nixos/settings/audio.nix

# audio.nix
{ config, pkgs, lib, ... }:
{
  # Enable sound with pipewire.
  services.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    jack.enable = true;
    
    # Enable audio monitoring for game capture
    extraConfig.pipewire."92-low-latency" = {
      context.properties = {
        default.clock.rate = 48000;
        default.clock.quantum = 1024;
        default.clock.min-quantum = 512;
        default.clock.max-quantum = 2048;
      };
    };
    
    # Allow capturing audio from all applications including Steam games
    extraConfig.pipewire."99-steam-monitor" = {
      context.modules = [
        {
          name = "libpipewire-module-loopback";
          args = {
            node.description = "Steam Audio Monitor";
            capture.props = {
              media.class = "Audio/Sink";
              audio.position = [ "FL" "FR" ];
            };
            playback.props = {
              media.class = "Audio/Source";
              audio.position = [ "FL" "FR" ];
            };
          };
        }
      ];
    };
  };
}