/********************************************************************
* *
* 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.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);
for(j=0;j<info->partitions;j++){
int cascade=oggpack_read(opb,3);
if(oggpack_read(opb,1))
cascade|=(oggpack_read(opb,5)<<3);
info->secondstages[j]=cascade;
acc+=icount(cascade);
}
for(j=0;j<acc;j++)
info->booklist[j]=oggpack_read(opb,8);
if(info->groupbook>=ci->books)goto errout;
for(j=0;j<acc;j++)
if(info->booklist[j]>=ci->books)goto errout;
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)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)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
};