61 lines
2.0 KiB
Python
61 lines
2.0 KiB
Python
 
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"""Synthesises the Player's two cue sounds into assets/sounds/ (standard library only).
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- stretching_cue.wav: a soft singing bowl, slow attack, long gentle decay.
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- workout_cue.wav: a short, muted wooden "tok".
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Both are kept quiet (peak about -12 dBFS) so they sit under the user's music.
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"""
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import math
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import random
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import struct
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import wave
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from pathlib import Path
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RATE = 22050
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def write(path: Path, samples: list[float]) -> None:
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peak = max(abs(s) for s in samples) or 1.0
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scale = 0.25 / peak # about -12 dBFS
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with wave.open(str(path), "wb") as out:
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out.setnchannels(1)
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out.setsampwidth(2)
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out.setframerate(RATE)
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out.writeframes(b"".join(struct.pack("<h", int(s * scale * 32767)) for s in samples))
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def singing_bowl(seconds: float = 2.6) -> list[float]:
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# Inharmonic partials of a bowl, each fading at its own pace, with a slight beat.
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partials = [(392.0, 1.0, 1.4), (393.2, 0.6, 1.5), (1062.0, 0.35, 0.8), (2010.0, 0.12, 0.45)]
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samples = []
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for n in range(int(seconds * RATE)):
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t = n / RATE
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attack = min(1.0, t / 0.04)
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value = sum(a * math.exp(-t / decay) * math.sin(2 * math.pi * f * t) for f, a, decay in partials)
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samples.append(attack * value)
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return samples
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def wood_tok(seconds: float = 0.12) -> list[float]:
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rng = random.Random(7)
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samples = []
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for n in range(int(seconds * RATE)):
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t = n / RATE
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body = math.exp(-t / 0.018) * (math.sin(2 * math.pi * 820 * t) + 0.4 * math.sin(2 * math.pi * 1640 * t))
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click = math.exp(-t / 0.002) * (rng.random() * 2 - 1) * 0.3
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samples.append(body + click)
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return samples
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def main() -> None:
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out = Path(__file__).resolve().parents[2] / "assets" / "sounds"
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out.mkdir(parents=True, exist_ok=True)
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write(out / "stretching_cue.wav", singing_bowl())
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write(out / "workout_cue.wav", wood_tok())
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for f in sorted(out.glob("*.wav")):
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print(f"{f.name}: {f.stat().st_size / 1000:.0f} kB")
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if __name__ == "__main__":
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main()
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