# AudioFileStreamGetPropertyInfo(_:_:_:_:) Retrieves information about a property value. ``` func AudioFileStreamGetPropertyInfo(_ inAudioFileStream: AudioFileStreamID, _ inPropertyID: AudioFileStreamPropertyID, _ outPropertyDataSize: UnsafeMutablePointer?, _ outWritable: UnsafeMutablePointer?) -> OSStatus ``` ## Parameters `inAudioFileStream` The ID of the parser from which you wish to obtain information. The parser ID is returned by the [`AudioFileStreamOpen(_:_:_:_:_:)`](/documentation/AudioToolbox/AudioFileStreamOpen(_:_:_:_:_:)) function. `inPropertyID` A four-character ID indicating the audio file stream property about which you want information. See [Audio File Stream Properties](/documentation/AudioToolbox/1391506-audio-file-stream-properties) for possible values. `outPropertyDataSize` On output, the size, in bytes, of the current value of the specified property. `outWritable` On output, `true` if the property can be written. Currently, there are no writable audio file stream properties. ## Return Value A result code. See Result Codes. ## See Also [`AudioFileStreamOpen`](/documentation/AudioToolbox/AudioFileStreamOpen(_:_:_:_:_:)) Creates and opens a new audio file stream parser. --- 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)