---
title: "init(hostUserData:beatAndTempoProc:musicalTimeLocationProc:transportStateProc:transportStateProc2:)"
framework: audiotoolbox
role: symbol
role_heading: Initializer
path: "audiotoolbox/hostcallbackinfo/init(hostuserdata:beatandtempoproc:musicaltimelocationproc:transportstateproc:transportstateproc2:)"
---

# init(hostUserData:beatAndTempoProc:musicalTimeLocationProc:transportStateProc:transportStateProc2:)

## Declaration

```swift
init(hostUserData: UnsafeMutableRawPointer?, beatAndTempoProc: HostCallback_GetBeatAndTempo?, musicalTimeLocationProc: HostCallback_GetMusicalTimeLocation?, transportStateProc: HostCallback_GetTransportState?, transportStateProc2: HostCallback_GetTransportState2?)
```