ffmpeg/libavutil/time.h

   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 #ifndef AVUTIL_TIME_H
  22 #define AVUTIL_TIME_H
  23
  24 #include <stdint.h>
  25
  26 /**
  27  * Get the current time in microseconds.
  28  */
  29 int64_t av_gettime(void);
  30
  31 /**
  32  * Get the current time in microseconds since some unspecified starting point.
  33  * On platforms that support it, the time comes from a monotonic clock
  34  * This property makes this time source ideal for measuring relative time.
  35  * The returned values may not be monotonic on platforms where a monotonic
  36  * clock is not available.
  37  */
  38 int64_t av_gettime_relative(void);
  39
  40 /**
  41  * Indicates with a boolean result if the av_gettime_relative() time source
  42  * is monotonic.
  43  */
  44 int av_gettime_relative_is_monotonic(void);
  45
  46 /**
  47  * Sleep for a period of time.  Although the duration is expressed in
  48  * microseconds, the actual delay may be rounded to the precision of the
  49  * system timer.
  50  *
  51  * @param  usec Number of microseconds to sleep.
  52  * @return zero on success or (negative) error code.
  53  */
  54 int av_usleep(unsigned usec);
  55
  56 #endif /* AVUTIL_TIME_H */