---
title: kCMSampleAttachmentKey_HEVCSyncSampleNALUnitType
framework: coremedia
role: symbol
role_heading: Global Variable
path: coremedia/kcmsampleattachmentkey_hevcsyncsamplenalunittype
---

# kCMSampleAttachmentKey_HEVCSyncSampleNALUnitType

An attachment that indicates a sync sample NAL unit type.

## Declaration

```swift
let kCMSampleAttachmentKey_HEVCSyncSampleNALUnitType: CFString
```

## See Also

### Constants

- [kCMAttachmentMode_ShouldNotPropagate](coremedia/kcmattachmentmode_shouldnotpropagate.md)
- [kCMAttachmentMode_ShouldPropagate](coremedia/kcmattachmentmode_shouldpropagate.md)
- [kCMSampleAttachmentKey_HEVCTemporalLevelInfo](coremedia/kcmsampleattachmentkey_hevctemporallevelinfo.md)
- [kCMSampleAttachmentKey_HEVCTemporalSubLayerAccess](coremedia/kcmsampleattachmentkey_hevctemporalsublayeraccess.md)
- [kCMSampleAttachmentKey_HEVCStepwiseTemporalSubLayerAccess](coremedia/kcmsampleattachmentkey_hevcstepwisetemporalsublayeraccess.md)
- [kCMSampleAttachmentKey_CryptorSubsampleAuxiliaryData](coremedia/kcmsampleattachmentkey_cryptorsubsampleauxiliarydata.md)
- [kCMSampleAttachmentKey_AudioIndependentSampleDecoderRefreshCount](coremedia/kcmsampleattachmentkey_audioindependentsampledecoderrefreshcount.md)
- [kCMSampleBufferAttachmentKey_CameraIntrinsicMatrix](coremedia/kcmsamplebufferattachmentkey_cameraintrinsicmatrix.md)