---
title: AVAssetWriterInput.CaptionReceiver
framework: avfoundation
role: symbol
role_heading: Class
path: avfoundation/avassetwriterinput/captionreceiver
---

# AVAssetWriterInput.CaptionReceiver

Provides an interface for writing caption data to an input.

## Declaration

```swift
class CaptionReceiver
```

## Topics

### Appending captions

- [append(_:)](avfoundation/avassetwriterinput/captionreceiver/append(_:)-4opbd.md)
- [append(_:)](avfoundation/avassetwriterinput/captionreceiver/append(_:)-4wpi2.md)
- [appendImmediately(_:)](avfoundation/avassetwriterinput/captionreceiver/appendimmediately(_:)-7q21r.md)
- [appendImmediately(_:)](avfoundation/avassetwriterinput/captionreceiver/appendimmediately(_:)-9uy14.md)
- [finish()](avfoundation/avassetwriterinput/captionreceiver/finish().md)

## See Also

### Appending media samples

- [expectsMediaDataInRealTime](avfoundation/avassetwriterinput/expectsmediadatainrealtime.md)
- [isReadyForMoreMediaData](avfoundation/avassetwriterinput/isreadyformoremediadata.md)
- [requestMediaDataWhenReady(on:using:)](avfoundation/avassetwriterinput/requestmediadatawhenready(on:using:).md)
- [append(_:)](avfoundation/avassetwriterinput/append(_:).md)
- [markAsFinished()](avfoundation/avassetwriterinput/markasfinished().md)
- [AVAssetWriterInput.SampleBufferReceiver](avfoundation/avassetwriterinput/samplebufferreceiver.md)
- [AVAssetWriterInput.PixelBufferReceiver](avfoundation/avassetwriterinput/pixelbufferreceiver.md)
- [AVAssetWriterInput.TaggedPixelBufferGroupReceiver](avfoundation/avassetwriterinput/taggedpixelbuffergroupreceiver.md)
- [AVAssetWriterInput.MetadataReceiver](avfoundation/avassetwriterinput/metadatareceiver.md)