* 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 1994-2002 *
- * by the XIPHOPHORUS Company http://www.xiph.org/ *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 *
+ * by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function: floor backend 0 implementation
- last mod: $Id: floor0.c,v 1.52 2002/06/28 22:19:35 xiphmont Exp $
********************************************************************/
int n[2];
vorbis_info_floor0 *vi;
- lpc_lookup lpclook;
- float *lsp_look;
long bits;
long frames;
_ogg_free(look->linearmap);
}
- if(look->lsp_look)_ogg_free(look->lsp_look);
- lpc_clear(&look->lpclook);
memset(look,0,sizeof(*look));
_ogg_free(look);
}
info->ampbits=oggpack_read(opb,6);
info->ampdB=oggpack_read(opb,8);
info->numbooks=oggpack_read(opb,4)+1;
-
+
if(info->order<1)goto err_out;
if(info->rate<1)goto err_out;
if(info->barkmap<1)goto err_out;
if(info->numbooks<1)goto err_out;
-
+
for(j=0;j<info->numbooks;j++){
info->books[j]=oggpack_read(opb,8);
if(info->books[j]<0 || info->books[j]>=ci->books)goto err_out;
+ if(ci->book_param[info->books[j]]->maptype==0)goto err_out;
+ if(ci->book_param[info->books[j]]->dim<1)goto err_out;
}
return(info);
linear block and mapping sizes */
static void floor0_map_lazy_init(vorbis_block *vb,
- vorbis_info_floor *infoX,
- vorbis_look_floor0 *look){
+ vorbis_info_floor *infoX,
+ vorbis_look_floor0 *look){
if(!look->linearmap[vb->W]){
vorbis_dsp_state *vd=vb->vd;
vorbis_info *vi=vd->vi;
floor(bark(rate/2-1)*C)=mapped-1
floor(bark(rate/2)*C)=mapped */
float scale=look->ln/toBARK(info->rate/2.f);
-
+
/* the mapping from a linear scale to a smaller bark scale is
straightforward. We do *not* make sure that the linear mapping
does not skip bark-scale bins; the decoder simply skips them and
accurate */
look->linearmap[W]=_ogg_malloc((n+1)*sizeof(**look->linearmap));
for(j=0;j<n;j++){
- int val=floor( toBARK((info->rate/2.f)/n*j)
- *scale); /* bark numbers represent band edges */
+ int val=floor( toBARK((info->rate/2.f)/n*j)
+ *scale); /* bark numbers represent band edges */
if(val>=look->ln)val=look->ln-1; /* guard against the approximation */
look->linearmap[W][j]=val;
}
}
static vorbis_look_floor *floor0_look(vorbis_dsp_state *vd,
- vorbis_info_floor *i){
- int j;
+ vorbis_info_floor *i){
vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
vorbis_look_floor0 *look=_ogg_calloc(1,sizeof(*look));
+
+ (void)vd;
+
look->m=info->order;
look->ln=info->barkmap;
look->vi=info;
- if(vd->analysisp)
- lpc_init(&look->lpclook,look->ln,look->m);
-
look->linearmap=_ogg_calloc(2,sizeof(*look->linearmap));
- look->lsp_look=_ogg_malloc(look->ln*sizeof(*look->lsp_look));
- for(j=0;j<look->ln;j++)
- look->lsp_look[j]=2*cos(M_PI/look->ln*j);
-
return look;
}
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));
-
+ int booknum=oggpack_read(&vb->opb,ov_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;
- float *lsp=_vorbis_block_alloc(vb,sizeof(*lsp)*(look->m+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;
+
+ /* 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));
+
+ if(vorbis_book_decodev_set(b,lsp,&vb->opb,look->m)==-1)goto eop;
for(j=0;j<look->m;){
- for(k=0;k<b->dim;k++,j++)lsp[j]+=last;
- last=lsp[j-1];
+ for(k=0;j<look->m && k<b->dim;k++,j++)lsp[j]+=last;
+ last=lsp[j-1];
}
-
+
lsp[look->m]=amp;
return(lsp);
}
}
static int floor0_inverse2(vorbis_block *vb,vorbis_look_floor *i,
- void *memo,float *out){
+ void *memo,float *out){
vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
vorbis_info_floor0 *info=look->vi;
-
+
floor0_map_lazy_init(vb,info,look);
if(memo){
/* take the coefficients back to a spectral envelope curve */
vorbis_lsp_to_curve(out,
- look->linearmap[vb->W],
- look->n[vb->W],
- look->ln,
- lsp,look->m,amp,(float)info->ampdB);
+ look->linearmap[vb->W],
+ look->n[vb->W],
+ look->ln,
+ lsp,look->m,amp,(float)info->ampdB);
return(1);
}
memset(out,0,sizeof(*out)*look->n[vb->W]);
}
/* export hooks */
-vorbis_func_floor floor0_exportbundle={
+const vorbis_func_floor floor0_exportbundle={
NULL,&floor0_unpack,&floor0_look,&floor0_free_info,
&floor0_free_look,&floor0_inverse1,&floor0_inverse2
};
-
-
-