# Audio File Stream Errors ## Topics ### Constants [`var kAudioFileStreamError_BadPropertySize: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_BadPropertySize) The size of the buffer you provided for property data was not correct. [`var kAudioFileStreamError_DataUnavailable: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_DataUnavailable) The amount of data provided to the parser was insufficient to produce any result. [`var kAudioFileStreamError_DiscontinuityCantRecover: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_DiscontinuityCantRecover) A discontinuity has occurred in the audio data, and Audio File Stream Services cannot recover. [`var kAudioFileStreamError_IllegalOperation: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_IllegalOperation) An illegal operation was attempted. [`var kAudioFileStreamError_InvalidFile: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_InvalidFile) The file is malformed, not a valid instance of an audio file of its type, or not recognized as an audio file. [`var kAudioFileStreamError_InvalidPacketOffset: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_InvalidPacketOffset) A packet offset was less than `0`, or past the end of the file, or a corrupt packet size was read when building the packet table. [`var kAudioFileStreamError_NotOptimized: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_NotOptimized) It is not possible to produce output packets because the streamed audio file’s packet table or other defining information is not present or appears after the audio data. [`var kAudioFileStreamError_UnspecifiedError: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_UnspecifiedError) An unspecified error has occurred. [`var kAudioFileStreamError_UnsupportedDataFormat: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_UnsupportedDataFormat) The data format is not supported by the specified file type. [`var kAudioFileStreamError_UnsupportedFileType: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_UnsupportedFileType) The specified file type is not supported. [`var kAudioFileStreamError_UnsupportedProperty: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_UnsupportedProperty) The property is not supported. [`var kAudioFileStreamError_ValueUnknown: OSStatus`](/documentation/AudioToolbox/kAudioFileStreamError_ValueUnknown) The property value is not present in this file before the audio data. --- 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)