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random_seed.h
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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 #ifndef AVUTIL_RANDOM_SEED_H
22 #define AVUTIL_RANDOM_SEED_H
23 
24 #include <stdint.h>
25 /**
26  * @addtogroup lavu_crypto
27  * @{
28  */
29 
30 /**
31  * Get a seed to use in conjunction with random functions.
32  * This function tries to provide a good seed at a best effort bases.
33  * Its possible to call this function multiple times if more bits are needed.
34  * It can be quite slow, which is why it should only be used as seed for a faster
35  * PRNG. The quality of the seed depends on the platform.
36  */
37 uint32_t av_get_random_seed(void);
38 
39 /**
40  * @}
41  */
42 
43 #endif /* AVUTIL_RANDOM_SEED_H */