---
title: kAudioQueueProperty_MagicCookie
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudioqueueproperty_magiccookie
---

# kAudioQueueProperty_MagicCookie

Value is a read/write void pointer to a block of memory, which you set up, containing an audio format magic cookie. If the audio format you are playing or recording to requires a magic cookie, you must set a value for this property before enqueuing any buffers.

## Declaration

```swift
var kAudioQueueProperty_MagicCookie: AudioQueuePropertyID { get }
```

## See Also

### Constants

- [kAudioQueueDeviceProperty_NumberChannels](audiotoolbox/kaudioqueuedeviceproperty_numberchannels.md)
- [kAudioQueueDeviceProperty_SampleRate](audiotoolbox/kaudioqueuedeviceproperty_samplerate.md)
- [kAudioQueueProperty_ChannelLayout](audiotoolbox/kaudioqueueproperty_channellayout.md)
- [kAudioQueueProperty_ConverterError](audiotoolbox/kaudioqueueproperty_convertererror.md)
- [kAudioQueueProperty_CurrentDevice](audiotoolbox/kaudioqueueproperty_currentdevice.md)
- [kAudioQueueProperty_CurrentLevelMeter](audiotoolbox/kaudioqueueproperty_currentlevelmeter.md)
- [kAudioQueueProperty_CurrentLevelMeterDB](audiotoolbox/kaudioqueueproperty_currentlevelmeterdb.md)
- [kAudioQueueProperty_DecodeBufferSizeFrames](audiotoolbox/kaudioqueueproperty_decodebuffersizeframes.md)
- [kAudioQueueProperty_EnableLevelMetering](audiotoolbox/kaudioqueueproperty_enablelevelmetering.md)
- [kAudioQueueProperty_EnableTimePitch](audiotoolbox/kaudioqueueproperty_enabletimepitch.md)
- [kAudioQueueProperty_IsRunning](audiotoolbox/kaudioqueueproperty_isrunning.md)
- [kAudioQueueProperty_MaximumOutputPacketSize](audiotoolbox/kaudioqueueproperty_maximumoutputpacketsize.md)
- [kAudioQueueProperty_StreamDescription](audiotoolbox/kaudioqueueproperty_streamdescription.md)
- [kAudioQueueProperty_TimePitchAlgorithm](audiotoolbox/kaudioqueueproperty_timepitchalgorithm.md)
- [kAudioQueueProperty_TimePitchBypass](audiotoolbox/kaudioqueueproperty_timepitchbypass.md)