Low latency for sdac

nki-home/audio/default.nix

@@ -0,0 +1,5 @@
+{ config, pkgs, lib, ... }: {
+  environment.etc = {
+    "wireplumber/main.lua.d/51-sdac.lua".source = ./sdac.lua;
+  };
+}

nki-home/audio/sdac.lua

@@ -0,0 +1,16 @@
+rule = {
+  matches = {
+    {
+      { "node.name", "matches", "alsa_output.usb-Grace_Design_SDAC-00.*" },
+    },
+  },
+  apply_properties = {
+    ["audio.format"] = "S24_3LE",
+    ["audio.rate"] = 96000,
+    ["api.alsa.period-size"] = 2,
+    ["api.alsa.headroom"] = 0,
+    ["api.alsa.disable-batch"] = true
+  },
+}
+
+table.insert(alsa_monitor.rules, rule)