---
title: extensions
framework: coremedia
role: symbol
role_heading: Type Property
path: coremedia/cmformatdescription/equalitymask/extensions
---

# extensions

## Declaration

```swift
static let extensions: CMFormatDescription.EqualityMask
```

## See Also

### Equality Masks

- [all](coremedia/cmformatdescription/equalitymask/all.md)
- [channelLayout](coremedia/cmformatdescription/equalitymask/channellayout.md)
- [magicCookie](coremedia/cmformatdescription/equalitymask/magiccookie.md)
- [streamBasicDescription](coremedia/cmformatdescription/equalitymask/streambasicdescription.md)