soundbox/generate.py

import soundbox
import sys

if len(sys.argv) != 2:
    print(f"""Utilisation: {sys.argv[0]} [output]

Génère un morceau au synthétiseur dans le fichier [output].""")
    sys.exit(1)

output_file = sys.argv[1]


def sine(dur, freq, value=1):
    return soundbox.envelope(
        attack=.01, decay=.2, release=.2,
        signal=soundbox.sine(dur, freq, value))


signal = soundbox.silence(10)

chords_l = (
    (('do', 2),),
    (('sol', 2),),
    (('la', 2),),
    (('sol', 2),),
    (('do', 2),),
    (('sol', 2),),
    (('la', 2),),
    (('sol', 2),),
)

chords_r = (
    (('do', 3), ('mi', 3), ('sol', 3)),
    (('sol', 3), ('si', 3), ('re', 4)),
    (('la', 3), ('do', 4), ('mi', 4)),
    (('fa', 3), ('la', 3), ('do', 4)),
)

for shift in (.5, 4.5):
    for i in range(len(chords_l)):
        soundbox.add_signal(signal, start=i / 2 + shift,
            source=soundbox.chord(
                instr=sine, dur=.8 if shift == 4.5 and i == 7 else .4,
                freqs=soundbox.note_freqs(chords_l[i]),
                value=.4
            ))

    for i in range(len(chords_r)):
        soundbox.add_signal(signal, start=i + shift,
            source=soundbox.chord(
                instr=sine, dur=1.1,
                freqs=soundbox.note_freqs(chords_r[i]),
                value=.4
            ))

soundbox.save_signal(output_file, signal)