def _chord_to_wave(self, chord_notes):
'''Change lists of notes.Note() objects into numpy arrays of samples.'''
# ring modulation done seperately for each indiv. note
chord_waves = []
for note in chord_notes:
dur = self._timer.samples_per_note(note.dur)
self._total_dur += dur
if note is None or note.dur == 0:
continue
if note.note == notes.REST:
return oscil.Flat(dur=dur)
carrier = self._oscil(note.freq, self._vol, dur=dur)
if self._detune == 1:
modulated_tone = carrier
else:
modulator = self._oscil(note.freq/self._detune, self._vol,
dur=dur)
modulated_tone = mixer.multiply((carrier, modulator))
chord_waves.append(modulated_tone)
return mixer.add(chord_waves)
def metaform_ocd(vol=1, point=None):
'''A short song inspired by a song called OCD, by Metaform:
http://youtu.be/yTDls-QBAmQ
Args:
vol - multiplied by whatever the default is (so it can incr. or decr.)
point - array in shared memory to read points in from the GUI
Returns:
None
'''
time = timing.Timing(bpm=150, def_note_dur=4)
# notes to play
lead_notes = abcp.parse_str(" C ^D G C | ^D ^G G ^D"
" C ^D G C | ^G, ^G G ^D")
bass_intro = list(map(abcp.parse_str, [" C,,/2 C,,/2 | C,,/2 z/2",
"^G,,,/2 ^G,,,/2 | ^G,,,/2 z/2"]))
bass_notes = abcp.parse_str(" C,,/2 C,,/2 | C,,/2 C,,/2 |"
"^G,,,/2 ^G,,,/2 | ^G,,,/2 ^D,,/2 |")
# notes to conditionally play, depending on GUI mouse clicks
# notice that there are 3 alternate sets of notes, but only 4 squares in
# the gui -- this is because the first square represents the default set
# of notes
alt_lead_notes = list(map(abcp.parse_str,
["z ^D' G' z | z ^G' G' z"
"z ^D' G' z | z ^G' G' z'",
"C'' ^D'' G'' C'' | ^D'' ^G'' G'' ^D''"
"C'' ^D'' G'' C'' | ^G' ^G'' G'' ^D''",
"C'' z G'' z | ^D'' z G'' z"
"C'' z G'' z | ^G' z G'' z"]))
# construct playlist (map of notes to instruments/arguments in succession)
lead = functools.partial(BeatingSynth, time, detune=2)
bass = functools.partial(WubBass, time, oscillator='sawtooth')
playlist = [
[[lead, {'notes': lead_notes, 'vol': .3*vol, 'slow_intro': True}]],
[[lead, {'notes': lead_notes, 'vol': .3*vol}]],
[[lead, {'notes': lead_notes, 'vol': .3*vol, 'oscillator': 'square'}]],
[ [lead, {'notes': lead_notes, 'oscillator': 'square', 'vol': .3*vol}],
[bass, {'notes': bass_intro[0], 'tremolo_freq': 100, 'vol': .4*vol}]],
[ [lead, {'notes': lead_notes, 'oscillator': 'square', 'vol': .3*vol}],
[bass, {'notes': bass_intro[1], 'tremolo_freq': 100, 'vol': .4*vol}]],
[ [lead, {'notes': lead_notes, 'oscillator': 'square', 'vol': .3*vol}],
[bass, {'notes': bass_notes, 'slow_intro': True, 'vol': .3*vol}]],
[ [lead, {'notes': lead_notes, 'oscillator': 'square', 'vol': .3*vol}],
[bass, {'notes': bass_notes, 'vol': .3*vol}]],
[[bass, {'notes': bass_notes, 'tremolo_freq': 100, 'vol': .4*vol}]],
[ [lead, {'notes': lead_notes, 'oscillator': 'square', 'vol': .3*vol}],
[bass, {'notes': bass_notes, 'tremolo_freq': 50, 'vol': .45*vol}]],
[ [lead, {'notes': lead_notes, 'oscillator': 'square', 'vol': .3*vol}],
[bass, {'notes': bass_notes, 'tremolo_freq': 100, 'vol': .4*vol}]],
[[lead, {'notes': lead_notes, 'oscillator': 'square', 'vol': .3*vol}]]
]
# play playlist, possibly with procedural changes based on mouse clicks
pa, stream = play.open_stream()
for section in playlist:
if point is not None:
metaform_ocd_procedural_mod(point, section, lead, alt_lead_notes)
#metaform_ocd_procedural_mod(point, section, bass, alt_bass_notes)
waves = (i(**a) for i, a in section)
wave = mixer.add(waves)
play.source(stream, wave)
play.close_stream(pa, stream)