# audioBufferList The buffer’s underlying audio buffer list. ``` var audioBufferList: UnsafePointer { get } ``` ## Discussion A buffer list is a variable length array that contains an array of audio buffer instances. You use it with lower-level Core Audio and Audio Toolbox API. You must not modify the buffer list structure, although you can modify buffer contents. The `mDataByteSize` fields of this audio buffer list express the buffer’s current [`frameLength`](/documentation/AVFAudio/AVAudioPCMBuffer/frameLength). --- 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)