---
title: "init(mASBD:mMagicCookie:mMagicCookieSize:mClassDescription:)"
framework: audiotoolbox
role: symbol
role_heading: Initializer
path: "audiotoolbox/extendedaudioformatinfo/init(masbd:mmagiccookie:mmagiccookiesize:mclassdescription:)"
---

# init(mASBD:mMagicCookie:mMagicCookieSize:mClassDescription:)

## Declaration

```swift
init(mASBD: AudioStreamBasicDescription, mMagicCookie: UnsafeRawPointer?, mMagicCookieSize: UInt32, mClassDescription: AudioClassDescription)
```