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67 lines
1.7 KiB
67 lines
1.7 KiB
/* |
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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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#include "avutil.h" |
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static int read_random(uint32_t *dst, const char *file) |
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{ |
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int fd = open(file, O_RDONLY); |
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int err = -1; |
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if (fd == -1) |
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return -1; |
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#if HAVE_FCNTL && defined(O_NONBLOCK) |
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if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK) != -1) |
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#endif |
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err = read(fd, dst, sizeof(*dst)); |
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close(fd); |
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return err; |
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} |
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uint32_t av_get_random_seed(void) |
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{ |
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uint32_t seed; |
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int err; |
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err = read_random(&seed, "/dev/urandom"); |
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if (err != sizeof(seed)) |
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err = read_random(&seed, "/dev/random"); |
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if (err == sizeof(seed)) |
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return seed; |
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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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#if LIBAVUTIL_VERSION_MAJOR < 51 |
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attribute_deprecated uint32_t ff_random_get_seed(void); |
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uint32_t ff_random_get_seed(void) |
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{ |
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return av_get_random_seed(); |
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} |
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#endif
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