apps/codecs/libtremor/res012.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
   4  *                                                                  *
   5  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   6  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   7  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   8  *                                                                  *
   9  * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
  10  * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
  11  *                                                                  *
  12  ********************************************************************
  13
  14  function: residue backend 0, 1 and 2 implementation
  15
  16  ********************************************************************/
  17
  18 #include "config-tremor.h"
  19 #include <string.h>
  20 #include <math.h>
  21 #include "ogg.h"
  22 #include "ivorbiscodec.h"
  23 #include "codec_internal.h"
  24 #include "registry.h"
  25 #include "codebook.h"
  26 #include "misc.h"
  27 #include "os.h"
  28
  29 typedef struct {
  30   vorbis_info_residue0 *info;
  31   int         map;
  32
  33   int         parts;
  34   int         stages;
  35   codebook   *fullbooks;
  36   codebook   *phrasebook;
  37   codebook ***partbooks;
  38
  39   int         partvals;
  40   int       **decodemap;
  41
  42 } vorbis_look_residue0;
  43
  44 static void res0_free_info(vorbis_info_residue *i){
  45   vorbis_info_residue0 *info=(vorbis_info_residue0 *)i;
  46   if(info){
  47     memset(info,0,sizeof(*info));
  48     _ogg_free(info);
  49   }
  50 }
  51
  52 static void res0_free_look(vorbis_look_residue *i){
  53   int j;
  54   if(i){
  55
  56     vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
  57
  58     for(j=0;j<look->parts;j++)
  59       if(look->partbooks[j])_ogg_free(look->partbooks[j]);
  60     _ogg_free(look->partbooks);
  61     for(j=0;j<look->partvals;j++)
  62       _ogg_free(look->decodemap[j]);
  63     _ogg_free(look->decodemap);
  64
  65     memset(look,0,sizeof(*look));
  66     _ogg_free(look);
  67   }
  68 }
  69
  70 static int ilog(unsigned int v){
  71   int ret=0;
  72   while(v){
  73     ret++;
  74     v>>=1;
  75   }
  76   return(ret);
  77 }
  78
  79 static int icount(unsigned int v){
  80   int ret=0;
  81   while(v){
  82     ret+=v&1;
  83     v>>=1;
  84   }
  85   return(ret);
  86 }
  87
  88 /* vorbis_info is for range checking */
  89 static vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
  90   int j,acc=0;
  91   vorbis_info_residue0 *info=(vorbis_info_residue0 *)_ogg_calloc(1,sizeof(*info));
  92   codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
  93
  94   info->begin=oggpack_read(opb,24);
  95   info->end=oggpack_read(opb,24);
  96   info->grouping=oggpack_read(opb,24)+1;
  97   info->partitions=oggpack_read(opb,6)+1;
  98   info->groupbook=oggpack_read(opb,8);
  99
 100   /* check for premature EOP */
 101   if(info->groupbook<0)goto errout;
 102
 103   for(j=0;j<info->partitions;j++){
 104     int cascade=oggpack_read(opb,3);
 105     int cflag=oggpack_read(opb,1);
 106     if(cflag<0) goto errout;
 107     if(cflag){
 108       int c=oggpack_read(opb,5);
 109       if(c<0) goto errout;
 110       cascade|=(c<<3);
 111     }
 112     info->secondstages[j]=cascade;
 113
 114     acc+=icount(cascade);
 115   }
 116   for(j=0;j<acc;j++){
 117     int book=oggpack_read(opb,8);
 118     if(book<0) goto errout;
 119     info->booklist[j]=book;
 120   }
 121
 122   if(info->groupbook>=ci->books)goto errout;
 123   for(j=0;j<acc;j++){
 124     if(info->booklist[j]>=ci->books)goto errout;
 125     if(ci->book_param[info->booklist[j]]->maptype==0)goto errout;
 126   }
 127
 128   /* verify the phrasebook is not specifying an impossible or
 129      inconsistent partitioning scheme. */
 130   /* modify the phrasebook ranging check from r16327; an early beta
 131      encoder had a bug where it used an oversized phrasebook by
 132      accident.  These files should continue to be playable, but don't
 133      allow an exploit */
 134   {
 135     int entries = ci->book_param[info->groupbook]->entries;
 136     int dim = ci->book_param[info->groupbook]->dim;
 137     int partvals = 1;
 138     while(dim>0){
 139       partvals *= info->partitions;
 140       if(partvals > entries) goto errout;
 141       dim--;
 142     }
 143     info->partvals = partvals;
 144   }
 145
 146   return(info);
 147  errout:
 148   res0_free_info(info);
 149   return(NULL);
 150 }
 151
 152 static vorbis_look_residue *res0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
 153                                       vorbis_info_residue *vr){
 154   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
 155   vorbis_look_residue0 *look=(vorbis_look_residue0 *)_ogg_calloc(1,sizeof(*look));
 156   codec_setup_info     *ci=(codec_setup_info *)vd->vi->codec_setup;
 157
 158   int j,k,acc=0;
 159   int dim;
 160   int maxstage=0;
 161   look->info=info;
 162   look->map=vm->mapping;
 163
 164   look->parts=info->partitions;
 165   look->fullbooks=ci->fullbooks;
 166   look->phrasebook=ci->fullbooks+info->groupbook;
 167   dim=look->phrasebook->dim;
 168
 169   look->partbooks=(codebook ***)_ogg_calloc(look->parts,sizeof(*look->partbooks));
 170
 171   for(j=0;j<look->parts;j++){
 172     int stages=ilog(info->secondstages[j]);
 173     if(stages){
 174       if(stages>maxstage)maxstage=stages;
 175       look->partbooks[j]=(codebook **)_ogg_calloc(stages,sizeof(*look->partbooks[j]));
 176       for(k=0;k<stages;k++)
 177         if(info->secondstages[j]&(1<<k)){
 178           look->partbooks[j][k]=ci->fullbooks+info->booklist[acc++];
 179 #ifdef TRAIN_RES
 180           look->training_data[k][j]=calloc(look->partbooks[j][k]->entries,
 181                                            sizeof(***look->training_data));
 182 #endif
 183         }
 184     }
 185   }
 186
 187   look->partvals=look->parts;
 188   for(j=1;j<dim;j++)look->partvals*=look->parts;
 189   look->stages=maxstage;
 190   look->decodemap=(int **)_ogg_malloc(look->partvals*sizeof(*look->decodemap));
 191   for(j=0;j<look->partvals;j++){
 192     long val=j;
 193     long mult=look->partvals/look->parts;
 194     look->decodemap[j]=(int *)_ogg_malloc(dim*sizeof(*look->decodemap[j]));
 195     for(k=0;k<dim;k++){
 196       long deco=val/mult;
 197       val-=deco*mult;
 198       mult/=look->parts;
 199       look->decodemap[j][k]=deco;
 200     }
 201   }
 202
 203   return(look);
 204 }
 205
 206 /* a truncated packet here just means 'stop working'; it's not an error */
 207 static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
 208                       ogg_int32_t **in,int ch,
 209                       long (*decodepart)(codebook *, ogg_int32_t *,
 210                                          oggpack_buffer *,int,int)){
 211
 212   long i,j,k,l,s;
 213   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 214   vorbis_info_residue0 *info=look->info;
 215
 216   /* move all this setup out later */
 217   int samples_per_partition=info->grouping;
 218   int partitions_per_word=look->phrasebook->dim;
 219   int max=vb->pcmend>>1;
 220   int end=(info->end<max?info->end:max);
 221   int n=end-info->begin;
 222
 223   if(n>0){
 224     int partvals=n/samples_per_partition;
 225     int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
 226     int ***partword=(int ***)alloca(ch*sizeof(*partword));
 227
 228     for(j=0;j<ch;j++)
 229       partword[j]=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));
 230
 231     for(s=0;s<look->stages;s++){
 232
 233       /* each loop decodes on partition codeword containing
 234          partitions_pre_word partitions */
 235       for(i=0,l=0;i<partvals;l++){
 236         if(s==0){
 237           /* fetch the partition word for each channel */
 238           for(j=0;j<ch;j++){
 239             int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
 240             if(temp==-1 || temp>=info->partvals)goto eopbreak;
 241             partword[j][l]=look->decodemap[temp];
 242             if(partword[j][l]==NULL)goto errout;
 243           }
 244         }
 245
 246         /* now we decode residual values for the partitions */
 247         for(k=0;k<partitions_per_word && i<partvals;k++,i++)
 248           for(j=0;j<ch;j++){
 249             long offset=info->begin+i*samples_per_partition;
 250             if(info->secondstages[partword[j][l][k]]&(1<<s)){
 251               codebook *stagebook=look->partbooks[partword[j][l][k]][s];
 252               if(stagebook){
 253                 if(decodepart(stagebook,in[j]+offset,&vb->opb,
 254                               samples_per_partition,-8)==-1)goto eopbreak;
 255               }
 256             }
 257           }
 258       }
 259     }
 260   }
 261  errout:
 262  eopbreak:
 263   return(0);
 264 }
 265
 266 static int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 267                         ogg_int32_t **in,int *nonzero,int ch){
 268   int i,used=0;
 269   for(i=0;i<ch;i++)
 270     if(nonzero[i])
 271       in[used++]=in[i];
 272   if(used)
 273     return(_01inverse(vb,vl,in,used,vorbis_book_decodevs_add));
 274   else
 275     return(0);
 276 }
 277
 278 static int res1_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 279                         ogg_int32_t **in,int *nonzero,int ch){
 280   int i,used=0;
 281   for(i=0;i<ch;i++)
 282     if(nonzero[i])
 283       in[used++]=in[i];
 284   if(used)
 285     return(_01inverse(vb,vl,in,used,vorbis_book_decodev_add));
 286   else
 287     return(0);
 288 }
 289
 290 /* duplicate code here as speed is somewhat more important */
 291 int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 292                  ogg_int32_t **in,int *nonzero,int ch)
 293     ICODE_ATTR_TREMOR_NOT_MDCT;
 294 int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 295                  ogg_int32_t **in,int *nonzero,int ch){
 296   long i,k,l,s;
 297   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
 298   vorbis_info_residue0 *info=look->info;
 299
 300   /* move all this setup out later */
 301   int samples_per_partition=info->grouping;
 302   int partitions_per_word=look->phrasebook->dim;
 303   int max=(vb->pcmend*ch)>>1;
 304   int end=(info->end<max?info->end:max);
 305   int n=end-info->begin;
 306
 307   if(n>0){
 308
 309     int partvals=n/samples_per_partition;
 310     int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
 311     int **partword=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword));
 312     int beginoff=info->begin/ch;
 313
 314     for(i=0;i<ch;i++)if(nonzero[i])break;
 315     if(i==ch)return(0); /* no nonzero vectors */
 316
 317     samples_per_partition/=ch;
 318
 319     for(s=0;s<look->stages;s++){
 320       for(i=0,l=0;i<partvals;l++){
 321
 322         if(s==0){
 323           /* fetch the partition word */
 324           int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
 325           if(temp==-1 || temp>info->partvals)goto eopbreak;
 326           partword[l]=look->decodemap[temp];
 327           if(partword[l]==NULL)goto errout;
 328         }
 329
 330         /* now we decode residual values for the partitions */
 331         for(k=0;k<partitions_per_word && i<partvals;k++,i++)
 332           if(info->secondstages[partword[l][k]]&(1<<s)){
 333             codebook *stagebook=look->partbooks[partword[l][k]][s];
 334             if(stagebook){
 335               if(vorbis_book_decodevv_add(stagebook,in,
 336                                           i*samples_per_partition+beginoff,ch,
 337                                           &vb->opb,
 338                                           samples_per_partition,-8)==-1)
 339                 goto eopbreak;
 340             }
 341           }
 342       }
 343     }
 344   }
 345  errout:
 346  eopbreak:
 347   return(0);
 348 }
 349
 350
 351 const vorbis_func_residue residue0_exportbundle ICONST_ATTR ={
 352   &res0_unpack,
 353   &res0_look,
 354   &res0_free_info,
 355   &res0_free_look,
 356   &res0_inverse
 357 };
 358
 359 const vorbis_func_residue residue1_exportbundle ICONST_ATTR ={
 360   &res0_unpack,
 361   &res0_look,
 362   &res0_free_info,
 363   &res0_free_look,
 364   &res1_inverse
 365 };
 366
 367 const vorbis_func_residue residue2_exportbundle ICONST_ATTR ={
 368   &res0_unpack,
 369   &res0_look,
 370   &res0_free_info,
 371   &res0_free_look,
 372   &res2_inverse
 373 };