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# kAudioSessionProperty_InputSources

Details on the available audio input sources.

```
var kAudioSessionProperty_InputSources: Int { get }
```

## Discussion

A <doc://com.apple.documentation/documentation/CoreFoundation/CFArray> object containing details on the available audio input sources in a USB audio accessory attached through the iPad camera connection kit.

## Discussion

Each element of the array contains a <doc://com.apple.documentation/documentation/CoreFoundation/CFDictionary> object with the keys and corresponding values described in [USB Accessory Audio Source Dictionary Keys](/documentation/AudioToolbox/usb-accessory-audio-source-dictionary-keys).

If there is no audio input source available from the attached accessory, this property’s value is an empty array.

This property is read-only. You can employ an [`AudioSessionPropertyListener`](/documentation/AudioToolbox/AudioSessionPropertyListener) callback function to listen for changes in this property’s value.

---

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