---
title: "init(standardFormatWithSampleRate:channels:)"
framework: avfaudio
role: symbol
role_heading: Initializer
path: "avfaudio/avaudioformat/init(standardformatwithsamplerate:channels:)"
---

# init(standardFormatWithSampleRate:channels:)

Creates an audio format instance with the specified sample rate and channel count.

## Declaration

```swift
init?(standardFormatWithSampleRate sampleRate: Double, channels: AVAudioChannelCount)
```

## Parameters

- `sampleRate`: The sampling rate, in hertz.
- `channels`: The channel count.

## Return Value

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

## Discussion

Discussion The returned AVAudioFormat instance uses the AVAudioCommonFormat.pcmFormatFloat32 format.

## See Also

### Related Documentation

- [sampleRate](avfaudio/avaudioformat/samplerate.md)
- [channelLayout](avfaudio/avaudioformat/channellayout.md)

### Creating a New Audio Format Representation

- [init(standardFormatWithSampleRate:channelLayout:)](avfaudio/avaudioformat/init(standardformatwithsamplerate:channellayout:).md)
- [init(commonFormat:sampleRate:channels:interleaved:)](avfaudio/avaudioformat/init(commonformat:samplerate:channels:interleaved:).md)
- [init(commonFormat:sampleRate:interleaved:channelLayout:)](avfaudio/avaudioformat/init(commonformat:samplerate:interleaved:channellayout:).md)
- [init(settings:)](avfaudio/avaudioformat/init(settings:).md)
- [init(streamDescription:)](avfaudio/avaudioformat/init(streamdescription:).md)
- [init(streamDescription:channelLayout:)](avfaudio/avaudioformat/init(streamdescription:channellayout:).md)
- [init(formatDescription:)](avfaudio/avaudioformat/init(formatdescription:).md)
- [init(cmAudioFormatDescription:)](avfaudio/avaudioformat/init(cmaudioformatdescription:)-8rdfj.md)