[vlc-commits] input_clock: add the ability to drive the main_clock

[Thomas Guillem]

vlc | branch: master | Thomas Guillem <thomas at gllm.fr> | Wed Mar 31 14:38:49 2021 +0200| [abd8991d8e22ef3a3629259cd4442b168e264eda] | committer: Thomas Guillem

input_clock: add the ability to drive the main_clock

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=abd8991d8e22ef3a3629259cd4442b168e264eda
---

 src/clock/input_clock.c | 35 ++++++++++++++++++++++++++++++++++-
 src/clock/input_clock.h |  7 ++++++-
 src/input/es_out.c      |  2 +-
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/src/clock/input_clock.c b/src/clock/input_clock.c
index f09e0bbb8f..a8e10aa36b 100644
--- a/src/clock/input_clock.c
+++ b/src/clock/input_clock.c
@@ -104,6 +104,8 @@
 /* */
 struct input_clock_t
 {
+    vlc_clock_t *clock_listener;
+
     /* Last point
      * It is used to detect unexpected stream discontinuities */
     clock_point_t last;
@@ -142,14 +144,32 @@ static vlc_tick_t ClockSystemToStream( input_clock_t *, vlc_tick_t i_system );
 
 static vlc_tick_t ClockGetTsOffset( input_clock_t * );
 
+static void UpdateListener( input_clock_t *cl )
+{
+    if( cl->clock_listener )
+    {
+        const vlc_tick_t system_expected =
+            ClockStreamToSystem( cl, cl->last.stream + AvgGet( &cl->drift ) ) +
+            cl->i_pts_delay + ClockGetTsOffset( cl );
+
+        vlc_clock_Update( cl->clock_listener, system_expected, cl->last.stream, cl->rate );
+    }
+}
+
 /*****************************************************************************
  * input_clock_New: create a new clock
  *****************************************************************************/
-input_clock_t *input_clock_New( float rate )
+input_clock_t *input_clock_New( vlc_clock_t *clock_listener, float rate )
 {
     input_clock_t *cl = malloc( sizeof(*cl) );
     if( !cl )
+    {
+        if( cl->clock_listener )
+            vlc_clock_Delete( cl->clock_listener );
         return NULL;
+    }
+
+    cl->clock_listener = clock_listener;
 
     cl->b_has_reference = false;
     cl->ref = clock_point_Create( VLC_TICK_INVALID, VLC_TICK_INVALID );
@@ -180,6 +200,8 @@ input_clock_t *input_clock_New( float rate )
 void input_clock_Delete( input_clock_t *cl )
 {
     AvgClean( &cl->drift );
+    if( cl->clock_listener )
+        vlc_clock_Delete( cl->clock_listener );
     free( cl );
 }
 
@@ -271,6 +293,8 @@ vlc_tick_t input_clock_Update( input_clock_t *cl, vlc_object_t *p_log,
         cl->late.i_index = ( cl->late.i_index + 1 ) % INPUT_CLOCK_LATE_COUNT;
     }
 
+    UpdateListener( cl );
+
     return i_late;
 }
 
@@ -282,6 +306,9 @@ void input_clock_Reset( input_clock_t *cl )
     cl->b_has_reference = false;
     cl->ref = clock_point_Create( VLC_TICK_INVALID, VLC_TICK_INVALID );
     cl->b_has_external_clock = false;
+
+    if( cl->clock_listener )
+        vlc_clock_Reset( cl->clock_listener );
 }
 
 /*****************************************************************************
@@ -296,6 +323,8 @@ void input_clock_ChangeRate( input_clock_t *cl, float rate )
         cl->ref.system = cl->last.system - (vlc_tick_t) ((cl->last.system - cl->ref.system) / rate * cl->rate);
     }
     cl->rate = rate;
+
+    UpdateListener( cl );
 }
 
 /*****************************************************************************
@@ -313,6 +342,8 @@ void input_clock_ChangePause( input_clock_t *cl, bool b_paused, vlc_tick_t i_dat
         {
             cl->ref.system += i_duration;
             cl->last.system += i_duration;
+
+            UpdateListener( cl );
         }
     }
     cl->i_pause_date = i_date;
@@ -377,6 +408,8 @@ void input_clock_ChangeSystemOrigin( input_clock_t *cl, bool b_absolute, vlc_tic
 
     cl->ref.system += i_offset;
     cl->last.system += i_offset;
+
+    UpdateListener( cl );
 }
 
 void input_clock_GetSystemOrigin( input_clock_t *cl, vlc_tick_t *pi_system, vlc_tick_t *pi_delay )
diff --git a/src/clock/input_clock.h b/src/clock/input_clock.h
index f9a74f0809..531b85ac1c 100644
--- a/src/clock/input_clock.h
+++ b/src/clock/input_clock.h
@@ -26,6 +26,7 @@
 
 #include <vlc_common.h>
 #include <vlc_input.h> /* FIXME Needed for input_clock_t */
+#include "clock.h"
 
 /** @struct input_clock_t
  * This structure is used to manage clock drift and reception jitters
@@ -36,9 +37,13 @@ typedef struct input_clock_t input_clock_t;
 
 /**
  * This function creates a new input_clock_t.
+ *
+ * \param clock_listener clock created with vlc_clock_main_CreateMaster(). If
+ * valid, the input_clock_t will take ownership of this clock and drive the
+ * main clock.
  * You must use input_clock_Delete to delete it once unused.
  */
-input_clock_t *input_clock_New( float rate );
+input_clock_t *input_clock_New( vlc_clock_t *clock_listener, float rate );
 
 /**
  * This function destroys a input_clock_t created by input_clock_New.
diff --git a/src/input/es_out.c b/src/input/es_out.c
index f794beaa2b..28f11a2f20 100644
--- a/src/input/es_out.c
+++ b/src/input/es_out.c
@@ -1411,7 +1411,7 @@ static es_out_pgrm_t *EsOutProgramAdd( es_out_t *out, input_source_t *source, in
     p_pgrm->p_meta = NULL;
 
     p_pgrm->p_master_clock = NULL;
-    p_pgrm->p_input_clock = input_clock_New( p_sys->rate );
+    p_pgrm->p_input_clock = input_clock_New( NULL, p_sys->rate );
     p_pgrm->p_main_clock = vlc_clock_main_New();
     if( !p_pgrm->p_input_clock || !p_pgrm->p_main_clock )
     {