---
title: AUAudioChannelCount
framework: audiotoolbox
role: symbol
role_heading: Type Alias
path: audiotoolbox/auaudiochannelcount
---

# AUAudioChannelCount

A number of audio channels.

## Declaration

```swift
typealias AUAudioChannelCount = UInt32
```

## Discussion

Discussion This alias is type uint32_t for impedance-matching with the pervasive use of UInt32 in the Audio Toolbox framework and the C Audio Unit framework APIs, as well as the AVAudioChannelCount data type.

## See Also

### Audio Unit Types

- [ScheduledAudioFileRegion](audiotoolbox/scheduledaudiofileregion.md)
- [ScheduledAudioSlice](audiotoolbox/scheduledaudioslice.md)
- [ScheduledAudioFileRegionCompletionProc](audiotoolbox/scheduledaudiofileregioncompletionproc.md)
- [ScheduledAudioSliceCompletionProc](audiotoolbox/scheduledaudioslicecompletionproc.md)
- [MIDIChannelNumber](audiotoolbox/midichannelnumber.md)
- [AUAudioObjectID](audiotoolbox/auaudioobjectid.md)
- [AUMIDICIProfileChangedBlock](audiotoolbox/aumidiciprofilechangedblock.md)
- [AUAudioFrameCount](audiotoolbox/auaudioframecount.md)
- [AUAudioUnitStatus](audiotoolbox/auaudiounitstatus.md)
- [AUEventListenerProc](audiotoolbox/aueventlistenerproc.md)
- [AUEventListenerRef](audiotoolbox/aueventlistenerref.md)
- [AUEventSampleTime](audiotoolbox/aueventsampletime.md)
- [AUImplementorValueObserver](audiotoolbox/auimplementorvalueobserver.md)
- [AUImplementorValueProvider](audiotoolbox/auimplementorvalueprovider.md)
- [AUInputHandler](audiotoolbox/auinputhandler.md)