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 *
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   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 1.23 2001/01/22 01:38:25 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   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;
  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(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     drft_clear(&l->fft_look);
  80
  81     for(i=0;i<l->map->submaps;i++){
  82       l->time_func[i]->free_look(l->time_look[i]);
  83       l->floor_func[i]->free_look(l->floor_look[i]);
  84       l->residue_func[i]->free_look(l->residue_look[i]);
  85       if(l->psy_look)_vp_psy_clear(l->psy_look+i);
  86     }
  87
  88     _ogg_free(l->time_func);
  89     _ogg_free(l->floor_func);
  90     _ogg_free(l->residue_func);
  91     _ogg_free(l->time_look);
  92     _ogg_free(l->floor_look);
  93     _ogg_free(l->residue_look);
  94     if(l->psy_look)_ogg_free(l->psy_look);
  95     memset(l,0,sizeof(vorbis_look_mapping0));
  96     _ogg_free(l);
  97   }
  98 }
  99
 100 static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
 101                           vorbis_info_mapping *m){
 102   int i;
 103   vorbis_info          *vi=vd->vi;
 104   codec_setup_info     *ci=vi->codec_setup;
 105   vorbis_look_mapping0 *look=_ogg_calloc(1,sizeof(vorbis_look_mapping0));
 106   vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
 107   look->mode=vm;
 108
 109   look->time_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_time *));
 110   look->floor_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_floor *));
 111
 112   look->residue_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_residue *));
 113   if(ci->psys)look->psy_look=_ogg_calloc(info->submaps,sizeof(vorbis_look_psy));
 114
 115   look->time_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_time *));
 116   look->floor_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_floor *));
 117   look->residue_func=_ogg_calloc(info->submaps,sizeof(vorbis_func_residue *));
 118
 119   for(i=0;i<info->submaps;i++){
 120     int timenum=info->timesubmap[i];
 121     int floornum=info->floorsubmap[i];
 122     int resnum=info->residuesubmap[i];
 123
 124     look->time_func[i]=_time_P[ci->time_type[timenum]];
 125     look->time_look[i]=look->time_func[i]->
 126       look(vd,vm,ci->time_param[timenum]);
 127     look->floor_func[i]=_floor_P[ci->floor_type[floornum]];
 128     look->floor_look[i]=look->floor_func[i]->
 129       look(vd,vm,ci->floor_param[floornum]);
 130     look->residue_func[i]=_residue_P[ci->residue_type[resnum]];
 131     look->residue_look[i]=look->residue_func[i]->
 132       look(vd,vm,ci->residue_param[resnum]);
 133
 134     if(ci->psys && vd->analysisp){
 135       int psynum=info->psysubmap[i];
 136       _vp_psy_init(look->psy_look+i,ci->psy_param[psynum],
 137                    ci->blocksizes[vm->blockflag]/2,vi->rate);
 138     }
 139   }
 140
 141   look->ch=vi->channels;
 142
 143   if(vd->analysisp)drft_init(&look->fft_look,ci->blocksizes[vm->blockflag]);
 144   return(look);
 145 }
 146
 147 static void mapping0_pack(vorbis_info *vi,vorbis_info_mapping *vm,oggpack_buffer *opb){
 148   int i;
 149   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)vm;
 150
 151   oggpack_write(opb,info->submaps-1,4);
 152   /* we don't write the channel submappings if we only have one... */
 153   if(info->submaps>1){
 154     for(i=0;i<vi->channels;i++)
 155       oggpack_write(opb,info->chmuxlist[i],4);
 156   }
 157   for(i=0;i<info->submaps;i++){
 158     oggpack_write(opb,info->timesubmap[i],8);
 159     oggpack_write(opb,info->floorsubmap[i],8);
 160     oggpack_write(opb,info->residuesubmap[i],8);
 161   }
 162 }
 163
 164 /* also responsible for range checking */
 165 static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
 166   int i;
 167   vorbis_info_mapping0 *info=_ogg_calloc(1,sizeof(vorbis_info_mapping0));
 168   codec_setup_info     *ci=vi->codec_setup;
 169   memset(info,0,sizeof(vorbis_info_mapping0));
 170
 171   info->submaps=oggpack_read(opb,4)+1;
 172
 173   if(info->submaps>1){
 174     for(i=0;i<vi->channels;i++){
 175       info->chmuxlist[i]=oggpack_read(opb,4);
 176       if(info->chmuxlist[i]>=info->submaps)goto err_out;
 177     }
 178   }
 179   for(i=0;i<info->submaps;i++){
 180     info->timesubmap[i]=oggpack_read(opb,8);
 181     if(info->timesubmap[i]>=ci->times)goto err_out;
 182     info->floorsubmap[i]=oggpack_read(opb,8);
 183     if(info->floorsubmap[i]>=ci->floors)goto err_out;
 184     info->residuesubmap[i]=oggpack_read(opb,8);
 185     if(info->residuesubmap[i]>=ci->residues)goto err_out;
 186   }
 187
 188   return info;
 189
 190  err_out:
 191   mapping0_free_info(info);
 192   return(NULL);
 193 }
 194
 195 #include "os.h"
 196 #include "lpc.h"
 197 #include "lsp.h"
 198 #include "envelope.h"
 199 #include "mdct.h"
 200 #include "psy.h"
 201 #include "scales.h"
 202
 203 /* no time mapping implementation for now */
 204 static long seq=0;
 205 static int mapping0_forward(vorbis_block *vb,vorbis_look_mapping *l){
 206   vorbis_dsp_state      *vd=vb->vd;
 207   vorbis_info           *vi=vd->vi;
 208   backend_lookup_state  *b=vb->vd->backend_state;
 209   vorbis_look_mapping0  *look=(vorbis_look_mapping0 *)l;
 210   vorbis_info_mapping0  *info=look->map;
 211   vorbis_info_mode      *mode=look->mode;
 212   vorbis_block_internal *vbi=(vorbis_block_internal *)vb->internal;
 213   int                    n=vb->pcmend;
 214   int i,j;
 215   float *window=b->window[vb->W][vb->lW][vb->nW][mode->windowtype];
 216
 217   float **pcmbundle=alloca(sizeof(float *)*vi->channels);
 218
 219   int    *nonzero=alloca(sizeof(int)*vi->channels);
 220
 221   float **floor=_vorbis_block_alloc(vb,vi->channels*sizeof(float *));
 222   float *additional=_vorbis_block_alloc(vb,n*sizeof(float));
 223   float newmax=vbi->ampmax;
 224
 225   for(i=0;i<vi->channels;i++){
 226     float *pcm=vb->pcm[i];
 227     float scale=4.f/n;
 228     int submap=info->chmuxlist[i];
 229     float ret;
 230
 231     _analysis_output("pcm",seq,pcm,n,0,0);
 232
 233     /* window the PCM data */
 234     for(j=0;j<n;j++)
 235       additional[j]=pcm[j]*=window[j];
 236
 237     _analysis_output("windowed",seq,pcm,n,0,0);
 238
 239     /* transform the PCM data */
 240     /* only MDCT right now.... */
 241     mdct_forward(b->transform[vb->W][0],pcm,pcm);
 242
 243     /* FFT yields more accurate tonal estimation (not phase sensitive) */
 244     drft_forward(&look->fft_look,additional);
 245
 246     additional[0]*=scale;
 247     for(j=1;j<n-1;j+=2)
 248       additional[(j+1)>>1]=scale*FAST_HYPOT(additional[j],additional[j+1]);
 249
 250     /* set up our masking data working vector, and stash unquantized
 251        data for later */
 252     /*memcpy(pcm+n/2,pcm,n*sizeof(float)/2);*/
 253     memcpy(additional+n/2,pcm,n*sizeof(float)/2);
 254
 255     /* begin masking work */
 256     floor[i]=_vorbis_block_alloc(vb,n*sizeof(float)/2);
 257
 258     //_analysis_output("fft",seq,additional,n/2,0,1);
 259     //_analysis_output("mdct",seq,additional+n/2,n/2,0,1);
 260     //_analysis_output("lfft",seq,additional,n/2,0,0);
 261     //_analysis_output("lmdct",seq,additional+n/2,n/2,0,0);
 262
 263     /* perform psychoacoustics; do masking */
 264     ret=_vp_compute_mask(look->psy_look+submap,additional,additional+n/2,
 265                          floor[i],NULL,vbi->ampmax);
 266     if(ret>newmax)newmax=ret;
 267
 268     _analysis_output("prefloor",seq,floor[i],n/2,0,0);
 269
 270     /* perform floor encoding */
 271     nonzero[i]=look->floor_func[submap]->
 272       forward(vb,look->floor_look[submap],floor[i]);
 273
 274     _analysis_output("floor",seq,floor[i],n/2,0,1);
 275
 276     /* apply the floor, do optional noise levelling */
 277     _vp_apply_floor(look->psy_look+submap,pcm,floor[i]);
 278
 279     _analysis_output("res",seq++,pcm,n/2,0,0);
 280
 281 #ifdef TRAIN_RES
 282     if(nonzero[i]){
 283       FILE *of;
 284       char buffer[80];
 285       int i;
 286
 287       sprintf(buffer,"residue_%d.vqd",vb->mode);
 288       of=fopen(buffer,"a");
 289       for(i=0;i<n/2;i++)
 290         fprintf(of,"%.2f, ",pcm[i]);
 291       fprintf(of,"\n");
 292       fclose(of);
 293     }
 294 #endif
 295
 296   }
 297
 298   vbi->ampmax=newmax;
 299
 300   /* perform residue encoding with residue mapping; this is
 301      multiplexed.  All the channels belonging to one submap are
 302      encoded (values interleaved), then the next submap, etc */
 303
 304   for(i=0;i<info->submaps;i++){
 305     int ch_in_bundle=0;
 306     for(j=0;j<vi->channels;j++){
 307       if(info->chmuxlist[j]==i && nonzero[j]>0){
 308         pcmbundle[ch_in_bundle++]=vb->pcm[j];
 309       }
 310     }
 311
 312     look->residue_func[i]->forward(vb,look->residue_look[i],
 313                                    pcmbundle,ch_in_bundle);
 314   }
 315
 316   look->lastframe=vb->sequence;
 317   return(0);
 318 }
 319
 320 static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
 321   vorbis_dsp_state     *vd=vb->vd;
 322   vorbis_info          *vi=vd->vi;
 323   codec_setup_info     *ci=vi->codec_setup;
 324   backend_lookup_state *b=vd->backend_state;
 325   vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
 326   vorbis_info_mapping0 *info=look->map;
 327   vorbis_info_mode     *mode=look->mode;
 328   int                   i,j;
 329   long                  n=vb->pcmend=ci->blocksizes[vb->W];
 330
 331   float *window=b->window[vb->W][vb->lW][vb->nW][mode->windowtype];
 332   float **pcmbundle=alloca(sizeof(float *)*vi->channels);
 333   int *nonzero=alloca(sizeof(int)*vi->channels);
 334
 335   /* time domain information decode (note that applying the
 336      information would have to happen later; we'll probably add a
 337      function entry to the harness for that later */
 338   /* NOT IMPLEMENTED */
 339
 340   /* recover the spectral envelope; store it in the PCM vector for now */
 341   for(i=0;i<vi->channels;i++){
 342     float *pcm=vb->pcm[i];
 343     int submap=info->chmuxlist[i];
 344     nonzero[i]=look->floor_func[submap]->
 345       inverse(vb,look->floor_look[submap],pcm);
 346     _analysis_output("ifloor",seq+i,pcm,n/2,0,1);
 347   }
 348
 349   /* recover the residue, apply directly to the spectral envelope */
 350
 351   for(i=0;i<info->submaps;i++){
 352     int ch_in_bundle=0;
 353     for(j=0;j<vi->channels;j++){
 354       if(info->chmuxlist[j]==i && nonzero[j])
 355         pcmbundle[ch_in_bundle++]=vb->pcm[j];
 356     }
 357
 358     look->residue_func[i]->inverse(vb,look->residue_look[i],pcmbundle,ch_in_bundle);
 359   }
 360
 361   /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
 362   /* only MDCT right now.... */
 363   for(i=0;i<vi->channels;i++){
 364     float *pcm=vb->pcm[i];
 365     _analysis_output("out",seq+i,pcm,n/2,0,1);
 366     mdct_backward(b->transform[vb->W][0],pcm,pcm);
 367   }
 368
 369   /* now apply the decoded pre-window time information */
 370   /* NOT IMPLEMENTED */
 371
 372   /* window the data */
 373   for(i=0;i<vi->channels;i++){
 374     float *pcm=vb->pcm[i];
 375     if(nonzero[i])
 376       for(j=0;j<n;j++)
 377         pcm[j]*=window[j];
 378     else
 379       for(j=0;j<n;j++)
 380         pcm[j]=0.f;
 381     _analysis_output("final",seq++,pcm,n,0,0);
 382   }
 383
 384   /* now apply the decoded post-window time information */
 385   /* NOT IMPLEMENTED */
 386
 387   /* all done! */
 388   return(0);
 389 }
 390
 391 /* export hooks */
 392 vorbis_func_mapping mapping0_exportbundle={
 393   &mapping0_pack,&mapping0_unpack,&mapping0_look,&mapping0_copy_info,
 394   &mapping0_free_info,&mapping0_free_look,&mapping0_forward,&mapping0_inverse
 395 };
 396
 397
 398