# IOUserMIDISource ``` class IOUserMIDISource; ``` ## Topics ### Instance Methods [`virtual IOUserMIDIClassID GetBaseClassID() const;`](/documentation/MIDIDriverKit/IOUserMIDISource/GetBaseClassID) [`virtual IOUserMIDIClassID GetClassID() const;`](/documentation/MIDIDriverKit/IOUserMIDISource/GetClassID) [`kern_return_t Send(const IOUserMIDIUMPWord *umpWords, size_t numWords);`](/documentation/MIDIDriverKit/IOUserMIDISource/Send) [`virtual void free();`](/documentation/MIDIDriverKit/IOUserMIDISource/free) [`virtual bool init(IOUserMIDIDriver *driver, OSString *name, IOUserMIDIProtocolID protocol);`](/documentation/MIDIDriverKit/IOUserMIDISource/init) ### Type Methods [`static OSSharedPtr Create(IOUserMIDIDriver *driver, OSString *name, IOUserMIDIProtocolID protocol);`](/documentation/MIDIDriverKit/IOUserMIDISource/Create) ## Relationships ### Inherits From [`IOUserMIDIEndpoint`](/documentation/MIDIDriverKit/IOUserMIDIEndpoint) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)