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fft2.c
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// Copyright (c) <2012> <Leif Asbrink>
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify,
// merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.
#include "globdef.h"
#include "uidef.h"
#include "seldef.h"
#include "fft2def.h"
#include "fft1def.h"
#include "screendef.h"
#include "sigdef.h"
#include "thrdef.h"
void update_wg_waterf(void);
void make_fft2(void)
{
int y;
float yval;
int ja, jb, jc, jd;
int i, ix, mm, m;
float t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12;
float r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12;
float a1,a2,a3,a4;
float b1,b2,b3,b4;
float c1,c2,c3,c4;
float d1,d2,d3,d4;
float der;
int ia, ib, ic, id, itab;
int inc,j,k,n,n1,n2;
int m2, siz,siz_d4,siz_m4,siz_m2,siz_d2;
float u0,u1,u2,u3,u4,u5,u6,u7;
float w0,w1,w2,w3,w4,w5,w6,w7;
float x0,x1,x2,x3,x4,x5,x6,x7;
float y8,y9,y2,y3,y4,y5,y6,y7;
float ss1,ss2,cs1,cs2;
float *z,*fftxy, *fftab, *pwra;
TWOCHAN_POWER *ya;
int p0, mask;
// The second fft may be very large. To produce optimum sensitivity
// bandwidths below 1Hz may be desireable.
// Every time this routine is called it will do just a fraction of
// the complete transform as indicated by make_fft2_status.
siz=fft2_size;
fftxy=&fft2_float[fft2_pa];
z=(float*)(fftxy);
if(sw_onechan) {
switch (make_fft2_status) {
case FFT2_NOT_ACTIVE:
mask=timf2_mask;
if(FFT2_CURMODE == 15) {
mask=timf2_mask;
p0=timf2_px;
if(genparm[SECOND_FFT_SINPOW] != 0) {
for(i=0; i<siz; i++) {
z[2*i ]=fft2_window[i]*(timf2_float[p0 ]+timf2_float[p0+2]);
z[2*i+1]=fft2_window[i]*(timf2_float[p0+1]+timf2_float[p0+3]);
p0=(p0+4)&mask;
}
} else {
for(i=0; i<siz; i++) {
z[2*i ]=(timf2_float[p0 ]+timf2_float[p0+2]);
z[2*i+1]=(timf2_float[p0+1]+timf2_float[p0+3]);
p0=(p0+4)&mask;
}
}
big_fftforward(siz, fft2_n, z,
fft2_tab, fft2_bigpermute, yieldflag_fft2_fft2);
make_fft2_status=FFT2_ELIMINATE_SPURS;
return;
}
fft2_chunk_counter=2;
fft2_inc=siz/16;
fft2_m1=32;
fft2_m2=8;
if(FFT2_CURMODE == 6) {
make_fft2_status=FFT2_B;
} else {
// Use MMX routines
lirerr(995346);
make_fft2_status=FFT2_MMXB;
return;
}
p0=timf2_px;
if(genparm[SECOND_FFT_SINPOW] == 0) {
for(j=0; j<siz; j+=4) {
ia=(p0+4*fft2_bigpermute[j ])&mask;
ib=(p0+4*fft2_bigpermute[j+1])&mask;
ic=(p0+4*fft2_bigpermute[j+2])&mask;
id=(p0+4*fft2_bigpermute[j+3])&mask;
t1= timf2_float[ia ]+timf2_float[ib ]+
timf2_float[ia+2]+timf2_float[ib+2];
t2=-(timf2_float[ia+1]+timf2_float[ib+1]+
timf2_float[ia+3]+timf2_float[ib+3]);
t3= timf2_float[ic ]+timf2_float[id ]+
timf2_float[ic+2]+timf2_float[id+2];
t4=-(timf2_float[ic+1]+timf2_float[id+1]+
timf2_float[ic+3]+timf2_float[id+3]);
t5= timf2_float[ia ]-timf2_float[ib ]+
timf2_float[ia+2]-timf2_float[ib+2];
t7=-(timf2_float[ia+1]-timf2_float[ib+1]+
timf2_float[ia+3]-timf2_float[ib+3]);
t10= timf2_float[ic ]-timf2_float[id ]+
timf2_float[ic+2]-timf2_float[id+2];
t6= -(timf2_float[ic+1]-timf2_float[id+1]+
timf2_float[ic+3]-timf2_float[id+3]);
z[2*j ]=t1+t3;
z[2*j+1]=t2+t4;
z[2*j+4]=t1-t3;
z[2*j+5]=t2-t4;
t11=t5-t6;
t8=t7-t10;
t12=t5+t6;
t9=t7+t10;
z[2*j+2]=t12;
z[2*j+3]=t8;
z[2*j+6]=t11;
z[2*j+7]=t9;
}
} else {
for(j=0; j<siz; j+=4) {
ja=fft2_bigpermute[j ];
jb=fft2_bigpermute[j+1];
jc=fft2_bigpermute[j+2];
jd=fft2_bigpermute[j+3];
ia=(p0+4*ja)&mask;
ib=(p0+4*jb)&mask;
ic=(p0+4*jc)&mask;
id=(p0+4*jd)&mask;
a1=fft2_window[ja]*(timf2_float[ia ]+timf2_float[ia+2]);
a2=fft2_window[ja]*(timf2_float[ia+1]+timf2_float[ia+3]);
b1=fft2_window[jb]*(timf2_float[ib ]+timf2_float[ib+2]);
b2=fft2_window[jb]*(timf2_float[ib+1]+timf2_float[ib+3]);
c1=fft2_window[jc]*(timf2_float[ic ]+timf2_float[ic+2]);
c2=fft2_window[jc]*(timf2_float[ic+1]+timf2_float[ic+3]);
d1=fft2_window[jd]*(timf2_float[id ]+timf2_float[id+2]);
d2=fft2_window[jd]*(timf2_float[id+1]+timf2_float[id+3]);
t1=a1+b1;
t2=-(a2+b2);
t3=c1+d1;
t4=-(c2+d2);
t5=a1-b1;
t7=-(a2-b2);
t10=c1-d1;
t6=-( c2-d2);
z[2*j ]=t1+t3;
z[2*j+1]=t2+t4;
z[2*j+4]=t1-t3;
z[2*j+5]=t2-t4;
t11=t5-t6;
t8=t7-t10;
t12=t5+t6;
t9=t7+t10;
z[2*j+2]=t12;
z[2*j+3]=t8;
z[2*j+6]=t11;
z[2*j+7]=t9;
}
}
return;
case FFT2_MMXB:
case FFT2_MMXC:
lirerr(995346);
return;
case FFT2_B:
siz_d4=siz/4;
siz_m2=siz*2;
n1=fft2_chunk_counter;
n2=n1+fft2_chunk_n;
if(n2 >= fft2_n-2) {
n2=fft2_n-2;
make_fft2_status=FFT2_C;
}
fft2_chunk_counter=n2;
for(n=n1; n<n2; n+=2) {
inc=fft2_inc;
m2=fft2_m2;
for(j=0; j<siz_m2; j+=fft2_m1) {
itab=0;
ia=j;
lp1:
;
ib=ia+m2;
ss1= fft2_tab[2*itab].sin;
cs1= fft2_tab[2*itab].cos;
x0=z[ia ];
y8=z[ia+1];
x1=z[ib ];
y9=z[ib+1];
t1=cs1*x1+ss1*y9;
t2=cs1*y9-ss1*x1;
ic=ib+m2;
id=ic+m2;
x4=x0+t1;
y4=y8+t2;
x6=x0-t1;
y6=y8-t2;
x2=z[ic ];
y2=z[ic+1];
x3=z[id ];
y3=z[id+1];
t3=cs1*x3+ss1*y3;
t4=cs1*y3-ss1*x3;
x5=x2+t3;
y5=y2+t4;
x7=x2-t3;
y7=y2-t4;
ss2= fft2_tab[itab].sin;
cs2= fft2_tab[itab].cos;
t5=cs2*x5+ss2*y5;
t6=cs2*y5-ss2*x5;
z[ia ]=x4+t5;
z[ia+1]=y4+t6;
z[ic ]=x4-t5;
z[ic+1]=y4-t6;
t8=cs2*x7+ss2*y7;
t7=cs2*y7-ss2*x7;
z[ib ]=x6+t7;
z[ib+1]=y6-t8;
z[id ]=x6-t7;
z[id+1]=y6+t8;
itab+=inc;
ia+=2;
if(itab<siz_d4)goto lp1;
}
fft2_inc/=4;
fft2_m1*=4;
fft2_m2*=4;
}
return;
case FFT2_C:
if( (fft2_n&1)==1) {
siz_d2=siz/2;
ib=siz;
ia=0;
for(itab=0; itab<siz_d2; itab++) {
ss1= fft2_tab[itab].sin;
cs1= fft2_tab[itab].cos;
x0=z[ia ];
y8=z[ia+1];
x1=z[ib ];
y9=z[ib+1];
t1=cs1*x1+ss1*y9;
t2=cs1*y9-ss1*x1;
z[ib ]=x0-t1;
z[ib+1]=-(y8-t2);
z[ia ]=x0+t1;
z[ia+1]=-(y8+t2);
ia+=2;
ib+=2;
}
} else {
siz_d4=siz/4;
m2=siz/2;
itab=0;
ia=0;
lp3:
;
ib=ia+m2;
ss1= fft2_tab[2*itab].sin;
cs1= fft2_tab[2*itab].cos;
x0=z[ia ];
y8=z[ia+1];
x1=z[ib ];
y9=z[ib+1];
t1=cs1*x1+ss1*y9;
t2=cs1*y9-ss1*x1;
ic=ib+m2;
id=ic+m2;
x4=x0+t1;
y4=y8+t2;
x6=x0-t1;
y6=y8-t2;
x2=z[ic ];
y2=z[ic+1];
x3=z[id ];
y3=z[id+1];
t3=cs1*x3+ss1*y3;
t4=cs1*y3-ss1*x3;
x5=x2+t3;
y5=y2+t4;
x7=x2-t3;
y7=y2-t4;
ss2= fft2_tab[itab].sin;
cs2= fft2_tab[itab].cos;
t5=cs2*x5+ss2*y5;
t6=cs2*y5-ss2*x5;
z[ia ]=x4+t5;
z[ia+1]=-(y4+t6);
z[ic ]=x4-t5;
z[ic+1]=-(y4-t6);
t8=cs2*x7+ss2*y7;
t7=cs2*y7-ss2*x7;
z[ib ]=x6+t7;
z[ib+1]=-(y6-t8);
z[id ]=x6-t7;
z[id+1]=-(y6+t8);
itab++;
ia+=2;
if(itab<siz_d4)goto lp3;
}
make_fft2_status=FFT2_ELIMINATE_SPURS;
return;
case FFT2_ELIMINATE_SPURS:
if(no_of_spurs > 0) {
fftx_na=fft2_na;
eliminate_spurs();
}
// Make summed power spectrum.
pwra=&fft2_power_float[fft2_na*siz];
if(wg_waterf_sum_counter == 0) {
for(i=0; i<siz; i++) {
pwra[i]=z[2*i ]*z[2*i ]+z[2*i+1]*z[2*i+1];
fft2_powersum_float[i]=pwra[i];
}
} else {
for(i=0; i<siz; i++) {
pwra[i]=z[2*i ]*z[2*i ]+z[2*i+1]*z[2*i+1];
fft2_powersum_float[i]+=pwra[i];
}
}
wg_waterf_sum_counter++;
if(genparm[MAX_NO_OF_SPURS] > 0) {
if(spursearch_sum_counter > 3*spur_speknum) {
spursearch_sum_counter=0;
for(i=spur_search_first_point; i <= spur_search_last_point; i++) {
spursearch_spectrum[i]=spursearch_powersum[i]+pwra[i];
}
spursearch_spectrum_cleanup();
} else {
if(spursearch_sum_counter == 0) {
for(i=spur_search_first_point; i <= spur_search_last_point; i++) {
spursearch_powersum[i]=pwra[i];
}
} else {
for(i=spur_search_first_point; i <= spur_search_last_point; i++) {
spursearch_powersum[i]+=pwra[i];
}
}
spursearch_sum_counter++;
}
}
if(wg_waterf_sum_counter < wg.waterfall_avgnum)break;
make_fft2_status=FFT2_WATERFALL_LINE;
return;
case FFT2_WATERFALL_LINE:
// A new summed power spectrum has arrived.
// Convert it from linear power scale to log in units of 0.1dB.
// Expand or contract so we get the number of pixels that
// will fit on the screen.
// Store at the pos of our current line in waterfall
a2=1;
if(wg.xpoints_per_pixel >0) {
a2=wg.xpoints_per_pixel;
} else {
a2=1./wg.pixels_per_xpoint;
}
a3=wg.first_xpoint+0.5*a2;
if(hgwat_xpoints_per_pixel == 1 || hgwat_pixels_per_xpoint == 1) {
i=hgwat_first_xpoint;
for(ix=0; ix < wg_xpixels; ix++) {
itab=a3;
a3+=a2;
y=1000.*log10(fft2_powersum_float[i]*wg_waterf_yfac[itab]);
if(y < -32767)y=-32767;
if(y>32767)y=32767;
wg_waterf[wg_waterf_ptr+ix]=y;
i++;
}
} else {
if(hgwat_xpoints_per_pixel == 0) {
// There are more pixels than data points so we must interpolate.
i=hgwat_first_xpoint;
itab=a3;
a3+=a2;
y=1000.*log10(fft2_powersum_float[i]*wg_waterf_yfac[itab]);
yval=y;
if(y < -32767)y=-32767;
if(y>32767)y=32767;
wg_waterf[wg_waterf_ptr]=y;
i++;
m=wg_xpixels-hgwat_pixels_per_xpoint;
for(ix=0; ix<m; ix+=hgwat_pixels_per_xpoint) {
itab=a3;
a3+=a2;
r1=1000.*log10(fft2_powersum_float[i]*wg_waterf_yfac[itab]);
der=(r1-yval)/hgwat_pixels_per_xpoint;
for(k=ix+1; k<=ix+hgwat_pixels_per_xpoint; k++) {
yval=yval+der;
y=yval;
if(y < -32767)y=-32767;
if(y>32767)y=32767;
wg_waterf[wg_waterf_ptr+k]=y;
}
yval=r1;
i++;
}
if(i<fft2_size) {
itab=a3;
r1=1000.*log10(fft2_powersum_float[i]*wg_waterf_yfac[itab]);
der=(r1-yval)/hgwat_pixels_per_xpoint;
for(k=ix+1; k<=ix+hgwat_pixels_per_xpoint; k++) {
yval=yval+der;
y=yval;
if(y < -32767)y=-32767;
if(y>32767)y=32767;
wg_waterf[wg_waterf_ptr+k]=y;
}
}
} else {
// There is more than one data point for each pixel.
// Make a region ia to ib for the points behind each pixel.
// find the largest value for each region.
ia=hgwat_first_xpoint;
ib=ia+hgwat_xpoints_per_pixel;
for(ix=0; ix<wg_xpixels; ix++) {
r2=0;
k=0;
for(i=ia; i<ib; i++) {
r1=fft2_powersum_float[i];
if(r1 > r2)r2=r1;
}
itab=a3;
a3+=a2;
a1=wg_waterf_yfac[itab];
y=1000.*log10(a1*r2);
if(y < -32767)y=-32767;
if(y>32767)y=32767;
wg_waterf[wg_waterf_ptr+ix]=y;
ia=ib;
ib+=hgwat_xpoints_per_pixel;
if(ib >= siz)ib=siz;
}
}
}
update_wg_waterf();
fft2_liminfo_cnt++;
break;
default:
break;
}
} else {
switch (make_fft2_status) {
case FFT2_NOT_ACTIVE:
mask=timf2_mask;
if(FFT2_CURMODE == 15) {
ya=&fft2_xypower[fft2_na*siz];
mask=timf2_mask;
mm=twice_rxchan;
for(j=0; j<mm; j+=2) {
p0=timf2_px;
if(genparm[SECOND_FFT_SINPOW] != 0) {
for(i=0; i<siz; i++) {
fftxy[2*i ]=fft2_window[i]*(timf2_float[p0+j ]+timf2_float[p0+j+4]);
fftxy[2*i+1]=fft2_window[i]*(timf2_float[p0+j+1]+timf2_float[p0+j+5]);
p0=(p0+8)&mask;
}
} else {
for(i=0; i<siz; i++) {
fftxy[2*i ]=timf2_float[p0+j ]+timf2_float[p0+j+4];
fftxy[2*i+1]=timf2_float[p0+j+1]+timf2_float[p0+j+5];
p0=(p0+8)&mask;
}
}
big_fftforward(siz, fft2_n, fftxy,
fft2_tab, fft2_bigpermute, yieldflag_fft2_fft2);
fftxy=(float*)(ya);
}
fftxy=&fft2_float[fft2_pa];
fftab=(float*)(ya);
for(i=siz-1; i>=0; i--) {
fftxy[4*i+3]=fftab[2*i+1];
fftxy[4*i+2]=fftab[2*i ];
fftxy[4*i+1]=fftxy[2*i+1];
fftxy[4*i ]=fftxy[2*i ];
}
make_fft2_status=FFT2_ELIMINATE_SPURS;
return;
}
fft2_chunk_counter=2;
fft2_inc=siz/16;
fft2_m1=64;
fft2_m2=16;
if(FFT2_CURMODE == 16) {
make_fft2_status=FFT2_B;
} else {
// Use MMX routines
lirerr(995348);
make_fft2_status=FFT2_MMXB;
return;
}
p0=timf2_px;
if(genparm[SECOND_FFT_SINPOW] == 0) {
for(j=0; j<siz; j+=4) {
ia=(p0+8*fft2_bigpermute[j ])&mask;
ib=(p0+8*fft2_bigpermute[j+1])&mask;
ic=(p0+8*fft2_bigpermute[j+2])&mask;
id=(p0+8*fft2_bigpermute[j+3])&mask;
t1= timf2_float[ia ]+timf2_float[ib ]+
timf2_float[ia+4]+timf2_float[ib+4];
t2=-(timf2_float[ia+1]+timf2_float[ib+1]+
timf2_float[ia+5]+timf2_float[ib+5]);
r1= timf2_float[ia+2]+timf2_float[ib+2]+
timf2_float[ia+6]+timf2_float[ib+6];
r2=-(timf2_float[ia+3]+timf2_float[ib+3]+
timf2_float[ia+7]+timf2_float[ib+7]);
t3= timf2_float[ic ]+timf2_float[id ]+
timf2_float[ic+4]+timf2_float[id+4];
t4=-(timf2_float[ic+1]+timf2_float[id+1]+
timf2_float[ic+5]+timf2_float[id+5]);
r3= timf2_float[ic+2]+timf2_float[id+2]+
timf2_float[ic+6]+timf2_float[id+6];
r4=-(timf2_float[ic+3]+timf2_float[id+3]+
timf2_float[ic+7]+timf2_float[id+7]);
t5=(float)(timf2_float[ia ])-(float)(timf2_float[ib ])+
(float)(timf2_float[ia+4])-(float)(timf2_float[ib+4]);
t7=-((float)(timf2_float[ia+1])-(float)(timf2_float[ib+1])+
(float)(timf2_float[ia+5])-(float)(timf2_float[ib+5]));
r5=(float)(timf2_float[ia+2])-(float)(timf2_float[ib+2])+
(float)(timf2_float[ia+6])-(float)(timf2_float[ib+6]);
r7=-((float)(timf2_float[ia+3])-(float)(timf2_float[ib+3])+
(float)(timf2_float[ia+7])-(float)(timf2_float[ib+7]));
t10=(float)(timf2_float[ic ])-(float)(timf2_float[id ])+
(float)(timf2_float[ic+4])-(float)(timf2_float[id+4]);
t6= -((float)(timf2_float[ic+1])-(float)(timf2_float[id+1])+
(float)(timf2_float[ic+5])-(float)(timf2_float[id+5]));
r10=(float)(timf2_float[ic+2])-(float)(timf2_float[id+2])+
(float)(timf2_float[ic+6])-(float)(timf2_float[id+6]);
r6= -((float)(timf2_float[ic+3])-(float)(timf2_float[id+3])+
(float)(timf2_float[ic+7])-(float)(timf2_float[id+7]));
fftxy[4*j ]=t1+t3;
fftxy[4*j+1]=(t2+t4);
fftxy[4*j+2]=r1+r3;
fftxy[4*j+3]=(r2+r4);
fftxy[4*j+8]=t1-t3;
fftxy[4*j+9]=(t2-t4);
fftxy[4*j+10]=r1-r3;
fftxy[4*j+11]=(r2-r4);
t11=t5-t6;
t8=t7-t10;
r11=r5-r6;
r8=r7-r10;
t12=t5+t6;
t9=t7+t10;
r12=r5+r6;
r9=r7+r10;
fftxy[4*j+4]=t12;
fftxy[4*j+5]=t8;
fftxy[4*j+6]=r12;
fftxy[4*j+7]=r8;
fftxy[4*j+12]=t11;
fftxy[4*j+13]=t9;
fftxy[4*j+14]=r11;
fftxy[4*j+15]=r9;
}
} else {
for(j=0; j<siz; j+=4) {
ja=fft2_bigpermute[j ];
jb=fft2_bigpermute[j+1];
jc=fft2_bigpermute[j+2];
jd=fft2_bigpermute[j+3];
ia=(p0+8*ja)&mask;
ib=(p0+8*jb)&mask;
ic=(p0+8*jc)&mask;
id=(p0+8*jd)&mask;
a1=fft2_window[ja]*(timf2_float[ia ]+timf2_float[ia+4]);
a2=fft2_window[ja]*(timf2_float[ia+1]+timf2_float[ia+5]);
a3=fft2_window[ja]*(timf2_float[ia+2]+timf2_float[ia+6]);
a4=fft2_window[ja]*(timf2_float[ia+3]+timf2_float[ia+7]);
b1=fft2_window[jb]*(timf2_float[ib ]+timf2_float[ib+4]);
b2=fft2_window[jb]*(timf2_float[ib+1]+timf2_float[ib+5]);
b3=fft2_window[jb]*(timf2_float[ib+2]+timf2_float[ib+6]);
b4=fft2_window[jb]*(timf2_float[ib+3]+timf2_float[ib+7]);
c1=fft2_window[jc]*(timf2_float[ic ]+timf2_float[ic+4]);
c2=fft2_window[jc]*(timf2_float[ic+1]+timf2_float[ic+5]);
c3=fft2_window[jc]*(timf2_float[ic+2]+timf2_float[ic+6]);
c4=fft2_window[jc]*(timf2_float[ic+3]+timf2_float[ic+7]);
d1=fft2_window[jd]*(timf2_float[id ]+timf2_float[id+4]);
d2=fft2_window[jd]*(timf2_float[id+1]+timf2_float[id+5]);
d3=fft2_window[jd]*(timf2_float[id+2]+timf2_float[id+6]);
d4=fft2_window[jd]*(timf2_float[id+3]+timf2_float[id+7]);
t1=a1+b1;
t2=-(a2+b2);
r1=a3+b3;
r2=-(a4+b4);
t3=c1+d1;
t4=-(c2+d2);
r3=c3+d3;
r4=-(c4+d4);
t5=a1-b1;
t7=-(a2-b2);
r5=a3-b3;
r7=-(a4-b4);
t10=c1-d1;
t6=-( c2-d2);
r10=c3-d3;
r6=-( c4-d4);
fftxy[4*j ]=t1+t3;
fftxy[4*j+1]=t2+t4;
fftxy[4*j+2]=r1+r3;
fftxy[4*j+3]=r2+r4;
fftxy[4*j+8]=t1-t3;
fftxy[4*j+9]=t2-t4;
fftxy[4*j+10]=r1-r3;
fftxy[4*j+11]=r2-r4;
t11=t5-t6;
t8=t7-t10;
r11=r5-r6;
r8=r7-r10;
t12=t5+t6;
t9=t7+t10;
r12=r5+r6;
r9=r7+r10;
fftxy[4*j+4]=t12;
fftxy[4*j+5]=t8;
fftxy[4*j+6]=r12;
fftxy[4*j+7]=r8;
fftxy[4*j+12]=t11;
fftxy[4*j+13]=t9;
fftxy[4*j+14]=r11;
fftxy[4*j+15]=r9;
}
}
return;
case FFT2_MMXB:
case FFT2_MMXC:
lirerr(995349);
return;
case FFT2_B:
siz_d4=siz/4;
siz_m4=siz*4;
n1=fft2_chunk_counter;
n2=n1+fft2_chunk_n;
if(n2 >= fft2_n-2) {
n2=fft2_n-2;
make_fft2_status=FFT2_C;
}
fft2_chunk_counter=n2;
for(n=n1; n<n2; n+=2) {
inc=fft2_inc;
m2=fft2_m2;
for(j=0; j<siz_m4; j+=fft2_m1) {
itab=0;
ia=j;
lp2:
;
ib=ia+m2;
ss1= fft2_tab[2*itab].sin;
cs1= fft2_tab[2*itab].cos;
ss2= fft2_tab[itab].sin;
cs2= fft2_tab[itab].cos;
x0=fftxy[ia ];
y8=fftxy[ia+1];
u0=fftxy[ia+2];
w0=fftxy[ia+3];
x1=fftxy[ib ];
y9=fftxy[ib+1];
u1=fftxy[ib+2];
w1=fftxy[ib+3];
t1=cs1*x1+ss1*y9;
t2=cs1*y9-ss1*x1;
r1=cs1*u1+ss1*w1;
r2=cs1*w1-ss1*u1;
ic=ib+m2;
id=ic+m2;
x4=x0+t1;
y4=y8+t2;
u4=u0+r1;
w4=w0+r2;
x6=x0-t1;
y6=y8-t2;
u6=u0-r1;
w6=w0-r2;
x2=fftxy[ic ];
y2=fftxy[ic+1];
u2=fftxy[ic+2];
w2=fftxy[ic+3];
x3=fftxy[id ];
y3=fftxy[id+1];
u3=fftxy[id+2];
w3=fftxy[id+3];
t3=cs1*x3+ss1*y3;
t4=cs1*y3-ss1*x3;
r3=cs1*u3+ss1*w3;
r4=cs1*w3-ss1*u3;
x5=x2+t3;
y5=y2+t4;
u5=u2+r3;
w5=w2+r4;
x7=x2-t3;
y7=y2-t4;
u7=u2-r3;
w7=w2-r4;
t5=cs2*x5+ss2*y5;
t6=cs2*y5-ss2*x5;
r5=cs2*u5+ss2*w5;
r6=cs2*w5-ss2*u5;
fftxy[ia ]=x4+t5;
fftxy[ia+1]=y4+t6;
fftxy[ia+2]=u4+r5;
fftxy[ia+3]=w4+r6;
fftxy[ic ]=x4-t5;
fftxy[ic+1]=y4-t6;
fftxy[ic+2]=u4-r5;
fftxy[ic+3]=w4-r6;
t8=cs2*x7+ss2*y7;
t7=cs2*y7-ss2*x7;
r8=cs2*u7+ss2*w7;
r7=cs2*w7-ss2*u7;
fftxy[ib ]=x6+t7;
fftxy[ib+1]=y6-t8;
fftxy[ib+2]=u6+r7;
fftxy[ib+3]=w6-r8;
fftxy[id ]=x6-t7;
fftxy[id+1]=y6+t8;
fftxy[id+2]=u6-r7;
fftxy[id+3]=w6+r8;
itab+=inc;
ia+=4;
if(itab<siz_d4)goto lp2;
}
fft2_inc/=4;
fft2_m1*=4;
fft2_m2*=4;
}
return;
case FFT2_C:
if( (fft2_n&1)==1) {
siz_d2=siz/2;
ib=siz*2;
ia=0;
for(itab=0; itab<siz_d2; itab++) {
ss1= fft2_tab[itab].sin;
cs1= fft2_tab[itab].cos;
x0=fftxy[ia ];
y8=fftxy[ia+1];
u0=fftxy[ia+2];
w0=fftxy[ia+3];
x1=fftxy[ib ];
y9=fftxy[ib+1];
u1=fftxy[ib+2];
w1=fftxy[ib+3];
t1=cs1*x1+ss1*y9;
t2=cs1*y9-ss1*x1;
r1=cs1*u1+ss1*w1;
r2=cs1*w1-ss1*u1;
fftxy[ib ]=x0-t1;
fftxy[ib+1]=-(y8-t2);
fftxy[ib+2]=u0-r1;
fftxy[ib+3]=-(w0-r2);
fftxy[ia ]=x0+t1;
fftxy[ia+1]=-(y8+t2);
fftxy[ia+2]=u0+r1;
fftxy[ia+3]=-(w0+r2);
ia+=4;
ib+=4;
}
} else {
siz_d4=siz/4;
siz_m4=siz*4;
for(j=0; j<siz_m4; j+=fft2_m1) {
itab=0;
ia=j;
lp4:
;
ib=ia+siz;
ss1= fft2_tab[2*itab].sin;
cs1= fft2_tab[2*itab].cos;
ss2= fft2_tab[itab].sin;
cs2= fft2_tab[itab].cos;
x0=fftxy[ia ];
y8=fftxy[ia+1];
u0=fftxy[ia+2];
w0=fftxy[ia+3];
x1=fftxy[ib ];
y9=fftxy[ib+1];
u1=fftxy[ib+2];
w1=fftxy[ib+3];
t1=cs1*x1+ss1*y9;
t2=cs1*y9-ss1*x1;
r1=cs1*u1+ss1*w1;
r2=cs1*w1-ss1*u1;
ic=ib+siz;
id=ic+siz;
x4=x0+t1;
y4=y8+t2;
u4=u0+r1;
w4=w0+r2;
x6=x0-t1;
y6=y8-t2;
u6=u0-r1;
w6=w0-r2;
x2=fftxy[ic ];
y2=fftxy[ic+1];
u2=fftxy[ic+2];
w2=fftxy[ic+3];
x3=fftxy[id ];
y3=fftxy[id+1];
u3=fftxy[id+2];
w3=fftxy[id+3];
t3=cs1*x3+ss1*y3;
t4=cs1*y3-ss1*x3;
r3=cs1*u3+ss1*w3;
r4=cs1*w3-ss1*u3;
x5=x2+t3;
y5=y2+t4;
u5=u2+r3;
w5=w2+r4;
x7=x2-t3;
y7=y2-t4;
u7=u2-r3;
w7=w2-r4;
t5=cs2*x5+ss2*y5;
t6=cs2*y5-ss2*x5;
r5=cs2*u5+ss2*w5;
r6=cs2*w5-ss2*u5;
fftxy[ia ]=x4+t5;
fftxy[ia+1]=-(y4+t6);
fftxy[ia+2]=u4+r5;
fftxy[ia+3]=-(w4+r6);
fftxy[ic ]=x4-t5;
fftxy[ic+1]=-(y4-t6);
fftxy[ic+2]=u4-r5;
fftxy[ic+3]=-(w4-r6);
t8=cs2*x7+ss2*y7;
t7=cs2*y7-ss2*x7;
r8=cs2*u7+ss2*w7;
r7=cs2*w7-ss2*u7;
fftxy[ib ]=x6+t7;
fftxy[ib+1]=-(y6-t8);
fftxy[ib+2]=u6+r7;
fftxy[ib+3]=-(w6-r8);
fftxy[id ]=x6-t7;
fftxy[id+1]=-(y6+t8);
fftxy[id+2]=u6-r7;
fftxy[id+3]=-(w6+r8);
itab++;
ia+=4;
if(itab<siz_d4)goto lp4;
}
}
make_fft2_status=FFT2_ELIMINATE_SPURS;
return;
case FFT2_ELIMINATE_SPURS:
if(no_of_spurs > 0) {
fftx_na=fft2_na;
eliminate_spurs();
}
ya=&fft2_xypower[fft2_na*siz];
// Make summed power spectrum and channel correlations.
if(wg_waterf_sum_counter == 0) {