69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
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"""三点电平测量: 虚拟声卡入口 / HRTF 输入(=归一化输出) / 数字输出。用来定位哪一级没处理。"""
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import array
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import json
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import math
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import subprocess
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import time
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import wave
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RATE = 48000
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DEVNULL = subprocess.DEVNULL
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SRC = "/tmp/h_white.wav"
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def ids() -> dict[str, int]:
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d = json.loads(subprocess.run(["pw-dump"], capture_output=True, text=True).stdout)
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out = {}
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for n in d:
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if n.get("type") != "PipeWire:Interface:Node":
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continue
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p = n.get("info", {}).get("props", {}) or {}
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nm = p.get("node.name") or ""
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if p.get("media.class") == "Audio/Sink":
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if nm == "collaplex_vsink":
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out["vsink"] = n["id"]
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elif nm == "collaplex_hrtf_in":
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out["hrtf_in"] = n["id"]
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elif nm.endswith("iec958-stereo"):
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out["out"] = n["id"]
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elif nm == "alsa_input.usb-EDIFIER_Technology_EDIFIER_Fit900NB_4250315939393214-00.mono-fallback":
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out["mic"] = n["id"]
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return out
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def rec(target: int, secs: float, path: str) -> float:
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r = subprocess.Popen(["pw-record", "--target", str(target), "-P", "{ stream.capture.sink = true }",
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"--rate", str(RATE), "--channels", "2", path], stderr=DEVNULL)
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time.sleep(secs)
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r.terminate()
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r.wait()
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w = wave.open(path)
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n = w.getnframes()
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d = array.array("h")
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d.frombytes(w.readframes(n))
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if not d:
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return -99
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rms = (sum(x * x for x in d) / len(d)) ** 0.5 / 32768
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return 20 * math.log10(rms) if rms > 0 else -99
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ID = ids()
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print("节点 id: %s" % ID)
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print("\n--- 静音时(应 -99 = 抓的是 sink monitor; 若 -50 左右 = 抓到麦克风) ---")
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for k in ("vsink", "hrtf_in", "out", "mic"):
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if k in ID:
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print(" %-8s %.2f dBFS" % (k, rec(ID[k], 1.0, "/tmp/t_%s.wav" % k)))
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print("\n--- 播素材时(素材 -12 dBFS) ---")
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p = subprocess.Popen(["pw-play", "--target", "collaplex_vsink", SRC], stderr=DEVNULL)
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time.sleep(0.5)
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res = {}
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for k in ("vsink", "hrtf_in", "out", "mic"):
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if k in ID:
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res[k] = rec(ID[k], 1.2, "/tmp/p_%s.wav" % k)
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p.terminate()
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p.wait()
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for k, v in res.items():
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print(" %-8s %.2f dBFS" % (k, v))
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