talk/session/phone/mediaengine.h

/*
 * 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, 
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 */

// 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_