From ef5d67624a657954983e0d5b0416b7509444c973 Mon Sep 17 00:00:00 2001
From: encode42 <me@encode42.dev>
Date: Tue, 9 Jun 2026 17:01:33 -0400
Subject: [PATCH] Update and enhance noise suppression config with gate

---
 hardware/audio/noise-cancellation.nix |  42 -----------
 hardware/audio/noise-suppression.nix  | 100 ++++++++++++++++++++++++++
 hosts/encryption/default.nix          |  12 ++++
 3 files changed, 112 insertions(+), 42 deletions(-)
 delete mode 100644 hardware/audio/noise-cancellation.nix
 create mode 100644 hardware/audio/noise-suppression.nix

diff --git a/hardware/audio/noise-cancellation.nix b/hardware/audio/noise-cancellation.nix
deleted file mode 100644
index 87f493a..0000000
--- a/hardware/audio/noise-cancellation.nix
+++ /dev/null
@@ -1,42 +0,0 @@
-{ pkgs, ... }:
-
-{
-  imports = [
-    ./pipewire.nix
-  ];
-
-  services.pipewire.extraConfig.pipewire."99-deepfilter-mono-source" = {
-    "context.modules" = [
-      {
-        name = "libpipewire-module-filter-chain";
-
-        args = {
-          "node.description" = "DeepFilter Noise Canceling Source";
-          "media.name" = "DeepFilter Noise Canceling Source";
-
-          "filter.graph" = {
-            nodes = [
-              {
-                type = "ladspa";
-                name = "DeepFilter Mono";
-                label = "deep_filter_mono";
-
-                plugin = "${pkgs.deepfilternet}/lib/ladspa/libdeep_filter_ladspa.so";
-
-                control = {
-                  "Attenuation Limit (dB)" = 100;
-                };
-              }
-            ];
-          };
-
-          "audio.rate" = 48000;
-          "audio.position" = "[MONO]";
-
-          "capture.props"."node.passive" = true;
-          "playback.props"."media.class" = "Audio/Source";
-        };
-      }
-    ];
-  };
-}
diff --git a/hardware/audio/noise-suppression.nix b/hardware/audio/noise-suppression.nix
new file mode 100644
index 0000000..efb2459
--- /dev/null
+++ b/hardware/audio/noise-suppression.nix
@@ -0,0 +1,100 @@
+# { device = { object; channel?; }; threshold; }
+{
+  device,
+  threshold,
+}:
+
+{
+  pkgs,
+  lib,
+  ...
+}:
+
+{
+  imports = [
+    ./pipewire.nix
+  ];
+
+  services.pipewire = {
+    extraLadspaPackages = with pkgs; [
+      deepfilternet
+      ladspaPlugins
+    ];
+
+    # TODO: Ability to pass multiple devices
+    # Currently, this only supports noise suppression on one device.
+    extraConfig.pipewire."99-noise-suppression-mono-source" = {
+      "context.modules" = [
+        {
+          name = "libpipewire-module-filter-chain";
+
+          flags = [ "nofail" ];
+
+          args = {
+            "node.description" = "Noise Suppression Source";
+            "media.name" = "Noise Suppression Source";
+
+            "filter.graph" = {
+              inputs = [ "DeepFilter:0" ];
+
+              nodes = [
+                {
+                  name = "DeepFilter";
+
+                  type = "ladspa";
+                  plugin = "libdeep_filter_ladspa";
+                  label = "deep_filter_mono";
+
+                  control = {
+                    "Attenuation Limit (dB)" = 72;
+                  };
+                }
+                {
+                  name = "Noise Gate";
+
+                  type = "ladspa";
+                  plugin = "gate_1410";
+                  label = "gate";
+
+                  control = {
+                    "Threshold (dB)" = threshold;
+
+                    "Attack (ms)" = 3.0;
+                    "Hold (ms)" = 500.0;
+                    "Decay (ms)" = 333.0;
+                  };
+                }
+              ];
+
+              links = [
+                {
+                  output = "DeepFilter:0";
+                  input = "Noise Gate:0";
+                }
+              ];
+
+              outputs = [ "Noise Gate:0" ];
+            };
+
+            "audio.rate" = 48000;
+            "audio.channels" = 1;
+            "audio.position" = "[MONO]";
+
+            "capture.props" = {
+              "node.name" = "capture.noise_suppression_source";
+              "node.passive" = true;
+
+              "target.object" = device.object;
+              "audio.position" = lib.optional (device ? channel) [ device.channel ];
+            };
+
+            "playback.props" = {
+              "node.name" = "noise_suppression_source";
+              "media.class" = "Audio/Source";
+            };
+          };
+        }
+      ];
+    };
+  };
+}
diff --git a/hosts/encryption/default.nix b/hosts/encryption/default.nix
index 383c081..de3468c 100644
--- a/hosts/encryption/default.nix
+++ b/hosts/encryption/default.nix
@@ -5,6 +5,16 @@
   ...
 }:
 
+let
+  noiseSuppressionModule = import (flakeRoot + /hardware/audio/noise-suppression.nix) {
+    device = {
+      object = "alsa_input.usb-Audient_EVO4-00.pro-input-0";
+      channel = "AUX0";
+    };
+
+    threshold = -40;
+  };
+in
 {
   imports = [
     nixos-hardware.nixosModules.msi-b350-tomahawk
@@ -22,6 +32,8 @@
     (flakeRoot + /config/desktop/environments/gnome.nix)
     (flakeRoot + /config/desktop/system/gamemode.nix)
 
+    noiseSuppressionModule
+
     ./users
   ];
 
-- 
2.51.2