# AudioCodecGetPropertyInfo(_:_:_:_:) Retrieves information about a codec property. ``` func AudioCodecGetPropertyInfo(_ inCodec: AudioCodec, _ inPropertyID: AudioCodecPropertyID, _ outSize: UnsafeMutablePointer?, _ outWritable: UnsafeMutablePointer?) -> OSStatus ``` ## Parameters `inCodec` An audio codec object. Because an audio codec object is a Component Manger component instance, you can use the Component Manager (for example, the functions and OpenAComponent) to obtain an audio codec object. `inPropertyID` Property ID of the property about which you want to obtain information. Codec property IDs are listed in [Global Codec Properties](/documentation/AudioToolbox/1494121-global-codec-properties) and [Instance Codec Properties](/documentation/AudioToolbox/1494111-instance-codec-properties). `outSize` On return, size in bytes of the current value of the property. `outWritable` Returns `true` if you can change the value of the property, otherwise `false`. ## Return Value Returns `NoErr` if successful, otherwise, a result code. See `Result Codes` for a list of possible values. ## Discussion Call this function to: - get the size of a property value before calling [`AudioCodecGetProperty(_:_:_:_:)`](/documentation/AudioToolbox/AudioCodecGetProperty(_:_:_:_:)) to retrieve the value - find out if a property value can be modified before calling [`AudioCodecSetProperty(_:_:_:_:)`](/documentation/AudioToolbox/AudioCodecSetProperty(_:_:_:_:)) to set the value --- 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)