Adding the logic for releasing decoder resources in WebMediaPlayerManagerAndroid

webkit/media/android/webmediaplayer_manager_android.cc

 // 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.
 
 #include "webkit/media/android/webmediaplayer_manager_android.h"
 
 #include "webkit/media/android/webmediaplayer_android.h"
 
+// Threshold on the number of media players per renderer before we start
+// attempting to release inactive media players.
+static const int kMediaPlayerThreshold = 2;
+
 namespace webkit_media {
 
 WebMediaPlayerManagerAndroid::WebMediaPlayerManagerAndroid()
     : next_media_player_id_(0) {
 }
 
-WebMediaPlayerManagerAndroid::~WebMediaPlayerManagerAndroid() {}
+WebMediaPlayerManagerAndroid::~WebMediaPlayerManagerAndroid() {
+  ReleaseMediaResources();
+}
 
 int WebMediaPlayerManagerAndroid::RegisterMediaPlayer(
     WebMediaPlayerAndroid* player) {
-  MediaPlayerInfo info;
-  info.player = player;
-  media_players_[next_media_player_id_] = info;
+  media_players_[next_media_player_id_] = player;
   return next_media_player_id_++;
 }
 
 void WebMediaPlayerManagerAndroid::UnregisterMediaPlayer(int player_id) {
-  std::map<int32, MediaPlayerInfo>::iterator iter =
+  std::map<int32, WebMediaPlayerAndroid*>::iterator iter =
       media_players_.find(player_id);
   DCHECK(iter != media_players_.end());
 
   media_players_.erase(player_id);
 }
 
+void WebMediaPlayerManagerAndroid::RequestMediaResources(int player_id) {
+  std::map<int32, WebMediaPlayerAndroid*>::iterator iter =
+      media_players_.find(player_id);
+  DCHECK(iter != media_players_.end());
+
+  if ((iter->second)->IsInitialized())
+    return;
+
+  // Release active players that are paused. Because we only release paused
+  // players, the number of running players could go beyond the limit.
+  // TODO(qinmin): we should use LRU to release the oldest player if we are
+  // reaching hardware limit.
+  if (GetActivePlayerCount() < kMediaPlayerThreshold)
+    return;
+
+  std::map<int32, WebMediaPlayerAndroid*>::iterator player_it;
+  for (player_it = media_players_.begin();
+       player_it != media_players_.end(); ++player_it) {
+    WebMediaPlayerAndroid* player = player_it->second;
+    if (player->IsInitialized() && player->paused())
+      player->ReleaseMediaResources();
+  }
+}
+
 void WebMediaPlayerManagerAndroid::ReleaseMediaResources() {
-  std::map<int32, MediaPlayerInfo>::iterator player_it;
+  std::map<int32, WebMediaPlayerAndroid*>::iterator player_it;
   for (player_it = media_players_.begin();
       player_it != media_players_.end(); ++player_it) {
-    (player_it->second).player->ReleaseMediaResources();
+    (player_it->second)->ReleaseMediaResources();
   }
 }
 
+int32 WebMediaPlayerManagerAndroid::GetActivePlayerCount() {
+  int32 count = 0;
+  std::map<int32, WebMediaPlayerAndroid*>::iterator iter;
+  for (iter = media_players_.begin(); iter != media_players_.end(); ++iter) {
+    if ((iter->second)->IsInitialized())
+      count++;
+  }
+  return count;
+}
+
 WebMediaPlayerAndroid* WebMediaPlayerManagerAndroid::GetMediaPlayer(
     int player_id) {
-  std::map<int32, MediaPlayerInfo>::iterator iter =
+  std::map<int32, WebMediaPlayerAndroid*>::iterator iter =
       media_players_.find(player_id);
   if (iter != media_players_.end())
-    return (iter->second).player;
+    return iter->second;
   return NULL;
 }
 
 }  // namespace webkit_media