// (midi-write 144 60 80) -> middle C note on
// (midi-write 128 60 0) -> middle C note off
func midiWrite(argv []*ell.Object) (*ell.Object, error) {
status := ell.Int64Value(argv[0])
data1 := ell.Int64Value(argv[1])
data2 := ell.Int64Value(argv[2])
midiMutex.Lock()
var err error
if midiOut != nil {
err = midiOut.WriteShort(status, data1, data2)
}
midiMutex.Unlock()
return ell.Null, err
}
func midiOpen(argv []*ell.Object) (*ell.Object, error) {
// defaultInput := "USB Oxygen 8 v2"
// defaultOutput := "IAC Driver Bus 1"
latency := int64(10)
if !midiOpened {
err := portmidi.Initialize()
if err != nil {
return nil, err
}
midiOpened = true
midiInDevice = ell.StringValue(argv[0])
midiOutDevice = ell.StringValue(argv[1])
midiBufsize = ell.Int64Value(argv[2])
outdev, outname := findMidiOutputDevice(midiOutDevice)
out, err := portmidi.NewOutputStream(outdev, midiBufsize, latency)
if err != nil {
return nil, err
}
midiOut = out
midiOutDevice = outname
if midiInDevice != "" {
indev := findMidiInputDevice(midiInDevice)
if indev >= 0 {
in, err := portmidi.NewInputStream(indev, midiBufsize)
if err != nil {
return nil, err
}
midiIn = in
}
}
midiBaseTime = ell.Now()
}
result := ell.MakeStruct(4)
if midiInDevice != "" {
ell.Put(result, inputKey, ell.String(midiInDevice))
}
if midiOutDevice != "" {
ell.Put(result, outputKey, ell.String(midiOutDevice))
}
ell.Put(result, bufsizeKey, ell.Number(float64(midiBufsize)))
return result, nil
}