ref: a4863786d27a554fdd1929d6b1ca4516c541b05f
dir: /kiss_fftr.h/
#ifndef KISS_FTR_H
#define KISS_FTR_H
#include "kiss_fft.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;
#pragma incomplete kiss_fftr_cfg
kiss_fftr_cfg *kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, usize * lenmem);
/*
nfft must be even
If you don't care to allocate space, use mem = lenmem = NULL
*/
int 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
*/
int 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