apps/plugins/fft/kiss_fftr.h

   1 #ifndef KISS_FTR_H
   2 #define KISS_FTR_H
   3
   4 #include "kiss_fft.h"
   5 #ifdef __cplusplus
   6 extern "C" {
   7 #endif
   8
   9
  10 /*
  11
  12  Real optimized version can save about 45% cpu time vs. complex fft of a real seq.
  13
  14
  15
  16  */
  17
  18 struct kiss_fftr_state{
  19     kiss_fft_cfg substate;
  20     kiss_fft_cpx * tmpbuf;
  21     kiss_fft_cpx * super_twiddles;
  22 #ifdef USE_SIMD
  23     long pad;
  24 #endif
  25 };
  26 typedef struct kiss_fftr_state *kiss_fftr_cfg;
  27
  28
  29 kiss_fftr_cfg kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenmem);
  30 /*
  31  nfft must be even
  32
  33  If you don't care to allocate space, use mem = lenmem = NULL
  34 */
  35
  36
  37 void kiss_fftr(kiss_fftr_cfg cfg,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata);
  38 /*
  39  input timedata has nfft scalar points
  40  output freqdata has nfft/2+1 complex points
  41 */
  42
  43 void kiss_fftri(kiss_fftr_cfg cfg,const kiss_fft_cpx *freqdata,kiss_fft_scalar *timedata);
  44 /*
  45  input freqdata has  nfft/2+1 complex points
  46  output timedata has nfft scalar points
  47 */
  48
  49 #define kiss_fftr_free free
  50
  51 #ifdef __cplusplus
  52 }
  53 #endif
  54 #endif