_mode *mode;
  44   vorbis_info_mapping0 *map;
  45
  46   vorbis_look_time **time_look;
  47   vorbis_look_floor **floor_look;
  48
  49   vorbis_look_residue **residue_look;
  50   vorbis_look_psy *psy_look[2];
  51
  52   vorbis_func_time **time_func;
  53   vorbis_func_floor **floor_func;
  54   vorbis_func_residue **residue_func;
  55
  56   int ch;
  57   long lastframe; /* if a different mode is called, we need to
  58                      invalidate decay */
  59 } vorbis_look_mapping0;
  60
  61 static vorbis_info_mapping *mapping0_copy_info(vorbis_info_mapping *vm){
  62   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)vm;
  63   vorbis_info_mapping0 *ret=_ogg_malloc(sizeof(*ret));
  64   memcpy(ret,info,sizeof(*ret));
  65   return(ret);
  66 }
  67
  68 static void mapping0_free_info(vorbis_info_mapping *i){
  69   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)i;
  70   if(info){
  71     memset(info,0,sizeof(*info));
  72     _ogg_free(info);
  73   }
  74 }
  75
  76 static void mapping0_free_look(vorbis_look_mapping *look){
  77   int i;
  78   vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;
  79   if(l){
  80     drft_clear(&l->fft_look);
  81
  82     for(i=0;i<l->map->submaps;i++){
  83       l->time_func[i]->free_look(l->time_look[i]);
  84       l->floor_func[i]->free_look(l->floor_look[i]);
  85       l->residue_func[i]->free_look(l->residue_look[i]);
  86     }
  87     if(l->psy_look[1] && l->psy_look[1]!=l->psy_look[0]){
  88       _vp_psy_clear(l->psy_look[1]);
  89       _ogg_free(l->psy_look[1]);
  90     }
  91     if(l->psy_look[0]){
  92       _vp_psy_clear(l->psy_look[0]);
  93       _ogg_free(l->psy_look[0]);
  94     }
  95     _ogg_free(l->time_func);
  96     _ogg_free(l->floor_func);
  97     _ogg_free(l->residue_func);
  98     _ogg_free(l->time_look);
  99     _ogg_free(l->floor_look);
 100     _ogg_free(l->residue_look);
 101     memset(l,0,sizeof(*l));
 102     _ogg_free(l);
 103   }
 104 }
 105
 106 static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
 107                           vorbis_info_mapping *m){
 108   int i;
 109   vorbis_info          *vi=vd->vi;
 110   codec_setup_info     *ci=vi->codec_setup;
 111   vorbis_look_mapping0 *look=_ogg_calloc(1,sizeof(*look));
 112   vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
 113   look->mode=vm;
 114
 115   look->time_look=_ogg_calloc(info->submaps,sizeof(*look->time_look));
 116   look->floor_look=_ogg_calloc(info->submaps,sizeof(*look->floor_look));
 117
 118   look->residue_look=_ogg_calloc(info->submaps,sizeof(*look->residue_look));
 119
 120   look->time_func=_ogg_calloc(info->submaps,sizeof(*look->time_func));
 121   look->floor_func=_ogg_calloc(info->submaps,sizeof(*look->floor_func));
 122   look->residue_func=_ogg_calloc(info->submaps,sizeof(*look->residue_func));
 123
 124   for(i=0;i<info->submaps;i++){
 125     int timenum=info->timesubmap[i];
 126     int floornum=info->floorsubmap[i];
 127     int resnum=info->residuesubmap[i];
 128
 129     look->time_func[i]=_time_P[ci->time_type[timenum]];
 130     look->time_look[i]=look->time_func[i]->
 131       look(vd,vm,ci->time_param[timenum]);
 132     look->floor_func[i]=_floor_P[ci->floor_type[floornum]];
 133     look->floor_look[i]=look->floor_func[i]->
 134       look(vd,vm,ci->floor_param[floornum]);
 135     look->residue_func[i]=_residue_P[ci->residue_type[resnum]];
 136     look->residue_look[i]=look->residue_func[i]->
 137       look(vd,vm,ci->residue_param[resnum]);
 138
 139   }
 140   if(ci->psys && vd->analysisp){
 141     if(info->psy[0] != info->psy[1]){
 142
 143       int psynum=info->psy[0];
 144       look->psy_look[0]=_ogg_calloc(1,sizeof(*look->psy_look[0]));
 145       _vp_psy_init(look->psy_look[0],ci->psy_param[psynum],
 146                    &ci->psy_g_param,
 147                    ci->blocksizes[vm->blockflag]/2,vi->rate);
 148
 149       psynum=info->psy[1];
 150       look->psy_look[1]=_ogg_calloc(1,sizeof(*look->psy_look[1]));
 151       _vp_psy_init(look->psy_look[1],ci->psy_param[psynum],
 152                    &ci->psy_g_param,
 153                    ci->blocksizes[vm->blockflag]/2,vi->rate);
 154     }else{
 155
 156       int psynum=info->psy[0];
 157       look->psy_look[0]=_ogg_calloc(1,sizeof(*look->psy_look[0]));
 158       look->psy_look[1]=look->psy_look[0];
 159       _vp_psy_init(look->psy_look[0],ci->psy_param[psynum],
 160                    &ci->psy_g_param,
 161                    ci->blocksizes[vm->blockflag]/2,vi->rate);
 162
 163     }
 164   }
 165
 166   look->ch=vi->channels;
 167
 168   if(vd->analysisp)drft_init(&look->fft_look,ci->blocksizes[vm->blockflag]);
 169   return(look);
 170 }
 171
 172 static int ilog2(unsigned int v){
 173   int ret=0;
 174   while(v>1){
 175     ret++;
 176     v>>=1;
 177   }
 178   return(ret);
 179 }
 180
 181 static void mapping0_pack(vorbis_info *vi,vorbis_info_mapping *vm,
 182                           oggpack_buffer *opb){
 183   int i;
 184   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)vm;
 185
 186   /* another 'we meant to do it this way' hack...  up to beta 4, we
 187      packed 4 binary zeros here to signify one submapping in use.  We
 188      now redefine that to mean four bitflags that indicate use of
 189      deeper features; bit0:submappings, bit1:coupling,
 190      bit2,3:reserved. This is backward compatable with all actual uses
 191      of the beta code. */
 192
 193   if(info->submaps>1){
 194     oggpack_write(opb,1,1);
 195     oggpack_write(opb,info->submaps-1,4);
 196   }else
 197     oggpack_write(opb,0,1);
 198
 199   if(info->coupling_steps>0){
 200     oggpack_write(opb,1,1);
 201     oggpack_write(opb,info->coupling_steps-1,8);
 202
 203     for(i=0;i<info->coupling_steps;i++){
 204       oggpack_write(opb,info->coupling_mag[i],ilog2(vi->channels));
 205       oggpack_write(opb,info->coupling_ang[i],ilog2(vi->channels));
 206     }
 207   }else
 208     oggpack_write(opb,0,1);
 209
 210   oggpack_write(opb,0,2); /* 2,3:reserved */
 211
 212   /* we don't write the channel submappings if we only have one... */
 213   if(info->submaps>1){
 214     for(i=0;i<vi->channels;i++)
 215       oggpack_write(opb,info->chmuxlist[i],4);
 216   }
 217   for(i=0;i<info->submaps;i++){
 218     oggpack_write(opb,info->timesubmap[i],8);
 219     oggpack_write(opb,info->floorsubmap[i],8);
 220     oggpack_write(opb,info->residuesubmap[i],8);
 221   }
 222 }
 223
 224 /* also responsible for range checking */
 225 static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
 226   int i;
 227   vorbis_info_mapping0 *info=_ogg_calloc(1,sizeof(*info));
 228   codec_setup_info     *ci=vi->codec_setup;
 229   memset(info,0,sizeof(*info));
 230
 231   if(oggpack_read(opb,1))
 232     info->submaps=oggpack_read(opb,4)+1;
 233   else
 234     info->submaps=1;
 235
 236   if(oggpack_read(opb,1)){
 237     info->coupling_steps=oggpack_read(opb,8)+1;
 238
 239     for(i=0;i<info->coupling_steps;i++){
 240       int testM=info->coupling_mag[i]=oggpack_read(opb,ilog2(vi->channels));
 241       int testA=info->coupling_ang[i]=oggpack_read(opb,ilog2(vi->channels));
 242
 243       if(testM<0 ||
 244          testA<0 ||
 245          testM==testA ||
 246          testM>=vi->channels ||
 247          testA>=vi->channels) goto err_out;
 248     }
 249
 250   }
 251
 252   if(oggpack_read(opb,2)>0)goto err_out; /* 2,3:reserved */
 253
 254   if(info->submaps>1){
 255     for(i=0;i<vi->channels;i++){
 256       info->chmuxlist[i]=oggpack_read(opb,4);
 257       if(info->chmuxlist[i]>=info->submaps)goto err_out;
 258     }
 259   }
 260   for(i=0;i<info->submaps;i++){
 261     info->timesubmap[i]=oggpack_read(opb,8);
 262     if(info->timesubmap[i]>=ci->times)goto err_out;
 263     info->floorsubmap[i]=oggpack_read(opb,8);
 264     if(info->floorsubmap[i]>=ci->floors)goto err_out;
 265     info->residuesubmap[i]=oggpack_read(opb,8);
 266     if(info->residuesubmap[i]>=ci->residues)goto err_out;
 267   }
 268
 269   return info;
 270
 271  err_out:
 272   mapping0_free_info(info);
 273   return(NULL);
 274 }
 275
 276 #include "os.h"
 277 #include "lpc.h"
 278 #include "lsp.h"
 279 #include "envelope.h"
 280 #include "mdct.h"
 281 #include "psy.h"
 282 #include "scales.h"
 283
 284 /* no time mapping implementation for now */
 285 static long seq=0;
 286 static int mapping0_forward(vorbis_block *vb,vorbis_look_mapping *l){
 287   vorbis_dsp_state      *vd=vb->vd;
 288   vorbis_info           *vi=vd->vi;
 289   codec_setup_info      *ci=vi->codec_setup;
 290   backend_lookup_state  *b=vb->vd->backend_state;
 291   bitrate_manager_state *bm=&b->bms;
 292   vorbis_look_mapping0  *look=(vorbis_look_mapping0 *)l;
 293   vorbis_info_mapping0  *info=look->map;
 294   vorbis_info_mode      *mode=look->mode;
 295   vorbis_block_internal *vbi=(vorbis_block_internal *)vb->internal;
 296   int                    n=vb->pcmend;
 297   int i,j;
 298   float *window=b->window[vb->W][vb->lW][vb->nW][mode->windowtype];
 299   int   *nonzero=alloca(sizeof(*nonzero)*vi->channels);
 300
 301   float *work=_vorbis_block_alloc(vb,n*sizeof(*work));
 302
 303   float global_ampmax=vbi->ampmax;
 304   float *local_ampmax=alloca(sizeof(*local_ampmax)*vi->channels);
 305   int blocktype=vbi->blocktype;
 306
 307   /* we differentiate between short and long block types to help the
 308      masking engine; the window shapes also matter.
 309      impulse block (a short block in which an impulse occurs)
 310      padding block (a short block that pads between a transitional
 311           long block and an impulse block, or vice versa)
 312      transition block (the wqeird one; a long block with the transition
 313           window; affects bass/midrange response and that must be
 314           accounted for in masking)
 315      long block (run of the mill long block)
 316   */
 317
 318   if(seq%10==0)fprintf(stderr,"%d",seq);
 319   if(!vb->W){
 320     if(blocktype==BLOCKTYPE_IMPULSE)
 321       fprintf(stderr,"|");
 322     else
 323       fprintf(stderr,".");
 324   }else{
 325     if(blocktype==BLOCKTYPE_TRANSITION)
 326       fprintf(stderr,"-");
 327     else
 328       fprintf(stderr,"_");
 329   }
 330
 331   for(i=0;i<vi->channels;i++){
 332     float scale=4.f/n;
 333
 334     /* the following makes things clearer to *me* anyway */
 335     float *pcm     =vb->pcm[i];
 336     float *fft     =work;
 337     float *logfft  =pcm+n/2;
 338
 339     /*float *res     =pcm;
 340     float *mdct    =pcm;
 341     float *codedflr=pcm+n/2;
 342     float *logmax  =work;
 343     float *logmask =work+n/2;*/
 344
 345     _analysis_output("pcm",seq+i,pcm,n,0,0);
 346
 347     /* window the PCM data */
 348     for(j=0;j<n;j++)
 349       fft[j]=pcm[j]*=window[j];
 350
 351     //_analysis_output("windowed",seq+i,pcm,n,0,0);
 352
 353     /* transform the PCM data */
 354     /* only MDCT right now.... */
 355     mdct_forward(b->transform[vb->W][0],pcm,pcm);
 356
 357     /* FFT yields more accurate tonal estimation (not phase sensitive) */
 358     drft_forward(&look->fft_look,fft);
 359     fft[0]*=scale;
 360     logfft[0]=todB(fft);
 361     local_ampmax[i]=logfft[0];
 362     for(j=1;j<n-1;j+=2){
 363       float temp=scale*FAST_HYPOT(fft[j],fft[j+1]);
 364       temp=logfft[(j+1)>>1]=todB(&temp);
 365       if(temp>local_ampmax[i])local_ampmax[i]=temp;
 366     }
 367
 368     if(local_ampmax[i]>0.f)local_ampmax[i]=0.f;
 369     if(local_ampmax[i]>global_ampmax)global_ampmax=local_ampmax[i];
 370
 371     _analysis_output("fft",seq+i,logfft,n/2,1,0);
 372   }
 373
 374   for(i=0;i<vi->channels;i++){
 375     int submap=info->chmuxlist[i];
 376
 377     /* the following makes things clearer to *me* anyway */
 378     float *mdct    =vb->pcm[i];
 379     float *res     =mdct;
 380     float *codedflr=mdct+n/2;
 381     float *logfft  =mdct+n/2;
 382
 383     float *logmdct =work;
 384     float *logmax  =mdct+n/2;
 385     float *logmask =work+n/2;
 386
 387     for(j=0;j<n/2;j++)
 388       logmdct[j]=todB(mdct+j);
 389     _analysis_output("mdct",seq+i,logmdct,n/2,1,0);
 390
 391
 392     /* perform psychoacoustics; do masking */
 393     _vp_compute_mask(look->psy_look[blocktype],
 394                      b->psy_g_look,
 395                      i,
 396                      logfft, /* -> logmax */
 397                      logmdct,
 398                      logmask,
 399                      global_ampmax,
 400                      local_ampmax[i],
 401                      ci->blocksizes[vb->lW]/2,
 402                      bm->avgnoise);
 403
 404     _analysis_output("mask",seq+i,logmask,n/2,1,0);
 405     /* perform floor encoding */
 406     nonzero[i]=look->floor_func[submap]->
 407       forward(vb,look->floor_look[submap],
 408               mdct,
 409               logmdct,
 410               logmask,
 411               logmax,
 412
 413               codedflr);
 414
 415
 416     _vp_remove_floor(look->psy_look[blocktype],
 417                      b->psy_g_look,
 418                      logmdct,
 419                      mdct,
 420                      codedflr,
 421                      res,
 422                      local_ampmax[i]);
 423
 424     /*for(j=0;j<n/2;j++)
 425       if(fabs(res[j])>1200){
 426         analysis_noisy=1;
 427         fprintf(stderr,"%ld ",seq+i);
 428         }*/
 429
 430     //_analysis_output("res",seq+i,res,n/2,1,0);
 431     _analysis_output("codedflr",seq+i,codedflr,n/2,1,1);
 432
 433   }
 434
 435   vbi->ampmax=global_ampmax;
 436
 437   /* partition based prequantization and channel coupling */
 438   /* Steps in prequant and coupling:
 439
 440      classify by |mag| across all pcm vectors
 441
 442      down-couple/down-quantize from perfect residue ->  quantized vector
 443
 444      do{
 445         encode quantized vector; add encoded values to 'so-far' vector
 446         more? [not yet at bitrate/not yet at target]
 447           yes{
 448               down-couple/down-quantize from perfect-'so-far' ->
 449                 quantized vector; when subtracting coupling,
 450                 account for +/- out-of-phase component
 451           }no{
 452               break
 453           }
 454      }
 455      done.
 456
 457      quantization in each iteration is done (after circular normalization
 458      in coupling) using a by-iteration quantization granule value.
 459   */
 460
 461   {
 462     float  **pcm=vb->pcm;
 463     float  **quantized=alloca(sizeof(*quantized)*vi->channels);
 464     float  **sofar=alloca(sizeof(*sofar)*vi->channels);
 465
 466     long  ***classifications=alloca(sizeof(*classifications)*info->submaps);
 467     float ***qbundle=alloca(sizeof(*qbundle)*info->submaps);
 468     float ***pcmbundle=alloca(sizeof(*pcmbundle)*info->submaps);
 469     float ***sobundle=alloca(sizeof(*sobundle)*info->submaps);
 470     int    **zerobundle=alloca(sizeof(*zerobundle)*info->submaps);
 471     int     *chbundle=alloca(sizeof(*chbundle)*info->submaps);
 472     int      chcounter=0;
 473
 474     /* play a little loose with this abstraction */
 475     int   quant_passes=ci->coupling_passes;
 476
 477     for(i=0;i<vi->channels;i++){
 478       quantized[i]=_vorbis_block_alloc(vb,n*sizeof(*sofar[i]));
 479       sofar[i]=quantized[i]+n/2;
 480       memset(sofar[i],0,sizeof(*sofar[i])*n/2);
 481     }
 482
 483     qbundle[0]=alloca(sizeof(*qbundle[0])*vi->channels);
 484     pcmbundle[0]=alloca(sizeof(*pcmbundle[0])*vi->channels);
 485     sobundle[0]=alloca(sizeof(*sobundle[0])*vi->channels);
 486     zerobundle[0]=alloca(sizeof(*zerobundle[0])*vi->channels);
 487
 488     /* initial down-quantized coupling */
 489
 490     if(info->coupling_steps==0){
 491       /* this assumes all or nothing coupling right now.  it should pass
 492          through any channels left uncoupled, but it doesn't do that now */
 493       for(i=0;i<vi->channels;i++){
 494         float *lpcm=pcm[i];
 495         float *lqua=quantized[i];
 496         for(j=0;j<n/2;j++)
 497           lqua[j]=lpcm[j];
 498       }
 499     }else{
 500       _vp_quantize_couple(look->psy_look[blocktype],
 501                           info,
 502                           pcm,
 503                           sofar,
 504                           quantized,
 505                           nonzero,
 506                           0);
 507     }
 508
 509     //for(i=0;i<vi->channels;i++)
 510     //_analysis_output("quant",seq+i,quantized[i],n/2,1,0);
 511
 512
 513     /* classify, by submap */
 514
 515     for(i=0;i<info->submaps;i++){
 516       int ch_in_bundle=0;
 517       qbundle[i]=qbundle[0]+chcounter;
 518       sobundle[i]=sobundle[0]+chcounter;
 519       zerobundle[i]=zerobundle[0]+chcounter;
 520
 521       for(j=0;j<vi->channels;j++){
 522         if(info->chmuxlist[j]==i){
 523           if(nonzero[j])
 524             zerobundle[i][ch_in_bundle]=1;
 525           else
 526             zerobundle[i][ch_in_bundle]=0;
 527           qbundle[i][ch_in_bundle]=quantized[j];
 528           pcmbundle[i][ch_in_bundle]=pcm[j];
 529           sobundle[i][ch_in_bundle++]=sofar[j];
 530         }
 531       }
 532       chbundle[i]=ch_in_bundle;
 533       chcounter+=ch_in_bundle;
 534
 535       classifications[i]=look->residue_func[i]->
 536         class(vb,look->residue_look[i],pcmbundle[i],zerobundle[i],chbundle[i]);
 537     }
 538
 539     /* actual encoding loop; we pack all the iterations to collect
 540        management data */
 541
 542     for(i=0;i<quant_passes;){
 543
 544       /* perform residue encoding of this pass's quantized residue
 545          vector, according residue mapping */
 546
 547       for(j=0;j<info->submaps;j++){
 548         look->residue_func[j]->
 549           forward(vb,look->residue_look[j],
 550                   qbundle[j],sobundle[j],zerobundle[j],chbundle[j],
 551                   i,classifications[j],vbi->packet_markers);
 552
 553       }
 554       i++;
 555
 556       if(i<quant_passes){
 557         /* down-couple/down-quantize from perfect-'so-far' ->
 558          new quantized vector */
 559         if(info->coupling_steps==0){
 560           /* this assumes all or nothing coupling right now.  it should pass
 561              through any channels left uncoupled, but it doesn't do that now */
 562           int k;
 563           for(k=0;k<vi->channels;k++){
 564             float *lpcm=pcm[k];
 565             float *lsof=sofar[k];
 566             float *lqua=quantized[k];
 567             for(j=0;j<n/2;j++)
 568               lqua[j]=lpcm[j]-lsof[j];
 569           }
 570         }else{
 571           char buf[80];
 572
 573           _vp_quantize_couple(look->psy_look[blocktype],
 574                               info,
 575                               pcm,
 576                               sofar,
 577                               quantized,
 578                               nonzero,
 579                               i);
 580
 581           //sprintf(buf,"quant%d",i);
 582           //for(j=0;j<vi->channels;j++)
 583           //_analysis_output(buf,seq+j,quantized[j],n/2,1,0);
 584
 585         }
 586       }
 587     }
 588     seq+=vi->channels;
 589   }
 590
 591   look->lastframe=vb->sequence;
 592   return(0);
 593 }
 594
 595 static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
 596   vorbis_dsp_state     *vd=vb->vd;
 597   vorbis_info          *vi=vd->vi;
 598   codec_setup_info     *ci=vi->codec_setup;
 599   backend_lookup_state *b=vd->backend_state;
 600   vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
 601   vorbis_info_mapping0 *info=look->map;
 602   vorbis_info_mode     *mode=look->mode;
 603   int                   i,j;
 604   long                  n=vb->pcmend=ci->blocksizes[vb->W];
 605
 606   float *window=b->window[vb->W][vb->lW][vb->nW][mode->windowtype];
 607   float **pcmbundle=alloca(sizeof(*pcmbundle)*vi->channels);
 608   int    *zerobundle=alloca(sizeof(*zerobundle)*vi->channels);
 609
 610   int   *nonzero  =alloca(sizeof(*nonzero)*vi->channels);
 611   void **floormemo=alloca(sizeof(*floormemo)*vi->channels);
 612
 613   /* time domain information decode (note that applying the
 614      information would have to happen later; we'll probably add a
 615      function entry to the harness for that later */
 616   /* NOT IMPLEMENTED */
 617
 618   /* recover the spectral envelope; store it in the PCM vector for now */
 619   for(i=0;i<vi->channels;i++){
 620     int submap=info->chmuxlist[i];
 621     floormemo[i]=look->floor_func[submap]->
 622       inverse1(vb,look->floor_look[submap]);
 623     if(floormemo[i])
 624       nonzero[i]=1;
 625     else
 626       nonzero[i]=0;
 627     memset(vb->pcm[i],0,sizeof(*vb->pcm[i])*n/2);
 628   }
 629
 630   /* channel coupling can 'dirty' the nonzero listing */
 631   for(i=0;i<info->coupling_steps;i++){
 632     if(nonzero[info->coupling_mag[i]] ||
 633        nonzero[info->coupling_ang[i]]){
 634       nonzero[info->coupling_mag[i]]=1;
 635       nonzero[info->coupling_ang[i]]=1;
 636     }
 637   }
 638
 639   /* recover the residue into our working vectors */
 640   for(i=0;i<info->submaps;i++){
 641     int ch_in_bundle=0;
 642     for(j=0;j<vi->channels;j++){
 643       if(info->chmuxlist[j]==i){
 644         if(nonzero[j])
 645           zerobundle[ch_in_bundle]=1;
 646         else
 647           zerobundle[ch_in_bundle]=0;
 648         pcmbundle[ch_in_bundle++]=vb->pcm[j];
 649       }
 650     }
 651
 652     look->residue_func[i]->inverse(vb,look->residue_look[i],
 653                                    pcmbundle,zerobundle,ch_in_bundle);
 654   }
 655
 656   /* channel coupling */
 657   for(i=info->coupling_steps-1;i>=0;i--){
 658     float *pcmM=vb->pcm[info->coupling_mag[i]];
 659     float *pcmA=vb->pcm[info->coupling_ang[i]];
 660
 661     for(j=0;j<n/2;j++){
 662       float mag=pcmM[j];
 663       float ang=pcmA[j];
 664
 665       if(mag>0)
 666         if(ang>0){
 667           pcmM[j]=mag;
 668           pcmA[j]=mag-ang;
 669         }else{
 670           pcmA[j]=mag;
 671           pcmM[j]=mag+ang;
 672         }
 673       else
 674         if(ang>0){
 675           pcmM[j]=mag;
 676           pcmA[j]=mag+ang;
 677         }else{
 678           pcmA[j]=mag;
 679           pcmM[j]=mag-ang;
 680         }
 681     }
 682   }
 683
 684   /* compute and apply spectral envelope */
 685   for(i=0;i<vi->channels;i++){
 686     float *pcm=vb->pcm[i];
 687     int submap=info->chmuxlist[i];
 688     look->floor_func[submap]->
 689       inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
 690   }
 691
 692   /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
 693   /* only MDCT right now.... */
 694   for(i=0;i<vi->channels;i++){
 695     float *pcm=vb->pcm[i];
 696     //_analysis_output("out",seq+i,pcm,n/2,1,1);
 697     //_analysis_output("lout",seq+i,pcm,n/2,0,0);
 698     mdct_backward(b->transform[vb->W][0],pcm,pcm);
 699   }
 700
 701   /* window the data */
 702   for(i=0;i<vi->channels;i++){
 703     float *pcm=vb->pcm[i];
 704     if(nonzero[i])
 705       for(j=0;j<n;j++)
 706         pcm[j]*=window[j];
 707     else
 708       for(j=0;j<n;j++)
 709         pcm[j]=0.f;
 710
 711     //_analysis_output("final",seq,pcm,n,0,0);
 712   }
 713
 714   /* now apply the decoded post-window time information */
 715   /* NOT IMPLEMENTED */
 716
 717   fprintf(stderr,"seq %d\r",seq);
 718
 719   /* all done! */
 720   return(0);
 721 }
 722
 723 /* export hooks */
 724 vorbis_func_mapping mapping0_exportbundle={
 725   &mapping0_pack,
 726   &mapping0_unpack,
 727   &mapping0_look,
 728   &mapping0_copy_info,
 729   &mapping0_free_info,
 730   &mapping0_free_look,
 731   &mapping0_forward,
 732   &mapping0_inverse
 733 };