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# AVCaptureInput.Port

An object that represents a stream of data that a capture input provides.

```
class Port
```

## Overview

Instances of [`AVCaptureInput`](/documentation/AVFoundation/AVCaptureInput) have one or more input ports, one for each data stream they can produce. For example, an [`AVCaptureDeviceInput`](/documentation/AVFoundation/AVCaptureDeviceInput) object presenting one video data stream has one port.

## Topics

### Inspecting an input port

[`isEnabled`](/documentation/AVFoundation/AVCaptureInput/Port/isEnabled)

A Boolean value that indicates whether the port is in an enabled state.

[`mediaType`](/documentation/AVFoundation/AVCaptureInput/Port/mediaType)

The media type of the port.

[`formatDescription`](/documentation/AVFoundation/AVCaptureInput/Port/formatDescription)

A description of the port format.

[`sourceDeviceType`](/documentation/AVFoundation/AVCaptureInput/Port/sourceDeviceType)

The device type of the source camera that provides data to the port.

[`sourceDevicePosition`](/documentation/AVFoundation/AVCaptureInput/Port/sourceDevicePosition)

The position of the source device providing input through this port.

[`clock`](/documentation/AVFoundation/AVCaptureInput/Port/clock)

An object that represents the capture device’s clock.

### Observing format changes

[`formatDescriptionDidChangeNotification`](/documentation/AVFoundation/AVCaptureInput/Port/formatDescriptionDidChangeNotification)

A notification the system posts when the capture input port’s format description changes.

### Accessing the input

[`input`](/documentation/AVFoundation/AVCaptureInput/Port/input)

The input object that owns the port.


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