Esempio n. 1
0
// discovers the currently connected Launchpad device
// as a MIDI device.
func discover() (input portmidi.DeviceID, output portmidi.DeviceID, err error) {
	in := -1
	out := -1
	for i := 0; i < portmidi.CountDevices(); i++ {
		info := portmidi.Info(portmidi.DeviceID(i))
		if strings.Contains(info.Name, "Launchpad") {
			if info.IsInputAvailable {
				in = i
			}
			if info.IsOutputAvailable {
				out = i
			}
		}
	}
	if in == -1 || out == -1 {
		err = errors.New("launchpad: no launchpad is connected")
	} else {
		input = portmidi.DeviceID(in)
		output = portmidi.DeviceID(out)
	}
	return
}
Esempio n. 2
0
func main() {
	flag.Parse()

	var err error
	if err = portmidi.Initialize(); err != nil {
		log.Fatal("error while initializing portmidi", err)
	}

	if out, err = portmidi.NewOutputStream(portmidi.DeviceID(*flagOutput), 1024, 0); err != nil {
		log.Fatal("error while initializing connection to midi out stream")
	}

	if pad, err = launchpad.Open(); err != nil {
		log.Fatal("error while initializing connection to launchpad", err)
	}

	grid = newGrid()
	instruments = []int{
		70, // maracas
		38, // snare 1
		40, // snare 2
		51, // ride cymbal
		42, // closed hi-hat
		58, // vibra slap
		46, // open hi-hat
		81} // open triangle

	// load an initial drum pattern
	// hi-hats
	grid[0][4] = true
	grid[2][4] = true
	grid[4][4] = true
	grid[6][4] = true
	// snares
	grid[5][3] = true
	grid[5][2] = true
	grid[5][1] = true
	// bells
	grid[6][7] = true
	grid[7][7] = true
	grid[5][6] = true

	// clear
	pad.Reset()

	// listen button toggles
	ch := pad.Listen()
	go func() {
		for {
			hit := <-ch
			log.Println("drum toggled at", hit)
			if hit.Y == -1 || hit.X > 7 {
				// a controller button is hit
				continue
			}
			grid[hit.X][hit.Y] = !grid[hit.X][hit.Y]
			if !grid[hit.X][hit.Y] {
				// turn off immediately
				pad.Light(hit.X, hit.Y, 0, 0)
			}
		}
	}()

	for {
		for x := 0; x < NumberofHGrids; x++ {
			tick(x)
		}
	}
}