---
title: kAudioConverterCompressionMagicCookie
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudioconvertercompressionmagiccookie
---

# kAudioConverterCompressionMagicCookie

A void* value that points to memory set up by the caller. This property is returned by the converter so that your application may store it along with the output data. This property can then be passed back to the converter for decompression at a later time.

## Declaration

```swift
var kAudioConverterCompressionMagicCookie: AudioConverterPropertyID { get }
```

## See Also

### Constants

- [kAudioConverterPropertyMinimumInputBufferSize](audiotoolbox/kaudioconverterpropertyminimuminputbuffersize.md)
- [kAudioConverterPropertyMinimumOutputBufferSize](audiotoolbox/kaudioconverterpropertyminimumoutputbuffersize.md)
- [kAudioConverterPropertyMaximumInputBufferSize](audiotoolbox/kaudioconverterpropertymaximuminputbuffersize.md)
- [kAudioConverterPropertyMaximumInputPacketSize](audiotoolbox/kaudioconverterpropertymaximuminputpacketsize.md)
- [kAudioConverterPropertyMaximumOutputPacketSize](audiotoolbox/kaudioconverterpropertymaximumoutputpacketsize.md)
- [kAudioConverterPropertyCalculateInputBufferSize](audiotoolbox/kaudioconverterpropertycalculateinputbuffersize.md)
- [kAudioConverterPropertyCalculateOutputBufferSize](audiotoolbox/kaudioconverterpropertycalculateoutputbuffersize.md)
- [kAudioConverterPropertyInputCodecParameters](audiotoolbox/kaudioconverterpropertyinputcodecparameters.md)
- [kAudioConverterPropertyOutputCodecParameters](audiotoolbox/kaudioconverterpropertyoutputcodecparameters.md)
- [kAudioConverterSampleRateConverterAlgorithm](audiotoolbox/kaudioconvertersamplerateconverteralgorithm.md)
- [kAudioConverterSampleRateConverterComplexity](audiotoolbox/kaudioconvertersamplerateconvertercomplexity.md)
- [kAudioConverterSampleRateConverterQuality](audiotoolbox/kaudioconvertersamplerateconverterquality.md)
- [kAudioConverterSampleRateConverterInitialPhase](audiotoolbox/kaudioconvertersamplerateconverterinitialphase.md)
- [kAudioConverterCodecQuality](audiotoolbox/kaudioconvertercodecquality.md)
- [kAudioConverterPrimeMethod](audiotoolbox/kaudioconverterprimemethod.md)