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107 lines
3.5 KiB
107 lines
3.5 KiB
# A primitive drum machine interface for Novation Nocturn.
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#
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# Usage:
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# - make sure that Novation Nocturn is connected *and* that the USB device
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# that corresponds to it can be opened by the current user
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# - create an ini file containing a scene with a single instrument using
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# a sampler or fluidsynth engine + some drum mappings in SFZ or SF2
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# - ensure that the ini file contains 7 drum patterns, pat1..pat7, these
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# can be copied from cboxrc-example
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# - user buttons 1..7 start drum patterns
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# - user button 8 stops the playback
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# - encoder knob 1 adjusts the volume
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# - mixer button exits the application
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import math
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import sys
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sys.path = ["./py"] + sys.path
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import nocturn
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import cbox
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quit = False
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instr_name = cbox.Document.get_scene().status().instruments.keys()[0]
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def clamp(val, min, max):
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if val < min:
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val = min
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elif val > max:
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val = max
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return val
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class NovaBox:
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def __init__(self):
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self.nocturn = nocturn.Nocturn()
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self.cur_pattern = None
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self.handlers = {}
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self.handlers[83] = self.on_xfade_touch
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for i in range(7):
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self.handlers[112 + i] = lambda cmd, val: self.on_buttonN_press(cmd - 112) if val > 0 else None
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self.handlers[112 + 7] = lambda cmd, val: self.on_button8_press() if val > 0 else None
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self.handlers[64] = self.on_knob1_change
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self.handlers[65] = self.on_knob2_change
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self.handlers[127] = lambda cmd, val: self.on_mixer_press() if val > 0 else None
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def on_knob1_change(self, cmd, val):
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scene = cbox.Document.get_scene()
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instr = scene.status().instruments[instr_name][1]
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gain = instr.get_things('/output/1/status', ['gain']).gain
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if val > 63:
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val = -128 + val
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instr.cmd('/output/1/gain', None, gain + val * 0.5)
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def on_knob2_change(self, cmd, val):
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tempo = cbox.GetThings("/master/status", ['tempo'], []).tempo
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if val > 63:
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val = -128 + val
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tempo = clamp(tempo + val * 0.5, 30, 300)
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cbox.do_cmd('/master/set_tempo', None, [tempo])
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def on_buttonN_press(self, button):
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cbox.do_cmd("/master/stop", None, [])
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song = cbox.Document.get_song()
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song.loop_single_pattern(lambda: song.load_drum_pattern('pat%d' % (button + 1)))
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cbox.do_cmd("/master/seek_ppqn", None, [0])
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cbox.do_cmd("/master/play", None, [])
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self.cur_pattern = button
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def on_button8_press(self):
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self.cur_pattern = None
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cbox.do_cmd("/master/stop", None, [])
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def on_mixer_press(self):
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global quit
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quit = True
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def on_xfade_touch(self, cmd, val):
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if val > 0:
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print "Do not touch"
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def handler(self, cmd, val):
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if cmd in self.handlers:
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self.handlers[cmd](cmd, val)
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return
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def poll(self):
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self.nocturn.poll(self.handler)
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def update(self):
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scene = cbox.Document.get_scene()
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cmds = nocturn.NocturnCommands()
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master = cbox.GetThings("/master/status", ['playing'], [])
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for i in range(7):
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cmds.setModeButtonLight(i, self.cur_pattern == i)
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gain = scene.status().instruments[instr_name][1].get_things('/output/1/status', ['gain']).gain
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cmds.setEncoderMode(0, 0)
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cmds.setEncoderValue(0, clamp(int(gain * 2 + 64), 0, 127))
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cmds.setModeButtonLight(7, self.cur_pattern is None)
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self.nocturn.execute(cmds)
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nb = NovaBox()
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while not quit:
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nb.poll()
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nb.update()
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nb.nocturn.reset()
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