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from midi_wrapper_mido import MidiWrapper
class MidiController:
DEVICE_NAME = "Launchpad Mini MIDI 1"
LIGHT_CONTROL_CHANNEL = 0
LED_GREEN = 124
LED_YELLOW = 126
LED_RED = 3
LED_OFF = 0
BUTTON_MATRIX = [[x for x in range(y * 16, y * 16 + 8)] for y in range(0,8)] # address as [row][col]
MIN_PLAYBACK_RATE = 0.5
MAX_PLAYBACK_RATE = 1.2
PLAYBACK_RATE_STEP = 0.1
MIN_PLAYBACK_VOLUME = 0.5
MAX_PLAYBACK_VOLUME = 1.2
PLAYBACK_VOLUME_STEP = 0.1
def __init__(self, soloTool, midiWrapperOverride=None):
self._soloTool = soloTool
if midiWrapperOverride is not None:
self._midiWrapper = midiWrapperOverride
else:
self._midiWrapper = MidiWrapper()
self._registerHandlers()
self._soloTool.registerPlayingStateCallback(self._updatePlayPauseButton)
self._soloTool.registerPlaybackVolumeCallback(self._updateVolumeRow)
self._soloTool.registerPlaybackRateCallback(self._updateRateRow)
def _registerHandlers(self):
self._handlers = {
96 : self._stop,
112 : self._playPause,
101 : self._soloTool.jumpToA,
102 : self._soloTool.previousStoredAbLimits,
103 : self._soloTool.nextStoredAbLimits,
118 : self._soloTool.previousSong,
119 : self._soloTool.nextSong
}
for i in range(0, 8):
volume = round(MidiController.MIN_PLAYBACK_VOLUME + MidiController.PLAYBACK_VOLUME_STEP * i, 1)
self._handlers[i] = self._createSetPlaybackVolumeCallback(volume)
for i, button in enumerate(range(16, 24)):
rate = round(MidiController.MIN_PLAYBACK_RATE + MidiController.PLAYBACK_RATE_STEP * i, 1)
self._handlers[button] = self._createSetPlaybackRateCallback(rate)
def connect(self):
self._midiWrapper.setCallback(self._callback)
self._midiWrapper.connect(MidiController.DEVICE_NAME)
self._initialiseButtonLEDs()
def _callback(self, msg):
if msg.type != "note_on" or msg.velocity < 127:
return
if msg.note in self._handlers:
handler = self._handlers[msg.note]()
def _playPause(self):
if self._soloTool.isPlaying():
self._soloTool.pause()
else:
self._soloTool.play()
def _stop(self):
self._soloTool.stop()
def _updatePlayPauseButton(self):
if self._soloTool.isPlaying():
self._setButtonLED(7, 0, MidiController.LED_GREEN)
else:
self._setButtonLED(7, 0, MidiController.LED_YELLOW)
def _updateVolumeRow(self):
volume = self._soloTool.getPlaybackVolume()
t1 = int(round(volume / MidiController.PLAYBACK_VOLUME_STEP, 1))
t2 = int(round(MidiController.MIN_PLAYBACK_VOLUME / MidiController.PLAYBACK_VOLUME_STEP, 1))
lastColumnLit = t1 - t2 + 1
self._lightRowUntilColumn(0, lastColumnLit, MidiController.LED_GREEN)
def _updateRateRow(self):
rate = self._soloTool.getPlaybackRate()
t1 = int(round(rate / MidiController.PLAYBACK_RATE_STEP, 1))
t2 = int(round(MidiController.MIN_PLAYBACK_RATE / MidiController.PLAYBACK_RATE_STEP, 1))
lastColumnLit = t1 - t2 + 1
self._lightRowUntilColumn(1, lastColumnLit, MidiController.LED_YELLOW)
def _createSetPlaybackRateCallback(self, rate):
def f():
self._soloTool.setPlaybackRate(rate)
return f
def _createSetPlaybackVolumeCallback(self, volume):
def f():
self._soloTool.setPlaybackVolume(volume)
return f
def _setButtonLED(self, row, col, colour):
self._midiWrapper.sendMessage(MidiController.BUTTON_MATRIX[row][col], colour, MidiController.LIGHT_CONTROL_CHANNEL)
def _lightRowUntilColumn(self, row, column, litColour):
colours = [litColour] * column + [MidiController.LED_OFF] * (8 - column)
for col in range(0, 8):
self._setButtonLED(row, col, colours[col])
def _allLEDsOff(self):
for row in range(0, 8):
for col in range(0, 8):
self._setButtonLED(row, col, MidiController.LED_OFF)
def _initialiseButtonLEDs(self):
self._allLEDsOff()
# volume buttons
self._updateVolumeRow()
# playback rate buttons
self._updateRateRow()
# playback control
self._setButtonLED(6, 0, MidiController.LED_RED)
self._updatePlayPauseButton()
# AB control
self._setButtonLED(6, 5, MidiController.LED_YELLOW)
self._setButtonLED(6, 6, MidiController.LED_RED)
self._setButtonLED(6, 7, MidiController.LED_GREEN)
# Song control
self._setButtonLED(7, 6, MidiController.LED_RED)
self._setButtonLED(7, 7, MidiController.LED_GREEN)
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