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2026-10-19 02:30:43 +00:00 · 2026-10-06 19:01:05 +08:00
commit b705216e4a
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+# -*- coding: utf-8 -*-
+"""量一下被控端的实际性能，别凭感觉优化。
+
+要测：
+    1. 截屏一帧要多久（不同质量/宽度）
+    2. 编码一帧要多久
+    3. 空闲时 CPU / 内存
+    4. 各种质量档位下的字节数（影响传输耗时）
+"""
+from __future__ import annotations
+
+import io
+import os
+import statistics
+import sys
+import time
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(ROOT / "windows"))
+
+import psutil  # noqa: E402
+
+
+def bench_capture(quality: int, width: int, rounds: int = 12):
+    from PIL import ImageGrab
+    times = []
+    sizes = []
+    for _ in range(rounds):
+        start = time.perf_counter()
+        shot = ImageGrab.grab()
+        if width and shot.width > width:
+            ratio = width / shot.width
+            shot = shot.resize((width, int(shot.height * ratio)),
+                               ImageGrab.grab().resize.__self__.__class__ and 1
+                               or 1)
+        buffer = io.BytesIO()
+        shot.convert("RGB").save(buffer, format="JPEG", quality=quality)
+        times.append((time.perf_counter() - start) * 1000)
+        sizes.append(len(buffer.getvalue()))
+    return times, sizes
+
+
+def bench_resize_and_encode(quality: int, width: int, rounds: int = 12):
+    """先截一次，反复测 缩放+编码 的耗时（隔离出真正的开销）。"""
+    from PIL import Image, ImageGrab
+    base = ImageGrab.grab()
+    times = []
+    sizes = []
+    for _ in range(rounds):
+        start = time.perf_counter()
+        shot = base
+        if width and base.width > width:
+            ratio = width / base.width
+            shot = base.resize((width, int(base.height * ratio)), Image.LANCZOS)
+        buffer = io.BytesIO()
+        shot.convert("RGB").save(buffer, format="JPEG", quality=quality)
+        times.append((time.perf_counter() - start) * 1000)
+        sizes.append(len(buffer.getvalue()))
+    return times, sizes
+
+
+def main() -> int:
+    from PIL import Image
+
+    screen = Image.new("RGB", (1, 1))
+    try:
+        from PIL import ImageGrab
+        base = ImageGrab.grab()
+        screen = base
+    except Exception as exc:                              # noqa: BLE001
+        print(f"  截屏失败: {exc}")
+        return 1
+
+    print(f"  屏幕: {screen.width}x{screen.height}")
+    proc = psutil.Process(os.getpid())
+    print(f"  基准进程内存: {proc.memory_info().rss / 1024 / 1024:.1f} MB")
+    print()
+
+    print("=" * 66)
+    print("  一、纯截屏耗时（ImageGrab）")
+    print("=" * 66)
+    times = []
+    for _ in range(15):
+        start = time.perf_counter()
+        ImageGrab.grab()
+        times.append((time.perf_counter() - start) * 1000)
+    times.sort()
+    print(f"  平均 {statistics.mean(times):6.1f} ms   中位 {statistics.median(times):6.1f} ms   "
+          f"最快 {times[0]:6.1f}   最慢 {times[-1]:6.1f}")
+    print(f"  -> 理论上限约 {1000 / statistics.median(times):.1f} 帧/秒")
+
+    print()
+    print("=" * 66)
+    print("  二、缩放 + JPEG 编码耗时（截屏不算）")
+    print("=" * 66)
+    print(f"  {'宽度':>6} {'质量':>5} {'中位耗时':>10} {'大小':>10} {'理论帧率':>10}")
+    for width in (0, 1280, 960, 800):
+        for quality in (75, 55, 40):
+            t, s = bench_resize_and_encode(quality, width)
+            median = statistics.median(t)
+            print(f"  {str(width or '原始'):>6} {quality:>5} {median:>9.1f}ms "
+                  f"{statistics.mean(s) / 1024:>9.1f}KB {1000 / median:>9.1f}")
+
+    print()
+    print("=" * 66)
+    print("  三、整条链路（截屏 + 缩放 + 编码）")
+    print("=" * 66)
+    for width, quality in ((0, 75), (1280, 75), (960, 60), (800, 50)):
+        t, s = bench_capture(quality, width)
+        median = statistics.median(t)
+        print(f"  宽度 {str(width or '原始'):>5} 质量 {quality:>3}: "
+              f"{median:>7.1f}ms/帧 -> {1000 / median:>5.1f} 帧/秒, "
+              f"{statistics.mean(s) / 1024:.0f}KB/帧, "
+              f"{statistics.mean(s) / 1024 * 1000 / median * 8 / 1000:.1f} Mbps")
+
+    print()
+    print("=" * 66)
+    print("  四、当前默认设置是多少")
+    print("=" * 66)
+    from lanremote.config import Store
+    import tempfile
+    store = Store(Path(tempfile.mkdtemp()))
+    for key in ("image_width", "image_quality", "screen_fps",
+                "screen_quality", "screen_width", "screen_scale"):
+        value = store.get(key)
+        if value is not None:
+            print(f"  {key} = {value}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())