mediametadataretriever.cpp revision 1b86fe063badb5f28c467ade39be0f4008688947
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/IMediaHTTPService.h> 25#include <media/IMediaPlayerService.h> 26#include <utils/Log.h> 27#include <dlfcn.h> 28 29namespace android { 30 31// client singleton for binder interface to service 32Mutex MediaMetadataRetriever::sServiceLock; 33sp<IMediaPlayerService> MediaMetadataRetriever::sService; 34sp<MediaMetadataRetriever::DeathNotifier> MediaMetadataRetriever::sDeathNotifier; 35 36const sp<IMediaPlayerService>& MediaMetadataRetriever::getService() 37{ 38 Mutex::Autolock lock(sServiceLock); 39 if (sService == 0) { 40 sp<IServiceManager> sm = defaultServiceManager(); 41 sp<IBinder> binder; 42 do { 43 binder = sm->getService(String16("media.player")); 44 if (binder != 0) { 45 break; 46 } 47 ALOGW("MediaPlayerService not published, waiting..."); 48 usleep(500000); // 0.5 s 49 } while (true); 50 if (sDeathNotifier == NULL) { 51 sDeathNotifier = new DeathNotifier(); 52 } 53 binder->linkToDeath(sDeathNotifier); 54 sService = interface_cast<IMediaPlayerService>(binder); 55 } 56 ALOGE_IF(sService == 0, "no MediaPlayerService!?"); 57 return sService; 58} 59 60MediaMetadataRetriever::MediaMetadataRetriever() 61{ 62 ALOGV("constructor"); 63 const sp<IMediaPlayerService>& service(getService()); 64 if (service == 0) { 65 ALOGE("failed to obtain MediaMetadataRetrieverService"); 66 return; 67 } 68 sp<IMediaMetadataRetriever> retriever(service->createMetadataRetriever()); 69 if (retriever == 0) { 70 ALOGE("failed to create IMediaMetadataRetriever object from server"); 71 } 72 mRetriever = retriever; 73} 74 75MediaMetadataRetriever::~MediaMetadataRetriever() 76{ 77 ALOGV("destructor"); 78 disconnect(); 79 IPCThreadState::self()->flushCommands(); 80} 81 82void MediaMetadataRetriever::disconnect() 83{ 84 ALOGV("disconnect"); 85 sp<IMediaMetadataRetriever> retriever; 86 { 87 Mutex::Autolock _l(mLock); 88 retriever = mRetriever; 89 mRetriever.clear(); 90 } 91 if (retriever != 0) { 92 retriever->disconnect(); 93 } 94} 95 96status_t MediaMetadataRetriever::setDataSource( 97 const sp<IMediaHTTPService> &httpService, 98 const char *srcUrl, 99 const KeyedVector<String8, String8> *headers) 100{ 101 ALOGV("setDataSource"); 102 Mutex::Autolock _l(mLock); 103 if (mRetriever == 0) { 104 ALOGE("retriever is not initialized"); 105 return INVALID_OPERATION; 106 } 107 if (srcUrl == NULL) { 108 ALOGE("data source is a null pointer"); 109 return UNKNOWN_ERROR; 110 } 111 ALOGV("data source (%s)", srcUrl); 112 return mRetriever->setDataSource(httpService, srcUrl, headers); 113} 114 115status_t MediaMetadataRetriever::setDataSource(int fd, int64_t offset, int64_t length) 116{ 117 ALOGV("setDataSource(%d, %lld, %lld)", fd, offset, length); 118 Mutex::Autolock _l(mLock); 119 if (mRetriever == 0) { 120 ALOGE("retriever is not initialized"); 121 return INVALID_OPERATION; 122 } 123 if (fd < 0 || offset < 0 || length < 0) { 124 ALOGE("Invalid negative argument"); 125 return UNKNOWN_ERROR; 126 } 127 return mRetriever->setDataSource(fd, offset, length); 128} 129 130sp<IMemory> MediaMetadataRetriever::getFrameAtTime(int64_t timeUs, int option) 131{ 132 ALOGV("getFrameAtTime: time(%lld us) option(%d)", timeUs, option); 133 Mutex::Autolock _l(mLock); 134 if (mRetriever == 0) { 135 ALOGE("retriever is not initialized"); 136 return NULL; 137 } 138 return mRetriever->getFrameAtTime(timeUs, option); 139} 140 141const char* MediaMetadataRetriever::extractMetadata(int keyCode) 142{ 143 ALOGV("extractMetadata(%d)", keyCode); 144 Mutex::Autolock _l(mLock); 145 if (mRetriever == 0) { 146 ALOGE("retriever is not initialized"); 147 return NULL; 148 } 149 return mRetriever->extractMetadata(keyCode); 150} 151 152sp<IMemory> MediaMetadataRetriever::extractAlbumArt() 153{ 154 ALOGV("extractAlbumArt"); 155 Mutex::Autolock _l(mLock); 156 if (mRetriever == 0) { 157 ALOGE("retriever is not initialized"); 158 return NULL; 159 } 160 return mRetriever->extractAlbumArt(); 161} 162 163void MediaMetadataRetriever::DeathNotifier::binderDied(const wp<IBinder>& who __unused) { 164 Mutex::Autolock lock(MediaMetadataRetriever::sServiceLock); 165 MediaMetadataRetriever::sService.clear(); 166 ALOGW("MediaMetadataRetriever server died!"); 167} 168 169MediaMetadataRetriever::DeathNotifier::~DeathNotifier() 170{ 171 Mutex::Autolock lock(sServiceLock); 172 if (sService != 0) { 173 sService->asBinder()->unlinkToDeath(this); 174 } 175} 176 177}; // namespace android 178