<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: -",
    "macOS: -",
    "tvOS: -",
    "visionOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "AudioToolbox",
  "identifier" : "/documentation/AudioToolbox/kExtAudioFileProperty_AudioConverter",
  "metadataVersion" : "0.1.0",
  "role" : "Global Variable",
  "symbol" : {
    "kind" : "Global Variable",
    "modules" : [
      "Audio Toolbox"
    ],
    "preciseIdentifier" : "c:@Ea@kExtAudioFileProperty_FileDataFormat@kExtAudioFileProperty_AudioConverter"
  },
  "title" : "kExtAudioFileProperty_AudioConverter"
}
-->

# kExtAudioFileProperty_AudioConverter

The audio converter object associated with the extended audio file object, if a converter is associated.

```
var kExtAudioFileProperty_AudioConverter: ExtAudioFilePropertyID { get }
```

## Discussion

The value is a read-only [`AudioConverterRef`](/documentation/AudioToolbox/AudioConverterRef) object.

## Discussion

If you alter any properties of the converter—the bit rate, for instance—you must then set the `kExtAudioFileProperty_ConverterConfig` property. When you do so, using a `NULL` configuration is sufficient. Setting that property ensure that the output file’s data format is consistent with the format being produced by the converter.

---

Copyright &copy; 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)