lib/mapping0.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
   5  * THE GNU LESSER/LIBRARY PUBLIC LICENSE, WHICH IS INCLUDED WITH    *
   6  * THIS SOURCE. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.        *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2000             *
   9  * by Monty <monty@xiph.org> and the XIPHOPHORUS Company            *
  10  * http://www.xiph.org/                                             *
  11  *                                                                  *
  12  ********************************************************************
  13
  14  function: channel mapping 0 implementation
  15  last mod: $Id: mapping0.c,v 1.21 2000/12/12 08:54:27 xiphmont Exp $
  16
  17  ********************************************************************/
  18
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <math.h>
  23 #include <ogg/ogg.h>
  24 #include "vorbis/codec.h"
  25 #include "codec_internal.h"
  26 #include "codebook.h"
  27 #include "bitbuffer.h"
  28 #include "registry.h"
  29 #include "psy.h"
  30 #include "misc.h"
  31
  32 /* simplistic, wasteful way of doing this (unique lookup for each
  33    mode/submapping); there should be a central repository for
  34    identical lookups.  That will require minor work, so I'm putting it
  35    off as low priority.
  36
  37    Why a lookup for each backend in a given mode?  Because the
  38    blocksize is set by the mode, and low backend lookups may require
  39    parameters from other areas of the mode/mapping */
  40
  41 typedef struct {
  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   float **decay;
  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(vorbis_info_mapping0));
  64   memcpy(ret,info,sizeof(vorbis_info_mapping0));
  65   return(ret);
  66 }
  67
  68 static void mapping0_free_info(vorbis_info_mapping *i){
  69   if(i){
  70     memset(i,0,sizeof(vorbis_info_mapping0));
  71     _ogg_free(i);
  72   }
  73 }
  74
  75 static void mapping0_free_look(vorbis_look_mapping *look){
  76   int i;
  77   vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;
  78   if(l){
  79     for(i=0;i<l->map->submaps;i++){
  80       l->time_func[i]->free_look(l->time_look[i]);
  81       l->floor_func[i]->free_look(l->floor_look[i]);
  82       l->residue_func[i]->free_look(l->residue_look[i]);
  83       if(l->psy_look)_vp_psy_clear(l->psy_look+i);
  84     }
  85
  86     if(l->decay){
  87       for(i=0;i<l->ch;i++){
  88         if(l->decay[i])_ogg_free(l->decay[i]);
  89       }
  90       _ogg_free(l->decay);
  91     }
  92
  93     _ogg_free(l->time_func);
  94     _ogg_free(l->floor_func);
  95     _ogg_free(l->residue_func);
  96     _ogg_free(l->time_look);
  97     _ogg_free(l->floor_look);
  98     _ogg_free(l->residue_look);
  99     if(l->psy_look)_ogg_free(l->psy_look);
 100     memset(l,0,sizeof(vorbis_look_mapping0));
 101     _ogg_free(l);
 102   }
 103 }
 104
 105 static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
 106                           vorbis_info_mapping *m){
 107   int i;
 108   vorbis_info          *vi=vd->vi;
 109   codec_setup_info     *ci=vi->codec_setup;
 110   vorbis_look_mapping0 *look=_ogg_calloc(1,sizeof(vorbis_look_mapping0));
 111   vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
 112   look->mode=vm;
 113
 114   look->time_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_time *));
 115   look->floor_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_floor *));
 116
 117   look->residue_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_residue *));
 118   if(ci->psys)look->psy_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_psy));
 119
 120   look->time_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_time *));
 121   look->floor_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_floor *));
 122   look->residue_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_residue *));
 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     if(ci->psys && vd->analysisp){
 140       int psynum=info->psysubmap[i];
 141       _vp_psy_init(look->psy_look+i,ci->psy_param[psynum],
 142                    ci->blocksizes[vm->blockflag]/2,vi->rate);
 143     }
 144   }
 145
 146   look->ch=vi->channels;
 147   if(ci->psys){
 148     look->decay=_ogg_calloc(vi->channels,sizeof(float *));
 149     for(i=0;i<vi->channels;i++)
 150       look->decay[i]=_ogg_calloc(ci->blocksizes[vm->blockflag]/2,sizeof(float));
 151   }
 152
 153   return(look);
 154 }
 155
 156 static void mapping0_pack(vorbis_info *vi,vorbis_info_mapping *vm,oggpack_buffer *opb){
 157   int i;
 158   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)vm;
 159
 160   oggpack_write(opb,info->submaps-1,4);
 161   /* we don't write the channel submappings if we only have one... */
 162   if(info->submaps>1){
 163     for(i=0;i<vi->channels;i++)
 164       oggpack_write(opb,info->chmuxlist[i],4);
 165   }
 166   for(i=0;i<info->submaps;i++){
 167     oggpack_write(opb,info->timesubmap[i],8);
 168     oggpack_write(opb,info->floorsubmap[i],8);
 169     oggpack_write(opb,info->residuesubmap[i],8);
 170   }
 171 }
 172
 173 /* also responsible for range checking */
 174 static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
 175   int i;
 176   vorbis_info_mapping0 *info=_ogg_calloc(1,sizeof(vorbis_info_mapping0));
 177   codec_setup_info     *ci=vi->codec_setup;
 178   memset(info,0,sizeof(vorbis_info_mapping0));
 179
 180   info->submaps=oggpack_read(opb,4)+1;
 181
 182   if(info->submaps>1){
 183     for(i=0;i<vi->channels;i++){
 184       info->chmuxlist[i]=oggpack_read(opb,4);
 185       if(info->chmuxlist[i]>=info->submaps)goto err_out;
 186     }
 187   }
 188   for(i=0;i<info->submaps;i++){
 189     info->timesubmap[i]=oggpack_read(opb,8);
 190     if(info->timesubmap[i]>=ci->times)goto err_out;
 191     info->floorsubmap[i]=oggpack_read(opb,8);
 192     if(info->floorsubmap[i]>=ci->floors)goto err_out;
 193     info->residuesubmap[i]=oggpack_read(opb,8);
 194     if(info->residuesubmap[i]>=ci->residues)goto err_out;
 195   }
 196
 197   return info;
 198
 199  err_out:
 200   mapping0_free_info(info);
 201   return(NULL);
 202 }
 203
 204 #include "os.h"
 205 #include "lpc.h"
 206 #include "lsp.h"
 207 #include "envelope.h"
 208 #include "mdct.h"
 209 #include "psy.h"
 210 #include "scales.h"
 211
 212 /* no time mapping implementation for now */
 213 static long seq=0;
 214 static int mapping0_forward(vorbis_block *vb,vorbis_look_mapping *l){
 215   vorbis_dsp_state     *vd=vb->vd;
 216   vorbis_info          *vi=vd->vi;
 217   backend_lookup_state *b=vb->vd->backend_state;
 218   vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
 219   vorbis_info_mapping0 *info=look->map;
 220   vorbis_info_mode     *mode=look->mode;
 221   int                   n=vb->pcmend;
 222   int i,j;
 223   float *window=b->window[vb->W][vb->lW][vb->nW][mode->windowtype];
 224
 225   float **pcmbundle=alloca(sizeof(float *)*vi->channels);
 226
 227   int    *nonzero=alloca(sizeof(int)*vi->channels);
 228   float **floor=_vorbis_block_alloc(vb,vi->channels*sizeof(float *));
 229   float **nonquant=_vorbis_block_alloc(vb,vi->channels*sizeof(float *));
 230
 231   vorbis_bitbuffer      vbb_res;
 232   vorbis_bitbuffer      *vbb_flr=_vorbis_block_alloc(vb,
 233                                                      sizeof(vorbis_bitbuffer)*
 234                                                      vi->channels);
 235
 236   for(i=0;i<vi->channels;i++)
 237     bitbuf_init(vbb_flr+i,vb);
 238   bitbuf_init(&vbb_res,vb);
 239
 240   /* time domain pre-window: NONE IMPLEMENTED */
 241
 242   /* window the PCM data: takes PCM vector, vb; modifies PCM vector */
 243
 244   for(i=0;i<vi->channels;i++){
 245     float *pcm=vb->pcm[i];
 246     for(j=0;j<n;j++)
 247       pcm[j]*=window[j];
 248   }
 249
 250   /* time-domain post-window: NONE IMPLEMENTED */
 251
 252   /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
 253   /* only MDCT right now.... */
 254   for(i=0;i<vi->channels;i++){
 255     float *pcm=vb->pcm[i];
 256     float *outq=nonquant[i]=_vorbis_block_alloc(vb,n*sizeof(float));
 257     mdct_forward(b->transform[vb->W][0],pcm,pcm);
 258
 259     memcpy(pcm+n/2,pcm,n*sizeof(float)/2);
 260     mdct_backward(b->transform[vb->W][0],pcm,outq);
 261     for(j=0;j<n;j++)
 262       outq[j]*=window[j];
 263
 264   }
 265
 266   {
 267     for(i=0;i<vi->channels;i++){
 268       float *pcm=vb->pcm[i];
 269       float *decay=look->decay[i];
 270       int submap=info->chmuxlist[i];
 271       floor[i]=_vorbis_block_alloc(vb,n*sizeof(float)/2);
 272
 273       /* if some other mode/mapping was called last frame, our decay
 274          accumulator is out of date.  Clear it. */
 275       if(look->lastframe+1 != vb->sequence)
 276         memset(decay,0,n*sizeof(float)/2);
 277
 278       /* perform psychoacoustics; do masking */
 279       _vp_compute_mask(look->psy_look+submap,pcm,floor[i],decay);
 280
 281       _analysis_output("decay",seq,decay,n/2,0,1);
 282       _analysis_output("mdct",seq,pcm,n/2,0,1);
 283       _analysis_output("lmdct",seq,pcm,n/2,0,0);
 284       _analysis_output("prefloor",seq,floor[i],n/2,0,1);
 285
 286       /* perform floor encoding */
 287       nonzero[i]=look->floor_func[submap]->
 288         forward(vb,look->floor_look[submap],floor[i],floor[i],vbb_flr+i);
 289
 290       _analysis_output("floor",seq,floor[i],n/2,0,1);
 291
 292       /* apply the floor, do optional noise levelling */
 293       _vp_apply_floor(look->psy_look+submap,pcm,floor[i]);
 294
 295       _analysis_output("res",seq++,pcm,n/2,0,0);
 296
 297 #ifdef TRAIN_RES
 298       if(nonzero[i]){
 299         FILE *of;
 300         char buffer[80];
 301         int i;
 302
 303         sprintf(buffer,"residue_%d.vqd",vb->mode);
 304         of=fopen(buffer,"a");
 305         for(i=0;i<n/2;i++)
 306           fprintf(of,"%.2f, ",pcm[i]);
 307         fprintf(of,"\n");
 308         fclose(of);
 309       }
 310 #endif
 311
 312     }
 313
 314     /* perform residue encoding with residue mapping; this is
 315        multiplexed.  All the channels belonging to one submap are
 316        encoded (values interleaved), then the next submap, etc */
 317
 318     for(i=0;i<info->submaps;i++){
 319       int ch_in_bundle=0;
 320       for(j=0;j<vi->channels;j++){
 321         if(info->chmuxlist[j]==i && nonzero[j]>0){
 322           pcmbundle[ch_in_bundle++]=vb->pcm[j];
 323         }
 324       }
 325
 326       look->residue_func[i]->forward(vb,look->residue_look[i],
 327                                      pcmbundle,ch_in_bundle,&vbb_res);
 328     }
 329
 330     /* go back and compute the original MDCT inverse and our quantized
 331        inverse; we'll want to give the floor mapping a shot at
 332        massaging things before we write out the final version. */
 333
 334     {
 335       for(i=0;i<vi->channels;i++){
 336         float *pcm=vb->pcm[i];
 337         float *pcmori=vb->pcm[i]+n/2;
 338         float *orig=nonquant[i];
 339         float *quant=floor[i];
 340         float num=0.,den=0.;
 341         int submap=info->chmuxlist[i];
 342
 343         if(nonzero[i]){
 344
 345           for(j=0;j<n/2;j++)
 346             pcm[j]=pcmori[j]-pcm[j]*quant[j];
 347
 348           mdct_backward(b->transform[vb->W][0],pcm,pcm);
 349           for(j=0;j<n;j++)
 350             pcm[j]*=window[j];
 351
 352           /* weighted compare twixt original and quantized mdct output */
 353           for(j=0;j<n;j++){
 354             den+=(pcm[j]*pcm[j]);
 355             num+=(orig[j]*orig[j]);
 356           }
 357
 358           num=sqrt(num);
 359           den=sqrt(den);
 360
 361         }
 362
 363         num=look->floor_func[submap]->
 364           forward2(vb,look->floor_look[submap],
 365                    nonzero[i],den==0.?0:num/den,vbb_flr+i);
 366
 367         /*for(j=0;j<n;j++)
 368           pcm[j]*=num;
 369         _analysis_output("i_orig",seq,orig,n,0,0);
 370         _analysis_output("i_quant",seq++,pcm,n,0,0);
 371         */
 372
 373       }
 374     }
 375
 376     bitbuf_pack(&vb->opb,&vbb_res);
 377
 378   }
 379
 380   look->lastframe=vb->sequence;
 381   return(0);
 382 }
 383
 384 static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
 385   vorbis_dsp_state     *vd=vb->vd;
 386   vorbis_info          *vi=vd->vi;
 387   codec_setup_info     *ci=vi->codec_setup;
 388   backend_lookup_state *b=vd->backend_state;
 389   vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
 390   vorbis_info_mapping0 *info=look->map;
 391   vorbis_info_mode     *mode=look->mode;
 392   int                   i,j;
 393   long                  n=vb->pcmend=ci->blocksizes[vb->W];
 394
 395   float *window=b->window[vb->W][vb->lW][vb->nW][mode->windowtype];
 396   float **pcmbundle=alloca(sizeof(float *)*vi->channels);
 397   int *nonzero=alloca(sizeof(int)*vi->channels);
 398
 399   /* time domain information decode (note that applying the
 400      information would have to happen later; we'll probably add a
 401      function entry to the harness for that later */
 402   /* NOT IMPLEMENTED */
 403
 404   /* recover the spectral envelope; store it in the PCM vector for now */
 405   for(i=0;i<vi->channels;i++){
 406     float *pcm=vb->pcm[i];
 407     int submap=info->chmuxlist[i];
 408     nonzero[i]=look->floor_func[submap]->
 409       inverse(vb,look->floor_look[submap],pcm);
 410     _analysis_output("ifloor",seq+i,pcm,n/2,0,1);
 411   }
 412
 413   /* recover the residue, apply directly to the spectral envelope */
 414
 415   for(i=0;i<info->submaps;i++){
 416     int ch_in_bundle=0;
 417     for(j=0;j<vi->channels;j++){
 418       if(info->chmuxlist[j]==i && nonzero[j])
 419         pcmbundle[ch_in_bundle++]=vb->pcm[j];
 420     }
 421
 422     look->residue_func[i]->inverse(vb,look->residue_look[i],pcmbundle,ch_in_bundle);
 423   }
 424
 425   /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
 426   /* only MDCT right now.... */
 427   for(i=0;i<vi->channels;i++){
 428     float *pcm=vb->pcm[i];
 429     _analysis_output("out",seq+i,pcm,n/2,0,1);
 430     mdct_backward(b->transform[vb->W][0],pcm,pcm);
 431   }
 432
 433   /* now apply the decoded pre-window time information */
 434   /* NOT IMPLEMENTED */
 435
 436   /* window the data */
 437   for(i=0;i<vi->channels;i++){
 438     float *pcm=vb->pcm[i];
 439     if(nonzero[i])
 440       for(j=0;j<n;j++)
 441         pcm[j]*=window[j];
 442     else
 443       for(j=0;j<n;j++)
 444         pcm[j]=0.;
 445     _analysis_output("final",seq++,pcm,n,0,0);
 446   }
 447
 448   /* now apply the decoded post-window time information */
 449   /* NOT IMPLEMENTED */
 450
 451   /* all done! */
 452   return(0);
 453 }
 454
 455 /* export hooks */
 456 vorbis_func_mapping mapping0_exportbundle={
 457   &mapping0_pack,&mapping0_unpack,&mapping0_look,&mapping0_copy_info,
 458   &mapping0_free_info,&mapping0_free_look,&mapping0_forward,&mapping0_inverse
 459 };
 460
 461
 462