修复音频延迟过高的问题

UntamedMusicPlayer/Playback/AudioPerformanceGuardian.cs

@@ -13,10 +13,32 @@ public static class AudioPerformanceGuardian
     private static readonly long _totalMemoryGb = GetTotalMemoryGb();
     private static readonly DevicePerformanceTier _staticTier = AssessStaticTier();
 
+    private static long _lastGcIndex = -1;
+    private static DateTime _lastGcTimestamp = DateTime.MinValue;
+    private static double _lastGcPauseMs = 0;
+
+    private static float _recommendedBuffer;
+    private static float _recommendedPeriod;
+    private static readonly Timer _timer;
+
+    static AudioPerformanceGuardian()
+    {
+        RefreshSettings();
+        _timer = new Timer(
+            _ => RefreshSettings(),
+            null,
+            TimeSpan.FromSeconds(10),
+            TimeSpan.FromSeconds(10)
+        );
+    }
+
     /// <summary>
     /// 获取音频配置建议
     /// </summary>
-    public static (float Buffer, float Period) GetRecommendedSettings()
+    public static (float Buffer, float Period) GetRecommendedSettings() =>
+        (_recommendedBuffer, _recommendedPeriod);
+
+    private static void RefreshSettings()
     {
         var (isUnderHeavyPressure, gcPauseMs) = GetRuntimePressure();
 
@@ -24,15 +46,18 @@ public static class AudioPerformanceGuardian
         if (isUnderHeavyPressure)
         {
             var period = ((float)gcPauseMs + 50) / 1000;
-            return (period * 4, period); // 极度保守模式
+            _recommendedBuffer = period * 4;
+            _recommendedPeriod = period;
         }
-
-        return _staticTier switch
+        else
         {
-            DevicePerformanceTier.Pro => (0.16f, 0.04f),
-            DevicePerformanceTier.Balanced => (0.25f, 0.0625f),
-            _ => (0.4f, 0.1f),
-        };
+            (_recommendedBuffer, _recommendedPeriod) = _staticTier switch
+            {
+                DevicePerformanceTier.Pro => (0.16f, 0.04f),
+                DevicePerformanceTier.Balanced => (0.25f, 0.0625f),
+                _ => (0.4f, 0.1f),
+            };
+        }
     }
 
     private static DevicePerformanceTier AssessStaticTier()
@@ -51,24 +76,37 @@ public static class AudioPerformanceGuardian
     private static (bool IsUnderHeavyPressure, double GcPauseMs) GetRuntimePressure()
     {
         var info = GC.GetGCMemoryInfo();
+        var now = DateTime.UtcNow;
 
-        // 获取最后一次 GC 的总停顿时间
-        var totalPause = 0d;
+        // 1. 获取最后一次 GC 的总停顿时间
+        var currentPause = 0d;
         foreach (var pause in info.PauseDurations)
         {
-            totalPause += pause.TotalMilliseconds;
+            currentPause += pause.TotalMilliseconds;
         }
 
-        // 计算内存压力百分比
+        // 2. 更新 GC 追踪状态
+        if (info.Index > _lastGcIndex)
+        {
+            _lastGcIndex = info.Index;
+            _lastGcPauseMs = currentPause;
+            _lastGcTimestamp = now;
+        }
+
+        // 3. 判定该停顿是否依然“有效”（例如 20 秒内）
+        var isPauseRecent = (now - _lastGcTimestamp).TotalSeconds < 20;
+        var effectivePause = isPauseRecent ? _lastGcPauseMs : 0;
+
+        // 4. 计算内存压力百分比
         var loadPercentage = (float)info.MemoryLoadBytes / info.TotalAvailableMemoryBytes * 100;
 
-        // 3. 判定标准
-        // - 停顿 > 100ms (音频断流风险)
+        // 5. 判定标准
+        // - 最近发生的停顿 > 100ms (音频断流风险)
         // - 或者内存占用 > 95% (系统交换压力)
         // - 或者全进程 GC 时间占比过高 (info.PauseTimePercentage > 5)
-        var isHeavy = totalPause > 100 || loadPercentage > 95 || info.PauseTimePercentage > 5;
+        var isHeavy = effectivePause > 100 || loadPercentage > 95 || info.PauseTimePercentage > 5;
 
-        return (isHeavy, totalPause);
+        return (isHeavy, effectivePause);
     }
 
     private static long GetTotalMemoryGb() =>