core playlist: refactor & fix #3737

src/playlist/item.c

@@ -90,21 +90,22 @@ static void input_item_add_subitem_tree ( const vlc_event_t * p_event,
         }
         p_up = p_up->p_parent;
     }
+
     if( b_flat )
-    {
         playlist_DeleteItem( p_playlist, p_item, true );
-        p_item = playlist_InsertInputItemTree( p_playlist, p_parent,
-                                               p_new_root, pos, true );
-    }
-    else
-        p_item = playlist_InsertInputItemTree( p_playlist, p_item,
-                                               p_new_root, PLAYLIST_END, false );
+
+    p_item = playlist_InsertInputItemTree( p_playlist,
+                                           b_flat ? p_parent : p_item,
+                                           p_new_root,
+                                           b_flat ? pos: PLAYLIST_END,
+                                           b_flat );
 
     if( !b_flat ) var_SetAddress( p_playlist, "leaf-to-parent", p_input );
 
+    //control playback only if it was the current playing item that got subitems
     if( b_current )
     {
-        if( ( b_stop && !b_flat ) || !b_autostart )
+        if( !p_item || ( b_stop && !b_flat ) || !b_autostart )
         {
             PL_UNLOCK;
             playlist_Stop( p_playlist );
@@ -796,40 +797,50 @@ static int RecursiveAddIntoParent (
     input_item_node_t *p_node, int i_pos, bool b_flat,
     playlist_item_t **pp_first_leaf )
 {
+  *pp_first_leaf = NULL;
+
   if( p_parent->i_children == -1 ) ChangeToNode( p_playlist, p_parent );
 
   if( i_pos == PLAYLIST_END ) i_pos = p_parent->i_children;
 
   for( int i = 0; i < p_node->i_children; i++ )
   {
-      playlist_item_t *p_child = NULL;
-      if( b_flat ? p_node->pp_children[i]->i_children == 0 : 1 )
+      input_item_node_t *p_child_node = p_node->pp_children[i];
+
+      playlist_item_t *p_new_item = NULL;
+      bool b_children = p_child_node->i_children > 0;
+
+      //Create the playlist item represented by input node, if allowed.
+      if( !(b_flat && b_children) )
       {
-          p_child = playlist_NodeAddInput( p_playlist,
-                                 p_node->pp_children[i]->p_item,
-                                 p_parent,
-                                 PLAYLIST_INSERT, i_pos,
-                                 pl_Locked );
+          p_new_item = playlist_NodeAddInput( p_playlist,
+                                              p_child_node->p_item,
+                                              p_parent,
+                                              PLAYLIST_INSERT, i_pos,
+                                              pl_Locked );
+          if( !p_new_item ) return i_pos;
+
           i_pos++;
+
+          //Swap parent for new item, if we will recurse
+          if( b_children ) p_parent = p_new_item;
       }
-      if( p_node->pp_children[i]->i_children > 0 )
+      //Recurse if any children
+      if( b_children )
       {
-          if( b_flat )
-          {
-              i_pos = RecursiveAddIntoParent(
-                                      p_playlist, p_parent,
-                                      p_node->pp_children[i], i_pos, true,
-                                      &p_child );
-          }
-          else
-          {
-              RecursiveAddIntoParent( p_playlist, p_child,
-                                      p_node->pp_children[i], 0, false,
-                                      &p_child );
-          }
+          //Substitute p_new_item for first child leaf
+          //(If flat, continue counting from current position)
+          int i_last_pos = RecursiveAddIntoParent(
+                                      p_playlist, p_parent, p_child_node,
+                                      ( b_flat ? i_pos : 0 ),
+                                      b_flat,
+                                      &p_new_item );
+          //If flat, take position after recursion as current position
+          if( b_flat ) i_pos = i_last_pos;
       }
-      assert( p_child != NULL );
-      if( i == 0 ) *pp_first_leaf = p_child;
+
+      assert( p_new_item != NULL );
+      if( i == 0 ) *pp_first_leaf = p_new_item;
   }
   return i_pos;
 }