add obs-studio

Open Broadcaster Software is free and open source software for video recording
and live streaming

https://obsproject.com/

pkgs/applications/video/obs-studio/default.nix

@@ -0,0 +1,46 @@
+{ stdenv
+, fetchurl
+, cmake
+, ffmpeg
+, jansson
+, libxkbcommon
+, qt5
+, libv4l
+, x264
+}:
+
+stdenv.mkDerivation rec {
+  name = "obs-studio";
+  version = "0.9.1";
+
+  src = fetchurl {
+    url = "https://github.com/jp9000/${name}/archive/${version}.tar.gz";
+    sha256 = "198ymfdrg58i3by58fs68df835rkpnpagnvyzlilmn9ypvpa8h81";
+  };
+
+  buildInputs = [ cmake
+                  ffmpeg
+                  jansson
+                  libv4l
+                  libxkbcommon
+                  qt5
+                  x264
+                ];
+
+  # obs attempts to dlopen libobs-opengl, it fails unless we make sure
+  # DL_OPENGL is an explicit path. Not sure if there's a better way
+  # to handle this.
+  cmakeFlags = [ "-DCMAKE_CXX_FLAGS=-DDL_OPENGL=\\\"$(out)/lib/libobs-opengl.so\\\"" ];
+
+  meta = with stdenv.lib; {
+    description = "Free and open source software for video recording and live streaming";
+    longDescription = ''
+      This project is a rewrite of what was formerly known as "Open Broadcaster
+      Software", software originally designed for recording and streaming live
+      video content, efficiently
+    '';
+    homepage = "https://obsproject.com";
+    maintainers = with maintainers; [ jb55 ];
+    license = licenses.gpl2;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -11345,6 +11345,8 @@ let
     inherit (gnome) libglade;
   };
 
+  obs-studio = callPackage ../applications/video/obs-studio { };
+
   ocrad = callPackage ../applications/graphics/ocrad { };
 
   offrss = callPackage ../applications/networking/offrss { };