diff options
Diffstat (limited to 'media/libvorbis/lib/vorbis_smallft.c')
| -rw-r--r-- | media/libvorbis/lib/vorbis_smallft.c | 1254 |
1 files changed, 1254 insertions, 0 deletions
diff --git a/media/libvorbis/lib/vorbis_smallft.c b/media/libvorbis/lib/vorbis_smallft.c new file mode 100644 index 0000000000..4ffabab4bb --- /dev/null +++ b/media/libvorbis/lib/vorbis_smallft.c @@ -0,0 +1,1254 @@ +/******************************************************************** + * * + * 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 https://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. + * + * 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)); + } +} |