---
title: kCMAudioFormatDescriptionMask_Extensions
framework: coremedia
role: symbol
role_heading: Global Variable
path: coremedia/kcmaudioformatdescriptionmask_extensions
---

# kCMAudioFormatDescriptionMask_Extensions

A mask that represents the format description extensions.

## Declaration

```swift
var kCMAudioFormatDescriptionMask_Extensions: CMAudioFormatDescriptionMask { get }
```

## See Also

### Constants

- [kCMAudioFormatDescriptionMask_All](coremedia/kcmaudioformatdescriptionmask_all.md)
- [kCMAudioFormatDescriptionMask_ChannelLayout](coremedia/kcmaudioformatdescriptionmask_channellayout.md)
- [kCMAudioFormatDescriptionMask_MagicCookie](coremedia/kcmaudioformatdescriptionmask_magiccookie.md)
- [kCMAudioFormatDescriptionMask_StreamBasicDescription](coremedia/kcmaudioformatdescriptionmask_streambasicdescription.md)