melrōse musical expression player

package control import ( "fmt" "time" "github.com/emicklei/melrose/core" "github.com/emicklei/melrose/midi" "github.com/emicklei/melrose/notify" ) const ( noteOn int64 = 0x90 // 10010000 , 144 noteOff int64 = 0x80 // 10000000 , 128 ) type OnOff struct { isOn bool deviceID int channel int note core.Note } func NewOnOff(deviceID int, channel int, note core.Note) OnOff { return OnOff{ isOn: false, deviceID: deviceID, channel: channel, note: note, } } // Play implements Playable func (o OnOff) Play(ctx core.Context, at time.Time) error { if notify.IsDebug() { notify.Debugf("control.OnOff.Play dev=%d ch=%d note=%v", o.deviceID, o.channel, o.note) } return o.send(ctx, noteOn) } func (o OnOff) send(ctx core.Context, status int64) error { nr := o.note.MIDI() velocity := o.note.Velocity mm := midi.NewMessage( ctx.Device(), core.On(o.deviceID), int(status), core.On(o.channel), core.On(nr), core.On(velocity)) return mm.Evaluate(ctx) } // Stop implements Playable func (o OnOff) Stop(ctx core.Context) error { if notify.IsDebug() { notify.Debugf("control.OnOff.Stop dev=%d ch=%d note=%v", o.deviceID, o.channel, o.note) } return o.send(ctx, noteOff) } // Storex is part of core.Storable func (o OnOff) Storex() string { return fmt.Sprintf("onoff(device(%d,channel(%d,%s)))", o.deviceID, o.channel, core.Storex(o.note)) }