---
title: "VTDecompressionSessionCreate(allocator:formatDescription:decoderSpecification:imageBufferAttributes:decompressionSessionOut:)"
framework: videotoolbox
role: symbol
role_heading: Function
path: "videotoolbox/vtdecompressionsessioncreate(allocator:formatdescription:decoderspecification:imagebufferattributes:decompressionsessionout:)"
---

# VTDecompressionSessionCreate(allocator:formatDescription:decoderSpecification:imageBufferAttributes:decompressionSessionOut:)

## Declaration

```swift
func VTDecompressionSessionCreate(allocator: CFAllocator?, formatDescription videoFormatDescription: CMVideoFormatDescription, decoderSpecification videoDecoderSpecification: CFDictionary?, imageBufferAttributes destinationImageBufferAttributes: CFDictionary?, decompressionSessionOut: UnsafeMutablePointer<VTDecompressionSession?>) -> OSStatus
```

## See Also

### Creating a Session

- [VTDecompressionSessionCreate(allocator:formatDescription:decoderSpecification:imageBufferAttributes:outputCallback:decompressionSessionOut:)](videotoolbox/vtdecompressionsessioncreate(allocator:formatdescription:decoderspecification:imagebufferattributes:outputcallback:decompressionsessionout:).md)