[Bug 740557] videotestsrc: add ball motion based on system clock

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740557
  GStreamer | gst-plugins-base | git

--- Comment #14 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-11-29 19:27:59 UTC ---
So you want the wallclock time? No, gst_util_get_timestamp() does not give you
that... I'm surprised it's only 1/2s off for you and not a completely different
number.

Why do you want the wallclock time here? For the sweep it might make sense to
use the current running time of the element maybe. You can get that by using
the normal synchronization formula:
gst_clock_get_time(gst_element_get_clock(element)) -
gst_element_get_base_time(element)  (plus correct reference counting, handling
of no clock or base time)

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