content/browser/android/media_players_observer.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_ANDROID_MEDIA_PLAYERS_OBSERVER_H_
   6 #define CONTENT_BROWSER_ANDROID_MEDIA_PLAYERS_OBSERVER_H_
   7
   8 #include <map>
   9
  10 #include "base/macros.h"
  11 #include "content/browser/media/audio_state_provider.h"
  12
  13 namespace content {
  14
  15 class RenderFrameHost;
  16
  17 // On Android the MediaPlayerAndroid objects report
  18 // the audible state to us.
  19 class MediaPlayersObserver : public AudioStateProvider {
  20  public:
  21   explicit MediaPlayersObserver(WebContents* web_contents);
  22   ~MediaPlayersObserver() override;
  23
  24   bool IsAudioStateAvailable() const override;
  25
  26   // This audio state provider does not have a monitor,
  27   // the method returns nullptr.
  28   AudioStreamMonitor* audio_stream_monitor() override;
  29
  30   // These methods constitute the observer pattern, should
  31   // be called when corresponding event happens. They will notify
  32   // WebContents whenever its audible state as a whole changes.
  33   void OnAudibleStateChanged(RenderFrameHost* rfh, int player_id,
  34                              bool is_audible);
  35   void RemovePlayer(RenderFrameHost* rfh, int player_id);
  36   void RenderFrameDeleted(RenderFrameHost* rfh);
  37
  38  private:
  39   void UpdateStatusAndNotify();
  40
  41   // Audible status per player ID and frame
  42   typedef std::pair<RenderFrameHost*, int> Key;
  43   typedef std::map<Key, bool> StatusMap;
  44   StatusMap audio_status_map_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(MediaPlayersObserver);
  47 };
  48
  49 }  // namespace content
  50
  51 #endif  // CONTENT_BROWSER_ANDROID_MEDIA_PLAYERS_OBSERVER_H_