---
title: "CMClosedCaptionFormatDescriptionCreateFromBigEndianClosedCaptionDescriptionBlockBuffer(allocator:bigEndianClosedCaptionDescriptionBlockBuffer:flavor:formatDescriptionOut:)"
framework: coremedia
role: symbol
role_heading: Function
path: "coremedia/cmclosedcaptionformatdescriptioncreatefrombigendianclosedcaptiondescriptionblockbuffer(allocator:bigendianclosedcaptiondescriptionblockbuffer:flavor:formatdescriptionout:)"
---

# CMClosedCaptionFormatDescriptionCreateFromBigEndianClosedCaptionDescriptionBlockBuffer(allocator:bigEndianClosedCaptionDescriptionBlockBuffer:flavor:formatDescriptionOut:)

Creates a closed caption format description from a big-endian closed caption description structure in a buffer.

## Declaration

```swift
func CMClosedCaptionFormatDescriptionCreateFromBigEndianClosedCaptionDescriptionBlockBuffer(allocator: CFAllocator?, bigEndianClosedCaptionDescriptionBlockBuffer closedCaptionDescriptionBlockBuffer: CMBlockBuffer, flavor: CMClosedCaptionDescriptionFlavor?, formatDescriptionOut: UnsafeMutablePointer<CMClosedCaptionFormatDescription?>) -> OSStatus
```

## Parameters

- `allocator`: Allocator to use for allocating the CMClosedCaptionFormatDescription object. May be NULL.
- `closedCaptionDescriptionBlockBuffer`: CMBlockBuffer containing ClosedCaptionDescription data structure in big-endian byte ordering.
- `flavor`: Reserved for future use. Pass NULL for QuickTime Movie or ISO flavor.
- `formatDescriptionOut`: Receives new CMClosedCaptionFormatDescription.

## See Also

### Working with Closed Captioning Descriptions

- [CMClosedCaptionDescriptionFlavor](coremedia/cmclosedcaptiondescriptionflavor.md)
- [CMClosedCaptionFormatDescriptionCopyAsBigEndianClosedCaptionDescriptionBlockBuffer(allocator:closedCaptionFormatDescription:flavor:blockBufferOut:)](coremedia/cmclosedcaptionformatdescriptioncopyasbigendianclosedcaptiondescriptionblockbuffer(allocator:closedcaptionformatdescription:flavor:blockbufferout:).md)
- [CMClosedCaptionFormatDescriptionCreateFromBigEndianClosedCaptionDescriptionData(allocator:bigEndianClosedCaptionDescriptionData:size:flavor:formatDescriptionOut:)](coremedia/cmclosedcaptionformatdescriptioncreatefrombigendianclosedcaptiondescriptiondata(allocator:bigendianclosedcaptiondescriptiondata:size:flavor:formatdescriptionout:).md)
- [CMSwapHostEndianClosedCaptionDescriptionToBig(_:_:)](coremedia/cmswaphostendianclosedcaptiondescriptiontobig(_:_:).md)
- [CMSwapBigEndianClosedCaptionDescriptionToHost(_:_:)](coremedia/cmswapbigendianclosedcaptiondescriptiontohost(_:_:).md)