misc/libtremor/res012.c
author orange.hg@gmail.com
Sat, 25 Jun 2011 15:10:08 +0000
changeset 5312 85df559b85cd
parent 5170 f7e49eff3708
permissions -rw-r--r--
de nombreux petits changements : -quelques fautes d'accent -remplacement de mots que je trouvais mieux appropriés -reformulation de phrases dont la traduction était trop littéraire.
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/********************************************************************
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 *                                                                  *
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 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
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 *                                                                  *
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 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
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 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
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 *                                                                  *
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 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
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 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
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 *                                                                  *
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 ********************************************************************
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 function: residue backend 0, 1 and 2 implementation
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 ********************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "ogg.h"
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#include "ivorbiscodec.h"
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#include "codec_internal.h"
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#include "registry.h"
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#include "codebook.h"
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#include "misc.h"
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#include "os.h"
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#include "block.h"
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typedef struct {
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  vorbis_info_residue0 *info;
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  int         map;
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  int         parts;
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  int         stages;
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  codebook   *fullbooks;
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  codebook   *phrasebook;
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  codebook ***partbooks;
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  int         partvals;
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  int       **decodemap;
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} vorbis_look_residue0;
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void res0_free_info(vorbis_info_residue *i){
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  vorbis_info_residue0 *info=(vorbis_info_residue0 *)i;
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  if(info){
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    memset(info,0,sizeof(*info));
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    _ogg_free(info);
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  }
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}
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void res0_free_look(vorbis_look_residue *i){
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  int j;
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  if(i){
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    vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
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    for(j=0;j<look->parts;j++)
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      if(look->partbooks[j])_ogg_free(look->partbooks[j]);
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    _ogg_free(look->partbooks);
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    for(j=0;j<look->partvals;j++)
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      _ogg_free(look->decodemap[j]);
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    _ogg_free(look->decodemap);
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    memset(look,0,sizeof(*look));
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    _ogg_free(look);
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  }
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}
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static int ilog(unsigned int v){
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  int ret=0;
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  while(v){
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    ret++;
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    v>>=1;
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  }
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  return(ret);
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}
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static int icount(unsigned int v){
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  int ret=0;
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  while(v){
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    ret+=v&1;
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    v>>=1;
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  }
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  return(ret);
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}
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/* vorbis_info is for range checking */
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vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
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  int j,acc=0;
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  vorbis_info_residue0 *info=(vorbis_info_residue0 *)_ogg_calloc(1,sizeof(*info));
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  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
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  info->begin=oggpack_read(opb,24);
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  info->end=oggpack_read(opb,24);
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  info->grouping=oggpack_read(opb,24)+1;
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  info->partitions=oggpack_read(opb,6)+1;
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  info->groupbook=oggpack_read(opb,8);
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  for(j=0;j<info->partitions;j++){
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    int cascade=oggpack_read(opb,3);
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    if(oggpack_read(opb,1))
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      cascade|=(oggpack_read(opb,5)<<3);
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    info->secondstages[j]=cascade;
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    acc+=icount(cascade);
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  }
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  for(j=0;j<acc;j++)
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    info->booklist[j]=oggpack_read(opb,8);
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  if(info->groupbook>=ci->books)goto errout;
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  for(j=0;j<acc;j++)
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    if(info->booklist[j]>=ci->books)goto errout;
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  return(info);
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 errout:
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  res0_free_info(info);
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  return(NULL);
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}
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vorbis_look_residue *res0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
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			  vorbis_info_residue *vr){
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  vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
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  vorbis_look_residue0 *look=(vorbis_look_residue0 *)_ogg_calloc(1,sizeof(*look));
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  codec_setup_info     *ci=(codec_setup_info *)vd->vi->codec_setup;
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  int j,k,acc=0;
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  int dim;
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  int maxstage=0;
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  look->info=info;
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  look->map=vm->mapping;
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  look->parts=info->partitions;
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  look->fullbooks=ci->fullbooks;
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  look->phrasebook=ci->fullbooks+info->groupbook;
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  dim=look->phrasebook->dim;
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  look->partbooks=(codebook ***)_ogg_calloc(look->parts,sizeof(*look->partbooks));
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  for(j=0;j<look->parts;j++){
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    int stages=ilog(info->secondstages[j]);
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   143
    if(stages){
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      if(stages>maxstage)maxstage=stages;
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      look->partbooks[j]=(codebook **)_ogg_calloc(stages,sizeof(*look->partbooks[j]));
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      for(k=0;k<stages;k++)
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	if(info->secondstages[j]&(1<<k)){
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	  look->partbooks[j][k]=ci->fullbooks+info->booklist[acc++];
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#ifdef TRAIN_RES
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	  look->training_data[k][j]=calloc(look->partbooks[j][k]->entries,
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					   sizeof(***look->training_data));
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#endif
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	}
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    }
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  }
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  look->partvals=look->parts;
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  for(j=1;j<dim;j++)look->partvals*=look->parts;
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  look->stages=maxstage;
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  look->decodemap=(int **)_ogg_malloc(look->partvals*sizeof(*look->decodemap));
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  for(j=0;j<look->partvals;j++){
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    long val=j;
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    long mult=look->partvals/look->parts;
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    look->decodemap[j]=(int *)_ogg_malloc(dim*sizeof(*look->decodemap[j]));
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    for(k=0;k<dim;k++){
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      long deco=val/mult;
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      val-=deco*mult;
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      mult/=look->parts;
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      look->decodemap[j][k]=deco;
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   170
    }
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  }
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  return(look);
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   174
}
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   175
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/* a truncated packet here just means 'stop working'; it's not an error */
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static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
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		      ogg_int32_t **in,int ch,
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		      long (*decodepart)(codebook *, ogg_int32_t *, 
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					 oggpack_buffer *,int,int)){
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   182
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  long i,j,k,l,s;
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  vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
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  vorbis_info_residue0 *info=look->info;
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  /* move all this setup out later */
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  int samples_per_partition=info->grouping;
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  int partitions_per_word=look->phrasebook->dim;
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  int max=vb->pcmend>>1;
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  int end=(info->end<max?info->end:max);
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  int n=end-info->begin;
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   193
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  if(n>0){
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    int partvals=n/samples_per_partition;
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    int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
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    int ***partword=(int ***)alloca(ch*sizeof(*partword));
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   198
    
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   199
    for(j=0;j<ch;j++)
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      partword[j]=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));
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   201
    
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   202
    for(s=0;s<look->stages;s++){
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   203
      
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      /* each loop decodes on partition codeword containing 
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	 partitions_pre_word partitions */
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      for(i=0,l=0;i<partvals;l++){
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   207
	if(s==0){
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	  /* fetch the partition word for each channel */
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	  for(j=0;j<ch;j++){
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	    int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
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   211
	    if(temp==-1)goto eopbreak;
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	    partword[j][l]=look->decodemap[temp];
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   213
	    if(partword[j][l]==NULL)goto errout;
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   214
	  }
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   215
	}
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   216
	
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	/* now we decode residual values for the partitions */
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	for(k=0;k<partitions_per_word && i<partvals;k++,i++)
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   219
	  for(j=0;j<ch;j++){
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	    long offset=info->begin+i*samples_per_partition;
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   221
	    if(info->secondstages[partword[j][l][k]]&(1<<s)){
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	      codebook *stagebook=look->partbooks[partword[j][l][k]][s];
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   223
	      if(stagebook){
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   224
		if(decodepart(stagebook,in[j]+offset,&vb->opb,
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   225
			      samples_per_partition,-8)==-1)goto eopbreak;
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   226
	      }
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   227
	    }
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   228
	  }
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   229
      } 
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   230
    }
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   231
  }
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   232
 errout:
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   233
 eopbreak:
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   234
  return(0);
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   235
}
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   236
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   237
int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
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   238
		 ogg_int32_t **in,int *nonzero,int ch){
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   239
  int i,used=0;
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   240
  for(i=0;i<ch;i++)
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   241
    if(nonzero[i])
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   242
      in[used++]=in[i];
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   243
  if(used)
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   244
    return(_01inverse(vb,vl,in,used,vorbis_book_decodevs_add));
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   245
  else
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   246
    return(0);
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   247
}
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   248
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   249
int res1_inverse(vorbis_block *vb,vorbis_look_residue *vl,
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   250
		 ogg_int32_t **in,int *nonzero,int ch){
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   251
  int i,used=0;
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   252
  for(i=0;i<ch;i++)
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   253
    if(nonzero[i])
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   254
      in[used++]=in[i];
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   255
  if(used)
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   256
    return(_01inverse(vb,vl,in,used,vorbis_book_decodev_add));
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   257
  else
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   258
    return(0);
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   259
}
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   260
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   261
/* duplicate code here as speed is somewhat more important */
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int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
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   263
		 ogg_int32_t **in,int *nonzero,int ch){
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   264
  long i,k,l,s;
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   265
  vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
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   266
  vorbis_info_residue0 *info=look->info;
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   267
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  /* move all this setup out later */
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  int samples_per_partition=info->grouping;
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  int partitions_per_word=look->phrasebook->dim;
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  int max=(vb->pcmend*ch)>>1;
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  int end=(info->end<max?info->end:max);
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  int n=end-info->begin;
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  if(n>0){
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    int partvals=n/samples_per_partition;
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    int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
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    int **partword=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword));
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    int beginoff=info->begin/ch;
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    for(i=0;i<ch;i++)if(nonzero[i])break;
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    if(i==ch)return(0); /* no nonzero vectors */
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    samples_per_partition/=ch;
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    for(s=0;s<look->stages;s++){
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      for(i=0,l=0;i<partvals;l++){
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	if(s==0){
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	  /* fetch the partition word */
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	  int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
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	  if(temp==-1)goto eopbreak;
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	  partword[l]=look->decodemap[temp];
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	  if(partword[l]==NULL)goto errout;
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	}
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	/* now we decode residual values for the partitions */
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	for(k=0;k<partitions_per_word && i<partvals;k++,i++)
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	  if(info->secondstages[partword[l][k]]&(1<<s)){
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	    codebook *stagebook=look->partbooks[partword[l][k]][s];
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	    if(stagebook){
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	      if(vorbis_book_decodevv_add(stagebook,in,
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					  i*samples_per_partition+beginoff,ch,
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					  &vb->opb,
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					  samples_per_partition,-8)==-1)
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		goto eopbreak;
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	    }
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	  }
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      } 
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    }
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  }
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 errout:
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 eopbreak:
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  return(0);
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}
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vorbis_func_residue residue0_exportbundle={
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  &res0_unpack,
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  &res0_look,
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  &res0_free_info,
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  &res0_free_look,
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  &res0_inverse
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   326
};
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   327
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vorbis_func_residue residue1_exportbundle={
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   329
  &res0_unpack,
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   330
  &res0_look,
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   331
  &res0_free_info,
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  &res0_free_look,
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  &res1_inverse
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   334
};
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vorbis_func_residue residue2_exportbundle={
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   337
  &res0_unpack,
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   338
  &res0_look,
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  &res0_free_info,
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   340
  &res0_free_look,
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   341
  &res2_inverse
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   342
};