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* feat(tracker/midi) Added rudimentary MIDI controller support to the…
… standalone tracker. feat(tracker): add support for a MIDI controller to the standalone tracker Closes #132.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| package gomidi | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/vsariola/sointu/tracker" | ||
| "gitlab.com/gomidi/midi/v2" | ||
| "gitlab.com/gomidi/midi/v2/drivers" | ||
| "gitlab.com/gomidi/midi/v2/drivers/rtmididrv" | ||
| ) | ||
|
|
||
| type ( | ||
| MIDIContext struct { | ||
| driver *rtmididrv.Driver | ||
| inputAvailable bool | ||
| driverAvailable bool | ||
| currentIn MIDIDevicer | ||
| events chan midi.Message | ||
| } | ||
| MIDIDevicer drivers.In | ||
| ) | ||
|
|
||
| func (m *MIDIContext) ListInputDevices() <-chan tracker.MIDIDevicer { | ||
|
|
||
| ins, err := m.driver.Ins() | ||
| channel := make(chan tracker.MIDIDevicer, len(ins)) | ||
| if err != nil { | ||
| m.driver.Close() | ||
| m.driverAvailable = false | ||
| return nil | ||
| } | ||
| go func() { | ||
| for i := 0; i < len(ins); i++ { | ||
| channel <- ins[i].(MIDIDevicer) | ||
| } | ||
| close(channel) | ||
| }() | ||
| return channel | ||
| } | ||
|
|
||
| // Open the driver. | ||
| func CreateContext() *MIDIContext { | ||
| m := MIDIContext{} | ||
| var err error | ||
| m.driver, err = rtmididrv.New() | ||
| m.driverAvailable = err == nil | ||
| if m.driverAvailable { | ||
| m.events = make(chan midi.Message) | ||
| } | ||
| return &m | ||
| } | ||
|
|
||
| // Open an input device while closing the currently open if necessary. | ||
| func (m *MIDIContext) OpenInputDevice(in tracker.MIDIDevicer) bool { | ||
| fmt.Printf("Opening midi device %s\n.", in) | ||
| if m.driverAvailable { | ||
| if m.currentIn == in { | ||
| return false | ||
| } | ||
| if m.inputAvailable && m.currentIn.IsOpen() { | ||
| m.currentIn.Close() | ||
| } | ||
| m.currentIn = in.(MIDIDevicer) | ||
| m.currentIn.Open() | ||
| _, err := midi.ListenTo(m.currentIn, m.HandleMessage) | ||
| if err != nil { | ||
| m.inputAvailable = false | ||
| return false | ||
| } | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| func (m *MIDIContext) HandleMessage(msg midi.Message, timestampms int32) { | ||
| go func() { | ||
| m.events <- msg | ||
| time.Sleep(time.Nanosecond) | ||
| }() | ||
| } | ||
|
|
||
| func (c *MIDIContext) NextEvent() (event tracker.MIDINoteEvent, ok bool) { | ||
| select { | ||
| case msg := <-c.events: | ||
| { | ||
| var channel uint8 | ||
| var velocity uint8 | ||
| var key uint8 | ||
| var controller uint8 | ||
| var value uint8 | ||
| if msg.GetNoteOn(&channel, &key, &velocity) { | ||
| return tracker.MIDINoteEvent{Frame: 0, On: true, Channel: int(channel), Note: key}, true | ||
| } else if msg.GetNoteOff(&channel, &key, &velocity) { | ||
| return tracker.MIDINoteEvent{Frame: 0, On: false, Channel: int(channel), Note: key}, true | ||
| } else if msg.GetControlChange(&channel, &controller, &value) { | ||
| fmt.Printf("CC @ Channel: %d, Controller: %d, Value: %d\n", channel, controller, value) | ||
| } else { | ||
| fmt.Printf("Unhandled MIDI message: %s\n", msg) | ||
| } | ||
| } | ||
| default: | ||
| // Note (@LeStahL): This empty select case is needed to make the implementation non-blocking. | ||
| } | ||
| return tracker.MIDINoteEvent{}, false | ||
| } | ||
|
|
||
| func (c *MIDIContext) BPM() (bpm float64, ok bool) { | ||
| return 0, false | ||
| } | ||
|
|
||
| func (c *MIDIContext) DestroyContext() { | ||
| close(c.events) | ||
| c.currentIn.Close() | ||
| c.driver.Close() | ||
| } |
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