-/******************************************************************
- * CopyPolicy: GNU Public License 2 applies
- * Copyright (C) 1998 Monty xiphmont@mit.edu, monty@xiph.org
- *
- * FFT implementation from OggSquish, minus cosine transforms,
+/********************************************************************
+ * *
+ * 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
+
+ ********************************************************************/
+
+/* FFT implementation from OggSquish, minus cosine transforms,
* minus all but radix 2/4 case. In Vorbis we only need this
- * cut-down version (used by the encoder, not decoder).
+ * 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, double *wa, int *ifac){
+static void drfti1(int n, float *wa, int *ifac){
static int ntryh[4] = { 4,2,3,5 };
- static double tpi = 6.28318530717958647692528676655900577;
- double arg,argh,argld,fi;
+ 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;
for (j=0;j<ipm;j++){
ld+=l1;
i=is;
- argld=(double)ld*argh;
- fi=0.;
+ argld=(float)ld*argh;
+ fi=0.f;
for (ii=2;ii<ido;ii+=2){
- fi+=1.;
- arg=fi*argld;
- wa[i++]=cos(arg);
- wa[i++]=sin(arg);
+ fi+=1.f;
+ arg=fi*argld;
+ wa[i++]=cos(arg);
+ wa[i++]=sin(arg);
}
is+=ido;
}
}
}
-static void fdrffti(int n, double *wsave, int *ifac){
+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,double *cc,double *ch,double *wa1){
+static void dradf2(int ido,int l1,float *cc,float *ch,float *wa1){
int i,k;
- double ti2,tr2;
+ float ti2,tr2;
int t0,t1,t2,t3,t4,t5,t6;
t1=0;
t1+=ido;
t2+=ido;
}
-
+
if(ido<2)return;
if(ido==2)goto L105;
}
}
-static void dradf4(int ido,int l1,double *cc,double *ch,double *wa1,
- double *wa2,double *wa3){
- static double hsqt2 = .70710678118654752440084436210485;
+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;
- double ci2,ci3,ci4,cr2,cr3,cr4,ti1,ti2,ti3,ti4,tr1,tr2,tr3,tr4;
+ 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);
if(ido&1)return;
L105:
-
+
t2=(t1=t0+ido-1)+(t0<<1);
t3=ido<<2;
t4=ido;
}
}
-static void drftf1(int n,double *c,double *ch,double *wa,int *ifac){
+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;
goto L110;
L104:
- return; /* We're restricted to powers of two. just fail */
+ 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;
for(i=0;i<n;i++)c[i]=ch[i];
}
-static void dradb2(int ido,int l1,double *cc,double *ch,double *wa1){
+static void dradb2(int ido,int l1,float *cc,float *ch,float *wa1){
int i,k,t0,t1,t2,t3,t4,t5,t6;
- double ti2,tr2;
+ float ti2,tr2;
t0=l1*ido;
-
+
t1=0;
t2=0;
t3=(ido<<1)-1;
}
}
-static void dradb4(int ido,int l1,double *cc,double *ch,double *wa1,
- double *wa2,double *wa3){
- static double sqrt2=1.4142135623730950488016887242097;
+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;
- double ci2,ci3,ci4,cr2,cr3,cr4,ti1,ti2,ti3,ti4,tr1,tr2,tr3,tr4;
+ 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;
t4=t3+t6;
t5=t1;
tr3=cc[t4-1]+cc[t4-1];
- tr4=cc[t4]+cc[t4];
+ tr4=cc[t4]+cc[t4];
tr1=cc[t3]-cc[(t4+=t6)-1];
tr2=cc[t3]+cc[t4-1];
ch[t5]=tr2+tr3;
}
}
-static void drftb1(int n, double *c, double *ch, double *wa, int *ifac){
+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;
goto L115;
L106:
- return; /* silently fail. we only do powers of two in this version */
+ 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;
for(i=0;i<n;i++)c[i]=ch[i];
}
-void drft_forward(drft_lookup *l,double *data){
+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,double *data){
- int i;
- double n1=1./l->n;
+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);
- for(i=0;i<l->n;i++)data[i]*=n1;
}
void drft_init(drft_lookup *l,int n){
l->n=n;
- l->trigcache=calloc(3*n,sizeof(double));
- l->splitcache=calloc(32,sizeof(int));
+ 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)free(l->trigcache);
- if(l->splitcache)free(l->splitcache);
- memset(l,0,sizeof(drft_lookup));
+ if(l->trigcache)_ogg_free(l->trigcache);
+ if(l->splitcache)_ogg_free(l->splitcache);
+ memset(l,0,sizeof(*l));
}
}
projects / platform / upstream / libvorbis.git / blobdiff