# ExtAudioFileGetProperty(_:_:_:_:) Gets a property value from an extended audio file object. ``` func ExtAudioFileGetProperty(_ inExtAudioFile: ExtAudioFileRef, _ inPropertyID: ExtAudioFilePropertyID, _ ioPropertyDataSize: UnsafeMutablePointer, _ outPropertyData: UnsafeMutableRawPointer) -> OSStatus ``` ## Parameters `inExtAudioFile` The extended audio file object to get a property value from. `inPropertyID` The property whose value you want. `ioPropertyDataSize` On input, the size of the memory pointed to by the `outPropertyData` parameter. On output, the size of the property value. `outPropertyData` On output, the property value you wanted to get. ## Return Value A result code. ## Discussion Some Core Audio property values are C types and others are Core Foundation objects. If you call this function to retrieve a value that is a Core Foundation object, then this function—despite the use of “Get” in its name—duplicates the object. You are responsible for releasing the object, as described in [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029) in [Memory Management Programming Guide for Core Foundation](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/CFMemoryMgmt.html#//apple_ref/doc/uid/10000127i). --- 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)