The Tor Browser: media/libvorbis/lib/vorbis_res0.c@b8a032363ba2 (annotated)

media/libvorbis/lib/vorbis_res0.c@b8a032363ba2 (annotated)

media/libvorbis/lib/vorbis_res0.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /********************************************************************
  *                                                                  *
  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
  *                                                                  *
  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2010             *
  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  *                                                                  *
  ********************************************************************
  function: residue backend 0, 1 and 2 implementation
  last mod: $Id: res0.c 19031 2013-12-03 19:20:50Z tterribe $
  ********************************************************************/
 /* Slow, slow, slow, simpleminded and did I mention it was slow?  The
    encode/decode loops are coded for clarity and performance is not
    yet even a nagging little idea lurking in the shadows.  Oh and BTW,
    it's slow. */
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <ogg/ogg.h>
 #include "vorbis/codec.h"
 #include "codec_internal.h"
 #include "registry.h"
 #include "codebook.h"
 #include "misc.h"
 #include "os.h"
 //#define TRAIN_RES 1
 //#define TRAIN_RESAUX 1
 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
 #include <stdio.h>
 #endif
 typedef struct {
   vorbis_info_residue0 *info;
   int         parts;
   int         stages;
   codebook   *fullbooks;
   codebook   *phrasebook;
   codebook ***partbooks;
   int         partvals;
   int       **decodemap;
   long      postbits;
   long      phrasebits;
   long      frames;
 #if defined(TRAIN_RES) || defined(TRAIN_RESAUX)
   int        train_seq;
   long      *training_data[8][64];
   float      training_max[8][64];
   float      training_min[8][64];
   float     tmin;
   float     tmax;
   int       submap;
 #endif
 } vorbis_look_residue0;
 void res0_free_info(vorbis_info_residue *i){
   vorbis_info_residue0 *info=(vorbis_info_residue0 *)i;
   if(info){
     memset(info,0,sizeof(*info));
     _ogg_free(info);
   }
 }
 void res0_free_look(vorbis_look_residue *i){
   int j;
   if(i){
     vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
 #ifdef TRAIN_RES
     {
       int j,k,l;
       for(j=0;j<look->parts;j++){
         /*fprintf(stderr,"partition %d: ",j);*/
         for(k=0;k<8;k++)
           if(look->training_data[k][j]){
             char buffer[80];
             FILE *of;
             codebook *statebook=look->partbooks[j][k];
             /* long and short into the same bucket by current convention */
             sprintf(buffer,"res_sub%d_part%d_pass%d.vqd",look->submap,j,k);
             of=fopen(buffer,"a");
             for(l=0;l<statebook->entries;l++)
               fprintf(of,"%d:%ld\n",l,look->training_data[k][j][l]);
             fclose(of);
             /*fprintf(stderr,"%d(%.2f|%.2f) ",k,
               look->training_min[k][j],look->training_max[k][j]);*/
             _ogg_free(look->training_data[k][j]);
             look->training_data[k][j]=NULL;
           }
         /*fprintf(stderr,"\n");*/
       }
     }
     fprintf(stderr,"min/max residue: %g::%g\n",look->tmin,look->tmax);
     /*fprintf(stderr,"residue bit usage %f:%f (%f total)\n",
             (float)look->phrasebits/look->frames,
             (float)look->postbits/look->frames,
             (float)(look->postbits+look->phrasebits)/look->frames);*/
 #endif
     /*vorbis_info_residue0 *info=look->info;
     fprintf(stderr,
             "%ld frames encoded in %ld phrasebits and %ld residue bits "
             "(%g/frame) \n",look->frames,look->phrasebits,
             look->resbitsflat,
             (look->phrasebits+look->resbitsflat)/(float)look->frames);
     for(j=0;j<look->parts;j++){
       long acc=0;
       fprintf(stderr,"\t[%d] == ",j);
       for(k=0;k<look->stages;k++)
         if((info->secondstages[j]>>k)&1){
           fprintf(stderr,"%ld,",look->resbits[j][k]);
           acc+=look->resbits[j][k];
         }
       fprintf(stderr,":: (%ld vals) %1.2fbits/sample\n",look->resvals[j],
               acc?(float)acc/(look->resvals[j]*info->grouping):0);
     }
     fprintf(stderr,"\n");*/
     for(j=0;j<look->parts;j++)
       if(look->partbooks[j])_ogg_free(look->partbooks[j]);
     _ogg_free(look->partbooks);
     for(j=0;j<look->partvals;j++)
       _ogg_free(look->decodemap[j]);
     _ogg_free(look->decodemap);
     memset(look,0,sizeof(*look));
     _ogg_free(look);
   }
 }
 static int ilog(unsigned int v){
   int ret=0;
   while(v){
     ret++;
     v>>=1;
   }
   return(ret);
 }
 static int icount(unsigned int v){
   int ret=0;
   while(v){
     ret+=v&1;
     v>>=1;
   }
   return(ret);
 }
 void res0_pack(vorbis_info_residue *vr,oggpack_buffer *opb){
   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
   int j,acc=0;
   oggpack_write(opb,info->begin,24);
   oggpack_write(opb,info->end,24);
   oggpack_write(opb,info->grouping-1,24);  /* residue vectors to group and
                                              code with a partitioned book */
   oggpack_write(opb,info->partitions-1,6); /* possible partition choices */
   oggpack_write(opb,info->groupbook,8);  /* group huffman book */
   /* secondstages is a bitmask; as encoding progresses pass by pass, a
      bitmask of one indicates this partition class has bits to write
      this pass */
   for(j=0;j<info->partitions;j++){
     if(ilog(info->secondstages[j])>3){
       /* yes, this is a minor hack due to not thinking ahead */
       oggpack_write(opb,info->secondstages[j],3);
       oggpack_write(opb,1,1);
       oggpack_write(opb,info->secondstages[j]>>3,5);
     }else
       oggpack_write(opb,info->secondstages[j],4); /* trailing zero */
     acc+=icount(info->secondstages[j]);
   }
   for(j=0;j<acc;j++)
     oggpack_write(opb,info->booklist[j],8);
 }
 /* vorbis_info is for range checking */
 vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
   int j,acc=0;
   vorbis_info_residue0 *info=_ogg_calloc(1,sizeof(*info));
   codec_setup_info     *ci=vi->codec_setup;
   info->begin=oggpack_read(opb,24);
   info->end=oggpack_read(opb,24);
   info->grouping=oggpack_read(opb,24)+1;
   info->partitions=oggpack_read(opb,6)+1;
   info->groupbook=oggpack_read(opb,8);
   /* check for premature EOP */
   if(info->groupbook<0)goto errout;
   for(j=0;j<info->partitions;j++){
     int cascade=oggpack_read(opb,3);
     int cflag=oggpack_read(opb,1);
     if(cflag<0) goto errout;
     if(cflag){
       int c=oggpack_read(opb,5);
       if(c<0) goto errout;
       cascade|=(c<<3);
     }
     info->secondstages[j]=cascade;
     acc+=icount(cascade);
   }
   for(j=0;j<acc;j++){
     int book=oggpack_read(opb,8);
     if(book<0) goto errout;
     info->booklist[j]=book;
   }
   if(info->groupbook>=ci->books)goto errout;
   for(j=0;j<acc;j++){
     if(info->booklist[j]>=ci->books)goto errout;
     if(ci->book_param[info->booklist[j]]->maptype==0)goto errout;
   }
   /* verify the phrasebook is not specifying an impossible or
      inconsistent partitioning scheme. */
   /* modify the phrasebook ranging check from r16327; an early beta
      encoder had a bug where it used an oversized phrasebook by
      accident.  These files should continue to be playable, but don't
      allow an exploit */
   {
     int entries = ci->book_param[info->groupbook]->entries;
     int dim = ci->book_param[info->groupbook]->dim;
     int partvals = 1;
     if (dim<1) goto errout;
     while(dim>0){
       partvals *= info->partitions;
       if(partvals > entries) goto errout;
       dim--;
     }
     info->partvals = partvals;
   }
   return(info);
  errout:
   res0_free_info(info);
   return(NULL);
 }
 vorbis_look_residue *res0_look(vorbis_dsp_state *vd,
                                vorbis_info_residue *vr){
   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
   vorbis_look_residue0 *look=_ogg_calloc(1,sizeof(*look));
   codec_setup_info     *ci=vd->vi->codec_setup;
   int j,k,acc=0;
   int dim;
   int maxstage=0;
   look->info=info;
   look->parts=info->partitions;
   look->fullbooks=ci->fullbooks;
   look->phrasebook=ci->fullbooks+info->groupbook;
   dim=look->phrasebook->dim;
   look->partbooks=_ogg_calloc(look->parts,sizeof(*look->partbooks));
   for(j=0;j<look->parts;j++){
     int stages=ilog(info->secondstages[j]);
     if(stages){
       if(stages>maxstage)maxstage=stages;
       look->partbooks[j]=_ogg_calloc(stages,sizeof(*look->partbooks[j]));
       for(k=0;k<stages;k++)
         if(info->secondstages[j]&(1<<k)){
           look->partbooks[j][k]=ci->fullbooks+info->booklist[acc++];
 #ifdef TRAIN_RES
           look->training_data[k][j]=_ogg_calloc(look->partbooks[j][k]->entries,
                                            sizeof(***look->training_data));
 #endif
         }
     }
   }
   look->partvals=1;
   for(j=0;j<dim;j++)
       look->partvals*=look->parts;
   look->stages=maxstage;
   look->decodemap=_ogg_malloc(look->partvals*sizeof(*look->decodemap));
   for(j=0;j<look->partvals;j++){
     long val=j;
     long mult=look->partvals/look->parts;
     look->decodemap[j]=_ogg_malloc(dim*sizeof(*look->decodemap[j]));
     for(k=0;k<dim;k++){
       long deco=val/mult;
       val-=deco*mult;
       mult/=look->parts;
       look->decodemap[j][k]=deco;
     }
   }
 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
   {
     static int train_seq=0;
     look->train_seq=train_seq++;
   }
 #endif
   return(look);
 }
 /* break an abstraction and copy some code for performance purposes */
 static int local_book_besterror(codebook *book,int *a){
   int dim=book->dim;
   int i,j,o;
   int minval=book->minval;
   int del=book->delta;
   int qv=book->quantvals;
   int ze=(qv>>1);
   int index=0;
   /* assumes integer/centered encoder codebook maptype 1 no more than dim 8 */
   int p[8]={0,0,0,0,0,0,0,0};
   if(del!=1){
     for(i=0,o=dim;i<dim;i++){
       int v = (a[--o]-minval+(del>>1))/del;
       int m = (v<ze ? ((ze-v)<<1)-1 : ((v-ze)<<1));
       index = index*qv+ (m<0?0:(m>=qv?qv-1:m));
       p[o]=v*del+minval;
     }
   }else{
     for(i=0,o=dim;i<dim;i++){
       int v = a[--o]-minval;
       int m = (v<ze ? ((ze-v)<<1)-1 : ((v-ze)<<1));
       index = index*qv+ (m<0?0:(m>=qv?qv-1:m));
       p[o]=v*del+minval;
     }
   }
   if(book->c->lengthlist[index]<=0){
     const static_codebook *c=book->c;
     int best=-1;
     /* assumes integer/centered encoder codebook maptype 1 no more than dim 8 */
     int e[8]={0,0,0,0,0,0,0,0};
     int maxval = book->minval + book->delta*(book->quantvals-1);
     for(i=0;i<book->entries;i++){
       if(c->lengthlist[i]>0){
         int this=0;
         for(j=0;j<dim;j++){
           int val=(e[j]-a[j]);
           this+=val*val;
         }
         if(best==-1 || this<best){
           memcpy(p,e,sizeof(p));
           best=this;
           index=i;
         }
       }
       /* assumes the value patterning created by the tools in vq/ */
       j=0;
       while(e[j]>=maxval)
         e[j++]=0;
       if(e[j]>=0)
         e[j]+=book->delta;
       e[j]= -e[j];
     }
   }
   if(index>-1){
     for(i=0;i<dim;i++)
       *a++ -= p[i];
   }
   return(index);
 }
 #ifdef TRAIN_RES
 static int _encodepart(oggpack_buffer *opb,int *vec, int n,
                        codebook *book,long *acc){
 #else
 static int _encodepart(oggpack_buffer *opb,int *vec, int n,
                        codebook *book){
 #endif
   int i,bits=0;
   int dim=book->dim;
   int step=n/dim;
   for(i=0;i<step;i++){
     int entry=local_book_besterror(book,vec+i*dim);
 #ifdef TRAIN_RES
     if(entry>=0)
       acc[entry]++;
 #endif
     bits+=vorbis_book_encode(book,entry,opb);
   }
   return(bits);
 }
 static long **_01class(vorbis_block *vb,vorbis_look_residue *vl,
                        int **in,int ch){
   long i,j,k;
   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
   vorbis_info_residue0 *info=look->info;
   /* move all this setup out later */
   int samples_per_partition=info->grouping;
   int possible_partitions=info->partitions;
   int n=info->end-info->begin;
   int partvals=n/samples_per_partition;
   long **partword=_vorbis_block_alloc(vb,ch*sizeof(*partword));
   float scale=100./samples_per_partition;
   /* we find the partition type for each partition of each
      channel.  We'll go back and do the interleaved encoding in a
      bit.  For now, clarity */
   for(i=0;i<ch;i++){
     partword[i]=_vorbis_block_alloc(vb,n/samples_per_partition*sizeof(*partword[i]));
     memset(partword[i],0,n/samples_per_partition*sizeof(*partword[i]));
   }
   for(i=0;i<partvals;i++){
     int offset=i*samples_per_partition+info->begin;
     for(j=0;j<ch;j++){
       int max=0;
       int ent=0;
       for(k=0;k<samples_per_partition;k++){
         if(abs(in[j][offset+k])>max)max=abs(in[j][offset+k]);
         ent+=abs(in[j][offset+k]);
       }
       ent*=scale;
       for(k=0;k<possible_partitions-1;k++)
         if(max<=info->classmetric1[k] &&
            (info->classmetric2[k]<0 || ent<info->classmetric2[k]))
           break;
       partword[j][i]=k;
     }
   }
 #ifdef TRAIN_RESAUX
   {
     FILE *of;
     char buffer[80];
     for(i=0;i<ch;i++){
       sprintf(buffer,"resaux_%d.vqd",look->train_seq);
       of=fopen(buffer,"a");
       for(j=0;j<partvals;j++)
         fprintf(of,"%ld, ",partword[i][j]);
       fprintf(of,"\n");
       fclose(of);
     }
   }
 #endif
   look->frames++;
   return(partword);
 }
 /* designed for stereo or other modes where the partition size is an
    integer multiple of the number of channels encoded in the current
    submap */
 static long **_2class(vorbis_block *vb,vorbis_look_residue *vl,int **in,
                       int ch){
   long i,j,k,l;
   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
   vorbis_info_residue0 *info=look->info;
   /* move all this setup out later */
   int samples_per_partition=info->grouping;
   int possible_partitions=info->partitions;
   int n=info->end-info->begin;
   int partvals=n/samples_per_partition;
   long **partword=_vorbis_block_alloc(vb,sizeof(*partword));
 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
   FILE *of;
   char buffer[80];
 #endif
   partword[0]=_vorbis_block_alloc(vb,partvals*sizeof(*partword[0]));
   memset(partword[0],0,partvals*sizeof(*partword[0]));
   for(i=0,l=info->begin/ch;i<partvals;i++){
     int magmax=0;
     int angmax=0;
     for(j=0;j<samples_per_partition;j+=ch){
       if(abs(in[0][l])>magmax)magmax=abs(in[0][l]);
       for(k=1;k<ch;k++)
         if(abs(in[k][l])>angmax)angmax=abs(in[k][l]);
       l++;
     }
     for(j=0;j<possible_partitions-1;j++)
       if(magmax<=info->classmetric1[j] &&
          angmax<=info->classmetric2[j])
         break;
     partword[0][i]=j;
   }
 #ifdef TRAIN_RESAUX
   sprintf(buffer,"resaux_%d.vqd",look->train_seq);
   of=fopen(buffer,"a");
   for(i=0;i<partvals;i++)
     fprintf(of,"%ld, ",partword[0][i]);
   fprintf(of,"\n");
   fclose(of);
 #endif
   look->frames++;
   return(partword);
 }
 static int _01forward(oggpack_buffer *opb,
                       vorbis_look_residue *vl,
                       int **in,int ch,
                       long **partword,
 #ifdef TRAIN_RES
                       int (*encode)(oggpack_buffer *,int *,int,
                                     codebook *,long *),
                       int submap
 #else
                       int (*encode)(oggpack_buffer *,int *,int,
                                     codebook *)
 #endif
 ){
   long i,j,k,s;
   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
   vorbis_info_residue0 *info=look->info;
 #ifdef TRAIN_RES
   look->submap=submap;
 #endif
   /* move all this setup out later */
   int samples_per_partition=info->grouping;
   int possible_partitions=info->partitions;
   int partitions_per_word=look->phrasebook->dim;
   int n=info->end-info->begin;
   int partvals=n/samples_per_partition;
   long resbits[128];
   long resvals[128];
 #ifdef TRAIN_RES
   for(i=0;i<ch;i++)
     for(j=info->begin;j<info->end;j++){
       if(in[i][j]>look->tmax)look->tmax=in[i][j];
       if(in[i][j]<look->tmin)look->tmin=in[i][j];
     }
 #endif
   memset(resbits,0,sizeof(resbits));
   memset(resvals,0,sizeof(resvals));
   /* we code the partition words for each channel, then the residual
      words for a partition per channel until we've written all the
      residual words for that partition word.  Then write the next
      partition channel words... */
   for(s=0;s<look->stages;s++){
     for(i=0;i<partvals;){
       /* first we encode a partition codeword for each channel */
       if(s==0){
         for(j=0;j<ch;j++){
           long val=partword[j][i];
           for(k=1;k<partitions_per_word;k++){
             val*=possible_partitions;
             if(i+k<partvals)
               val+=partword[j][i+k];
           }
           /* training hack */
           if(val<look->phrasebook->entries)
             look->phrasebits+=vorbis_book_encode(look->phrasebook,val,opb);
 #if 0 /*def TRAIN_RES*/
           else
             fprintf(stderr,"!");
 #endif
         }
       }
       /* now we encode interleaved residual values for the partitions */
       for(k=0;k<partitions_per_word && i<partvals;k++,i++){
         long offset=i*samples_per_partition+info->begin;
         for(j=0;j<ch;j++){
           if(s==0)resvals[partword[j][i]]+=samples_per_partition;
           if(info->secondstages[partword[j][i]]&(1<<s)){
             codebook *statebook=look->partbooks[partword[j][i]][s];
             if(statebook){
               int ret;
 #ifdef TRAIN_RES
               long *accumulator=NULL;
               accumulator=look->training_data[s][partword[j][i]];
               {
                 int l;
                 int *samples=in[j]+offset;
                 for(l=0;l<samples_per_partition;l++){
                   if(samples[l]<look->training_min[s][partword[j][i]])
                     look->training_min[s][partword[j][i]]=samples[l];
                   if(samples[l]>look->training_max[s][partword[j][i]])
                     look->training_max[s][partword[j][i]]=samples[l];
                 }
               }
               ret=encode(opb,in[j]+offset,samples_per_partition,
                          statebook,accumulator);
 #else
               ret=encode(opb,in[j]+offset,samples_per_partition,
                          statebook);
 #endif
               look->postbits+=ret;
               resbits[partword[j][i]]+=ret;
             }
           }
         }
       }
     }
   }
   return(0);
 }
 /* a truncated packet here just means 'stop working'; it's not an error */
 static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
                       float **in,int ch,
                       long (*decodepart)(codebook *, float *,
                                          oggpack_buffer *,int)){
   long i,j,k,l,s;
   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
   vorbis_info_residue0 *info=look->info;
   /* move all this setup out later */
   int samples_per_partition=info->grouping;
   int partitions_per_word=look->phrasebook->dim;
   int max=vb->pcmend>>1;
   int end=(info->end<max?info->end:max);
   int n=end-info->begin;
   if(n>0){
     int partvals=n/samples_per_partition;
     int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
     int ***partword=alloca(ch*sizeof(*partword));
     for(j=0;j<ch;j++)
       partword[j]=_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));
     for(s=0;s<look->stages;s++){
       /* each loop decodes on partition codeword containing
          partitions_per_word partitions */
       for(i=0,l=0;i<partvals;l++){
         if(s==0){
           /* fetch the partition word for each channel */
           for(j=0;j<ch;j++){
             int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
             if(temp==-1 || temp>=info->partvals)goto eopbreak;
             partword[j][l]=look->decodemap[temp];
             if(partword[j][l]==NULL)goto errout;
           }
         }
         /* now we decode residual values for the partitions */
         for(k=0;k<partitions_per_word && i<partvals;k++,i++)
           for(j=0;j<ch;j++){
             long offset=info->begin+i*samples_per_partition;
             if(info->secondstages[partword[j][l][k]]&(1<<s)){
               codebook *stagebook=look->partbooks[partword[j][l][k]][s];
               if(stagebook){
                 if(decodepart(stagebook,in[j]+offset,&vb->opb,
                               samples_per_partition)==-1)goto eopbreak;
               }
             }
           }
       }
     }
   }
  errout:
  eopbreak:
   return(0);
 }
 int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
                  float **in,int *nonzero,int ch){
   int i,used=0;
   for(i=0;i<ch;i++)
     if(nonzero[i])
       in[used++]=in[i];
   if(used)
     return(_01inverse(vb,vl,in,used,vorbis_book_decodevs_add));
   else
     return(0);
 }
 int res1_forward(oggpack_buffer *opb,vorbis_block *vb,vorbis_look_residue *vl,
                  int **in,int *nonzero,int ch, long **partword, int submap){
   int i,used=0;
   (void)vb;
   for(i=0;i<ch;i++)
     if(nonzero[i])
       in[used++]=in[i];
   if(used){
 #ifdef TRAIN_RES
     return _01forward(opb,vl,in,used,partword,_encodepart,submap);
 #else
     (void)submap;
     return _01forward(opb,vl,in,used,partword,_encodepart);
 #endif
   }else{
     return(0);
   }
 }
 long **res1_class(vorbis_block *vb,vorbis_look_residue *vl,
                   int **in,int *nonzero,int ch){
   int i,used=0;
   for(i=0;i<ch;i++)
     if(nonzero[i])
       in[used++]=in[i];
   if(used)
     return(_01class(vb,vl,in,used));
   else
     return(0);
 }
 int res1_inverse(vorbis_block *vb,vorbis_look_residue *vl,
                  float **in,int *nonzero,int ch){
   int i,used=0;
   for(i=0;i<ch;i++)
     if(nonzero[i])
       in[used++]=in[i];
   if(used)
     return(_01inverse(vb,vl,in,used,vorbis_book_decodev_add));
   else
     return(0);
 }
 long **res2_class(vorbis_block *vb,vorbis_look_residue *vl,
                   int **in,int *nonzero,int ch){
   int i,used=0;
   for(i=0;i<ch;i++)
     if(nonzero[i])used++;
   if(used)
     return(_2class(vb,vl,in,ch));
   else
     return(0);
 }
 /* res2 is slightly more different; all the channels are interleaved
    into a single vector and encoded. */
 int res2_forward(oggpack_buffer *opb,
                  vorbis_block *vb,vorbis_look_residue *vl,
                  int **in,int *nonzero,int ch, long **partword,int submap){
   long i,j,k,n=vb->pcmend/2,used=0;
   /* don't duplicate the code; use a working vector hack for now and
      reshape ourselves into a single channel res1 */
   /* ugly; reallocs for each coupling pass :-( */
   int *work=_vorbis_block_alloc(vb,ch*n*sizeof(*work));
   for(i=0;i<ch;i++){
     int *pcm=in[i];
     if(nonzero[i])used++;
     for(j=0,k=i;j<n;j++,k+=ch)
       work[k]=pcm[j];
   }
   if(used){
 #ifdef TRAIN_RES
     return _01forward(opb,vl,&work,1,partword,_encodepart,submap);
 #else
     (void)submap;
     return _01forward(opb,vl,&work,1,partword,_encodepart);
 #endif
   }else{
     return(0);
   }
 }
 /* duplicate code here as speed is somewhat more important */
 int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
                  float **in,int *nonzero,int ch){
   long i,k,l,s;
   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
   vorbis_info_residue0 *info=look->info;
   /* move all this setup out later */
   int samples_per_partition=info->grouping;
   int partitions_per_word=look->phrasebook->dim;
   int max=(vb->pcmend*ch)>>1;
   int end=(info->end<max?info->end:max);
   int n=end-info->begin;
   if(n>0){
     int partvals=n/samples_per_partition;
     int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
     int **partword=_vorbis_block_alloc(vb,partwords*sizeof(*partword));
     for(i=0;i<ch;i++)if(nonzero[i])break;
     if(i==ch)return(0); /* no nonzero vectors */
     for(s=0;s<look->stages;s++){
       for(i=0,l=0;i<partvals;l++){
         if(s==0){
           /* fetch the partition word */
           int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
           if(temp==-1 || temp>=info->partvals)goto eopbreak;
           partword[l]=look->decodemap[temp];
           if(partword[l]==NULL)goto errout;
         }
         /* now we decode residual values for the partitions */
         for(k=0;k<partitions_per_word && i<partvals;k++,i++)
           if(info->secondstages[partword[l][k]]&(1<<s)){
             codebook *stagebook=look->partbooks[partword[l][k]][s];
             if(stagebook){
               if(vorbis_book_decodevv_add(stagebook,in,
                                           i*samples_per_partition+info->begin,ch,
                                           &vb->opb,samples_per_partition)==-1)
                 goto eopbreak;
             }
           }
       }
     }
   }
  errout:
  eopbreak:
   return(0);
 }
 const vorbis_func_residue residue0_exportbundle={
   NULL,
   &res0_unpack,
   &res0_look,
   &res0_free_info,
   &res0_free_look,
   NULL,
   NULL,
   &res0_inverse
 };
 const vorbis_func_residue residue1_exportbundle={
   &res0_pack,
   &res0_unpack,
   &res0_look,
   &res0_free_info,
   &res0_free_look,
   &res1_class,
   &res1_forward,
   &res1_inverse
 };
 const vorbis_func_residue residue2_exportbundle={
   &res0_pack,
   &res0_unpack,
   &res0_look,
   &res0_free_info,
   &res0_free_look,
   &res2_class,
   &res2_forward,
   &res2_inverse
 };

The Tor Browser / annotate

media/libvorbis/lib/vorbis_res0.c@b8a032363ba2 (annotated)

media/libvorbis/lib/vorbis_res0.c