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

Saves a lot of computations.

diff --git a/gst/gstsystemclock.c b/gst/gstsystemclock.c
index 508ef21..c5260f2 100644 (file)
--- a/gst/gstsystemclock.c
+++ b/gst/gstsystemclock.c
@@ -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