---
title: mMagicCookie
framework: audiotoolbox
role: symbol
role_heading: Instance Property
path: audiotoolbox/extendedaudioformatinfo/mmagiccookie
---

# mMagicCookie

Decompression information for the audio data format specified in the mASBD field.

## Declaration

```swift
var mMagicCookie: UnsafeRawPointer?
```