---
title: CallHostBlock
framework: audiotoolbox
role: symbol
role_heading: Type Alias
path: audiotoolbox/callhostblock
---

# CallHostBlock

## Declaration

```swift
typealias CallHostBlock = ([AnyHashable : Any]) -> [AnyHashable : Any]
```

## See Also

### Data Types

- [AUMIDIEventListBlock](audiotoolbox/aumidieventlistblock.md)
- [AudioFileComponentGetUserDataAtOffsetProc](audiotoolbox/audiofilecomponentgetuserdataatoffsetproc.md)
- [AudioFileComponentGetUserDataSize64Proc](audiotoolbox/audiofilecomponentgetuserdatasize64proc.md)