* src/playlist/playlist.c: Don't do any playlist actions if there are no items in the playlist.

 * REST: remove code duplication in some places. there might be more locations.

modules/control/hotkeys.c

@@ -294,15 +294,10 @@ static void Run( intf_thread_t *p_intf )
                                           FIND_ANYWHERE );
             if( p_playlist )
             {
-                vlc_mutex_lock( &p_playlist->object_lock );
-                if( p_playlist->i_size )
-                {
-                    vlc_mutex_unlock( &p_playlist->object_lock );
                 playlist_Play( p_playlist );
                 vlc_object_release( p_playlist );
             }
         }
-        }
         else if( i_action == ACTIONID_PLAY_PAUSE )
         {
             val.i_int = PLAYING_S;

modules/gui/macosx/intf.m

@@ -487,19 +487,18 @@ unsigned int VLCModifiersToCocoa( unsigned int i_key )
     [self setSubmenusEnabled: FALSE];
     [self manageVolumeSlider];
     
-    /* Check if we need to start playing */
-    if( p_intf->b_play )
-    {
     p_playlist = (playlist_t *) vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST, FIND_ANYWHERE );
 
     if( p_playlist )
+    {
+        /* Check if we need to start playing */
+        if( p_intf->b_play )
         {
             playlist_Play( p_playlist );
-            vlc_object_release( p_playlist );
-        }
         }
-    
         [o_btn_fullscreen setState: ( var_Get( p_playlist, "fullscreen", &val )>=0 && val.b_bool )];
+        vlc_object_release( p_playlist );
+    }
 }
 
 - (void)initStrings

modules/gui/wxwindows/wxwindows.cpp

@@ -317,16 +317,7 @@ bool Instance::OnInit()
                                            FIND_ANYWHERE );
         if( p_playlist )
         {
-            vlc_mutex_lock( &p_playlist->object_lock );
-            if( p_playlist->i_size )
-            {
-                vlc_mutex_unlock( &p_playlist->object_lock );
             playlist_Play( p_playlist );
-            }
-            else
-            {
-                vlc_mutex_unlock( &p_playlist->object_lock );
-            }
             vlc_object_release( p_playlist );
         }
     }

src/playlist/playlist.c

@@ -156,8 +156,9 @@ void playlist_Destroy( playlist_t * p_playlist )
 
 
 /**
- * Do a playlist action
+ * Do a playlist action.
  *
+ * If there is something in the playlist then you can do playlist actions.
  * \param p_playlist the playlist to do the command on
  * \param i_command the command to do
  * \param i_arg the argument to the command. See playlist_command_t for details
@@ -169,6 +170,12 @@ void playlist_Command( playlist_t * p_playlist, playlist_command_t i_command,
 
     vlc_mutex_lock( &p_playlist->object_lock );
 
+    if( p_playlist->i_size <= 0 )
+    {
+        vlc_mutex_unlock( &p_playlist->object_lock );
+        return;
+    }
+
     switch( i_command )
     {
     case PLAYLIST_STOP: