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zephrynis
91053f9693
App-independent mic denoising as a PipeWire filter-chain exposing a "Noise Canceling source" — replaces Discord's unusable Krisp and works in every app. Imported into the nixos-pc host. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
75 lines
2.8 KiB
Nix
75 lines
2.8 KiB
Nix
{ pkgs, ... }:
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# App-independent microphone noise suppression via PipeWire + RNNoise.
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#
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# Replaces Discord's Krisp (which can't be enabled on current nixpkgs Discord:
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# the binary is patchelf'd, and even after bypassing Krisp's signature check the
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# newer "THz SDK" stage fails with KRISP_INIT_ERROR_GLOBAL_INIT). Instead we run
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# RNNoise as a PipeWire filter-chain that exposes a cleaned virtual microphone.
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#
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# This works in EVERY app (Discord, browser, OBS, games), survives Discord
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# updates, and touches no DRM. In each app's input settings, pick the source
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# named "Noise Canceling source" instead of the raw mic.
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{
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# LADSPA plugin providing noise_suppressor_mono/stereo (werman RNNoise).
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environment.systemPackages = [ pkgs.rnnoise-plugin ];
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services.pipewire.extraConfig.pipewire."99-input-denoising" = {
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"context.modules" = [
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{
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name = "libpipewire-module-filter-chain";
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args = {
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"node.description" = "Noise Canceling source";
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"media.name" = "Noise Canceling source";
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"filter.graph" = {
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nodes = [
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{
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type = "ladspa";
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name = "rnnoise";
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plugin = "${pkgs.rnnoise-plugin}/lib/ladspa/librnnoise_ladspa.so";
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label = "noise_suppressor_mono";
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control = {
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# Higher threshold = more aggressive gating of non-voice.
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# 50% is a balanced starting point; raise toward 90–95 if a
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# noisy background still leaks through, lower if speech clips.
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"VAD Threshold (%)" = 50.0;
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"VAD Grace Period (ms)" = 200.0;
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"Retroactive VAD Grace (ms)" = 0.0;
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};
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}
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{
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# Makeup gain baked into the graph so the source volume is
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# reproducible instead of living only in WirePlumber's runtime
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# state. Mult = 1.53 matches the 153% level set in the mixer.
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type = "builtin";
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name = "gain";
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label = "linear";
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control = {
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"Mult" = 1.53;
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"Add" = 0.0;
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};
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}
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];
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links = [
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{ output = "rnnoise:Output"; input = "gain:In"; }
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];
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};
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# The virtual mic apps select. media.class = Audio/Source makes it
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# appear as a capture device throughout the desktop.
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"capture.props" = {
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"node.name" = "capture.rnnoise_source";
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"node.passive" = true;
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"audio.rate" = 48000;
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};
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"playback.props" = {
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"node.name" = "rnnoise_source";
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"media.class" = "Audio/Source";
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"audio.rate" = 48000;
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};
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};
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}
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];
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};
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}
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