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# AVAudioEnvironmentOutputType

The output types for using with the automatic 3D mixing rendering algorithm.

```
enum AVAudioEnvironmentOutputType
```

## Overview

The output type determines the rendering method for any input bus using [`AVAudio3DMixingRenderingAlgorithm.auto`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/auto). To configure the output type, set [`outputType`](/documentation/AVFAudio/AVAudioEnvironmentNode/outputType) on [`AVAudioEnvironmentNode`](/documentation/AVFAudio/AVAudioEnvironmentNode).

## Topics

### Output Types

[`AVAudioEnvironmentOutputType.auto`](/documentation/AVFAudio/AVAudioEnvironmentOutputType/auto)

Automatically detects the playback route and picks the correct output.

[`AVAudioEnvironmentOutputType.headphones`](/documentation/AVFAudio/AVAudioEnvironmentOutputType/headphones)

Renders the audio output for headphones.

[`AVAudioEnvironmentOutputType.builtInSpeakers`](/documentation/AVFAudio/AVAudioEnvironmentOutputType/builtInSpeakers)

Renders the audio output for built-in speakers on the current hardware.

[`AVAudioEnvironmentOutputType.externalSpeakers`](/documentation/AVFAudio/AVAudioEnvironmentOutputType/externalSpeakers)

Renders the audio output for external speakers according to the audio environment node’s output channel layout.


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