---
title: inputNumberOfChannels
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avaudiosession/inputnumberofchannels
---

# inputNumberOfChannels

The number of audio input channels for the current route.

## Declaration

```swift
var inputNumberOfChannels: Int { get }
```

## Discussion

Discussion You can observe changes to the value of this property by using key-value observing. For more information, see Using Key-Value Observing in Swift.

## See Also

### Setting the number of input channels

- [preferredInputNumberOfChannels](avfaudio/avaudiosession/preferredinputnumberofchannels.md)
- [setPreferredInputNumberOfChannels(_:)](avfaudio/avaudiosession/setpreferredinputnumberofchannels(_:).md)
- [maximumInputNumberOfChannels](avfaudio/avaudiosession/maximuminputnumberofchannels.md)