From f1551d16b1ee7839398ef3d5cb1754e17fde3f36 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leonardo=20Eug=C3=AAnio?= <lelgenio@disroot.org>
Date: Sat, 13 Aug 2022 14:25:32 -0300
Subject: [PATCH] Add RNNoise

---
 user/home.nix    |  3 +++
 user/rnnoise.nix | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 user/rnnoise.nix

diff --git a/user/home.nix b/user/home.nix
index 8b118f4..1928f31 100644
--- a/user/home.nix
+++ b/user/home.nix
@@ -19,6 +19,7 @@ in {
     ./qutebrowser
     ./gpg.nix
     ./rofi.nix
+    ./rnnoise.nix
   ];
   # Home Manager needs a bit of information about you and the
   # paths it should manage.
@@ -64,6 +65,8 @@ in {
     imagemagick
     mpv
     mpc-cli
+    helvum
+    gimp
     # pulse_sink
     #games
     lutris
diff --git a/user/rnnoise.nix b/user/rnnoise.nix
new file mode 100644
index 0000000..746e189
--- /dev/null
+++ b/user/rnnoise.nix
@@ -0,0 +1,44 @@
+{ config, pkgs, lib, ... }:
+{
+  # RNNoise is a noise supperssion neural network
+  # Here we use it as a plugin for pipewire to create a virtual microphone
+  config = {
+    home.file = {
+      ".config/pipewire/pipewire.conf.d/99-input-denoising.conf".text = ''
+        context.modules = [
+        {   name = libpipewire-module-filter-chain
+            args = {
+                node.description =  "Noise Canceling source"
+                media.name =  "Noise Canceling source"
+                filter.graph = {
+                    nodes = [
+                        {
+                            type = ladspa
+                            name = rnnoise
+                            plugin = ${pkgs.rnnoise-plugin}/lib/ladspa/librnnoise_ladspa.so
+                            label = noise_suppressor_mono
+                            control = {
+                                "VAD Threshold (%)" 95.0
+                                "VAD Grace Period (ms)" 200
+                                "Retroactive VAD Grace (ms)" 100
+                            }
+                        }
+                    ]
+                }
+                capture.props = {
+                    node.name =  "capture.rnnoise_source"
+                    node.passive = true
+                    audio.rate = 48000
+                }
+                playback.props = {
+                    node.name =  "rnnoise_source"
+                    media.class = Audio/Source
+                    audio.rate = 48000
+                }
+            }
+        }
+        ]
+      '';
+    };
+  };
+}