---
title: "CMVideoFormatDescriptionGetHEVCParameterSetAtIndex(_:parameterSetIndex:parameterSetPointerOut:parameterSetSizeOut:parameterSetCountOut:nalUnitHeaderLengthOut:)"
framework: coremedia
role: symbol
role_heading: Function
path: "coremedia/cmvideoformatdescriptiongethevcparametersetatindex(_:parametersetindex:parametersetpointerout:parametersetsizeout:parametersetcountout:nalunitheaderlengthout:)"
---

# CMVideoFormatDescriptionGetHEVCParameterSetAtIndex(_:parameterSetIndex:parameterSetPointerOut:parameterSetSizeOut:parameterSetCountOut:nalUnitHeaderLengthOut:)

Returns a parameter set contained in an HEVC (H.265) format description.

## Declaration

```swift
func CMVideoFormatDescriptionGetHEVCParameterSetAtIndex(_ videoDesc: CMFormatDescription, parameterSetIndex: Int, parameterSetPointerOut: UnsafeMutablePointer<UnsafePointer<UInt8>?>?, parameterSetSizeOut: UnsafeMutablePointer<Int>?, parameterSetCountOut: UnsafeMutablePointer<Int>?, nalUnitHeaderLengthOut NALUnitHeaderLengthOut: UnsafeMutablePointer<Int32>?) -> OSStatus
```

## See Also

### Functions

- [CMTimeFoldIntoRange(_:foldRange:)](coremedia/cmtimefoldintorange(_:foldrange:).md)