From 0eebc8b8948edf4ec5c038119784767d5b229a52 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 24 Sep 2019 19:48:31 +0200
Subject: Prepare for plugin-control groups

This is in preparation to allow groups of "well known" controls,
the parameter ID of which is not known a-priori.
---
 libs/ardour/control_group.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'libs/ardour/control_group.cc')

diff --git a/libs/ardour/control_group.cc b/libs/ardour/control_group.cc
index 7a984e4e17..f3677c1af5 100644
--- a/libs/ardour/control_group.cc
+++ b/libs/ardour/control_group.cc
@@ -128,7 +128,14 @@ int
 ControlGroup::add_control (boost::shared_ptr<AutomationControl> ac)
 {
 	if (ac->parameter() != _parameter) {
-		return -1;
+		if (_parameter.type () != PluginAutomation) {
+			return -1;
+		}
+		/* allow plugin-automation - first control sets Evoral::parameter */
+		Glib::Threads::RWLock::ReaderLock lm (controls_lock);
+		if (!_controls.empty () && _controls.begin()->second->parameter() != ac->parameter()) {
+			return -1;
+		}
 	}
 
 	std::pair<ControlMap::iterator,bool> res;
-- 
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