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virtualx-engine/thirdparty/libvorbis/smallft.c
Rémi Verschelde 995dcb610c ogg/vorbis/opus/speex: 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.
(cherry picked from commit d9a291f641)

speex module was only added while cherry-picking, as speex is removed
in the master branch but we don't want to break compatibility in 2.1.x.
Unbundling wasn't done as the module uses the internal speex_free,
so it would require some more work.
2016-10-30 14:51:31 +01:00

1255 lines
22 KiB
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/********************************************************************
* *
* 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 1994-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function: *unnormalized* fft transform
last mod: $Id: smallft.c 16227 2009-07-08 06:58:46Z xiphmont $
********************************************************************/
/* FFT implementation from OggSquish, minus cosine transforms,
* minus all but radix 2/4 case. In Vorbis we only need this
* cut-down version.
*
* To do more than just power-of-two sized vectors, see the full
* version I wrote for NetLib.
*
* Note that the packing is a little strange; rather than the FFT r/i
* packing following R_0, I_n, R_1, I_1, R_2, I_2 ... R_n-1, I_n-1,
* it follows R_0, R_1, I_1, R_2, I_2 ... R_n-1, I_n-1, I_n like the
* FORTRAN version
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "smallft.h"
#include "os.h"
#include "misc.h"
static void drfti1(int n, float *wa, int *ifac){
static int ntryh[4] = { 4,2,3,5 };
static float tpi = 6.28318530717958648f;
float arg,argh,argld,fi;
int ntry=0,i,j=-1;
int k1, l1, l2, ib;
int ld, ii, ip, is, nq, nr;
int ido, ipm, nfm1;
int nl=n;
int nf=0;
L101:
j++;
if (j < 4)
ntry=ntryh[j];
else
ntry+=2;
L104:
nq=nl/ntry;
nr=nl-ntry*nq;
if (nr!=0) goto L101;
nf++;
ifac[nf+1]=ntry;
nl=nq;
if(ntry!=2)goto L107;
if(nf==1)goto L107;
for (i=1;i<nf;i++){
ib=nf-i+1;
ifac[ib+1]=ifac[ib];
}
ifac[2] = 2;
L107:
if(nl!=1)goto L104;
ifac[0]=n;
ifac[1]=nf;
argh=tpi/n;
is=0;
nfm1=nf-1;
l1=1;
if(nfm1==0)return;
for (k1=0;k1<nfm1;k1++){
ip=ifac[k1+2];
ld=0;
l2=l1*ip;
ido=n/l2;
ipm=ip-1;
for (j=0;j<ipm;j++){
ld+=l1;
i=is;
argld=(float)ld*argh;
fi=0.f;
for (ii=2;ii<ido;ii+=2){
fi+=1.f;
arg=fi*argld;
wa[i++]=cos(arg);
wa[i++]=sin(arg);
}
is+=ido;
}
l1=l2;
}
}
static void fdrffti(int n, float *wsave, int *ifac){
if (n == 1) return;
drfti1(n, wsave+n, ifac);
}
static void dradf2(int ido,int l1,float *cc,float *ch,float *wa1){
int i,k;
float ti2,tr2;
int t0,t1,t2,t3,t4,t5,t6;
t1=0;
t0=(t2=l1*ido);
t3=ido<<1;
for(k=0;k<l1;k++){
ch[t1<<1]=cc[t1]+cc[t2];
ch[(t1<<1)+t3-1]=cc[t1]-cc[t2];
t1+=ido;
t2+=ido;
}
if(ido<2)return;
if(ido==2)goto L105;
t1=0;
t2=t0;
for(k=0;k<l1;k++){
t3=t2;
t4=(t1<<1)+(ido<<1);
t5=t1;
t6=t1+t1;
for(i=2;i<ido;i+=2){
t3+=2;
t4-=2;
t5+=2;
t6+=2;
tr2=wa1[i-2]*cc[t3-1]+wa1[i-1]*cc[t3];
ti2=wa1[i-2]*cc[t3]-wa1[i-1]*cc[t3-1];
ch[t6]=cc[t5]+ti2;
ch[t4]=ti2-cc[t5];
ch[t6-1]=cc[t5-1]+tr2;
ch[t4-1]=cc[t5-1]-tr2;
}
t1+=ido;
t2+=ido;
}
if(ido%2==1)return;
L105:
t3=(t2=(t1=ido)-1);
t2+=t0;
for(k=0;k<l1;k++){
ch[t1]=-cc[t2];
ch[t1-1]=cc[t3];
t1+=ido<<1;
t2+=ido;
t3+=ido;
}
}
static void dradf4(int ido,int l1,float *cc,float *ch,float *wa1,
float *wa2,float *wa3){
static float hsqt2 = .70710678118654752f;
int i,k,t0,t1,t2,t3,t4,t5,t6;
float ci2,ci3,ci4,cr2,cr3,cr4,ti1,ti2,ti3,ti4,tr1,tr2,tr3,tr4;
t0=l1*ido;
t1=t0;
t4=t1<<1;
t2=t1+(t1<<1);
t3=0;
for(k=0;k<l1;k++){
tr1=cc[t1]+cc[t2];
tr2=cc[t3]+cc[t4];
ch[t5=t3<<2]=tr1+tr2;
ch[(ido<<2)+t5-1]=tr2-tr1;
ch[(t5+=(ido<<1))-1]=cc[t3]-cc[t4];
ch[t5]=cc[t2]-cc[t1];
t1+=ido;
t2+=ido;
t3+=ido;
t4+=ido;
}
if(ido<2)return;
if(ido==2)goto L105;
t1=0;
for(k=0;k<l1;k++){
t2=t1;
t4=t1<<2;
t5=(t6=ido<<1)+t4;
for(i=2;i<ido;i+=2){
t3=(t2+=2);
t4+=2;
t5-=2;
t3+=t0;
cr2=wa1[i-2]*cc[t3-1]+wa1[i-1]*cc[t3];
ci2=wa1[i-2]*cc[t3]-wa1[i-1]*cc[t3-1];
t3+=t0;
cr3=wa2[i-2]*cc[t3-1]+wa2[i-1]*cc[t3];
ci3=wa2[i-2]*cc[t3]-wa2[i-1]*cc[t3-1];
t3+=t0;
cr4=wa3[i-2]*cc[t3-1]+wa3[i-1]*cc[t3];
ci4=wa3[i-2]*cc[t3]-wa3[i-1]*cc[t3-1];
tr1=cr2+cr4;
tr4=cr4-cr2;
ti1=ci2+ci4;
ti4=ci2-ci4;
ti2=cc[t2]+ci3;
ti3=cc[t2]-ci3;
tr2=cc[t2-1]+cr3;
tr3=cc[t2-1]-cr3;
ch[t4-1]=tr1+tr2;
ch[t4]=ti1+ti2;
ch[t5-1]=tr3-ti4;
ch[t5]=tr4-ti3;
ch[t4+t6-1]=ti4+tr3;
ch[t4+t6]=tr4+ti3;
ch[t5+t6-1]=tr2-tr1;
ch[t5+t6]=ti1-ti2;
}
t1+=ido;
}
if(ido&1)return;
L105:
t2=(t1=t0+ido-1)+(t0<<1);
t3=ido<<2;
t4=ido;
t5=ido<<1;
t6=ido;
for(k=0;k<l1;k++){
ti1=-hsqt2*(cc[t1]+cc[t2]);
tr1=hsqt2*(cc[t1]-cc[t2]);
ch[t4-1]=tr1+cc[t6-1];
ch[t4+t5-1]=cc[t6-1]-tr1;
ch[t4]=ti1-cc[t1+t0];
ch[t4+t5]=ti1+cc[t1+t0];
t1+=ido;
t2+=ido;
t4+=t3;
t6+=ido;
}
}
static void dradfg(int ido,int ip,int l1,int idl1,float *cc,float *c1,
float *c2,float *ch,float *ch2,float *wa){
static float tpi=6.283185307179586f;
int idij,ipph,i,j,k,l,ic,ik,is;
int t0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10;
float dc2,ai1,ai2,ar1,ar2,ds2;
int nbd;
float dcp,arg,dsp,ar1h,ar2h;
int idp2,ipp2;
arg=tpi/(float)ip;
dcp=cos(arg);
dsp=sin(arg);
ipph=(ip+1)>>1;
ipp2=ip;
idp2=ido;
nbd=(ido-1)>>1;
t0=l1*ido;
t10=ip*ido;
if(ido==1)goto L119;
for(ik=0;ik<idl1;ik++)ch2[ik]=c2[ik];
t1=0;
for(j=1;j<ip;j++){
t1+=t0;
t2=t1;
for(k=0;k<l1;k++){
ch[t2]=c1[t2];
t2+=ido;
}
}
is=-ido;
t1=0;
if(nbd>l1){
for(j=1;j<ip;j++){
t1+=t0;
is+=ido;
t2= -ido+t1;
for(k=0;k<l1;k++){
idij=is-1;
t2+=ido;
t3=t2;
for(i=2;i<ido;i+=2){
idij+=2;
t3+=2;
ch[t3-1]=wa[idij-1]*c1[t3-1]+wa[idij]*c1[t3];
ch[t3]=wa[idij-1]*c1[t3]-wa[idij]*c1[t3-1];
}
}
}
}else{
for(j=1;j<ip;j++){
is+=ido;
idij=is-1;
t1+=t0;
t2=t1;
for(i=2;i<ido;i+=2){
idij+=2;
t2+=2;
t3=t2;
for(k=0;k<l1;k++){
ch[t3-1]=wa[idij-1]*c1[t3-1]+wa[idij]*c1[t3];
ch[t3]=wa[idij-1]*c1[t3]-wa[idij]*c1[t3-1];
t3+=ido;
}
}
}
}
t1=0;
t2=ipp2*t0;
if(nbd<l1){
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1;
t4=t2;
for(i=2;i<ido;i+=2){
t3+=2;
t4+=2;
t5=t3-ido;
t6=t4-ido;
for(k=0;k<l1;k++){
t5+=ido;
t6+=ido;
c1[t5-1]=ch[t5-1]+ch[t6-1];
c1[t6-1]=ch[t5]-ch[t6];
c1[t5]=ch[t5]+ch[t6];
c1[t6]=ch[t6-1]-ch[t5-1];
}
}
}
}else{
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1;
t4=t2;
for(k=0;k<l1;k++){
t5=t3;
t6=t4;
for(i=2;i<ido;i+=2){
t5+=2;
t6+=2;
c1[t5-1]=ch[t5-1]+ch[t6-1];
c1[t6-1]=ch[t5]-ch[t6];
c1[t5]=ch[t5]+ch[t6];
c1[t6]=ch[t6-1]-ch[t5-1];
}
t3+=ido;
t4+=ido;
}
}
}
L119:
for(ik=0;ik<idl1;ik++)c2[ik]=ch2[ik];
t1=0;
t2=ipp2*idl1;
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1-ido;
t4=t2-ido;
for(k=0;k<l1;k++){
t3+=ido;
t4+=ido;
c1[t3]=ch[t3]+ch[t4];
c1[t4]=ch[t4]-ch[t3];
}
}
ar1=1.f;
ai1=0.f;
t1=0;
t2=ipp2*idl1;
t3=(ip-1)*idl1;
for(l=1;l<ipph;l++){
t1+=idl1;
t2-=idl1;
ar1h=dcp*ar1-dsp*ai1;
ai1=dcp*ai1+dsp*ar1;
ar1=ar1h;
t4=t1;
t5=t2;
t6=t3;
t7=idl1;
for(ik=0;ik<idl1;ik++){
ch2[t4++]=c2[ik]+ar1*c2[t7++];
ch2[t5++]=ai1*c2[t6++];
}
dc2=ar1;
ds2=ai1;
ar2=ar1;
ai2=ai1;
t4=idl1;
t5=(ipp2-1)*idl1;
for(j=2;j<ipph;j++){
t4+=idl1;
t5-=idl1;
ar2h=dc2*ar2-ds2*ai2;
ai2=dc2*ai2+ds2*ar2;
ar2=ar2h;
t6=t1;
t7=t2;
t8=t4;
t9=t5;
for(ik=0;ik<idl1;ik++){
ch2[t6++]+=ar2*c2[t8++];
ch2[t7++]+=ai2*c2[t9++];
}
}
}
t1=0;
for(j=1;j<ipph;j++){
t1+=idl1;
t2=t1;
for(ik=0;ik<idl1;ik++)ch2[ik]+=c2[t2++];
}
if(ido<l1)goto L132;
t1=0;
t2=0;
for(k=0;k<l1;k++){
t3=t1;
t4=t2;
for(i=0;i<ido;i++)cc[t4++]=ch[t3++];
t1+=ido;
t2+=t10;
}
goto L135;
L132:
for(i=0;i<ido;i++){
t1=i;
t2=i;
for(k=0;k<l1;k++){
cc[t2]=ch[t1];
t1+=ido;
t2+=t10;
}
}
L135:
t1=0;
t2=ido<<1;
t3=0;
t4=ipp2*t0;
for(j=1;j<ipph;j++){
t1+=t2;
t3+=t0;
t4-=t0;
t5=t1;
t6=t3;
t7=t4;
for(k=0;k<l1;k++){
cc[t5-1]=ch[t6];
cc[t5]=ch[t7];
t5+=t10;
t6+=ido;
t7+=ido;
}
}
if(ido==1)return;
if(nbd<l1)goto L141;
t1=-ido;
t3=0;
t4=0;
t5=ipp2*t0;
for(j=1;j<ipph;j++){
t1+=t2;
t3+=t2;
t4+=t0;
t5-=t0;
t6=t1;
t7=t3;
t8=t4;
t9=t5;
for(k=0;k<l1;k++){
for(i=2;i<ido;i+=2){
ic=idp2-i;
cc[i+t7-1]=ch[i+t8-1]+ch[i+t9-1];
cc[ic+t6-1]=ch[i+t8-1]-ch[i+t9-1];
cc[i+t7]=ch[i+t8]+ch[i+t9];
cc[ic+t6]=ch[i+t9]-ch[i+t8];
}
t6+=t10;
t7+=t10;
t8+=ido;
t9+=ido;
}
}
return;
L141:
t1=-ido;
t3=0;
t4=0;
t5=ipp2*t0;
for(j=1;j<ipph;j++){
t1+=t2;
t3+=t2;
t4+=t0;
t5-=t0;
for(i=2;i<ido;i+=2){
t6=idp2+t1-i;
t7=i+t3;
t8=i+t4;
t9=i+t5;
for(k=0;k<l1;k++){
cc[t7-1]=ch[t8-1]+ch[t9-1];
cc[t6-1]=ch[t8-1]-ch[t9-1];
cc[t7]=ch[t8]+ch[t9];
cc[t6]=ch[t9]-ch[t8];
t6+=t10;
t7+=t10;
t8+=ido;
t9+=ido;
}
}
}
}
static void drftf1(int n,float *c,float *ch,float *wa,int *ifac){
int i,k1,l1,l2;
int na,kh,nf;
int ip,iw,ido,idl1,ix2,ix3;
nf=ifac[1];
na=1;
l2=n;
iw=n;
for(k1=0;k1<nf;k1++){
kh=nf-k1;
ip=ifac[kh+1];
l1=l2/ip;
ido=n/l2;
idl1=ido*l1;
iw-=(ip-1)*ido;
na=1-na;
if(ip!=4)goto L102;
ix2=iw+ido;
ix3=ix2+ido;
if(na!=0)
dradf4(ido,l1,ch,c,wa+iw-1,wa+ix2-1,wa+ix3-1);
else
dradf4(ido,l1,c,ch,wa+iw-1,wa+ix2-1,wa+ix3-1);
goto L110;
L102:
if(ip!=2)goto L104;
if(na!=0)goto L103;
dradf2(ido,l1,c,ch,wa+iw-1);
goto L110;
L103:
dradf2(ido,l1,ch,c,wa+iw-1);
goto L110;
L104:
if(ido==1)na=1-na;
if(na!=0)goto L109;
dradfg(ido,ip,l1,idl1,c,c,c,ch,ch,wa+iw-1);
na=1;
goto L110;
L109:
dradfg(ido,ip,l1,idl1,ch,ch,ch,c,c,wa+iw-1);
na=0;
L110:
l2=l1;
}
if(na==1)return;
for(i=0;i<n;i++)c[i]=ch[i];
}
static void dradb2(int ido,int l1,float *cc,float *ch,float *wa1){
int i,k,t0,t1,t2,t3,t4,t5,t6;
float ti2,tr2;
t0=l1*ido;
t1=0;
t2=0;
t3=(ido<<1)-1;
for(k=0;k<l1;k++){
ch[t1]=cc[t2]+cc[t3+t2];
ch[t1+t0]=cc[t2]-cc[t3+t2];
t2=(t1+=ido)<<1;
}
if(ido<2)return;
if(ido==2)goto L105;
t1=0;
t2=0;
for(k=0;k<l1;k++){
t3=t1;
t5=(t4=t2)+(ido<<1);
t6=t0+t1;
for(i=2;i<ido;i+=2){
t3+=2;
t4+=2;
t5-=2;
t6+=2;
ch[t3-1]=cc[t4-1]+cc[t5-1];
tr2=cc[t4-1]-cc[t5-1];
ch[t3]=cc[t4]-cc[t5];
ti2=cc[t4]+cc[t5];
ch[t6-1]=wa1[i-2]*tr2-wa1[i-1]*ti2;
ch[t6]=wa1[i-2]*ti2+wa1[i-1]*tr2;
}
t2=(t1+=ido)<<1;
}
if(ido%2==1)return;
L105:
t1=ido-1;
t2=ido-1;
for(k=0;k<l1;k++){
ch[t1]=cc[t2]+cc[t2];
ch[t1+t0]=-(cc[t2+1]+cc[t2+1]);
t1+=ido;
t2+=ido<<1;
}
}
static void dradb3(int ido,int l1,float *cc,float *ch,float *wa1,
float *wa2){
static float taur = -.5f;
static float taui = .8660254037844386f;
int i,k,t0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10;
float ci2,ci3,di2,di3,cr2,cr3,dr2,dr3,ti2,tr2;
t0=l1*ido;
t1=0;
t2=t0<<1;
t3=ido<<1;
t4=ido+(ido<<1);
t5=0;
for(k=0;k<l1;k++){
tr2=cc[t3-1]+cc[t3-1];
cr2=cc[t5]+(taur*tr2);
ch[t1]=cc[t5]+tr2;
ci3=taui*(cc[t3]+cc[t3]);
ch[t1+t0]=cr2-ci3;
ch[t1+t2]=cr2+ci3;
t1+=ido;
t3+=t4;
t5+=t4;
}
if(ido==1)return;
t1=0;
t3=ido<<1;
for(k=0;k<l1;k++){
t7=t1+(t1<<1);
t6=(t5=t7+t3);
t8=t1;
t10=(t9=t1+t0)+t0;
for(i=2;i<ido;i+=2){
t5+=2;
t6-=2;
t7+=2;
t8+=2;
t9+=2;
t10+=2;
tr2=cc[t5-1]+cc[t6-1];
cr2=cc[t7-1]+(taur*tr2);
ch[t8-1]=cc[t7-1]+tr2;
ti2=cc[t5]-cc[t6];
ci2=cc[t7]+(taur*ti2);
ch[t8]=cc[t7]+ti2;
cr3=taui*(cc[t5-1]-cc[t6-1]);
ci3=taui*(cc[t5]+cc[t6]);
dr2=cr2-ci3;
dr3=cr2+ci3;
di2=ci2+cr3;
di3=ci2-cr3;
ch[t9-1]=wa1[i-2]*dr2-wa1[i-1]*di2;
ch[t9]=wa1[i-2]*di2+wa1[i-1]*dr2;
ch[t10-1]=wa2[i-2]*dr3-wa2[i-1]*di3;
ch[t10]=wa2[i-2]*di3+wa2[i-1]*dr3;
}
t1+=ido;
}
}
static void dradb4(int ido,int l1,float *cc,float *ch,float *wa1,
float *wa2,float *wa3){
static float sqrt2=1.414213562373095f;
int i,k,t0,t1,t2,t3,t4,t5,t6,t7,t8;
float ci2,ci3,ci4,cr2,cr3,cr4,ti1,ti2,ti3,ti4,tr1,tr2,tr3,tr4;
t0=l1*ido;
t1=0;
t2=ido<<2;
t3=0;
t6=ido<<1;
for(k=0;k<l1;k++){
t4=t3+t6;
t5=t1;
tr3=cc[t4-1]+cc[t4-1];
tr4=cc[t4]+cc[t4];
tr1=cc[t3]-cc[(t4+=t6)-1];
tr2=cc[t3]+cc[t4-1];
ch[t5]=tr2+tr3;
ch[t5+=t0]=tr1-tr4;
ch[t5+=t0]=tr2-tr3;
ch[t5+=t0]=tr1+tr4;
t1+=ido;
t3+=t2;
}
if(ido<2)return;
if(ido==2)goto L105;
t1=0;
for(k=0;k<l1;k++){
t5=(t4=(t3=(t2=t1<<2)+t6))+t6;
t7=t1;
for(i=2;i<ido;i+=2){
t2+=2;
t3+=2;
t4-=2;
t5-=2;
t7+=2;
ti1=cc[t2]+cc[t5];
ti2=cc[t2]-cc[t5];
ti3=cc[t3]-cc[t4];
tr4=cc[t3]+cc[t4];
tr1=cc[t2-1]-cc[t5-1];
tr2=cc[t2-1]+cc[t5-1];
ti4=cc[t3-1]-cc[t4-1];
tr3=cc[t3-1]+cc[t4-1];
ch[t7-1]=tr2+tr3;
cr3=tr2-tr3;
ch[t7]=ti2+ti3;
ci3=ti2-ti3;
cr2=tr1-tr4;
cr4=tr1+tr4;
ci2=ti1+ti4;
ci4=ti1-ti4;
ch[(t8=t7+t0)-1]=wa1[i-2]*cr2-wa1[i-1]*ci2;
ch[t8]=wa1[i-2]*ci2+wa1[i-1]*cr2;
ch[(t8+=t0)-1]=wa2[i-2]*cr3-wa2[i-1]*ci3;
ch[t8]=wa2[i-2]*ci3+wa2[i-1]*cr3;
ch[(t8+=t0)-1]=wa3[i-2]*cr4-wa3[i-1]*ci4;
ch[t8]=wa3[i-2]*ci4+wa3[i-1]*cr4;
}
t1+=ido;
}
if(ido%2 == 1)return;
L105:
t1=ido;
t2=ido<<2;
t3=ido-1;
t4=ido+(ido<<1);
for(k=0;k<l1;k++){
t5=t3;
ti1=cc[t1]+cc[t4];
ti2=cc[t4]-cc[t1];
tr1=cc[t1-1]-cc[t4-1];
tr2=cc[t1-1]+cc[t4-1];
ch[t5]=tr2+tr2;
ch[t5+=t0]=sqrt2*(tr1-ti1);
ch[t5+=t0]=ti2+ti2;
ch[t5+=t0]=-sqrt2*(tr1+ti1);
t3+=ido;
t1+=t2;
t4+=t2;
}
}
static void dradbg(int ido,int ip,int l1,int idl1,float *cc,float *c1,
float *c2,float *ch,float *ch2,float *wa){
static float tpi=6.283185307179586f;
int idij,ipph,i,j,k,l,ik,is,t0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,
t11,t12;
float dc2,ai1,ai2,ar1,ar2,ds2;
int nbd;
float dcp,arg,dsp,ar1h,ar2h;
int ipp2;
t10=ip*ido;
t0=l1*ido;
arg=tpi/(float)ip;
dcp=cos(arg);
dsp=sin(arg);
nbd=(ido-1)>>1;
ipp2=ip;
ipph=(ip+1)>>1;
if(ido<l1)goto L103;
t1=0;
t2=0;
for(k=0;k<l1;k++){
t3=t1;
t4=t2;
for(i=0;i<ido;i++){
ch[t3]=cc[t4];
t3++;
t4++;
}
t1+=ido;
t2+=t10;
}
goto L106;
L103:
t1=0;
for(i=0;i<ido;i++){
t2=t1;
t3=t1;
for(k=0;k<l1;k++){
ch[t2]=cc[t3];
t2+=ido;
t3+=t10;
}
t1++;
}
L106:
t1=0;
t2=ipp2*t0;
t7=(t5=ido<<1);
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1;
t4=t2;
t6=t5;
for(k=0;k<l1;k++){
ch[t3]=cc[t6-1]+cc[t6-1];
ch[t4]=cc[t6]+cc[t6];
t3+=ido;
t4+=ido;
t6+=t10;
}
t5+=t7;
}
if (ido == 1)goto L116;
if(nbd<l1)goto L112;
t1=0;
t2=ipp2*t0;
t7=0;
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1;
t4=t2;
t7+=(ido<<1);
t8=t7;
for(k=0;k<l1;k++){
t5=t3;
t6=t4;
t9=t8;
t11=t8;
for(i=2;i<ido;i+=2){
t5+=2;
t6+=2;
t9+=2;
t11-=2;
ch[t5-1]=cc[t9-1]+cc[t11-1];
ch[t6-1]=cc[t9-1]-cc[t11-1];
ch[t5]=cc[t9]-cc[t11];
ch[t6]=cc[t9]+cc[t11];
}
t3+=ido;
t4+=ido;
t8+=t10;
}
}
goto L116;
L112:
t1=0;
t2=ipp2*t0;
t7=0;
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1;
t4=t2;
t7+=(ido<<1);
t8=t7;
t9=t7;
for(i=2;i<ido;i+=2){
t3+=2;
t4+=2;
t8+=2;
t9-=2;
t5=t3;
t6=t4;
t11=t8;
t12=t9;
for(k=0;k<l1;k++){
ch[t5-1]=cc[t11-1]+cc[t12-1];
ch[t6-1]=cc[t11-1]-cc[t12-1];
ch[t5]=cc[t11]-cc[t12];
ch[t6]=cc[t11]+cc[t12];
t5+=ido;
t6+=ido;
t11+=t10;
t12+=t10;
}
}
}
L116:
ar1=1.f;
ai1=0.f;
t1=0;
t9=(t2=ipp2*idl1);
t3=(ip-1)*idl1;
for(l=1;l<ipph;l++){
t1+=idl1;
t2-=idl1;
ar1h=dcp*ar1-dsp*ai1;
ai1=dcp*ai1+dsp*ar1;
ar1=ar1h;
t4=t1;
t5=t2;
t6=0;
t7=idl1;
t8=t3;
for(ik=0;ik<idl1;ik++){
c2[t4++]=ch2[t6++]+ar1*ch2[t7++];
c2[t5++]=ai1*ch2[t8++];
}
dc2=ar1;
ds2=ai1;
ar2=ar1;
ai2=ai1;
t6=idl1;
t7=t9-idl1;
for(j=2;j<ipph;j++){
t6+=idl1;
t7-=idl1;
ar2h=dc2*ar2-ds2*ai2;
ai2=dc2*ai2+ds2*ar2;
ar2=ar2h;
t4=t1;
t5=t2;
t11=t6;
t12=t7;
for(ik=0;ik<idl1;ik++){
c2[t4++]+=ar2*ch2[t11++];
c2[t5++]+=ai2*ch2[t12++];
}
}
}
t1=0;
for(j=1;j<ipph;j++){
t1+=idl1;
t2=t1;
for(ik=0;ik<idl1;ik++)ch2[ik]+=ch2[t2++];
}
t1=0;
t2=ipp2*t0;
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1;
t4=t2;
for(k=0;k<l1;k++){
ch[t3]=c1[t3]-c1[t4];
ch[t4]=c1[t3]+c1[t4];
t3+=ido;
t4+=ido;
}
}
if(ido==1)goto L132;
if(nbd<l1)goto L128;
t1=0;
t2=ipp2*t0;
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1;
t4=t2;
for(k=0;k<l1;k++){
t5=t3;
t6=t4;
for(i=2;i<ido;i+=2){
t5+=2;
t6+=2;
ch[t5-1]=c1[t5-1]-c1[t6];
ch[t6-1]=c1[t5-1]+c1[t6];
ch[t5]=c1[t5]+c1[t6-1];
ch[t6]=c1[t5]-c1[t6-1];
}
t3+=ido;
t4+=ido;
}
}
goto L132;
L128:
t1=0;
t2=ipp2*t0;
for(j=1;j<ipph;j++){
t1+=t0;
t2-=t0;
t3=t1;
t4=t2;
for(i=2;i<ido;i+=2){
t3+=2;
t4+=2;
t5=t3;
t6=t4;
for(k=0;k<l1;k++){
ch[t5-1]=c1[t5-1]-c1[t6];
ch[t6-1]=c1[t5-1]+c1[t6];
ch[t5]=c1[t5]+c1[t6-1];
ch[t6]=c1[t5]-c1[t6-1];
t5+=ido;
t6+=ido;
}
}
}
L132:
if(ido==1)return;
for(ik=0;ik<idl1;ik++)c2[ik]=ch2[ik];
t1=0;
for(j=1;j<ip;j++){
t2=(t1+=t0);
for(k=0;k<l1;k++){
c1[t2]=ch[t2];
t2+=ido;
}
}
if(nbd>l1)goto L139;
is= -ido-1;
t1=0;
for(j=1;j<ip;j++){
is+=ido;
t1+=t0;
idij=is;
t2=t1;
for(i=2;i<ido;i+=2){
t2+=2;
idij+=2;
t3=t2;
for(k=0;k<l1;k++){
c1[t3-1]=wa[idij-1]*ch[t3-1]-wa[idij]*ch[t3];
c1[t3]=wa[idij-1]*ch[t3]+wa[idij]*ch[t3-1];
t3+=ido;
}
}
}
return;
L139:
is= -ido-1;
t1=0;
for(j=1;j<ip;j++){
is+=ido;
t1+=t0;
t2=t1;
for(k=0;k<l1;k++){
idij=is;
t3=t2;
for(i=2;i<ido;i+=2){
idij+=2;
t3+=2;
c1[t3-1]=wa[idij-1]*ch[t3-1]-wa[idij]*ch[t3];
c1[t3]=wa[idij-1]*ch[t3]+wa[idij]*ch[t3-1];
}
t2+=ido;
}
}
}
static void drftb1(int n, float *c, float *ch, float *wa, int *ifac){
int i,k1,l1,l2;
int na;
int nf,ip,iw,ix2,ix3,ido,idl1;
nf=ifac[1];
na=0;
l1=1;
iw=1;
for(k1=0;k1<nf;k1++){
ip=ifac[k1 + 2];
l2=ip*l1;
ido=n/l2;
idl1=ido*l1;
if(ip!=4)goto L103;
ix2=iw+ido;
ix3=ix2+ido;
if(na!=0)
dradb4(ido,l1,ch,c,wa+iw-1,wa+ix2-1,wa+ix3-1);
else
dradb4(ido,l1,c,ch,wa+iw-1,wa+ix2-1,wa+ix3-1);
na=1-na;
goto L115;
L103:
if(ip!=2)goto L106;
if(na!=0)
dradb2(ido,l1,ch,c,wa+iw-1);
else
dradb2(ido,l1,c,ch,wa+iw-1);
na=1-na;
goto L115;
L106:
if(ip!=3)goto L109;
ix2=iw+ido;
if(na!=0)
dradb3(ido,l1,ch,c,wa+iw-1,wa+ix2-1);
else
dradb3(ido,l1,c,ch,wa+iw-1,wa+ix2-1);
na=1-na;
goto L115;
L109:
/* The radix five case can be translated later..... */
/* if(ip!=5)goto L112;
ix2=iw+ido;
ix3=ix2+ido;
ix4=ix3+ido;
if(na!=0)
dradb5(ido,l1,ch,c,wa+iw-1,wa+ix2-1,wa+ix3-1,wa+ix4-1);
else
dradb5(ido,l1,c,ch,wa+iw-1,wa+ix2-1,wa+ix3-1,wa+ix4-1);
na=1-na;
goto L115;
L112:*/
if(na!=0)
dradbg(ido,ip,l1,idl1,ch,ch,ch,c,c,wa+iw-1);
else
dradbg(ido,ip,l1,idl1,c,c,c,ch,ch,wa+iw-1);
if(ido==1)na=1-na;
L115:
l1=l2;
iw+=(ip-1)*ido;
}
if(na==0)return;
for(i=0;i<n;i++)c[i]=ch[i];
}
void drft_forward(drft_lookup *l,float *data){
if(l->n==1)return;
drftf1(l->n,data,l->trigcache,l->trigcache+l->n,l->splitcache);
}
void drft_backward(drft_lookup *l,float *data){
if (l->n==1)return;
drftb1(l->n,data,l->trigcache,l->trigcache+l->n,l->splitcache);
}
void drft_init(drft_lookup *l,int n){
l->n=n;
l->trigcache=_ogg_calloc(3*n,sizeof(*l->trigcache));
l->splitcache=_ogg_calloc(32,sizeof(*l->splitcache));
fdrffti(n, l->trigcache, l->splitcache);
}
void drft_clear(drft_lookup *l){
if(l){
if(l->trigcache)_ogg_free(l->trigcache);
if(l->splitcache)_ogg_free(l->splitcache);
memset(l,0,sizeof(*l));
}
}
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