libvlc: add a libvlc_media_parse_flag_t to interact with the user

include/vlc/libvlc_media.h

@@ -265,6 +265,12 @@ typedef enum libvlc_media_parse_flag_t
      * Fetch meta and covert art using network resources
      */
     libvlc_media_fetch_network  = 0x04,
+    /**
+     * Interact with the user (via libvlc_dialog_cbs) when preparsing this item
+     * (and not its sub items). Set this flag in order to receive a callback
+     * when the input is asking for credentials.
+     */
+    libvlc_media_do_interact    = 0x08,
 } libvlc_media_parse_flag_t;
 
 /**

lib/media.c

@@ -741,6 +741,8 @@ static int media_parse(libvlc_media_t *media, bool b_async,
 
         if (parse_flag & libvlc_media_parse_network)
             parse_scope |= META_REQUEST_OPTION_SCOPE_NETWORK;
+        if (parse_flag & libvlc_media_do_interact)
+            parse_scope |= META_REQUEST_OPTION_DO_INTERACT;
         ret = libvlc_MetaRequest(libvlc, item, parse_scope);
         if (ret != VLC_SUCCESS)
             return ret;