# CMMetadataFormatDescriptionCreateFromBigEndianMetadataDescriptionData(allocator:bigEndianMetadataDescriptionData:size:flavor:formatDescriptionOut:) Creates a metadata format description from a big-endian metadata description structure. ``` func CMMetadataFormatDescriptionCreateFromBigEndianMetadataDescriptionData(allocator: CFAllocator?, bigEndianMetadataDescriptionData metadataDescriptionData: UnsafePointer, size: Int, flavor: CMMetadataDescriptionFlavor?, formatDescriptionOut: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `allocator` Allocator to use for allocating the CMMetadataFormatDescription object. May be `NULL`. `metadataDescriptionData` MetadataDescription data structure in big-endian byte ordering. `size` Size of MetadataDescription data structure. `flavor` Reserved for future use. Pass `NULL` for QuickTime Movie or ISO flavor. `formatDescriptionOut` Receives new CMMetadataFormatDescriptionRef. --- 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)