lou
102 lines
3.1 KiB
Python
102 lines
3.1 KiB
Python
"""修复后: 有流但内容为静音/纯音时, 输出端有没有链路自造的噪声。"""
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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 time
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import wave
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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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RATE = 96000
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SILENT = "/tmp/probe_silent.wav"
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TONE = "/tmp/probe_tone.wav"
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REC_S = "/tmp/rec_silent.wav"
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REC_T = "/tmp/rec_tone.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 write_wav(path: str, samples: np.ndarray) -> None:
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data = (np.clip(samples, -1.0, 1.0) * 32767).astype("<i2")
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with wave.open(path, "wb") as fh:
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fh.setnchannels(2)
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fh.setsampwidth(2)
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fh.setframerate(RATE)
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fh.writeframes(np.repeat(data, 2).tobytes())
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def play_record(src: str, dst: str, secs: float) -> None:
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player = subprocess.Popen(["pw-play", "--target", "collaplex_vsink", src],
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stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
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time.sleep(0.35)
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rec = subprocess.Popen(["timeout", str(secs), "pw-record", "--target", sink_name,
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"-P", "{ stream.capture.sink = true }",
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"--rate", str(RATE), "--channels", "2", "--format", "f32", dst],
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stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
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rec.wait(timeout=secs + 8)
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player.terminate()
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player.wait(timeout=5)
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def analyse(path: str, label: str) -> None:
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try:
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_rate, data = wavfile.read(path)
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except (OSError, ValueError):
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print(" %s: 读不到录音" % label)
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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 < 1000:
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print(" %s: 录音太短" % label)
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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(" %-22s RMS %8.2f dBFS | 峰值 %8.2f dBFS" % (
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label, 20 * np.log10(max(rms, 1e-12)), 20 * np.log10(max(peak, 1e-12))))
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sink_name = ""
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def main() -> None:
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global sink_name
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sink_name = find_digital_sink()
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if not sink_name:
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print("找不到数字输出")
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return
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secs = 4.0
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n = int(RATE * secs)
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silent = np.zeros(n)
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tone = 0.1 * np.sin(2 * np.pi * 1000 * np.arange(n) / RATE) # -20 dBFS 纯音
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write_wav(SILENT, silent)
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write_wav(TONE, tone)
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print("数字输出:", sink_name)
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print()
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play_record(SILENT, REC_S, 3.0)
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analyse(REC_S, "播全零素材")
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play_record(TONE, REC_T, 3.0)
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analyse(REC_T, "播 -20dBFS 纯音")
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print()
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print("判据: 播全零时输出应远低于 -90 dBFS(链路不自造噪声);")
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print(" 纯音那一行若有宽频沙沙, RMS 会明显高于纯音本身应有的 -23 dBFS 太多。")
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if __name__ == "__main__":
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main()
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