Apple

You need to create a pair of MIDI Endpoints for your app; one is a Destination Endpoint with an appropriate Callback which would get called as the MIDI data you are playing come in to the system.

I think the Python package I mentioned in my reply to Tim is doing pretty much as you describe if I'm understanding the code correctly, I see the following in the C source file

...

typedef struct _SCMData {

MIDIClientRef theMidiClient;

MIDIEndpointRef midiSource;

MIDIEndpointRef midiDestination;

CFMutableDataRef receivedMidi;

} SCMData;

....

MIDIClientCreate(CFSTR("simple core midi client"), NULL, NULL,

&(_scmData.theMidiClient));

MIDISourceCreate(_scmData.theMidiClient, CFSTR("simple core midi source"),

&(_scmData.midiSource));

_scmData.receivedMidi = CFDataCreateMutable(kCFAllocatorDefault, 0);

MIDIDestinationCreate(_scmData.theMidiClient,

CFSTR("simple core midi destination"),

recvMidiProc,

NULL,

&(_scmData.midiDestination));

....

Whether you can take the input data to the Callback and harmonize it and get it into a MusicSequence that is playing a MusicPlayer, all in a timely fashion ...

I'm hoping that will be the case. The algorithm shouldn't introduce more than a few msec delay, if that, so the main trick will be get each Note Event as soon as it arrives from my keyboard and promptly buffer the results.

Thanks for explaining how it works. I'll let you know how it turns out.

Cheers,

Mike

References:
	>Re: Need help getting started with CoreMidi (From: David Hicks <email@hidden>)