fn remove_devices_changed_listener()

in src/backend/mod.rs [2588:2629]

• 37 lines of code
• 7 McCabe index (conditional complexity)

    fn remove_devices_changed_listener(&mut self, devtype: DeviceType) -> Result<()> {
        if !devtype.intersects(DeviceType::INPUT | DeviceType::OUTPUT) {
            return Err(Error::invalid_parameter());
        }

        let context_ptr = self as *mut AudioUnitContext;
        let mut devices = self.devices.lock().unwrap();

        if devtype.contains(DeviceType::INPUT) {
            devices.input.clear();
        }

        if devtype.contains(DeviceType::OUTPUT) {
            devices.output.clear();
        }

        if devices.input.changed_callback.is_some() || devices.output.changed_callback.is_some() {
            return Ok(());
        }

        let address = get_property_address(
            Property::HardwareDevices,
            DeviceType::INPUT | DeviceType::OUTPUT,
        );
        // Note: unregister a non registered cb is not a problem, not checking.
        let r = audio_object_remove_property_listener(
            kAudioObjectSystemObject,
            &address,
            audiounit_collection_changed_callback,
            context_ptr,
        );
        if r == NO_ERR {
            Ok(())
        } else {
            cubeb_log!(
                "Cannot remove devices-changed listener for {:?}, Error: {}",
                devtype,
                r
            );
            Err(Error::error())
        }
    }