| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.media; |
| |
| import android.content.Context; |
| import android.media.session.IMediaSession; |
| import android.media.session.IMediaSessionCallback; |
| import android.media.session.IMediaSessionManager; |
| import android.os.Binder; |
| import android.os.RemoteException; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| import com.android.server.SystemService; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * System implementation of MediaSessionManager |
| */ |
| public class MediaSessionService extends SystemService { |
| private static final String TAG = "MediaSessionService"; |
| private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG); |
| |
| private final SessionManagerImpl mSessionManagerImpl; |
| |
| private final ArrayList<MediaSessionRecord> mSessions |
| = new ArrayList<MediaSessionRecord>(); |
| private final Object mLock = new Object(); |
| |
| public MediaSessionService(Context context) { |
| super(context); |
| mSessionManagerImpl = new SessionManagerImpl(); |
| } |
| |
| @Override |
| public void onStart() { |
| publishBinderService(Context.MEDIA_SESSION_SERVICE, mSessionManagerImpl); |
| } |
| |
| void sessionDied(MediaSessionRecord session) { |
| synchronized (mSessions) { |
| destroySessionLocked(session); |
| } |
| } |
| |
| void destroySession(MediaSessionRecord session) { |
| synchronized (mSessions) { |
| destroySessionLocked(session); |
| } |
| } |
| |
| private void destroySessionLocked(MediaSessionRecord session) { |
| mSessions.remove(session); |
| } |
| |
| private void enforcePackageName(String packageName, int uid) { |
| if (TextUtils.isEmpty(packageName)) { |
| throw new IllegalArgumentException("packageName may not be empty"); |
| } |
| String[] packages = getContext().getPackageManager().getPackagesForUid(uid); |
| final int packageCount = packages.length; |
| for (int i = 0; i < packageCount; i++) { |
| if (packageName.equals(packages[i])) { |
| return; |
| } |
| } |
| throw new IllegalArgumentException("packageName is not owned by the calling process"); |
| } |
| |
| private MediaSessionRecord createSessionInternal(int pid, String packageName, |
| IMediaSessionCallback cb, String tag) { |
| synchronized (mLock) { |
| return createSessionLocked(pid, packageName, cb, tag); |
| } |
| } |
| |
| private MediaSessionRecord createSessionLocked(int pid, String packageName, |
| IMediaSessionCallback cb, String tag) { |
| final MediaSessionRecord session = new MediaSessionRecord(pid, packageName, cb, tag, this); |
| try { |
| cb.asBinder().linkToDeath(session, 0); |
| } catch (RemoteException e) { |
| throw new RuntimeException("Media Session owner died prematurely.", e); |
| } |
| synchronized (mSessions) { |
| mSessions.add(session); |
| } |
| if (DEBUG) { |
| Log.d(TAG, "Created session for package " + packageName + " with tag " + tag); |
| } |
| return session; |
| } |
| |
| class SessionManagerImpl extends IMediaSessionManager.Stub { |
| @Override |
| public IMediaSession createSession(String packageName, IMediaSessionCallback cb, String tag) |
| throws RemoteException { |
| final int pid = Binder.getCallingPid(); |
| final int uid = Binder.getCallingUid(); |
| final long token = Binder.clearCallingIdentity(); |
| try { |
| enforcePackageName(packageName, uid); |
| if (cb == null) { |
| throw new IllegalArgumentException("Controller callback cannot be null"); |
| } |
| return createSessionInternal(pid, packageName, cb, tag).getSessionBinder(); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| } |
| } |
| |
| } |