ref: 372cbebbc8a0b471e31f1cd396bbe22d34f382c1
dir: /examples/tests/test-fft.c/
#include "aubio_priv.h"
#include "aubio.h"
int main(){
uint_t i,j;
/* allocate some memory */
uint_t win_s = 1024; /* window size */
uint_t channels = 1; /* number of channel */
fvec_t * in = new_fvec (win_s, channels); /* input buffer */
cvec_t * fftgrain = new_cvec (win_s, channels); /* fft norm and phase */
fvec_t * out = new_fvec (win_s, channels); /* output buffer */
/* allocate fft and other memory space */
aubio_fft_t * fft = new_aubio_fft(win_s); /* fftw interface */
smpl_t * w = AUBIO_ARRAY(smpl_t,win_s); /* window */
/* complex spectral data */
fft_data_t ** spec = AUBIO_ARRAY(fft_data_t*,channels);
for (i=0; i < channels; i++)
spec[i] = AUBIO_ARRAY(fft_data_t,win_s);
/* initialize the window (see mathutils.c) */
aubio_window(w,win_s,aubio_win_hanningz);
/* fill input with some data */
/* execute stft */
for (i=0; i < channels; i++) {
aubio_fft_do (fft,in->data[i],spec[i],win_s);
/* put norm and phase into fftgrain */
aubio_fft_getnorm(fftgrain->norm[i], spec[i], win_s/2+1);
aubio_fft_getphas(fftgrain->phas[i], spec[i], win_s/2+1);
}
/* execute inverse fourier transform */
for (i=0; i < channels; i++) {
for (j=0; j<win_s/2+1; j++) {
spec[i][j] = CEXPC(I*aubio_unwrap2pi(fftgrain->phas[i][j]));
spec[i][j] *= fftgrain->norm[i][j];
}
aubio_fft_rdo(fft,spec[i],out->data[i],win_s);
}
return 0;
}