Add drumgizmo, an LV2 sample based drum plugin

pkgs/development/libraries/audio/libsmf/default.nix

@@ -0,0 +1,20 @@
+{ lib, stdenv, fetchurl, glib, pkgconfig }:
+
+stdenv.mkDerivation rec {
+  version = "1.3";
+  name = "libsmf-${version}";
+  src = fetchurl {
+    url = "https://github.com/stump/libsmf/archive/${name}.tar.gz";
+    sha256 = "16c0n40h0r56gzbh5ypxa4dwp296dan3jminml2qkb4lvqarym6k";
+  };
+
+  buildInputs = [ glib pkgconfig ];
+
+  meta = with stdenv.lib; {
+    description = "A C library for reading and writing Standard MIDI Files";
+    homepage = https://github.com/stump/libsmf;
+    license = licenses.bsd2;
+    maintainers = [ maintainers.goibhniu ];
+    platforms = platforms.linux;
+  };
+}