mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 20:19:55 +00:00
4f173d055c
* commit '798845ce7e5b7fdd17c7269c5d267fb487d9c46f': testprogs: Add missing libm.h includes Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
|
|
#include "libavutil/libm.h"
|
|
|
|
#include "iirfilter.h"
|
|
|
|
#define FILT_ORDER 4
|
|
#define SIZE 1024
|
|
|
|
int main(void)
|
|
{
|
|
struct FFIIRFilterCoeffs *fcoeffs = NULL;
|
|
struct FFIIRFilterState *fstate = NULL;
|
|
float cutoff_coeff = 0.4;
|
|
int16_t x[SIZE], y[SIZE];
|
|
int i;
|
|
|
|
fcoeffs = ff_iir_filter_init_coeffs(NULL, FF_FILTER_TYPE_BUTTERWORTH,
|
|
FF_FILTER_MODE_LOWPASS, FILT_ORDER,
|
|
cutoff_coeff, 0.0, 0.0);
|
|
fstate = ff_iir_filter_init_state(FILT_ORDER);
|
|
|
|
for (i = 0; i < SIZE; i++)
|
|
x[i] = lrint(0.75 * INT16_MAX * sin(0.5 * M_PI * i * i / SIZE));
|
|
|
|
ff_iir_filter(fcoeffs, fstate, SIZE, x, 1, y, 1);
|
|
|
|
for (i = 0; i < SIZE; i++)
|
|
printf("%6d %6d\n", x[i], y[i]);
|
|
|
|
ff_iir_filter_free_coeffsp(&fcoeffs);
|
|
ff_iir_filter_free_statep(&fstate);
|
|
return 0;
|
|
}
|