mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/media/libvorbis/lib/vorbis_res0.c

891 строка
24 KiB
C
Исходник Ответственный История

/********************************************************************
* *
* 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 19441 2015-01-21 01:17:41Z xiphmont $
********************************************************************/
/* 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 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(ov_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=ov_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
};
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку