feat(obs-studio): add os snippet

nix/os/devices/steveej-x13s/configuration.nix

@@ -72,10 +72,12 @@
     nodeFlake.inputs.disko.nixosModules.disko
     ./disko.nix
 
+    ../../profiles/common/user.nix
+
     ../../snippets/nix-settings.nix
     ../../snippets/nix-settings-holo-chain.nix
     ../../snippets/mycelium.nix
-    ../../profiles/common/user.nix
+    ../../snippets/obs-studio.nix
 
     {
       services.openssh.enable = true;

nix/os/snippets/obs-studio.nix

@@ -0,0 +1,31 @@
+{config, ...}: let
+  # TODO: make configurable
+  homeUser = "steveej";
+in {
+  boot.extraModulePackages = [
+    config.boot.kernelPackages.v4l2loopback.out
+  ];
+
+  # Activate kernel modules (choose from built-ins and extra ones)
+  boot.kernelModules = [
+    # Virtual Camera
+    "v4l2loopback"
+    # Virtual Microphone, built-in
+    "snd-aloop"
+  ];
+
+  # exclusive_caps: Skype, Zoom, Teams etc. will only show device when actually streaming
+  # card_label: Name of virtual camera, how it'll show up in Skype, Zoom, Teams
+  # https://github.com/umlaeute/v4l2loopback
+  boot.extraModprobeConfig = ''
+    options v4l2loopback devices=1 video_nr=1 card_label="OBSCam" exclusive_caps=1
+  '';
+
+  security.polkit.enable = true;
+
+  home-manager.users.${homeUser} = _: {
+    imports = [
+      ../../home-manager/programs/obs-studio.nix
+    ];
+  };
+}