Add API to AudioBackend to request update to devices

diff --git a/libs/ardour/ardour/audio_backend.h b/libs/ardour/ardour/audio_backend.h
index 2bbd891e989aff1991cbf08c62e1468873f8336e..ed5b0532746b61e72e672fdc482249657f6c28c3 100644 (file)
--- a/libs/ardour/ardour/audio_backend.h
+++ b/libs/ardour/ardour/audio_backend.h
@@ -219,6 +219,20 @@ class LIBARDOUR_API AudioBackend : public PortEngine {
     virtual std::vector<DeviceStatus> enumerate_output_devices () const
     { return std::vector<DeviceStatus>(); }
 
+       /**
+        * @return true if backend supports requesting an update to the device list
+        * and any cached properties associated with the devices.
+        */
+       virtual bool can_request_update_devices () { return false; }
+
+       /**
+        * Request an update to the list of devices returned in the enumerations.
+        * The Backend must return true from can_request_update_devices to support
+        * this interface.
+        * @return true if the devices were updated
+        */
+       virtual bool update_devices () { return false; }
+
     /** Returns a collection of float identifying sample rates that are
      * potentially usable with the hardware identified by @param device.
      * Any of these values may be supplied in other calls to this backend