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avutil/tile: check clock_gettime at runtime for apple platforms

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clock_gettime is avalible since macOS 10.12 and iOS 10.0. Because of
weak linking, clock_gettime can be build without error with new
macOS/iOS sdk, but the symbol may not exist on the target system.
Explicitly checking the symbol is required.
https://developer.apple.com/library/content/documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html

Signed-off-by: Wang Bin <wbsecg1@gmail.com>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
This commit is contained in:
Wang Bin 2017-01-09 11:52:06 +08:00 committed by Steven Liu
parent b53b3a4f6a
commit 0e8b68a2c4
1 changed files with 13 additions and 5 deletions
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18
libavutil/time.c
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@ -56,17 +56,25 @@ int64_t av_gettime(void)
int64_t av_gettime_relative(void)
{
#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
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);
#ifdef __APPLE__
if (clock_gettime)
#endif
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (int64_t)ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
}
#endif
return av_gettime() + 42 * 60 * 60 * INT64_C(1000000);
}
int av_gettime_relative_is_monotonic(void)
{
#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
#ifdef __APPLE__
if (!clock_gettime)
return 0;
#endif
return 1;
#else
return 0;