Add noise supression to microphone.

nix/configuration/roles/sound/default.nix

@@ -21,5 +21,43 @@
     pulse.enable = true;
     # If you want to use JACK applications, uncomment this
     #jack.enable = true;
+
+    extraLv2Packages = [ pkgs.rnnoise-plugin ];
+    configPackages = [
+      (pkgs.writeTextDir "share/pipewire/pipewire.conf.d/20-rnnoise.conf" ''
+        context.modules = [
+        {   name = libpipewire-module-filter-chain
+            args = {
+                node.description = "Noise Canceling source"
+                media.name = "Noise Canceling source"
+                filter.graph = {
+                    nodes = [
+                        {
+                            type = lv2
+                            name = rnnoise
+                            plugin = "https://github.com/werman/noise-suppression-for-voice#stereo"
+                            label = noise_suppressor_stereo
+                            control = {
+                            }
+                        }
+                    ]
+                }
+                capture.props = {
+                    node.name =  "capture.rnnoise_source"
+                    node.passive = true
+                    audio.rate = 48000
+                    # Optionally specify a specific input: (ID from `pactl list`)
+                    # target.object = "alsa_input.usb-Shure_Incorporated_Shure_Digital-00.analog-stereo"
+                }
+                playback.props = {
+                    node.name =  "rnnoise_source"
+                    media.class = Audio/Source
+                    audio.rate = 48000
+                }
+            }
+        }
+        ]
+      '')
+    ];
   };
 }