ref: e0831a18c4ff69f2e676f1e9ce0775ffdaf4571b
dir: /transfo.h/
#ifndef TRANSFORM_H
#define TRANSFORM_H
void MDCT(double* data, int N);
void FFT(double *data, int nn, int isign);
#define c_re(c) ((c).re)
#define c_im(c) ((c).im)
typedef struct {
double re, im;
} fftw_complex_d;
#define DEFINE_PFFTW(size) \
void pfftw_d_##size(fftw_complex_d *input); \
int pfftw_d_permutation_##size(int i);
DEFINE_PFFTW(16)
DEFINE_PFFTW(32)
DEFINE_PFFTW(64)
DEFINE_PFFTW(128)
DEFINE_PFFTW(256)
DEFINE_PFFTW(512)
DEFINE_PFFTW(2048)
void MakeFFTOrder(void);
void MakeFFT2Order(void);
extern int unscambled64[64]; /* the permutation array for FFT64*/
extern int unscambled256[256]; /* the permutation array for FFT256*/
extern int unscambled512[512]; /* the permutation array for FFT512*/
extern int unscambled2048[2048]; /* the permutation array for FFT2048*/
extern fftw_complex_d FFTarray[2048]; /* the array for in-place FFT */
#endif