---
title: CMFormatDescriptionGetTypeID()
framework: coremedia
role: symbol
role_heading: Function
path: coremedia/cmformatdescriptiongettypeid()
---

# CMFormatDescriptionGetTypeID()

Returns the Core Foundation type identifier that identifies format description objects.

## Declaration

```swift
func CMFormatDescriptionGetTypeID() -> CFTypeID
```

## Discussion

Discussion You can check if a CFTypeRef object is a CMFormatDescription by comparing CFGetTypeID(object) with CMFormatDescriptionGetTypeID().

## See Also

### Inspecting Format Descriptions

- [CMFormatDescriptionGetMediaType(_:)](coremedia/cmformatdescriptiongetmediatype(_:).md)
- [CMFormatDescriptionGetMediaSubType(_:)](coremedia/cmformatdescriptiongetmediasubtype(_:).md)
- [CMFormatDescriptionGetExtension(_:extensionKey:)](coremedia/cmformatdescriptiongetextension(_:extensionkey:).md)
- [CMFormatDescriptionGetExtensions(_:)](coremedia/cmformatdescriptiongetextensions(_:).md)