From d387d85dac99c79b070c27747f7b1025007339ff Mon Sep 17 00:00:00 2001
From: ServerBob <serverbob@local>
Date: Thu, 5 Mar 2026 08:43:56 +0000
Subject: [PATCH] fix(voice): stabilize deepfilter input and enforce legacy AGC
 constraints

---
 .../src/components/voice-provider/index.tsx    | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/apps/client/src/components/voice-provider/index.tsx b/apps/client/src/components/voice-provider/index.tsx
index 0bed86b..11c7846 100644
--- a/apps/client/src/components/voice-provider/index.tsx
+++ b/apps/client/src/components/voice-provider/index.tsx
@@ -139,6 +139,15 @@ const buildMicConstraints = (devices: TDeviceSettings): MediaTrackConstraints =>
     legacy.googEchoCancellation = true;
     legacy.googAutoGainControl = true;
     legacy.googTypingNoiseDetection = true;
+  } else {
+    // Chromium variants can still honor legacy goog* constraints.
+    // Mirror our intended DSP state explicitly to avoid implicit AGC.
+    const legacy = constraints as unknown as Record<string, unknown>;
+    legacy.googHighpassFilter = false;
+    legacy.googNoiseSuppression = !!constraints.noiseSuppression;
+    legacy.googEchoCancellation = !!constraints.echoCancellation;
+    legacy.googAutoGainControl = !!constraints.autoGainControl;
+    legacy.googTypingNoiseDetection = false;
   }
 
   return constraints;
@@ -410,6 +419,7 @@ const VoiceProvider = memo(({ children }: TVoiceProviderProps) => {
     const dest = ctx.createMediaStreamDestination();
 
     let current: AudioNode = source;
+    let preGainNode: GainNode | undefined;
     let deepFilterNode: AudioWorkletNode | undefined;
     let deepFilterCore: DeepFilterNet3Core | undefined;
     let rnnoiseNode: AudioWorkletNode | undefined;
@@ -420,6 +430,7 @@ const VoiceProvider = memo(({ children }: TVoiceProviderProps) => {
         gateNode?.disconnect();
         rnnoiseNode?.disconnect();
         deepFilterNode?.disconnect();
+        preGainNode?.disconnect();
         source.disconnect();
         dest.disconnect();
         deepFilterCore?.destroy?.();
@@ -438,6 +449,13 @@ const VoiceProvider = memo(({ children }: TVoiceProviderProps) => {
 
     try {
       if (useDeepFilterNet) {
+        // Mild pre-gain helps keep quiet speech above the model floor
+        // without aggressively boosting background noise.
+        preGainNode = ctx.createGain();
+        preGainNode.gain.value = 1.35;
+        current.connect(preGainNode);
+        current = preGainNode;
+
         const deepFilterSuppression = sensitivityToDeepFilterLevel(
           devices.voiceSensitivity ?? 70
         );