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a9cd4d2207
Author | SHA1 | Date |
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Mattéo Delabre | a9cd4d2207 | |
Mattéo Delabre | 7cbd48b9ad |
Before Width: | Height: | Size: 32 KiB After Width: | Height: | Size: 32 KiB |
Before Width: | Height: | Size: 72 KiB After Width: | Height: | Size: 72 KiB |
22
generate.py
22
generate.py
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@ -1,3 +1,4 @@
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import numpy as np
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import soundbox
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import sys
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@ -10,13 +11,20 @@ Génère un morceau au synthétiseur dans le fichier [output].""")
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output_file = sys.argv[1]
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def sine(dur, freq, value=1):
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def sharp_sine(dur, freq, value=1):
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return soundbox.envelope(
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attack=.01, decay=.2, release=.2,
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signal=soundbox.sine(dur, freq, value))
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attack=.005, decay=.1, release=.1,
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signal=soundbox.sine(dur + .2, freq, value))
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signal = soundbox.silence(10)
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def smooth_sine(dur, freq, value=1):
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return soundbox.envelope(
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attack=.1, decay=.2, release=.1,
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signal=soundbox.sine(dur + .2, freq, value))
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length = 9
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signal = soundbox.silence(length)
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chords_l = (
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(('do', 2),),
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@ -36,11 +44,11 @@ chords_r = (
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(('fa', 3), ('la', 3), ('do', 4)),
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)
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for shift in (.5, 4.5):
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for shift in np.arange(.5, length - 4, 4):
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for i in range(len(chords_l)):
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soundbox.add_signal(signal, start=i / 2 + shift,
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source=soundbox.chord(
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instr=sine, dur=.8 if shift == 4.5 and i == 7 else .4,
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instr=smooth_sine, dur=.6 if shift == 4.5 and i == 7 else .4,
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freqs=soundbox.note_freqs(chords_l[i]),
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value=.4
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))
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@ -48,7 +56,7 @@ for shift in (.5, 4.5):
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for i in range(len(chords_r)):
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soundbox.add_signal(signal, start=i + shift,
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source=soundbox.chord(
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instr=sine, dur=1.1,
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instr=sharp_sine, dur=0.9,
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freqs=soundbox.note_freqs(chords_r[i]),
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value=.4
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))
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123
soundbox.py
123
soundbox.py
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@ -12,24 +12,57 @@ max_val = 2 ** (8 * samp_width - 1) - 1
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samp_rate = 44100
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def add_signal(dest, start, source):
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dest[int(samp_rate * start):int(samp_rate * start) + len(source)] += source
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def silence(dur):
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"""
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Génère un signal silencieux.
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Paramètres:
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dur (float): Durée en secondes
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Retourne:
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(ndarray): Signal généré
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"""
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return np.zeros((int(samp_rate * dur),))
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def sine(dur, freq, value=1):
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"""
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Génère un signal sinusoïdal.
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Paramètres:
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dur (float): Durée en secondes
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freq (float): Fréquence de la sinusoïde en hertz
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value (float): Amplitude du signal (valeur relative entre 0 et 1)
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Retourne:
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(ndarray): Signal généré
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"""
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x = np.arange(int(samp_rate * dur))
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return value * max_val * np.sin(2 * np.pi * freq * x / samp_rate)
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def envelope(attack, decay, release, signal):
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"""
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Applique une enveloppe à une note.
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Paramètres:
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attack (float): Temps d’attaque de la note (en secondes)
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decay (float): Temps de chute de la note vers la phase
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de maintien (en secondes)
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release (float): Temps de relâche à la fin de la note (en secondes)
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signal (ndarray): Signal original
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Retourne:
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(ndarray): Signal généré
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"""
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total = len(signal)
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attack = int(attack * total)
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decay = int(decay * total)
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release = int(release * total)
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attack = int(attack * samp_rate)
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decay = int(decay * samp_rate)
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release = int(release * samp_rate)
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if attack + decay + release > total:
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raise ValueError('Note trop courte pour l’application de l’enveloppe')
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sustain = total - attack - decay - release
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return signal * np.concatenate((
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@ -39,6 +72,46 @@ def envelope(attack, decay, release, signal):
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np.linspace(start=2/3, stop=0, num=release, endpoint=True),
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))
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def add_signal(dest, start, source):
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"""
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Ajoute un signal source dans un autre signal.
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Paramètres:
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dest (ndarray): Signal dans lequel le signal source sera ajouté
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start (float): Temps en secondes à partir duquel le signal est ajouté
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source (ndarray): Signal source
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Retourne: None
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"""
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dest[int(samp_rate * start):int(samp_rate * start) + len(source)] += source
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def chord(instr, dur, freqs, value=1):
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"""
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Construit un accord de notes.
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Paramètres:
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instr (function): Instrument à utiliser pour générer les notes
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dur (float): Durée de chaque note (en secondes)
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freqs (list): Fréquence de chaque note
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value (float): Amplitude totale partagée par les notes
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Retourne:
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(ndarray): Signal généré
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"""
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signal = np.ndarray(0)
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for freq in freqs:
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new_signal = instr(dur, freq, value / len(freqs))
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if len(new_signal) > len(signal):
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signal.resize(len(new_signal))
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signal += new_signal
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return signal
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notes = {
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'do': 0, 'si#': 0,
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'do#': 1, 'reb': 1,
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@ -56,25 +129,34 @@ notes = {
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def note_freq(note, octave):
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"""
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Calcule la fréquence correspondant à une note.
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Paramètres:
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note (str): Nom de la note
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octave (int): Numéro de l’octave
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Retourne:
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(float): Fréquence correspondante en hertz
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"""
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return (440
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* (2 ** (octave - 3))
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* math.pow(2, (notes[note] - 9) / 12))
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def note_freqs(notes):
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"""Calcule la fréquence correspondant à un ensemble de notes."""
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return list(map(lambda info: note_freq(*info), notes))
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def chord(instr, dur, freqs, value=1):
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signal = np.zeros((int(samp_rate * dur),))
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for freq in freqs:
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signal += instr(dur, freq, value / len(freqs))
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return signal
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def save_signal(out_name, signal):
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"""
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Écrit un signal dans un fichier au format WAV.
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Paramètres:
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out_name (str): Chemin vers le fichier
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signal (ndarray): Signal à enregistrer
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"""
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with wave.open(out_name, 'w') as file:
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file.setnchannels(1)
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file.setsampwidth(samp_width)
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@ -83,6 +165,15 @@ def save_signal(out_name, signal):
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def load_signal(in_name):
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"""
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Charge un signal depuis un fichier au format WAV.
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Paramètres:
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in_name (str): Chemin vers le fichier
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Retourne:
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(ndarray): Signal décodé
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"""
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with wave.open(in_name, 'r') as file:
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assert file.getnchannels() == 1
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assert file.getsampwidth() == samp_width
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