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diff --git a/Plugins/jingle/libjingle/talk/session/phone/mediaengine.h b/Plugins/jingle/libjingle/talk/session/phone/mediaengine.h
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+++ b/Plugins/jingle/libjingle/talk/session/phone/mediaengine.h
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+/*
+ * libjingle
+ * Copyright 2004--2005, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice, 
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products 
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// MediaEngine is an abstraction of a media engine which can be subclassed
+// to support different media componentry backends.
+
+#ifndef TALK_SESSION_PHONE_MEDIAENGINE_H_
+#define TALK_SESSION_PHONE_MEDIAENGINE_H_
+
+#include <string>  
+#include <vector>
+
+#include "talk/session/phone/codec.h"
+#include "talk/session/phone/mediachannel.h"
+
+namespace cricket {
+
+class MediaEngine {
+ public: 
+
+  MediaEngine() {}
+
+  // Bitmask flags for options that may be supported by the media engine implementation
+  enum MediaEngineOptions {
+     AUTO_GAIN_CONTROL = 1 << 1,
+  };
+
+  // Initialize 
+  virtual bool Init() = 0;
+  virtual void Terminate() = 0;
+  virtual MediaChannel *CreateChannel() = 0;
+
+  virtual int SetAudioOptions(int options) = 0;
+  virtual int SetSoundDevices(int wave_in_device, int wave_out_device) = 0;
+  virtual int GetInputLevel() = 0;
+
+  virtual std::vector<Codec> codecs() = 0;
+
+  virtual bool FindCodec(const Codec &codec) = 0;
+  
+  int GetCodecPreference (Codec codec);
+};  
+
+}  // namespace cricket
+
+#endif  // TALK_SESSION_PHONE_MEDIAENGINE_H_