From 47cbeeef9589d16cdc65fe9a035b49876a7668a7 Mon Sep 17 00:00:00 2001
From: Graham Barber <did:plc:57od6g2ic3e3b3kauctjmo3k>
Date: Wed, 21 Oct 2026 22:40:00 -0700
Subject: [PATCH] obelisk: fix Vesktop webcam capture with a stride-aware
 bridge

---
 hosts/obelisk/hardware.nix                  | 55 +++++++++++++++++++--
 modules/home/puregarlic/desktop/default.nix |  6 ++-
 2 files changed, 57 insertions(+), 4 deletions(-)

diff --git a/hosts/obelisk/hardware.nix b/hosts/obelisk/hardware.nix
index c829e13..ffb3e4a 100644
--- a/hosts/obelisk/hardware.nix
+++ b/hosts/obelisk/hardware.nix
@@ -1,4 +1,4 @@
-{ inputs, lib, pkgs, modulesPath, ... }:
+{ config, inputs, lib, pkgs, modulesPath, ... }:
 
 {
   imports =
@@ -18,8 +18,57 @@
 
   boot.initrd.availableKernelModules = [ "usb_storage" ];
   boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ ];
-  boot.extraModulePackages = [ ];
+  boot.kernelModules = [ "v4l2loopback" ];
+  boot.extraModulePackages = [
+    (pkgs.runCommand "v4l2loopback-modules" { } ''
+      for modules in ${config.boot.kernelPackages.v4l2loopback}/lib/modules/*; do
+        destination="$out/lib/modules/$(basename "$modules")"
+        mkdir -p "$destination"
+        cp -r "$modules/updates" "$destination/"
+      done
+    '')
+  ];
+  boot.extraModprobeConfig = ''
+    options v4l2loopback video_nr=10 card_label="FaceTime HD (compat)" exclusive_caps=1
+  '';
+
+  systemd.user.services.webcam-bridge = {
+    description = "Stride-aware FaceTime camera bridge";
+    serviceConfig.ExecStart = lib.getExe (pkgs.writeShellApplication {
+      name = "webcam-bridge";
+      runtimeInputs = [ pkgs.coreutils pkgs.gawk pkgs.v4l-utils pkgs.ffmpeg ];
+      text = ''
+        camera=""
+        for device in /sys/class/video4linux/video*; do
+          if [[ "$(< "$device/name")" == "apple-isp" ]]; then
+            camera="/dev/''${device##*/}"
+            break
+          fi
+        done
+        if [[ -z "$camera" ]]; then
+          printf 'FaceTime HD Camera not found\n' >&2
+          exit 1
+        fi
+
+        format=$(v4l2-ctl --device="$camera" \
+          --set-fmt-video=width=1280,height=720,pixelformat=NV12 \
+          --get-fmt-video)
+        dimensions=$(awk -F: '/Width\/Height/ { gsub(/[[:space:]]/, "", $2); sub(/\//, "x", $2); print $2 }' <<< "$format")
+        stride=$(awk -F: '/Bytes per Line/ { gsub(/[[:space:]]/, "", $2); print $2 }' <<< "$format")
+        if [[ ! "$dimensions" =~ ^[0-9]+x[0-9]+$ || ! "$stride" =~ ^[0-9]+$ ]]; then
+          printf 'Could not read camera dimensions and stride\n' >&2
+          exit 1
+        fi
+
+        v4l2-ctl --device="$camera" --silent --stream-mmap=4 --stream-to=- |
+          ffmpeg -hide_banner -loglevel warning \
+            -f rawvideo -pixel_format nv12 -video_size "$dimensions" \
+            -stride "$stride,$stride" -framerate 30 -i pipe:0 \
+            -an -vf format=yuyv422 -c:v rawvideo -pix_fmt yuyv422 \
+            -f v4l2 /dev/video10
+      '';
+    });
+  };
 
   fileSystems."/" =
     { device = "/dev/disk/by-uuid/481919ac-eec0-4739-8980-7dbbb9b45342";
diff --git a/modules/home/puregarlic/desktop/default.nix b/modules/home/puregarlic/desktop/default.nix
index 8f24cf6..62e8da1 100644
--- a/modules/home/puregarlic/desktop/default.nix
+++ b/modules/home/puregarlic/desktop/default.nix
@@ -53,7 +53,11 @@
   programs.zed-editor.enable = true;
   stylix.targets.zed.enable = true;
 
-  programs.vesktop.enable = true;
+  programs.vesktop = {
+    enable = true;
+    mutableSettings = true;
+    vencord.mutableSettings = true;
+  };
   programs.alacritty = {
     enable = true;
 
-- 
knotmirror 0.0.1