From 23c9d1b7324a7f22f8a31ae684f755bf0ff3db48 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 25 Jun 2021 18:11:38 +0200
Subject: [PATCH] AU: Support loading sessions using numeric AU IDs

---
 libs/ardour/plugin.cc | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/libs/ardour/plugin.cc b/libs/ardour/plugin.cc
index f075674ad6..7c57c2a22d 100644
--- a/libs/ardour/plugin.cc
+++ b/libs/ardour/plugin.cc
@@ -271,6 +271,18 @@ ARDOUR::find_plugin(Session& session, string identifier, PluginType type)
 	}
 #endif
 
+#ifdef AUDIOUNIT_SUPPORT
+	if (type == ARDOUR::AudioUnit) {
+		/* old versions saved three 32bit (really OSType) integers
+		 * e.g. 112233-445566-778899 (due to stringstream misinterpreting OSType)
+		 * instead of using Apple's UTCreateStringForOSType, which results in
+		 * "aaaa - bbbb - cccc"
+		 */
+		identifier = AUPluginInfo::convert_old_unique_id (identifier);
+		for (i = plugs.begin(); i != plugs.end(); ++i) {
+			if (identifier == (*i)->unique_id){
+				return (*i)->load (session);
+			}
 #ifdef LXVST_SUPPORT
 	/* hmm, we didn't find it. could be because in older versions of Ardour.
 	   we used to store the name of a VST plugin, not its unique ID. so try
@@ -282,6 +294,7 @@ ARDOUR::find_plugin(Session& session, string identifier, PluginType type)
 			return (*i)->load (session);
 		}
 	}
+
 #endif
 
 	return PluginPtr ();