kiss_fftr.h revision 98913fed6520d8849fb2e246be943e04474aefa4 
1#ifndef KISS_FTR_H
2#define KISS_FTR_H
3
4#include "kiss_fft.h"
5#ifdef __cplusplus
6extern "C" {
7#endif
8
9
10/*
11
12 Real optimized version can save about 45% cpu time vs. complex fft of a real seq.
13
14
15
16 */
17
18typedef struct kiss_fftr_state *kiss_fftr_cfg;
19
20
21kiss_fftr_cfg kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenmem);
22/*
23 nfft must be even
24
25 If you don't care to allocate space, use mem = lenmem = NULL
26*/
27
28
29void kiss_fftr(kiss_fftr_cfg cfg,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata);
30/*
31 input timedata has nfft scalar points
32 output freqdata has nfft/2+1 complex points
33*/
34
35void kiss_fftr2(kiss_fftr_cfg st,const kiss_fft_scalar *timedata,kiss_fft_scalar *freqdata);
36
37void kiss_fftri(kiss_fftr_cfg cfg,const kiss_fft_cpx *freqdata,kiss_fft_scalar *timedata);
38
39void kiss_fftri2(kiss_fftr_cfg st,const kiss_fft_scalar *freqdata, kiss_fft_scalar *timedata);
40
41/*
42 input freqdata has  nfft/2+1 complex points
43 output timedata has nfft scalar points
44*/
45
46#define kiss_fftr_free speex_free
47
48#ifdef __cplusplus
49}
50#endif
51#endif
52