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

Creates an audio format instance with the specified audio format, sample rate, interleaved state, and channel layout.

```
init(commonFormat format: AVAudioCommonFormat, sampleRate: Double, interleaved: Bool, channelLayout layout: AVAudioChannelLayout)
```

## Parameters

`format`

The audio format.

`sampleRate`

The sampling rate, in hertz.

`interleaved`

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

`layout`

The channel layout, which must not be `nil`.

## Return Value

A new `AVAudioFormat` instance.

## 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.

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

The underlying audio channel layout.


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