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# canProcessInPlace

Determines whether an audio unit can process in place.

```
var canProcessInPlace: Bool { get }
```

## Discussion

In-place processing is the ability for an audio unit to transform an input signal to an output signal in-place in the input buffer, without requiring a separate output buffer.

A host can express its desire to process in place by using null `mData` pointers in the output buffer list. If so, the audio unit may process in-place in the input buffers.

This version 3 property is partially bridged to the version 2 `kAudioUnitProperty_InPlaceProcessing` API. It is not settable in version 3.

## See Also

[`renderBlock`](/documentation/AudioToolbox/AUAudioUnit/renderBlock)

The block that hosts use to ask the audio unit to render audio.


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