input: add on_attachments_added event to the parser

include/vlc_input_item.h

@@ -444,6 +444,23 @@ typedef struct input_item_parser_cbs_t
      * @param userdata user data set by input_item_Parse()
      */
     void (*on_subtree_added)(input_item_t *item, input_item_node_t *subtree, void *userdata);
+
+    /**
+     * Event received when new attachments are added
+     *
+     * @note This callback is optional. It can be called several times for one
+     * parse request. The array contains only new elements after a second call.
+     *
+     * @param item the parsed item
+     * @param array valid array containing new elements, should only be used
+     * within the callback. One and all elements can be held and stored on a
+     * new variable or new array.
+     * @param count number of elements in the array
+     * @param userdata user data set by input_item_Parse()
+     */
+    void (*on_attachments_added)(input_item_t *item,
+                                 input_attachment_t *const *array,
+                                 size_t count, void *userdata);
 } input_item_parser_cbs_t;
 
 /**

modules/gui/qt/dialogs/dialogs_provider.cpp

@@ -403,7 +403,9 @@ void DialogsProvider::mediaInfoDialog( const MLItemId& itemId )
                     }, Qt::QueuedConnection );
             },
             // on_subtree_added
-            NULL
+            NULL,
+            // on_attachments_added
+            NULL,
         };
 
         input_item_parser_id_t * const parser = input_item_Parse( inputItem, VLC_OBJECT( p_intf ), &cbs, this );

modules/misc/medialibrary/fs/directory.cpp

@@ -167,6 +167,7 @@ static bool request_metadata_sync( libvlc_int_t *libvlc, input_item_t *media,
     static const input_item_parser_cbs_t cbs = {
         onParserEnded,
         onParserSubtreeAdded,
+        nullptr,
     };
 
     auto inputParser = vlc::wrap_cptr( input_item_Parse( media, VLC_OBJECT( libvlc ), &cbs, &req ),

src/input/item.c

@@ -1414,6 +1414,13 @@ input_item_parser_InputEvent(input_thread_t *input,
                 parser->cbs->on_subtree_added(input_GetItem(input),
                                               event->subitems, parser->userdata);
             break;
+        case INPUT_EVENT_ATTACHMENTS:
+            if (parser->cbs->on_attachments_added != NULL)
+                parser->cbs->on_attachments_added(input_GetItem(input),
+                                                  event->attachments.array,
+                                                  event->attachments.count,
+                                                  parser->userdata);
+            break;
         default:
             break;
     }