# CMSwapBigEndianClosedCaptionDescriptionToHost(_:_:) Converts a closed caption description structure from big-endian to host-endian, in place. ``` func CMSwapBigEndianClosedCaptionDescriptionToHost(_ closedCaptionDescriptionData: UnsafeMutablePointer, _ closedCaptionDescriptionSize: Int) -> OSStatus ``` ## Parameters `closedCaptionDescriptionData` ClosedCaptionDescription data structure in big-endian byte ordering to be converted to host-endian byte ordering. `closedCaptionDescriptionSize` Size of ClosedCaptionDescription data structure. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)