godotengine/godot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
9f26733b44
godot/thirdparty/libvorbis/res0.c
Rémi Verschelde d9a291f641 ogg/vorbis/opus: Make them modules and unbundle thirdparty libs 
Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.

TODO: Fix the platform/ stuff for opus.
2016-10-15 11:50:40 +02:00

891 lines
24 KiB
C
Raw Blame History

/********************************************************************
* *
* 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
};
Reference in New Issue View Git Blame Copy Permalink