1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/*
* Copyright (C) 2000-2003 the xine project
*
* This file is part of xine, a free video player.
*
* xine is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* xine is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
*/
#ifndef FFT_H
#define FFT_H
struct complex_s
{
double re;
double im;
};
typedef struct complex_s complex_t;
struct fft_s {
int bits;
double *SineTable;
double *CosineTable;
double *WinTable;
};
typedef struct fft_s fft_t;
fft_t *fft_new (int bits);
void fft_dispose(fft_t *fft);
void fft_compute (fft_t *fft, complex_t wave[]);
void fft_window (fft_t *fft, complex_t wave[]);
double fft_amp (int n, complex_t wave[], int bits);
double fft_phase (int n, complex_t wave[], int bits);
void fft_scale (complex_t wave[], int bits);
#endif /* FFT_H */
|
