1 /* 2 * Copyright 2020 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 package android.media; 17 18 import android.annotation.NonNull; 19 import android.annotation.Nullable; 20 import android.annotation.SystemApi; 21 import android.annotation.SystemApi.Client; 22 import android.os.IBinder; 23 import android.os.ServiceManager; 24 25 /** 26 * Provides a way to register and obtain the system service binder objects managed by the media 27 * service. 28 * 29 * <p> Only the media mainline module will be able to access an instance of this class. 30 * @hide 31 */ 32 @SystemApi(client = Client.MODULE_LIBRARIES) 33 public class MediaServiceManager { 34 private static final String MEDIA_SESSION_SERVICE = "media_session"; 35 private static final String MEDIA_TRANSCODING_SERVICE = "media.transcoding"; 36 private static final String MEDIA_COMMUNICATION_SERVICE = "media_communication"; 37 38 /** 39 * @hide 40 */ MediaServiceManager()41 public MediaServiceManager() {} 42 43 /** 44 * A class that exposes the methods to register and obtain each system service. 45 */ 46 public static final class ServiceRegisterer { 47 private final String mServiceName; 48 private final boolean mLazyStart; 49 50 /** 51 * @hide 52 */ ServiceRegisterer(String serviceName, boolean lazyStart)53 public ServiceRegisterer(String serviceName, boolean lazyStart) { 54 mServiceName = serviceName; 55 mLazyStart = lazyStart; 56 } 57 58 /** 59 * @hide 60 */ ServiceRegisterer(String serviceName)61 public ServiceRegisterer(String serviceName) { 62 this(serviceName, false /*lazyStart*/); 63 } 64 65 /** 66 * Get the system server binding object for MediaServiceManager. 67 * 68 * <p> This blocks until the service instance is ready. 69 * or a timeout happens, in which case it returns null. 70 */ 71 @Nullable get()72 public IBinder get() { 73 if (mLazyStart) { 74 return ServiceManager.waitForService(mServiceName); 75 } 76 return ServiceManager.getService(mServiceName); 77 } 78 } 79 80 /** 81 * Returns {@link ServiceRegisterer} for MEDIA_SESSION_SERVICE. 82 */ 83 @NonNull getMediaSessionServiceRegisterer()84 public ServiceRegisterer getMediaSessionServiceRegisterer() { 85 return new ServiceRegisterer(MEDIA_SESSION_SERVICE); 86 } 87 88 /** 89 * Returns {@link ServiceRegisterer} for MEDIA_TRANSCODING_SERVICE. 90 */ 91 @NonNull getMediaTranscodingServiceRegisterer()92 public ServiceRegisterer getMediaTranscodingServiceRegisterer() { 93 return new ServiceRegisterer(MEDIA_TRANSCODING_SERVICE, true /*lazyStart*/); 94 } 95 96 /** 97 * Returns {@link ServiceRegisterer} for MEDIA_COMMUNICATION_SERVICE. 98 */ 99 @NonNull getMediaCommunicationServiceRegisterer()100 public ServiceRegisterer getMediaCommunicationServiceRegisterer() { 101 return new ServiceRegisterer(MEDIA_COMMUNICATION_SERVICE); 102 } 103 } 104