mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-16 20:35:23 +00:00
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/*
|
|
* Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; 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 "random_seed.h"
|
|
|
|
uint32_t ff_random_get_seed(void)
|
|
{
|
|
uint32_t seed;
|
|
int fd;
|
|
|
|
if ((fd = open("/dev/random", O_RDONLY)) == -1)
|
|
fd = open("/dev/urandom", O_RDONLY);
|
|
if (fd != -1){
|
|
int err = read(fd, &seed, 4);
|
|
close(fd);
|
|
if (err == 4)
|
|
return seed;
|
|
}
|
|
#ifdef AV_READ_TIME
|
|
seed = AV_READ_TIME();
|
|
#endif
|
|
// XXX what to do ?
|
|
return seed;
|
|
}
|