Improve iOS voice stability and user audio controls

tests/VoiceCat.Tests/AudioEngineTests.cs

@@ -102,6 +102,28 @@ public class AudioEngineTests
         Assert.True(fullReads > 5_000);
     }
 
+    [Theory]
+    [InlineData(-1000)]
+    [InlineData(1000)]
+    public void AdaptivePcmBufferKeepsBurstingIosCaptureBoundedOverLongCalls(int partsPerMillion)
+    {
+        var buffer = new AdaptivePcmBuffer(1, 120, 65_536);
+        short[] callback = new short[4_800], encoded = new short[960];
+        long produced = 0;
+        int lateStarvation = 0;
+        for (long consumerFrame = 0; consumerFrame < 48_000L * 600; consumerFrame += 960)
+        {
+            while (produced / (1 + partsPerMillion / 1_000_000.0) <= consumerFrame)
+            {
+                Assert.True(buffer.TryWrite(callback));
+                produced += callback.Length;
+            }
+            if (buffer.Read(encoded) == 0 && consumerFrame >= 48_000) lateStarvation++;
+            Assert.InRange(buffer.CountFrames, 0, 20_000);
+        }
+        Assert.Equal(0, lateStarvation);
+    }
+
     [Fact]
     public void OneCaptureMissDoesNotRestartTalkspurtButSustainedStarvationDoes()
     {
@@ -260,6 +282,21 @@ public class AudioEngineTests
         Assert.Equal(0, GC.GetAllocatedBytesForCurrentThread() - before);
     }
 
+    [Fact]
+    public void RemotePlaybackSettingsAreIndependentForEachUserStream()
+    {
+        StreamInfo microphone = Stream();
+        StreamInfo screen = Stream(); screen.StreamId = 2; screen.Ssrc = 43; screen.Kind = StreamKind.StreamScreenAudio; screen.Label = "Screen audio";
+        using var receive = new AudioEngine((_, _, _, _) => true, false);
+        receive.SetRemoteStreams([new() { Id = 7, ChannelId = 1, Streams = { microphone, screen } }], 1, 1);
+
+        receive.SetRemotePlayback(7, microphone.StreamId, 0.5f, true, true);
+        receive.SetRemotePlayback(7, screen.StreamId, 1.75f, false, false);
+
+        Assert.Equal((0.5f, true, true), receive.GetRemotePlayback(7, microphone.StreamId));
+        Assert.Equal((1.75f, false, false), receive.GetRemotePlayback(7, screen.StreamId));
+    }
+
     [Fact]
     public void JitterBacklogIsBoundedAndPlcEventuallyBecomesSilence()
     {

tests/VoiceCat.Tests/PublishServerScriptTests.cs

@@ -128,7 +128,7 @@ public class PublishServerScriptTests
         Assert.Contains("SetPreferredInputOrientation(AVAudioStereoOrientation.None", router);
         Assert.Contains("AVAudioSession.PolarPatternStereo", router);
         Assert.Contains("SupportsStereoPolarPattern", router);
-        Assert.Contains("route.TargetFrames = IosAudioRouter.Shared.UsesVoiceProcessing ? 3 : 6", engine);
+        Assert.Contains("AdaptivePcmBuffer Ring = new(channels, 120, 65_536)", engine);
         Assert.Contains("SelectedDataSourceId = null; SelectedPolarPattern = AVAudioDataSourcePolarPattern.Unknown", router);
         Assert.Contains("ClearStereoPolarPattern(session)", router);
         Assert.Contains("CaptureChannels == 2\n            ? port.DataSources?.FirstOrDefault", router);