Create sidechain ports when created from template (#0007680)

When a route with a sidechain is created from a template or by route
duplication the number of ports of the sidechain are set according to the
XMLNode defining the sidechain. Then the names are set according to the name of
the newly created route.

Thus all the pin connections defined in the template are replicated in the
newly created route.

3 files changed, 46 insertions, 2 deletions

diff --git a/libs/ardour/ardour/plugin_insert.h b/libs/ardour/ardour/plugin_insert.h
index a68110177f..0a56373972 100644
--- a/libs/ardour/ardour/plugin_insert.h
+++ b/libs/ardour/ardour/plugin_insert.h
@@ -388,6 +388,8 @@ private:
 	boost::shared_ptr<Plugin> plugin_factory (boost::shared_ptr<Plugin>);
 	void add_plugin (boost::shared_ptr<Plugin>);
 
+	void add_sidechain_from_xml (const XMLNode& node, int version);
+
 	void start_touch (uint32_t param_id);
 	void end_touch (uint32_t param_id);
 
diff --git a/libs/ardour/ardour/sidechain.h b/libs/ardour/ardour/sidechain.h
index dd608c8951..1677360990 100644
--- a/libs/ardour/ardour/sidechain.h
+++ b/libs/ardour/ardour/sidechain.h
@@ -39,7 +39,7 @@ public:
 	bool can_support_io_configuration (const ChanCount& in, ChanCount& out);
 	bool configure_io (ChanCount in, ChanCount out);
 
-	int  set_state(const XMLNode&, int version);
+	int set_state(const XMLNode&, int version);
 
 protected:
 	XMLNode& state ();
diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index 4fc97fb0c8..983d3b9aa8 100644
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -2763,10 +2763,16 @@ PluginInsert::set_state(const XMLNode& node, int version)
 		// sidechain is a Processor (IO)
 		if ((*i)->name () ==  Processor::state_node_name) {
 			if (!_sidechain) {
-				add_sidechain (0);
+				if (regenerate_xml_or_string_ids ()) {
+					add_sidechain_from_xml (**i, version);
+				} else {
+					add_sidechain (0);
+				}
 			}
 			if (!regenerate_xml_or_string_ids ()) {
 				_sidechain->set_state (**i, version);
+			} else {
+				update_sidechain_name ();
 			}
 		}
 	}
@@ -3096,6 +3102,42 @@ PluginInsert::add_plugin (boost::shared_ptr<Plugin> plugin)
 	_plugins.push_back (plugin);
 }
 
+void
+PluginInsert::add_sidechain_from_xml (const XMLNode& node, int version)
+{
+	if (version < 3000) {
+		return;
+	}
+
+	XMLNodeList nlist = node.children();
+
+	if (nlist.size() == 0) {
+		return;
+	}
+
+	uint32_t audio = 0;
+	uint32_t midi = 0;
+
+	XMLNodeConstIterator it = nlist.front()->children().begin();
+	for ( ; it != nlist.front()->children().end(); ++ it) {
+		if ((*it)->name() == "Port") {
+			DataType type(DataType::NIL);
+			(*it)->get_property ("type", type);
+			if (type == DataType::AUDIO) {
+				++audio;
+			} else if (type == DataType::MIDI) {
+				++midi;
+			}
+		}
+	}
+
+	ChanCount in_cc = ChanCount();
+	in_cc.set (DataType::AUDIO, audio);
+	in_cc.set (DataType::MIDI, midi);
+
+	add_sidechain (audio, midi);
+}
+
 bool
 PluginInsert::load_preset (ARDOUR::Plugin::PresetRecord pr)
 {