Kaede Akino
632d913bb3
Add local Bell and screen-awake controls with per-session bell observation and scene-aware effects. Provide foreground Connection Journey success haptics independent of terminal preferences. Replace the notification sound with an original bell resource, make AudioToolbox completion queue-safe, and group mobile theme settings.
54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
#!/usr/bin/env python3
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"""Generate the original, short system-alert-style bell; no sampled audio is used."""
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import argparse
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import io
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import math
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from pathlib import Path
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import struct
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import wave
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DESTINATION = Path(__file__).resolve().parents[1] / "Frameworks/Resources/bell.wav"
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SAMPLE_RATE = 48_000
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DURATION = 0.22
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def render() -> bytes:
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samples = []
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# A clear fundamental with quickly damped partials, rather than a melody.
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partials = ((1568.0, 1.0, 0.045), (3136.0, 0.18, 0.026), (4312.0, 0.07, 0.018))
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for index in range(round(SAMPLE_RATE * DURATION)):
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time = index / SAMPLE_RATE
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attack = math.sin(min(time / 0.002, 1.0) * math.pi / 2) ** 2
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release = math.sin(min((DURATION - time) / 0.025, 1.0) * math.pi / 2) ** 2
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tone = sum(
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amplitude * math.exp(-time / decay) * math.sin(math.tau * frequency * time)
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for frequency, amplitude, decay in partials
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)
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samples.append(tone * attack * release)
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samples[-1] = 0.0
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gain = 0.28 * 32767 / max(abs(sample) for sample in samples)
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pcm = b"".join(struct.pack("<h", round(sample * gain)) for sample in samples)
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output = io.BytesIO()
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with wave.open(output, "wb") as audio:
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audio.setparams((1, 2, SAMPLE_RATE, len(samples), "NONE", "not compressed"))
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audio.writeframes(pcm)
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return output.getvalue()
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def main() -> None:
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument("--check", action="store_true", help="Verify the checked-in WAV without changing it.")
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args = parser.parse_args()
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audio = render()
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if args.check:
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if not DESTINATION.exists() or DESTINATION.read_bytes() != audio:
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raise SystemExit("bell.wav differs from the generator; run Scripts/generate-bell.py.")
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else:
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DESTINATION.write_bytes(audio)
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if __name__ == "__main__":
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main()
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