ffmpeg / libavutil / random_seed.c @ d71ad089
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1 | 48d58e59 | Baptiste Coudurier | /*
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2 | * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
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3 | *
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4 | * This file is part of FFmpeg.
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5 | *
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6 | * FFmpeg is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU Lesser General Public
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2.1 of the License, or (at your option) any later version.
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10 | *
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11 | * FFmpeg is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Lesser General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Lesser General Public
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17 | * License along with FFmpeg; if not, write to the Free Software
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 | */
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20 | |||
21 | #include <unistd.h> |
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22 | #include <fcntl.h> |
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23 | #include "timer.h" |
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24 | #include "random_seed.h" |
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25 | |||
26 | uint32_t ff_random_get_seed(void)
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27 | { |
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28 | uint32_t seed; |
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29 | int fd;
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30 | |||
31 | if ((fd = open("/dev/random", O_RDONLY)) == -1) |
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32 | fd = open("/dev/urandom", O_RDONLY);
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33 | if (fd != -1){ |
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34 | read(fd, &seed, 4);
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35 | close(fd); |
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36 | return seed;
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37 | } |
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38 | #ifdef AV_READ_TIME
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39 | seed = AV_READ_TIME(); |
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40 | #endif
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41 | // XXX what to do ?
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42 | return seed;
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43 | } |