lib/res0.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 1994-2001             *
   9  * by the XIPHOPHORUS Company http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: residue backend 0 implementation
  14  last mod: $Id: res0.c,v 1.25 2001/02/02 03:51:57 xiphmont Exp $
  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 <stdio.h>
  27 #include <ogg/ogg.h>
  28 #include "vorbis/codec.h"
  29 #include "codec_internal.h"
  30 #include "registry.h"
  31 #include "codebook.h"
  32 #include "misc.h"
  33 #include "os.h"
  34
  35 typedef struct {
  36   vorbis_info_residue0 *info;
  37   int         map;
  38
  39   int         parts;
  40   codebook   *phrasebook;
  41   codebook ***partbooks;
  42
  43   int         partvals;
  44   int       **decodemap;
  45 } vorbis_look_residue0;
  46
  47 vorbis_info_residue *res0_copy_info(vorbis_info_residue *vr){
  48   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
  49   vorbis_info_residue0 *ret=_ogg_malloc(sizeof(vorbis_info_residue0));
  50   memcpy(ret,info,sizeof(vorbis_info_residue0));
  51   return(ret);
  52 }
  53
  54 void res0_free_info(vorbis_info_residue *i){
  55   if(i){
  56     memset(i,0,sizeof(vorbis_info_residue0));
  57     _ogg_free(i);
  58   }
  59 }
  60
  61 void res0_free_look(vorbis_look_residue *i){
  62   int j;
  63   if(i){
  64     vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
  65     for(j=0;j<look->parts;j++)
  66       if(look->partbooks[j])_ogg_free(look->partbooks[j]);
  67     _ogg_free(look->partbooks);
  68     for(j=0;j<look->partvals;j++)
  69       _ogg_free(look->decodemap[j]);
  70     _ogg_free(look->decodemap);
  71     memset(i,0,sizeof(vorbis_look_residue0));
  72     _ogg_free(i);
  73   }
  74 }
  75
  76 void res0_pack(vorbis_info_residue *vr,oggpack_buffer *opb){
  77   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
  78   int j,acc=0;
  79   oggpack_write(opb,info->begin,24);
  80   oggpack_write(opb,info->end,24);
  81
  82   oggpack_write(opb,info->grouping-1,24);  /* residue vectors to group and
  83                                              code with a partitioned book */
  84   oggpack_write(opb,info->partitions-1,6); /* possible partition choices */
  85   oggpack_write(opb,info->groupbook,8);  /* group huffman book */
  86   for(j=0;j<info->partitions;j++){
  87     oggpack_write(opb,info->secondstages[j],4); /* zero *is* a valid choice */
  88     acc+=info->secondstages[j];
  89   }
  90   for(j=0;j<acc;j++)
  91     oggpack_write(opb,info->booklist[j],8);
  92
  93 }
  94
  95 /* vorbis_info is for range checking */
  96 vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
  97   int j,acc=0;
  98   vorbis_info_residue0 *info=_ogg_calloc(1,sizeof(vorbis_info_residue0));
  99   codec_setup_info     *ci=vi->codec_setup;
 100
 101   info->begin=oggpack_read(opb,24);
 102   info->end=oggpack_read(opb,24);
 103   info->grouping=oggpack_read(opb,24)+1;
 104   info->partitions=oggpack_read(opb,6)+1;
 105   info->groupbook=oggpack_read(opb,8);
 106   for(j=0;j<info->partitions;j++){
 107     int cascade=info->secondstages[j]=oggpack_read(opb,4);
 108     if(cascade>1)goto errout; /* temporary!  when cascading gets
 109                                  reworked and actually used, we don't
 110                                  want old code to DTWT */
 111     acc+=cascade;
 112   }
 113   for(j=0;j<acc;j++){
 114     info->booklist[j]=oggpack_read(opb,8);
 115     if(info->booklist[j]==255)info->booklist[j]=-1;
 116   }
 117
 118   if(info->groupbook>=ci->books)goto errout;
 119   for(j=0;j<acc;j++)
 120     if(info->booklist[j]>=ci->books)goto errout;
 121
 122   return(info);
 123  errout:
 124   res0_free_info(info);
 125   return(NULL);
 126 }
 127
 128 vorbis_look_residue *res0_look (vorbis_dsp_state *vd,vorbis_info_mode *vm,
 129                           vorbis_info_residue *vr){
 130   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
 131   vorbis_look_residue0 *look=_ogg_calloc(1,sizeof(vorbis_look_residue0));
 132   backend_lookup_state *be=vd->backend_state;
 133
 134   int j,k,acc=0;
 135   int dim;
 136   look->info=info;
 137   look->map=vm->mapping;
 138
 139   look->parts=info->partitions;
 140   look->phrasebook=be->fullbooks+info->groupbook;
 141   dim=look->phrasebook->dim;
 142
 143   look->partbooks=_ogg_calloc(look->parts,sizeof(codebook **));
 144
 145   for(j=0;j<look->parts;j++){
 146     int stages=info->secondstages[j];
 147     if(stages){
 148       look->partbooks[j]=_ogg_malloc(stages*sizeof(codebook *));
 149       look->partbooks[j][0]=be->fullbooks+info->booklist[acc++];
 150     }
 151   }
 152
 153   look->partvals=rint(pow(look->parts,dim));
 154   look->decodemap=_ogg_malloc(look->partvals*sizeof(int *));
 155   for(j=0;j<look->partvals;j++){
 156     long val=j;
 157     long mult=look->partvals/look->parts;
 158     look->decodemap[j]=_ogg_malloc(dim*sizeof(int));
 159     for(k=0;k<dim;k++){
 160       long deco=val/mult;
 161       val-=deco*mult;
 162       mult/=look->parts;
 163       look->decodemap[j][k]=deco;
 164     }
 165   }
 166
 167   return(look);
 168 }
 169
 170
 171 /* does not guard against invalid settings; eg, a subn of 16 and a
 172    subgroup request of 32.  Max subn of 128 */
 173 static int _testhack(float *vec,int n,vorbis_look_residue0 *look,
 174                      int auxparts,int auxpartnum){
 175   vorbis_info_residue0 *info=look->info;
 176   int i,j=0;
 177   float max,localmax=0.f;
 178   float temp[128];
 179   float entropy[8];
 180
 181   /* setup */
 182   for(i=0;i<n;i++)temp[i]=fabs(vec[i]);
 183
 184   /* handle case subgrp==1 outside */
 185   for(i=0;i<n;i++)
 186     if(temp[i]>localmax)localmax=temp[i];
 187   max=localmax;
 188
 189   for(i=0;i<n;i++)temp[i]=rint(temp[i]);
 190
 191   while(1){
 192     entropy[j]=localmax;
 193     n>>=1;
 194     j++;
 195
 196     if(n<=0)break;
 197     for(i=0;i<n;i++){
 198       temp[i]+=temp[i+n];
 199     }
 200     localmax=0.f;
 201     for(i=0;i<n;i++)
 202       if(temp[i]>localmax)localmax=temp[i];
 203   }
 204
 205   for(i=0;i<auxparts-1;i++)
 206     if(auxpartnum<info->blimit[i] &&
 207        entropy[info->subgrp[i]]<=info->entmax[i] &&
 208        max<=info->ampmax[i])
 209       break;
 210
 211   return(i);
 212 }
 213
 214 static int _encodepart(oggpack_buffer *opb,float *vec, int n,
 215                        int stages, codebook **books,int mode,int part){
 216   int i,j=0,bits=0;
 217   if(stages){
 218     int dim=books[j]->dim;
 219     int step=n/dim;
 220     for(i=0;i<step;i++){
 221       int entry=vorbis_book_besterror(books[j],vec+i,step,0);
 222 #ifdef TRAIN_RESENT
 223       {
 224         char buf[80];
 225         FILE *f;
 226         sprintf(buf,"res0_%da%d_%d.vqd",mode,j,part);
 227         f=fopen(buf,"a");
 228         fprintf(f,"%d\n",entry);
 229         fclose(f);
 230       }
 231 #endif
 232       bits+=vorbis_book_encode(books[j],entry,opb);
 233     }
 234   }
 235   return(bits);
 236 }
 237
 238 static int _decodepart(oggpack_buffer *opb,float *work,float *vec, int n,
 239                        int stages, codebook **books){
 240   int i;
 241
 242   memset(work,0,sizeof(float)*n);
 243   if(stages){
 244     int dim=books[0]->dim;
 245     int step=n/dim;
 246     if(s_vorbis_book_decodevs(books[0],work,opb,step,0)==-1)
 247       return(-1);
 248   }
 249
 250   for(i=0;i<n;i++)
 251     vec[i]*=work[i];
 252
 253   return(0);
 254 }
 255
 256 int res0_forward(vorbis_block *vb,vorbis_look_residue *vl,
 257             float **in,int ch){
 258   long i,j,k,l;
 259   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 260   vorbis_info_residue0 *info=look->info;
 261
 262   /* move all this setup out later */
 263   int samples_per_partition=info->grouping;
 264   int possible_partitions=info->partitions;
 265   int partitions_per_word=look->phrasebook->dim;
 266   int n=info->end-info->begin;
 267   long phrasebits=0,resbitsT=0;
 268   long *resbits=alloca(sizeof(long)*possible_partitions);
 269   long *resvals=alloca(sizeof(long)*possible_partitions);
 270
 271   int partvals=n/samples_per_partition;
 272   int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
 273   long **partword=_vorbis_block_alloc(vb,ch*sizeof(long *));
 274
 275   partvals=partwords*partitions_per_word;
 276
 277   /* we find the patition type for each partition of each
 278      channel.  We'll go back and do the interleaved encoding in a
 279      bit.  For now, clarity */
 280
 281   memset(resbits,0,sizeof(long)*possible_partitions);
 282   memset(resvals,0,sizeof(long)*possible_partitions);
 283
 284   for(i=0;i<ch;i++){
 285     partword[i]=_vorbis_block_alloc(vb,n/samples_per_partition*sizeof(long));
 286     memset(partword[i],0,n/samples_per_partition*sizeof(long));
 287   }
 288
 289   for(i=info->begin,l=0;i<info->end;i+=samples_per_partition,l++){
 290     for(j=0;j<ch;j++)
 291       /* do the partition decision based on the number of 'bits'
 292          needed to encode the block */
 293       partword[j][l]=
 294         _testhack(in[j]+i,samples_per_partition,look,possible_partitions,l);
 295
 296   }
 297   /* we code the partition words for each channel, then the residual
 298      words for a partition per channel until we've written all the
 299      residual words for that partition word.  Then write the next
 300      partition channel words... */
 301
 302   for(i=info->begin,l=0;i<info->end;){
 303
 304     /* first we encode a partition codeword for each channel */
 305     for(j=0;j<ch;j++){
 306       long val=partword[j][l];
 307       for(k=1;k<partitions_per_word;k++)
 308         val= val*possible_partitions+partword[j][l+k];
 309       phrasebits+=vorbis_book_encode(look->phrasebook,val,&vb->opb);
 310     }
 311     /* now we encode interleaved residual values for the partitions */
 312     for(k=0;k<partitions_per_word;k++,l++,i+=samples_per_partition)
 313       for(j=0;j<ch;j++){
 314         /*resbits[partword[j][l]]+=*/
 315         resbitsT+=_encodepart(&vb->opb,in[j]+i,samples_per_partition,
 316                               info->secondstages[partword[j][l]],
 317                               look->partbooks[partword[j][l]],look->map,partword[j][l]);
 318         resvals[partword[j][l]]+=samples_per_partition;
 319       }
 320
 321   }
 322
 323   for(i=0;i<possible_partitions;i++)resbitsT+=resbits[i];
 324   /*fprintf(stderr,
 325     "Encoded %ld res vectors in %ld phrasing and %ld res bits\n\t",
 326     ch*(info->end-info->begin),phrasebits,resbitsT);
 327     for(i=0;i<possible_partitions;i++)
 328     fprintf(stderr,"%ld(%ld):%ld ",i,resvals[i],resbits[i]);
 329     fprintf(stderr,"\n");*/
 330
 331   return(0);
 332 }
 333
 334 /* a truncated packet here just means 'stop working'; it's not an error */
 335 int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,float **in,int ch){
 336   long i,j,k,l,transend=vb->pcmend/2;
 337   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 338   vorbis_info_residue0 *info=look->info;
 339
 340   /* move all this setup out later */
 341   int samples_per_partition=info->grouping;
 342   int partitions_per_word=look->phrasebook->dim;
 343   int n=info->end-info->begin;
 344
 345   int partvals=n/samples_per_partition;
 346   int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
 347   int **partword=alloca(ch*sizeof(long *));
 348   float *work=alloca(sizeof(float)*samples_per_partition);
 349   partvals=partwords*partitions_per_word;
 350
 351   /* make sure we're zeroed up to the start */
 352   for(j=0;j<ch;j++)
 353     memset(in[j],0,sizeof(float)*info->begin);
 354
 355   for(i=info->begin,l=0;i<info->end;){
 356     /* fetch the partition word for each channel */
 357     for(j=0;j<ch;j++){
 358       int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
 359       if(temp==-1)goto eopbreak;
 360       partword[j]=look->decodemap[temp];
 361       if(partword[j]==NULL)goto errout;
 362     }
 363
 364     /* now we decode interleaved residual values for the partitions */
 365     for(k=0;k<partitions_per_word;k++,l++,i+=samples_per_partition)
 366       for(j=0;j<ch;j++){
 367         int part=partword[j][k];
 368         if(_decodepart(&vb->opb,work,in[j]+i,samples_per_partition,
 369                     info->secondstages[part],
 370                        look->partbooks[part])==-1)goto eopbreak;
 371       }
 372   }
 373
 374  eopbreak:
 375   if(i<transend){
 376     for(j=0;j<ch;j++)
 377       memset(in[j]+i,0,sizeof(float)*(transend-i));
 378   }
 379
 380   return(0);
 381
 382  errout:
 383   for(j=0;j<ch;j++)
 384     memset(in[j],0,sizeof(float)*transend);
 385   return(0);
 386 }
 387
 388 vorbis_func_residue residue0_exportbundle={
 389   &res0_pack,
 390   &res0_unpack,
 391   &res0_look,
 392   &res0_copy_info,
 393   &res0_free_info,
 394   &res0_free_look,
 395   &res0_forward,
 396   &res0_inverse
 397 };