tests: Move all test programs to a subdirectory
[libav.git] / libavutil / tests / lfg.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "libavutil/log.h"
20 #include "libavutil/timer.h"
21 #include "libavutil/lfg.h"
22
23 int main(void)
24 {
25 int x = 0;
26 int i, j;
27 AVLFG state;
28
29 av_lfg_init(&state, 0xdeadbeef);
30 for (j = 0; j < 10000; j++) {
31 START_TIMER
32 for (i = 0; i < 624; i++)
33 x += av_lfg_get(&state);
34 STOP_TIMER("624 calls of av_lfg_get");
35 }
36 av_log(NULL, AV_LOG_ERROR, "final value:%X\n", x);
37
38 /* BMG usage example */
39 {
40 double mean = 1000;
41 double stddev = 53;
42
43 av_lfg_init(&state, 42);
44
45 for (i = 0; i < 1000; i += 2) {
46 double bmg_out[2];
47 av_bmg_get(&state, bmg_out);
48 av_log(NULL, AV_LOG_INFO,
49 "%f\n%f\n",
50 bmg_out[0] * stddev + mean,
51 bmg_out[1] * stddev + mean);
52 }
53 }
54
55 return 0;
56 }