melrōse musical expression player

//go:build wasm // +build wasm package transport import ( "syscall/js" "github.com/emicklei/melrose/notify" ) func init() { Initializer = wasmInitialize } func wasmInitialize() { if notify.IsDebug() { notify.Debugf("transport.init: use WASMmidiTransporter") } Factory = func() Transporter { return WASMmidiTransporter{} } } type WASMmidiTransporter struct{} func (t WASMmidiTransporter) HasInputCapability() bool { return true } func (t WASMmidiTransporter) PrintInfo(inID, outID int) { } func (t WASMmidiTransporter) DefaultOutputDeviceID() int { return 0 } func (t WASMmidiTransporter) DefaultInputDeviceID() int { return 0 } func (t WASMmidiTransporter) NewMIDIOut(id int) (MIDIOut, error) { return WASMMidiOut{id: id}, nil } func (t WASMmidiTransporter) NewMIDIIn(id int) (MIDIIn, error) { return WASMMidiIn{id: id}, nil } func (t WASMmidiTransporter) NewMIDIListener(m MIDIIn) MIDIListener { return &WASMListener{ mListener: newMListener(), } } type WASMMidiOut struct { id int } func (m WASMMidiOut) WriteShort(status int64, data1 int64, data2 int64) error { // MIDI_send(deviceID, status, pitch, velocity) js.Global().Call("melrose_send", m.id, uint8(status), uint8(data1), uint8(data2)) return nil } func (m WASMMidiOut) Close() error { return nil } type WASMMidiIn struct { id int } func (m WASMMidiIn) Close() error { return nil } type WASMListener struct { *mListener } func (l *WASMListener) Start() { l.mutex.Lock() defer l.mutex.Unlock() if l.listening { return } l.listening = true } func (l *WASMListener) Stop() { l.mutex.Lock() defer l.mutex.Unlock() if l.listening { return } l.listening = false } func (l *WASMListener) HandleMIDIMessage(status int16, nr int, data2 int) { if !l.listening { return } l.mListener.HandleMIDIMessage(status, nr, data2) }