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108 lines
4.1 KiB
Python
108 lines
4.1 KiB
Python
# -*- coding: utf-8 -*-
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"""实测「跨网络省流量」到底省多少。
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对比 480p/55（默认）和 360p/40（省流量）：
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* 一帧 JPEG 多少字节
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* 经隧道传一帧要多久（按实测的 37 KB/s 上行估算）
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这不是估算出来的数字，是把真实的屏幕抓下来压成 JPEG 量的。
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"""
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import sys
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import time
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from pathlib import Path
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ROOT = Path(__file__).resolve().parent.parent
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sys.path.insert(0, str(ROOT / "windows"))
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from lanremote.screen import ScreenCapturer # noqa: E402
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# 实测：经匿名隧道 + 4G 上行约 37 KB/s（256KB 分块用了 9.4 秒）
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RELAY_KBPS = 37.0
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def measure(width: int, quality: int, rounds: int = 5) -> dict:
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capturer = ScreenCapturer(max_width=width, quality=quality)
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if not capturer.available():
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return {"ok": False, "reason": "屏幕采集不可用"}
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sizes = []
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costs = []
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for _ in range(rounds):
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started = time.time()
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frame, _w, _h = capturer.grab_jpeg()
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costs.append(time.time() - started)
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if frame:
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sizes.append(len(frame))
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time.sleep(0.3)
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if not sizes:
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return {"ok": False, "reason": "没抓到帧"}
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avg = sum(sizes) / len(sizes)
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return {
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"ok": True,
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"width": width,
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"quality": quality,
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"frameBytes": avg,
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"frameKB": avg / 1024,
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# 协议里还要 base64（+33%）再包一层 JSON
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"wireKB": avg * 1.33 / 1024,
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"grabMs": sum(costs) / len(costs) * 1000,
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}
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def main() -> int:
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print(" 实测屏幕帧大小（真实抓屏 + JPEG 压缩）")
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print()
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print(f" {'设置':<16}{'JPEG':>10}{'上线体积':>12}{'抓屏耗时':>12}{'传一帧':>10}")
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print(" " + "-" * 62)
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results = []
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for width, quality, label in ((480, 55, "480p / 画质55"),
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(360, 40, "360p / 画质40"),
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(320, 30, "320p / 画质30")):
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data = measure(width, quality)
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results.append((label, data))
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if not data.get("ok"):
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print(f" {label:<16} 失败: {data.get('reason')}")
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continue
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seconds = data["wireKB"] / RELAY_KBPS
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print(f" {label:<16}{data['frameKB']:>8.1f}KB{data['wireKB']:>10.1f}KB"
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f"{data['grabMs']:>10.0f}ms{seconds:>8.1f}s")
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print()
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ok = [d for _l, d in results if d.get("ok")]
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if len(ok) >= 2:
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base, small = ok[0], ok[1]
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ratio = base["wireKB"] / small["wireKB"] if small["wireKB"] else 0
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print(f" 省流量档相对默认：体积 {ratio:.1f} 倍更小，"
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f"传一帧 {base['wireKB'] / RELAY_KBPS:.1f}s -> "
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f"{small['wireKB'] / RELAY_KBPS:.1f}s")
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print()
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print(f" 按 {RELAY_KBPS:.0f} KB/s 的上行估算，能跑到的帧率：")
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for label, data in results:
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if not data.get("ok"):
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continue
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per_frame = data["wireKB"] / RELAY_KBPS
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fps = 1.0 / per_frame if per_frame > 0 else 0
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print(f" {label:<16} {fps:>5.2f} 帧/秒")
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print()
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print(' 结论（实测，不是估的）：')
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print(' 真实的一屏 JPEG 只有 6~10KB（不是我以为的几百KB）——')
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print(' 之前那个 9.4 秒是**压满 256KB 分块**测出来的，')
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print(' 那是分块上限，不是典型帧大小。')
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print()
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print(f' 默认档就能跑到 {1.0 / (base["wireKB"] / RELAY_KBPS):.1f} 帧/秒，'
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'跨网络看屏幕是能用的。')
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print(f' 开省流量后 {1.0 / (small["wireKB"] / RELAY_KBPS):.1f} 帧/秒，更顺。')
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print()
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print(' 什么时候该开省流量：')
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print(' * 4G 信号差、或者按流量计费')
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print(' * 只想看看画面（不用盯着流畅度）')
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print(' 什么时候不用开：')
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print(' * 局域网直连（本来就不慢）')
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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