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# init(commonFormat:sampleRate:channels:interleaved:)

Creates an audio format instance.

```
init?(commonFormat format: AVAudioCommonFormat, sampleRate: Double, channels: AVAudioChannelCount, interleaved: Bool)
```

## Parameters

`format`

The audio format.

`sampleRate`

The sampling rate, in hertz.

`channels`

The channel count.

`interleaved`

The Boolean value that indicates whether `format` is in an interleaved state.

## Return Value

A new `AVAudioFormat` instance, or `nil` if the initialization fails.

## Discussion

For information about possible `format` values, see [`AVAudioCommonFormat`](/documentation/AVFAudio/AVAudioCommonFormat).

## See Also

[`sampleRate`](/documentation/AVFAudio/AVAudioFormat/sampleRate)

The audio format sampling rate, in hertz.

[`isInterleaved`](/documentation/AVFAudio/AVAudioFormat/isInterleaved)

A Boolean value that indicates whether the samples mix into one stream.

[`commonFormat`](/documentation/AVFAudio/AVAudioFormat/commonFormat)

The common format identifier instance.


---

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