-kludge to have less discontinuity after a zero scr in DVD.

Maybe we should try to predict the date instead of taking the last one but
it seems quite hard.

include/input_ext-intf.h

@@ -4,7 +4,7 @@
  * control the pace of reading. 
  *****************************************************************************
  * Copyright (C) 1999, 2000 VideoLAN
- * $Id: input_ext-intf.h,v 1.44 2001/10/02 16:46:59 massiot Exp $
+ * $Id: input_ext-intf.h,v 1.45 2001/11/08 14:45:44 stef Exp $
  *
  * Authors: Christophe Massiot <massiot@via.ecp.fr>
  *
@@ -122,6 +122,7 @@ typedef struct pgrm_descriptor_s
     mtime_t                 cr_ref, sysdate_ref;
     mtime_t                 last_cr; /* reference to detect unexpected stream
                                       * discontinuities                      */
+    mtime_t                 last_syscr;
     count_t                 c_average_count;
                            /* counter used to compute dynamic average values */
     int                     i_synchro_state;

src/input/input_clock.c

@@ -2,7 +2,7 @@
  * input_clock.c: Clock/System date convertions, stream management
  *****************************************************************************
  * Copyright (C) 1999, 2000 VideoLAN
- * $Id: input_clock.c,v 1.22 2001/09/05 16:07:50 massiot Exp $
+ * $Id: input_clock.c,v 1.23 2001/11/08 14:45:44 stef Exp $
  *
  * Authors: Christophe Massiot <massiot@via.ecp.fr>
  *
@@ -124,7 +124,12 @@ static void ClockNewRef( input_thread_t * p_input, pgrm_descriptor_t * p_pgrm,
                          mtime_t i_clock, mtime_t i_sysdate )
 {
     p_pgrm->cr_ref = i_clock;
-    p_pgrm->sysdate_ref = i_sysdate;
+    /* this is actually a kludge, but it gives better results when scr
+    * is zero in DVDs: we are 3-4 ms in advance instead of sometimes
+    * 100ms late  */
+    p_pgrm->sysdate_ref = ( p_pgrm->last_syscr && !i_clock )
+                          ? p_pgrm->last_syscr
+                          : i_sysdate ;
 }
 
 /*****************************************************************************
@@ -134,6 +139,7 @@ static void ClockNewRef( input_thread_t * p_input, pgrm_descriptor_t * p_pgrm,
 void input_ClockInit( pgrm_descriptor_t * p_pgrm )
 {
     p_pgrm->last_cr = 0;
+    p_pgrm->last_syscr = 0;
     p_pgrm->cr_ref = 0;
     p_pgrm->sysdate_ref = 0;
     p_pgrm->delta_cr = 0;
@@ -161,6 +167,7 @@ int input_ClockManageControl( input_thread_t * p_input,
         p_input->stream.control.i_status = PAUSE_S;
         vlc_cond_wait( &p_input->stream.stream_wait,
                        &p_input->stream.stream_lock );
+        p_pgrm->last_syscr = 0;
         ClockNewRef( p_input, p_pgrm, i_clock, mdate() );
 
         if( p_input->stream.i_new_status == PAUSE_S )
@@ -233,6 +240,7 @@ void input_ClockManageRef( input_thread_t * p_input,
         else
         {
             p_pgrm->last_cr = 0;
+            p_pgrm->last_syscr = 0;
             p_pgrm->delta_cr = 0;
             p_pgrm->c_average_count = 0;
         }
@@ -257,10 +265,15 @@ void input_ClockManageRef( input_thread_t * p_input,
         if( p_input->stream.b_pace_control
              && p_input->stream.pp_programs[0] == p_pgrm )
         {
+            /* We remember the last system date to be able to restart
+             * the synchro we statistically better continuity, after 
+             * a zero scr */
+            p_pgrm->last_syscr = ClockToSysdate( p_input, p_pgrm, i_clock );
+            
             /* Wait a while before delivering the packets to the decoder.
              * In case of multiple programs, we arbitrarily follow the
              * clock of the first program. */
-            mwait( ClockToSysdate( p_input, p_pgrm, i_clock ) );
+            mwait( p_pgrm->last_syscr );
 
             /* Now take into account interface changes. */
             input_ClockManageControl( p_input, p_pgrm, i_clock );