add low latency pipewire options

common.nix

@@ -100,6 +100,7 @@
 
     # Use a firewall
     networking.firewall.enable = lib.mkDefault true;
+    networking.firewall.allowPing = true;
     networking.firewall.allowedTCPPorts = lib.mkDefault [ 22 ];
 
     programs.fish.enable = lib.mkDefault true;

modules/ezpw.nix

@@ -5,55 +5,199 @@ let
 in
 {
   options.services.ezpw = {
-    enable =
+    enable = mkEnableOption "Enable pipewire";
-      mkEnableOption
-        "Enable pipewire";
-  };
 
-  config = mkIf cfg.enable {
+    lowLatency = mkOption {
-    hardware.pulseaudio.enable = lib.mkDefault false;
+      type = types.bool;
-    sound.enable = lib.mkDefault false;
+      description = "Enable low latency configuration";
-
+      default = true;
-    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;
-
-      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.*"; }
-            ];
-          }
-        ];
-      };
     };
 
-    xdg.portal.enable = lib.mkDefault true;
+    usbSoundcard = mkOption {
-    xdg.portal.gtkUsePortal = lib.mkDefault true;
+      type = types.bool;
-    xdg.portal.extraPortals = lib.mkDefault (with pkgs; [ xdg-desktop-portal-wlr xdg-desktop-portal-gtk ]);
+      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-wlr xdg-desktop-portal-gtk ]);
+    };
 }

modules/workstation.nix

@@ -150,7 +150,7 @@ in
         domain = "@users";
         type = "-";
         item = "nice";
-        value = "-10";
+        value = "-15";
       }
     ];