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/*
***************************************************************************
*
* Author: Teunis van Beelen
*
* Copyright (C) 2022 - 2025 Teunis van Beelen
*
* Email: teuniz@protonmail.com
*
***************************************************************************
*
* This program 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, version 3 of the License.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
***************************************************************************
*/
#include "math_func.h"
static const char math_func_descr[MATH_MAX_FUNCS][32]=
{
"None",
"Square",
"Square Root",
"Absolute",
"Peak Hold",
};
mathfuncset_t * create_math_func(int func_f, int pk_smpls)
{
mathfuncset_t *st;
if((func_f < 0) || (func_f >= MATH_MAX_FUNCS))
{
return NULL;
}
st = (mathfuncset_t *) calloc(1, sizeof(mathfuncset_t));
if(st==NULL) return NULL;
st->func = func_f;
strlcpy(st->descr, math_func_descr[func_f], 32);
if(func_f == MATH_FUNC_PK_HOLD)
{
if(pk_smpls < 1)
{
free(st);
return NULL;
}
st->pk_hold_smpls_set = pk_smpls;
snprintf(st->descr + strlen(st->descr), 32 - strlen(st->descr), " %i smpls", pk_smpls);
}
return st;
}
int get_math_func_descr(int func_f, char *dest, int sz)
{
if((func_f < 0) || (func_f >= MATH_MAX_FUNCS) || (dest == NULL) || (sz < 1))
{
return -1;
}
strlcpy(dest, math_func_descr[func_f], sz);
return 0;
}
void free_math_func(mathfuncset_t *st)
{
free(st);
}
double run_math_func(double val, mathfuncset_t *st)
{
if(st->func == MATH_FUNC_SQUARE)
{
if(val < 0)
{
return (-val * val);
}
else
{
return (val * val);
}
}
else if(st->func == MATH_FUNC_SQRT)
{
if(val < 0)
{
return (-sqrt(-val));
}
else
{
return sqrt(val);
}
}
else if(st->func == MATH_FUNC_ABS)
{
return fabs(val);
}
else if(st->func == MATH_FUNC_PK_HOLD)
{
st->pk_hold_smpl_cntr++;
if((val > st->pk_hold_val) || (st->pk_hold_smpl_cntr >= st->pk_hold_smpls_set))
{
st->pk_hold_val = val;
st->pk_hold_smpl_cntr = 0;
return val;
}
return st->pk_hold_val;
}
else if(st->func == MATH_FUNC_NONE)
{
return val;
}
return 0;
}
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