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
17package com.android.server.media;
18
19import android.app.ActivityManager;
20import android.app.ActivityManagerNative;
21import android.content.Context;
22import android.content.Intent;
23import android.media.IMediaResourceMonitor;
24import android.os.Binder;
25import android.os.RemoteException;
26import android.os.UserHandle;
27import android.util.Log;
28import android.util.Slog;
29import com.android.server.SystemService;
30
31import java.util.List;
32
33/** This class provides a system service that monitors media resource usage. */
34public class MediaResourceMonitorService extends SystemService {
35    private static final String TAG = "MediaResourceMonitor";
36    private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
37
38    private static final String SERVICE_NAME = "media_resource_monitor";
39
40    private final MediaResourceMonitorImpl mMediaResourceMonitorImpl;
41
42    public MediaResourceMonitorService(Context context) {
43        super(context);
44        mMediaResourceMonitorImpl = new MediaResourceMonitorImpl();
45    }
46
47    @Override
48    public void onStart() {
49        publishBinderService(SERVICE_NAME, mMediaResourceMonitorImpl);
50    }
51
52    class MediaResourceMonitorImpl extends IMediaResourceMonitor.Stub {
53        @Override
54        public void notifyResourceGranted(int pid, int type)
55                throws RemoteException {
56            if (DEBUG) {
57                Slog.d(TAG, "notifyResourceGranted(pid=" + pid + ", type=" + type + ")");
58            }
59            final long identity = Binder.clearCallingIdentity();
60            try {
61                String pkgNames[] = getPackageNamesFromPid(pid);
62                if (pkgNames != null) {
63                    Intent intent = new Intent(Intent.ACTION_MEDIA_RESOURCE_GRANTED);
64                    intent.putExtra(Intent.EXTRA_PACKAGES, pkgNames);
65                    intent.putExtra(Intent.EXTRA_MEDIA_RESOURCE_TYPE, type);
66                    getContext().sendBroadcastAsUser(intent,
67                            new UserHandle(ActivityManager.getCurrentUser()),
68                            android.Manifest.permission.RECEIVE_MEDIA_RESOURCE_USAGE);
69                }
70            } finally {
71                Binder.restoreCallingIdentity(identity);
72            }
73        }
74
75        private String[] getPackageNamesFromPid(int pid) {
76            try {
77                for (ActivityManager.RunningAppProcessInfo proc :
78                        ActivityManagerNative.getDefault().getRunningAppProcesses()) {
79                    if (proc.pid == pid) {
80                        return proc.pkgList;
81                    }
82                }
83            } catch (RemoteException e) {
84                Slog.w(TAG, "ActivityManager.getRunningAppProcesses() failed");
85            }
86            return null;
87        }
88    }
89}
90