---
title: refCon
framework: coremedia
role: symbol
role_heading: Instance Property
path: coremedia/cmblockbuffercustomblocksource/refcon
---

# refCon

Contextual information passed to both the allocate and free function calls.

## Declaration

```swift
var refCon: UnsafeMutableRawPointer?
```

## See Also

### Properties

- [AllocateBlock](coremedia/cmblockbuffercustomblocksource/allocateblock.md)
- [FreeBlock](coremedia/cmblockbuffercustomblocksource/freeblock.md)
- [version](coremedia/cmblockbuffercustomblocksource/version.md)