pipewire: Inline low latency module

This removes the nix-gaming dependency to achieve low latency.

containers/wine.nix

@@ -1,4 +1,3 @@
-{ nix-gaming, ... }:
 let VARIABLES = import ../src/variables.nix; in {
   containers.wine = {
     privateNetwork = true;
@@ -36,9 +35,9 @@ let VARIABLES = import ../src/variables.nix; in {
 
     config = { pkgs, ... }: {
       imports = [
-        nix-gaming.nixosModules.pipewireLowLatency
         ../modules/pipewire.nix
       ];
+
       programs = {
         fish.enable = true;
         neovim.enable = true;

default.nix

@@ -1,10 +1,9 @@
-{ home-manager, stylix, nix-gaming, ... }:
+{ home-manager, stylix, ... }:
 
 let VARIABLES = import ./src/variables.nix; in {
   imports = [
     home-manager.nixosModules.home-manager
     stylix.nixosModules.stylix
-    nix-gaming.nixosModules.pipewireLowLatency
     "${VARIABLES.hostHardwareConfiguration}"
     ./containers
     ./home

modules/pipewire.nix

@@ -1,4 +1,11 @@
-{ pkgs, ... }: {
+{ pkgs, ... }:
+
+let
+  quantum = 64;
+  rate = 48000;
+  qr = "${toString quantum}/${toString rate}";
+  json = pkgs.formats.json {};
+in {
   services.pipewire = {
     enable = true;
 
@@ -8,8 +15,6 @@
     };
 
     pulse.enable = true;
-
-    lowLatency.enable = true;
   };
 
   environment.systemPackages = with pkgs; [
@@ -17,4 +22,52 @@
   ];
 
   security.rtkit.enable = true;
+
+  environment.etc = {
+    "pipewire/pipewire.d/99-lowlatency.conf".source = json.generate "99-lowlatency.conf" {
+      context.properties.default.clock.min-quantum = quantum;
+    };
+
+    "pipewire/pipewire-pulse.d/99-lowlatency.conf".source = json.generate "99-lowlatency.conf" {
+      context.modules = [
+        {
+          name = "libpipewire-module-rtkit";
+          args = {
+            nice.level = -15;
+            rt.prio = 88;
+            rt.time.soft = 200000;
+            rt.time.hard = 200000;
+          };
+          flags = ["ifexists" "nofail"];
+        }
+        {
+          name = "libpipewire-module-protocol-pulse";
+          args = {
+            pulse.min.req = qr;
+            pulse.min.quantum = qr;
+            pulse.min.frag = qr;
+            server.address = ["unix:native"];
+          };
+        }
+      ];
+
+      stream.properties = {
+        node.latency = qr;
+        resample.quality = 1;
+      };
+    };
+
+    "wireplumber/main.lua.d/99-alsa-lowlatency.lua".text = /* lua */ ''
+      alsa_monitor.rules = {
+        {
+          matches = {{{ "node.name", "matches", "alsa_output.*" }}};
+          apply_properties = {
+            ["audio.format"] = "S32LE",
+            ["audio.rate"] = ${toString (rate * 2)},
+            ["api.alsa.period-size"] = 2,
+          },
+        },
+      }
+    '';
+  };
 }