Add AU support for output-channel/bus grouping

diff --git a/libs/ardour/audio_unit.cc b/libs/ardour/audio_unit.cc
index 13bc57973191282895464cb76b483378ed099b4d..f82ab3275ed812ebef6f4325c3ac5525f3c2088e 100644 (file)
--- a/libs/ardour/audio_unit.cc
+++ b/libs/ardour/audio_unit.cc
@@ -1958,6 +1958,8 @@ AUPlugin::describe_io_port (ARDOUR::DataType dt, bool input, uint32_t id) const
                        break;
        }
 
+       std::string busname;
+
        if (dt == DataType::AUDIO) {
                if (input) {
                        uint32_t pid = id;
@@ -1966,6 +1968,7 @@ AUPlugin::describe_io_port (ARDOUR::DataType dt, bool input, uint32_t id) const
                                        id = pid;
                                        ss << _bus_name_in[bus];
                                        ss << " / Bus " << (1 + bus);
+                                       busname = _bus_name_in[bus];
                                        break;
                                }
                                pid -= bus_inputs[bus];
@@ -1978,6 +1981,7 @@ AUPlugin::describe_io_port (ARDOUR::DataType dt, bool input, uint32_t id) const
                                        id = pid;
                                        ss << _bus_name_out[bus];
                                        ss << " / Bus " << (1 + bus);
+                                       busname = _bus_name_out[bus];
                                        break;
                                }
                                pid -= bus_outputs[bus];
@@ -1994,6 +1998,10 @@ AUPlugin::describe_io_port (ARDOUR::DataType dt, bool input, uint32_t id) const
        ss << (id + 1);
 
        Plugin::IOPortDescription iod (ss.str());
+       if (!busname.empty()) {
+               iod.group_name = busname;
+               iod.group_channel = id;
+       }
        return iod;
 }