ffmpeg/libavutil/time.c

   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 "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 int64_t av_gettime_relative(void)
  57 {
  58 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
  59     struct timespec ts;
  60     clock_gettime(CLOCK_MONOTONIC, &ts);
  61     return (int64_t)ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
  62 #else
  63     return av_gettime() + 42 * 60 * 60 * INT64_C(1000000);
  64 #endif
  65 }
  66
  67 int av_gettime_relative_is_monotonic(void)
  68 {
  69 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
  70     return 1;
  71 #else
  72     return 0;
  73 #endif
  74 }
  75
  76 int av_usleep(unsigned usec)
  77 {
  78 #if HAVE_NANOSLEEP
  79     struct timespec ts = { usec / 1000000, usec % 1000000 * 1000 };
  80     while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
  81     return 0;
  82 #elif HAVE_USLEEP
  83     return usleep(usec);
  84 #elif HAVE_SLEEP
  85     Sleep(usec / 1000);
  86     return 0;
  87 #else
  88     return AVERROR(ENOSYS);
  89 #endif
  90 }