# AudioServicesGetProperty(_:_:_:_:_:) Gets a specified System Sound Services property value. ``` func AudioServicesGetProperty(_ inPropertyID: AudioServicesPropertyID, _ inSpecifierSize: UInt32, _ inSpecifier: UnsafeRawPointer?, _ ioPropertyDataSize: UnsafeMutablePointer, _ outPropertyData: UnsafeMutableRawPointer?) -> OSStatus ``` ## Parameters `inPropertyID` The property whose value you want. `inSpecifierSize` The size of the buffer pointed to by the `inSpecifier` parameter. Pass `0` if no specifier buffer is required. `inSpecifier` A pointer to a specifier buffer, if such a buffer is required by the property about which you want information. Pass `NULL` if no specifier is required. `ioPropertyDataSize` On input, the size, in bytes, of the buffer pointed to by the `outPropertyData` parameter. Call the [`AudioServicesGetPropertyInfo(_:_:_:_:_:)`](/documentation/AudioToolbox/AudioServicesGetPropertyInfo(_:_:_:_:_:)) function to find out the size required for this buffer. On output, the number of bytes written to the buffer. `outPropertyData` On output, the property value. ## Return Value A result code. ## Discussion System Sound Services properties are listed and described in [System Sound Services Property Identifiers](/documentation/AudioToolbox/1405268-system-sound-services-property-i). ### Special Considerations 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)