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# CMIOExtensionDeviceSource

A protocol for objects that act as device sources.

```
protocol CMIOExtensionDeviceSource : NSObjectProtocol
```

## Overview

Create a class that adopts this protocol to configure device properties.

## Topics

### Managing Properties

[`availableProperties`](/documentation/CoreMediaIO/CMIOExtensionDeviceSource/availableProperties)

A set of available properties that a device provides.

[`deviceProperties(forProperties:)`](/documentation/CoreMediaIO/CMIOExtensionDeviceSource/deviceProperties(forProperties:))

Retrieves the state of device properties.

[`setDeviceProperties(_:)`](/documentation/CoreMediaIO/CMIOExtensionDeviceSource/setDeviceProperties(_:))

Sets the state of device properties.


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