Add managed codec DSP and initial control server

2026-09-15 22:51:33 +02:00
parent 2df79cdd4c
commit 4067bab7c2
52 changed files with 2503 additions and 20 deletions
@@ -0,0 +1,48 @@
+namespace VoiceCat.Dsp;
+
+public sealed class EnergyVadProcessor
+{
+    private readonly TimeProvider timeProvider;
+    private long lastVoiceTimestamp;
+    private bool hasVoice;
+    private float threshold;
+
+    public float Threshold
+    {
+        get => Volatile.Read(ref threshold);
+        set
+        {
+            if (!float.IsFinite(value) || value is < 0 or > 1) throw new ArgumentOutOfRangeException(nameof(value));
+            Volatile.Write(ref threshold, value);
+        }
+    }
+    public TimeSpan HangTime { get; }
+
+    public EnergyVadProcessor(float threshold = 0.02f, TimeSpan? hangTime = null, TimeProvider? timeProvider = null)
+    {
+        Threshold = threshold;
+        HangTime = hangTime ?? TimeSpan.FromMilliseconds(300);
+        if (HangTime < TimeSpan.Zero) throw new ArgumentOutOfRangeException(nameof(hangTime));
+        this.timeProvider = timeProvider ?? TimeProvider.System;
+    }
+
+    public bool Process(ReadOnlySpan<short> pcm)
+    {
+        long now = timeProvider.GetTimestamp();
+        if (!pcm.IsEmpty)
+        {
+            double sum = 0;
+            foreach (short sample in pcm)
+            {
+                double normalized = sample / 32768.0;
+                sum += normalized * normalized;
+            }
+            if (Math.Sqrt(sum / pcm.Length) >= Threshold)
+            {
+                lastVoiceTimestamp = now;
+                hasVoice = true;
+            }
+        }
+        return hasVoice && timeProvider.GetElapsedTime(lastVoiceTimestamp, now) < HangTime;
+    }
+}