content/browser/media/media_web_contents_observer.h

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_
#define CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_

#include "base/compiler_specific.h"
#include "base/containers/scoped_ptr_hash_map.h"
#include "content/common/content_export.h"
#include "content/public/browser/web_contents_observer.h"

namespace content {

class BrowserCdmManager;
#if defined(OS_ANDROID)
class BrowserMediaPlayerManager;
#endif  // defined(OS_ANDROID)
class RenderViewHost;

// This class manages all RenderFrame based media related managers at the
// browser side. It receives IPC messages from media RenderFrameObservers and
// forwards them to the corresponding managers. The managers are responsible
// for sending IPCs back to the RenderFrameObservers at the render side.
class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
 public:
  explicit MediaWebContentsObserver(RenderViewHost* render_view_host);
  virtual ~MediaWebContentsObserver();

  // WebContentsObserver implementations.
  virtual void RenderFrameDeleted(RenderFrameHost* render_frame_host) OVERRIDE;
  virtual bool OnMessageReceived(const IPC::Message& message,
                                 RenderFrameHost* render_frame_host) OVERRIDE;

  // Helper function to handle CDM IPC messages. Returns whether the |message|
  // is handled in the function.
  bool OnCdmMessageReceived(const IPC::Message& message,
                            RenderFrameHost* render_frame_host);

  // Gets the CDM manager associated with |render_frame_host|. Creates
  // a new one if it doesn't exist. The caller doesn't own the returned pointer.
  BrowserCdmManager* GetCdmManager(RenderFrameHost* render_frame_host);

#if defined(OS_ANDROID)
  // Helper functions to handle media player IPC messages. Returns whether the
  // |message| is handled in the function.
  bool OnMediaPlayerMessageReceived(const IPC::Message& message,
                                    RenderFrameHost* render_frame_host);
  bool OnMediaPlayerSetCdmMessageReceived(const IPC::Message& message,
                                          RenderFrameHost* render_frame_host);

  // Gets the media player manager associated with |render_frame_host|. Creates
  // a new one if it doesn't exist. The caller doesn't own the returned pointer.
  BrowserMediaPlayerManager* GetMediaPlayerManager(
      RenderFrameHost* render_frame_host);

  void OnSetCdm(RenderFrameHost* render_frame_host, int player_id, int cdm_id);

  // Pauses all media player.
  void PauseVideo();

#if defined(VIDEO_HOLE)
  void OnFrameInfoUpdated();
#endif  // defined(VIDEO_HOLE)

#endif  // defined(OS_ANDROID)

 private:
  // Map from RenderFrameHost* to BrowserCdmManager.
  typedef base::ScopedPtrHashMap<uintptr_t, BrowserCdmManager> CdmManagerMap;
  CdmManagerMap cdm_managers_;

#if defined(OS_ANDROID)
  // Map from RenderFrameHost* to BrowserMediaPlayerManager.
  typedef base::ScopedPtrHashMap<uintptr_t, BrowserMediaPlayerManager>
      MediaPlayerManagerMap;
  MediaPlayerManagerMap media_player_managers_;
#endif  // defined(OS_ANDROID)

  DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserver);
};

}  // namespace content

#endif  // CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_