James Dong | 34bbc22 | 2010-01-15 18:13:58 -0800 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright 2010, 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 | |
| 17 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "IMediaDeathNotifier" |
| 19 | #include <utils/Log.h> |
| 20 | |
| 21 | #include <binder/IServiceManager.h> |
| 22 | #include <binder/IPCThreadState.h> |
| 23 | #include <media/IMediaDeathNotifier.h> |
| 24 | |
| 25 | namespace android { |
| 26 | |
| 27 | // client singleton for binder interface to services |
| 28 | Mutex IMediaDeathNotifier::sServiceLock; |
| 29 | sp<IMediaPlayerService> IMediaDeathNotifier::sMediaPlayerService; |
| 30 | sp<IMediaDeathNotifier::DeathNotifier> IMediaDeathNotifier::sDeathNotifier; |
| 31 | SortedVector< wp<IMediaDeathNotifier> > IMediaDeathNotifier::sObitRecipients; |
| 32 | |
| 33 | // establish binder interface to MediaPlayerService |
| 34 | /*static*/const sp<IMediaPlayerService>& |
| 35 | IMediaDeathNotifier::getMediaPlayerService() |
| 36 | { |
| 37 | LOGV("getMediaPlayerService"); |
| 38 | Mutex::Autolock _l(sServiceLock); |
| 39 | if (sMediaPlayerService.get() == 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 | LOGW("Media player service not published, waiting..."); |
| 48 | usleep(500000); // 0.5 s |
| 49 | } while(true); |
| 50 | |
| 51 | if (sDeathNotifier == NULL) { |
| 52 | sDeathNotifier = new DeathNotifier(); |
| 53 | } |
| 54 | binder->linkToDeath(sDeathNotifier); |
| 55 | sMediaPlayerService = interface_cast<IMediaPlayerService>(binder); |
| 56 | } |
| 57 | LOGE_IF(sMediaPlayerService == 0, "no media player service!?"); |
| 58 | return sMediaPlayerService; |
| 59 | } |
| 60 | |
| 61 | /*static*/ void |
| 62 | IMediaDeathNotifier::addObitRecipient(const wp<IMediaDeathNotifier>& recipient) |
| 63 | { |
| 64 | LOGV("addObitRecipient"); |
| 65 | Mutex::Autolock _l(sServiceLock); |
| 66 | sObitRecipients.add(recipient); |
| 67 | } |
| 68 | |
| 69 | /*static*/ void |
| 70 | IMediaDeathNotifier::removeObitRecipient(const wp<IMediaDeathNotifier>& recipient) |
| 71 | { |
| 72 | LOGV("removeObitRecipient"); |
| 73 | Mutex::Autolock _l(sServiceLock); |
| 74 | sObitRecipients.remove(recipient); |
| 75 | } |
| 76 | |
| 77 | void |
| 78 | IMediaDeathNotifier::DeathNotifier::binderDied(const wp<IBinder>& who) { |
| 79 | LOGW("media server died"); |
| 80 | |
| 81 | // Need to do this with the lock held |
| 82 | SortedVector< wp<IMediaDeathNotifier> > list; |
| 83 | { |
| 84 | Mutex::Autolock _l(sServiceLock); |
| 85 | sMediaPlayerService.clear(); |
| 86 | list = sObitRecipients; |
| 87 | } |
| 88 | |
| 89 | // Notify application when media server dies. |
| 90 | // Don't hold the static lock during callback in case app |
| 91 | // makes a call that needs the lock. |
| 92 | size_t count = list.size(); |
| 93 | for (size_t iter = 0; iter < count; ++iter) { |
| 94 | sp<IMediaDeathNotifier> notifier = list[iter].promote(); |
| 95 | if (notifier != 0) { |
| 96 | notifier->died(); |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | IMediaDeathNotifier::DeathNotifier::~DeathNotifier() |
| 102 | { |
| 103 | LOGV("DeathNotifier::~DeathNotifier"); |
| 104 | Mutex::Autolock _l(sServiceLock); |
| 105 | sObitRecipients.clear(); |
| 106 | if (sMediaPlayerService != 0) { |
| 107 | sMediaPlayerService->asBinder()->unlinkToDeath(this); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | }; // namespace android |