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[libav.git] / libavutil / random_seed.c
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1/*
2 * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include <unistd.h>
22#include <fcntl.h>
23#include "timer.h"
24#include "random_seed.h"
576fb48e 25#include "avutil.h"
48d58e59 26
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27static int read_random(uint32_t *dst, const char *file)
28{
29 int fd = open(file, O_RDONLY);
30 int err = -1;
31
32 if (fd == -1)
33 return -1;
9958096e 34 err = read(fd, dst, sizeof(*dst));
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35 close(fd);
36
37 return err;
38}
39
576fb48e 40uint32_t av_get_random_seed(void)
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41{
42 uint32_t seed;
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43 int err;
44
45 err = read_random(&seed, "/dev/urandom");
46 if (err != sizeof(seed))
47 err = read_random(&seed, "/dev/random");
48 if (err == sizeof(seed))
49 return seed;
50
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51#ifdef AV_READ_TIME
52 seed = AV_READ_TIME();
53#endif
54 // XXX what to do ?
55 return seed;
56}
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57
58#if LIBAVUTIL_VERSION_MAJOR < 51
59attribute_deprecated uint32_t ff_random_get_seed(void);
60uint32_t ff_random_get_seed(void)
61{
62 return av_get_random_seed();
63}
64#endif