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Hold-to-sustain keyboard: ignore repeats, release on key-up timeout

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Tracks held keys. OS keyboard repeat is ignored (same key refreshes
timer). Note releases 150ms after last repeat stops — approximates
key-up detection. All notes released on Esc.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Kenneth Reitz
2026-03-29 20:31:29 -04:00
parent 5f94e1939b
commit 970c730012
1 changed files with 22 additions and 21 deletions
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test_live.py
+22 -21
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@@ -158,6 +158,7 @@ class LiveTUI:
tab_idx = -1
tab_prefix = ""
self.kbd_active = False
self._kbd_held = {} # key → last_press_time
while self.running:
try:
@@ -353,6 +354,10 @@ class LiveTUI:
# KEYBOARD MODE: all keys go to MIDI
if self.kbd_active:
if ch == 27: # Escape exits keyboard mode
# Release all held notes
for k in list(self._kbd_held):
self.engine.keyboard_note(k, on=False)
self._kbd_held.clear()
self.kbd_active = False
self.engine._keyboard_channel = None
self.log("Keyboard off (Esc)", 3)
@@ -364,28 +369,24 @@ class LiveTUI:
self.log(f"Octave ↓ {self.engine._keyboard_octave}", 2)
elif 32 <= ch < 127:
key = chr(ch).lower()
played = self.engine.keyboard_note(key, on=True)
if played:
ch_num = self.engine._keyboard_channel
if ch_num in self.engine.channels:
channel = self.engine.channels[ch_num]
nv = len(channel.voices)
vol = channel.volume
lv = channel.level
# Check if wavetable has audio
cache_peek = ""
if channel._cache:
first_wave = next(iter(channel._cache.values()))
peak = abs(first_wave).max()
cache_peek = f" wpeak={peak:.3f}"
stream_ok = "stream:OK" if self.engine._stream and self.engine._stream.active else "stream:OFF"
self.log(f" key:{key} v={nv} vol={vol} lv={lv:.3f}{cache_peek} {stream_ok}", 2)
def _off(k=key):
time.sleep(0.25)
self.engine.keyboard_note(k, on=False)
threading.Thread(target=_off, daemon=True).start()
now = time.time()
if key in self._kbd_held:
# Key repeat — just refresh the timer
self._kbd_held[key] = now
else:
self.log(f" unmapped:{key}", 3)
# New key press
played = self.engine.keyboard_note(key, on=True)
if played:
self._kbd_held[key] = now
# Release keys that haven't been pressed for 150ms
now = time.time()
expired = [k for k, t in self._kbd_held.items()
if now - t > 0.15]
for k in expired:
self.engine.keyboard_note(k, on=False)
del self._kbd_held[k]
continue
if ch == 10 or ch == 13: