coremidi_virtual_source.c

#include <assert.h>
#include <CoreMIDI/CoreMIDI.h>

char buffer[1024];

MIDIClientRef client = 0;
MIDIEndpointRef endpoint = 0;
MIDIPacketList *packetList = (void *)buffer;
MIDIPacket *packet = 0;
MIDIPortRef port = 0;

void timer_callback(CFRunLoopTimerRef timer, void *info)
{
	OSStatus status;
	unsigned char msg[3];

	MIDIPacket *packet = MIDIPacketListInit(packetList);
	msg[0] = 0xb0; msg[1] = 101; msg[2] =  0; packet = MIDIPacketListAdd(packetList, sizeof(buffer), packet, 0, sizeof(msg), msg);
	msg[0] = 0xb0; msg[1] = 100; msg[2] =  0; packet = MIDIPacketListAdd(packetList, sizeof(buffer), packet, 0, sizeof(msg), msg);
	msg[0] = 0xb0; msg[1] =   6; msg[2] = 24; packet = MIDIPacketListAdd(packetList, sizeof(buffer), packet, 0, sizeof(msg), msg);

	status = MIDIReceived(endpoint, packetList); assert(status == noErr);
}

int main(int argc, const char * argv[])
{
	OSStatus status;

	status = MIDIClientCreate(CFSTR("Virtual MIDI Source"), NULL, NULL, &client); assert(status == noErr);
	status = MIDISourceCreate(client, CFSTR("Virtual MIDI Source"), &endpoint); assert(status == noErr);
	status = MIDIOutputPortCreate(client, CFSTR("Virtual MIDI Source"), &port); assert(status == noErr);

	CFRunLoopTimerRef timer = CFRunLoopTimerCreate(0, 0, 5, 0, 0, &timer_callback, 0);
	CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes);
	CFRunLoopRun();

	return 0;
}