mediametadataretriever.cpp revision 29357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47
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 <binder/IServiceManager.h> 22#include <binder/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 ALOGW("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 ALOGE_IF(sService == 0, "no MediaPlayerService!?"); 56 return sService; 57} 58 59MediaMetadataRetriever::MediaMetadataRetriever() 60{ 61 ALOGV("constructor"); 62 const sp<IMediaPlayerService>& service(getService()); 63 if (service == 0) { 64 ALOGE("failed to obtain MediaMetadataRetrieverService"); 65 return; 66 } 67 sp<IMediaMetadataRetriever> retriever(service->createMetadataRetriever(getpid())); 68 if (retriever == 0) { 69 ALOGE("failed to create IMediaMetadataRetriever object from server"); 70 } 71 mRetriever = retriever; 72} 73 74MediaMetadataRetriever::~MediaMetadataRetriever() 75{ 76 ALOGV("destructor"); 77 disconnect(); 78 IPCThreadState::self()->flushCommands(); 79} 80 81void MediaMetadataRetriever::disconnect() 82{ 83 ALOGV("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( 96 const char *srcUrl, const KeyedVector<String8, String8> *headers) 97{ 98 ALOGV("setDataSource"); 99 Mutex::Autolock _l(mLock); 100 if (mRetriever == 0) { 101 ALOGE("retriever is not initialized"); 102 return INVALID_OPERATION; 103 } 104 if (srcUrl == NULL) { 105 ALOGE("data source is a null pointer"); 106 return UNKNOWN_ERROR; 107 } 108 ALOGV("data source (%s)", srcUrl); 109 return mRetriever->setDataSource(srcUrl, headers); 110} 111 112status_t MediaMetadataRetriever::setDataSource(int fd, int64_t offset, int64_t length) 113{ 114 ALOGV("setDataSource(%d, %lld, %lld)", fd, offset, length); 115 Mutex::Autolock _l(mLock); 116 if (mRetriever == 0) { 117 ALOGE("retriever is not initialized"); 118 return INVALID_OPERATION; 119 } 120 if (fd < 0 || offset < 0 || length < 0) { 121 ALOGE("Invalid negative argument"); 122 return UNKNOWN_ERROR; 123 } 124 return mRetriever->setDataSource(fd, offset, length); 125} 126 127sp<IMemory> MediaMetadataRetriever::getFrameAtTime(int64_t timeUs, int option) 128{ 129 ALOGV("getFrameAtTime: time(%lld us) option(%d)", timeUs, option); 130 Mutex::Autolock _l(mLock); 131 if (mRetriever == 0) { 132 ALOGE("retriever is not initialized"); 133 return NULL; 134 } 135 return mRetriever->getFrameAtTime(timeUs, option); 136} 137 138const char* MediaMetadataRetriever::extractMetadata(int keyCode) 139{ 140 ALOGV("extractMetadata(%d)", keyCode); 141 Mutex::Autolock _l(mLock); 142 if (mRetriever == 0) { 143 ALOGE("retriever is not initialized"); 144 return NULL; 145 } 146 return mRetriever->extractMetadata(keyCode); 147} 148 149sp<IMemory> MediaMetadataRetriever::extractAlbumArt() 150{ 151 ALOGV("extractAlbumArt"); 152 Mutex::Autolock _l(mLock); 153 if (mRetriever == 0) { 154 ALOGE("retriever is not initialized"); 155 return NULL; 156 } 157 return mRetriever->extractAlbumArt(); 158} 159 160void MediaMetadataRetriever::DeathNotifier::binderDied(const wp<IBinder>& who) { 161 Mutex::Autolock lock(MediaMetadataRetriever::sServiceLock); 162 MediaMetadataRetriever::sService.clear(); 163 ALOGW("MediaMetadataRetriever server died!"); 164} 165 166MediaMetadataRetriever::DeathNotifier::~DeathNotifier() 167{ 168 Mutex::Autolock lock(sServiceLock); 169 if (sService != 0) { 170 sService->asBinder()->unlinkToDeath(this); 171 } 172} 173 174}; // namespace android 175