1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <limits.h>
20 #include <stdio.h>
21
22 #include "libavutil/internal.h"
23 #include "libavutil/lfg.h"
24 #include "libavutil/lls.h"
25 #include "libavutil/mem_internal.h"
26
main(void)27 int main(void)
28 {
29 LLSModel m;
30 int i, order;
31 AVLFG lfg;
32
33 av_lfg_init(&lfg, 1);
34 avpriv_init_lls(&m, 3);
35
36 for (i = 0; i < 100; i++) {
37 LOCAL_ALIGNED(32, double, var, [4]);
38 double eval;
39
40 var[0] = (av_lfg_get(&lfg) / (double) UINT_MAX - 0.5) * 2;
41 var[1] = var[0] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
42 var[2] = var[1] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
43 var[3] = var[2] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
44 m.update_lls(&m, var);
45 avpriv_solve_lls(&m, 0.001, 0);
46 for (order = 0; order < 3; order++) {
47 eval = m.evaluate_lls(&m, var + 1, order);
48 printf("real:%9f order:%d pred:%9f var:%f coeffs:%f %9f %9f\n",
49 var[0], order, eval, sqrt(m.variance[order] / (i + 1)),
50 m.coeff[order][0], m.coeff[order][1],
51 m.coeff[order][2]);
52 }
53 }
54 return 0;
55 }
56