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/*
* Copyright (C) 2020 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 "TranscodingResourcePolicy"
#include <aidl/android/media/BnResourceObserver.h>
#include <aidl/android/media/IResourceObserverService.h>
#include <android/binder_manager.h>
#include <android/binder_process.h>
#include <map>
#include <media/TranscodingResourcePolicy.h>
#include <utils/Log.h>
namespace android {
using Status = ::ndk::ScopedAStatus;
using ::aidl::android::media::BnResourceObserver;
using ::aidl::android::media::IResourceObserverService;
using ::aidl::android::media::MediaObservableEvent;
using ::aidl::android::media::MediaObservableFilter;
using ::aidl::android::media::MediaObservableParcel;
using ::aidl::android::media::MediaObservableType;
static std::string toString(const MediaObservableParcel& observable) {
return "{" + ::aidl::android::media::toString(observable.type) + ", " +
std::to_string(observable.value) + "}";
}
struct TranscodingResourcePolicy::ResourceObserver : public BnResourceObserver {
explicit ResourceObserver(TranscodingResourcePolicy* owner) : mOwner(owner) {}
// IResourceObserver
::ndk::ScopedAStatus onStatusChanged(
MediaObservableEvent event, int32_t uid, int32_t pid,
const std::vector<MediaObservableParcel>& observables) override {
ALOGD("%s: %s, uid %d, pid %d, %s", __FUNCTION__,
::aidl::android::media::toString(event).c_str(), uid, pid,
toString(observables[0]).c_str());
// Only report kIdle event.
if (((uint64_t)event & (uint64_t)MediaObservableEvent::kIdle) != 0) {
for (auto& observable : observables) {
if (observable.type == MediaObservableType::kVideoSecureCodec ||
observable.type == MediaObservableType::kVideoNonSecureCodec) {
mOwner->onResourceAvailable(pid);
break;
}
}
}
return ::ndk::ScopedAStatus::ok();
}
TranscodingResourcePolicy* mOwner;
};
// cookie used for death recipients. The TranscodingResourcePolicy
// that this cookie is associated with must outlive this cookie. It is
// either deleted by binderDied, or in unregisterSelf which is also called
// in the destructor of TranscodingResourcePolicy
class TranscodingResourcePolicyCookie {
public:
TranscodingResourcePolicyCookie(TranscodingResourcePolicy* policy) : mPolicy(policy) {}
TranscodingResourcePolicyCookie() = delete;
TranscodingResourcePolicy* mPolicy;
};
static std::map<uintptr_t, std::unique_ptr<TranscodingResourcePolicyCookie>> sCookies;
static uintptr_t sCookieKeyCounter;
static std::mutex sCookiesMutex;
// static
void TranscodingResourcePolicy::BinderDiedCallback(void* cookie) {
std::lock_guard<std::mutex> guard(sCookiesMutex);
if (auto it = sCookies.find(reinterpret_cast<uintptr_t>(cookie)); it != sCookies.end()) {
ALOGI("BinderDiedCallback unregistering TranscodingResourcePolicy");
auto policy = reinterpret_cast<TranscodingResourcePolicy*>(it->second->mPolicy);
if (policy) {
policy->unregisterSelf();
}
sCookies.erase(it);
}
// TODO(chz): retry to connecting to IResourceObserverService after failure.
// Also need to have back-up logic if IResourceObserverService is offline for
// Prolonged period of time. A possible alternative could be, during period where
// IResourceObserverService is not available, trigger onResourceAvailable() everytime
// when top uid changes (in hope that'll free up some codec instances that we could
// reclaim).
}
TranscodingResourcePolicy::TranscodingResourcePolicy()
: mRegistered(false),
mResourceLostPid(-1),
mDeathRecipient(AIBinder_DeathRecipient_new(BinderDiedCallback)) {
registerSelf();
}
TranscodingResourcePolicy::~TranscodingResourcePolicy() {
{
std::lock_guard<std::mutex> guard(sCookiesMutex);
// delete all of the cookies associated with this TranscodingResourcePolicy
// instance since they are holding pointers to this object that will no
// longer be valid.
for (auto it = sCookies.begin(); it != sCookies.end();) {
const uintptr_t key = it->first;
std::lock_guard guard(mCookieKeysLock);
if (mCookieKeys.find(key) != mCookieKeys.end()) {
// No longer need to track this cookie
mCookieKeys.erase(key);
it = sCookies.erase(it);
} else {
it++;
}
}
}
unregisterSelf();
}
void TranscodingResourcePolicy::registerSelf() {
ALOGI("TranscodingResourcePolicy: registerSelf");
::ndk::SpAIBinder binder(AServiceManager_getService("media.resource_observer"));
std::scoped_lock lock{mRegisteredLock};
if (mRegistered) {
return;
}
// TODO(chz): retry to connecting to IResourceObserverService after failure.
mService = IResourceObserverService::fromBinder(binder);
if (mService == nullptr) {
ALOGE("Failed to get IResourceObserverService");
return;
}
// Only register filters for codec resource available.
mObserver = ::ndk::SharedRefBase::make<ResourceObserver>(this);
std::vector<MediaObservableFilter> filters = {
{MediaObservableType::kVideoSecureCodec, MediaObservableEvent::kIdle},
{MediaObservableType::kVideoNonSecureCodec, MediaObservableEvent::kIdle}};
Status status = mService->registerObserver(mObserver, filters);
if (!status.isOk()) {
ALOGE("failed to register: error %d", status.getServiceSpecificError());
mService = nullptr;
mObserver = nullptr;
return;
}
std::unique_ptr<TranscodingResourcePolicyCookie> cookie =
std::make_unique<TranscodingResourcePolicyCookie>(this);
uintptr_t cookieKey = sCookieKeyCounter++;
sCookies.emplace(cookieKey, std::move(cookie));
{
std::lock_guard guard(mCookieKeysLock);
mCookieKeys.insert(cookieKey);
}
AIBinder_linkToDeath(binder.get(), mDeathRecipient.get(), reinterpret_cast<void*>(cookieKey));
ALOGD("@@@ registered observer");
mRegistered = true;
}
void TranscodingResourcePolicy::unregisterSelf() {
ALOGI("TranscodingResourcePolicy: unregisterSelf");
std::scoped_lock lock{mRegisteredLock};
if (!mRegistered) {
return;
}
::ndk::SpAIBinder binder = mService->asBinder();
if (binder.get() != nullptr) {
Status status = mService->unregisterObserver(mObserver);
}
mService = nullptr;
mObserver = nullptr;
mRegistered = false;
}
void TranscodingResourcePolicy::setCallback(
const std::shared_ptr<ResourcePolicyCallbackInterface>& cb) {
std::scoped_lock lock{mCallbackLock};
mResourcePolicyCallback = cb;
}
void TranscodingResourcePolicy::setPidResourceLost(pid_t pid) {
std::scoped_lock lock{mCallbackLock};
mResourceLostPid = pid;
}
void TranscodingResourcePolicy::onResourceAvailable(pid_t pid) {
std::shared_ptr<ResourcePolicyCallbackInterface> cb;
{
std::scoped_lock lock{mCallbackLock};
// Only callback if codec resource is released from other processes.
if (mResourceLostPid != -1 && mResourceLostPid != pid) {
cb = mResourcePolicyCallback.lock();
mResourceLostPid = -1;
}
}
if (cb != nullptr) {
cb->onResourceAvailable();
}
}
} // namespace android
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