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# Time Code Format Description Constants

Constants that identify time code format descriptions.

## Topics

### Constants

[`let kCMTimeCodeFormatDescriptionKey_LangCode: CFString`](/documentation/CoreMedia/kCMTimeCodeFormatDescriptionKey_LangCode)

A key that describes the language code.

[`let kCMTimeCodeFormatDescriptionKey_Value: CFString`](/documentation/CoreMedia/kCMTimeCodeFormatDescriptionKey_Value)

A key that describes the value.

[`let kCMTimeCodeFormatDescriptionExtension_SourceReferenceName: CFString`](/documentation/CoreMedia/kCMTimeCodeFormatDescriptionExtension_SourceReferenceName)

An extension that describes the source reference name.


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