<!-- ##### SECTION Title ##### --> GstSystemClock <!-- ##### SECTION Short_Description ##### --> A default clock that uses the current system time <!-- ##### SECTION Long_Description ##### --> <para> The System clock is an implementation of GstClock using the system time. </para> <!-- ##### SECTION See_Also ##### --> <para> #GstClock </para> <!-- ##### FUNCTION gst_system_clock_obtain ##### --> <para> </para> @Returns: