---
title: "init(subBlockCapacity:)"
framework: coremedia
role: symbol
role_heading: Initializer
path: "coremedia/cmreadonlydatablockbuffer/init(subblockcapacity:)"
---

# init(subBlockCapacity:)

Create empty block buffer.

## Declaration

```swift
init(subBlockCapacity: Int = 0)
```

## Parameters

- `subBlockCapacity`: Minimum number of sub blocks in this block buffer.