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time.c
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1 /*
2  * Copyright (c) 2000-2003 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "config.h"
22 
23 #include <stddef.h>
24 #include <stdint.h>
25 #include <time.h>
26 #if HAVE_GETTIMEOFDAY
27 #include <sys/time.h>
28 #endif
29 #if HAVE_UNISTD_H
30 #include <unistd.h>
31 #endif
32 #if HAVE_WINDOWS_H
33 #include <windows.h>
34 #endif
35 
36 #include "libavutil/time.h"
37 #include "error.h"
38 
39 int64_t av_gettime(void)
40 {
41 #if HAVE_GETTIMEOFDAY
42  struct timeval tv;
43  gettimeofday(&tv, NULL);
44  return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
45 #elif HAVE_GETSYSTEMTIMEASFILETIME
46  FILETIME ft;
47  int64_t t;
48  GetSystemTimeAsFileTime(&ft);
49  t = (int64_t)ft.dwHighDateTime << 32 | ft.dwLowDateTime;
50  return t / 10 - 11644473600000000; /* Jan 1, 1601 */
51 #else
52  return -1;
53 #endif
54 }
55 
56 int av_usleep(unsigned usec)
57 {
58 #if HAVE_NANOSLEEP
59  struct timespec ts = { usec / 1000000, usec % 1000000 * 1000 };
60  while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
61  return 0;
62 #elif HAVE_USLEEP
63  return usleep(usec);
64 #elif HAVE_SLEEP
65  Sleep(usec / 1000);
66  return 0;
67 #else
68  return AVERROR(ENOSYS);
69 #endif
70 }