gecko/dom/audiochannel/AudioChannelServiceChild.h

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_audiochannelservicechild_h__
#define mozilla_dom_audiochannelservicechild_h__

#include "nsAutoPtr.h"
#include "nsISupports.h"

#include "AudioChannelService.h"
#include "AudioChannelCommon.h"

namespace mozilla {
namespace dom {

class AudioChannelServiceChild : public AudioChannelService
{
public:

  /**
   * Returns the AudioChannelServce singleton or null if the process havn't create it before.
   * Only to be called from main thread.
   */
  static AudioChannelService* GetAudioChannelService();

  /**
   * Returns the AudioChannelServce singleton.
   * If AudioChannelServce is not exist, create and return new one.
   * Only to be called from main thread.
   */
  static AudioChannelService* GetOrCreateAudioChannelService();

  static void Shutdown();

  virtual void RegisterAudioChannelAgent(AudioChannelAgent* aAgent,
                                         AudioChannel aChannel,
                                         bool aWithVideo);
  virtual void UnregisterAudioChannelAgent(AudioChannelAgent* aAgent);

  /**
   * Return the state to indicate this agent should keep playing/
   * fading volume/muted.
   */
  virtual AudioChannelState GetState(AudioChannelAgent* aAgent,
                                     bool aElementHidden);

  virtual void SetDefaultVolumeControlChannel(int32_t aChannel,
                                              bool aHidden);

protected:
  AudioChannelServiceChild();
  virtual ~AudioChannelServiceChild();
};

} // namespace dom
} // namespace mozilla

#endif