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# kAudioFormatProperty_TagForChannelLayout

An `AudioChannelLayoutTag` value for a layout.

```
var kAudioFormatProperty_TagForChannelLayout: AudioFormatPropertyID { get }
```

## Discussion

An AudioChannelLayoutTag value for a layout, if there is one. Set the `inSpecifier` parameter to an <doc://com.apple.documentation/documentation/CoreAudioTypes/AudioChannelLayout> structure containing the layout description. This can be used to reduce a layout specified by <doc://com.apple.documentation/documentation/CoreAudioTypes/kAudioChannelLayoutTag_UseChannelDescriptions> or <doc://com.apple.documentation/documentation/CoreAudioTypes/kAudioChannelLayoutTag_UseChannelBitmap> to a known AudioChannelLayoutTag value.

---

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