+ DeviceSpecProto *device_proto = mapping_proto.add_device();
+ global_audio_mixer->serialize_device(bus.device, device_proto);
+
+ const auto delay_it = input_mapping.extra_delay_ms.find(bus.device);
+ if (delay_it != input_mapping.extra_delay_ms.end()) {
+ device_proto->set_extra_delay_ms(delay_it->second);
+ }