100 lines
2.3 KiB
Python
100 lines
2.3 KiB
Python
import importlib
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from tkinter import Frame, Tk
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import synth
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from pyalsa import Alsa
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SAMPLE_RATE = 44_100
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LATENCY = 50_000 # 50ms
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INT16_MAX = 2**15 - 1
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alsa = Alsa(SAMPLE_RATE, LATENCY)
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keys = "qzsedftgyhujk"
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base_freq = 261.6256 # C4, piano middle C
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keys_map = [0] * len(keys)
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def keydown(e):
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if e.keysym in keys:
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i = keys.index(e.keysym)
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keys_map[i] = 1
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def keyup(e):
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if e.keysym in keys:
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i = keys.index(e.keysym)
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keys_map[i] = 0
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def key_to_freq(i):
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if 0 <= i < len(keys):
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return base_freq * (2 ** (i / 12))
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return 0
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root = Tk()
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# note parameters: freq, volume
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# note state: phase, volume
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class Note:
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def __init__(self):
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self.freq = 0
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self.vol = 0
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self.phase = 0
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self.gain = 0
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self.playing = False
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self.waveform = "sine"
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self.attack = 0.01
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self.release = 0.05
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self.waveshaping = False
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self.lowpass = False
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self.lp = 0
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def reload_synth(event):
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importlib.reload(synth)
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print("reloaded synth module")
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def update(root, note):
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pressed_key = keys_map.index(1) if 1 in keys_map else -1
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note_freq = key_to_freq(pressed_key)
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if note_freq != note.freq:
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note.freq = note_freq
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if not note.playing and note_freq != 0:
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note.playing = True
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if note.playing and note_freq == 0:
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note.playing = False
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buf = synth.synth(note)
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alsa.write(buf) # send sound to alsa
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root.after(0, update, root, note) # schedule next update
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def toggle_note_waveform(e):
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waves = ["sine", "saw", "square", "triangle"]
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current = waves.index(note.waveform)
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note.waveform = waves[(current + 1) % len(waves)]
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print("waveform:", note.waveform)
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def toggle_note_waveshaping(e):
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note.waveshaping = not note.waveshaping
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print("waveshaping:", note.waveshaping)
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def toggle_note_lowpass(e):
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note.lowpass = not note.lowpass
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print("lowpass:", note.lowpass)
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note = Note()
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frame = Frame(root, width=100, height=100)
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frame.bind("<KeyPress>", keydown)
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frame.bind("<KeyRelease>", keyup)
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root.bind_all("<Control-r>", reload_synth)
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root.bind_all("w", toggle_note_waveform)
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root.bind_all("x", toggle_note_waveshaping)
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root.bind_all("c", toggle_note_lowpass)
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frame.pack()
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frame.focus_set()
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root.after(100, update, root, note)
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root.mainloop()
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