[vlc-devel] commit: mtime: Use mach_absolute_time on Mac OS X instead of gettimeofday. (Pierre d'Herbemont )
git version control
git at videolan.org
Sun Feb 8 01:03:05 CET 2009
vlc | branch: 0.9-bugfix | Pierre d'Herbemont <pdherbemont at videolan.org> | Sun Feb 8 00:31:33 2009 +0100| [5ead92ffd58088828ed802173d963b2571f0cd69] | committer: Pierre d'Herbemont
mtime: Use mach_absolute_time on Mac OS X instead of gettimeofday.
mach_absolute_time() is a monotic clock, whereas gettimeofday() is not. For that reason setting your computer time while playing a movie won't halt playback anymore.
Seems to fix the dropped frame issue on Mac OS X.
> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=5ead92ffd58088828ed802173d963b2571f0cd69
---
include/vlc_threads.h | 14 ++++++++++++++
src/misc/mtime.c | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 48 insertions(+), 0 deletions(-)
diff --git a/include/vlc_threads.h b/include/vlc_threads.h
index e2810e9..8a21f84 100644
--- a/include/vlc_threads.h
+++ b/include/vlc_threads.h
@@ -359,12 +359,26 @@ static inline void __vlc_cond_wait( const char * psz_file, int i_line,
#define vlc_cond_timedwait( P_COND, P_MUTEX, DEADLINE ) \
__vlc_cond_timedwait( __FILE__, __LINE__, P_COND, P_MUTEX, DEADLINE )
+#ifdef __APPLE__
+# include <sys/time.h> /* gettimeofday in vlc_cond_timedwait */
+#endif
+
static inline int __vlc_cond_timedwait( const char * psz_file, int i_line,
vlc_cond_t *p_condvar,
vlc_mutex_t *p_mutex,
mtime_t deadline )
{
#if defined(LIBVLC_USE_PTHREAD)
+#ifdef __APPLE__
+ /* mdate() is mac_absolute_time on osx, which we must convert to do
+ * the same base than gettimeofday() on which pthread_cond_timedwait
+ * counts on. */
+ mtime_t oldbase = mdate();
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ mtime_t newbase = (mtime_t)tv.tv_sec * 1000000 + (mtime_t) tv.tv_usec;
+ deadline = deadline - oldbase + newbase;
+#endif
lldiv_t d = lldiv( deadline, 1000000 );
struct timespec ts = { d.quot, d.rem * 1000 };
diff --git a/src/misc/mtime.c b/src/misc/mtime.c
index 6c13eac..ed65f03 100644
--- a/src/misc/mtime.c
+++ b/src/misc/mtime.c
@@ -60,6 +60,11 @@
# include <sys/time.h>
#endif
+#ifdef __APPLE__
+# include <mach/mach.h>
+# include <mach/mach_time.h>
+#endif
+
#if !defined(HAVE_STRUCT_TIMESPEC)
struct timespec
{
@@ -172,6 +177,15 @@ static inline unsigned mprec( void )
#endif
}
+#ifdef __APPLE__
+static mach_timebase_info_data_t mtime_timebase_info;
+static pthread_once_t mtime_timebase_info_once = PTHREAD_ONCE_INIT;
+static void mtime_init_timebase(void)
+{
+ mach_timebase_info(&mtime_timebase_info);
+}
+#endif
+
/**
* Return high precision date
*
@@ -197,6 +211,16 @@ mtime_t mdate( void )
#elif defined( HAVE_KERNEL_OS_H )
res = real_time_clock_usecs();
+#elif defined( __APPLE__ )
+ pthread_once(&mtime_timebase_info_once, mtime_init_timebase);
+ uint64_t date = mach_absolute_time();
+
+ /* Convert to nanoseconds */
+ date *= mtime_timebase_info.numer;
+ date /= mtime_timebase_info.denom;
+
+ /* Convert to microseconds */
+ res = date / 1000;
#elif defined( WIN32 ) || defined( UNDER_CE )
/* We don't need the real date, just the value of a high precision timer */
static mtime_t freq = INT64_C(-1);
@@ -340,6 +364,11 @@ void mwait( mtime_t date )
ts.tv_sec = d.quot; ts.tv_nsec = d.rem * 1000;
while( clock_nanosleep( CLOCK_REALTIME, 0, &ts, NULL ) == EINTR );
}
+#elif defined( __APPLE__ ) /* The version that should be used, if it was cancelable */
+ pthread_once(&mtime_timebase_info_once, mtime_init_timebase);
+ uint64_t mach_time = date * 1000 * mtime_timebase_info.denom / mtime_timebase_info.numer;
+ mach_wait_until(mach_time);
+
#else
mtime_t delay = date - mdate();
@@ -385,6 +414,11 @@ void msleep( mtime_t delay )
while( nanosleep( &ts_delay, &ts_delay ) && ( errno == EINTR ) );
+#elif defined( __APPLE__ ) /* The version that should be used, if it was cancelable */
+ pthread_once(&mtime_timebase_info_once, mtime_init_timebase);
+ uint64_t mach_time = delay * 1000 * mtime_timebase_info.denom / mtime_timebase_info.numer;
+ mach_wait_until(mach_time + mach_absolute_time());
+
#else
struct timeval tv_delay;
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