From f795462100cd0a16b86ffa7e07edeb166dc53abd Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Thu, 22 Nov 2018 14:58:44 +0100
Subject: [PATCH] Save LV2 Port Property values locally

This keeps track of lv2:Parameter properties modified with Port:Set,
currently file-paths.
---
 libs/ardour/ardour/lv2_plugin.h |  3 +++
 libs/ardour/lv2_plugin.cc       | 11 +++++++++++
 2 files changed, 14 insertions(+)

diff --git a/libs/ardour/ardour/lv2_plugin.h b/libs/ardour/ardour/lv2_plugin.h
index f12953633b..75d07547ef 100644
--- a/libs/ardour/ardour/lv2_plugin.h
+++ b/libs/ardour/ardour/lv2_plugin.h
@@ -172,6 +172,7 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
 	void                       set_property(uint32_t key, const Variant& value);
 	const PropertyDescriptors& get_supported_properties() const { return _property_descriptors; }
 	const ParameterDescriptor& get_property_descriptor(uint32_t id) const;
+	Variant                    get_property_value (uint32_t) const;
 	void                       announce_property_values();
 
   private:
@@ -231,6 +232,8 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
 	std::vector<size_t>            _port_minimumSize;
 	std::map<std::string,uint32_t> _port_indices;
 
+	std::map<uint32_t, Variant>    _property_values;
+
 	PropertyDescriptors _property_descriptors;
 
 	struct AutomationCtrl {
diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 3ae3140577..79bef11cdd 100644
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -1992,6 +1992,16 @@ LV2Plugin::load_supported_properties(PropertyDescriptors& descs)
 	lilv_nodes_free(properties);
 }
 
+Variant
+LV2Plugin::get_property_value (uint32_t prop_id) const
+{
+	std::map<uint32_t, Variant>::const_iterator it;
+	if ((it = _property_values.find (prop_id)) == _property_values.end()) {
+		return Variant();
+	}
+	return it->second;
+}
+
 void
 LV2Plugin::announce_property_values()
 {
@@ -2944,6 +2954,7 @@ LV2Plugin::connect_and_run(BufferSet& bufs,
 								// Emit PropertyChanged signal for UI
 								// TODO: This should emit the control's Changed signal
 								PropertyChanged(prop_id, Variant(Variant::PATH, path));
+								_property_values[prop_id] = Variant(Variant::PATH, path);
 							} else {
 								std::cerr << "warning: patch:Set for unknown property" << std::endl;
 							}