full rewrite, first commit

modules/nixos/hardware/audio/default.nix

@@ -0,0 +1,88 @@
+{
+  options,
+  config,
+  pkgs,
+  lib,
+  namespace,
+  ...
+}:
+with lib;
+with lib.${namespace};
+let
+  cfg = config.${namespace}.hardware.audio;
+in
+{
+  options.${namespace}.hardware.audio = with types; {
+    enable = mkBoolOpt false "Whether or not to enable audio support.";
+    extra-packages = mkOpt (listOf package) [ ] "Additional packages to install.";
+  };
+
+  config = mkIf cfg.enable {
+    services.pipewire = {
+      enable = true;
+      alsa.enable = true;
+      pulse.enable = true;
+      jack.enable = true;
+
+      wireplumber.enable = true;
+
+    };
+
+    hardware.pulseaudio.enable = mkForce false;
+
+    environment.systemPackages =
+      with pkgs;
+      [
+        pulsemixer
+        pavucontrol
+      ]
+      ++ cfg.extra-packages;
+
+    services.pipewire.extraConfig.pipewire = {
+      "90-nullsink" = {
+        "context.object" = [
+          {
+            factory = "adapter";
+            args = {
+              "factory.name" = "support.null-audio-sink";
+              "node.name" = "Null Sink";
+              "media.class" = "Audio/Sink";
+              "audio.position" = "[ FL FR ]";
+              "monitor.channel-volumes" = "true";
+              "monitor.passthrough" = "true";
+              "adapter.auto-port-config" = {
+                "mode" = "dsp";
+                "monitor" = "true";
+                "position" = "preserve";
+              };
+            };
+          }
+        ];
+      };
+      "90-loopback" = {
+        "context.modules" = [
+          {
+            name = "libpipewire-module-loopback";
+            args = {
+              "node.description" = "Scarlett 2i2 Loopback";
+              "capture.props" = {
+                "node.name" = "Scarlett_2i2_Loopback";
+                "media.class" = "Audio/Sink";
+                "audio.position" = "[ FL FR ]";
+              };
+              "playback.props" = {
+                "node.name" = "playback.Scarlett_2i2_Loopback";
+                "audio.position" = "[ AUX0 AUX1 ]";
+                "target.object" = "alsa_output.usb-Focusrite_Scarlett_2i2_USB-00.pro-output-0";
+                "stream.dont-reconnect" = "true";
+                "node.dont-reconnect" = "false";
+                "node.passive" = "true";
+              };
+            };
+          }
+        ];
+      };
+    };
+  };
+
+}