+ if( i_cr_average < 10 )
+ i_cr_average = 10;
+
+ if( cl->drift.i_divider != i_cr_average )
+ AvgRescale( &cl->drift, i_cr_average );
+
+ vlc_mutex_unlock( &cl->lock );
+}
+
+mtime_t input_clock_GetJitter( input_clock_t *cl )
+{
+ vlc_mutex_lock( &cl->lock );
+
+#if INPUT_CLOCK_LATE_COUNT != 3
+# error "unsupported INPUT_CLOCK_LATE_COUNT"
+#endif
+ /* Find the median of the last late values
+ * It works pretty well at rejecting bad values
+ *
+ * XXX we only increase pts_delay over time, decreasing it is
+ * not that easy if we want to be robust.
+ */
+ const mtime_t *p = cl->late.pi_value;
+ mtime_t i_late_median = p[0] + p[1] + p[2] - __MIN(__MIN(p[0],p[1]),p[2]) - __MAX(__MAX(p[0],p[1]),p[2]);
+ mtime_t i_pts_delay = cl->i_pts_delay ;
+
+ vlc_mutex_unlock( &cl->lock );
+
+ return i_pts_delay + i_late_median;
+}
+
+/*****************************************************************************
+ * ClockStreamToSystem: converts a movie clock to system date
+ *****************************************************************************/
+static mtime_t ClockStreamToSystem( input_clock_t *cl, mtime_t i_stream )
+{
+ if( !cl->b_has_reference )
+ return VLC_TS_INVALID;
+
+ return ( i_stream - cl->ref.i_stream ) * cl->i_rate / INPUT_RATE_DEFAULT +
+ cl->ref.i_system;
+}
+
+/*****************************************************************************
+ * ClockSystemToStream: converts a system date to movie clock
+ *****************************************************************************
+ * Caution : a valid reference point is needed for this to operate.
+ *****************************************************************************/
+static mtime_t ClockSystemToStream( input_clock_t *cl, mtime_t i_system )
+{
+ assert( cl->b_has_reference );
+ return ( i_system - cl->ref.i_system ) * INPUT_RATE_DEFAULT / cl->i_rate +
+ cl->ref.i_stream;
+}
+
+/**
+ * It returns timestamp display offset due to ref/last modfied on rate changes
+ * It ensures that currently converted dates are not changed.
+ */
+static mtime_t ClockGetTsOffset( input_clock_t *cl )
+{
+ return cl->i_pts_delay * ( cl->i_rate - INPUT_RATE_DEFAULT ) / INPUT_RATE_DEFAULT;