static void *floor0_inverse1(vorbis_block *vb,vorbis_look_floor *i){
vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
vorbis_info_floor0 *info=look->vi;
int j,k;
int ampraw=oggpack_read(&vb->opb,info->ampbits);
if(ampraw>0){ /* also handles the -1 out of data case */
long maxval=(1<<info->ampbits)-1;
float amp=(float)ampraw/maxval*info->ampdB;
int booknum=oggpack_read(&vb->opb,_ilog(info->numbooks));
if(booknum!=-1 && booknum<info->numbooks){ /* be paranoid */
codec_setup_info *ci=vb->vd->vi->codec_setup;
codebook *b=ci->fullbooks+info->books[booknum];
float last=0.f;
/* the additional b->dim is a guard against any possible stack
smash; b->dim is provably more than we can overflow the
vector */
float *lsp=_vorbis_block_alloc(vb,sizeof(*lsp)*(look->m+b->dim+1));
for(j=0;j<look->m;j+=b->dim)
if(vorbis_book_decodev_set(b,lsp+j,&vb->opb,b->dim)==-1)goto eop;
for(j=0;j<look->m;){
for(k=0;k<b->dim;k++,j++)lsp[j]+=last;
last=lsp[j-1];
}
lsp[look->m]=amp;
return(lsp);
}
}
eop:
return(NULL);
}
static void *floor0_inverse1(vorbis_block *vb,vorbis_look_floor *i,unsigned int channel)
{
vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
vorbis_info_floor0 *info=look->vif0;
oggpack_buffer *vbopb=&vb->opb;
int j,k;
int ampraw=oggpack_read32(vbopb,info->ampbits);
if(ampraw>0){
long maxval=(1<<info->ampbits)-1;
ogg_double_t amp=(ogg_double_t)ampraw/maxval*info->ampdB;
int booknum=oggpack_read32(vbopb,_ilog(info->numbooks));
if((booknum>=0) && (booknum<info->numbooks)){
codec_setup_info *ci=vb->vd->vi->codec_setup;
codebook *b=ci->fullbooks+info->books[booknum];
int bookdim=b->dim;
ogg_double_t *lsp=look->lsp_data[channel];
if(vorbis_book_decodev_set(b,lsp,vbopb,bookdim)<0)
goto eop;
for(j=bookdim;j<look->m;){
ogg_double_t last;
if(vorbis_book_decodev_set(b,lsp+j,vbopb,bookdim)<0)
goto eop;
last=lsp[j-1];
for(k=0;k<bookdim;k++,j++)
lsp[j]+=last;
}
lsp[look->m]=amp;
return(lsp);
}
}
eop:
return(NULL);
}
