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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
#include "MediaControlService.h"
#include "MediaController.h"
#include "MediaControlUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/intl/Localization.h"
#include "mozilla/Logging.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs_media.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/Telemetry.h"
#include "nsIObserverService.h"
#include "nsXULAppAPI.h"
using mozilla::intl::Localization;
#undef LOG
#define LOG(msg, ...) \
MOZ_LOG(gMediaControlLog, LogLevel::Debug, \
("MediaControlService=%p, " msg, this, ##__VA_ARGS__))
#undef LOG_MAINCONTROLLER
#define LOG_MAINCONTROLLER(msg, ...) \
MOZ_LOG(gMediaControlLog, LogLevel::Debug, (msg, ##__VA_ARGS__))
#undef LOG_MAINCONTROLLER_INFO
#define LOG_MAINCONTROLLER_INFO(msg, ...) \
MOZ_LOG(gMediaControlLog, LogLevel::Info, (msg, ##__VA_ARGS__))
namespace mozilla::dom {
StaticRefPtr<MediaControlService> gMediaControlService;
static bool sIsXPCOMShutdown = false;
/* static */
RefPtr<MediaControlService> MediaControlService::GetService() {
MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess(),
"MediaControlService only runs on Chrome process!");
if (sIsXPCOMShutdown) {
return nullptr;
}
if (!gMediaControlService) {
gMediaControlService = new MediaControlService();
gMediaControlService->Init();
}
RefPtr<MediaControlService> service = gMediaControlService.get();
return service;
}
/* static */
void MediaControlService::GenerateMediaControlKey(const GlobalObject& global,
MediaControlKey aKey,
double aSeekTime) {
RefPtr<MediaControlService> service = MediaControlService::GetService();
if (service) {
service->GenerateTestMediaControlKey(aKey, aSeekTime);
}
}
/* static */
void MediaControlService::GetCurrentActiveMediaMetadata(
const GlobalObject& aGlobal, MediaMetadataInit& aMetadata) {
if (RefPtr<MediaControlService> service = MediaControlService::GetService()) {
MediaMetadataBase metadata = service->GetMainControllerMediaMetadata();
aMetadata.mTitle = metadata.mTitle;
aMetadata.mArtist = metadata.mArtist;
aMetadata.mAlbum = metadata.mAlbum;
for (const auto& artwork : metadata.mArtwork) {
// If OOM happens resulting in not able to append the element, then we
// would get incorrect result and fail on test, so we don't need to throw
// an error explicitly.
if (MediaImage* image = aMetadata.mArtwork.AppendElement(fallible)) {
image->mSrc = artwork.mSrc;
image->mSizes = artwork.mSizes;
image->mType = artwork.mType;
}
}
}
}
/* static */
MediaSessionPlaybackState
MediaControlService::GetCurrentMediaSessionPlaybackState(
GlobalObject& aGlobal) {
if (RefPtr<MediaControlService> service = MediaControlService::GetService()) {
return service->GetMainControllerPlaybackState();
}
return MediaSessionPlaybackState::None;
}
NS_INTERFACE_MAP_BEGIN(MediaControlService)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(MediaControlService)
NS_IMPL_RELEASE(MediaControlService)
MediaControlService::MediaControlService() {
LOG("create media control service");
RefPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->AddObserver(this, "xpcom-shutdown", false);
}
}
void MediaControlService::Init() {
mMediaKeysHandler = new MediaControlKeyHandler();
mMediaControlKeyManager = new MediaControlKeyManager();
mMediaControlKeyManager->AddListener(mMediaKeysHandler.get());
mControllerManager = MakeUnique<ControllerManager>(this);
// Initialize the fallback title
nsTArray<nsCString> resIds{
"branding/brand.ftl"_ns,
"dom/media.ftl"_ns,
};
RefPtr<Localization> l10n = Localization::Create(resIds, true);
{
nsAutoCString translation;
IgnoredErrorResult rv;
l10n->FormatValueSync("mediastatus-fallback-title"_ns, {}, translation, rv);
if (!rv.Failed()) {
mFallbackTitle = NS_ConvertUTF8toUTF16(translation);
}
}
}
MediaControlService::~MediaControlService() {
LOG("destroy media control service");
Shutdown();
}
NS_IMETHODIMP
MediaControlService::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (!strcmp(aTopic, "xpcom-shutdown")) {
LOG("XPCOM shutdown");
MOZ_ASSERT(gMediaControlService);
RefPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, "xpcom-shutdown");
}
Shutdown();
sIsXPCOMShutdown = true;
gMediaControlService = nullptr;
}
return NS_OK;
}
void MediaControlService::Shutdown() {
mControllerManager->Shutdown();
mMediaControlKeyManager->RemoveListener(mMediaKeysHandler.get());
}
bool MediaControlService::RegisterActiveMediaController(
MediaController* aController) {
MOZ_DIAGNOSTIC_ASSERT(mControllerManager,
"Register controller before initializing service");
if (!mControllerManager->AddController(aController)) {
LOG("Fail to register controller %" PRId64, aController->Id());
return false;
}
LOG("Register media controller %" PRId64 ", currentNum=%" PRId64,
aController->Id(), GetActiveControllersNum());
if (StaticPrefs::media_mediacontrol_testingevents_enabled()) {
if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
obs->NotifyObservers(nullptr, "media-controller-amount-changed", nullptr);
}
}
return true;
}
bool MediaControlService::UnregisterActiveMediaController(
MediaController* aController) {
MOZ_DIAGNOSTIC_ASSERT(mControllerManager,
"Unregister controller before initializing service");
if (!mControllerManager->RemoveController(aController)) {
LOG("Fail to unregister controller %" PRId64, aController->Id());
return false;
}
LOG("Unregister media controller %" PRId64 ", currentNum=%" PRId64,
aController->Id(), GetActiveControllersNum());
if (StaticPrefs::media_mediacontrol_testingevents_enabled()) {
if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
obs->NotifyObservers(nullptr, "media-controller-amount-changed", nullptr);
}
}
return true;
}
void MediaControlService::NotifyControllerPlaybackStateChanged(
MediaController* aController) {
MOZ_DIAGNOSTIC_ASSERT(
mControllerManager,
"controller state change happens before initializing service");
MOZ_DIAGNOSTIC_ASSERT(aController);
// The controller is not an active controller.
if (!mControllerManager->Contains(aController)) {
return;
}
// The controller is the main controller, propagate its playback state.
if (GetMainController() == aController) {
mControllerManager->MainControllerPlaybackStateChanged(
aController->PlaybackState());
return;
}
// The controller is not the main controller, but will become a new main
// controller. As the service can contains multiple controllers and only one
// controller can be controlled by media control keys. Therefore, when
// controller's state becomes `playing`, then we would like to let that
// controller being controlled, rather than other controller which might not
// be playing at the time.
if (GetMainController() != aController &&
aController->PlaybackState() == MediaSessionPlaybackState::Playing) {
mControllerManager->UpdateMainControllerIfNeeded(aController);
}
}
void MediaControlService::RequestUpdateMainController(
MediaController* aController) {
MOZ_DIAGNOSTIC_ASSERT(aController);
MOZ_DIAGNOSTIC_ASSERT(
mControllerManager,
"using controller in PIP mode before initializing service");
// The controller is not an active controller.
if (!mControllerManager->Contains(aController)) {
return;
}
mControllerManager->UpdateMainControllerIfNeeded(aController);
}
uint64_t MediaControlService::GetActiveControllersNum() const {
MOZ_DIAGNOSTIC_ASSERT(mControllerManager);
return mControllerManager->GetControllersNum();
}
MediaController* MediaControlService::GetMainController() const {
MOZ_DIAGNOSTIC_ASSERT(mControllerManager);
return mControllerManager->GetMainController();
}
void MediaControlService::GenerateTestMediaControlKey(MediaControlKey aKey,
double aSeekValue) {
if (!StaticPrefs::media_mediacontrol_testingevents_enabled()) {
return;
}
// Generate seek details when necessary
switch (aKey) {
case MediaControlKey::Seekto:
mMediaKeysHandler->OnActionPerformed(MediaControlAction(
aKey, SeekDetails(aSeekValue, false /* fast seek */)));
break;
case MediaControlKey::Seekbackward:
case MediaControlKey::Seekforward:
mMediaKeysHandler->OnActionPerformed(
MediaControlAction(aKey, SeekDetails(aSeekValue)));
break;
default:
mMediaKeysHandler->OnActionPerformed(MediaControlAction(aKey));
}
}
MediaMetadataBase MediaControlService::GetMainControllerMediaMetadata() const {
MediaMetadataBase metadata;
if (!StaticPrefs::media_mediacontrol_testingevents_enabled()) {
return metadata;
}
return GetMainController() ? GetMainController()->GetCurrentMediaMetadata()
: metadata;
}
MediaSessionPlaybackState MediaControlService::GetMainControllerPlaybackState()
const {
if (!StaticPrefs::media_mediacontrol_testingevents_enabled()) {
return MediaSessionPlaybackState::None;
}
return GetMainController() ? GetMainController()->PlaybackState()
: MediaSessionPlaybackState::None;
}
nsString MediaControlService::GetFallbackTitle() const {
return mFallbackTitle;
}
// Following functions belong to ControllerManager
MediaControlService::ControllerManager::ControllerManager(
MediaControlService* aService)
: mSource(aService->GetMediaControlKeySource()) {
MOZ_ASSERT(mSource);
}
bool MediaControlService::ControllerManager::AddController(
MediaController* aController) {
MOZ_DIAGNOSTIC_ASSERT(aController);
if (mControllers.contains(aController)) {
return false;
}
mControllers.insertBack(aController);
UpdateMainControllerIfNeeded(aController);
return true;
}
bool MediaControlService::ControllerManager::RemoveController(
MediaController* aController) {
MOZ_DIAGNOSTIC_ASSERT(aController);
if (!mControllers.contains(aController)) {
return false;
}
// This is LinkedListElement's method which will remove controller from
// `mController`.
static_cast<LinkedListControllerPtr>(aController)->remove();
// If main controller is removed from the list, the last controller in the
// list would become the main controller. Or reset the main controller when
// the list is already empty.
if (GetMainController() == aController) {
UpdateMainControllerInternal(
mControllers.isEmpty() ? nullptr : mControllers.getLast());
}
return true;
}
void MediaControlService::ControllerManager::UpdateMainControllerIfNeeded(
MediaController* aController) {
MOZ_DIAGNOSTIC_ASSERT(aController);
if (GetMainController() == aController) {
LOG_MAINCONTROLLER("This controller is alreay the main controller");
return;
}
if (GetMainController() &&
GetMainController()->IsBeingUsedInPIPModeOrFullscreen() &&
!aController->IsBeingUsedInPIPModeOrFullscreen()) {
LOG_MAINCONTROLLER(
"Normal media controller can't replace the controller being used in "
"PIP mode or fullscreen");
return ReorderGivenController(aController,
InsertOptions::eInsertAsNormalController);
}
ReorderGivenController(aController, InsertOptions::eInsertAsMainController);
UpdateMainControllerInternal(aController);
}
void MediaControlService::ControllerManager::ReorderGivenController(
MediaController* aController, InsertOptions aOption) {
MOZ_DIAGNOSTIC_ASSERT(aController);
MOZ_DIAGNOSTIC_ASSERT(mControllers.contains(aController));
// Reset the controller's position and make it not in any list.
static_cast<LinkedListControllerPtr>(aController)->remove();
if (aOption == InsertOptions::eInsertAsMainController) {
// Make the main controller as the last element in the list to maintain the
// order of controllers because we always use the last controller in the
// list as the next main controller when removing current main controller
// from the list. Eg. If the list contains [A, B, C], and now the last
// element C is the main controller. When B becomes main controller later,
// the list would become [A, C, B]. And if A becomes main controller, list
// would become [C, B, A]. Then, if we remove A from the list, the next main
// controller would be B. But if we don't maintain the controller order when
// main controller changes, we would pick C as the main controller because
// the list is still [A, B, C].
return mControllers.insertBack(aController);
}
MOZ_ASSERT(aOption == InsertOptions::eInsertAsNormalController);
MOZ_ASSERT(GetMainController() != aController);
// We might have multiple controllers which have higher priority (being used
// in PIP or fullscreen) from the head, the normal controller should be
// inserted before them. Therefore, search a higher priority controller from
// the head and insert new controller before it.
// Eg. a list [A, B, C, D, E] and D and E have higher priority, if we want
// to insert F, then the final result would be [A, B, C, F, D, E]
auto* current = static_cast<LinkedListControllerPtr>(mControllers.getFirst());
while (!static_cast<MediaController*>(current)
->IsBeingUsedInPIPModeOrFullscreen()) {
current = current->getNext();
}
MOZ_ASSERT(current, "Should have at least one higher priority controller!");
current->setPrevious(aController);
}
void MediaControlService::ControllerManager::Shutdown() {
mControllers.clear();
DisconnectMainControllerEvents();
}
void MediaControlService::ControllerManager::MainControllerPlaybackStateChanged(
MediaSessionPlaybackState aState) {
MOZ_ASSERT(NS_IsMainThread());
mSource->SetPlaybackState(aState);
}
void MediaControlService::ControllerManager::MainControllerMetadataChanged(
const MediaMetadataBase& aMetadata) {
MOZ_ASSERT(NS_IsMainThread());
mSource->SetMediaMetadata(aMetadata);
}
void MediaControlService::ControllerManager::UpdateMainControllerInternal(
MediaController* aController) {
MOZ_ASSERT(NS_IsMainThread());
if (aController) {
aController->Select();
}
if (mMainController) {
mMainController->Unselect();
}
mMainController = aController;
if (!mMainController) {
LOG_MAINCONTROLLER_INFO("Clear main controller");
mSource->Close();
DisconnectMainControllerEvents();
} else {
LOG_MAINCONTROLLER_INFO("Set controller %" PRId64 " as main controller",
mMainController->Id());
if (!mSource->Open()) {
LOG("Failed to open source for monitoring media keys");
}
// We would still update those status to the event source even if it failed
// to open, because it would save the result and set them to the real
// source when it opens. In addition, another benefit to do that is to
// prevent testing from affecting by platform specific issues, because our
// testing events rely on those status changes and they are all platform
// independent.
mSource->SetPlaybackState(mMainController->PlaybackState());
mSource->SetMediaMetadata(mMainController->GetCurrentMediaMetadata());
mSource->SetSupportedMediaKeys(mMainController->GetSupportedMediaKeys());
mSource->SetPositionState(mMainController->GetCurrentPositionState());
ConnectMainControllerEvents();
}
if (StaticPrefs::media_mediacontrol_testingevents_enabled()) {
if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
obs->NotifyObservers(nullptr, "main-media-controller-changed", nullptr);
}
}
}
void MediaControlService::ControllerManager::ConnectMainControllerEvents() {
// As main controller has been changed, we should disconnect listeners from
// the previous controller and reconnect them to the new controller.
DisconnectMainControllerEvents();
// Listen to main controller's event in order to propagate the content that
// might be displayed on the virtual control interface created by the source.
mMetadataChangedListener = mMainController->MetadataChangedEvent().Connect(
AbstractThread::MainThread(), this,
&ControllerManager::MainControllerMetadataChanged);
mSupportedKeysChangedListener =
mMainController->SupportedKeysChangedEvent().Connect(
AbstractThread::MainThread(),
[this](const MediaKeysArray& aSupportedKeys) {
mSource->SetSupportedMediaKeys(aSupportedKeys);
});
mFullScreenChangedListener =
mMainController->FullScreenChangedEvent().Connect(
AbstractThread::MainThread(), [this](bool aIsEnabled) {
mSource->SetEnableFullScreen(aIsEnabled);
});
mPictureInPictureModeChangedListener =
mMainController->PictureInPictureModeChangedEvent().Connect(
AbstractThread::MainThread(), [this](bool aIsEnabled) {
mSource->SetEnablePictureInPictureMode(aIsEnabled);
});
mPositionChangedListener = mMainController->PositionChangedEvent().Connect(
AbstractThread::MainThread(), [this](const Maybe<PositionState>& aState) {
mSource->SetPositionState(aState);
});
}
void MediaControlService::ControllerManager::DisconnectMainControllerEvents() {
mMetadataChangedListener.DisconnectIfExists();
mSupportedKeysChangedListener.DisconnectIfExists();
mFullScreenChangedListener.DisconnectIfExists();
mPictureInPictureModeChangedListener.DisconnectIfExists();
mPositionChangedListener.DisconnectIfExists();
}
MediaController* MediaControlService::ControllerManager::GetMainController()
const {
return mMainController.get();
}
uint64_t MediaControlService::ControllerManager::GetControllersNum() const {
return mControllers.length();
}
bool MediaControlService::ControllerManager::Contains(
MediaController* aController) const {
return mControllers.contains(aController);
}
} // namespace mozilla::dom