ref: b84dd4bf5d05c1f9b953da9a905a8fce7145d6bf
dir: /libfaac/kiss_fft/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,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