Add adaptive packet loss handling

2026-09-22 16:54:49 +02:00
parent 7c4708c3de
commit 7b0c003ad4
35 changed files with 518 additions and 60 deletions
@@ -0,0 +1,64 @@
+using VoiceCat.Server.Transport;
+using Voicecat.V1;
+
+namespace VoiceCat.Tests;
+
+public class PacketLossTrackerTests
+{
+    [Fact]
+    public void FastModeReportsWindowedLossAndCapsExtremeValues()
+    {
+        var clock = new ManualClock();
+        var tracker = new PacketLossTracker(clock);
+        Assert.Null(tracker.Observe(0, 1, PacketLossMode.PacketLossAutoFast));
+        for (ulong sequence = 1; sequence <= 100; sequence++)
+            if (sequence % 10 != 0) Assert.Null(tracker.Observe(sequence, 1, PacketLossMode.PacketLossAutoFast));
+        clock.Advance(TimeSpan.FromSeconds(3));
+
+        PacketLossSample sample = Assert.IsType<PacketLossSample>(tracker.Observe(101, 1, PacketLossMode.PacketLossAutoFast));
+        Assert.Equal(10U, sample.MeasuredPercent);
+        Assert.Equal(10U, sample.AppliedPercent);
+
+        tracker = new(clock);
+        Assert.Null(tracker.Observe(0, 1, PacketLossMode.PacketLossAutoFast));
+        clock.Advance(TimeSpan.FromSeconds(3));
+        sample = Assert.IsType<PacketLossSample>(tracker.Observe(100, 1, PacketLossMode.PacketLossAutoFast));
+        Assert.Equal(99U, sample.MeasuredPercent);
+        Assert.Equal(30U, sample.AppliedPercent);
+    }
+
+    [Fact]
+    public void ReorderingDoesNotCountAsLossAndStableModeWaitsForItsWindow()
+    {
+        var clock = new ManualClock();
+        var tracker = new PacketLossTracker(clock);
+        tracker.Observe(0, 1, PacketLossMode.PacketLossAutoStable);
+        tracker.Observe(2, 1, PacketLossMode.PacketLossAutoStable);
+        tracker.Observe(1, 1, PacketLossMode.PacketLossAutoStable);
+        for (ulong sequence = 3; sequence <= 30; sequence++) tracker.Observe(sequence, 1, PacketLossMode.PacketLossAutoStable);
+        clock.Advance(TimeSpan.FromSeconds(29));
+        Assert.Null(tracker.Observe(31, 1, PacketLossMode.PacketLossAutoStable));
+        clock.Advance(TimeSpan.FromSeconds(1));
+        PacketLossSample sample = Assert.IsType<PacketLossSample>(tracker.Observe(32, 1, PacketLossMode.PacketLossAutoStable));
+        Assert.Equal(0U, sample.MeasuredPercent);
+    }
+
+    [Fact]
+    public void ManualModeAndChannelChangesResetMeasurement()
+    {
+        var clock = new ManualClock();
+        var tracker = new PacketLossTracker(clock);
+        tracker.Observe(0, 1, PacketLossMode.PacketLossAutoFast);
+        clock.Advance(TimeSpan.FromSeconds(3));
+        Assert.Null(tracker.Observe(100, 2, PacketLossMode.PacketLossAutoFast));
+        Assert.Null(tracker.Observe(101, 2, PacketLossMode.PacketLossManual));
+    }
+
+    private sealed class ManualClock : TimeProvider
+    {
+        private long timestamp;
+        public override long TimestampFrequency => 1_000;
+        public override long GetTimestamp() => timestamp;
+        internal void Advance(TimeSpan duration) => timestamp += (long)duration.TotalMilliseconds;
+    }
+}