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systemclock: fall back to g_get_monotonic_time

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This allows us to cover the case where we're on some unknown system that
doesn't have a known native precision monotonic time source. Sadly this
reintroduces some of the complexity removed in previous commits.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/829>
This commit is contained in:
tyler-aicradle 2021-05-27 16:01:17 -05:00
parent 5328941632
commit ea33144147
1 changed files with 16 additions and 13 deletions
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29
gst/gstsystemclock.c
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@ -386,7 +386,7 @@ static void gst_system_clock_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstClockTime gst_system_clock_get_internal_time (GstClock * clock);
#if defined __APPLE__ || defined G_OS_WIN32
#if !defined HAVE_POSIX_TIMERS || !defined HAVE_CLOCK_GETTIME
static GstClockTime gst_system_clock_get_mono_time (GstSystemClock * clock);
static GstClockTime gst_system_clock_get_real_time ();
#endif
@ -830,13 +830,7 @@ static GstClockTime
gst_system_clock_get_internal_time (GstClock * clock)
{
GstSystemClock *sysclock = GST_SYSTEM_CLOCK_CAST (clock);
#if defined __APPLE__ || defined G_OS_WIN32
if (sysclock->priv->clock_type == GST_CLOCK_TYPE_REALTIME) {
return gst_system_clock_get_real_time ();
} else {
return gst_system_clock_get_mono_time (sysclock);
}
#elif defined HAVE_POSIX_TIMERS && defined HAVE_CLOCK_GETTIME
#if defined HAVE_POSIX_TIMERS && defined HAVE_CLOCK_GETTIME
// BSD and Linux' Posix timers and clock_gettime cover all of the different clock types
// without need for special handling so we'll use those.
clockid_t ptype;
@ -848,10 +842,16 @@ gst_system_clock_get_internal_time (GstClock * clock)
return GST_CLOCK_TIME_NONE;
return GST_TIMESPEC_TO_TIME (ts);
#endif /* __APPLE__ || G_OS_WIN32 */
#else
if (sysclock->priv->clock_type == GST_CLOCK_TYPE_REALTIME) {
return gst_system_clock_get_real_time ();
} else {
return gst_system_clock_get_mono_time (sysclock);
}
#endif /* !HAVE_POSIX_TIMERS || !HAVE_CLOCK_GETTIME */
}
#if defined __APPLE__ || defined G_OS_WIN32
#if !defined HAVE_POSIX_TIMERS || !defined HAVE_CLOCK_GETTIME
static GstClockTime
gst_system_clock_get_real_time ()
{
@ -868,6 +868,7 @@ gst_system_clock_get_mono_time (GstSystemClock * sysclock)
return gst_util_uint64_scale (mach_t, sysclock->priv->mach_timebase.numer,
sysclock->priv->mach_timebase.denom);
#else
#if defined G_OS_WIN32
if (sysclock->priv->frequency.QuadPart != 0) {
LARGE_INTEGER now;
@ -876,16 +877,18 @@ gst_system_clock_get_mono_time (GstSystemClock * sysclock)
return gst_util_uint64_scale (now.QuadPart,
GST_SECOND, sysclock->priv->frequency.QuadPart);
} else {
} else
#endif /* G_OS_WIN32 */
{
gint64 monotime;
monotime = g_get_monotonic_time ();
return monotime * 1000;
}
#endif
#endif /* __APPLE__ */
}
#endif /* __APPLE__ || G_OS_WIN32 */
#endif /* !HAVE_POSIX_TIMERS || !HAVE_CLOCK_GETTIME */
static guint64
gst_system_clock_get_resolution (GstClock * clock)