git.joshuawise.com / patchfork.git / blame
| Commit | Line | Data |
|---|---|---|
| 964dd0bc JW |
1 | /* JOrbis |
| 2 | * Copyright (C) 2000 ymnk, JCraft,Inc. | |
| 3 | * | |
| 4 | * Written by: 2000 ymnk<ymnk@jcraft.com> | |
| 5 | * | |
| 6 | * Many thanks to | |
| 7 | * Monty <monty@xiph.org> and | |
| 8 | * The XIPHOPHORUS Company http://www.xiph.org/ . | |
| 9 | * JOrbis has been based on their awesome works, Vorbis codec. | |
| 10 | * | |
| 11 | * This program is free software; you can redistribute it and/or | |
| 12 | * modify it under the terms of the GNU Library General Public License | |
| 13 | * as published by the Free Software Foundation; either version 2 of | |
| 14 | * the License, or (at your option) any later version. | |
| 15 | ||
| 16 | * This program is distributed in the hope that it will be useful, | |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 | * GNU Library General Public License for more details. | |
| 20 | * | |
| 21 | * You should have received a copy of the GNU Library General Public | |
| 22 | * License along with this program; if not, write to the Free Software | |
| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 24 | */ | |
| 25 | ||
| 26 | package com.jcraft.jorbis; | |
| 27 | ||
| 28 | class Drft{ | |
| 29 | int n; | |
| 30 | float[] trigcache; | |
| 31 | int[] splitcache; | |
| 32 | ||
| 33 | void backward(float[] data){ | |
| 34 | //System.err.println("Drft.backward"); | |
| 35 | if(n==1)return; | |
| 36 | drftb1(n,data,trigcache,trigcache,n,splitcache); | |
| 37 | } | |
| 38 | ||
| 39 | void init(int n){ | |
| 40 | //System.err.println("Drft.init"); | |
| 41 | this.n=n; | |
| 42 | trigcache=new float[3*n]; | |
| 43 | splitcache=new int[32]; | |
| 44 | fdrffti(n, trigcache, splitcache); | |
| 45 | } | |
| 46 | ||
| 47 | void clear(){ | |
| 48 | //System.err.println("Drft.clear"); | |
| 49 | if(trigcache!=null)trigcache=null; | |
| 50 | if(splitcache!=null)splitcache=null; | |
| 51 | // memset(l,0,sizeof(drft_lookup)); | |
| 52 | } | |
| 53 | ||
| 54 | static int[] ntryh = { 4,2,3,5 }; | |
| 55 | static float tpi = 6.28318530717958647692528676655900577f; | |
| 56 | static float hsqt2 = .70710678118654752440084436210485f; | |
| 57 | static float taui = .86602540378443864676372317075293618f; | |
| 58 | static float taur = -.5f; | |
| 59 | static float sqrt2 = 1.4142135623730950488016887242097f; | |
| 60 | ||
| 61 | static void drfti1(int n, float[] wa, int index, int[] ifac){ | |
| 62 | float arg,argh,argld,fi; | |
| 63 | int ntry=0,i,j=-1; | |
| 64 | int k1, l1, l2, ib; | |
| 65 | int ld, ii, ip, is, nq, nr; | |
| 66 | int ido, ipm, nfm1; | |
| 67 | int nl=n; | |
| 68 | int nf=0; | |
| 69 | ||
| 70 | int state=101; | |
| 71 | ||
| 72 | loop: while(true){ | |
| 73 | switch(state){ | |
| 74 | case 101: | |
| 75 | j++; | |
| 76 | if (j < 4) | |
| 77 | ntry=ntryh[j]; | |
| 78 | else | |
| 79 | ntry+=2; | |
| 80 | case 104: | |
| 81 | nq=nl/ntry; | |
| 82 | nr=nl-ntry*nq; | |
| 83 | if(nr!=0){ | |
| 84 | state=101; | |
| 85 | break; | |
| 86 | } | |
| 87 | nf++; | |
| 88 | ifac[nf+1]=ntry; | |
| 89 | nl=nq; | |
| 90 | if(ntry!=2){ | |
| 91 | state=107; | |
| 92 | break; | |
| 93 | } | |
| 94 | if(nf==1){ | |
| 95 | state=107; | |
| 96 | break; | |
| 97 | } | |
| 98 | ||
| 99 | for(i=1;i<nf;i++){ | |
| 100 | ib=nf-i+1; | |
| 101 | ifac[ib+1]=ifac[ib]; | |
| 102 | } | |
| 103 | ifac[2] = 2; | |
| 104 | case 107: | |
| 105 | if(nl!=1){ | |
| 106 | state=104; | |
| 107 | break; | |
| 108 | } | |
| 109 | ifac[0]=n; | |
| 110 | ifac[1]=nf; | |
| 111 | argh=tpi/n; | |
| 112 | is=0; | |
| 113 | nfm1=nf-1; | |
| 114 | l1=1; | |
| 115 | ||
| 116 | if(nfm1==0)return; | |
| 117 | ||
| 118 | for (k1=0;k1<nfm1;k1++){ | |
| 119 | ip=ifac[k1+2]; | |
| 120 | ld=0; | |
| 121 | l2=l1*ip; | |
| 122 | ido=n/l2; | |
| 123 | ipm=ip-1; | |
| 124 | ||
| 125 | for (j=0;j<ipm;j++){ | |
| 126 | ld+=l1; | |
| 127 | i=is; | |
| 128 | argld=(float)ld*argh; | |
| 129 | fi=0.f; | |
| 130 | for (ii=2;ii<ido;ii+=2){ | |
| 131 | fi+=1.f; | |
| 132 | arg=fi*argld; | |
| 133 | wa[index+i++]=(float)Math.cos(arg); | |
| 134 | wa[index+i++]=(float)Math.sin(arg); | |
| 135 | } | |
| 136 | is+=ido; | |
| 137 | } | |
| 138 | l1=l2; | |
| 139 | } | |
| 140 | break loop; | |
| 141 | } | |
| 142 | } | |
| 143 | } | |
| 144 | ||
| 145 | static void fdrffti(int n, float[] wsave, int[] ifac){ | |
| 146 | //System.err.println("fdrffti: n="+n); | |
| 147 | if(n == 1) return; | |
| 148 | drfti1(n, wsave, n, ifac); | |
| 149 | } | |
| 150 | ||
| 151 | static void dradf2(int ido,int l1,float[] cc, float[] ch, float[] wa1, int index){ | |
| 152 | int i,k; | |
| 153 | float ti2,tr2; | |
| 154 | int t0,t1,t2,t3,t4,t5,t6; | |
| 155 | ||
| 156 | t1=0; | |
| 157 | t0=(t2=l1*ido); | |
| 158 | t3=ido<<1; | |
| 159 | for(k=0;k<l1;k++){ | |
| 160 | ch[t1<<1]=cc[t1]+cc[t2]; | |
| 161 | ch[(t1<<1)+t3-1]=cc[t1]-cc[t2]; | |
| 162 | t1+=ido; | |
| 163 | t2+=ido; | |
| 164 | } | |
| 165 | ||
| 166 | if(ido<2)return; | |
| 167 | ||
| 168 | if(ido!=2){ | |
| 169 | t1=0; | |
| 170 | t2=t0; | |
| 171 | for(k=0;k<l1;k++){ | |
| 172 | t3=t2; | |
| 173 | t4=(t1<<1)+(ido<<1); | |
| 174 | t5=t1; | |
| 175 | t6=t1+t1; | |
| 176 | for(i=2;i<ido;i+=2){ | |
| 177 | t3+=2; | |
| 178 | t4-=2; | |
| 179 | t5+=2; | |
| 180 | t6+=2; | |
| 181 | tr2=wa1[index+i-2]*cc[t3-1]+wa1[index+i-1]*cc[t3]; | |
| 182 | ti2=wa1[index+i-2]*cc[t3]-wa1[index+i-1]*cc[t3-1]; | |
| 183 | ch[t6]=cc[t5]+ti2; | |
| 184 | ch[t4]=ti2-cc[t5]; | |
| 185 | ch[t6-1]=cc[t5-1]+tr2; | |
| 186 | ch[t4-1]=cc[t5-1]-tr2; | |
| 187 | } | |
| 188 | t1+=ido; | |
| 189 | t2+=ido; | |
| 190 | } | |
| 191 | if(ido%2==1)return; | |
| 192 | } | |
| 193 | ||
| 194 | t3=(t2=(t1=ido)-1); | |
| 195 | t2+=t0; | |
| 196 | for(k=0;k<l1;k++){ | |
| 197 | ch[t1]=-cc[t2]; | |
| 198 | ch[t1-1]=cc[t3]; | |
| 199 | t1+=ido<<1; | |
| 200 | t2+=ido; | |
| 201 | t3+=ido; | |
| 202 | } | |
| 203 | } | |
| 204 | ||
| 205 | static void dradf4(int ido,int l1,float[] cc, float[] ch, | |
| 206 | float[] wa1, int index1, | |
| 207 | float[] wa2, int index2, | |
| 208 | float[] wa3, int index3){ | |
| 209 | int i,k,t0,t1,t2,t3,t4,t5,t6; | |
| 210 | float ci2,ci3,ci4,cr2,cr3,cr4,ti1,ti2,ti3,ti4,tr1,tr2,tr3,tr4; | |
| 211 | t0=l1*ido; | |
| 212 | ||
| 213 | t1=t0; | |
| 214 | t4=t1<<1; | |
| 215 | t2=t1+(t1<<1); | |
| 216 | t3=0; | |
| 217 | ||
| 218 | for(k=0;k<l1;k++){ | |
| 219 | tr1=cc[t1]+cc[t2]; | |
| 220 | tr2=cc[t3]+cc[t4]; | |
| 221 | ||
| 222 | ch[t5=t3<<2]=tr1+tr2; | |
| 223 | ch[(ido<<2)+t5-1]=tr2-tr1; | |
| 224 | ch[(t5+=(ido<<1))-1]=cc[t3]-cc[t4]; | |
| 225 | ch[t5]=cc[t2]-cc[t1]; | |
| 226 | ||
| 227 | t1+=ido; | |
| 228 | t2+=ido; | |
| 229 | t3+=ido; | |
| 230 | t4+=ido; | |
| 231 | } | |
| 232 | if(ido<2)return; | |
| 233 | ||
| 234 | if(ido!=2){ | |
| 235 | t1=0; | |
| 236 | for(k=0;k<l1;k++){ | |
| 237 | t2=t1; | |
| 238 | t4=t1<<2; | |
| 239 | t5=(t6=ido<<1)+t4; | |
| 240 | for(i=2;i<ido;i+=2){ | |
| 241 | t3=(t2+=2); | |
| 242 | t4+=2; | |
| 243 | t5-=2; | |
| 244 | ||
| 245 | t3+=t0; | |
| 246 | cr2=wa1[index1+i-2]*cc[t3-1]+wa1[index1+i-1]*cc[t3]; | |
| 247 | ci2=wa1[index1+i-2]*cc[t3]-wa1[index1+i-1]*cc[t3-1]; | |
| 248 | t3+=t0; | |
| 249 | cr3=wa2[index2+i-2]*cc[t3-1]+wa2[index2+i-1]*cc[t3]; | |
| 250 | ci3=wa2[index2+i-2]*cc[t3]-wa2[index2+i-1]*cc[t3-1]; | |
| 251 | t3+=t0; | |
| 252 | cr4=wa3[index3+i-2]*cc[t3-1]+wa3[index3+i-1]*cc[t3]; | |
| 253 | ci4=wa3[index3+i-2]*cc[t3]-wa3[index3+i-1]*cc[t3-1]; | |
| 254 | ||
| 255 | tr1=cr2+cr4; | |
| 256 | tr4=cr4-cr2; | |
| 257 | ti1=ci2+ci4; | |
| 258 | ti4=ci2-ci4; | |
| 259 | ||
| 260 | ti2=cc[t2]+ci3; | |
| 261 | ti3=cc[t2]-ci3; | |
| 262 | tr2=cc[t2-1]+cr3; | |
| 263 | tr3=cc[t2-1]-cr3; | |
| 264 | ||
| 265 | ch[t4-1]=tr1+tr2; | |
| 266 | ch[t4]=ti1+ti2; | |
| 267 | ||
| 268 | ch[t5-1]=tr3-ti4; | |
| 269 | ch[t5]=tr4-ti3; | |
| 270 | ||
| 271 | ch[t4+t6-1]=ti4+tr3; | |
| 272 | ch[t4+t6]=tr4+ti3; | |
| 273 | ||
| 274 | ch[t5+t6-1]=tr2-tr1; | |
| 275 | ch[t5+t6]=ti1-ti2; | |
| 276 | } | |
| 277 | t1+=ido; | |
| 278 | } | |
| 279 | if((ido&1)!=0)return; | |
| 280 | } | |
| 281 | ||
| 282 | t2=(t1=t0+ido-1)+(t0<<1); | |
| 283 | t3=ido<<2; | |
| 284 | t4=ido; | |
| 285 | t5=ido<<1; | |
| 286 | t6=ido; | |
| 287 | ||
| 288 | for(k=0;k<l1;k++){ | |
| 289 | ti1=-hsqt2*(cc[t1]+cc[t2]); | |
| 290 | tr1=hsqt2*(cc[t1]-cc[t2]); | |
| 291 | ||
| 292 | ch[t4-1]=tr1+cc[t6-1]; | |
| 293 | ch[t4+t5-1]=cc[t6-1]-tr1; | |
| 294 | ||
| 295 | ch[t4]=ti1-cc[t1+t0]; | |
| 296 | ch[t4+t5]=ti1+cc[t1+t0]; | |
| 297 | ||
| 298 | t1+=ido; | |
| 299 | t2+=ido; | |
| 300 | t4+=t3; | |
| 301 | t6+=ido; | |
| 302 | } | |
| 303 | } | |
| 304 | ||
| 305 | static void dradfg(int ido,int ip,int l1,int idl1,float[] cc,float[] c1, | |
| 306 | float[] c2, float[] ch, float[] ch2, float[] wa, int index){ | |
| 307 | int idij,ipph,i,j,k,l,ic,ik,is; | |
| 308 | int t0,t1,t2=0,t3,t4,t5,t6,t7,t8,t9,t10; | |
| 309 | float dc2,ai1,ai2,ar1,ar2,ds2; | |
| 310 | int nbd; | |
| 311 | float dcp=0,arg,dsp=0,ar1h,ar2h; | |
| 312 | int idp2,ipp2; | |
| 313 | ||
| 314 | arg=tpi/(float)ip; | |
| 315 | dcp=(float)Math.cos(arg); | |
| 316 | dsp=(float)Math.sin(arg); | |
| 317 | ipph=(ip+1)>>1; | |
| 318 | ipp2=ip; | |
| 319 | idp2=ido; | |
| 320 | nbd=(ido-1)>>1; | |
| 321 | t0=l1*ido; | |
| 322 | t10=ip*ido; | |
| 323 | ||
| 324 | int state=100; | |
| 325 | loop: while(true){ | |
| 326 | switch(state){ | |
| 327 | case 101: | |
| 328 | if(ido==1){ | |
| 329 | state=119; | |
| 330 | break; | |
| 331 | } | |
| 332 | for(ik=0;ik<idl1;ik++)ch2[ik]=c2[ik]; | |
| 333 | ||
| 334 | t1=0; | |
| 335 | for(j=1;j<ip;j++){ | |
| 336 | t1+=t0; | |
| 337 | t2=t1; | |
| 338 | for(k=0;k<l1;k++){ | |
| 339 | ch[t2]=c1[t2]; | |
| 340 | t2+=ido; | |
| 341 | } | |
| 342 | } | |
| 343 | ||
| 344 | is=-ido; | |
| 345 | t1=0; | |
| 346 | if(nbd>l1){ | |
| 347 | for(j=1;j<ip;j++){ | |
| 348 | t1+=t0; | |
| 349 | is+=ido; | |
| 350 | t2= -ido+t1; | |
| 351 | for(k=0;k<l1;k++){ | |
| 352 | idij=is-1; | |
| 353 | t2+=ido; | |
| 354 | t3=t2; | |
| 355 | for(i=2;i<ido;i+=2){ | |
| 356 | idij+=2; | |
| 357 | t3+=2; | |
| 358 | ch[t3-1]=wa[index+idij-1]*c1[t3-1]+wa[index+idij]*c1[t3]; | |
| 359 | ch[t3]=wa[index+idij-1]*c1[t3]-wa[index+idij]*c1[t3-1]; | |
| 360 | } | |
| 361 | } | |
| 362 | } | |
| 363 | } | |
| 364 | else{ | |
| 365 | ||
| 366 | for(j=1;j<ip;j++){ | |
| 367 | is+=ido; | |
| 368 | idij=is-1; | |
| 369 | t1+=t0; | |
| 370 | t2=t1; | |
| 371 | for(i=2;i<ido;i+=2){ | |
| 372 | idij+=2; | |
| 373 | t2+=2; | |
| 374 | t3=t2; | |
| 375 | for(k=0;k<l1;k++){ | |
| 376 | ch[t3-1]=wa[index+idij-1]*c1[t3-1]+wa[index+idij]*c1[t3]; | |
| 377 | ch[t3]=wa[index+idij-1]*c1[t3]-wa[index+idij]*c1[t3-1]; | |
| 378 | t3+=ido; | |
| 379 | } | |
| 380 | } | |
| 381 | } | |
| 382 | } | |
| 383 | ||
| 384 | t1=0; | |
| 385 | t2=ipp2*t0; | |
| 386 | if(nbd<l1){ | |
| 387 | for(j=1;j<ipph;j++){ | |
| 388 | t1+=t0; | |
| 389 | t2-=t0; | |
| 390 | t3=t1; | |
| 391 | t4=t2; | |
| 392 | for(i=2;i<ido;i+=2){ | |
| 393 | t3+=2; | |
| 394 | t4+=2; | |
| 395 | t5=t3-ido; | |
| 396 | t6=t4-ido; | |
| 397 | for(k=0;k<l1;k++){ | |
| 398 | t5+=ido; | |
| 399 | t6+=ido; | |
| 400 | c1[t5-1]=ch[t5-1]+ch[t6-1]; | |
| 401 | c1[t6-1]=ch[t5]-ch[t6]; | |
| 402 | c1[t5]=ch[t5]+ch[t6]; | |
| 403 | c1[t6]=ch[t6-1]-ch[t5-1]; | |
| 404 | } | |
| 405 | } | |
| 406 | } | |
| 407 | } | |
| 408 | else{ | |
| 409 | for(j=1;j<ipph;j++){ | |
| 410 | t1+=t0; | |
| 411 | t2-=t0; | |
| 412 | t3=t1; | |
| 413 | t4=t2; | |
| 414 | for(k=0;k<l1;k++){ | |
| 415 | t5=t3; | |
| 416 | t6=t4; | |
| 417 | for(i=2;i<ido;i+=2){ | |
| 418 | t5+=2; | |
| 419 | t6+=2; | |
| 420 | c1[t5-1]=ch[t5-1]+ch[t6-1]; | |
| 421 | c1[t6-1]=ch[t5]-ch[t6]; | |
| 422 | c1[t5]=ch[t5]+ch[t6]; | |
| 423 | c1[t6]=ch[t6-1]-ch[t5-1]; | |
| 424 | } | |
| 425 | t3+=ido; | |
| 426 | t4+=ido; | |
| 427 | } | |
| 428 | } | |
| 429 | } | |
| 430 | case 119: | |
| 431 | for(ik=0;ik<idl1;ik++)c2[ik]=ch2[ik]; | |
| 432 | ||
| 433 | t1=0; | |
| 434 | t2=ipp2*idl1; | |
| 435 | for(j=1;j<ipph;j++){ | |
| 436 | t1+=t0; | |
| 437 | t2-=t0; | |
| 438 | t3=t1-ido; | |
| 439 | t4=t2-ido; | |
| 440 | for(k=0;k<l1;k++){ | |
| 441 | t3+=ido; | |
| 442 | t4+=ido; | |
| 443 | c1[t3]=ch[t3]+ch[t4]; | |
| 444 | c1[t4]=ch[t4]-ch[t3]; | |
| 445 | } | |
| 446 | } | |
| 447 | ||
| 448 | ar1=1.f; | |
| 449 | ai1=0.f; | |
| 450 | t1=0; | |
| 451 | t2=ipp2*idl1; | |
| 452 | t3=(ip-1)*idl1; | |
| 453 | for(l=1;l<ipph;l++){ | |
| 454 | t1+=idl1; | |
| 455 | t2-=idl1; | |
| 456 | ar1h=dcp*ar1-dsp*ai1; | |
| 457 | ai1=dcp*ai1+dsp*ar1; | |
| 458 | ar1=ar1h; | |
| 459 | t4=t1; | |
| 460 | t5=t2; | |
| 461 | t6=t3; | |
| 462 | t7=idl1; | |
| 463 | ||
| 464 | for(ik=0;ik<idl1;ik++){ | |
| 465 | ch2[t4++]=c2[ik]+ar1*c2[t7++]; | |
| 466 | ch2[t5++]=ai1*c2[t6++]; | |
| 467 | } | |
| 468 | ||
| 469 | dc2=ar1; | |
| 470 | ds2=ai1; | |
| 471 | ar2=ar1; | |
| 472 | ai2=ai1; | |
| 473 | ||
| 474 | t4=idl1; | |
| 475 | t5=(ipp2-1)*idl1; | |
| 476 | for(j=2;j<ipph;j++){ | |
| 477 | t4+=idl1; | |
| 478 | t5-=idl1; | |
| 479 | ||
| 480 | ar2h=dc2*ar2-ds2*ai2; | |
| 481 | ai2=dc2*ai2+ds2*ar2; | |
| 482 | ar2=ar2h; | |
| 483 | ||
| 484 | t6=t1; | |
| 485 | t7=t2; | |
| 486 | t8=t4; | |
| 487 | t9=t5; | |
| 488 | for(ik=0;ik<idl1;ik++){ | |
| 489 | ch2[t6++]+=ar2*c2[t8++]; | |
| 490 | ch2[t7++]+=ai2*c2[t9++]; | |
| 491 | } | |
| 492 | } | |
| 493 | } | |
| 494 | t1=0; | |
| 495 | for(j=1;j<ipph;j++){ | |
| 496 | t1+=idl1; | |
| 497 | t2=t1; | |
| 498 | for(ik=0;ik<idl1;ik++)ch2[ik]+=c2[t2++]; | |
| 499 | } | |
| 500 | ||
| 501 | if(ido<l1){ | |
| 502 | state=132; | |
| 503 | break; | |
| 504 | } | |
| 505 | ||
| 506 | t1=0; | |
| 507 | t2=0; | |
| 508 | for(k=0;k<l1;k++){ | |
| 509 | t3=t1; | |
| 510 | t4=t2; | |
| 511 | for(i=0;i<ido;i++)cc[t4++]=ch[t3++]; | |
| 512 | t1+=ido; | |
| 513 | t2+=t10; | |
| 514 | } | |
| 515 | state=135; | |
| 516 | break; | |
| 517 | ||
| 518 | case 132: | |
| 519 | for(i=0;i<ido;i++){ | |
| 520 | t1=i; | |
| 521 | t2=i; | |
| 522 | for(k=0;k<l1;k++){ | |
| 523 | cc[t2]=ch[t1]; | |
| 524 | t1+=ido; | |
| 525 | t2+=t10; | |
| 526 | } | |
| 527 | } | |
| 528 | case 135: | |
| 529 | t1=0; | |
| 530 | t2=ido<<1; | |
| 531 | t3=0; | |
| 532 | t4=ipp2*t0; | |
| 533 | for(j=1;j<ipph;j++){ | |
| 534 | t1+=t2; | |
| 535 | t3+=t0; | |
| 536 | t4-=t0; | |
| 537 | ||
| 538 | t5=t1; | |
| 539 | t6=t3; | |
| 540 | t7=t4; | |
| 541 | ||
| 542 | for(k=0;k<l1;k++){ | |
| 543 | cc[t5-1]=ch[t6]; | |
| 544 | cc[t5]=ch[t7]; | |
| 545 | t5+=t10; | |
| 546 | t6+=ido; | |
| 547 | t7+=ido; | |
| 548 | } | |
| 549 | } | |
| 550 | ||
| 551 | if(ido==1)return; | |
| 552 | if(nbd<l1){ | |
| 553 | state=141; | |
| 554 | break; | |
| 555 | } | |
| 556 | ||
| 557 | t1=-ido; | |
| 558 | t3=0; | |
| 559 | t4=0; | |
| 560 | t5=ipp2*t0; | |
| 561 | for(j=1;j<ipph;j++){ | |
| 562 | t1+=t2; | |
| 563 | t3+=t2; | |
| 564 | t4+=t0; | |
| 565 | t5-=t0; | |
| 566 | t6=t1; | |
| 567 | t7=t3; | |
| 568 | t8=t4; | |
| 569 | t9=t5; | |
| 570 | for(k=0;k<l1;k++){ | |
| 571 | for(i=2;i<ido;i+=2){ | |
| 572 | ic=idp2-i; | |
| 573 | cc[i+t7-1]=ch[i+t8-1]+ch[i+t9-1]; | |
| 574 | cc[ic+t6-1]=ch[i+t8-1]-ch[i+t9-1]; | |
| 575 | cc[i+t7]=ch[i+t8]+ch[i+t9]; | |
| 576 | cc[ic+t6]=ch[i+t9]-ch[i+t8]; | |
| 577 | } | |
| 578 | t6+=t10; | |
| 579 | t7+=t10; | |
| 580 | t8+=ido; | |
| 581 | t9+=ido; | |
| 582 | } | |
| 583 | } | |
| 584 | return; | |
| 585 | case 141: | |
| 586 | t1=-ido; | |
| 587 | t3=0; | |
| 588 | t4=0; | |
| 589 | t5=ipp2*t0; | |
| 590 | for(j=1;j<ipph;j++){ | |
| 591 | t1+=t2; | |
| 592 | t3+=t2; | |
| 593 | t4+=t0; | |
| 594 | t5-=t0; | |
| 595 | for(i=2;i<ido;i+=2){ | |
| 596 | t6=idp2+t1-i; | |
| 597 | t7=i+t3; | |
| 598 | t8=i+t4; | |
| 599 | t9=i+t5; | |
| 600 | for(k=0;k<l1;k++){ | |
| 601 | cc[t7-1]=ch[t8-1]+ch[t9-1]; | |
| 602 | cc[t6-1]=ch[t8-1]-ch[t9-1]; | |
| 603 | cc[t7]=ch[t8]+ch[t9]; | |
| 604 | cc[t6]=ch[t9]-ch[t8]; | |
| 605 | t6+=t10; | |
| 606 | t7+=t10; | |
| 607 | t8+=ido; | |
| 608 | t9+=ido; | |
| 609 | } | |
| 610 | } | |
| 611 | } | |
| 612 | break loop; | |
| 613 | } | |
| 614 | } | |
| 615 | } | |
| 616 | ||
| 617 | static void drftf1(int n,float[] c, float[] ch, float[] wa, int[] ifac){ | |
| 618 | int i,k1,l1,l2; | |
| 619 | int na,kh,nf; | |
| 620 | int ip,iw,ido,idl1,ix2,ix3; | |
| 621 | ||
| 622 | nf=ifac[1]; | |
| 623 | na=1; | |
| 624 | l2=n; | |
| 625 | iw=n; | |
| 626 | ||
| 627 | for(k1=0;k1<nf;k1++){ | |
| 628 | kh=nf-k1; | |
| 629 | ip=ifac[kh+1]; | |
| 630 | l1=l2/ip; | |
| 631 | ido=n/l2; | |
| 632 | idl1=ido*l1; | |
| 633 | iw-=(ip-1)*ido; | |
| 634 | na=1-na; | |
| 635 | ||
| 636 | int state=100; | |
| 637 | loop: while(true){ | |
| 638 | switch(state){ | |
| 639 | case 100: | |
| 640 | if(ip!=4){ | |
| 641 | state=102; | |
| 642 | break; | |
| 643 | } | |
| 644 | ||
| 645 | ix2=iw+ido; | |
| 646 | ix3=ix2+ido; | |
| 647 | if(na!=0) | |
| 648 | dradf4(ido,l1,ch,c,wa,iw-1,wa,ix2-1,wa,ix3-1); | |
| 649 | else | |
| 650 | dradf4(ido,l1,c,ch,wa,iw-1,wa,ix2-1,wa,ix3-1); | |
| 651 | state=110; | |
| 652 | break; | |
| 653 | case 102: | |
| 654 | if(ip!=2){ | |
| 655 | state=104; | |
| 656 | break; | |
| 657 | } | |
| 658 | if(na!=0){ | |
| 659 | state=103; | |
| 660 | break; | |
| 661 | } | |
| 662 | dradf2(ido,l1,c,ch,wa, iw-1); | |
| 663 | state=110; | |
| 664 | break; | |
| 665 | case 103: | |
| 666 | dradf2(ido,l1,ch,c,wa, iw-1); | |
| 667 | case 104: | |
| 668 | if(ido==1)na=1-na; | |
| 669 | if(na!=0){ | |
| 670 | state=109; | |
| 671 | break; | |
| 672 | } | |
| 673 | dradfg(ido,ip,l1,idl1,c,c,c,ch,ch,wa,iw-1); | |
| 674 | na=1; | |
| 675 | state=110; | |
| 676 | break; | |
| 677 | case 109: | |
| 678 | dradfg(ido,ip,l1,idl1,ch,ch,ch,c,c,wa,iw-1); | |
| 679 | na=0; | |
| 680 | case 110: | |
| 681 | l2=l1; | |
| 682 | break loop; | |
| 683 | } | |
| 684 | } | |
| 685 | } | |
| 686 | if(na==1)return; | |
| 687 | for(i=0;i<n;i++)c[i]=ch[i]; | |
| 688 | } | |
| 689 | ||
| 690 | static void dradb2(int ido,int l1,float[] cc,float[] ch,float[] wa1, int index){ | |
| 691 | int i,k,t0,t1,t2,t3,t4,t5,t6; | |
| 692 | float ti2,tr2; | |
| 693 | ||
| 694 | t0=l1*ido; | |
| 695 | ||
| 696 | t1=0; | |
| 697 | t2=0; | |
| 698 | t3=(ido<<1)-1; | |
| 699 | for(k=0;k<l1;k++){ | |
| 700 | ch[t1]=cc[t2]+cc[t3+t2]; | |
| 701 | ch[t1+t0]=cc[t2]-cc[t3+t2]; | |
| 702 | t2=(t1+=ido)<<1; | |
| 703 | } | |
| 704 | ||
| 705 | if(ido<2)return; | |
| 706 | if(ido!=2){ | |
| 707 | t1=0; | |
| 708 | t2=0; | |
| 709 | for(k=0;k<l1;k++){ | |
| 710 | t3=t1; | |
| 711 | t5=(t4=t2)+(ido<<1); | |
| 712 | t6=t0+t1; | |
| 713 | for(i=2;i<ido;i+=2){ | |
| 714 | t3+=2; | |
| 715 | t4+=2; | |
| 716 | t5-=2; | |
| 717 | t6+=2; | |
| 718 | ch[t3-1]=cc[t4-1]+cc[t5-1]; | |
| 719 | tr2=cc[t4-1]-cc[t5-1]; | |
| 720 | ch[t3]=cc[t4]-cc[t5]; | |
| 721 | ti2=cc[t4]+cc[t5]; | |
| 722 | ch[t6-1]=wa1[index+i-2]*tr2-wa1[index+i-1]*ti2; | |
| 723 | ch[t6]=wa1[index+i-2]*ti2+wa1[index+i-1]*tr2; | |
| 724 | } | |
| 725 | t2=(t1+=ido)<<1; | |
| 726 | } | |
| 727 | if((ido%2)==1)return; | |
| 728 | } | |
| 729 | ||
| 730 | t1=ido-1; | |
| 731 | t2=ido-1; | |
| 732 | for(k=0;k<l1;k++){ | |
| 733 | ch[t1]=cc[t2]+cc[t2]; | |
| 734 | ch[t1+t0]=-(cc[t2+1]+cc[t2+1]); | |
| 735 | t1+=ido; | |
| 736 | t2+=ido<<1; | |
| 737 | } | |
| 738 | } | |
| 739 | ||
| 740 | static void dradb3(int ido,int l1,float[] cc,float[] ch, | |
| 741 | float[] wa1, int index1, | |
| 742 | float[] wa2, int index2){ | |
| 743 | int i,k,t0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10; | |
| 744 | float ci2,ci3,di2,di3,cr2,cr3,dr2,dr3,ti2,tr2; | |
| 745 | t0=l1*ido; | |
| 746 | ||
| 747 | t1=0; | |
| 748 | t2=t0<<1; | |
| 749 | t3=ido<<1; | |
| 750 | t4=ido+(ido<<1); | |
| 751 | t5=0; | |
| 752 | for(k=0;k<l1;k++){ | |
| 753 | tr2=cc[t3-1]+cc[t3-1]; | |
| 754 | cr2=cc[t5]+(taur*tr2); | |
| 755 | ch[t1]=cc[t5]+tr2; | |
| 756 | ci3=taui*(cc[t3]+cc[t3]); | |
| 757 | ch[t1+t0]=cr2-ci3; | |
| 758 | ch[t1+t2]=cr2+ci3; | |
| 759 | t1+=ido; | |
| 760 | t3+=t4; | |
| 761 | t5+=t4; | |
| 762 | } | |
| 763 | ||
| 764 | if(ido==1)return; | |
| 765 | ||
| 766 | t1=0; | |
| 767 | t3=ido<<1; | |
| 768 | for(k=0;k<l1;k++){ | |
| 769 | t7=t1+(t1<<1); | |
| 770 | t6=(t5=t7+t3); | |
| 771 | t8=t1; | |
| 772 | t10=(t9=t1+t0)+t0; | |
| 773 | ||
| 774 | for(i=2;i<ido;i+=2){ | |
| 775 | t5+=2; | |
| 776 | t6-=2; | |
| 777 | t7+=2; | |
| 778 | t8+=2; | |
| 779 | t9+=2; | |
| 780 | t10+=2; | |
| 781 | tr2=cc[t5-1]+cc[t6-1]; | |
| 782 | cr2=cc[t7-1]+(taur*tr2); | |
| 783 | ch[t8-1]=cc[t7-1]+tr2; | |
| 784 | ti2=cc[t5]-cc[t6]; | |
| 785 | ci2=cc[t7]+(taur*ti2); | |
| 786 | ch[t8]=cc[t7]+ti2; | |
| 787 | cr3=taui*(cc[t5-1]-cc[t6-1]); | |
| 788 | ci3=taui*(cc[t5]+cc[t6]); | |
| 789 | dr2=cr2-ci3; | |
| 790 | dr3=cr2+ci3; | |
| 791 | di2=ci2+cr3; | |
| 792 | di3=ci2-cr3; | |
| 793 | ch[t9-1]=wa1[index1+i-2]*dr2-wa1[index1+i-1]*di2; | |
| 794 | ch[t9]=wa1[index1+i-2]*di2+wa1[index1+i-1]*dr2; | |
| 795 | ch[t10-1]=wa2[index2+i-2]*dr3-wa2[index2+i-1]*di3; | |
| 796 | ch[t10]=wa2[index2+i-2]*di3+wa2[index2+i-1]*dr3; | |
| 797 | } | |
| 798 | t1+=ido; | |
| 799 | } | |
| 800 | } | |
| 801 | ||
| 802 | static void dradb4(int ido,int l1,float[] cc,float[] ch, | |
| 803 | float[] wa1, int index1, | |
| 804 | float[] wa2, int index2, | |
| 805 | float[] wa3, int index3){ | |
| 806 | int i,k,t0,t1,t2,t3,t4,t5,t6,t7,t8; | |
| 807 | float ci2,ci3,ci4,cr2,cr3,cr4,ti1,ti2,ti3,ti4,tr1,tr2,tr3,tr4; | |
| 808 | t0=l1*ido; | |
| 809 | ||
| 810 | t1=0; | |
| 811 | t2=ido<<2; | |
| 812 | t3=0; | |
| 813 | t6=ido<<1; | |
| 814 | for(k=0;k<l1;k++){ | |
| 815 | t4=t3+t6; | |
| 816 | t5=t1; | |
| 817 | tr3=cc[t4-1]+cc[t4-1]; | |
| 818 | tr4=cc[t4]+cc[t4]; | |
| 819 | tr1=cc[t3]-cc[(t4+=t6)-1]; | |
| 820 | tr2=cc[t3]+cc[t4-1]; | |
| 821 | ch[t5]=tr2+tr3; | |
| 822 | ch[t5+=t0]=tr1-tr4; | |
| 823 | ch[t5+=t0]=tr2-tr3; | |
| 824 | ch[t5+=t0]=tr1+tr4; | |
| 825 | t1+=ido; | |
| 826 | t3+=t2; | |
| 827 | } | |
| 828 | ||
| 829 | if(ido<2)return; | |
| 830 | if(ido!=2){ | |
| 831 | t1=0; | |
| 832 | for(k=0;k<l1;k++){ | |
| 833 | t5=(t4=(t3=(t2=t1<<2)+t6))+t6; | |
| 834 | t7=t1; | |
| 835 | for(i=2;i<ido;i+=2){ | |
| 836 | t2+=2; | |
| 837 | t3+=2; | |
| 838 | t4-=2; | |
| 839 | t5-=2; | |
| 840 | t7+=2; | |
| 841 | ti1=cc[t2]+cc[t5]; | |
| 842 | ti2=cc[t2]-cc[t5]; | |
| 843 | ti3=cc[t3]-cc[t4]; | |
| 844 | tr4=cc[t3]+cc[t4]; | |
| 845 | tr1=cc[t2-1]-cc[t5-1]; | |
| 846 | tr2=cc[t2-1]+cc[t5-1]; | |
| 847 | ti4=cc[t3-1]-cc[t4-1]; | |
| 848 | tr3=cc[t3-1]+cc[t4-1]; | |
| 849 | ch[t7-1]=tr2+tr3; | |
| 850 | cr3=tr2-tr3; | |
| 851 | ch[t7]=ti2+ti3; | |
| 852 | ci3=ti2-ti3; | |
| 853 | cr2=tr1-tr4; | |
| 854 | cr4=tr1+tr4; | |
| 855 | ci2=ti1+ti4; | |
| 856 | ci4=ti1-ti4; | |
| 857 | ||
| 858 | ch[(t8=t7+t0)-1]=wa1[index1+i-2]*cr2-wa1[index1+i-1]*ci2; | |
| 859 | ch[t8]=wa1[index1+i-2]*ci2+wa1[index1+i-1]*cr2; | |
| 860 | ch[(t8+=t0)-1]=wa2[index2+i-2]*cr3-wa2[index2+i-1]*ci3; | |
| 861 | ch[t8]=wa2[index2+i-2]*ci3+wa2[index2+i-1]*cr3; | |
| 862 | ch[(t8+=t0)-1]=wa3[index3+i-2]*cr4-wa3[index3+i-1]*ci4; | |
| 863 | ch[t8]=wa3[index3+i-2]*ci4+wa3[index3+i-1]*cr4; | |
| 864 | } | |
| 865 | t1+=ido; | |
| 866 | } | |
| 867 | if(ido%2 == 1)return; | |
| 868 | } | |
| 869 | ||
| 870 | t1=ido; | |
| 871 | t2=ido<<2; | |
| 872 | t3=ido-1; | |
| 873 | t4=ido+(ido<<1); | |
| 874 | for(k=0;k<l1;k++){ | |
| 875 | t5=t3; | |
| 876 | ti1=cc[t1]+cc[t4]; | |
| 877 | ti2=cc[t4]-cc[t1]; | |
| 878 | tr1=cc[t1-1]-cc[t4-1]; | |
| 879 | tr2=cc[t1-1]+cc[t4-1]; | |
| 880 | ch[t5]=tr2+tr2; | |
| 881 | ch[t5+=t0]=sqrt2*(tr1-ti1); | |
| 882 | ch[t5+=t0]=ti2+ti2; | |
| 883 | ch[t5+=t0]=-sqrt2*(tr1+ti1); | |
| 884 | ||
| 885 | t3+=ido; | |
| 886 | t1+=t2; | |
| 887 | t4+=t2; | |
| 888 | } | |
| 889 | } | |
| 890 | ||
| 891 | static void dradbg(int ido,int ip,int l1,int idl1,float[] cc,float[] c1, | |
| 892 | float[] c2,float[] ch,float[] ch2,float[] wa, int index ){ | |
| 893 | ||
| 894 | int idij,ipph=0,i,j,k,l,ik,is,t0=0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10=0, | |
| 895 | t11,t12; | |
| 896 | float dc2,ai1,ai2,ar1,ar2,ds2; | |
| 897 | int nbd=0; | |
| 898 | float dcp=0,arg,dsp=0,ar1h,ar2h; | |
| 899 | int ipp2=0; | |
| 900 | ||
| 901 | int state=100; | |
| 902 | ||
| 903 | loop: while(true){ | |
| 904 | switch(state){ | |
| 905 | case 100: | |
| 906 | t10=ip*ido; | |
| 907 | t0=l1*ido; | |
| 908 | arg=tpi/(float)ip; | |
| 909 | dcp=(float)Math.cos(arg); | |
| 910 | dsp=(float)Math.sin(arg); | |
| 911 | nbd=(ido-1)>>>1; | |
| 912 | ipp2=ip; | |
| 913 | ipph=(ip+1)>>>1; | |
| 914 | if(ido<l1){ | |
| 915 | state=103; | |
| 916 | break; | |
| 917 | } | |
| 918 | t1=0; | |
| 919 | t2=0; | |
| 920 | for(k=0;k<l1;k++){ | |
| 921 | t3=t1; | |
| 922 | t4=t2; | |
| 923 | for(i=0;i<ido;i++){ | |
| 924 | ch[t3]=cc[t4]; | |
| 925 | t3++; | |
| 926 | t4++; | |
| 927 | } | |
| 928 | t1+=ido; | |
| 929 | t2+=t10; | |
| 930 | } | |
| 931 | state=106; | |
| 932 | break; | |
| 933 | case 103: | |
| 934 | t1=0; | |
| 935 | for(i=0;i<ido;i++){ | |
| 936 | t2=t1; | |
| 937 | t3=t1; | |
| 938 | for(k=0;k<l1;k++){ | |
| 939 | ch[t2]=cc[t3]; | |
| 940 | t2+=ido; | |
| 941 | t3+=t10; | |
| 942 | } | |
| 943 | t1++; | |
| 944 | } | |
| 945 | case 106: | |
| 946 | t1=0; | |
| 947 | t2=ipp2*t0; | |
| 948 | t7=(t5=ido<<1); | |
| 949 | for(j=1;j<ipph;j++){ | |
| 950 | t1+=t0; | |
| 951 | t2-=t0; | |
| 952 | t3=t1; | |
| 953 | t4=t2; | |
| 954 | t6=t5; | |
| 955 | for(k=0;k<l1;k++){ | |
| 956 | ch[t3]=cc[t6-1]+cc[t6-1]; | |
| 957 | ch[t4]=cc[t6]+cc[t6]; | |
| 958 | t3+=ido; | |
| 959 | t4+=ido; | |
| 960 | t6+=t10; | |
| 961 | } | |
| 962 | t5+=t7; | |
| 963 | } | |
| 964 | if (ido == 1){ | |
| 965 | state=116; | |
| 966 | break; | |
| 967 | } | |
| 968 | if(nbd<l1){ | |
| 969 | state=112; | |
| 970 | break; | |
| 971 | } | |
| 972 | ||
| 973 | t1=0; | |
| 974 | t2=ipp2*t0; | |
| 975 | t7=0; | |
| 976 | for(j=1;j<ipph;j++){ | |
| 977 | t1+=t0; | |
| 978 | t2-=t0; | |
| 979 | t3=t1; | |
| 980 | t4=t2; | |
| 981 | ||
| 982 | t7+=(ido<<1); | |
| 983 | t8=t7; | |
| 984 | for(k=0;k<l1;k++){ | |
| 985 | t5=t3; | |
| 986 | t6=t4; | |
| 987 | t9=t8; | |
| 988 | t11=t8; | |
| 989 | for(i=2;i<ido;i+=2){ | |
| 990 | t5+=2; | |
| 991 | t6+=2; | |
| 992 | t9+=2; | |
| 993 | t11-=2; | |
| 994 | ch[t5-1]=cc[t9-1]+cc[t11-1]; | |
| 995 | ch[t6-1]=cc[t9-1]-cc[t11-1]; | |
| 996 | ch[t5]=cc[t9]-cc[t11]; | |
| 997 | ch[t6]=cc[t9]+cc[t11]; | |
| 998 | } | |
| 999 | t3+=ido; | |
| 1000 | t4+=ido; | |
| 1001 | t8+=t10; | |
| 1002 | } | |
| 1003 | } | |
| 1004 | state=116; | |
| 1005 | break; | |
| 1006 | case 112: | |
| 1007 | t1=0; | |
| 1008 | t2=ipp2*t0; | |
| 1009 | t7=0; | |
| 1010 | for(j=1;j<ipph;j++){ | |
| 1011 | t1+=t0; | |
| 1012 | t2-=t0; | |
| 1013 | t3=t1; | |
| 1014 | t4=t2; | |
| 1015 | t7+=(ido<<1); | |
| 1016 | t8=t7; | |
| 1017 | t9=t7; | |
| 1018 | for(i=2;i<ido;i+=2){ | |
| 1019 | t3+=2; | |
| 1020 | t4+=2; | |
| 1021 | t8+=2; | |
| 1022 | t9-=2; | |
| 1023 | t5=t3; | |
| 1024 | t6=t4; | |
| 1025 | t11=t8; | |
| 1026 | t12=t9; | |
| 1027 | for(k=0;k<l1;k++){ | |
| 1028 | ch[t5-1]=cc[t11-1]+cc[t12-1]; | |
| 1029 | ch[t6-1]=cc[t11-1]-cc[t12-1]; | |
| 1030 | ch[t5]=cc[t11]-cc[t12]; | |
| 1031 | ch[t6]=cc[t11]+cc[t12]; | |
| 1032 | t5+=ido; | |
| 1033 | t6+=ido; | |
| 1034 | t11+=t10; | |
| 1035 | t12+=t10; | |
| 1036 | } | |
| 1037 | } | |
| 1038 | } | |
| 1039 | case 116: | |
| 1040 | ar1=1.f; | |
| 1041 | ai1=0.f; | |
| 1042 | t1=0; | |
| 1043 | t9=(t2=ipp2*idl1); | |
| 1044 | t3=(ip-1)*idl1; | |
| 1045 | for(l=1;l<ipph;l++){ | |
| 1046 | t1+=idl1; | |
| 1047 | t2-=idl1; | |
| 1048 | ||
| 1049 | ar1h=dcp*ar1-dsp*ai1; | |
| 1050 | ai1=dcp*ai1+dsp*ar1; | |
| 1051 | ar1=ar1h; | |
| 1052 | t4=t1; | |
| 1053 | t5=t2; | |
| 1054 | t6=0; | |
| 1055 | t7=idl1; | |
| 1056 | t8=t3; | |
| 1057 | for(ik=0;ik<idl1;ik++){ | |
| 1058 | c2[t4++]=ch2[t6++]+ar1*ch2[t7++]; | |
| 1059 | c2[t5++]=ai1*ch2[t8++]; | |
| 1060 | } | |
| 1061 | dc2=ar1; | |
| 1062 | ds2=ai1; | |
| 1063 | ar2=ar1; | |
| 1064 | ai2=ai1; | |
| 1065 | ||
| 1066 | t6=idl1; | |
| 1067 | t7=t9-idl1; | |
| 1068 | for(j=2;j<ipph;j++){ | |
| 1069 | t6+=idl1; | |
| 1070 | t7-=idl1; | |
| 1071 | ar2h=dc2*ar2-ds2*ai2; | |
| 1072 | ai2=dc2*ai2+ds2*ar2; | |
| 1073 | ar2=ar2h; | |
| 1074 | t4=t1; | |
| 1075 | t5=t2; | |
| 1076 | t11=t6; | |
| 1077 | t12=t7; | |
| 1078 | for(ik=0;ik<idl1;ik++){ | |
| 1079 | c2[t4++]+=ar2*ch2[t11++]; | |
| 1080 | c2[t5++]+=ai2*ch2[t12++]; | |
| 1081 | } | |
| 1082 | } | |
| 1083 | } | |
| 1084 | ||
| 1085 | t1=0; | |
| 1086 | for(j=1;j<ipph;j++){ | |
| 1087 | t1+=idl1; | |
| 1088 | t2=t1; | |
| 1089 | for(ik=0;ik<idl1;ik++)ch2[ik]+=ch2[t2++]; | |
| 1090 | } | |
| 1091 | ||
| 1092 | t1=0; | |
| 1093 | t2=ipp2*t0; | |
| 1094 | for(j=1;j<ipph;j++){ | |
| 1095 | t1+=t0; | |
| 1096 | t2-=t0; | |
| 1097 | t3=t1; | |
| 1098 | t4=t2; | |
| 1099 | for(k=0;k<l1;k++){ | |
| 1100 | ch[t3]=c1[t3]-c1[t4]; | |
| 1101 | ch[t4]=c1[t3]+c1[t4]; | |
| 1102 | t3+=ido; | |
| 1103 | t4+=ido; | |
| 1104 | } | |
| 1105 | } | |
| 1106 | ||
| 1107 | if(ido==1){ | |
| 1108 | state=132; | |
| 1109 | break; | |
| 1110 | } | |
| 1111 | if(nbd<l1){ | |
| 1112 | state=128; | |
| 1113 | break; | |
| 1114 | } | |
| 1115 | ||
| 1116 | t1=0; | |
| 1117 | t2=ipp2*t0; | |
| 1118 | for(j=1;j<ipph;j++){ | |
| 1119 | t1+=t0; | |
| 1120 | t2-=t0; | |
| 1121 | t3=t1; | |
| 1122 | t4=t2; | |
| 1123 | for(k=0;k<l1;k++){ | |
| 1124 | t5=t3; | |
| 1125 | t6=t4; | |
| 1126 | for(i=2;i<ido;i+=2){ | |
| 1127 | t5+=2; | |
| 1128 | t6+=2; | |
| 1129 | ch[t5-1]=c1[t5-1]-c1[t6]; | |
| 1130 | ch[t6-1]=c1[t5-1]+c1[t6]; | |
| 1131 | ch[t5]=c1[t5]+c1[t6-1]; | |
| 1132 | ch[t6]=c1[t5]-c1[t6-1]; | |
| 1133 | } | |
| 1134 | t3+=ido; | |
| 1135 | t4+=ido; | |
| 1136 | } | |
| 1137 | } | |
| 1138 | state=132; | |
| 1139 | break; | |
| 1140 | case 128: | |
| 1141 | t1=0; | |
| 1142 | t2=ipp2*t0; | |
| 1143 | for(j=1;j<ipph;j++){ | |
| 1144 | t1+=t0; | |
| 1145 | t2-=t0; | |
| 1146 | t3=t1; | |
| 1147 | t4=t2; | |
| 1148 | for(i=2;i<ido;i+=2){ | |
| 1149 | t3+=2; | |
| 1150 | t4+=2; | |
| 1151 | t5=t3; | |
| 1152 | t6=t4; | |
| 1153 | for(k=0;k<l1;k++){ | |
| 1154 | ch[t5-1]=c1[t5-1]-c1[t6]; | |
| 1155 | ch[t6-1]=c1[t5-1]+c1[t6]; | |
| 1156 | ch[t5]=c1[t5]+c1[t6-1]; | |
| 1157 | ch[t6]=c1[t5]-c1[t6-1]; | |
| 1158 | t5+=ido; | |
| 1159 | t6+=ido; | |
| 1160 | } | |
| 1161 | } | |
| 1162 | } | |
| 1163 | case 132: | |
| 1164 | if(ido==1)return; | |
| 1165 | ||
| 1166 | for(ik=0;ik<idl1;ik++)c2[ik]=ch2[ik]; | |
| 1167 | ||
| 1168 | t1=0; | |
| 1169 | for(j=1;j<ip;j++){ | |
| 1170 | t2=(t1+=t0); | |
| 1171 | for(k=0;k<l1;k++){ | |
| 1172 | c1[t2]=ch[t2]; | |
| 1173 | t2+=ido; | |
| 1174 | } | |
| 1175 | } | |
| 1176 | ||
| 1177 | if(nbd>l1){ | |
| 1178 | state=139; | |
| 1179 | break; | |
| 1180 | } | |
| 1181 | ||
| 1182 | is= -ido-1; | |
| 1183 | t1=0; | |
| 1184 | for(j=1;j<ip;j++){ | |
| 1185 | is+=ido; | |
| 1186 | t1+=t0; | |
| 1187 | idij=is; | |
| 1188 | t2=t1; | |
| 1189 | for(i=2;i<ido;i+=2){ | |
| 1190 | t2+=2; | |
| 1191 | idij+=2; | |
| 1192 | t3=t2; | |
| 1193 | for(k=0;k<l1;k++){ | |
| 1194 | c1[t3-1]=wa[index+idij-1]*ch[t3-1]-wa[index+idij]*ch[t3]; | |
| 1195 | c1[t3]=wa[index+idij-1]*ch[t3]+wa[index+idij]*ch[t3-1]; | |
| 1196 | t3+=ido; | |
| 1197 | } | |
| 1198 | } | |
| 1199 | } | |
| 1200 | return; | |
| 1201 | ||
| 1202 | case 139: | |
| 1203 | is= -ido-1; | |
| 1204 | t1=0; | |
| 1205 | for(j=1;j<ip;j++){ | |
| 1206 | is+=ido; | |
| 1207 | t1+=t0; | |
| 1208 | t2=t1; | |
| 1209 | for(k=0;k<l1;k++){ | |
| 1210 | idij=is; | |
| 1211 | t3=t2; | |
| 1212 | for(i=2;i<ido;i+=2){ | |
| 1213 | idij+=2; | |
| 1214 | t3+=2; | |
| 1215 | c1[t3-1]=wa[index+idij-1]*ch[t3-1]-wa[index+idij]*ch[t3]; | |
| 1216 | c1[t3]=wa[index+idij-1]*ch[t3]+wa[index+idij]*ch[t3-1]; | |
| 1217 | } | |
| 1218 | t2+=ido; | |
| 1219 | } | |
| 1220 | } | |
| 1221 | break loop; | |
| 1222 | } | |
| 1223 | } | |
| 1224 | } | |
| 1225 | ||
| 1226 | static void drftb1(int n, float[] c, float[] ch, float[] wa, int index, int[] ifac){ | |
| 1227 | int i,k1,l1,l2=0; | |
| 1228 | int na; | |
| 1229 | int nf,ip=0,iw,ix2,ix3,ido=0,idl1=0; | |
| 1230 | ||
| 1231 | nf=ifac[1]; | |
| 1232 | na=0; | |
| 1233 | l1=1; | |
| 1234 | iw=1; | |
| 1235 | ||
| 1236 | for(k1=0;k1<nf;k1++){ | |
| 1237 | int state=100; | |
| 1238 | loop: while(true){ | |
| 1239 | switch(state){ | |
| 1240 | case 100: | |
| 1241 | ip=ifac[k1 + 2]; | |
| 1242 | l2=ip*l1; | |
| 1243 | ido=n/l2; | |
| 1244 | idl1=ido*l1; | |
| 1245 | if(ip!=4){ | |
| 1246 | state=103; | |
| 1247 | break; | |
| 1248 | } | |
| 1249 | ix2=iw+ido; | |
| 1250 | ix3=ix2+ido; | |
| 1251 | ||
| 1252 | if(na!=0) | |
| 1253 | dradb4(ido,l1,ch,c,wa,index+iw-1,wa,index+ix2-1,wa,index+ix3-1); | |
| 1254 | else | |
| 1255 | dradb4(ido,l1,c,ch,wa,index+iw-1,wa,index+ix2-1,wa,index+ix3-1); | |
| 1256 | na=1-na; | |
| 1257 | state=115; | |
| 1258 | break; | |
| 1259 | case 103: | |
| 1260 | if(ip!=2){ | |
| 1261 | state=106; | |
| 1262 | break; | |
| 1263 | } | |
| 1264 | ||
| 1265 | if(na!=0) | |
| 1266 | dradb2(ido,l1,ch,c,wa,index+iw-1); | |
| 1267 | else | |
| 1268 | dradb2(ido,l1,c,ch,wa,index+iw-1); | |
| 1269 | na=1-na; | |
| 1270 | state=115; | |
| 1271 | break; | |
| 1272 | ||
| 1273 | case 106: | |
| 1274 | if(ip!=3){ | |
| 1275 | state=109; | |
| 1276 | break; | |
| 1277 | } | |
| 1278 | ||
| 1279 | ix2=iw+ido; | |
| 1280 | if(na!=0) | |
| 1281 | dradb3(ido,l1,ch,c,wa,index+iw-1,wa,index+ix2-1); | |
| 1282 | else | |
| 1283 | dradb3(ido,l1,c,ch,wa,index+iw-1,wa,index+ix2-1); | |
| 1284 | na=1-na; | |
| 1285 | state=115; | |
| 1286 | break; | |
| 1287 | case 109: | |
| 1288 | // The radix five case can be translated later..... | |
| 1289 | // if(ip!=5)goto L112; | |
| 1290 | // | |
| 1291 | //ix2=iw+ido; | |
| 1292 | //ix3=ix2+ido; | |
| 1293 | //ix4=ix3+ido; | |
| 1294 | //if(na!=0) | |
| 1295 | // dradb5(ido,l1,ch,c,wa+iw-1,wa+ix2-1,wa+ix3-1,wa+ix4-1); | |
| 1296 | //else | |
| 1297 | // dradb5(ido,l1,c,ch,wa+iw-1,wa+ix2-1,wa+ix3-1,wa+ix4-1); | |
| 1298 | //na=1-na; | |
| 1299 | //state=115; | |
| 1300 | //break; | |
| 1301 | if(na!=0) | |
| 1302 | dradbg(ido,ip,l1,idl1,ch,ch,ch,c,c,wa,index+iw-1); | |
| 1303 | else | |
| 1304 | dradbg(ido,ip,l1,idl1,c,c,c,ch,ch,wa,index+iw-1); | |
| 1305 | if(ido==1)na=1-na; | |
| 1306 | ||
| 1307 | case 115: | |
| 1308 | l1=l2; | |
| 1309 | iw+=(ip-1)*ido; | |
| 1310 | break loop; | |
| 1311 | } | |
| 1312 | } | |
| 1313 | } | |
| 1314 | if(na==0)return; | |
| 1315 | for(i=0;i<n;i++)c[i]=ch[i]; | |
| 1316 | } | |
| 1317 | } |