---
title: AVFormatIDKey
framework: avfaudio
role: symbol
role_heading: Global Variable
path: avfaudio/avformatidkey
---

# AVFormatIDKey

An integer value that represents the format of the audio data.

## Declaration

```swift
let AVFormatIDKey: String
```

## Discussion

Discussion For information about the possible values for this key, see Audio Format Identifiers.

## See Also

### Settings

- [AVSampleRateKey](avfaudio/avsampleratekey.md)
- [AVNumberOfChannelsKey](avfaudio/avnumberofchannelskey.md)