mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-22 15:23:11 +00:00
56 lines
1.8 KiB
C
56 lines
1.8 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 <limits.h>
|
|
#include <stdio.h>
|
|
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/lfg.h"
|
|
#include "libavutil/lls.h"
|
|
#include "libavutil/mem_internal.h"
|
|
|
|
int main(void)
|
|
{
|
|
LLSModel m;
|
|
int i, order;
|
|
AVLFG lfg;
|
|
|
|
av_lfg_init(&lfg, 1);
|
|
avpriv_init_lls(&m, 3);
|
|
|
|
for (i = 0; i < 100; i++) {
|
|
LOCAL_ALIGNED(32, double, var, [4]);
|
|
double eval;
|
|
|
|
var[0] = (av_lfg_get(&lfg) / (double) UINT_MAX - 0.5) * 2;
|
|
var[1] = var[0] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
|
|
var[2] = var[1] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
|
|
var[3] = var[2] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
|
|
m.update_lls(&m, var);
|
|
avpriv_solve_lls(&m, 0.001, 0);
|
|
for (order = 0; order < 3; order++) {
|
|
eval = m.evaluate_lls(&m, var + 1, order);
|
|
printf("real:%9f order:%d pred:%9f var:%f coeffs:%f %9f %9f\n",
|
|
var[0], order, eval, sqrt(m.variance[order] / (i + 1)),
|
|
m.coeff[order][0], m.coeff[order][1],
|
|
m.coeff[order][2]);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|