--- /dev/null
+#ifndef KISS_FTR_F64_H
+#define KISS_FTR_F64_H
+
+#include "kiss_fft_f64.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_f64_state *kiss_fftr_f64_cfg;
+
+
+kiss_fftr_f64_cfg kiss_fftr_f64_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_f64(kiss_fftr_f64_cfg cfg,const kiss_fft_f64_scalar *timedata,kiss_fft_f64_cpx *freqdata);
+/*
+ input timedata has nfft scalar points
+ output freqdata has nfft/2+1 complex points
+*/
+
+void kiss_fftri_f64(kiss_fftr_f64_cfg cfg,const kiss_fft_f64_cpx *freqdata,kiss_fft_f64_scalar *timedata);
+/*
+ input freqdata has nfft/2+1 complex points
+ output timedata has nfft scalar points
+*/
+
+#define kiss_fftr_f64_free free
+
+#ifdef __cplusplus
+}
+#endif
+#endif