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systemclock: Fix clock time conversion on Windows/xbox

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The returned ratio can be bigger than GST_SECOND, in which case we would
forever return 0 for the system clock time. Even in other cases if it's
close to GST_SECOND it would result in accuracy loss.

Instead of doing the division by GST_CLOCK_TIME_NONE during
initialization once, do it every time the clock time is requested.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/575

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/534>
This commit is contained in:
Roman Shpuntov 2020-06-18 15:52:40 +07:00 committed by Sebastian Dröge
parent 31e6d766ff
commit fd280c0981
1 changed files with 2 additions and 6 deletions
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8
gst/gstsystemclock.c
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@ -352,7 +352,6 @@ struct _GstSystemClockPrivate
#ifdef G_OS_WIN32
LARGE_INTEGER frequency;
guint64 ratio;
#endif /* G_OS_WIN32 */
#ifdef __APPLE__
struct mach_timebase_info mach_timebase;
@ -453,10 +452,6 @@ gst_system_clock_init (GstSystemClock * clock)
#ifdef G_OS_WIN32
QueryPerformanceFrequency (&priv->frequency);
/* can be 0 if the hardware does not have hardware support */
if (priv->frequency.QuadPart != 0) {
priv->ratio = GST_SECOND / priv->frequency.QuadPart;
}
#endif /* G_OS_WIN32 */
#ifdef __APPLE__
@ -845,7 +840,8 @@ gst_system_clock_get_internal_time (GstClock * clock)
/* we prefer the highly accurate performance counters on windows */
QueryPerformanceCounter (&now);
return now.QuadPart * sysclock->priv->ratio;
return gst_util_uint64_scale (now.QuadPart,
GST_SECOND, sysclock->priv->frequency.QuadPart);
} else
#endif /* G_OS_WIN32 */
#if !defined HAVE_POSIX_TIMERS || !defined HAVE_CLOCK_GETTIME