---
title: kCMTimeMappingSourceKey
framework: coremedia
role: symbol
role_heading: Global Variable
path: coremedia/kcmtimemappingsourcekey
---

# kCMTimeMappingSourceKey

A dictionary key for a source time range.

## Declaration

```swift
let kCMTimeMappingSourceKey: CFString
```

## See Also

### Constants

- [invalid](coremedia/cmtimemapping/invalid.md)
- [kCMTimeMappingTargetKey](coremedia/kcmtimemappingtargetkey.md)