Adding the logic for releasing decoder resources in WebMediaPlayerManagerAndroid

webkit/media/android/webmediaplayer_manager_android.h

 // Copyright (c) 2012 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 WEBKIT_MEDIA_ANDROID_WEBMEDIAPLAYER_MANAGER_ANDROID_H_
 #define WEBKIT_MEDIA_ANDROID_WEBMEDIAPLAYER_MANAGER_ANDROID_H_
 #pragma once
 
 #include <jni.h>
 #include <map>
 
 #include "base/basictypes.h"
 
 namespace webkit_media {
 
 class WebMediaPlayerAndroid;
 
 // Class for managing all the WebMediaPlayerAndroid objects in a renderer
 // process.
 class WebMediaPlayerManagerAndroid {
  public:
   WebMediaPlayerManagerAndroid();
   ~WebMediaPlayerManagerAndroid();
 
   // Register and unregister a WebMediaPlayerAndroid object.
   int RegisterMediaPlayer(WebMediaPlayerAndroid* player);
   void UnregisterMediaPlayer(int player_id);
 
+  // Called when a mediaplayer starts to decode media. If the number
+  // of active decoders hits the limit, release some resources.
+  // TODO(qinmin): we need to classify between video and audio decoders.
+  // Audio decoders are inexpensive. And css animations often come with
+  // lots of small audio files.
+  void RequestMediaResources(int player_id);
+
   // Release all the media resources on the renderer process.
   void ReleaseMediaResources();
 
   // Get the pointer to WebMediaPlayerAndroid given the |player_id|.
   WebMediaPlayerAndroid* GetMediaPlayer(int player_id);
 
  private:
-  // Information needed to manage WebMediaPlayerAndroid.
-  // TODO(qinmin): more informations will be added here for resource management.
-  struct MediaPlayerInfo {
-    webkit_media::WebMediaPlayerAndroid* player;
-  };
+  // Get the number of active players.
+  int32 GetActivePlayerCount();
 
   // Info for all available WebMediaPlayerAndroid on a page; kept so that
   // we can enumerate them to send updates about tab focus and visibily.
-  std::map<int32, MediaPlayerInfo> media_players_;
+  std::map<int32, WebMediaPlayerAndroid*> media_players_;
 
   int32 next_media_player_id_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerManagerAndroid);
 };
 
 }  // namespace webkit_media
 
 #endif  // WEBKIT_MEDIA_ANDROID_WEBMEDIAPLAYER_MANAGER_ANDROID_H_