The APIs for working with the framework's Metadata Identifier Services and Metadata Data Type Registry.
- Core Media
The Core Media framework provides two services: Metadata Identifier Services, and the Metadata Data Type Registry.
Metadata Identifier Services provide a means of encoding the metadata identifying tuple (four byte key namespace and n-byte key value) into
CFString, and back again.
The Metadata Data Type Registry allows a process to register metadata data types that conform to a base data type and (optionally) other registered data types. The registry simplifies the process of creating format descriptions for non-trivial metadata values, as well as allowing clients to indicate how metadata can be interpreted.