webrtc-audio-processing: Add derivation

pkgs/development/libraries/webrtc-audio-processing/default.nix

···
+{ stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  name = "webrtc-audio-processing-0.1";
+
+  src = fetchurl {
+    url = "http://freedesktop.org/software/pulseaudio/webrtc-audio-processing/${name}.tar.xz";
+    sha256 = "1p7yg8n39wwdfr52br2dq3bh8iypfx9md99mh1i9g2v8qbwm4jzd";
+  };
+
+  meta = with stdenv.lib; {
+    homepage = http://www.freedesktop.org/software/pulseaudio/webrtc-audio-processing;
+    description = "a more Linux packaging friendly copy of the AudioProcessing module from the WebRTC project";
+    license = licenses.bsd3;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ wkennington ];
+  };
+}

pkgs/top-level/all-packages.nix

···
 
   websocketpp = callPackage ../development/libraries/websocket++ { };
 
+  webrtc-audio-processing = callPackage ../development/libraries/webrtc-audio-processing { };
+
   wildmidi = callPackage ../development/libraries/wildmidi { };
 
   wiredtiger = callPackage ../development/libraries/wiredtiger { };