3 files changed, 34 insertions, 4 deletions
diff --git a/libs/ardour/ardour/chan_mapping.h b/libs/ardour/ardour/chan_mapping.h
index 4b0b930b02..730ecadc72 100644
--- a/libs/ardour/ardour/chan_mapping.h
+++ b/libs/ardour/ardour/chan_mapping.h
@@ -97,6 +97,20 @@ public:
 		return ! (*this == other);
 	}
 
+	ChanMapping operator+=(const ChanMapping& other) {
+		const ChanMapping::Mappings& mp (other.mappings());
+		for (Mappings::const_iterator tm = mp.begin(); tm != mp.end(); ++tm) {
+			for (TypeMapping::const_iterator i = tm->second.begin(); i != tm->second.end(); ++i) {
+#if 0
+				bool valid; uint32_t x = get (tm->first, i->first, &valid);
+				assert (!valid || x == i->second);
+#endif
+				set (tm->first, i->first, i->second);
+			}
+		}
+		return *this;
+	}
+
 private:
 	Mappings _mappings;
 };
diff --git a/libs/ardour/ardour/plugin_insert.h b/libs/ardour/ardour/plugin_insert.h
index 1441dfadb0..d64ee8f31d 100644
--- a/libs/ardour/ardour/plugin_insert.h
+++ b/libs/ardour/ardour/plugin_insert.h
@@ -69,7 +69,7 @@ class LIBARDOUR_API PluginInsert : public Processor
 
 	int set_block_size (pframes_t nframes);
 
-	ChanMapping input_map (uint32_t num=0) const {
+	ChanMapping input_map (uint32_t num) const {
 		if (num < _in_map.size()) {
 			return _in_map.find (num)->second;
 		} else {
@@ -77,7 +77,7 @@ class LIBARDOUR_API PluginInsert : public Processor
 		}
 	}
 
-	ChanMapping output_map (uint32_t num=0) const {
+	ChanMapping output_map (uint32_t num) const {
 		if (num < _out_map.size()) {
 			return _out_map.find (num)->second;
 		} else {
@@ -85,6 +85,22 @@ class LIBARDOUR_API PluginInsert : public Processor
 		}
 	}
 
+	ChanMapping input_map () const {
+		ChanMapping rv;
+		for (PinMappings::const_iterator i = _in_map.begin (); i != _in_map.end (); ++i) {
+			rv += i->second;
+		}
+		return rv;
+	}
+
+	ChanMapping output_map () const {
+		ChanMapping rv;
+		for (PinMappings::const_iterator i = _out_map.begin (); i != _out_map.end (); ++i) {
+			rv += i->second;
+		}
+		return rv;
+	}
+
 	void set_input_map (uint32_t, ChanMapping);
 	void set_output_map (uint32_t, ChanMapping);
 
diff --git a/libs/ardour/luabindings.cc b/libs/ardour/luabindings.cc
index dfcdfaec61..d7b9410bfc 100644
--- a/libs/ardour/luabindings.cc
+++ b/libs/ardour/luabindings.cc
@@ -374,8 +374,8 @@ LuaBindings::common (lua_State* L)
 		.addFunction ("deactivate", &PluginInsert::deactivate)
 		.addFunction ("strict_io_configured", &PluginInsert::strict_io_configured)
 		.addFunction ("no_inplace", &PluginInsert::no_inplace)
-		.addFunction ("input_map", &PluginInsert::input_map)
-		.addFunction ("output_map", &PluginInsert::output_map)
+		.addFunction ("input_map", (ARDOUR::ChanMapping (PluginInsert::*)(uint32_t) const)&PluginInsert::input_map)
+		.addFunction ("output_map", (ARDOUR::ChanMapping (PluginInsert::*)(uint32_t) const)&PluginInsert::output_map)
 		.addFunction ("set_no_inplace", &PluginInsert::set_no_inplace) // XXX
 		.addFunction ("set_input_map", &PluginInsert::set_input_map)
 		.addFunction ("set_output_map", &PluginInsert::set_output_map)