+int input_clock_GetState( input_clock_t *cl,
+ mtime_t *pi_stream_start, mtime_t *pi_system_start,
+ mtime_t *pi_stream_duration, mtime_t *pi_system_duration )
+{
+ vlc_mutex_lock( &cl->lock );
+
+ if( !cl->b_has_reference )
+ {
+ vlc_mutex_unlock( &cl->lock );
+ return VLC_EGENERIC;
+ }
+
+ *pi_stream_start = cl->ref.i_stream;
+ *pi_system_start = cl->ref.i_system;
+
+ *pi_stream_duration = cl->last.i_stream - cl->ref.i_stream;
+ *pi_system_duration = cl->last.i_system - cl->ref.i_system;
+
+ vlc_mutex_unlock( &cl->lock );
+
+ return VLC_SUCCESS;
+}
+
+void input_clock_ChangeSystemOrigin( input_clock_t *cl, mtime_t i_system )
+{
+ vlc_mutex_lock( &cl->lock );
+
+ assert( cl->b_has_reference );
+ const mtime_t i_offset = i_system - cl->ref.i_system - ClockGetTsOffset( cl );
+
+ cl->ref.i_system += i_offset;
+ cl->last.i_system += i_offset;
+
+ vlc_mutex_unlock( &cl->lock );
+}
+
+#warning "input_clock_SetJitter needs more work"
+void input_clock_SetJitter( input_clock_t *cl,
+ mtime_t i_pts_delay, int i_cr_average )
+{
+ vlc_mutex_lock( &cl->lock );
+
+ /* Update late observations */
+ const mtime_t i_delay_delta = i_pts_delay - cl->i_pts_delay;
+ mtime_t pi_late[INPUT_CLOCK_LATE_COUNT];
+ for( int i = 0; i < INPUT_CLOCK_LATE_COUNT; i++ )
+ pi_late[i] = __MAX( cl->late.pi_value[(cl->late.i_index + 1 + i)%INPUT_CLOCK_LATE_COUNT] - i_delay_delta, 0 );
+
+ for( int i = 0; i < INPUT_CLOCK_LATE_COUNT; i++ )
+ cl->late.pi_value[i] = 0;
+ cl->late.i_index = 0;
+
+ for( int i = 0; i < INPUT_CLOCK_LATE_COUNT; i++ )
+ {
+ if( pi_late[i] <= 0 )
+ continue;
+ cl->late.pi_value[cl->late.i_index] = pi_late[i];
+ cl->late.i_index = ( cl->late.i_index + 1 ) % INPUT_CLOCK_LATE_COUNT;
+ }
+
+ /* TODO always save the value, and when rebuffering use the new one if smaller
+ * TODO when increasing -> force rebuffering
+ */
+ if( cl->i_pts_delay < i_pts_delay )
+ cl->i_pts_delay = i_pts_delay;
+
+ /* */
+ 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;
+}
+
+/*****************************************************************************
+ * Long term average helpers
+ *****************************************************************************/
+static void AvgInit( average_t *p_avg, int i_divider )
+{
+ p_avg->i_divider = i_divider;
+ AvgReset( p_avg );
+}
+static void AvgClean( average_t *p_avg )
+{
+ VLC_UNUSED(p_avg);
+}
+static void AvgReset( average_t *p_avg )
+{
+ p_avg->i_value = 0;
+ p_avg->i_residue = 0;
+ p_avg->i_count = 0;
+}
+static void AvgUpdate( average_t *p_avg, mtime_t i_value )
+{
+ const int i_f0 = __MIN( p_avg->i_divider - 1, p_avg->i_count );
+ const int i_f1 = p_avg->i_divider - i_f0;
+
+ const mtime_t i_tmp = i_f0 * p_avg->i_value + i_f1 * i_value + p_avg->i_residue;
+
+ p_avg->i_value = i_tmp / p_avg->i_divider;
+ p_avg->i_residue = i_tmp % p_avg->i_divider;
+
+ p_avg->i_count++;
+}
+static mtime_t AvgGet( average_t *p_avg )
+{
+ return p_avg->i_value;
+}
+static void AvgRescale( average_t *p_avg, int i_divider )
+{
+ const mtime_t i_tmp = p_avg->i_value * p_avg->i_divider + p_avg->i_residue;
+
+ p_avg->i_divider = i_divider;
+ p_avg->i_value = i_tmp / p_avg->i_divider;
+ p_avg->i_residue = i_tmp % p_avg->i_divider;
+}