midi_to_osc.go

package main

import (
	"github.com/hypebeast/go-osc/osc"
	"github.com/rakyll/portmidi"
)

const (
	NOTEOFF = 0x80
	NOTEON  = 0x90
	KNOB    = 0xB0
)

func ListenForever(client *osc.Client, ch <-chan portmidi.Event) {
	for {
		event := <-ch
		HandleEvent(client, &event)
	}
}

func HandleEvent(client *osc.Client, event *portmidi.Event) {
	msg := osc.NewMessage("/message/address")
	msg.Append(int32(event.Status))
	msg.Append(int32(event.Data1))
	msg.Append(int32(event.Data2))
	client.Send(msg)
}

func main() {
	portmidi.Initialize()
	defer portmidi.Terminate()

	in, err := portmidi.NewInputStream(portmidi.DefaultInputDeviceID(), 1024)
	if err != nil {
		panic(err)
	}
	defer in.Close()

	done := make(<-chan bool)

	client := osc.NewClient("localhost", 8765)
	go ListenForever(client, in.Listen())

	<-done
}