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add ff_random_get_seed to be used in conjunction with random functions
Originally committed as revision 17868 to svn://svn.ffmpeg.org/ffmpeg/trunk
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a936475949
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@ -36,6 +36,7 @@ OBJS = adler32.o \
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md5.o \
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md5.o \
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mem.o \
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mem.o \
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random.o \
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random.o \
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random_seed.o \
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rational.o \
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rational.o \
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rc4.o \
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rc4.o \
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sha1.o \
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sha1.o \
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43
libavutil/random_seed.c
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43
libavutil/random_seed.c
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@ -0,0 +1,43 @@
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/*
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* Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include "timer.h"
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#include "random_seed.h"
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uint32_t ff_random_get_seed(void)
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{
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uint32_t seed;
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int fd;
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if ((fd = open("/dev/random", O_RDONLY)) == -1)
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fd = open("/dev/urandom", O_RDONLY);
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if (fd != -1){
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read(fd, &seed, 4);
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close(fd);
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return seed;
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}
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#ifdef AV_READ_TIME
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seed = AV_READ_TIME();
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#endif
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// XXX what to do ?
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return seed;
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}
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31
libavutil/random_seed.h
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31
libavutil/random_seed.h
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@ -0,0 +1,31 @@
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/*
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* Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_RANDOM_SEED_H
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#define AVUTIL_RANDOM_SEED_H
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#include <stdint.h>
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/**
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* Get a seed to use in conjuction with random functions
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*/
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uint32_t ff_random_get_seed();
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#endif /* AVUTIL_RANDOM_SEED_H */
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