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+/****************************************************************************
+**
+** Copyright (c) 2012 The Chromium Authors. All rights reserved.
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MEDIA_CAPTURE_DEVICES_DISPATCHER_H
+#define MEDIA_CAPTURE_DEVICES_DISPATCHER_H
+
+#include <deque>
+#include <list>
+#include <map>
+#include <QtCore/qcompilerdetection.h>
+
+#include "web_contents_adapter_client.h"
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/singleton.h"
+#include "base/observer_list.h"
+#include "content/public/browser/media_observer.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/web_contents_delegate.h"
+#include "content/public/common/media_stream_request.h"
+
+class AudioStreamIndicator;
+class DesktopStreamsRegistry;
+class MediaStreamCaptureIndicator;
+
+// This singleton is used to receive updates about media events from the content
+// layer. Based on Chrome's implementation.
+class MediaCaptureDevicesDispatcher : public content::MediaObserver,
+                                      public content::NotificationObserver {
+ public:
+
+  static MediaCaptureDevicesDispatcher *GetInstance();
+
+  void processMediaAccessRequest(WebContentsAdapterClient *, content::WebContents *, const content::MediaStreamRequest &, const content::MediaResponseCallback &);
+
+  // Called back from our WebContentsAdapter to grant the requested permission.
+  void handleMediaAccessPermissionResponse(content::WebContents *, const QUrl &securityOrigin, WebContentsAdapterClient::MediaRequestFlags);
+
+  void getDefaultDevices(const std::string &audioDeviceId, const std::string &videoDeviceId, bool audio, bool video, content::MediaStreamDevices *);
+
+  // Overridden from content::MediaObserver:
+  virtual void OnAudioCaptureDevicesChanged(const content::MediaStreamDevices &) Q_DECL_OVERRIDE;
+  virtual void OnVideoCaptureDevicesChanged(const content::MediaStreamDevices &) Q_DECL_OVERRIDE;
+  virtual void OnMediaRequestStateChanged(int renderProcessId, int renderViewId, int pageRequestId, const content::MediaStreamDevice &device
+                                          , content::MediaRequestState state) Q_DECL_OVERRIDE;
+  virtual void OnAudioStreamPlayingChanged(int /*render_process_id*/, int /*render_view_id*/, int /*stream_id*/
+                                           , bool /*is_playing*/, float /*power_dBFS*/, bool /*clipped*/) Q_DECL_OVERRIDE {}
+  virtual void OnCreatingAudioStream(int renderProcessId, int renderViewId) Q_DECL_OVERRIDE;
+
+  DesktopStreamsRegistry *getDesktopStreamsRegistry();
+
+ private:
+  friend struct DefaultSingletonTraits<MediaCaptureDevicesDispatcher>;
+
+  struct PendingAccessRequest {
+    PendingAccessRequest(const content::MediaStreamRequest &request,
+                         const content::MediaResponseCallback &callback);
+    ~PendingAccessRequest();
+
+    content::MediaStreamRequest request;
+    content::MediaResponseCallback callback;
+  };
+  typedef std::deque<PendingAccessRequest> RequestsQueue;
+  typedef std::map<content::WebContents *, RequestsQueue> RequestsQueues;
+
+  MediaCaptureDevicesDispatcher();
+  virtual ~MediaCaptureDevicesDispatcher();
+
+  const content::MediaStreamDevices &getAudioCaptureDevices();
+  const content::MediaStreamDevices &getVideoCaptureDevices();
+
+  // content::NotificationObserver implementation.
+  virtual void Observe(int type, const content::NotificationSource &source, const content::NotificationDetails &details) Q_DECL_OVERRIDE;
+
+  // Helpers for ProcessMediaAccessRequest().
+  void processDesktopCaptureAccessRequest(content::WebContents *, const content::MediaStreamRequest &, const content::MediaResponseCallback &);
+  void processScreenCaptureAccessRequest(content::WebContents *,const content::MediaStreamRequest &, const content::MediaResponseCallback &);
+  void handleScreenCaptureAccessRequest(content::WebContents *, bool userAccepted, const base::string16 &/*unused callback_input*/);
+  void enqueueMediaAccessRequest(content::WebContents *, const content::MediaStreamRequest &, const content::MediaResponseCallback &);
+  void ProcessQueuedAccessRequest(content::WebContents *);
+
+  // Called by the MediaObserver() functions, executed on UI thread.
+  void updateAudioDevicesOnUIThread(const content::MediaStreamDevices &);
+  void updateVideoDevicesOnUIThread(const content::MediaStreamDevices &);
+  void updateMediaRequestStateOnUIThread(int renderProcessId, int renderViewId, int pageRequestId, const content::MediaStreamDevice &
+                                         , content::MediaRequestState);
+
+  // A list of cached audio capture devices.
+  content::MediaStreamDevices m_audioDevices;
+
+  // A list of cached video capture devices.
+  content::MediaStreamDevices m_videoDevices;
+
+  // Flag to indicate if device enumeration has been done/doing.
+  // Only accessed on UI thread.
+  bool m_devicesEnumerated;
+
+  RequestsQueues m_pendingRequests;
+
+  scoped_ptr<DesktopStreamsRegistry> m_desktopStreamsRegistry;
+
+  content::NotificationRegistrar m_notificationsRegistrar;
+
+  // Tracks MEDIA_DESKTOP_VIDEO_CAPTURE sessions which reach the
+  // MEDIA_REQUEST_STATE_DONE state.  Sessions are remove when
+  // MEDIA_REQUEST_STATE_CLOSING is encountered.
+  struct DesktopCaptureSession {
+    int render_process_id;
+    int render_view_id;
+    int page_request_id;
+  };
+  typedef std::list<DesktopCaptureSession> DesktopCaptureSessions;
+  DesktopCaptureSessions m_desktopCaptureSessions;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaCaptureDevicesDispatcher);
+};
+
+#endif  // MEDIA_CAPTURE_DEVICES_DISPATCHER_H