---
title: hevcStepwiseTemporalSubLayerAccess
framework: coremedia
role: symbol
role_heading: Instance Property
path: coremedia/cmsamplebuffer/sampleattachments-swift.struct/hevcstepwisetemporalsublayeraccess
---

# hevcStepwiseTemporalSubLayerAccess

Indicates a step-wise temporal sublayer access (STSA) sample grouping.

## Declaration

```swift
var hevcStepwiseTemporalSubLayerAccess: Bool { get set }
```

## Discussion

Discussion Corresponds to ‘stsa’ sample group. This attachment is read from and written to media files as specified in ISO/IEC 14496-15 section 8.4.7 Step-wise temporal layer access sample grouping.