# Anonymous ## Topics ### Constants [`var kAudioQueueErr_BufferEmpty: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_BufferEmpty) The audio queue buffer is empty (that is, the `mAudioDataByteSize` field = `0`). [`var kAudioQueueErr_BufferEnqueuedTwice: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_BufferEnqueuedTwice) [`var kAudioQueueErr_BufferInQueue: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_BufferInQueue) The audio queue buffer cannot be disposed of when it is enqueued. [`var kAudioQueueErr_CannotStart: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_CannotStart) The audio queue has encountered a problem and cannot start. [`var kAudioQueueErr_CodecNotFound: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_CodecNotFound) The requested codec was not found. [`var kAudioQueueErr_DisposalPending: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_DisposalPending) The function cannot act on the audio queue because it is being asynchronously disposed of. [`var kAudioQueueErr_EnqueueDuringReset: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_EnqueueDuringReset) During a call to the [`AudioQueueReset(_:)`](/documentation/AudioToolbox/AudioQueueReset(_:)), [`AudioQueueStop(_:_:)`](/documentation/AudioToolbox/AudioQueueStop(_:_:)), or [`AudioQueueDispose(_:_:)`](/documentation/AudioToolbox/AudioQueueDispose(_:_:)) functions, the system does not allow you to enqueue buffers. [`var kAudioQueueErr_InvalidBuffer: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidBuffer) The specified audio queue buffer does not belong to the specified audio queue. [`var kAudioQueueErr_InvalidCodecAccess: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidCodecAccess) The codec could not be accessed. [`var kAudioQueueErr_InvalidDevice: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidDevice) The specified audio hardware device could not be located. [`var kAudioQueueErr_InvalidOfflineMode: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidOfflineMode) The operation requires the audio queue to be in offline mode but it isn’t, or vice versa. [`var kAudioQueueErr_InvalidParameter: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidParameter) The specified parameter ID is invalid. [`var kAudioQueueErr_InvalidProperty: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidProperty) The specified property ID is invalid. [`var kAudioQueueErr_InvalidPropertySize: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidPropertySize) The size of the specified property is invalid. [`var kAudioQueueErr_InvalidPropertyValue: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidPropertyValue) The property value used is not valid. [`var kAudioQueueErr_InvalidQueueType: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidQueueType) The queue is an input queue but the function can only operate on an output queue, or vice versa. [`var kAudioQueueErr_InvalidRunState: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidRunState) The queue is running but the function can only operate on the queue when it is stopped, or vice versa. [`var kAudioQueueErr_InvalidTapContext: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidTapContext) [`var kAudioQueueErr_InvalidTapType: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_InvalidTapType) [`var kAudioQueueErr_Permissions: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_Permissions) You do not have the required permissions to call the function. [`var kAudioQueueErr_PrimeTimedOut: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_PrimeTimedOut) During a call to the [`AudioQueuePrime(_:_:_:)`](/documentation/AudioToolbox/AudioQueuePrime(_:_:_:)) function, the audio queue’s audio converter failed to convert the requested number of sample frames. [`var kAudioQueueErr_QueueInvalidated: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_QueueInvalidated) In iOS, the audio server has exited, causing the audio queue to become invalid. [`var kAudioQueueErr_RecordUnderrun: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_RecordUnderrun) During recording, data was lost because there was no enqueued buffer to store it in. [`var kAudioQueueErr_TooManyTaps: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_TooManyTaps) [`var kAudioQueueErr_CannotStartYet: OSStatus`](/documentation/AudioToolbox/kAudioQueueErr_CannotStartYet) --- 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)