---
title: sourceAudioFormat
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avoutputsettingsassistant/sourceaudioformat
---

# sourceAudioFormat

The format of the source audio data.

## Declaration

```swift
var sourceAudioFormat: CMAudioFormatDescription? { get set }
```

## Discussion

Discussion The default value is nil, which means the assistant doesn’t know the audio format. Setting a value for this property helps the assistant generate more complete audio settings. After setting a value, requery the audioSettings property to get the latest values.

## See Also

### Configuring output settings

- [outputFileType](avfoundation/avoutputsettingsassistant/outputfiletype.md)
- [audioSettings](avfoundation/avoutputsettingsassistant/audiosettings.md)
- [videoSettings](avfoundation/avoutputsettingsassistant/videosettings.md)
- [sourceVideoFormat](avfoundation/avoutputsettingsassistant/sourcevideoformat.md)
- [sourceVideoMinFrameDuration](avfoundation/avoutputsettingsassistant/sourcevideominframeduration.md)
- [sourceVideoAverageFrameDuration](avfoundation/avoutputsettingsassistant/sourcevideoaverageframeduration.md)