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63 lines
1.8 KiB
Python
63 lines
1.8 KiB
Python
#!/usr/bin/env python3
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"""
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Generate WAV fixture files for YIN pitch detection tests.
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Naming convention: <Note><Octave>_<FreqHz>Hz.wav
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e.g. A4_440.0Hz.wav → 440.0 Hz sine wave
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E2_82.41Hz.wav → 82.41 Hz sine wave
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To add more fixtures, just call generate() with the desired note/frequency
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and re-run this script, or drop in your own WAV files following the naming
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convention (16-bit PCM mono, any sample rate ≥ 8000 Hz).
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"""
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import math
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import struct
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import wave
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from pathlib import Path
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FIXTURES_DIR = Path(__file__).parent / "audio" # tests/plugins/tuner/fixtures/audio/
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SAMPLE_RATE = 44100
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DURATION_SEC = 0.5
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AMPLITUDE = 0.8
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FIXTURES = [
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("E2", 82.41),
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("A2", 110.00),
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("D3", 146.83),
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("G3", 196.00),
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("B3", 246.94),
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("E4", 329.63),
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("A4", 440.00),
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]
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def _freq_to_str(hz: float) -> str:
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return f"{hz:.2f}".rstrip("0").rstrip(".")
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def generate(note: str, freq_hz: float, sample_rate: int = SAMPLE_RATE,
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duration_sec: float = DURATION_SEC, amplitude: float = AMPLITUDE) -> Path:
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filename = f"{note}_{_freq_to_str(freq_hz)}Hz.wav"
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path = FIXTURES_DIR / filename
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n = int(sample_rate * duration_sec)
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frames = b"".join(
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struct.pack("<h", int(amplitude * math.sin(2 * math.pi * freq_hz * i / sample_rate) * 32767))
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for i in range(n)
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)
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with wave.open(str(path), "w") as wf:
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wf.setnchannels(1)
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wf.setsampwidth(2)
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wf.setframerate(sample_rate)
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wf.writeframes(frames)
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print(f" wrote {path.name} ({freq_hz} Hz, {n} samples)")
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return path
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if __name__ == "__main__":
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FIXTURES_DIR.mkdir(parents=True, exist_ok=True)
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print(f"Generating {len(FIXTURES)} WAV fixtures in {FIXTURES_DIR}/")
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for note, freq in FIXTURES:
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generate(note, freq)
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print("Done.")
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