libavutil/time.c

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