pcl: kiss_fftr.h Source File

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00001 #ifndef KISS_FTR_H
00002 #define KISS_FTR_H
00003 
00004 #include "kiss_fft.h"
00005 #ifdef __cplusplus
00006 extern "C" {
00007 #endif
00008 
00009     
00010 /* 
00011  
00012  Real optimized version can save about 45% cpu time vs. complex fft of a real seq.
00013 
00014  
00015  
00016  */
00017 
00018 typedef struct kiss_fftr_state *kiss_fftr_cfg;
00019 
00020 
00021 kiss_fftr_cfg PCL_EXPORTS kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenmem);
00022 /*
00023  nfft must be even
00024 
00025  If you don't care to allocate space, use mem = lenmem = NULL 
00026 */
00027 
00028 
00029 void PCL_EXPORTS kiss_fftr(kiss_fftr_cfg cfg,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata);
00030 /*
00031  input timedata has nfft scalar points
00032  output freqdata has nfft/2+1 complex points
00033 */
00034 
00035 void PCL_EXPORTS kiss_fftri(kiss_fftr_cfg cfg,const kiss_fft_cpx *freqdata,kiss_fft_scalar *timedata);
00036 /*
00037  input freqdata has  nfft/2+1 complex points
00038  output timedata has nfft scalar points
00039 */
00040 
00041 #define kiss_fftr_free free
00042 
00043 #ifdef __cplusplus
00044 }
00045 #endif
00046 #endif