55 lines
1,019 B
C
55 lines
1,019 B
C
|
#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.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct kiss_fftr_state{
|
||
|
|
kiss_fft_cfg substate;
|
||
|
|
kiss_fft_cpx * tmpbuf;
|
||
|
|
kiss_fft_cpx * super_twiddles;
|
||
|
|
#ifdef USE_SIMD
|
||
|
|
long pad;
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
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
|