---
title: mSubType
framework: coreaudiotypes
role: symbol
role_heading: Instance Property
path: coreaudiotypes/audioclassdescription/msubtype
---

# mSubType

A four character code that a manufacturer defines for a codec subtype.

## Declaration

```swift
var mSubType: OSType
```

## See Also

### Accessing the Data

- [mType](coreaudiotypes/audioclassdescription/mtype.md)
- [mManufacturer](coreaudiotypes/audioclassdescription/mmanufacturer.md)