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

# kAudioConverterPropertyFormatList

An array of `AudioFormatListItem` structures that describes the set of data formats produced by the encoder end of an audio converter.

```
var kAudioConverterPropertyFormatList: AudioConverterPropertyID { get }
```

## Discussion

If the `ioPropertyDataSize` parameter of the [`AudioConverterGetProperty(_:_:_:_:)`](/documentation/AudioToolbox/AudioConverterGetProperty(_:_:_:_:)) function indicates that the size of the data in the `outPropertyData` parameter is `sizeof (AudioFormatListItem)`, then only the best format is returned. This property may be used, for example, to discover all the data formats produced by the AAC High Efficiency version 2 encoder (specified by the `kAudioFormatMPEG4AAC_HE_V2` constant).

---

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)