---
title: CMIOExtensionStream.Direction
framework: coremediaio
role: symbol
role_heading: Enumeration
path: coremediaio/cmioextensionstream/direction-swift.enum
---

# CMIOExtensionStream.Direction

Constants that define the data-flow direction of the stream.

## Declaration

```swift
enum Direction
```

## Overview

Overview A stream can be a source or sink. A source stream produces samples, and a sink stream consumes samples.

## Topics

### Directions

- [CMIOExtensionStream.Direction.source](coremediaio/cmioextensionstream/direction-swift.enum/source.md)
- [CMIOExtensionStream.Direction.sink](coremediaio/cmioextensionstream/direction-swift.enum/sink.md)

### Initializers

- [init(rawValue:)](coremediaio/cmioextensionstream/direction-swift.enum/init(rawvalue:).md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Inspecting a Stream

- [source](coremediaio/cmioextensionstream/source.md)
- [direction](coremediaio/cmioextensionstream/direction-swift.property.md)
- [clockType](coremediaio/cmioextensionstream/clocktype-swift.property.md)
- [CMIOExtensionStream.ClockType](coremediaio/cmioextensionstream/clocktype-swift.enum.md)
- [customClockConfiguration](coremediaio/cmioextensionstream/customclockconfiguration.md)
- [CMIOExtensionStreamCustomClockConfiguration](coremediaio/cmioextensionstreamcustomclockconfiguration.md)