playlist: Listen to vlc_InputItemMetaChanged. This removes one more playlist->vout dependency.

This could trigger some interface bugs, especially if they handle their callbacks carelessly. Revert if you have issues, but also consider to fix your interface.

src/input/input.c

@@ -2124,8 +2124,6 @@ static int UpdateFromAccess( input_thread_t *p_input )
         vlc_meta_t *p_meta = vlc_meta_New();
         access_Control( p_input->p->input.p_access,ACCESS_GET_META, p_meta );
         InputUpdateMeta( p_input, p_meta );
-        var_SetInteger( libvlc_priv (p_input->p_libvlc)->p_playlist,
-                        "item-change", p_input->p->input.p_item->i_id );
         p_access->info.i_update &= ~INPUT_UPDATE_META;
     }
 

src/playlist/item.c

@@ -106,6 +106,17 @@ static void input_item_subitem_added( const vlc_event_t * p_event,
 
 }
 
+/*****************************************************************************
+ * An input item's meta has changed (Event Callback)
+ *****************************************************************************/
+static void input_item_meta_changed( const vlc_event_t * p_event,
+                                      void * user_data )
+{
+    playlist_item_t * p_item = user_data;
+    var_SetInteger( p_item->p_playlist,
+                    "item-change", p_item->i_id );
+}
+
 /*****************************************************************************
  * Listen to vlc_InputItemAddSubItem event
  *****************************************************************************/
@@ -115,15 +126,22 @@ static void install_input_item_observer( playlist_item_t * p_item )
                       vlc_InputItemSubItemAdded,
                       input_item_subitem_added,
                       p_item );
+    vlc_event_attach( &p_item->p_input->event_manager,
+                      vlc_InputItemMetaChanged,
+                      input_item_meta_changed,
+                      p_item );
 }
 
 static void uninstall_input_item_observer( playlist_item_t * p_item )
 {
+    vlc_event_detach( &p_item->p_input->event_manager,
+                      vlc_InputItemMetaChanged,
+                      input_item_meta_changed,
+                      p_item );
     vlc_event_detach( &p_item->p_input->event_manager,
                       vlc_InputItemSubItemAdded,
                       input_item_subitem_added,
                       p_item );
-
 }
 
 /*****************************************************************************