nixos-config/modules/pipewire.nix

{ config, lib, modulesPath, pkgs, ... }:
let
  bluetoothSupport = config.sbruder.full;
in
lib.mkIf config.sbruder.gui.enable {
  sound.enable = true;
  services.pipewire = {
    enable = true;

    pulse.enable = true;
    alsa = {
      enable = true;
      support32Bit = true;
    };
  };

  # not exposed in NixOS module
  environment.etc."pipewire/media-session.d/bluez-hardware.conf".source = lib.mkForce ((pkgs.formats.json { }).generate "bluez-hardware.conf" (
    let
      defaults = (builtins.fromJSON (builtins.readFile "${modulesPath}/services/desktops/pipewire/bluez-hardware.conf.json"));
    in
    defaults // {
      "bluez5.features.device" = defaults."bluez5.features.device" ++ [
        # Sennheiser HD 4.50BTNC has unreliable hardware volume control (too
        # frequent changes cause it to not apply the changes) and sometimes
        # crashes (disconnects and shuts off) after too many changes.
        { name = "HD 4.50BTNC"; no-features = [ "hw-volume" ]; }
      ];
    }
  ));

  environment.systemPackages = with pkgs; [
    pavucontrol
    pulseaudio # pacmd and pactl
  ];

  hardware.bluetooth.enable = lib.mkDefault bluetoothSupport;
  services.blueman.enable = lib.mkDefault bluetoothSupport;
}