2 * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
4 * This file is part of FFmpeg.
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.
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.
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
24 #include "random_seed.h"
27 static int read_random(uint32_t *dst, const char *file)
29 int fd = open(file, O_RDONLY);
34 err = read(fd, dst, sizeof(*dst));
40 uint32_t av_get_random_seed(void)
45 err = read_random(&seed, "/dev/urandom");
46 if (err != sizeof(seed))
47 err = read_random(&seed, "/dev/random");
48 if (err == sizeof(seed))
52 seed = AV_READ_TIME();
58 #if LIBAVUTIL_VERSION_MAJOR < 51
59 attribute_deprecated uint32_t ff_random_get_seed(void);
60 uint32_t ff_random_get_seed(void)
62 return av_get_random_seed();