1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/*
* Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <unistd.h>
#include <fcntl.h>
#include "timer.h"
#include "time.h"
#include "random_seed.h"
#include "avutil.h"
static int read_random(uint32_t *dst, const char *file)
{
int fd = open(file, O_RDONLY);
int err = -1;
if (fd == -1)
return -1;
err = read(fd, dst, sizeof(*dst));
close(fd);
return err;
}
static uint32_t get_generic_seed(void)
{
clock_t last_t=0;
int bits=0;
uint64_t random=0;
unsigned i;
float s=0.000000000001;
for(i=0;bits<64;i++){
clock_t t= clock();
if(last_t && fabs(t-last_t)>s || t==(clock_t)-1){
if(i<10000 && s<(1<<24)){
s+=s;
i=t=0;
}else{
random= 2*random + (i&1);
bits++;
}
}
last_t= t;
}
#ifdef AV_READ_TIME
random ^= AV_READ_TIME();
#else
random ^= clock();
#endif
random += random>>32;
return random;
}
uint32_t av_get_random_seed(void)
{
uint32_t seed;
if (read_random(&seed, "/dev/urandom") == sizeof(seed))
return seed;
if (read_random(&seed, "/dev/random") == sizeof(seed))
return seed;
return get_generic_seed();
}
#if LIBAVUTIL_VERSION_MAJOR < 51
attribute_deprecated uint32_t ff_random_get_seed(void);
uint32_t ff_random_get_seed(void)
{
return av_get_random_seed();
}
#endif
|
