Point Cloud Library (PCL)  1.12.0
kiss_fftr.h
1 #pragma once
2 
3 #include "kiss_fft.h"
4 #ifdef __cplusplus
5 extern "C" {
6 #endif
7 
8 
9 /*
10 
11  Real optimized version can save about 45% cpu time vs. complex fft of a real seq.
12 
13 
14 
15  */
16 
17 typedef struct kiss_fftr_state *kiss_fftr_cfg;
18 
19 
20 kiss_fftr_cfg PCL_EXPORTS kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenmem);
21 /*
22  nfft must be even
23 
24  If you don't care to allocate space, use mem = lenmem = NULL
25 */
26 
27 
28 void PCL_EXPORTS kiss_fftr(kiss_fftr_cfg cfg,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata);
29 /*
30  input timedata has nfft scalar points
31  output freqdata has nfft/2+1 complex points
32 */
33 
34 void PCL_EXPORTS kiss_fftri(kiss_fftr_cfg cfg,const kiss_fft_cpx *freqdata,kiss_fft_scalar *timedata);
35 /*
36  input freqdata has nfft/2+1 complex points
37  output timedata has nfft scalar points
38 */
39 
40 #define kiss_fftr_free free
41 
42 #ifdef __cplusplus
43 }
44 #endif
#define PCL_EXPORTS
Definition: pcl_macros.h:323