---
title: AUAudioUnitBusType.input
framework: audiotoolbox
role: symbol
role_heading: Case
path: audiotoolbox/auaudiounitbustype/input
---

# AUAudioUnitBusType.input

An input bus.

## Declaration

```swift
case input
```

## See Also

### Constants

- [AUAudioUnitBusType.output](audiotoolbox/auaudiounitbustype/output.md)