RoboErik | 01fe661 | 2014-02-13 14:19:04 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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.content.Context; |
RoboErik | 2f5b057 | 2014-02-21 10:30:38 -0800 | [diff] [blame] | 20 | import android.media.session.IMediaSession; |
| 21 | import android.media.session.IMediaSessionCallback; |
| 22 | import android.media.session.IMediaSessionManager; |
RoboErik | 01fe661 | 2014-02-13 14:19:04 -0800 | [diff] [blame] | 23 | import android.os.Binder; |
RoboErik | 8ae0f34 | 2014-02-24 18:02:08 -0800 | [diff] [blame^] | 24 | import android.os.Handler; |
RoboErik | 01fe661 | 2014-02-13 14:19:04 -0800 | [diff] [blame] | 25 | import android.os.RemoteException; |
| 26 | import android.text.TextUtils; |
| 27 | import android.util.Log; |
| 28 | |
| 29 | import com.android.server.SystemService; |
| 30 | |
| 31 | import java.util.ArrayList; |
| 32 | |
| 33 | /** |
| 34 | * System implementation of MediaSessionManager |
| 35 | */ |
| 36 | public class MediaSessionService extends SystemService { |
| 37 | private static final String TAG = "MediaSessionService"; |
| 38 | private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG); |
| 39 | |
| 40 | private final SessionManagerImpl mSessionManagerImpl; |
| 41 | |
| 42 | private final ArrayList<MediaSessionRecord> mSessions |
| 43 | = new ArrayList<MediaSessionRecord>(); |
| 44 | private final Object mLock = new Object(); |
RoboErik | 8ae0f34 | 2014-02-24 18:02:08 -0800 | [diff] [blame^] | 45 | // TODO do we want a separate thread for handling mediasession messages? |
| 46 | private final Handler mHandler = new Handler(); |
RoboErik | 01fe661 | 2014-02-13 14:19:04 -0800 | [diff] [blame] | 47 | |
| 48 | public MediaSessionService(Context context) { |
| 49 | super(context); |
| 50 | mSessionManagerImpl = new SessionManagerImpl(); |
| 51 | } |
| 52 | |
| 53 | @Override |
| 54 | public void onStart() { |
| 55 | publishBinderService(Context.MEDIA_SESSION_SERVICE, mSessionManagerImpl); |
| 56 | } |
| 57 | |
| 58 | void sessionDied(MediaSessionRecord session) { |
| 59 | synchronized (mSessions) { |
| 60 | destroySessionLocked(session); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | void destroySession(MediaSessionRecord session) { |
| 65 | synchronized (mSessions) { |
| 66 | destroySessionLocked(session); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | private void destroySessionLocked(MediaSessionRecord session) { |
| 71 | mSessions.remove(session); |
| 72 | } |
| 73 | |
| 74 | private void enforcePackageName(String packageName, int uid) { |
| 75 | if (TextUtils.isEmpty(packageName)) { |
| 76 | throw new IllegalArgumentException("packageName may not be empty"); |
| 77 | } |
| 78 | String[] packages = getContext().getPackageManager().getPackagesForUid(uid); |
| 79 | final int packageCount = packages.length; |
| 80 | for (int i = 0; i < packageCount; i++) { |
| 81 | if (packageName.equals(packages[i])) { |
| 82 | return; |
| 83 | } |
| 84 | } |
| 85 | throw new IllegalArgumentException("packageName is not owned by the calling process"); |
| 86 | } |
| 87 | |
| 88 | private MediaSessionRecord createSessionInternal(int pid, String packageName, |
| 89 | IMediaSessionCallback cb, String tag) { |
| 90 | synchronized (mLock) { |
| 91 | return createSessionLocked(pid, packageName, cb, tag); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | private MediaSessionRecord createSessionLocked(int pid, String packageName, |
| 96 | IMediaSessionCallback cb, String tag) { |
RoboErik | 8ae0f34 | 2014-02-24 18:02:08 -0800 | [diff] [blame^] | 97 | final MediaSessionRecord session = new MediaSessionRecord(pid, packageName, cb, tag, this, |
| 98 | mHandler); |
RoboErik | 01fe661 | 2014-02-13 14:19:04 -0800 | [diff] [blame] | 99 | try { |
| 100 | cb.asBinder().linkToDeath(session, 0); |
| 101 | } catch (RemoteException e) { |
| 102 | throw new RuntimeException("Media Session owner died prematurely.", e); |
| 103 | } |
| 104 | synchronized (mSessions) { |
| 105 | mSessions.add(session); |
| 106 | } |
| 107 | if (DEBUG) { |
| 108 | Log.d(TAG, "Created session for package " + packageName + " with tag " + tag); |
| 109 | } |
| 110 | return session; |
| 111 | } |
| 112 | |
| 113 | class SessionManagerImpl extends IMediaSessionManager.Stub { |
| 114 | @Override |
| 115 | public IMediaSession createSession(String packageName, IMediaSessionCallback cb, String tag) |
| 116 | throws RemoteException { |
| 117 | final int pid = Binder.getCallingPid(); |
| 118 | final int uid = Binder.getCallingUid(); |
| 119 | final long token = Binder.clearCallingIdentity(); |
| 120 | try { |
| 121 | enforcePackageName(packageName, uid); |
| 122 | if (cb == null) { |
| 123 | throw new IllegalArgumentException("Controller callback cannot be null"); |
| 124 | } |
| 125 | return createSessionInternal(pid, packageName, cb, tag).getSessionBinder(); |
| 126 | } finally { |
| 127 | Binder.restoreCallingIdentity(token); |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | } |