48 lines
911 B
C
48 lines
911 B
C
#ifndef KISS_FTR_H
|
|
#define KISS_FTR_H
|
|
|
|
#include "KissFFT.h"
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
|
|
Real optimized version can save about 45% cpu time vs. complex fft of a real
|
|
seq.
|
|
|
|
|
|
|
|
*/
|
|
|
|
typedef struct kiss_fftr_state *kiss_fftr_cfg;
|
|
|
|
kiss_fftr_cfg kiss_fftr_alloc(int nfft, int inverse_fft, void *mem,
|
|
size_t *lenmem);
|
|
/*
|
|
nfft must be even
|
|
|
|
If you don't care to allocate space, use mem = lenmem = NULL
|
|
*/
|
|
|
|
void kiss_fftr(kiss_fftr_cfg cfg, const kiss_fft_scalar *timedata,
|
|
kiss_fft_cpx *freqdata);
|
|
/*
|
|
input timedata has nfft scalar points
|
|
output freqdata has nfft/2+1 complex points
|
|
*/
|
|
|
|
void kiss_fftri(kiss_fftr_cfg cfg, const kiss_fft_cpx *freqdata,
|
|
kiss_fft_scalar *timedata);
|
|
/*
|
|
input freqdata has nfft/2+1 complex points
|
|
output timedata has nfft scalar points
|
|
*/
|
|
|
|
#define kiss_fftr_free free
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif
|