/proc/self/cwd/libfaad/cfft.c

Line	Count	Source
1		/*
2		** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
3		** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
4		**
5		** This program is free software; you can redistribute it and/or modify
6		** it under the terms of the GNU General Public License as published by
7		** the Free Software Foundation; either version 2 of the License, or
8		** (at your option) any later version.
9		**
10		** This program is distributed in the hope that it will be useful,
11		** but WITHOUT ANY WARRANTY; without even the implied warranty of
12		** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13		** GNU General Public License for more details.
14		**
15		** You should have received a copy of the GNU General Public License
16		** along with this program; if not, write to the Free Software
17		** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18		**
19		** Any non-GPL usage of this software or parts of this software is strictly
20		** forbidden.
21		**
22		** The "appropriate copyright message" mentioned in section 2c of the GPLv2
23		** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
24		**
25		** Commercial non-GPL licensing of this software is possible.
26		** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
27		**
28		** $Id: cfft.c,v 1.35 2007/11/01 12:33:29 menno Exp $
29		**/
30
31		/*
32		* Algorithmically based on Fortran-77 FFTPACK
33		* by Paul N. Swarztrauber(Version 4, 1985).
34		*
35		* Does even sized fft only
36		*/
37
38		/* isign is +1 for backward and -1 for forward transforms */
39
40		#include "common.h"
41		#include "structs.h"
42
43		#include <stdlib.h>
44
45		#include "cfft.h"
46		#include "cfft_tab.h"
47
48
49		/* static function declarations */
50		static void passf2pos(const uint16_t ido, const uint16_t l1, const complex_t *cc,
51		complex_t ch, const complex_t wa);
52		static void passf2neg(const uint16_t ido, const uint16_t l1, const complex_t *cc,
53		complex_t ch, const complex_t wa);
54		static void passf3(const uint16_t ido, const uint16_t l1, const complex_t *cc,
55		complex_t ch, const complex_t wa1, const complex_t *wa2, const int8_t isign);
56		static void passf4pos(const uint16_t ido, const uint16_t l1, const complex_t cc, complex_t ch,
57		const complex_t wa1, const complex_t wa2, const complex_t *wa3);
58		static void passf4neg(const uint16_t ido, const uint16_t l1, const complex_t cc, complex_t ch,
59		const complex_t wa1, const complex_t wa2, const complex_t *wa3);
60		static void passf5(const uint16_t ido, const uint16_t l1, const complex_t cc, complex_t ch,
61		const complex_t wa1, const complex_t wa2, const complex_t *wa3,
62		const complex_t *wa4, const int8_t isign);
63		static void cffti1(uint16_t n, complex_t wa, uint16_t ifac);
64
65
66		/*----------------------------------------------------------------------
67		passf2, passf3, passf4, passf5. Complex FFT passes fwd and bwd.
68		----------------------------------------------------------------------*/
69
70		static void passf2pos(const uint16_t ido, const uint16_t l1, const complex_t *cc,
71		complex_t ch, const complex_t wa)
72	150k	{
73	150k	uint16_t i, k, ah, ac;
74
75	150k	if (ido == 1)
76	0	{
77	0	#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
78		// TODO: remove this code once fuzzer proves it is totally unreahable
79		// For supported frame lengths that have odd number of factor 2 it is
80		// never the last factor; consequently `ido` should never be 1.
81	0	__builtin_trap();
82		/*
83		#endif
84		for (k = 0; k < l1; k++)
85		{
86		ah = 2*k;
87		ac = 4*k;
88
89		RE(ch[ah]) = RE(cc[ac]) + RE(cc[ac+1]);
90		RE(ch[ah+l1]) = RE(cc[ac]) - RE(cc[ac+1]);
91		IM(ch[ah]) = IM(cc[ac]) + IM(cc[ac+1]);
92		IM(ch[ah+l1]) = IM(cc[ac]) - IM(cc[ac+1]);
93		}
94		#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
95		*/
96	0	#endif
97	150k	} else {
98	301k	for (k = 0; k < l1; k++)
99	150k	{
100	150k	ah = k*ido;
101	150k	ac = 2kido;
102
103	38.4M	for (i = 0; i < ido; i++)
104	38.2M	{
105	38.2M	complex_t t2;
106
107	38.2M	RE(ch[ah+i]) = RE(cc[ac+i]) + RE(cc[ac+i+ido]);
108	38.2M	RE(t2) = RE(cc[ac+i]) - RE(cc[ac+i+ido]);
109
110	38.2M	IM(ch[ah+i]) = IM(cc[ac+i]) + IM(cc[ac+i+ido]);
111	38.2M	IM(t2) = IM(cc[ac+i]) - IM(cc[ac+i+ido]);
112
113	38.2M	#if 1
114	38.2M	ComplexMult(&IM(ch[ah+i+l1ido]), &RE(ch[ah+i+l1ido]),
115	38.2M	IM(t2), RE(t2), RE(wa[i]), IM(wa[i]));
116		#else
117		ComplexMult(&RE(ch[ah+i+l1ido]), &IM(ch[ah+i+l1ido]),
118		RE(t2), IM(t2), RE(wa[i]), IM(wa[i]));
119		#endif
120	38.2M	}
121	150k	}
122	150k	}
123	150k	}
124
125		static void passf2neg(const uint16_t ido, const uint16_t l1, const complex_t *cc,
126		complex_t ch, const complex_t wa)
127	5.23k	{
128	5.23k	uint16_t i, k, ah, ac;
129
130	5.23k	if (ido == 1)
131	0	{
132	0	#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
133		// TODO: remove this code once fuzzer proves it is totally unreahable
134		// For supported frame lengths that have odd number of factor 2 it is
135		// never the last factor; consequently `ido` should never be 1.
136	0	__builtin_trap();
137		/*
138		#endif
139		for (k = 0; k < l1; k++)
140		{
141		ah = 2*k;
142		ac = 4*k;
143
144		RE(ch[ah]) = RE(cc[ac]) + RE(cc[ac+1]);
145		RE(ch[ah+l1]) = RE(cc[ac]) - RE(cc[ac+1]);
146		IM(ch[ah]) = IM(cc[ac]) + IM(cc[ac+1]);
147		IM(ch[ah+l1]) = IM(cc[ac]) - IM(cc[ac+1]);
148		}
149		#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
150		*/
151	0	#endif
152	5.23k	} else {
153	10.4k	for (k = 0; k < l1; k++)
154	5.23k	{
155	5.23k	ah = k*ido;
156	5.23k	ac = 2kido;
157
158	1.29M	for (i = 0; i < ido; i++)
159	1.29M	{
160	1.29M	complex_t t2;
161
162	1.29M	RE(ch[ah+i]) = RE(cc[ac+i]) + RE(cc[ac+i+ido]);
163	1.29M	RE(t2) = RE(cc[ac+i]) - RE(cc[ac+i+ido]);
164
165	1.29M	IM(ch[ah+i]) = IM(cc[ac+i]) + IM(cc[ac+i+ido]);
166	1.29M	IM(t2) = IM(cc[ac+i]) - IM(cc[ac+i+ido]);
167
168	1.29M	#if 1
169	1.29M	ComplexMult(&RE(ch[ah+i+l1ido]), &IM(ch[ah+i+l1ido]),
170	1.29M	RE(t2), IM(t2), RE(wa[i]), IM(wa[i]));
171		#else
172		ComplexMult(&IM(ch[ah+i+l1ido]), &RE(ch[ah+i+l1ido]),
173		IM(t2), RE(t2), RE(wa[i]), IM(wa[i]));
174		#endif
175	1.29M	}
176	5.23k	}
177	5.23k	}
178	5.23k	}
179
180
181		static void passf3(const uint16_t ido, const uint16_t l1, const complex_t *cc,
182		complex_t ch, const complex_t wa1, const complex_t *wa2,
183		const int8_t isign)
184	49.5k	{
185	49.5k	static real_t taur = FRAC_CONST(-0.5);
186	49.5k	static real_t taui = FRAC_CONST(0.866025403784439);
187	49.5k	uint16_t i, k, ac, ah;
188	49.5k	complex_t c2, c3, d2, d3, t2;
189
190	49.5k	if (ido == 1)
191	0	{
192	0	#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
193		// TODO: remove this code once fuzzer proves it is totally unreahable
194		// 3 is never the the biggest factor for supported frame lengths;
195		// consequently `ido` should never be 1.
196	0	__builtin_trap();
197		/*
198		#endif
199		if (isign == 1)
200		{
201		for (k = 0; k < l1; k++)
202		{
203		ac = 3*k+1;
204		ah = k;
205
206		RE(t2) = RE(cc[ac]) + RE(cc[ac+1]);
207		IM(t2) = IM(cc[ac]) + IM(cc[ac+1]);
208		RE(c2) = RE(cc[ac-1]) + MUL_F(RE(t2),taur);
209		IM(c2) = IM(cc[ac-1]) + MUL_F(IM(t2),taur);
210
211		RE(ch[ah]) = RE(cc[ac-1]) + RE(t2);
212		IM(ch[ah]) = IM(cc[ac-1]) + IM(t2);
213
214		RE(c3) = MUL_F((RE(cc[ac]) - RE(cc[ac+1])), taui);
215		IM(c3) = MUL_F((IM(cc[ac]) - IM(cc[ac+1])), taui);
216
217		RE(ch[ah+l1]) = RE(c2) - IM(c3);
218		IM(ch[ah+l1]) = IM(c2) + RE(c3);
219		RE(ch[ah+2*l1]) = RE(c2) + IM(c3);
220		IM(ch[ah+2*l1]) = IM(c2) - RE(c3);
221		}
222		} else {
223		for (k = 0; k < l1; k++)
224		{
225		ac = 3*k+1;
226		ah = k;
227
228		RE(t2) = RE(cc[ac]) + RE(cc[ac+1]);
229		IM(t2) = IM(cc[ac]) + IM(cc[ac+1]);
230		RE(c2) = RE(cc[ac-1]) + MUL_F(RE(t2),taur);
231		IM(c2) = IM(cc[ac-1]) + MUL_F(IM(t2),taur);
232
233		RE(ch[ah]) = RE(cc[ac-1]) + RE(t2);
234		IM(ch[ah]) = IM(cc[ac-1]) + IM(t2);
235
236		RE(c3) = MUL_F((RE(cc[ac]) - RE(cc[ac+1])), taui);
237		IM(c3) = MUL_F((IM(cc[ac]) - IM(cc[ac+1])), taui);
238
239		RE(ch[ah+l1]) = RE(c2) + IM(c3);
240		IM(ch[ah+l1]) = IM(c2) - RE(c3);
241		RE(ch[ah+2*l1]) = RE(c2) - IM(c3);
242		IM(ch[ah+2*l1]) = IM(c2) + RE(c3);
243		}
244		}
245		#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
246		*/
247	0	#endif
248	49.5k	} else {
249	49.5k	if (isign == 1)
250	46.3k	{
251	114k	for (k = 0; k < l1; k++)
252	68.3k	{
253	4.13M	for (i = 0; i < ido; i++)
254	4.07M	{
255	4.07M	ac = i + (3k+1)ido;
256	4.07M	ah = i + k * ido;
257
258	4.07M	RE(t2) = RE(cc[ac]) + RE(cc[ac+ido]);
259	4.07M	RE(c2) = RE(cc[ac-ido]) + MUL_F(RE(t2),taur);
260	4.07M	IM(t2) = IM(cc[ac]) + IM(cc[ac+ido]);
261	4.07M	IM(c2) = IM(cc[ac-ido]) + MUL_F(IM(t2),taur);
262
263	4.07M	RE(ch[ah]) = RE(cc[ac-ido]) + RE(t2);
264	4.07M	IM(ch[ah]) = IM(cc[ac-ido]) + IM(t2);
265
266	4.07M	RE(c3) = MUL_F((RE(cc[ac]) - RE(cc[ac+ido])), taui);
267	4.07M	IM(c3) = MUL_F((IM(cc[ac]) - IM(cc[ac+ido])), taui);
268
269	4.07M	RE(d2) = RE(c2) - IM(c3);
270	4.07M	IM(d3) = IM(c2) - RE(c3);
271	4.07M	RE(d3) = RE(c2) + IM(c3);
272	4.07M	IM(d2) = IM(c2) + RE(c3);
273
274	4.07M	#if 1
275	4.07M	ComplexMult(&IM(ch[ah+l1ido]), &RE(ch[ah+l1ido]),
276	4.07M	IM(d2), RE(d2), RE(wa1[i]), IM(wa1[i]));
277	4.07M	ComplexMult(&IM(ch[ah+2l1ido]), &RE(ch[ah+2l1ido]),
278	4.07M	IM(d3), RE(d3), RE(wa2[i]), IM(wa2[i]));
279		#else
280		ComplexMult(&RE(ch[ah+l1ido]), &IM(ch[ah+l1ido]),
281		RE(d2), IM(d2), RE(wa1[i]), IM(wa1[i]));
282		ComplexMult(&RE(ch[ah+2l1ido]), &IM(ch[ah+2l1ido]),
283		RE(d3), IM(d3), RE(wa2[i]), IM(wa2[i]));
284		#endif
285	4.07M	}
286	68.3k	}
287	46.3k	} else {
288	9.46k	for (k = 0; k < l1; k++)
289	6.28k	{
290	509k	for (i = 0; i < ido; i++)
291	502k	{
292	502k	ac = i + (3k+1)ido;
293	502k	ah = i + k * ido;
294
295	502k	RE(t2) = RE(cc[ac]) + RE(cc[ac+ido]);
296	502k	RE(c2) = RE(cc[ac-ido]) + MUL_F(RE(t2),taur);
297	502k	IM(t2) = IM(cc[ac]) + IM(cc[ac+ido]);
298	502k	IM(c2) = IM(cc[ac-ido]) + MUL_F(IM(t2),taur);
299
300	502k	RE(ch[ah]) = RE(cc[ac-ido]) + RE(t2);
301	502k	IM(ch[ah]) = IM(cc[ac-ido]) + IM(t2);
302
303	502k	RE(c3) = MUL_F((RE(cc[ac]) - RE(cc[ac+ido])), taui);
304	502k	IM(c3) = MUL_F((IM(cc[ac]) - IM(cc[ac+ido])), taui);
305
306	502k	RE(d2) = RE(c2) + IM(c3);
307	502k	IM(d3) = IM(c2) + RE(c3);
308	502k	RE(d3) = RE(c2) - IM(c3);
309	502k	IM(d2) = IM(c2) - RE(c3);
310
311	502k	#if 1
312	502k	ComplexMult(&RE(ch[ah+l1ido]), &IM(ch[ah+l1ido]),
313	502k	RE(d2), IM(d2), RE(wa1[i]), IM(wa1[i]));
314	502k	ComplexMult(&RE(ch[ah+2l1ido]), &IM(ch[ah+2l1ido]),
315	502k	RE(d3), IM(d3), RE(wa2[i]), IM(wa2[i]));
316		#else
317		ComplexMult(&IM(ch[ah+l1ido]), &RE(ch[ah+l1ido]),
318		IM(d2), RE(d2), RE(wa1[i]), IM(wa1[i]));
319		ComplexMult(&IM(ch[ah+2l1ido]), &RE(ch[ah+2l1ido]),
320		IM(d3), RE(d3), RE(wa2[i]), IM(wa2[i]));
321		#endif
322	502k	}
323	6.28k	}
324	3.18k	}
325	49.5k	}
326	49.5k	}
327
328
329		static void passf4pos(const uint16_t ido, const uint16_t l1, const complex_t *cc,
330		complex_t ch, const complex_t wa1, const complex_t *wa2,
331		const complex_t *wa3)
332	813k	{
333	813k	uint16_t i, k, ac, ah;
334
335	813k	if (ido == 1)
336	204k	{
337	17.9M	for (k = 0; k < l1; k++)
338	17.7M	{
339	17.7M	complex_t t1, t2, t3, t4;
340
341	17.7M	ac = 4*k;
342	17.7M	ah = k;
343
344	17.7M	RE(t2) = RE(cc[ac]) + RE(cc[ac+2]);
345	17.7M	RE(t1) = RE(cc[ac]) - RE(cc[ac+2]);
346	17.7M	IM(t2) = IM(cc[ac]) + IM(cc[ac+2]);
347	17.7M	IM(t1) = IM(cc[ac]) - IM(cc[ac+2]);
348	17.7M	RE(t3) = RE(cc[ac+1]) + RE(cc[ac+3]);
349	17.7M	IM(t4) = RE(cc[ac+1]) - RE(cc[ac+3]);
350	17.7M	IM(t3) = IM(cc[ac+3]) + IM(cc[ac+1]);
351	17.7M	RE(t4) = IM(cc[ac+3]) - IM(cc[ac+1]);
352
353	17.7M	RE(ch[ah]) = RE(t2) + RE(t3);
354	17.7M	RE(ch[ah+2*l1]) = RE(t2) - RE(t3);
355
356	17.7M	IM(ch[ah]) = IM(t2) + IM(t3);
357	17.7M	IM(ch[ah+2*l1]) = IM(t2) - IM(t3);
358
359	17.7M	RE(ch[ah+l1]) = RE(t1) + RE(t4);
360	17.7M	RE(ch[ah+3*l1]) = RE(t1) - RE(t4);
361
362	17.7M	IM(ch[ah+l1]) = IM(t1) + IM(t4);
363	17.7M	IM(ch[ah+3*l1]) = IM(t1) - IM(t4);
364	17.7M	}
365	608k	} else {
366	7.15M	for (k = 0; k < l1; k++)
367	6.54M	{
368	6.54M	ac = 4kido;
369	6.54M	ah = k*ido;
370
371	64.2M	for (i = 0; i < ido; i++)
372	57.7M	{
373	57.7M	complex_t c2, c3, c4, t1, t2, t3, t4;
374
375	57.7M	RE(t2) = RE(cc[ac+i]) + RE(cc[ac+i+2*ido]);
376	57.7M	RE(t1) = RE(cc[ac+i]) - RE(cc[ac+i+2*ido]);
377	57.7M	IM(t2) = IM(cc[ac+i]) + IM(cc[ac+i+2*ido]);
378	57.7M	IM(t1) = IM(cc[ac+i]) - IM(cc[ac+i+2*ido]);
379	57.7M	RE(t3) = RE(cc[ac+i+ido]) + RE(cc[ac+i+3*ido]);
380	57.7M	IM(t4) = RE(cc[ac+i+ido]) - RE(cc[ac+i+3*ido]);
381	57.7M	IM(t3) = IM(cc[ac+i+3*ido]) + IM(cc[ac+i+ido]);
382	57.7M	RE(t4) = IM(cc[ac+i+3*ido]) - IM(cc[ac+i+ido]);
383
384	57.7M	RE(c2) = RE(t1) + RE(t4);
385	57.7M	RE(c4) = RE(t1) - RE(t4);
386
387	57.7M	IM(c2) = IM(t1) + IM(t4);
388	57.7M	IM(c4) = IM(t1) - IM(t4);
389
390	57.7M	RE(ch[ah+i]) = RE(t2) + RE(t3);
391	57.7M	RE(c3) = RE(t2) - RE(t3);
392
393	57.7M	IM(ch[ah+i]) = IM(t2) + IM(t3);
394	57.7M	IM(c3) = IM(t2) - IM(t3);
395
396	57.7M	#if 1
397	57.7M	ComplexMult(&IM(ch[ah+i+l1ido]), &RE(ch[ah+i+l1ido]),
398	57.7M	IM(c2), RE(c2), RE(wa1[i]), IM(wa1[i]));
399	57.7M	ComplexMult(&IM(ch[ah+i+2l1ido]), &RE(ch[ah+i+2l1ido]),
400	57.7M	IM(c3), RE(c3), RE(wa2[i]), IM(wa2[i]));
401	57.7M	ComplexMult(&IM(ch[ah+i+3l1ido]), &RE(ch[ah+i+3l1ido]),
402	57.7M	IM(c4), RE(c4), RE(wa3[i]), IM(wa3[i]));
403		#else
404		ComplexMult(&RE(ch[ah+i+l1ido]), &IM(ch[ah+i+l1ido]),
405		RE(c2), IM(c2), RE(wa1[i]), IM(wa1[i]));
406		ComplexMult(&RE(ch[ah+i+2l1ido]), &IM(ch[ah+i+2l1ido]),
407		RE(c3), IM(c3), RE(wa2[i]), IM(wa2[i]));
408		ComplexMult(&RE(ch[ah+i+3l1ido]), &IM(ch[ah+i+3l1ido]),
409		RE(c4), IM(c4), RE(wa3[i]), IM(wa3[i]));
410		#endif
411	57.7M	}
412	6.54M	}
413	608k	}
414	813k	}
415
416		static void passf4neg(const uint16_t ido, const uint16_t l1, const complex_t *cc,
417		complex_t ch, const complex_t wa1, const complex_t *wa2,
418		const complex_t *wa3)
419	15.2k	{
420	15.2k	uint16_t i, k, ac, ah;
421
422	15.2k	if (ido == 1)
423	2.23k	{
424	281k	for (k = 0; k < l1; k++)
425	279k	{
426	279k	complex_t t1, t2, t3, t4;
427
428	279k	ac = 4*k;
429	279k	ah = k;
430
431	279k	RE(t2) = RE(cc[ac]) + RE(cc[ac+2]);
432	279k	RE(t1) = RE(cc[ac]) - RE(cc[ac+2]);
433	279k	IM(t2) = IM(cc[ac]) + IM(cc[ac+2]);
434	279k	IM(t1) = IM(cc[ac]) - IM(cc[ac+2]);
435	279k	RE(t3) = RE(cc[ac+1]) + RE(cc[ac+3]);
436	279k	IM(t4) = RE(cc[ac+1]) - RE(cc[ac+3]);
437	279k	IM(t3) = IM(cc[ac+3]) + IM(cc[ac+1]);
438	279k	RE(t4) = IM(cc[ac+3]) - IM(cc[ac+1]);
439
440	279k	RE(ch[ah]) = RE(t2) + RE(t3);
441	279k	RE(ch[ah+2*l1]) = RE(t2) - RE(t3);
442
443	279k	IM(ch[ah]) = IM(t2) + IM(t3);
444	279k	IM(ch[ah+2*l1]) = IM(t2) - IM(t3);
445
446	279k	RE(ch[ah+l1]) = RE(t1) - RE(t4);
447	279k	RE(ch[ah+3*l1]) = RE(t1) + RE(t4);
448
449	279k	IM(ch[ah+l1]) = IM(t1) - IM(t4);
450	279k	IM(ch[ah+3*l1]) = IM(t1) + IM(t4);
451	279k	}
452	13.0k	} else {
453	198k	for (k = 0; k < l1; k++)
454	185k	{
455	185k	ac = 4kido;
456	185k	ah = k*ido;
457
458	1.77M	for (i = 0; i < ido; i++)
459	1.59M	{
460	1.59M	complex_t c2, c3, c4, t1, t2, t3, t4;
461
462	1.59M	RE(t2) = RE(cc[ac+i]) + RE(cc[ac+i+2*ido]);
463	1.59M	RE(t1) = RE(cc[ac+i]) - RE(cc[ac+i+2*ido]);
464	1.59M	IM(t2) = IM(cc[ac+i]) + IM(cc[ac+i+2*ido]);
465	1.59M	IM(t1) = IM(cc[ac+i]) - IM(cc[ac+i+2*ido]);
466	1.59M	RE(t3) = RE(cc[ac+i+ido]) + RE(cc[ac+i+3*ido]);
467	1.59M	IM(t4) = RE(cc[ac+i+ido]) - RE(cc[ac+i+3*ido]);
468	1.59M	IM(t3) = IM(cc[ac+i+3*ido]) + IM(cc[ac+i+ido]);
469	1.59M	RE(t4) = IM(cc[ac+i+3*ido]) - IM(cc[ac+i+ido]);
470
471	1.59M	RE(c2) = RE(t1) - RE(t4);
472	1.59M	RE(c4) = RE(t1) + RE(t4);
473
474	1.59M	IM(c2) = IM(t1) - IM(t4);
475	1.59M	IM(c4) = IM(t1) + IM(t4);
476
477	1.59M	RE(ch[ah+i]) = RE(t2) + RE(t3);
478	1.59M	RE(c3) = RE(t2) - RE(t3);
479
480	1.59M	IM(ch[ah+i]) = IM(t2) + IM(t3);
481	1.59M	IM(c3) = IM(t2) - IM(t3);
482
483	1.59M	#if 1
484	1.59M	ComplexMult(&RE(ch[ah+i+l1ido]), &IM(ch[ah+i+l1ido]),
485	1.59M	RE(c2), IM(c2), RE(wa1[i]), IM(wa1[i]));
486	1.59M	ComplexMult(&RE(ch[ah+i+2l1ido]), &IM(ch[ah+i+2l1ido]),
487	1.59M	RE(c3), IM(c3), RE(wa2[i]), IM(wa2[i]));
488	1.59M	ComplexMult(&RE(ch[ah+i+3l1ido]), &IM(ch[ah+i+3l1ido]),
489	1.59M	RE(c4), IM(c4), RE(wa3[i]), IM(wa3[i]));
490		#else
491		ComplexMult(&IM(ch[ah+i+l1ido]), &RE(ch[ah+i+l1ido]),
492		IM(c2), RE(c2), RE(wa1[i]), IM(wa1[i]));
493		ComplexMult(&IM(ch[ah+i+2l1ido]), &RE(ch[ah+i+2l1ido]),
494		IM(c3), RE(c3), RE(wa2[i]), IM(wa2[i]));
495		ComplexMult(&IM(ch[ah+i+3l1ido]), &RE(ch[ah+i+3l1ido]),
496		IM(c4), RE(c4), RE(wa3[i]), IM(wa3[i]));
497		#endif
498	1.59M	}
499	185k	}
500	13.0k	}
501	15.2k	}
502
503		static void passf5(const uint16_t ido, const uint16_t l1, const complex_t *cc,
504		complex_t ch, const complex_t wa1, const complex_t wa2, const complex_t wa3,
505		const complex_t *wa4, const int8_t isign)
506	49.5k	{
507	49.5k	static real_t tr11 = FRAC_CONST(0.309016994374947);
508	49.5k	static real_t ti11 = FRAC_CONST(0.951056516295154);
509	49.5k	static real_t tr12 = FRAC_CONST(-0.809016994374947);
510	49.5k	static real_t ti12 = FRAC_CONST(0.587785252292473);
511	49.5k	uint16_t k, ac, ah;
512	49.5k	complex_t c2, c3, c4, c5, t2, t3, t4, t5;
513	49.5k	(void)wa1;
514	49.5k	(void)wa2;
515	49.5k	(void)wa3;
516	49.5k	(void)wa4;
517
518	49.5k	if (ido == 1)
519	49.5k	{
520	49.5k	if (isign == 1)
521	46.3k	{
522	2.48M	for (k = 0; k < l1; k++)
523	2.44M	{
524	2.44M	ac = 5*k + 1;
525	2.44M	ah = k;
526
527	2.44M	RE(t2) = RE(cc[ac]) + RE(cc[ac+3]);
528	2.44M	IM(t2) = IM(cc[ac]) + IM(cc[ac+3]);
529	2.44M	RE(t3) = RE(cc[ac+1]) + RE(cc[ac+2]);
530	2.44M	IM(t3) = IM(cc[ac+1]) + IM(cc[ac+2]);
531	2.44M	RE(t4) = RE(cc[ac+1]) - RE(cc[ac+2]);
532	2.44M	IM(t4) = IM(cc[ac+1]) - IM(cc[ac+2]);
533	2.44M	RE(t5) = RE(cc[ac]) - RE(cc[ac+3]);
534	2.44M	IM(t5) = IM(cc[ac]) - IM(cc[ac+3]);
535
536	2.44M	RE(ch[ah]) = RE(cc[ac-1]) + RE(t2) + RE(t3);
537	2.44M	IM(ch[ah]) = IM(cc[ac-1]) + IM(t2) + IM(t3);
538
539	2.44M	RE(c2) = RE(cc[ac-1]) + MUL_F(RE(t2),tr11) + MUL_F(RE(t3),tr12);
540	2.44M	IM(c2) = IM(cc[ac-1]) + MUL_F(IM(t2),tr11) + MUL_F(IM(t3),tr12);
541	2.44M	RE(c3) = RE(cc[ac-1]) + MUL_F(RE(t2),tr12) + MUL_F(RE(t3),tr11);
542	2.44M	IM(c3) = IM(cc[ac-1]) + MUL_F(IM(t2),tr12) + MUL_F(IM(t3),tr11);
543
544	2.44M	ComplexMult(&RE(c5), &RE(c4),
545	2.44M	ti11, ti12, RE(t5), RE(t4));
546	2.44M	ComplexMult(&IM(c5), &IM(c4),
547	2.44M	ti11, ti12, IM(t5), IM(t4));
548
549	2.44M	RE(ch[ah+l1]) = RE(c2) - IM(c5);
550	2.44M	IM(ch[ah+l1]) = IM(c2) + RE(c5);
551	2.44M	RE(ch[ah+2*l1]) = RE(c3) - IM(c4);
552	2.44M	IM(ch[ah+2*l1]) = IM(c3) + RE(c4);
553	2.44M	RE(ch[ah+3*l1]) = RE(c3) + IM(c4);
554	2.44M	IM(ch[ah+3*l1]) = IM(c3) - RE(c4);
555	2.44M	RE(ch[ah+4*l1]) = RE(c2) + IM(c5);
556	2.44M	IM(ch[ah+4*l1]) = IM(c2) - RE(c5);
557	2.44M	}
558	46.3k	} else {
559	304k	for (k = 0; k < l1; k++)
560	301k	{
561	301k	ac = 5*k + 1;
562	301k	ah = k;
563
564	301k	RE(t2) = RE(cc[ac]) + RE(cc[ac+3]);
565	301k	IM(t2) = IM(cc[ac]) + IM(cc[ac+3]);
566	301k	RE(t3) = RE(cc[ac+1]) + RE(cc[ac+2]);
567	301k	IM(t3) = IM(cc[ac+1]) + IM(cc[ac+2]);
568	301k	RE(t4) = RE(cc[ac+1]) - RE(cc[ac+2]);
569	301k	IM(t4) = IM(cc[ac+1]) - IM(cc[ac+2]);
570	301k	RE(t5) = RE(cc[ac]) - RE(cc[ac+3]);
571	301k	IM(t5) = IM(cc[ac]) - IM(cc[ac+3]);
572
573	301k	RE(ch[ah]) = RE(cc[ac-1]) + RE(t2) + RE(t3);
574	301k	IM(ch[ah]) = IM(cc[ac-1]) + IM(t2) + IM(t3);
575
576	301k	RE(c2) = RE(cc[ac-1]) + MUL_F(RE(t2),tr11) + MUL_F(RE(t3),tr12);
577	301k	IM(c2) = IM(cc[ac-1]) + MUL_F(IM(t2),tr11) + MUL_F(IM(t3),tr12);
578	301k	RE(c3) = RE(cc[ac-1]) + MUL_F(RE(t2),tr12) + MUL_F(RE(t3),tr11);
579	301k	IM(c3) = IM(cc[ac-1]) + MUL_F(IM(t2),tr12) + MUL_F(IM(t3),tr11);
580
581	301k	ComplexMult(&RE(c4), &RE(c5),
582	301k	ti12, ti11, RE(t5), RE(t4));
583	301k	ComplexMult(&IM(c4), &IM(c5),
584	301k	ti12, ti11, IM(t5), IM(t4));
585
586	301k	RE(ch[ah+l1]) = RE(c2) + IM(c5);
587	301k	IM(ch[ah+l1]) = IM(c2) - RE(c5);
588	301k	RE(ch[ah+2*l1]) = RE(c3) + IM(c4);
589	301k	IM(ch[ah+2*l1]) = IM(c3) - RE(c4);
590	301k	RE(ch[ah+3*l1]) = RE(c3) - IM(c4);
591	301k	IM(ch[ah+3*l1]) = IM(c3) + RE(c4);
592	301k	RE(ch[ah+4*l1]) = RE(c2) - IM(c5);
593	301k	IM(ch[ah+4*l1]) = IM(c2) + RE(c5);
594	301k	}
595	3.18k	}
596	49.5k	} else {
597	0	#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
598		// TODO: remove this code once fuzzer proves it is totally unreahable
599		// 5 if the biggest factor and it never repeated for supported frame
600		// lengths; consequently `ido` should always be 1.
601	0	__builtin_trap();
602		/*
603		#else
604		uint16_t i;
605		complex_t d3, d4, d5, d2;
606		#endif
607		if (isign == 1)
608		{
609		for (k = 0; k < l1; k++)
610		{
611		for (i = 0; i < ido; i++)
612		{
613		ac = i + (k5 + 1) ido;
614		ah = i + k * ido;
615
616		RE(t2) = RE(cc[ac]) + RE(cc[ac+3*ido]);
617		IM(t2) = IM(cc[ac]) + IM(cc[ac+3*ido]);
618		RE(t3) = RE(cc[ac+ido]) + RE(cc[ac+2*ido]);
619		IM(t3) = IM(cc[ac+ido]) + IM(cc[ac+2*ido]);
620		RE(t4) = RE(cc[ac+ido]) - RE(cc[ac+2*ido]);
621		IM(t4) = IM(cc[ac+ido]) - IM(cc[ac+2*ido]);
622		RE(t5) = RE(cc[ac]) - RE(cc[ac+3*ido]);
623		IM(t5) = IM(cc[ac]) - IM(cc[ac+3*ido]);
624
625		RE(ch[ah]) = RE(cc[ac-ido]) + RE(t2) + RE(t3);
626		IM(ch[ah]) = IM(cc[ac-ido]) + IM(t2) + IM(t3);
627
628		RE(c2) = RE(cc[ac-ido]) + MUL_F(RE(t2),tr11) + MUL_F(RE(t3),tr12);
629		IM(c2) = IM(cc[ac-ido]) + MUL_F(IM(t2),tr11) + MUL_F(IM(t3),tr12);
630		RE(c3) = RE(cc[ac-ido]) + MUL_F(RE(t2),tr12) + MUL_F(RE(t3),tr11);
631		IM(c3) = IM(cc[ac-ido]) + MUL_F(IM(t2),tr12) + MUL_F(IM(t3),tr11);
632
633		ComplexMult(&RE(c5), &RE(c4),
634		ti11, ti12, RE(t5), RE(t4));
635		ComplexMult(&IM(c5), &IM(c4),
636		ti11, ti12, IM(t5), IM(t4));
637
638		IM(d2) = IM(c2) + RE(c5);
639		IM(d3) = IM(c3) + RE(c4);
640		RE(d4) = RE(c3) + IM(c4);
641		RE(d5) = RE(c2) + IM(c5);
642		RE(d2) = RE(c2) - IM(c5);
643		IM(d5) = IM(c2) - RE(c5);
644		RE(d3) = RE(c3) - IM(c4);
645		IM(d4) = IM(c3) - RE(c4);
646
647		#if 1
648		ComplexMult(&IM(ch[ah+l1ido]), &RE(ch[ah+l1ido]),
649		IM(d2), RE(d2), RE(wa1[i]), IM(wa1[i]));
650		ComplexMult(&IM(ch[ah+2l1ido]), &RE(ch[ah+2l1ido]),
651		IM(d3), RE(d3), RE(wa2[i]), IM(wa2[i]));
652		ComplexMult(&IM(ch[ah+3l1ido]), &RE(ch[ah+3l1ido]),
653		IM(d4), RE(d4), RE(wa3[i]), IM(wa3[i]));
654		ComplexMult(&IM(ch[ah+4l1ido]), &RE(ch[ah+4l1ido]),
655		IM(d5), RE(d5), RE(wa4[i]), IM(wa4[i]));
656		#else
657		ComplexMult(&RE(ch[ah+l1ido]), &IM(ch[ah+l1ido]),
658		RE(d2), IM(d2), RE(wa1[i]), IM(wa1[i]));
659		ComplexMult(&RE(ch[ah+2l1ido]), &IM(ch[ah+2l1ido]),
660		RE(d3), IM(d3), RE(wa2[i]), IM(wa2[i]));
661		ComplexMult(&RE(ch[ah+3l1ido]), &IM(ch[ah+3l1ido]),
662		RE(d4), IM(d4), RE(wa3[i]), IM(wa3[i]));
663		ComplexMult(&RE(ch[ah+4l1ido]), &IM(ch[ah+4l1ido]),
664		RE(d5), IM(d5), RE(wa4[i]), IM(wa4[i]));
665		#endif
666		}
667		}
668		} else {
669		for (k = 0; k < l1; k++)
670		{
671		for (i = 0; i < ido; i++)
672		{
673		ac = i + (k5 + 1) ido;
674		ah = i + k * ido;
675
676		RE(t2) = RE(cc[ac]) + RE(cc[ac+3*ido]);
677		IM(t2) = IM(cc[ac]) + IM(cc[ac+3*ido]);
678		RE(t3) = RE(cc[ac+ido]) + RE(cc[ac+2*ido]);
679		IM(t3) = IM(cc[ac+ido]) + IM(cc[ac+2*ido]);
680		RE(t4) = RE(cc[ac+ido]) - RE(cc[ac+2*ido]);
681		IM(t4) = IM(cc[ac+ido]) - IM(cc[ac+2*ido]);
682		RE(t5) = RE(cc[ac]) - RE(cc[ac+3*ido]);
683		IM(t5) = IM(cc[ac]) - IM(cc[ac+3*ido]);
684
685		RE(ch[ah]) = RE(cc[ac-ido]) + RE(t2) + RE(t3);
686		IM(ch[ah]) = IM(cc[ac-ido]) + IM(t2) + IM(t3);
687
688		RE(c2) = RE(cc[ac-ido]) + MUL_F(RE(t2),tr11) + MUL_F(RE(t3),tr12);
689		IM(c2) = IM(cc[ac-ido]) + MUL_F(IM(t2),tr11) + MUL_F(IM(t3),tr12);
690		RE(c3) = RE(cc[ac-ido]) + MUL_F(RE(t2),tr12) + MUL_F(RE(t3),tr11);
691		IM(c3) = IM(cc[ac-ido]) + MUL_F(IM(t2),tr12) + MUL_F(IM(t3),tr11);
692
693		ComplexMult(&RE(c4), &RE(c5),
694		ti12, ti11, RE(t5), RE(t4));
695		ComplexMult(&IM(c4), &IM(c5),
696		ti12, ti11, IM(t5), IM(t4));
697
698		IM(d2) = IM(c2) - RE(c5);
699		IM(d3) = IM(c3) - RE(c4);
700		RE(d4) = RE(c3) - IM(c4);
701		RE(d5) = RE(c2) - IM(c5);
702		RE(d2) = RE(c2) + IM(c5);
703		IM(d5) = IM(c2) + RE(c5);
704		RE(d3) = RE(c3) + IM(c4);
705		IM(d4) = IM(c3) + RE(c4);
706
707		#if 1
708		ComplexMult(&RE(ch[ah+l1ido]), &IM(ch[ah+l1ido]),
709		RE(d2), IM(d2), RE(wa1[i]), IM(wa1[i]));
710		ComplexMult(&RE(ch[ah+2l1ido]), &IM(ch[ah+2l1ido]),
711		RE(d3), IM(d3), RE(wa2[i]), IM(wa2[i]));
712		ComplexMult(&RE(ch[ah+3l1ido]), &IM(ch[ah+3l1ido]),
713		RE(d4), IM(d4), RE(wa3[i]), IM(wa3[i]));
714		ComplexMult(&RE(ch[ah+4l1ido]), &IM(ch[ah+4l1ido]),
715		RE(d5), IM(d5), RE(wa4[i]), IM(wa4[i]));
716		#else
717		ComplexMult(&IM(ch[ah+l1ido]), &RE(ch[ah+l1ido]),
718		IM(d2), RE(d2), RE(wa1[i]), IM(wa1[i]));
719		ComplexMult(&IM(ch[ah+2l1ido]), &RE(ch[ah+2l1ido]),
720		IM(d3), RE(d3), RE(wa2[i]), IM(wa2[i]));
721		ComplexMult(&IM(ch[ah+3l1ido]), &RE(ch[ah+3l1ido]),
722		IM(d4), RE(d4), RE(wa3[i]), IM(wa3[i]));
723		ComplexMult(&IM(ch[ah+4l1ido]), &RE(ch[ah+4l1ido]),
724		IM(d5), RE(d5), RE(wa4[i]), IM(wa4[i]));
725		#endif
726		}
727		}
728		}
729		#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
730		*/
731	0	#endif
732	0	}
733	49.5k	}
734
735
736		/*----------------------------------------------------------------------
737		cfftf1, cfftf, cfftb, cffti1, cffti. Complex FFTs.
738		----------------------------------------------------------------------*/
739
740		static INLINE void cfftf1pos(uint16_t n, complex_t c, complex_t ch,
741		const uint16_t ifac, const complex_t wa,
742		const int8_t isign)
743	251k	{
744	251k	uint16_t i;
745	251k	uint16_t k1, l1, l2;
746	251k	uint16_t na, nf, ip, iw, ix2, ix3, ix4, ido;
747
748	251k	nf = ifac[1];
749	251k	na = 0;
750	251k	l1 = 1;
751	251k	iw = 0;
752
753	1.30M	for (k1 = 2; k1 <= nf+1; k1++)
754	1.05M	{
755	1.05M	ip = ifac[k1];
756	1.05M	l2 = ip*l1;
757	1.05M	ido = n / l2;
758
759	1.05M	switch (ip)
760	1.05M	{
761	813k	case 4:
762	813k	ix2 = iw + ido;
763	813k	ix3 = ix2 + ido;
764
765	813k	if (na == 0)
766	432k	passf4pos((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)c, ch, &wa[iw], &wa[ix2], &wa[ix3]);
767	380k	else
768	380k	passf4pos((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)ch, c, &wa[iw], &wa[ix2], &wa[ix3]);
769
770	813k	na = 1 - na;
771	813k	break;
772	150k	case 2:
773	150k	if (na == 0)
774	150k	passf2pos((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)c, ch, &wa[iw]);
775	0	else
776	0	passf2pos((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)ch, c, &wa[iw]);
777
778	150k	na = 1 - na;
779	150k	break;
780	46.3k	case 3:
781	46.3k	ix2 = iw + ido;
782
783	46.3k	if (na == 0)
784	24.2k	passf3((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)c, ch, &wa[iw], &wa[ix2], isign);
785	22.0k	else
786	22.0k	passf3((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)ch, c, &wa[iw], &wa[ix2], isign);
787
788	46.3k	na = 1 - na;
789	46.3k	break;
790	46.3k	case 5:
791	46.3k	ix2 = iw + ido;
792	46.3k	ix3 = ix2 + ido;
793	46.3k	ix4 = ix3 + ido;
794
795	46.3k	if (na == 0)
796	45.3k	passf5((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)c, ch, &wa[iw], &wa[ix2], &wa[ix3], &wa[ix4], isign);
797	931	else
798	931	passf5((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)ch, c, &wa[iw], &wa[ix2], &wa[ix3], &wa[ix4], isign);
799
800	46.3k	na = 1 - na;
801	46.3k	break;
802	1.05M	}
803
804	1.05M	l1 = l2;
805	1.05M	iw += (ip-1) * ido;
806	1.05M	}
807
808	251k	if (na == 0)
809	1.52k	return;
810
811	83.0M	for (i = 0; i < n; i++)
812	82.7M	{
813	82.7M	RE(c[i]) = RE(ch[i]);
814	82.7M	IM(c[i]) = IM(ch[i]);
815	82.7M	}
816	249k	}
817
818		static INLINE void cfftf1neg(uint16_t n, complex_t c, complex_t ch,
819		const uint16_t ifac, const complex_t wa,
820		const int8_t isign)
821	5.41k	{
822	5.41k	uint16_t i;
823	5.41k	uint16_t k1, l1, l2;
824	5.41k	uint16_t na, nf, ip, iw, ix2, ix3, ix4, ido;
825
826	5.41k	nf = ifac[1];
827	5.41k	na = 0;
828	5.41k	l1 = 1;
829	5.41k	iw = 0;
830
831	32.2k	for (k1 = 2; k1 <= nf+1; k1++)
832	26.8k	{
833	26.8k	ip = ifac[k1];
834	26.8k	l2 = ip*l1;
835	26.8k	ido = n / l2;
836
837	26.8k	switch (ip)
838	26.8k	{
839	15.2k	case 4:
840	15.2k	ix2 = iw + ido;
841	15.2k	ix3 = ix2 + ido;
842
843	15.2k	if (na == 0)
844	7.64k	passf4neg((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)c, ch, &wa[iw], &wa[ix2], &wa[ix3]);
845	7.64k	else
846	7.64k	passf4neg((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)ch, c, &wa[iw], &wa[ix2], &wa[ix3]);
847
848	15.2k	na = 1 - na;
849	15.2k	break;
850	5.23k	case 2:
851	5.23k	if (na == 0)
852	5.23k	passf2neg((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)c, ch, &wa[iw]);
853	0	else
854	0	passf2neg((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)ch, c, &wa[iw]);
855
856	5.23k	na = 1 - na;
857	5.23k	break;
858	3.18k	case 3:
859	3.18k	ix2 = iw + ido;
860
861	3.18k	if (na == 0)
862	75	passf3((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)c, ch, &wa[iw], &wa[ix2], isign);
863	3.10k	else
864	3.10k	passf3((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)ch, c, &wa[iw], &wa[ix2], isign);
865
866	3.18k	na = 1 - na;
867	3.18k	break;
868	3.18k	case 5:
869	3.18k	ix2 = iw + ido;
870	3.18k	ix3 = ix2 + ido;
871	3.18k	ix4 = ix3 + ido;
872
873	3.18k	if (na == 0)
874	3.10k	passf5((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)c, ch, &wa[iw], &wa[ix2], &wa[ix3], &wa[ix4], isign);
875	75	else
876	75	passf5((const uint16_t)ido, (const uint16_t)l1, (const complex_t*)ch, c, &wa[iw], &wa[ix2], &wa[ix3], &wa[ix4], isign);
877
878	3.18k	na = 1 - na;
879	3.18k	break;
880	26.8k	}
881
882	26.8k	l1 = l2;
883	26.8k	iw += (ip-1) * ido;
884	26.8k	}
885
886	5.41k	if (na == 0)
887	174	return;
888
889	2.58M	for (i = 0; i < n; i++)
890	2.58M	{
891	2.58M	RE(c[i]) = RE(ch[i]);
892	2.58M	IM(c[i]) = IM(ch[i]);
893	2.58M	}
894	5.23k	}
895
896		void cfftf(cfft_info cfft, complex_t c)
897	5.41k	{
898	5.41k	cfftf1neg(cfft->n, c, cfft->work, (const uint16_t)cfft->ifac, (const complex_t)cfft->tab, -1);
899	5.41k	}
900
901		void cfftb(cfft_info cfft, complex_t c)
902	251k	{
903	251k	cfftf1pos(cfft->n, c, cfft->work, (const uint16_t)cfft->ifac, (const complex_t)cfft->tab, +1);
904	251k	}
905
906		static void cffti1(uint16_t n, complex_t wa, uint16_t ifac)
907	16.5k	{
908	16.5k	static uint16_t ntryh[4] = {3, 4, 2, 5};
909		#ifndef FIXED_POINT
910		real_t arg, argh, argld, fi;
911		uint16_t ido, ipm;
912		uint16_t i1, k1, l1, l2;
913		uint16_t ld, ii, ip;
914		#endif
915	16.5k	uint16_t ntry = 0, i, j;
916	16.5k	uint16_t ib;
917	16.5k	uint16_t nf, nl, nq, nr;
918
919	16.5k	nl = n;
920	16.5k	nf = 0;
921	16.5k	j = 0;
922
923	44.3k	startloop:
924	44.3k	j++;
925
926	44.3k	if (j <= 4)
927	44.3k	ntry = ntryh[j-1];
928	0	else
929	0	ntry += 2;
930
931	44.3k	do
932	93.8k	{
933	93.8k	nq = nl / ntry;
934	93.8k	nr = nl - ntry*nq;
935
936	93.8k	if (nr != 0)
937	27.7k	goto startloop;
938
939	66.0k	nf++;
940	66.0k	ifac[nf+1] = ntry;
941	66.0k	nl = nq;
942
943	66.0k	if (ntry == 2 && nf != 1)
944	5.50k	{
945	26.3k	for (i = 2; i <= nf; i++)
946	20.8k	{
947	20.8k	ib = nf - i + 2;
948	20.8k	ifac[ib+1] = ifac[ib];
949	20.8k	}
950	5.50k	ifac[2] = 2;
951	5.50k	}
952	66.0k	} while (nl != 1);
953
954	16.5k	ifac[0] = n;
955	16.5k	ifac[1] = nf;
956
957		#ifndef FIXED_POINT
958		argh = (real_t)2.0*(real_t)M_PI / (real_t)n;
959		i = 0;
960		l1 = 1;
961
962		for (k1 = 1; k1 <= nf; k1++)
963		{
964		ip = ifac[k1+1];
965		ld = 0;
966		l2 = l1*ip;
967		ido = n / l2;
968		ipm = ip - 1;
969
970		for (j = 0; j < ipm; j++)
971		{
972		i1 = i;
973		RE(wa[i]) = 1.0;
974		IM(wa[i]) = 0.0;
975		ld += l1;
976		fi = 0;
977		argld = ld*argh;
978
979		for (ii = 0; ii < ido; ii++)
980		{
981		i++;
982		fi++;
983		arg = fi * argld;
984		RE(wa[i]) = (real_t)cos(arg);
985		#if 1
986		IM(wa[i]) = (real_t)sin(arg);
987		#else
988		IM(wa[i]) = (real_t)-sin(arg);
989		#endif
990		}
991
992		if (ip > 5)
993		{
994		RE(wa[i1]) = RE(wa[i]);
995		IM(wa[i1]) = IM(wa[i]);
996		}
997		}
998		l1 = l2;
999		}
1000		#else // FIXED_POINT
1001	16.5k	(void)wa; /* whoa! does it work for FIXED_POINT? */
1002	16.5k	#endif
1003	16.5k	}
1004
1005		cfft_info *cffti(uint16_t n)
1006	16.5k	{
1007	16.5k	cfft_info cfft = (cfft_info)faad_malloc(sizeof(cfft_info));
1008
1009	16.5k	cfft->n = n;
1010	16.5k	cfft->work = (complex_t)faad_malloc(nsizeof(complex_t));
1011
1012		#ifndef FIXED_POINT
1013		cfft->tab = (complex_t)faad_malloc(nsizeof(complex_t));
1014
1015		cffti1(n, cfft->tab, cfft->ifac);
1016		#else
1017	16.5k	cffti1(n, NULL, cfft->ifac);
1018
1019	16.5k	switch (n)
1020	16.5k	{
1021	4.35k	case 64: cfft->tab = (complex_t*)cfft_tab_64; break;
1022	4.35k	case 512: cfft->tab = (complex_t*)cfft_tab_512; break;
1023	0	#ifdef LD_DEC
1024	4.35k	case 256: cfft->tab = (complex_t*)cfft_tab_256; break;
1025	0	#endif
1026
1027	0	#ifdef ALLOW_SMALL_FRAMELENGTH
1028	1.15k	case 60: cfft->tab = (complex_t*)cfft_tab_60; break;
1029	1.15k	case 480: cfft->tab = (complex_t*)cfft_tab_480; break;
1030	0	#ifdef LD_DEC
1031	1.15k	case 240: cfft->tab = (complex_t*)cfft_tab_240; break;
1032	0	#endif
1033	0	#endif
1034	0	case 128: cfft->tab = (complex_t*)cfft_tab_128; break;
1035	16.5k	}
1036	16.5k	#endif
1037
1038	16.5k	return cfft;
1039	16.5k	}
1040
1041		void cfftu(cfft_info *cfft)
1042	16.5k	{
1043	16.5k	if (cfft->work) faad_free(cfft->work);
1044		#ifndef FIXED_POINT
1045		if (cfft->tab) faad_free(cfft->tab);
1046		#endif
1047
1048	16.5k	if (cfft) faad_free(cfft);
1049	16.5k	}
1050

Coverage Report

Created: 2026-02-14 07:13