One-dimensional Complex-to-complex FFTs

fftw_plan fftw_create_plan(int n, fftw_direction dir, int flags);

fftw_plan fftw_create_plan_specific(int n, fftw_direction dir, int flags, fftw_complex *in, int istride, fftw_complex *out, int ostride);

void fftw(fftw_plan plan, int howmany, fftw_complex *in, int istride, int idist, fftw_complex *out, int ostride, int odist);

void fftw_one(fftw_plan plan, fftw_complex *in , fftw_complex *out);

void fftw_destroy_plan(fftw_plan plan);