Initial commit

audio_python/sound_tkinter.py

@@ -0,0 +1,99 @@
+import importlib
+from tkinter import Frame, Tk
+
+import synth
+from pyalsa import Alsa
+
+SAMPLE_RATE = 44_100
+LATENCY = 50_000  # 50ms
+INT16_MAX = 2**15 - 1
+alsa = Alsa(SAMPLE_RATE, LATENCY)
+
+keys = "qzsedftgyhujk"
+base_freq = 261.6256  # C4, piano middle C
+keys_map = [0] * len(keys)
+
+
+def keydown(e):
+    if e.keysym in keys:
+        i = keys.index(e.keysym)
+        keys_map[i] = 1
+
+
+def keyup(e):
+    if e.keysym in keys:
+        i = keys.index(e.keysym)
+        keys_map[i] = 0
+
+
+def key_to_freq(i):
+    if 0 <= i < len(keys):
+        return base_freq * (2 ** (i / 12))
+    return 0
+
+
+root = Tk()
+
+
+# note parameters: freq, volume
+# note state: phase, volume
+class Note:
+    def __init__(self):
+        self.freq = 0
+        self.vol = 0
+        self.phase = 0
+        self.gain = 0
+        self.playing = False
+        self.waveform = "sine"
+        self.attack = 0.01
+        self.release = 0.05
+        self.waveshaping = False
+        self.lowpass = False
+        self.lp = 0
+
+
+def reload_synth(event):
+    importlib.reload(synth)
+    print("reloaded synth module")
+
+
+def update(root, note):
+    pressed_key = keys_map.index(1) if 1 in keys_map else -1
+    note_freq = key_to_freq(pressed_key)
+    if note_freq != note.freq:
+        note.freq = note_freq
+    if not note.playing and note_freq != 0:
+        note.playing = True
+    if note.playing and note_freq == 0:
+        note.playing = False
+    buf = synth.synth(note)
+    alsa.write(buf)  # send sound to alsa
+    root.after(0, update, root, note)  # schedule next update
+
+
+def toggle_note_waveform(e):
+    waves = ["sine", "saw", "square", "triangle"]
+    current = waves.index(note.waveform)
+    note.waveform = waves[(current + 1) % len(waves)]
+    print("waveform:", note.waveform)
+
+def toggle_note_waveshaping(e):
+    note.waveshaping = not note.waveshaping
+    print("waveshaping:", note.waveshaping)
+
+def toggle_note_lowpass(e):
+    note.lowpass = not note.lowpass
+    print("lowpass:", note.lowpass)
+
+note = Note()
+frame = Frame(root, width=100, height=100)
+frame.bind("<KeyPress>", keydown)
+frame.bind("<KeyRelease>", keyup)
+root.bind_all("<Control-r>", reload_synth)
+root.bind_all("w", toggle_note_waveform)
+root.bind_all("x", toggle_note_waveshaping)
+root.bind_all("c", toggle_note_lowpass)
+frame.pack()
+frame.focus_set()
+root.after(100, update, root, note)
+root.mainloop()