apps/codecs/libspeex/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 typedef struct kiss_fftr_state *kiss_fftr_cfg;
  19
  20
  21 kiss_fftr_cfg kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenmem);
  22 /*
  23  nfft must be even
  24
  25  If you don't care to allocate space, use mem = lenmem = NULL
  26 */
  27
  28
  29 void kiss_fftr(kiss_fftr_cfg cfg,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata);
  30 /*
  31  input timedata has nfft scalar points
  32  output freqdata has nfft/2+1 complex points
  33 */
  34
  35 void kiss_fftr2(kiss_fftr_cfg st,const kiss_fft_scalar *timedata,kiss_fft_scalar *freqdata);
  36
  37 void kiss_fftri(kiss_fftr_cfg cfg,const kiss_fft_cpx *freqdata,kiss_fft_scalar *timedata);
  38
  39 void kiss_fftri2(kiss_fftr_cfg st,const kiss_fft_scalar *freqdata, kiss_fft_scalar *timedata);
  40
  41 /*
  42  input freqdata has  nfft/2+1 complex points
  43  output timedata has nfft scalar points
  44 */
  45
  46 #define kiss_fftr_free speex_free
  47
  48 #ifdef __cplusplus
  49 }
  50 #endif
  51 #endif