---
title: "equalTo(_:equalityMask:)"
framework: coremedia
role: symbol
role_heading: Instance Method
path: "coremedia/cmformatdescription/equalto(_:equalitymask:)"
---

# equalTo(_:equalityMask:)

Evaluates equality for the parts of two audio format descriptions.

## Declaration

```swift
func equalTo(_ otherFormatDescription: CMAudioFormatDescription, equalityMask: CMFormatDescription.EqualityMask = .all) -> (Bool, equalityMask: CMFormatDescription.EqualityMask)
```

## Parameters

- `otherFormatDescription`: A format description to compare.
- `equalityMask`: A mask that specifies which parts of the descriptions to compare.

## See Also

### Comparing Format Descriptions

- [==(_:_:)](coremedia/cmformatdescription/==(_:_:).md)
- [equalTo(_:extensionKeysToIgnore:sampleDescriptionExtensionAtomKeysToIgnore:)](coremedia/cmformatdescription/equalto(_:extensionkeystoignore:sampledescriptionextensionatomkeystoignore:).md)