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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server.media;
     18 
     19 import android.app.ActivityManager;
     20 import android.app.ActivityManagerNative;
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.media.IMediaResourceMonitor;
     24 import android.os.Binder;
     25 import android.os.RemoteException;
     26 import android.os.UserHandle;
     27 import android.os.UserManager;
     28 import android.util.Log;
     29 import android.util.Slog;
     30 import com.android.server.SystemService;
     31 
     32 import java.util.List;
     33 
     34 /** This class provides a system service that monitors media resource usage. */
     35 public class MediaResourceMonitorService extends SystemService {
     36     private static final String TAG = "MediaResourceMonitor";
     37     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
     38 
     39     private static final String SERVICE_NAME = "media_resource_monitor";
     40 
     41     private final MediaResourceMonitorImpl mMediaResourceMonitorImpl;
     42 
     43     public MediaResourceMonitorService(Context context) {
     44         super(context);
     45         mMediaResourceMonitorImpl = new MediaResourceMonitorImpl();
     46     }
     47 
     48     @Override
     49     public void onStart() {
     50         publishBinderService(SERVICE_NAME, mMediaResourceMonitorImpl);
     51     }
     52 
     53     class MediaResourceMonitorImpl extends IMediaResourceMonitor.Stub {
     54         @Override
     55         public void notifyResourceGranted(int pid, int type)
     56                 throws RemoteException {
     57             if (DEBUG) {
     58                 Slog.d(TAG, "notifyResourceGranted(pid=" + pid + ", type=" + type + ")");
     59             }
     60             final long identity = Binder.clearCallingIdentity();
     61             try {
     62                 String pkgNames[] = getPackageNamesFromPid(pid);
     63                 if (pkgNames == null) {
     64                     return;
     65                 }
     66                 UserManager manager = (UserManager) getContext().getSystemService(
     67                         Context.USER_SERVICE);
     68                 int[] userIds = manager.getEnabledProfileIds(ActivityManager.getCurrentUser());
     69                 if (userIds == null || userIds.length == 0) {
     70                     return;
     71                 }
     72                 Intent intent = new Intent(Intent.ACTION_MEDIA_RESOURCE_GRANTED);
     73                 intent.putExtra(Intent.EXTRA_PACKAGES, pkgNames);
     74                 intent.putExtra(Intent.EXTRA_MEDIA_RESOURCE_TYPE, type);
     75                 for (int userId : userIds) {
     76                     getContext().sendBroadcastAsUser(intent, UserHandle.of(userId),
     77                             android.Manifest.permission.RECEIVE_MEDIA_RESOURCE_USAGE);
     78                 }
     79             } finally {
     80                 Binder.restoreCallingIdentity(identity);
     81             }
     82         }
     83 
     84         private String[] getPackageNamesFromPid(int pid) {
     85             try {
     86                 for (ActivityManager.RunningAppProcessInfo proc :
     87                         ActivityManagerNative.getDefault().getRunningAppProcesses()) {
     88                     if (proc.pid == pid) {
     89                         return proc.pkgList;
     90                     }
     91                 }
     92             } catch (RemoteException e) {
     93                 Slog.w(TAG, "ActivityManager.getRunningAppProcesses() failed");
     94             }
     95             return null;
     96         }
     97     }
     98 }
     99