lou
82 lines
2.8 KiB
Python
82 lines
2.8 KiB
Python
"""① 块长一对一验证 ② 数字输出底噪测量。"""
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from __future__ import annotations
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import json
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import os
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import subprocess
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import sys
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import numpy as np
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from scipy.io import wavfile
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PROJ = "/home/lou/桌面/工作区/实验/collaplex音效"
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sys.path.insert(0, os.path.join(PROJ, "dsp"))
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import common # noqa: E402
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PY = os.path.join(PROJ, ".venv/bin/python")
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EQ = os.path.join(PROJ, "dsp/eq.py")
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REC = "/tmp/noise_probe.wav"
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def find_digital_sink() -> str:
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raw = subprocess.run(["pw-dump"], capture_output=True, text=True).stdout
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for node in json.loads(raw):
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props = (node.get("info") or {}).get("props") or {}
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name = str(props.get("node.name", ""))
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if props.get("media.class") == "Audio/Sink" and "iec958" in name:
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return name
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return ""
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def block_test() -> None:
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print("=== ① 块长一对一(不等长块不应被填充) ===")
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store = common.open_store()
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for nbytes in (4096, 2048, 1024, 512, 384):
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n = nbytes // 4
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tone = np.sin(2 * np.pi * 1000 * np.arange(n) / 96000.0)
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x = (0.3 * tone).astype("<f4")
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common.write_params(store, [0.0] * 32, 0.0)
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proc = subprocess.run([PY, EQ], input=x.tobytes(), capture_output=True, timeout=60)
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ok = len(proc.stdout) == len(x.tobytes())
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print(" 喂 %5d 字节 -> 出 %5d 字节 %s" % (len(x.tobytes()), len(proc.stdout),
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"✓ 一对一" if ok else "✗ 被填充!"))
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def noise_test(sink: str) -> None:
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print()
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print("=== ② 数字输出底噪(静默 3 秒, 单位 dBFS) ===")
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if not sink:
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print(" 找不到数字输出, 跳过")
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return
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for label, extra in (("静默(无播放)", []),):
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subprocess.run(["timeout", "3", "pw-record", "--target", sink,
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"-P", "{ stream.capture.sink = true }",
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"--rate", "96000", "--channels", "2", "--format", "f32", REC, *extra],
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stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
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try:
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_rate, data = wavfile.read(REC)
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except (OSError, ValueError):
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print(" 录音失败")
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return
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arr = data.astype(np.float64)
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if arr.ndim > 1:
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arr = arr[:, 0]
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if arr.size == 0:
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print(" 空录音")
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return
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rms = float(np.sqrt(np.mean(arr ** 2)))
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peak = float(np.max(np.abs(arr)))
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print(" %-12s RMS %7.2f dBFS | 峰值 %7.2f dBFS | 样点 %d" % (
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label, 20 * np.log10(max(rms, 1e-12)), 20 * np.log10(max(peak, 1e-12)), arr.size))
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print(" (参考: 数字域本底一般应低于 -90 dBFS; 明显高于此值说明链路在自造噪声)")
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def main() -> None:
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block_test()
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noise_test(find_digital_sink())
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if __name__ == "__main__":
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main()
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