The Tor Browser: media/libtremor/lib/tremor_res012.c@6474c204b198 (annotated)

media/libtremor/lib/tremor_res012.c@6474c204b198 (annotated)

media/libtremor/lib/tremor_res012.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /********************************************************************
  *                                                                  *
  * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
  * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
  *                                                                  *
  ********************************************************************
  function: residue backend 0, 1 and 2 implementation
  ********************************************************************/
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <ogg/ogg.h>
 #include "ivorbiscodec.h"
 #include "codec_internal.h"
 #include "registry.h"
 #include "codebook.h"
 #include "misc.h"
 #include "os.h"
 #include "block.h"
 typedef struct {
   vorbis_info_residue0 *info;
   int         map;
   int         parts;
   int         stages;
   codebook   *fullbooks;
   codebook   *phrasebook;
   codebook ***partbooks;
   int         partvals;
   int       **decodemap;
 } 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;
     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);
 }
 /* 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=(vorbis_info_residue0 *)_ogg_calloc(1,sizeof(*info));
   codec_setup_info     *ci=(codec_setup_info *)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_mode *vm,
 			  vorbis_info_residue *vr){
   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
   vorbis_look_residue0 *look=(vorbis_look_residue0 *)_ogg_calloc(1,sizeof(*look));
   codec_setup_info     *ci=(codec_setup_info *)vd->vi->codec_setup;
   int j,k,acc=0;
   int dim;
   int maxstage=0;
   look->info=info;
   look->map=vm->mapping;
   look->parts=info->partitions;
   look->fullbooks=ci->fullbooks;
   look->phrasebook=ci->fullbooks+info->groupbook;
   dim=look->phrasebook->dim;
   look->partbooks=(codebook ***)_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]=(codebook **)_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]=calloc(look->partbooks[j][k]->entries,
 					   sizeof(***look->training_data));
 #endif
 	}
     }
   }
   look->partvals=look->parts;
   for(j=1;j<dim;j++)look->partvals*=look->parts;
   look->stages=maxstage;
   look->decodemap=(int **)_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]=(int *)_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;
     }
   }
   return(look);
 }
 /* a truncated packet here just means 'stop working'; it's not an error */
 static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
 		      ogg_int32_t **in,int ch,
 		      long (*decodepart)(codebook *, ogg_int32_t *,
 					 oggpack_buffer *,int,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=(int ***)alloca(ch*sizeof(*partword));
     for(j=0;j<ch;j++)
       partword[j]=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));
     for(s=0;s<look->stages;s++){
       /* each loop decodes on partition codeword containing
 	 partitions_pre_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,-8)==-1)goto eopbreak;
 	      }
 	    }
 	  }
       }
     }
   }
  errout:
  eopbreak:
   return(0);
 }
 int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 		 ogg_int32_t **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_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 		 ogg_int32_t **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);
 }
 /* duplicate code here as speed is somewhat more important */
 int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 		 ogg_int32_t **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=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword));
     int beginoff=info->begin/ch;
     for(i=0;i<ch;i++)if(nonzero[i])break;
     if(i==ch)return(0); /* no nonzero vectors */
     samples_per_partition/=ch;
     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+beginoff,ch,
 					  &vb->opb,
 					  samples_per_partition,-8)==-1)
 		goto eopbreak;
 	    }
 	  }
       }
     }
   }
  errout:
  eopbreak:
   return(0);
 }
 vorbis_func_residue residue0_exportbundle={
   &res0_unpack,
   &res0_look,
   &res0_free_info,
   &res0_free_look,
   &res0_inverse
 };
 vorbis_func_residue residue1_exportbundle={
   &res0_unpack,
   &res0_look,
   &res0_free_info,
   &res0_free_look,
   &res1_inverse
 };
 vorbis_func_residue residue2_exportbundle={
   &res0_unpack,
   &res0_look,
   &res0_free_info,
   &res0_free_look,
   &res2_inverse
 };

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media/libtremor/lib/tremor_res012.c@6474c204b198 (annotated)

media/libtremor/lib/tremor_res012.c