melrōse musical expression player

package midi import ( "fmt" "strconv" "github.com/emicklei/melrose/notify" ) func (r *DeviceRegistry) HandleSetting(name string, values []any) error { switch name { case "echo": // i|o id isInput := values[0] == "i" id := values[1].(int) r.toggleEchoNotesForDevice(isInput, id) case "midi.in": if len(values) != 1 { return fmt.Errorf("one argument expected") } id, ok := values[0].(int) if !ok { return fmt.Errorf("integer device argument expected, got %T", values[0]) } _, err := r.Input(id) if err != nil { return fmt.Errorf("bad input device number: %v", err) } r.defaultInputID = id notify.Infof("Set default MIDI input device id: %d", id) case "midi.out.channel": if len(values) != 2 { return fmt.Errorf("two argument expected") } id, ok := values[0].(int) if !ok { return fmt.Errorf("integer device argument expected") } ch, ok := values[1].(int) if !ok { return fmt.Errorf("integer channel argument expected") } out, err := r.Output(id) if err != nil { return fmt.Errorf("bad input device number: %v", err) } out.defaultChannel = ch notify.Infof("Set default MIDI output device id: %d with default channel: %d", id, ch) case "midi.out": if len(values) != 1 { return fmt.Errorf("one argument expected") } id, ok := values[0].(int) if !ok { return fmt.Errorf("integer device argument expected") } out, err := r.Output(id) if err != nil { return fmt.Errorf("bad output device number: %v", err) } r.defaultOutputID = id notify.Infof("Set default MIDI output device id: %d with default channel: %d", id, out.defaultChannel) default: return fmt.Errorf("unknown setting:%s", name) } return nil } // Command is part of melrose.AudioDevice func (r *DeviceRegistry) Command(args []string) notify.Message { if len(args) == 0 { r.printInfoVerbose() return nil } if len(args) == 2 && args[0] == "o" { id, err := strconv.Atoi(args[1]) if err != nil { return notify.NewError(err) } if err := r.HandleSetting("midi.out", []any{id}); err != nil { return notify.NewError(err) } return nil } if len(args) == 2 && args[0] == "i" { id, err := strconv.Atoi(args[1]) if err != nil { return notify.NewError(err) } if err := r.HandleSetting("midi.in", []any{id}); err != nil { return notify.NewError(err) } return nil } if args[0] == "e" { if len(args) != 3 { return notify.NewErrorf("missing `i` or `o` and device number") } if args[1] != "i" && args[1] != "o" { return notify.NewErrorf("first parameter is either `i` for input or `o` for output") } id, err := strconv.Atoi(args[2]) if err != nil { return notify.NewError(err) } r.HandleSetting("echo", []any{args[1], id}) return nil } if len(args) == 1 && args[0] == "r" { fmt.Println("Reset MIDI device configuration. Stopping all listeners") r.Reset() r.Close() r.init() } return notify.NewErrorf("unknown command:%v", args) } func (r *DeviceRegistry) printInfo() { r.streamRegistry.transport.PrintInfo(r.defaultInputID, r.defaultOutputID) } func (r *DeviceRegistry) printInfoVerbose() { r.printInfo() notify.PrintHighlighted("default settings:") deviceIn, err := r.Input(r.defaultInputID) if err == nil { fmt.Printf(" input device = %d, echo = %v\n", r.defaultInputID, deviceIn.echo) } else { fmt.Printf(" no input device\n") } deviceOut, err := r.Output(r.defaultOutputID) if err == nil { fmt.Printf("output device = %d, channel = %d, echo = %v\n", r.defaultOutputID, deviceOut.defaultChannel, deviceOut.echo) } else { fmt.Printf(" no output device (restart?)\n") } fmt.Println() notify.PrintHighlighted("how to change:") fmt.Println("set('midi.in', <device-id>) --- change the default MIDI input device id (or use e.g. \":m i 1\")") fmt.Println("set('midi.out',<device-id>) --- change the default MIDI output device id (or use e.g. \":m o 1\")") fmt.Println("set('midi.out.channel',<device-id>,<nr>) --- change the default MIDI channel for an output device id") fmt.Println(":e i <device-id> --- toggle printing the MIDI notes from input device id") fmt.Println(":e o <device-id> --- toggle printing the MIDI notes to output device id") } func (r *DeviceRegistry) toggleEchoNotesForDevice(isInput bool, deviceID int) { if isInput { in, ok := r.in[deviceID] if !ok { notify.Errorf("no device found with id:%d", deviceID) return } in.echo = !in.echo if in.echo { in.listener.Add(DefaultEchoListener) in.listener.Start() } else { in.listener.Remove(DefaultEchoListener) // each.listener.Stop() } notify.Infof("echo input notes from device %d (%s) is enabled: %v", in.id, in.name, in.echo) } else { out, ok := r.out[deviceID] if !ok { notify.Errorf("no device found with id:%d", deviceID) return } out.echo = !out.echo notify.Infof("echo output notes from device %d (%s) is enabled: %v", out.id, out.name, out.echo) } }