ref: e8b6830f538e41a5a0db076bd183db43e3b99b3e
dir: /libcelt/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;
kiss_fftr_cfg kiss_fftr_alloc(int nfft,void * mem, size_t * lenmem);
/*
nfft must be even
If you don't care to allocate space, use mem = lenmem = NULL
*/
/*
input timedata has nfft scalar points
output freqdata has nfft/2+1 complex points, packed into nfft scalar points
*/
void kiss_fftr(kiss_fftr_cfg st,const kiss_fft_scalar *timedata,kiss_fft_scalar *freqdata);
void kiss_fftri(kiss_fftr_cfg st,const kiss_fft_scalar *freqdata, kiss_fft_scalar *timedata);
/*
input freqdata has nfft/2+1 complex points, packed into nfft scalar points
output timedata has nfft scalar points
*/
#define kiss_fftr_free speex_free
#ifdef __cplusplus
}
#endif
#endif