- import version 0.9.1 from upstream

/*
 * lingot, a musical instrument tuner.
 *
 * Copyright (C) 2004-2011  Ibán Cereijo Graña, Jairo Chapela Martínez.
 *
 * This file is part of lingot.
 *
 * lingot is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * lingot is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with lingot; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _LINGOT_FFT_H_
#define _LINGOT_FFT_H_

/*
 Fourier transforms.
 */

#include "lingot-defs.h"

#ifndef LIB_FFTW

#  include "lingot-complex.h"
#  include "lingot-config.h"

void lingot_fft_create_phase_factors(LingotConfig* conf);
void lingot_fft_destroy_phase_factors();

// Fast Fourier Transform implementation.
void lingot_fft_fft(FLT* in, LingotComplex* out, unsigned long int N);

#endif // not LIB_FFTW

// Spectral Power Distribution (SPD) esteem, selectively in frequency.
void lingot_fft_spd(FLT* in, int N1, FLT wi, FLT dw, FLT* out, int N2);

// first and second SPD derivatives at frequency w.
void lingot_fft_spd_diffs(FLT* in, int N, FLT w, FLT* out_d1, FLT* out_d2);

#endif