1/* 2** 3** Copyright 2008, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18//#define LOG_NDEBUG 0 19#define LOG_TAG "MediaMetadataRetriever" 20 21#include <utils/IServiceManager.h> 22#include <utils/IPCThreadState.h> 23#include <media/mediametadataretriever.h> 24#include <media/IMediaPlayerService.h> 25#include <utils/Log.h> 26#include <dlfcn.h> 27 28namespace android { 29 30// client singleton for binder interface to service 31Mutex MediaMetadataRetriever::sServiceLock; 32sp<IMediaPlayerService> MediaMetadataRetriever::sService; 33sp<MediaMetadataRetriever::DeathNotifier> MediaMetadataRetriever::sDeathNotifier; 34 35const sp<IMediaPlayerService>& MediaMetadataRetriever::getService() 36{ 37 Mutex::Autolock lock(sServiceLock); 38 if (sService.get() == 0) { 39 sp<IServiceManager> sm = defaultServiceManager(); 40 sp<IBinder> binder; 41 do { 42 binder = sm->getService(String16("media.player")); 43 if (binder != 0) { 44 break; 45 } 46 LOGW("MediaPlayerService not published, waiting..."); 47 usleep(500000); // 0.5 s 48 } while(true); 49 if (sDeathNotifier == NULL) { 50 sDeathNotifier = new DeathNotifier(); 51 } 52 binder->linkToDeath(sDeathNotifier); 53 sService = interface_cast<IMediaPlayerService>(binder); 54 } 55 LOGE_IF(sService == 0, "no MediaPlayerService!?"); 56 return sService; 57} 58 59MediaMetadataRetriever::MediaMetadataRetriever() 60{ 61 LOGV("constructor"); 62 const sp<IMediaPlayerService>& service(getService()); 63 if (service == 0) { 64 LOGE("failed to obtain MediaMetadataRetrieverService"); 65 return; 66 } 67 sp<IMediaMetadataRetriever> retriever(service->createMetadataRetriever(getpid())); 68 if (retriever == 0) { 69 LOGE("failed to create IMediaMetadataRetriever object from server"); 70 } 71 mRetriever = retriever; 72} 73 74MediaMetadataRetriever::~MediaMetadataRetriever() 75{ 76 LOGV("destructor"); 77 disconnect(); 78 IPCThreadState::self()->flushCommands(); 79} 80 81void MediaMetadataRetriever::disconnect() 82{ 83 LOGV("disconnect"); 84 sp<IMediaMetadataRetriever> retriever; 85 { 86 Mutex::Autolock _l(mLock); 87 retriever = mRetriever; 88 mRetriever.clear(); 89 } 90 if (retriever != 0) { 91 retriever->disconnect(); 92 } 93} 94 95status_t MediaMetadataRetriever::setDataSource(const char* srcUrl) 96{ 97 LOGV("setDataSource"); 98 if (mRetriever == 0) { 99 LOGE("retriever is not initialized"); 100 return INVALID_OPERATION; 101 } 102 if (srcUrl == NULL) { 103 LOGE("data source is a null pointer"); 104 return UNKNOWN_ERROR; 105 } 106 LOGV("data source (%s)", srcUrl); 107 return mRetriever->setDataSource(srcUrl); 108} 109 110status_t MediaMetadataRetriever::setDataSource(int fd, int64_t offset, int64_t length) 111{ 112 LOGV("setDataSource(%d, %lld, %lld)", fd, offset, length); 113 if (mRetriever == 0) { 114 LOGE("retriever is not initialized"); 115 return INVALID_OPERATION; 116 } 117 if (fd < 0 || offset < 0 || length < 0) { 118 LOGE("Invalid negative argument"); 119 return UNKNOWN_ERROR; 120 } 121 return mRetriever->setDataSource(fd, offset, length); 122} 123 124status_t MediaMetadataRetriever::setMode(int mode) 125{ 126 LOGV("setMode(%d)", mode); 127 if (mRetriever == 0) { 128 LOGE("retriever is not initialized"); 129 return INVALID_OPERATION; 130 } 131 return mRetriever->setMode(mode); 132} 133 134status_t MediaMetadataRetriever::getMode(int* mode) 135{ 136 LOGV("getMode"); 137 if (mRetriever == 0) { 138 LOGE("retriever is not initialized"); 139 return INVALID_OPERATION; 140 } 141 return mRetriever->getMode(mode); 142} 143 144sp<IMemory> MediaMetadataRetriever::captureFrame() 145{ 146 LOGV("captureFrame"); 147 if (mRetriever == 0) { 148 LOGE("retriever is not initialized"); 149 return NULL; 150 } 151 return mRetriever->captureFrame(); 152} 153 154const char* MediaMetadataRetriever::extractMetadata(int keyCode) 155{ 156 LOGV("extractMetadata(%d)", keyCode); 157 if (mRetriever == 0) { 158 LOGE("retriever is not initialized"); 159 return NULL; 160 } 161 return mRetriever->extractMetadata(keyCode); 162} 163 164sp<IMemory> MediaMetadataRetriever::extractAlbumArt() 165{ 166 LOGV("extractAlbumArt"); 167 if (mRetriever == 0) { 168 LOGE("retriever is not initialized"); 169 return NULL; 170 } 171 return mRetriever->extractAlbumArt(); 172} 173 174void MediaMetadataRetriever::DeathNotifier::binderDied(const wp<IBinder>& who) { 175 Mutex::Autolock lock(MediaMetadataRetriever::sServiceLock); 176 MediaMetadataRetriever::sService.clear(); 177 LOGW("MediaMetadataRetriever server died!"); 178} 179 180MediaMetadataRetriever::DeathNotifier::~DeathNotifier() 181{ 182 Mutex::Autolock lock(sServiceLock); 183 if (sService != 0) { 184 sService->asBinder()->unlinkToDeath(this); 185 } 186} 187 188}; // namespace android 189