# withUnsafeAudioStreamPacketDescriptions(_:) Calls a closure with an audio stream packet description. ``` func withUnsafeAudioStreamPacketDescriptions(_ body: (UnsafeBufferPointer) throws -> R) throws -> R ``` ## Parameters `body` A closure the system calls with a pointer to an audio stream packet description. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)