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systemclock: pre-calculate the ratio for multiplying the perf-count on win

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Saves a lot of computations.
This commit is contained in:
Havard Graff 2018-09-20 01:42:48 -07:00 committed by Havard Graff
parent 4b3872f757
commit c6e5f59b2c
1 changed files with 3 additions and 2 deletions
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5
gst/gstsystemclock.c
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@ -89,6 +89,7 @@ struct _GstSystemClockPrivate
#ifdef G_OS_WIN32
LARGE_INTEGER start;
LARGE_INTEGER frequency;
guint64 ratio;
#endif /* G_OS_WIN32 */
#ifdef __APPLE__
struct mach_timebase_info mach_timebase;
@ -195,6 +196,7 @@ gst_system_clock_init (GstSystemClock * clock)
if (priv->frequency.QuadPart != 0)
/* we take a base time so that time starts from 0 to ease debugging */
QueryPerformanceCounter (&priv->start);
priv->ratio = GST_SECOND / priv->frequency.QuadPart;
#endif /* G_OS_WIN32 */
#ifdef __APPLE__
@ -580,8 +582,7 @@ gst_system_clock_get_internal_time (GstClock * clock)
/* we prefer the highly accurate performance counters on windows */
QueryPerformanceCounter (&now);
return gst_util_uint64_scale (now.QuadPart - sysclock->priv->start.QuadPart,
GST_SECOND, sysclock->priv->frequency.QuadPart);
return ((now.QuadPart - sysclock->priv->start.QuadPart) * sysclock->priv->ratio);
} else
#endif /* G_OS_WIN32 */
#if !defined HAVE_POSIX_TIMERS || !defined HAVE_CLOCK_GETTIME