---
title: init
framework: mediatoolbox
role: symbol
role_heading: Instance Property
path: mediatoolbox/mtaudioprocessingtapcallbacks/init
---

# init

A callback to initialize the tap processor.

## Declaration

```swift
var `init`: MTAudioProcessingTapInitCallback?
```

## Discussion

Discussion This callback is called before MTAudioProcessingTapCreate(_:_:_:_:) returns. This field can be NULL.

## See Also

### Fields

- [version](mediatoolbox/mtaudioprocessingtapcallbacks/version.md)
- [clientInfo](mediatoolbox/mtaudioprocessingtapcallbacks/clientinfo.md)
- [finalize](mediatoolbox/mtaudioprocessingtapcallbacks/finalize.md)
- [prepare](mediatoolbox/mtaudioprocessingtapcallbacks/prepare.md)
- [unprepare](mediatoolbox/mtaudioprocessingtapcallbacks/unprepare.md)
- [process](mediatoolbox/mtaudioprocessingtapcallbacks/process.md)