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floor0.c    428 lines (342 with data), 12.1 kB

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
* *
* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
* ALL REDISTRIBUTION RIGHTS RESERVED. *
* *
********************************************************************
function: floor backend 0 implementation
********************************************************************/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "ogg.h"
#include "ivorbiscodec.h"
#include "codec_internal.h"
#include "registry.h"
#include "codebook.h"
#include "misc.h"
#include "os.h"
#define LSP_FRACBITS 14
typedef struct {
long n;
int ln;
int m;
int *linearmap;
vorbis_info_floor0 *vi;
ogg_int32_t *lsp_look;
} vorbis_look_floor0;
/*************** LSP decode ********************/
#include "lsp_lookup.h"
/* interpolated 1./sqrt(p) where .5 <= a < 1. (.100000... to .111111...) in
16.16 format
returns in m.8 format */
static long ADJUST_SQRT2[2]={8192,5792};
static inline ogg_int32_t vorbis_invsqlook_i(long a,long e){
long i=(a&0x7fff)>>(INVSQ_LOOKUP_I_SHIFT-1);
long d=a&INVSQ_LOOKUP_I_MASK; /* 0.10 */
long val=INVSQ_LOOKUP_I[i]- /* 1.16 */
((INVSQ_LOOKUP_IDel[i]*d)>>INVSQ_LOOKUP_I_SHIFT); /* result 1.16 */
val*=ADJUST_SQRT2[e&1];
e=(e>>1)+21;
return(val>>e);
}
/* interpolated lookup based fromdB function, domain -140dB to 0dB only */
/* a is in n.12 format */
static inline ogg_int32_t vorbis_fromdBlook_i(long a){
int i=(-a)>>(12-FROMdB2_SHIFT);
if(i<0) return 0x7fffffff;
if(i>=(FROMdB_LOOKUP_SZ<<FROMdB_SHIFT))return 0;
return FROMdB_LOOKUP[i>>FROMdB_SHIFT] * FROMdB2_LOOKUP[i&FROMdB2_MASK];
}
/* interpolated lookup based cos function, domain 0 to PI only */
/* a is in 0.16 format, where 0==0, 2^^16-1==PI, return 0.14 */
static inline ogg_int32_t vorbis_coslook_i(long a){
int i=a>>COS_LOOKUP_I_SHIFT;
int d=a&COS_LOOKUP_I_MASK;
return COS_LOOKUP_I[i]- ((d*(COS_LOOKUP_I[i]-COS_LOOKUP_I[i+1]))>>
COS_LOOKUP_I_SHIFT);
}
/* interpolated lookup based cos function */
/* a is in 0.16 format, where 0==0, 2^^16==PI, return .LSP_FRACBITS */
static inline ogg_int32_t vorbis_coslook2_i(long a){
a=a&0x1ffff;
if(a>0x10000)a=0x20000-a;
{
int i=a>>COS_LOOKUP_I_SHIFT;
int d=a&COS_LOOKUP_I_MASK;
a=((COS_LOOKUP_I[i]<<COS_LOOKUP_I_SHIFT)-
d*(COS_LOOKUP_I[i]-COS_LOOKUP_I[i+1]))>>
(COS_LOOKUP_I_SHIFT-LSP_FRACBITS+14);
}
return(a);
}
static int barklook[28]={
0,100,200,301, 405,516,635,766,
912,1077,1263,1476, 1720,2003,2333,2721,
3184,3742,4428,5285, 6376,7791,9662,12181,
15624,20397,27087,36554
};
/* used in init only; interpolate the long way */
static inline ogg_int32_t toBARK(int n){
int i;
for(i=0;i<27;i++)
if(n>=barklook[i] && n<barklook[i+1])break;
if(i==27){
return 27<<15;
}else{
int gap=barklook[i+1]-barklook[i];
int del=n-barklook[i];
return((i<<15)+((del<<15)/gap));
}
}
static int MLOOP_1[64]={
0,10,11,11, 12,12,12,12, 13,13,13,13, 13,13,13,13,
14,14,14,14, 14,14,14,14, 14,14,14,14, 14,14,14,14,
15,15,15,15, 15,15,15,15, 15,15,15,15, 15,15,15,15,
15,15,15,15, 15,15,15,15, 15,15,15,15, 15,15,15,15,
};
static int MLOOP_2[64]={
0,4,5,5, 6,6,6,6, 7,7,7,7, 7,7,7,7,
8,8,8,8, 8,8,8,8, 8,8,8,8, 8,8,8,8,
9,9,9,9, 9,9,9,9, 9,9,9,9, 9,9,9,9,
9,9,9,9, 9,9,9,9, 9,9,9,9, 9,9,9,9,
};
static int MLOOP_3[8]={0,1,2,2,3,3,3,3};
void vorbis_lsp_to_curve(ogg_int32_t *curve,int *map,int n,int ln,
ogg_int32_t *lsp,int m,
ogg_int32_t amp,
ogg_int32_t ampoffset,
ogg_int32_t *icos){
/* 0 <= m < 256 */
/* set up for using all int later */
int i;
int ampoffseti=ampoffset*4096;
int ampi=amp;
ogg_int32_t *ilsp=(ogg_int32_t *)alloca(m*sizeof(*ilsp));
ogg_int32_t invsq=0x517cc2;
/* lsp is in 8.24, range 0 to PI; coslook wants it in .16 0 to 1*/
for(i=0;i<m;i++){
ogg_int32_t val=MULT32(lsp[i],invsq);
/* safeguard against a malicious stream */
if(val<0 || (val>>COS_LOOKUP_I_SHIFT)>=COS_LOOKUP_I_SZ){
memset(curve,0,sizeof(*curve)*n);
return;
}
ilsp[i]=vorbis_coslook_i(val);
}
i=0;
while(i<n){
int j,k=map[i];
ogg_uint32_t pi=46341; /* 2**-.5 in 0.16 */
ogg_uint32_t qi=46341;
ogg_int32_t qexp=0,shift;
ogg_int32_t wi=icos[k];
#ifdef _V_LSP_MATH_ASM
lsp_loop_asm(&qi,&pi,&qexp,ilsp,wi,m);
pi=((pi*pi)>>16);
qi=((qi*qi)>>16);
if(m&1){
qexp= qexp*2-28*((m+1)>>1)+m;
pi*=(1<<14)-((wi*wi)>>14);
qi+=pi>>14;
}else{
qexp= qexp*2-13*m;
pi*=(1<<14)-wi;
qi*=(1<<14)+wi;
qi=(qi+pi)>>14;
}
if(qi&0xffff0000){ /* checks for 1.xxxxxxxxxxxxxxxx */
qi>>=1; qexp++;
}else
lsp_norm_asm(&qi,&qexp);
#else
qi*=labs(ilsp[0]-wi);
pi*=labs(ilsp[1]-wi);
for(j=3;j<m;j+=2){
if(!(shift=MLOOP_1[(pi|qi)>>25]))
if(!(shift=MLOOP_2[(pi|qi)>>19]))
shift=MLOOP_3[(pi|qi)>>16];
qi=(qi>>shift)*labs(ilsp[j-1]-wi);
pi=(pi>>shift)*labs(ilsp[j]-wi);
qexp+=shift;
}
if(!(shift=MLOOP_1[(pi|qi)>>25]))
if(!(shift=MLOOP_2[(pi|qi)>>19]))
shift=MLOOP_3[(pi|qi)>>16];
/* pi,qi normalized collectively, both tracked using qexp */
if(m&1){
/* odd order filter; slightly assymetric */
/* the last coefficient */
qi=(qi>>shift)*labs(ilsp[j-1]-wi);
pi=(pi>>shift)<<14;
qexp+=shift;
if(!(shift=MLOOP_1[(pi|qi)>>25]))
if(!(shift=MLOOP_2[(pi|qi)>>19]))
shift=MLOOP_3[(pi|qi)>>16];
pi>>=shift;
qi>>=shift;
qexp+=shift-14*((m+1)>>1);
pi=((pi*pi)>>16);
qi=((qi*qi)>>16);
qexp=qexp*2+m;
pi*=(1<<14)-((wi*wi)>>14);
qi+=pi>>14;
}else{
/* even order filter; still symmetric */
/* p*=p(1-w), q*=q(1+w), let normalization drift because it isn't
worth tracking step by step */
pi>>=shift;
qi>>=shift;
qexp+=shift-7*m;
pi=((pi*pi)>>16);
qi=((qi*qi)>>16);
qexp=qexp*2+m;
pi*=(1<<14)-wi;
qi*=(1<<14)+wi;
qi=(qi+pi)>>14;
}
/* we've let the normalization drift because it wasn't important;
however, for the lookup, things must be normalized again. We
need at most one right shift or a number of left shifts */
if(qi&0xffff0000){ /* checks for 1.xxxxxxxxxxxxxxxx */
qi>>=1; qexp++;
}else
while(qi && !(qi&0x8000)){ /* checks for 0.0xxxxxxxxxxxxxxx or less*/
qi<<=1; qexp--;
}
#endif
amp=vorbis_fromdBlook_i(ampi* /* n.4 */
vorbis_invsqlook_i(qi,qexp)-
/* m.8, m+n<=8 */
ampoffseti); /* 8.12[0] */
curve[i]= MULT31_SHIFT15(curve[i],amp);
while(map[++i]==k) curve[i]= MULT31_SHIFT15(curve[i],amp);
}
}
/*************** vorbis decode glue ************/
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)_ogg_free(look->linearmap);
if(look->lsp_look)_ogg_free(look->lsp_look);
memset(look,0,sizeof(*look));
_ogg_free(look);
}
}
static vorbis_info_floor *floor0_unpack (vorbis_info *vi,oggpack_buffer *opb){
codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
int j;
vorbis_info_floor0 *info=(vorbis_info_floor0 *)_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;
}
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 vorbis_look_floor *floor0_look (vorbis_dsp_state *vd,vorbis_info_mode *mi,
vorbis_info_floor *i){
int j;
ogg_int32_t scale;
vorbis_info *vi=vd->vi;
codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
vorbis_look_floor0 *look=(vorbis_look_floor0 *)_ogg_calloc(1,sizeof(*look));
look->m=info->order;
look->n=ci->blocksizes[mi->blockflag]/2;
look->ln=info->barkmap;
look->vi=info;
/* 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=(int *)_ogg_malloc((look->n+1)*sizeof(*look->linearmap));
for(j=0;j<look->n;j++){
int val=(look->ln*
((toBARK(info->rate/2*j/look->n)<<11)/toBARK(info->rate/2)))>>11;
if(val>=look->ln)val=look->ln-1; /* guard against the approximation */
look->linearmap[j]=val;
}
look->linearmap[j]=-1;
look->lsp_look=(ogg_int32_t *)_ogg_malloc(look->ln*sizeof(*look->lsp_look));
for(j=0;j<look->ln;j++)
look->lsp_look[j]=vorbis_coslook2_i(0x10000*j/look->ln);
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;
int amp=((ampraw*info->ampdB)<<4)/maxval;
int booknum=oggpack_read(&vb->opb,_ilog(info->numbooks));
if(booknum!=-1 && booknum<info->numbooks){ /* be paranoid */
codec_setup_info *ci=(codec_setup_info *)vb->vd->vi->codec_setup;
codebook *b=ci->fullbooks+info->books[booknum];
ogg_int32_t last=0;
ogg_int32_t *lsp=(ogg_int32_t *)_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,-24)==-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 int floor0_inverse2(vorbis_block *vb,vorbis_look_floor *i,
void *memo,ogg_int32_t *out){
vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
vorbis_info_floor0 *info=look->vi;
if(memo){
ogg_int32_t *lsp=(ogg_int32_t *)memo;
ogg_int32_t amp=lsp[look->m];
/* take the coefficients back to a spectral envelope curve */
vorbis_lsp_to_curve(out,look->linearmap,look->n,look->ln,
lsp,look->m,amp,info->ampdB,look->lsp_look);
return(1);
}
memset(out,0,sizeof(*out)*look->n);
return(0);
}
/* export hooks */
vorbis_func_floor floor0_exportbundle={
&floor0_unpack,&floor0_look,&floor0_free_info,
&floor0_free_look,&floor0_inverse1,&floor0_inverse2
};