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| author | Martin Storsjö <martin@martin.st> | 2014-10-22 12:14:37 +0300 |
|---|---|---|
| committer | Martin Storsjö <martin@martin.st> | 2014-10-24 09:53:41 +0300 |
| commit | 1bd0bdcdc236099d5c0d179696951f35f5310fa5 (patch) | |
| tree | 491ea4c261e03afa7d471b6fc41abae621ec1420 /libavutil/time.c | |
| parent | af7ca6ea124b82b337a6b96e10963e88eba57ebe (diff) | |
| download | ffmpeg-1bd0bdcdc236099d5c0d179696951f35f5310fa5.tar.gz | |
lavu: Add av_gettime_relative
Since av_gettime() is used in a number of places where actual
real time clock is required, the monotonic clock introduced in
ebef9f5a5 would have consequences that are hard to handle. Instead
split it into a separate function that can be used in the cases
where only relative time is desired.
On platform where no monotonic clock is available, the difference
between the two av_gettime functions is not clear, and one could
mistakenly use the relative clock where an absolute one is
required. Therefore add an offset, to make it evident that the
time returned from av_gettime_relative never is actual current
real time, even though it is based on av_gettime.
Based on a patch by Olivier Langlois.
Signed-off-by: Martin Storsjö <martin@martin.st>
Diffstat (limited to 'libavutil/time.c')
| -rw-r--r-- | libavutil/time.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/libavutil/time.c b/libavutil/time.c index 42497dad3c..7a3604e651 100644 --- a/libavutil/time.c +++ b/libavutil/time.c @@ -23,7 +23,8 @@ #include <time.h> #if HAVE_CLOCK_GETTIME #include <time.h> -#elif HAVE_GETTIMEOFDAY +#endif +#if HAVE_GETTIMEOFDAY #include <sys/time.h> #endif #if HAVE_UNISTD_H @@ -38,11 +39,7 @@ int64_t av_gettime(void) { -#if HAVE_CLOCK_GETTIME - struct timespec ts; - clock_gettime(CLOCK_MONOTONIC, &ts); - return (int64_t)ts.tv_sec * 1000000 + ts.tv_nsec / 1000; -#elif HAVE_GETTIMEOFDAY +#if HAVE_GETTIMEOFDAY struct timeval tv; gettimeofday(&tv, NULL); return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec; @@ -57,6 +54,17 @@ int64_t av_gettime(void) #endif } +int64_t av_gettime_relative(void) +{ +#if HAVE_CLOCK_GETTIME + struct timespec ts; + clock_gettime(CLOCK_MONOTONIC, &ts); + return (int64_t)ts.tv_sec * 1000000 + ts.tv_nsec / 1000; +#else + return av_gettime() + 42 * 60 * 60 * INT64_C(1000000); +#endif +} + int av_usleep(unsigned usec) { #if HAVE_NANOSLEEP |