---
title: CMMutableDataBlockBuffer.BlockRegion
framework: coremedia
role: symbol
role_heading: Structure
path: coremedia/cmmutabledatablockbuffer/blockregion
---

# CMMutableDataBlockBuffer.BlockRegion

A contiguous region of mutable memory within a block buffer.

## Declaration

```swift
struct BlockRegion
```

## Topics

### Instance Properties

- [count](coremedia/cmmutabledatablockbuffer/blockregion/count.md)
- [endIndex](coremedia/cmmutabledatablockbuffer/blockregion/endindex.md)
- [regions](coremedia/cmmutabledatablockbuffer/blockregion/regions.md)
- [startIndex](coremedia/cmmutabledatablockbuffer/blockregion/startindex.md)

### Instance Methods

- [withUnsafeBytes(_:)](coremedia/cmmutabledatablockbuffer/blockregion/withunsafebytes(_:).md)
- [withUnsafeMutableBytes(_:)](coremedia/cmmutabledatablockbuffer/blockregion/withunsafemutablebytes(_:).md)

### Subscripts

- [subscript(_:)](coremedia/cmmutabledatablockbuffer/blockregion/subscript(_:).md)

## Relationships

### Conforms To

- [BidirectionalCollection](swift/bidirectionalcollection.md)
- [Collection](swift/collection.md)
- [ContiguousBytes](foundation/contiguousbytes.md)
- [DataProtocol](foundation/dataprotocol.md)
- [RandomAccessCollection](swift/randomaccesscollection.md)
- [Sequence](swift/sequence.md)