func findMidiInputDevice(name string) portmidi.DeviceId {
devcount := portmidi.CountDevices()
for i := 0; i < devcount; i++ {
id := portmidi.DeviceId(i)
info := portmidi.GetDeviceInfo(id)
if info.IsInputAvailable {
if info.Name == name {
return id
}
}
}
return portmidi.DeviceId(-1)
}
func listDevices() {
n := portmidi.CountDevices()
for i := 0; i < n; i++ {
info := portmidi.GetDeviceInfo(portmidi.DeviceId(i))
fmt.Printf("Device %d: %v\n", i, info)
}
}
func initMidi() {
s, err := portmidi.NewInputStream(portmidi.DeviceId(*midiDevice), 1024)
if err != nil {
log.Println(err)
return
}
go midiLoop(s)
}
func getDeviceId() (portmidi.DeviceId, error) {
total := portmidi.CountDevices()
for id := 0; id < total; id++ {
id := portmidi.DeviceId(id)
info := portmidi.GetDeviceInfo(id)
if info.Name == "MicroBrute" && info.IsOutputAvailable {
return id, nil
}
}
return -1, fmt.Errorf("MicroBrute not found")
}
// discovers the currently connected LaunchControl 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.GetDeviceInfo(portmidi.DeviceId(i))
if strings.Contains(info.Name, "Launch Control XL") {
if info.IsInputAvailable {
in = i
}
if info.IsOutputAvailable {
out = i
}
}
}
if in == -1 || out == -1 {
err = errors.New("launchcontrol: no launch control is connected")
} else {
input = portmidi.DeviceId(in)
output = portmidi.DeviceId(out)
}
return
}
func initPortMidi() *portmidi.Stream {
portmidi.Initialize()
deviceCount := portmidi.CountDevices()
fmt.Println("Number of MIDI devices: ", deviceCount)
dev := portmidi.DeviceId(3 - 1)
for i := 0; i < deviceCount; i++ {
id := portmidi.DeviceId(i)
fmt.Println("Index ", i, "Id", id, " Device ", *portmidi.GetDeviceInfo(id))
}
out, err := portmidi.NewOutputStream(dev, 0, 0)
if err == nil {
fmt.Println("used device info: ", *portmidi.GetDeviceInfo(dev))
} else {
fmt.Println("Error: ", err)
os.Exit(2)
}
return out
}
func run() error {
s, err := portmidi.NewOutputStream(portmidi.DeviceId(*deviceN), 1024, 0)
if err != nil {
return err
}
defer s.Close()
ls := &lockedStream{s: s}
quit := make(chan bool)
spd := 1000 * time.Millisecond
n1 := make(chan Note)
g1 := generator{
minN: 48, maxN: 72,
minD: spd,
maxD: 4 * spd,
stepD: spd / 8,
scale: dorian,
ringLen: 16,
noteP: 4,
timeP: 2,
switchP: 16,
}
go g1.run(n1, quit)
go play(ls, 2, n1, quit)
n2 := make(chan Note)
g2 := generator{
minN: 36, maxN: 60,
minD: 4 * spd,
maxD: 16 * spd,
stepD: spd,
scale: dorian,
ringLen: 4,
noteP: 2,
timeP: 2,
switchP: 4,
}
go g2.run(n2, quit)
go play(ls, 3, n2, quit)
b := make([]byte, 1)
os.Stdin.Read(b)
close(quit)
time.Sleep(time.Second)
return nil
}
func findMidiOutputDevice(name string) (portmidi.DeviceId, string) {
devcount := portmidi.CountDevices()
for i := 0; i < devcount; i++ {
id := portmidi.DeviceId(i)
info := portmidi.GetDeviceInfo(id)
if info.IsOutputAvailable {
if info.Name == name {
return id, info.Name
}
}
}
id := portmidi.GetDefaultOutputDeviceId()
info := portmidi.GetDeviceInfo(id)
return id, info.Name
}
func initMidi() {
device := portmidi.DeviceId(*midiDevice)
if device == -1 {
device = portmidi.GetDefaultInputDeviceId()
}
s, err := portmidi.NewInputStream(device, 1024)
if err != nil {
log.Println(err)
return
}
if s == nil {
log.Println("could not initialize MIDI input device")
return
}
go midiLoop(s)
}
// renderMidi reads a midi device, converts it to a live sound, and renders the waveform to screen.
func renderMidi() {
fmt.Println("Loading portmidi...")
pm.Initialize()
midi := s.NewMidiInput(pm.DeviceId(3)) // ++See below
fmt.Printf("Rendering midi...\n")
// Render the generated sine wave to screen:
output.Render(midi, 2000, 500)
// ...or, play it live:
// output.Play(midi)
/*
++ Note: to find your device id, use a version of this:
for i := 1; i <= pm.CountDevices(); i++ {
fmt.Printf("Reading device: %d\n", i)
di := pm.GetDeviceInfo(pm.DeviceId(i))
fmt.Printf("Info = %v\n", di)
}
*/
}
func deviceID(idint int) portmidi.DeviceId {
return portmidi.DeviceId(idint)
}
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.New(); 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)
}
}
}
