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 1.33 2001/06/17 22:25:50 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 "bitbuffer.h"
  27 #include "registry.h"
  28 #include "psy.h"
  29 #include "misc.h"
  30
  31 /* simplistic, wasteful way of doing this (unique lookup for each
  32    mode/submapping); there should be a central repository for
  33    identical lookups.  That will require minor work, so I'm putting it
  34    off as low priority.
  35
  36    Why a lookup for each backend in a given mode?  Because the
  37    blocksize is set by the mode, and low backend lookups may require
  38    parameters from other areas of the mode/mapping */
  39
  40 typedef struct {
  41   drft_lookup fft_look;
  42   vorbis_info_mode *mode;
  43   vorbis_info_mapping0 *map;
  44
  45   vorbis_look_time **time_look;
  46   vorbis_look_floor **floor_look;
  47
  48   vorbis_look_residue **residue_look;
  49   vorbis_look_psy *psy_look;
  50
  51   vorbis_func_time **time_func;
  52   vorbis_func_floor **floor_func;
  53   vorbis_func_residue **residue_func;
  54
  55   int ch;
  56   long lastframe; /* if a different mode is called, we need to
  57                      invalidate decay */
  58 } vorbis_look_mapping0;
  59
  60 static vorbis_info_mapping *mapping0_copy_info(vorbis_info_mapping *vm){
  61   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)vm;
  62   vorbis_info_mapping0 *ret=_ogg_malloc(sizeof(vorbis_info_mapping0));
  63   memcpy(ret,info,sizeof(vorbis_info_mapping0));
  64   return(ret);
  65 }
  66
  67 static void mapping0_free_info(vorbis_info_mapping *i){
  68   if(i){
  69     memset(i,0,sizeof(vorbis_info_mapping0));
  70     _ogg_free(i);
  71   }
  72 }
  73
  74 static void mapping0_free_look(vorbis_look_mapping *look){
  75   int i;
  76   vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;
  77   if(l){
  78     drft_clear(&l->fft_look);
  79
  80     for(i=0;i<l->map->submaps;i++){
  81       l->time_func[i]->free_look(l->time_look[i]);
  82       l->floor_func[i]->free_look(l->floor_look[i]);
  83       l->residue_func[i]->free_look(l->residue_look[i]);
  84       if(l->psy_look)_vp_psy_clear(l->psy_look+i);
  85     }
  86
  87     _ogg_free(l->time_func);
  88     _ogg_free(l->floor_func);
  89     _ogg_free(l->residue_func);
  90     _ogg_free(l->time_look);
  91     _ogg_free(l->floor_look);
  92     _ogg_free(l->residue_look);
  93     if(l->psy_look)_ogg_free(l->psy_look);
  94     memset(l,0,sizeof(vorbis_look_mapping0));
  95     _ogg_free(l);
  96   }
  97 }
  98
  99 static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
 100                           vorbis_info_mapping *m){
 101   int i;
 102   vorbis_info          *vi=vd->vi;
 103   codec_setup_info     *ci=vi->codec_setup;
 104   vorbis_look_mapping0 *look=_ogg_calloc(1,sizeof(vorbis_look_mapping0));
 105   vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
 106   look->mode=vm;
 107
 108   look->time_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_time *));
 109   look->floor_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_floor *));
 110
 111   look->residue_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_residue *));
 112   if(ci->psys)look->psy_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_psy));
 113
 114   look->time_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_time *));
 115   look->floor_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_floor *));
 116   look->residue_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_residue *));
 117
 118   for(i=0;i<info->submaps;i++){
 119     int timenum=info->timesubmap[i];
 120     int floornum=info->floorsubmap[i];
 121     int resnum=info->residuesubmap[i];
 122
 123     look->time_func[i]=_time_P[ci->time_type[timenum]];
 124     look->time_look[i]=look->time_func[i]->
 125       look(vd,vm,ci->time_param[timenum]);
 126     look->floor_func[i]=_floor_P[ci->floor_type[floornum]];
 127     look->floor_look[i]=look->floor_func[i]->
 128       look(vd,vm,ci->floor_param[floornum]);
 129     look->residue_func[i]=_residue_P[ci->residue_type[resnum]];
 130     look->residue_look[i]=look->residue_func[i]->
 131       look(vd,vm,ci->residue_param[resnum]);
 132
 133     if(ci->psys && vd->analysisp){
 134       int psynum=info->psysubmap[i];
 135       _vp_psy_init(look->psy_look+i,ci->psy_param[psynum],
 136                    ci->blocksizes[vm->blockflag]/2,vi->rate);
 137     }
 138   }
 139
 140   look->ch=vi->channels;
 141
 142   if(vd->analysisp)drft_init(&look->fft_look,ci->blocksizes[vm->blockflag]);
 143   return(look);
 144 }
 145
 146 static int ilog2(unsigned int v){
 147   int ret=0;
 148   while(v>1){
 149     ret++;
 150     v>>=1;
 151   }
 152   return(ret);
 153 }
 154
 155 static void mapping0_pack(vorbis_info *vi,vorbis_info_mapping *vm,oggpack_buffer *opb){
 156   int i;
 157   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)vm;
 158
 159   /* another 'we meant to do it this way' hack...  up to beta 4, we
 160      packed 4 binary zeros here to signify one submapping in use.  We
 161      now redefine that to mean four bitflags that indicate use of
 162      deeper features; bit0:submappings, bit1:coupling,
 163      bit2,3:reserved. This is backward compatable with all actual uses
 164      of the beta code. */
 165
 166   if(info->submaps>1){
 167     oggpack_write(opb,1,1);
 168     oggpack_write(opb,info->submaps-1,4);
 169   }else
 170     oggpack_write(opb,0,1);
 171
 172   if(info->coupling_steps>0){
 173     oggpack_write(opb,1,1);
 174     oggpack_write(opb,info->coupling_steps-1,8);
 175
 176     for(i=0;i<info->coupling_steps;i++){
 177       oggpack_write(opb,info->coupling_mag[i],ilog2(vi->channels));
 178       oggpack_write(opb,info->coupling_ang[i],ilog2(vi->channels));
 179     }
 180   }else
 181     oggpack_write(opb,0,1);
 182
 183   oggpack_write(opb,0,2); /* 2,3:reserved */
 184
 185   /* we don't write the channel submappings if we only have one... */
 186   if(info->submaps>1){
 187     for(i=0;i<vi->channels;i++)
 188       oggpack_write(opb,info->chmuxlist[i],4);
 189   }
 190   for(i=0;i<info->submaps;i++){
 191     oggpack_write(opb,info->timesubmap[i],8);
 192     oggpack_write(opb,info->floorsubmap[i],8);
 193     oggpack_write(opb,info->residuesubmap[i],8);
 194   }
 195 }
 196
 197 /* also responsible for range checking */
 198 static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
 199   int i;
 200   vorbis_info_mapping0 *info=_ogg_calloc(1,sizeof(vorbis_info_mapping0));
 201   codec_setup_info     *ci=vi->codec_setup;
 202   memset(info,0,sizeof(vorbis_info_mapping0));
 203
 204   if(oggpack_read(opb,1))
 205     info->submaps=oggpack_read(opb,4)+1;
 206   else
 207     info->submaps=1;
 208
 209   if(oggpack_read(opb,1)){
 210     info->coupling_steps=oggpack_read(opb,8)+1;
 211
 212     for(i=0;i<info->coupling_steps;i++){
 213       int testM=info->coupling_mag[i]=oggpack_read(opb,ilog2(vi->channels));
 214       int testA=info->coupling_ang[i]=oggpack_read(opb,ilog2(vi->channels));
 215
 216       if(testM<0 ||
 217          testA<0 ||
 218          testM==testA ||
 219          testM>=vi->channels ||
 220          testA>=vi->channels) goto err_out;
 221     }
 222
 223   }
 224
 225   if(oggpack_read(opb,2)>0)goto err_out; /* 2,3:reserved */
 226
 227   if(info->submaps>1){
 228     for(i=0;i<vi->channels;i++){
 229       info->chmuxlist[i]=oggpack_read(opb,4);
 230       if(info->chmuxlist[i]>=info->submaps)goto err_out;
 231     }
 232   }
 233   for(i=0;i<info->submaps;i++){
 234     info->timesubmap[i]=oggpack_read(opb,8);
 235     if(info->timesubmap[i]>=ci->times)goto err_out;
 236     info->floorsubmap[i]=oggpack_read(opb,8);
 237     if(info->floorsubmap[i]>=ci->floors)goto err_out;
 238     info->residuesubmap[i]=oggpack_read(opb,8);
 239     if(info->residuesubmap[i]>=ci->residues)goto err_out;
 240   }
 241
 242   return info;
 243
 244  err_out:
 245   mapping0_free_info(info);
 246   return(NULL);
 247 }
 248
 249 #include "os.h"
 250 #include "lpc.h"
 251 #include "lsp.h"
 252 #include "envelope.h"
 253 #include "mdct.h"
 254 #include "psy.h"
 255 #include "scales.h"
 256
 257 /* no time mapping implementation for now */
 258 static long seq=0;
 259 static int mapping0_forward(vorbis_block *vb,vorbis_look_mapping *l){
 260   vorbis_dsp_state      *vd=vb->vd;
 261   vorbis_info           *vi=vd->vi;
 262   backend_lookup_state  *b=vb->vd->backend_state;
 263   vorbis_look_mapping0  *look=(vorbis_look_mapping0 *)l;
 264   vorbis_info_mapping0  *info=look->map;
 265   vorbis_info_mode      *mode=look->mode;
 266   vorbis_block_internal *vbi=(vorbis_block_internal *)vb->internal;
 267   int                    n=vb->pcmend;
 268   int i,j;
 269   float *window=b->window[vb->W][vb->lW][vb->nW][mode->windowtype];
 270
 271   float **pcmbundle=alloca(sizeof(float *)*vi->channels);
 272   int    *zerobundle=alloca(sizeof(int)*vi->channels);
 273
 274   int    *nonzero=alloca(sizeof(int)*vi->channels);
 275
 276   float *work=_vorbis_block_alloc(vb,n*sizeof(float));
 277   float newmax=vbi->ampmax;
 278
 279   for(i=0;i<vi->channels;i++){
 280     float scale=4.f/n;
 281     int submap=info->chmuxlist[i];
 282     float ret;
 283
 284     /* the following makes things clearer to *me* anyway */
 285     float *pcm     =vb->pcm[i];
 286     float *mdct    =pcm;
 287     float *logmdct =pcm+n/2;
 288     float *res     =pcm;
 289     float *codedflr=pcm+n/2;
 290     float *fft     =work;
 291     float *logfft  =work;
 292     float *logmax  =work;
 293     float *logmask =work+n/2;
 294
 295     /* window the PCM data */
 296     for(j=0;j<n;j++)
 297       fft[j]=pcm[j]*=window[j];
 298
 299     /* transform the PCM data */
 300     /* only MDCT right now.... */
 301     mdct_forward(b->transform[vb->W][0],pcm,pcm);
 302     for(j=0;j<n/2;j++)
 303       logmdct[j]=todB(mdct+j);
 304
 305     /* FFT yields more accurate tonal estimation (not phase sensitive) */
 306     drft_forward(&look->fft_look,fft);
 307     fft[0]*=scale;
 308     fft[0]=todB(fft);
 309     for(j=1;j<n-1;j+=2){
 310       float temp=scale*FAST_HYPOT(fft[j],fft[j+1]);
 311       logfft[(j+1)>>1]=todB(&temp);
 312     }
 313
 314     _analysis_output("fft",seq,logfft,n/2,0,0);
 315     _analysis_output("mdct",seq,logmdct,n/2,0,0);
 316
 317     /* perform psychoacoustics; do masking */
 318     ret=_vp_compute_mask(look->psy_look+submap,
 319                          logfft, /* -> logmax */
 320                          logmdct,
 321                          logmask,
 322                          vbi->ampmax);
 323     if(ret>newmax)newmax=ret;
 324
 325     _analysis_output("mask",seq,logmask,n/2,0,0);
 326
 327     /* perform floor encoding */
 328     nonzero[i]=look->floor_func[submap]->
 329       forward(vb,look->floor_look[submap],
 330               mdct,
 331               logmdct,
 332               logmask,
 333               logmax,
 334               res,
 335               codedflr);
 336
 337     /*for(j=0;j<n/2;j++)
 338       if(fabs(vb->pcm[i][j]>200))
 339       fprintf(stderr,"%ld ",seq);*/
 340
 341     _analysis_output("res",seq-vi->channels+j,vb->pcm[i],n,0,0);
 342     _analysis_output("codedflr",seq++,codedflr,n/2,0,1);
 343
 344   }
 345
 346   vbi->ampmax=newmax;
 347
 348   /* channel coupling */
 349   for(i=0;i<info->coupling_steps;i++){
 350     if(nonzero[info->coupling_mag[i]] ||
 351        nonzero[info->coupling_ang[i]]){
 352
 353       float *pcmM=vb->pcm[info->coupling_mag[i]];
 354       float *pcmA=vb->pcm[info->coupling_ang[i]];
 355
 356     /*     +-
 357             B
 358             |       A-B
 359      -4 -3 -2 -1  0
 360             |
 361       3     |     1
 362             |
 363   -+  2-----+-----2----A ++
 364             |
 365       1     |     3
 366             |
 367       0 -1 -2 -3 -4
 368   B-A       |
 369            --
 370
 371     */
 372
 373       nonzero[info->coupling_mag[i]]=1;
 374       nonzero[info->coupling_ang[i]]=1;
 375
 376       for(j=n/2-1;j>=0;j--){
 377         float A=rint(pcmM[j]);
 378         float B=rint(pcmA[j]);
 379         float mag;
 380         float ang;
 381
 382         if(fabs(A)>fabs(B)){
 383           mag=A;
 384           if(A>0)
 385             ang=A-B;
 386           else
 387             ang=B-A;
 388         }else{
 389           mag=B;
 390         if(B>0)
 391           ang=A-B;
 392         else
 393           ang=B-A;
 394         }
 395
 396         /*if(fabs(mag)<3.5f)
 397           ang=rint(ang/(mag*2.f))*mag*2.f;*/
 398
 399         /*if(fabs(mag)<1.5)
 400         ang=0;
 401
 402         if(j>(n*3/16))
 403           ang=0;
 404
 405           if(ang>=fabs(mag*2))ang=-fabs(mag*2);*/
 406
 407         pcmM[j]=mag;
 408         pcmA[j]=ang;
 409       }
 410     }
 411   }
 412
 413   /* perform residue encoding with residue mapping; this is
 414      multiplexed.  All the channels belonging to one submap are
 415      encoded (values interleaved), then the next submap, etc */
 416
 417   for(i=0;i<info->submaps;i++){
 418     int ch_in_bundle=0;
 419     for(j=0;j<vi->channels;j++){
 420       if(info->chmuxlist[j]==i){
 421         if(nonzero[j])
 422           zerobundle[ch_in_bundle]=1;
 423         else
 424           zerobundle[ch_in_bundle]=0;
 425         pcmbundle[ch_in_bundle++]=vb->pcm[j];
 426       }
 427     }
 428
 429     look->residue_func[i]->forward(vb,look->residue_look[i],
 430                                    pcmbundle,zerobundle,ch_in_bundle);
 431   }
 432
 433   look->lastframe=vb->sequence;
 434   return(0);
 435 }
 436
 437 static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
 438   vorbis_dsp_state     *vd=vb->vd;
 439   vorbis_info          *vi=vd->vi;
 440   codec_setup_info     *ci=vi->codec_setup;
 441   backend_lookup_state *b=vd->backend_state;
 442   vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
 443   vorbis_info_mapping0 *info=look->map;
 444   vorbis_info_mode     *mode=look->mode;
 445   int                   i,j;
 446   long                  n=vb->pcmend=ci->blocksizes[vb->W];
 447
 448   float *window=b->window[vb->W][vb->lW][vb->nW][mode->windowtype];
 449   float **pcmbundle=alloca(sizeof(float *)*vi->channels);
 450   int    *zerobundle=alloca(sizeof(int)*vi->channels);
 451
 452   int   *nonzero  =alloca(sizeof(int)*vi->channels);
 453   void **floormemo=alloca(sizeof(void *)*vi->channels);
 454
 455   /* time domain information decode (note that applying the
 456      information would have to happen later; we'll probably add a
 457      function entry to the harness for that later */
 458   /* NOT IMPLEMENTED */
 459
 460   /* recover the spectral envelope; store it in the PCM vector for now */
 461   for(i=0;i<vi->channels;i++){
 462     int submap=info->chmuxlist[i];
 463     floormemo[i]=look->floor_func[submap]->
 464       inverse1(vb,look->floor_look[submap]);
 465     if(floormemo[i])
 466       nonzero[i]=1;
 467     else
 468       nonzero[i]=0;
 469     memset(vb->pcm[i],0,sizeof(float)*n/2);
 470   }
 471
 472   /* channel coupling can 'dirty' the nonzero listing */
 473   for(i=0;i<info->coupling_steps;i++){
 474     if(nonzero[info->coupling_mag[i]] ||
 475        nonzero[info->coupling_ang[i]]){
 476       nonzero[info->coupling_mag[i]]=1;
 477       nonzero[info->coupling_ang[i]]=1;
 478     }
 479   }
 480
 481   /* recover the residue into our working vectors */
 482   for(i=0;i<info->submaps;i++){
 483     int ch_in_bundle=0;
 484     for(j=0;j<vi->channels;j++){
 485       if(info->chmuxlist[j]==i){
 486         if(nonzero[j])
 487           zerobundle[ch_in_bundle]=1;
 488         else
 489           zerobundle[ch_in_bundle]=0;
 490         pcmbundle[ch_in_bundle++]=vb->pcm[j];
 491       }
 492     }
 493
 494     look->residue_func[i]->inverse(vb,look->residue_look[i],
 495                                    pcmbundle,zerobundle,ch_in_bundle);
 496   }
 497
 498   /* channel coupling */
 499   for(i=info->coupling_steps-1;i>=0;i--){
 500     float *pcmM=vb->pcm[info->coupling_mag[i]];
 501     float *pcmA=vb->pcm[info->coupling_ang[i]];
 502
 503     for(j=0;j<n/2;j++){
 504       float mag=pcmM[j];
 505       float ang=pcmA[j];
 506
 507       if(mag>0)
 508         if(ang>0){
 509           pcmM[j]=mag;
 510           pcmA[j]=mag-ang;
 511         }else{
 512           pcmA[j]=mag;
 513           pcmM[j]=mag+ang;
 514         }
 515       else
 516         if(ang>0){
 517           pcmM[j]=mag;
 518           pcmA[j]=mag+ang;
 519         }else{
 520           pcmA[j]=mag;
 521           pcmM[j]=mag-ang;
 522         }
 523     }
 524   }
 525
 526   /* compute and apply spectral envelope */
 527   for(i=0;i<vi->channels;i++){
 528     float *pcm=vb->pcm[i];
 529     int submap=info->chmuxlist[i];
 530     look->floor_func[submap]->
 531       inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
 532   }
 533
 534   /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
 535   /* only MDCT right now.... */
 536   for(i=0;i<vi->channels;i++){
 537     float *pcm=vb->pcm[i];
 538     _analysis_output("out",seq+i,pcm,n/2,0,1);
 539     mdct_backward(b->transform[vb->W][0],pcm,pcm);
 540   }
 541
 542   /* window the data */
 543   for(i=0;i<vi->channels;i++){
 544     float *pcm=vb->pcm[i];
 545     if(nonzero[i])
 546       for(j=0;j<n;j++)
 547         pcm[j]*=window[j];
 548     else
 549       for(j=0;j<n;j++)
 550         pcm[j]=0.f;
 551     _analysis_output("final",seq++,pcm,n,0,0);
 552   }
 553
 554   /* now apply the decoded post-window time information */
 555   /* NOT IMPLEMENTED */
 556
 557   /* all done! */
 558   return(0);
 559 }
 560
 561 /* export hooks */
 562 vorbis_func_mapping mapping0_exportbundle={
 563   &mapping0_pack,&mapping0_unpack,&mapping0_look,&mapping0_copy_info,
 564   &mapping0_free_info,&mapping0_free_look,&mapping0_forward,&mapping0_inverse
 565 };