224 lines
6.7 KiB
C
224 lines
6.7 KiB
C
/********************************************************************
|
|
* *
|
|
* 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 1994-2015 *
|
|
* by the Xiph.Org Foundation http://www.xiph.org/ *
|
|
* *
|
|
********************************************************************
|
|
|
|
function: floor backend 0 implementation
|
|
|
|
********************************************************************/
|
|
|
|
#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 "lpc.h"
|
|
#include "lsp.h"
|
|
#include "codebook.h"
|
|
#include "scales.h"
|
|
#include "misc.h"
|
|
#include "os.h"
|
|
|
|
#include "misc.h"
|
|
#include <stdio.h>
|
|
|
|
typedef struct {
|
|
int ln;
|
|
int m;
|
|
int **linearmap;
|
|
int n[2];
|
|
|
|
vorbis_info_floor0 *vi;
|
|
|
|
long bits;
|
|
long frames;
|
|
} vorbis_look_floor0;
|
|
|
|
|
|
/***********************************************/
|
|
|
|
static void floor0_free_info(vorbis_info_floor *i){
|
|
vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
|
|
if(info){
|
|
memset(info,0,sizeof(*info));
|
|
_ogg_free(info);
|
|
}
|
|
}
|
|
|
|
static void floor0_free_look(vorbis_look_floor *i){
|
|
vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
|
|
if(look){
|
|
|
|
if(look->linearmap){
|
|
|
|
if(look->linearmap[0])_ogg_free(look->linearmap[0]);
|
|
if(look->linearmap[1])_ogg_free(look->linearmap[1]);
|
|
|
|
_ogg_free(look->linearmap);
|
|
}
|
|
memset(look,0,sizeof(*look));
|
|
_ogg_free(look);
|
|
}
|
|
}
|
|
|
|
static vorbis_info_floor *floor0_unpack (vorbis_info *vi,oggpack_buffer *opb){
|
|
codec_setup_info *ci=vi->codec_setup;
|
|
int j;
|
|
|
|
vorbis_info_floor0 *info=_ogg_malloc(sizeof(*info));
|
|
info->order=oggpack_read(opb,8);
|
|
info->rate=oggpack_read(opb,16);
|
|
info->barkmap=oggpack_read(opb,16);
|
|
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);
|
|
|
|
err_out:
|
|
floor0_free_info(info);
|
|
return(NULL);
|
|
}
|
|
|
|
/* initialize Bark scale and normalization lookups. We could do this
|
|
with static tables, but Vorbis allows a number of possible
|
|
combinations, so it's best to do it computationally.
|
|
|
|
The below is authoritative in terms of defining scale mapping.
|
|
Note that the scale depends on the sampling rate as well as the
|
|
linear block and mapping sizes */
|
|
|
|
static void floor0_map_lazy_init(vorbis_block *vb,
|
|
vorbis_info_floor *infoX,
|
|
vorbis_look_floor0 *look){
|
|
if(!look->linearmap[vb->W]){
|
|
vorbis_dsp_state *vd=vb->vd;
|
|
vorbis_info *vi=vd->vi;
|
|
codec_setup_info *ci=vi->codec_setup;
|
|
vorbis_info_floor0 *info=(vorbis_info_floor0 *)infoX;
|
|
int W=vb->W;
|
|
int n=ci->blocksizes[W]/2,j;
|
|
|
|
/* we choose a scaling constant so that:
|
|
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
|
|
the encoder may do what it wishes in filling them. They're
|
|
necessary in some mapping combinations to keep the scale spacing
|
|
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 */
|
|
if(val>=look->ln)val=look->ln-1; /* guard against the approximation */
|
|
look->linearmap[W][j]=val;
|
|
}
|
|
look->linearmap[W][j]=-1;
|
|
look->n[W]=n;
|
|
}
|
|
}
|
|
|
|
static vorbis_look_floor *floor0_look(vorbis_dsp_state *vd,
|
|
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;
|
|
|
|
look->linearmap=_ogg_calloc(2,sizeof(*look->linearmap));
|
|
|
|
return look;
|
|
}
|
|
|
|
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,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;
|
|
|
|
/* 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;j<look->m && k<b->dim;k++,j++)lsp[j]+=last;
|
|
last=lsp[j-1];
|
|
}
|
|
|
|
lsp[look->m]=amp;
|
|
return(lsp);
|
|
}
|
|
}
|
|
eop:
|
|
return(NULL);
|
|
}
|
|
|
|
static int floor0_inverse2(vorbis_block *vb,vorbis_look_floor *i,
|
|
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){
|
|
float *lsp=(float *)memo;
|
|
float amp=lsp[look->m];
|
|
|
|
/* 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);
|
|
return(1);
|
|
}
|
|
memset(out,0,sizeof(*out)*look->n[vb->W]);
|
|
return(0);
|
|
}
|
|
|
|
/* export hooks */
|
|
const vorbis_func_floor floor0_exportbundle={
|
|
NULL,&floor0_unpack,&floor0_look,&floor0_free_info,
|
|
&floor0_free_look,&floor0_inverse1,&floor0_inverse2
|
|
};
|