fft.c

/*
* Copyright (c) 2015-2022 Sergey Bakhurin
* Digital Signal Processing Library [http://dsplib.org]
*
* This file is part of libdspl-2.0.
*
* is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser    General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DSPL 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 Lesser General Public License
* along with Foobar.    If not, see <http://www.gnu.org/licenses/>.
*/
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <float.h>
 
#include "dspl.h"
#include "dft.h"
 
 
#ifdef DOXYGEN_ENGLISH
#endif
#ifdef DOXYGEN_RUSSIAN
#endif
int DSPL_API fft(double* x, int n, fft_t* pfft, complex_t* y)
{
    int err;
 
    if(!x || !pfft || !y)
        return ERROR_PTR;
    if(n<1)
        return ERROR_SIZE;
 
 
    err = fft_create(pfft, n);
    if(err != RES_OK)
        return err;
 
    re2cmplx(x, n, pfft->t1);
 
    return fft_krn(pfft->t1, y, pfft, n, 0);
}