---
title: AVAssetReaderOutputCaptionAdaptor
framework: avfoundation
role: symbol
role_heading: Class
path: avfoundation/avassetreaderoutputcaptionadaptor
---

# AVAssetReaderOutputCaptionAdaptor

An object that reads caption group objects from an asset track that contains timed text.

## Declaration

```swift
class AVAssetReaderOutputCaptionAdaptor
```

## Topics

### Creating a caption adaptor

- [init(assetReaderTrackOutput:)](avfoundation/avassetreaderoutputcaptionadaptor/init(assetreadertrackoutput:).md)

### Accessing the track output

- [assetReaderTrackOutput](avfoundation/avassetreaderoutputcaptionadaptor/assetreadertrackoutput.md)

### Managing the validation delegate

- [validationDelegate](avfoundation/avassetreaderoutputcaptionadaptor/validationdelegate.md)
- [AVAssetReaderCaptionValidationHandling](avfoundation/avassetreadercaptionvalidationhandling.md)

### Reading caption groups

- [nextCaptionGroup()](avfoundation/avassetreaderoutputcaptionadaptor/nextcaptiongroup().md)
- [captionsNotPresentInPreviousGroups(in:)](avfoundation/avassetreaderoutputcaptionadaptor/captionsnotpresentinpreviousgroups(in:).md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Reading and writing

- [AVAssetWriterInputCaptionAdaptor](avfoundation/avassetwriterinputcaptionadaptor.md)