dspl/conv_8c_source.html

/*

* Copyright (c) 2015-2024 Sergey Bakhurin

* Digital Signal Processing Library [http://dsplib.org]

*

* This file is part of DSPL.

*

* 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 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 General Public License

* along with Foobar.  If not, see <http://www.gnu.org/licenses/>.

*/


#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "dspl.h"


#ifdef DOXYGEN_ENGLISH


#endif

#ifdef DOXYGEN_RUSSIAN


#endif

int DSPL_API conv(double* a, int na, double* b, int nb, double* c)

{

    int k;

    int n;


    double *t;

    size_t bufsize;


    if(!a || !b || !c)

        return ERROR_PTR;

    if(na < 1 || nb < 1)

        return ERROR_SIZE;


    bufsize = (na + nb - 1) * sizeof(double);


    if((a != c) && (b != c))

        t = c;

    else

        t = (double*)malloc(bufsize);


    memset(t, 0, bufsize);


    for(k = 0; k < na; k++)

        for(n = 0; n < nb; n++)

            t[k+n] += a[k]*b[n];


    if(t!=c)

    {

        memcpy(c, t, bufsize);

        free(t);

    }

    return RES_OK;

}