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/*
** Copyright 2010, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "IMediaDeathNotifier"
#include <utils/Log.h>
#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>
#include <media/IMediaDeathNotifier.h>
namespace android {
// client singleton for binder interface to services
Mutex IMediaDeathNotifier::sServiceLock;
sp<IMediaPlayerService> IMediaDeathNotifier::sMediaPlayerService;
sp<IMediaDeathNotifier::DeathNotifier> IMediaDeathNotifier::sDeathNotifier;
SortedVector< wp<IMediaDeathNotifier> > IMediaDeathNotifier::sObitRecipients;
// establish binder interface to MediaPlayerService
/*static*/const sp<IMediaPlayerService>
IMediaDeathNotifier::getMediaPlayerService()
{
ALOGV("getMediaPlayerService");
Mutex::Autolock _l(sServiceLock);
if (sMediaPlayerService == 0) {
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder;
do {
binder = sm->getService(String16("media.player"));
if (binder != 0) {
break;
}
ALOGW("Media player service not published, waiting...");
usleep(500000); // 0.5 s
} while (true);
if (sDeathNotifier == NULL) {
sDeathNotifier = new DeathNotifier();
}
binder->linkToDeath(sDeathNotifier);
sMediaPlayerService = interface_cast<IMediaPlayerService>(binder);
}
ALOGE_IF(sMediaPlayerService == 0, "no media player service!?");
return sMediaPlayerService;
}
/*static*/ void
IMediaDeathNotifier::addObitRecipient(const wp<IMediaDeathNotifier>& recipient)
{
ALOGV("addObitRecipient");
Mutex::Autolock _l(sServiceLock);
sObitRecipients.add(recipient);
}
/*static*/ void
IMediaDeathNotifier::removeObitRecipient(const wp<IMediaDeathNotifier>& recipient)
{
ALOGV("removeObitRecipient");
Mutex::Autolock _l(sServiceLock);
sObitRecipients.remove(recipient);
}
void
IMediaDeathNotifier::DeathNotifier::binderDied(const wp<IBinder>& who __unused) {
ALOGW("media server died");
// Need to do this with the lock held
SortedVector< wp<IMediaDeathNotifier> > list;
{
Mutex::Autolock _l(sServiceLock);
sMediaPlayerService.clear();
list = sObitRecipients;
}
// Notify application when media server dies.
// Don't hold the static lock during callback in case app
// makes a call that needs the lock.
size_t count = list.size();
for (size_t iter = 0; iter < count; ++iter) {
sp<IMediaDeathNotifier> notifier = list[iter].promote();
if (notifier != 0) {
notifier->died();
}
}
}
IMediaDeathNotifier::DeathNotifier::~DeathNotifier()
{
ALOGV("DeathNotifier::~DeathNotifier");
Mutex::Autolock _l(sServiceLock);
sObitRecipients.clear();
if (sMediaPlayerService != 0) {
IInterface::asBinder(sMediaPlayerService)->unlinkToDeath(this);
}
}
} // namespace android
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