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# Format Settings

The audio settings that apply to all audio formats that the audio player and recorder classes support.

## Topics

### Settings

[`AVFormatIDKey`](/documentation/AVFAudio/AVFormatIDKey)

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

[`AVSampleRateKey`](/documentation/AVFAudio/AVSampleRateKey)

A floating point value that represents the sample rate, in hertz.

[`AVNumberOfChannelsKey`](/documentation/AVFAudio/AVNumberOfChannelsKey)

An integer value that represents the number of channels.


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