{ config, pkgs, ... }:

let
  json = pkgs.formats.json {};
  pw_rnnoise_config = {
  "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_stereo";
                        "control" = {
                            "VAD Threshold (%)" = 50.0;
                        };
                    }
                ];
            };
            "audio.position" = [ "FL" "FR" ];
            "capture.props" = {
                "node.name" = "effect_input.rnnoise";
                "node.passive" = true;
            };
            "playback.props" = {
                "node.name" = "effect_output.rnnoise";
                "media.class" = "Audio/Source";
            };
        };
      }
    ];
  };
in
{
  environment.systemPackages = with pkgs; [
    rnnoise
    rnnoise-plugin
  ];
  environment.etc."pipewire/pipewire.conf.d/99-input-denoising.conf" = {
    source = json.generate "99-input-denoising.conf" pw_rnnoise_config;
  };
}