add gnonlin 1.2.0

pkgs/development/libraries/gstreamer/default.nix

@@ -14,4 +14,6 @@ rec {
   gst-libav = callPackage ./libav { inherit gst-plugins-base; };
 
   gst-python = callPackage ./python { inherit gst-plugins-base gstreamer; };
+
+  gnonlin = callPackage ./gnonlin { inherit gst-plugins-base; };
 }

pkgs/development/libraries/gstreamer/gnonlin/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, fetchurl, pkgconfig
+, gst-plugins-base
+}:
+
+stdenv.mkDerivation rec {
+  name = "gnonlin-1.2.0";
+
+  meta = with stdenv.lib; {
+    description = "Gstreamer Non-Linear Multimedia Editing Plugins";
+    homepage    = "http://gstreamer.freedesktop.org";
+    longDescription = ''
+      Gnonlin is a library built on top of GStreamer which provides 
+      support for writing non-linear audio and video editing
+      applications. It introduces the concept of a timeline.
+    '';
+    license     = licenses.lgpl2Plus; 
+    platforms   = platforms.linux;
+    maintainers = with maintainers; [ iyzsong ];
+  };
+
+  src = fetchurl {
+    url = "${meta.homepage}/src/gnonlin/${name}.tar.xz";
+    sha256 = "15hyb0kg8sm92kj37cir4l3sa21b8zy4la1ccfhb358b4mf24vl7";
+  };
+
+  nativeBuildInputs = [ pkgconfig ];
+
+  propagatedBuildInputs = [ gst-plugins-base ];
+}