kopia lustrzana https://github.com/Dsplib/libdspl-2.0
68 wiersze
1.7 KiB
C
68 wiersze
1.7 KiB
C
/*
|
|
* Copyright (c) 2015-2024 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"
|
|
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
#endif
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
#endif
|
|
int DSPL_API fft_mag(double* x, int n, fft_t* pfft,
|
|
double fs, int flag,
|
|
double* mag, double* freq)
|
|
{
|
|
int k, err;
|
|
fft_t *cfft = NULL;
|
|
|
|
if(pfft)
|
|
cfft = pfft;
|
|
else
|
|
{
|
|
cfft = (fft_t*) malloc(sizeof(fft_t));
|
|
memset(cfft, 0, sizeof(fft_t));
|
|
}
|
|
|
|
err = fft_abs(x, n, cfft, fs, flag, mag, freq);
|
|
if(err != RES_OK)
|
|
goto error_proc;
|
|
|
|
if(mag)
|
|
{
|
|
if(flag & DSPL_FLAG_LOGMAG)
|
|
for(k = 0; k < n; k++)
|
|
mag[k] = 20.0 * log10(mag[k] + DBL_EPSILON);
|
|
else
|
|
for(k = 0; k < n; k++)
|
|
mag[k] *= mag[k];
|
|
}
|
|
error_proc:
|
|
if(cfft && cfft != pfft)
|
|
free(cfft);
|
|
return err;
|
|
}
|