nixfiles/modules/ezpw.nix

{ config, lib, pkgs, ... }:
with lib;
let
  cfg = config.services.ezpw;
in
{
  options.services.ezpw = {
    enable = mkEnableOption "Enable pipewire";

    lowLatency = mkOption {
      type = types.bool;
      description = "Enable low latency configuration";
      default = true;
    };

    usbSoundcard = mkOption {
      type = types.bool;
      description = "Doubles the audio rate for alsa outputs in low latency mode";
      default = false;
    };

    periodSize = mkOption {
      type = types.int;
      description = "Pipewire period size in low latency mode (\"tweak by trial-and-error\")";
      default = 32;
    };

    rate = mkOption {
      type = types.int;
      description = "Pipewire rate in low latency mode";
      default = 48000;
    };

    quantum = mkOption {
      type = types.int;
      description = "Pipewire quantum in low latency mode";
      default = 64;
    };
  };

  config =
    let
      qr = "${toString cfg.quantum}/${toString cfg.rate}";
    in
    mkIf cfg.enable {
      hardware.pulseaudio.enable = lib.mkDefault false;
      sound.enable = lib.mkDefault false;

      services.pipewire = {
        enable = lib.mkDefault true;
        jack.enable = lib.mkDefault true;
        alsa.enable = lib.mkDefault true;
        alsa.support32Bit = lib.mkDefault true;
        pulse.enable = lib.mkDefault true;

        media-session.enable = lib.mkDefault false;
        wireplumber.enable = lib.mkDefault true;

        config = mkIf cfg.lowLatency {
          pipewire = {
            "context.properties" = {
              "default.clock.rate" = cfg.rate;
              "default.clock.quantum" = cfg.quantum;
              "default.clock.min-quantum" = cfg.quantum;
            };

            "context.modules" = [
              {
                name = "libpipewire-module-rtkit";
                args = {
                  "nice.level" = -11;
                  "rt.prio" = 88;
                  "rt.time.soft" = 200000;
                  "rt.time.hard" = 200000;
                };
                flags = [ "ifexists" "nofail" ];
              }
              { name = "libpipewire-module-protocol-native"; }
              { name = "libpipewire-module-profiler"; }
              { name = "libpipewire-module-metadata"; }
              { name = "libpipewire-module-spa-device-factory"; }
              { name = "libpipewire-module-spa-node-factory"; }
              { name = "libpipewire-module-client-node"; }
              { name = "libpipewire-module-client-device"; }
              {
                name = "libpipewire-module-portal";
                flags = [ "ifexists" "nofail" ];
              }
              {
                name = "libpipewire-module-access";
                args = { };
              }
              { name = "libpipewire-module-adapter"; }
              { name = "libpipewire-module-link-factory"; }
              { name = "libpipewire-module-session-manager"; }
            ];
          };

          pipewire-pulse = {
            "context.modules" = [
              {
                name = "libpipewire-module-rtkit";
                args = {
                  "nice.level" = -11;
                  "rt.prio" = 88;
                  "rt.time.soft" = 200000;
                  "rt.time.hard" = 200000;
                };
                flags = [ "ifexists" "nofail" ];
              }
              { name = "libpipewire-module-protocol-native"; }
              { name = "libpipewire-module-client-node"; }
              { name = "libpipewire-module-adapter"; }
              { name = "libpipewire-module-metadata"; }
              {
                name = "libpipewire-module-protocol-pulse";
                args = {
                  "pulse.min.req" = qr;
                  "pulse.default.req" = qr;
                  "pulse.min.quantum" = qr;
                  "server.address" = [ "unix:native" ];
                };
              }
            ];

            "stream.properties" = {
              "node.latency" = qr;
              "resample.quality" = 1;
            };
          };
        };

        media-session.config.alsa-monitor = mkIf cfg.lowLatency {
          rules = [
            {
              matches = [{ node.name = "alsa_output.*"; }];
              actions = {
                update-props = {
                  "audio.format" = "S32LE";
                  "audio.rate" = cfg.rate * (if cfg.usbSoundcard then 2 else 1);
                  "api.alsa.period-size" = cfg.periodSize;
                };
              };
            }
          ];
        };

        media-session.config.bluez-monitor = {
          properties = {
            "bluez5.codecs" = [ "sbc" "aac" "ldac" "aptx" "aptx_hd" ];
            "bluez5.mdbc-support" = true;
          };
          rules = [
            {
              actions = {
                update-props = {
                  "bluez5.auto-connect" = [ "hsp_hs" "hfp_hf" "a2dp_sink" ];
                  "bluez5.hw-volume" =
                    [ "hsp_ag" "hfp_ag" "a2dp_source" "a2dp_sink" ];
                  "bluez5.autoswitch-profile" = true;
                };
              };
              matches = [{ "device.name" = "~bluez_card.*"; }];
            }
            {
              actions = { update-props = { "node.pause-on-idle" = false; }; };
              matches = [
                { "node.name" = "~bluez_input.*"; }
                { "node.name" = "~bluez_output.*"; }
              ];
            }
          ];
        };
      };

      environment.systemPackages = with pkgs; [
        # pactl is required for pipewire-pulse
        pulseaudio
      ];

      environment.etc."wireplumber/main.lua.d/51-alsa-config.lua".text = mkIf cfg.lowLatency ''
        alsa_monitor.properties = {
          ["audio.rate"] = ${toString (cfg.rate * (if cfg.usbSoundcard then 2 else 1))},
          ["audio.format"] = "S32LE",
          ["api.alsa.headroom"] = 512,
          ["api.alsa.period-size"] = ${toString cfg.periodSize}
        }
      '';

      environment.etc."wireplumber/bluetooth.lua.d/51-bluez-config.lua".text = ''
        bluez_monitor.properties = {
          ["bluez5.enable-sbc-xq"] = true,
          ["bluez5.enable-msbc"] = true,
          ["bluez5.enable-hw-volume"] = true,
          ["bluez5.headset-roles"] = "[ hsp_hs hsp_ag hfp_hf hfp_ag ]"
        }
      '';

      xdg.portal.enable = lib.mkDefault true;
      xdg.portal.gtkUsePortal = lib.mkDefault true;
      xdg.portal.extraPortals = lib.mkDefault (with pkgs; [ xdg-desktop-portal-gnome xdg-desktop-portal-wlr xdg-desktop-portal-gtk ]);
    };
}