# AudioUnitGetPropertyInfo(_:_:_:_:_:_:) Gets information about an audio unit property. ``` func AudioUnitGetPropertyInfo(_ inUnit: AudioUnit, _ inID: AudioUnitPropertyID, _ inScope: AudioUnitScope, _ inElement: AudioUnitElement, _ outDataSize: UnsafeMutablePointer?, _ outWritable: UnsafeMutablePointer?) -> OSStatus ``` ## Parameters `inUnit` The audio unit that you want to get property information from. `inID` The identifier for the property. `inScope` The audio unit scope for the property. `inElement` The audio unit element for the property. `outDataSize` On successful output, the maximum size for the audio unit property. Can be `NULL` on input, in which case no value is returned. `outWritable` On successful output, a Boolean value indicating whether the property can be written to () or not (). Can be `NULL` on input, in which case no value is returned. ## Return Value A result code. ## Discussion Some properties that have read/write access when an audio unit is uninitialized become read-only when the audio unit is initialized. --- 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)