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-rw-r--r--dom/media/mediacontrol/MediaController.cpp560
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diff --git a/dom/media/mediacontrol/MediaController.cpp b/dom/media/mediacontrol/MediaController.cpp
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+++ b/dom/media/mediacontrol/MediaController.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "MediaController.h"
+
+#include "MediaControlService.h"
+#include "MediaControlUtils.h"
+#include "MediaControlKeySource.h"
+#include "mozilla/AsyncEventDispatcher.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
+#include "mozilla/dom/MediaSession.h"
+#include "mozilla/dom/PositionStateEvent.h"
+
+// avoid redefined macro in unified build
+#undef LOG
+#define LOG(msg, ...) \
+ MOZ_LOG(gMediaControlLog, LogLevel::Debug, \
+ ("MediaController=%p, Id=%" PRId64 ", " msg, this, this->Id(), \
+ ##__VA_ARGS__))
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaController, DOMEventTargetHelper)
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(MediaController,
+ DOMEventTargetHelper,
+ nsITimerCallback, nsINamed)
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(MediaController,
+ DOMEventTargetHelper)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+nsISupports* MediaController::GetParentObject() const {
+ RefPtr<BrowsingContext> bc = BrowsingContext::Get(Id());
+ return bc;
+}
+
+JSObject* MediaController::WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) {
+ return MediaController_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void MediaController::GetSupportedKeys(
+ nsTArray<MediaControlKey>& aRetVal) const {
+ aRetVal.Clear();
+ for (const auto& key : mSupportedKeys) {
+ aRetVal.AppendElement(key);
+ }
+}
+
+void MediaController::GetMetadata(MediaMetadataInit& aMetadata,
+ ErrorResult& aRv) {
+ if (!IsActive() || mShutdown) {
+ aRv.Throw(NS_ERROR_NOT_AVAILABLE);
+ return;
+ }
+
+ const MediaMetadataBase metadata = GetCurrentMediaMetadata();
+ aMetadata.mTitle = metadata.mTitle;
+ aMetadata.mArtist = metadata.mArtist;
+ aMetadata.mAlbum = metadata.mAlbum;
+ for (const auto& artwork : metadata.mArtwork) {
+ if (MediaImage* image = aMetadata.mArtwork.AppendElement(fallible)) {
+ image->mSrc = artwork.mSrc;
+ image->mSizes = artwork.mSizes;
+ image->mType = artwork.mType;
+ } else {
+ aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+ return;
+ }
+ }
+}
+
+static const MediaControlKey sDefaultSupportedKeys[] = {
+ MediaControlKey::Focus, MediaControlKey::Play, MediaControlKey::Pause,
+ MediaControlKey::Playpause, MediaControlKey::Stop,
+};
+
+static void GetDefaultSupportedKeys(nsTArray<MediaControlKey>& aKeys) {
+ for (const auto& key : sDefaultSupportedKeys) {
+ aKeys.AppendElement(key);
+ }
+}
+
+MediaController::MediaController(uint64_t aBrowsingContextId)
+ : MediaStatusManager(aBrowsingContextId) {
+ MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess(),
+ "MediaController only runs on Chrome process!");
+ LOG("Create controller %" PRId64, Id());
+ GetDefaultSupportedKeys(mSupportedKeys);
+ mSupportedActionsChangedListener = SupportedActionsChangedEvent().Connect(
+ AbstractThread::MainThread(), this,
+ &MediaController::HandleSupportedMediaSessionActionsChanged);
+ mPlaybackChangedListener = PlaybackChangedEvent().Connect(
+ AbstractThread::MainThread(), this,
+ &MediaController::HandleActualPlaybackStateChanged);
+ mPositionStateChangedListener = PositionChangedEvent().Connect(
+ AbstractThread::MainThread(), this,
+ &MediaController::HandlePositionStateChanged);
+ mMetadataChangedListener =
+ MetadataChangedEvent().Connect(AbstractThread::MainThread(), this,
+ &MediaController::HandleMetadataChanged);
+}
+
+MediaController::~MediaController() {
+ LOG("Destroy controller %" PRId64, Id());
+ if (!mShutdown) {
+ Shutdown();
+ }
+};
+
+void MediaController::Focus() {
+ LOG("Focus");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Focus));
+}
+
+void MediaController::Play() {
+ LOG("Play");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Play));
+}
+
+void MediaController::Pause() {
+ LOG("Pause");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Pause));
+}
+
+void MediaController::PrevTrack() {
+ LOG("Prev Track");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Previoustrack));
+}
+
+void MediaController::NextTrack() {
+ LOG("Next Track");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Nexttrack));
+}
+
+void MediaController::SeekBackward() {
+ LOG("Seek Backward");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Seekbackward));
+}
+
+void MediaController::SeekForward() {
+ LOG("Seek Forward");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Seekforward));
+}
+
+void MediaController::SkipAd() {
+ LOG("Skip Ad");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Skipad));
+}
+
+void MediaController::SeekTo(double aSeekTime, bool aFastSeek) {
+ LOG("Seek To");
+ UpdateMediaControlActionToContentMediaIfNeeded(MediaControlAction(
+ MediaControlKey::Seekto, SeekDetails(aSeekTime, aFastSeek)));
+}
+
+void MediaController::Stop() {
+ LOG("Stop");
+ UpdateMediaControlActionToContentMediaIfNeeded(
+ MediaControlAction(MediaControlKey::Stop));
+ MediaStatusManager::ClearActiveMediaSessionContextIdIfNeeded();
+}
+
+uint64_t MediaController::Id() const { return mTopLevelBrowsingContextId; }
+
+bool MediaController::IsAudible() const { return IsMediaAudible(); }
+
+bool MediaController::IsPlaying() const { return IsMediaPlaying(); }
+
+bool MediaController::IsActive() const { return mIsActive; };
+
+bool MediaController::ShouldPropagateActionToAllContexts(
+ const MediaControlAction& aAction) const {
+ // These three actions have default action handler for each frame, so we
+ // need to propagate to all contexts. We would handle default handlers in
+ // `ContentMediaController::HandleMediaKey`.
+ return aAction.mKey == MediaControlKey::Play ||
+ aAction.mKey == MediaControlKey::Pause ||
+ aAction.mKey == MediaControlKey::Stop;
+}
+
+void MediaController::UpdateMediaControlActionToContentMediaIfNeeded(
+ const MediaControlAction& aAction) {
+ // If the controller isn't active or it has been shutdown, we don't need to
+ // update media action to the content process.
+ if (!mIsActive || mShutdown) {
+ return;
+ }
+
+ // For some actions which have default action handler, we want to propagate
+ // them on all contexts in order to trigger the default handler on each
+ // context separately. Otherwise, other action should only be propagated to
+ // the context where active media session exists.
+ const bool propateToAll = ShouldPropagateActionToAllContexts(aAction);
+ const uint64_t targetContextId = propateToAll || !mActiveMediaSessionContextId
+ ? Id()
+ : *mActiveMediaSessionContextId;
+ RefPtr<BrowsingContext> context = BrowsingContext::Get(targetContextId);
+ if (!context || context->IsDiscarded()) {
+ return;
+ }
+
+ if (propateToAll) {
+ context->PreOrderWalk([&](BrowsingContext* bc) {
+ bc->Canonical()->UpdateMediaControlAction(aAction);
+ });
+ } else {
+ context->Canonical()->UpdateMediaControlAction(aAction);
+ }
+ RefPtr<MediaControlService> service = MediaControlService::GetService();
+ MOZ_ASSERT(service);
+ service->NotifyMediaControlHasEverBeenUsed();
+}
+
+void MediaController::Shutdown() {
+ MOZ_ASSERT(!mShutdown, "Do not call shutdown twice!");
+ // The media controller would be removed from the service when we receive a
+ // notification from the content process about all controlled media has been
+ // stoppped. However, if controlled media is stopped after detaching
+ // browsing context, then sending the notification from the content process
+ // would fail so that we are not able to notify the chrome process to remove
+ // the corresponding controller. Therefore, we should manually remove the
+ // controller from the service.
+ Deactivate();
+ mShutdown = true;
+ mSupportedActionsChangedListener.DisconnectIfExists();
+ mPlaybackChangedListener.DisconnectIfExists();
+ mPositionStateChangedListener.DisconnectIfExists();
+ mMetadataChangedListener.DisconnectIfExists();
+}
+
+void MediaController::NotifyMediaPlaybackChanged(uint64_t aBrowsingContextId,
+ MediaPlaybackState aState) {
+ if (mShutdown) {
+ return;
+ }
+ MediaStatusManager::NotifyMediaPlaybackChanged(aBrowsingContextId, aState);
+ UpdateDeactivationTimerIfNeeded();
+ UpdateActivatedStateIfNeeded();
+}
+
+void MediaController::UpdateDeactivationTimerIfNeeded() {
+ if (!StaticPrefs::media_mediacontrol_stopcontrol_timer()) {
+ return;
+ }
+
+ bool shouldBeAlwaysActive = IsPlaying() || IsBeingUsedInPIPModeOrFullscreen();
+ if (shouldBeAlwaysActive && mDeactivationTimer) {
+ LOG("Cancel deactivation timer");
+ mDeactivationTimer->Cancel();
+ mDeactivationTimer = nullptr;
+ } else if (!shouldBeAlwaysActive && !mDeactivationTimer) {
+ nsresult rv = NS_NewTimerWithCallback(
+ getter_AddRefs(mDeactivationTimer), this,
+ StaticPrefs::media_mediacontrol_stopcontrol_timer_ms(),
+ nsITimer::TYPE_ONE_SHOT, AbstractThread::MainThread());
+ if (NS_SUCCEEDED(rv)) {
+ LOG("Create a deactivation timer");
+ } else {
+ LOG("Failed to create a deactivation timer");
+ }
+ }
+}
+
+bool MediaController::IsBeingUsedInPIPModeOrFullscreen() const {
+ return mIsInPictureInPictureMode || mIsInFullScreenMode;
+}
+
+NS_IMETHODIMP MediaController::Notify(nsITimer* aTimer) {
+ mDeactivationTimer = nullptr;
+ if (!StaticPrefs::media_mediacontrol_stopcontrol_timer()) {
+ return NS_OK;
+ }
+
+ if (mShutdown) {
+ LOG("Cancel deactivation timer because controller has been shutdown");
+ return NS_OK;
+ }
+
+ // As the media being used in the PIP mode or fullscreen would always display
+ // on the screen, users would have high chance to interact with it again, so
+ // we don't want to stop media control.
+ if (IsBeingUsedInPIPModeOrFullscreen()) {
+ LOG("Cancel deactivation timer because controller is in PIP mode");
+ return NS_OK;
+ }
+
+ if (IsPlaying()) {
+ LOG("Cancel deactivation timer because controller is still playing");
+ return NS_OK;
+ }
+
+ if (!mIsActive) {
+ LOG("Cancel deactivation timer because controller has been deactivated");
+ return NS_OK;
+ }
+ Deactivate();
+ return NS_OK;
+}
+
+NS_IMETHODIMP MediaController::GetName(nsACString& aName) {
+ aName.AssignLiteral("MediaController");
+ return NS_OK;
+}
+
+void MediaController::NotifyMediaAudibleChanged(uint64_t aBrowsingContextId,
+ MediaAudibleState aState) {
+ if (mShutdown) {
+ return;
+ }
+
+ bool oldAudible = IsAudible();
+ MediaStatusManager::NotifyMediaAudibleChanged(aBrowsingContextId, aState);
+ if (IsAudible() == oldAudible) {
+ return;
+ }
+ UpdateActivatedStateIfNeeded();
+
+ // Request the audio focus amongs different controllers that could cause
+ // pausing other audible controllers if we enable the audio focus management.
+ RefPtr<MediaControlService> service = MediaControlService::GetService();
+ MOZ_ASSERT(service);
+ if (IsAudible()) {
+ service->GetAudioFocusManager().RequestAudioFocus(this);
+ } else {
+ service->GetAudioFocusManager().RevokeAudioFocus(this);
+ }
+}
+
+bool MediaController::ShouldActivateController() const {
+ MOZ_ASSERT(!mShutdown);
+ // After media is successfully loaded and match our critiera, such as its
+ // duration is longer enough, which is used to exclude the notification-ish
+ // sound, then it would be able to be controlled once the controll gets
+ // activated.
+ //
+ // Activating a controller means that we would start to intercept the media
+ // keys on the platform and show the virtual control interface (if needed).
+ // The controller would be activated when (1) controllable media starts in the
+ // browsing context that controller belongs to (2) controllable media enters
+ // fullscreen or PIP mode.
+ return IsAnyMediaBeingControlled() &&
+ (IsPlaying() || IsBeingUsedInPIPModeOrFullscreen()) && !mIsActive;
+}
+
+bool MediaController::ShouldDeactivateController() const {
+ MOZ_ASSERT(!mShutdown);
+ // If we don't have an active media session and no controlled media exists,
+ // then we don't need to keep controller active, because there is nothing to
+ // control. However, if we still have an active media session, then we should
+ // keep controller active in order to receive media keys even if we don't have
+ // any controlled media existing, because a website might start other media
+ // when media session receives media keys.
+ return !IsAnyMediaBeingControlled() && mIsActive &&
+ !mActiveMediaSessionContextId;
+}
+
+void MediaController::Activate() {
+ MOZ_ASSERT(!mShutdown);
+ RefPtr<MediaControlService> service = MediaControlService::GetService();
+ if (service && !mIsActive) {
+ LOG("Activate");
+ mIsActive = service->RegisterActiveMediaController(this);
+ MOZ_ASSERT(mIsActive, "Fail to register controller!");
+ DispatchAsyncEvent(u"activated"_ns);
+ }
+}
+
+void MediaController::Deactivate() {
+ MOZ_ASSERT(!mShutdown);
+ RefPtr<MediaControlService> service = MediaControlService::GetService();
+ if (service) {
+ service->GetAudioFocusManager().RevokeAudioFocus(this);
+ if (mIsActive) {
+ LOG("Deactivate");
+ mIsActive = !service->UnregisterActiveMediaController(this);
+ MOZ_ASSERT(!mIsActive, "Fail to unregister controller!");
+ DispatchAsyncEvent(u"deactivated"_ns);
+ }
+ }
+}
+
+void MediaController::SetIsInPictureInPictureMode(
+ uint64_t aBrowsingContextId, bool aIsInPictureInPictureMode) {
+ if (mIsInPictureInPictureMode == aIsInPictureInPictureMode) {
+ return;
+ }
+ LOG("Set IsInPictureInPictureMode to %s",
+ aIsInPictureInPictureMode ? "true" : "false");
+ mIsInPictureInPictureMode = aIsInPictureInPictureMode;
+ ForceToBecomeMainControllerIfNeeded();
+ UpdateDeactivationTimerIfNeeded();
+ mPictureInPictureModeChangedEvent.Notify(mIsInPictureInPictureMode);
+}
+
+void MediaController::NotifyMediaFullScreenState(uint64_t aBrowsingContextId,
+ bool aIsInFullScreen) {
+ if (mIsInFullScreenMode == aIsInFullScreen) {
+ return;
+ }
+ LOG("%s fullscreen", aIsInFullScreen ? "Entered" : "Left");
+ mIsInFullScreenMode = aIsInFullScreen;
+ ForceToBecomeMainControllerIfNeeded();
+ mFullScreenChangedEvent.Notify(mIsInFullScreenMode);
+}
+
+bool MediaController::IsMainController() const {
+ RefPtr<MediaControlService> service = MediaControlService::GetService();
+ return service ? service->GetMainController() == this : false;
+}
+
+bool MediaController::ShouldRequestForMainController() const {
+ // This controller is already the main controller.
+ if (IsMainController()) {
+ return false;
+ }
+ // We would only force controller to become main controller if it's in the
+ // PIP mode or fullscreen, otherwise it should follow the general rule.
+ // In addition, do nothing if the controller has been shutdowned.
+ return IsBeingUsedInPIPModeOrFullscreen() && !mShutdown;
+}
+
+void MediaController::ForceToBecomeMainControllerIfNeeded() {
+ if (!ShouldRequestForMainController()) {
+ return;
+ }
+ RefPtr<MediaControlService> service = MediaControlService::GetService();
+ MOZ_ASSERT(service, "service was shutdown before shutting down controller?");
+ // If the controller hasn't been activated and it's ready to be activated,
+ // then activating it should also make it become a main controller. If it's
+ // already activated but isn't a main controller yet, then explicitly request
+ // it.
+ if (!IsActive() && ShouldActivateController()) {
+ Activate();
+ } else if (IsActive()) {
+ service->RequestUpdateMainController(this);
+ }
+}
+
+void MediaController::HandleActualPlaybackStateChanged() {
+ // Media control service would like to know all controllers' playback state
+ // in order to decide which controller should be the main controller that is
+ // usually the last tab which plays media.
+ if (RefPtr<MediaControlService> service = MediaControlService::GetService()) {
+ service->NotifyControllerPlaybackStateChanged(this);
+ }
+ DispatchAsyncEvent(u"playbackstatechange"_ns);
+}
+
+void MediaController::UpdateActivatedStateIfNeeded() {
+ if (ShouldActivateController()) {
+ Activate();
+ } else if (ShouldDeactivateController()) {
+ Deactivate();
+ }
+}
+
+void MediaController::HandleSupportedMediaSessionActionsChanged(
+ const nsTArray<MediaSessionAction>& aSupportedAction) {
+ // Convert actions to keys, some of them have been included in the supported
+ // keys, such as "play", "pause" and "stop".
+ nsTArray<MediaControlKey> newSupportedKeys;
+ GetDefaultSupportedKeys(newSupportedKeys);
+ for (const auto& action : aSupportedAction) {
+ MediaControlKey key = ConvertMediaSessionActionToControlKey(action);
+ if (!newSupportedKeys.Contains(key)) {
+ newSupportedKeys.AppendElement(key);
+ }
+ }
+ // As the supported key event should only be notified when supported keys
+ // change, so abort following steps if they don't change.
+ if (newSupportedKeys == mSupportedKeys) {
+ return;
+ }
+ LOG("Supported keys changes");
+ mSupportedKeys = newSupportedKeys;
+ mSupportedKeysChangedEvent.Notify(mSupportedKeys);
+ RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
+ this, u"supportedkeyschange"_ns, CanBubble::eYes);
+ asyncDispatcher->PostDOMEvent();
+ MediaController_Binding::ClearCachedSupportedKeysValue(this);
+}
+
+void MediaController::HandlePositionStateChanged(const PositionState& aState) {
+ PositionStateEventInit init;
+ init.mDuration = aState.mDuration;
+ init.mPlaybackRate = aState.mPlaybackRate;
+ init.mPosition = aState.mLastReportedPlaybackPosition;
+ RefPtr<PositionStateEvent> event =
+ PositionStateEvent::Constructor(this, u"positionstatechange"_ns, init);
+ DispatchAsyncEvent(event);
+}
+
+void MediaController::HandleMetadataChanged(
+ const MediaMetadataBase& aMetadata) {
+ // The reason we don't append metadata with `metadatachange` event is that
+ // allocating artwork might fail if the memory is not enough, but for the
+ // event we are not able to throw an error. Therefore, we want to the listener
+ // to use `getMetadata()` to get metadata, because it would throw an error if
+ // we fail to allocate artwork.
+ DispatchAsyncEvent(u"metadatachange"_ns);
+ // If metadata change is because of resetting active media session, then we
+ // should check if controller needs to be deactivated.
+ if (ShouldDeactivateController()) {
+ Deactivate();
+ }
+}
+
+void MediaController::DispatchAsyncEvent(const nsAString& aName) {
+ RefPtr<Event> event = NS_NewDOMEvent(this, nullptr, nullptr);
+ event->InitEvent(aName, false, false);
+ event->SetTrusted(true);
+ DispatchAsyncEvent(event);
+}
+
+void MediaController::DispatchAsyncEvent(Event* aEvent) {
+ MOZ_ASSERT(aEvent);
+ nsAutoString eventType;
+ aEvent->GetType(eventType);
+ if (!mIsActive && !eventType.EqualsLiteral("deactivated")) {
+ LOG("Only 'deactivated' can be dispatched on a deactivated controller, not "
+ "'%s'",
+ NS_ConvertUTF16toUTF8(eventType).get());
+ return;
+ }
+ LOG("Dispatch event %s", NS_ConvertUTF16toUTF8(eventType).get());
+ RefPtr<AsyncEventDispatcher> asyncDispatcher =
+ new AsyncEventDispatcher(this, aEvent);
+ asyncDispatcher->PostDOMEvent();
+}
+
+CopyableTArray<MediaControlKey> MediaController::GetSupportedMediaKeys() const {
+ return mSupportedKeys;
+}
+
+void MediaController::Select() const {
+ if (RefPtr<BrowsingContext> bc = BrowsingContext::Get(Id())) {
+ bc->Canonical()->AddPageAwakeRequest();
+ }
+}
+
+void MediaController::Unselect() const {
+ if (RefPtr<BrowsingContext> bc = BrowsingContext::Get(Id())) {
+ bc->Canonical()->RemovePageAwakeRequest();
+ }
+}
+
+} // namespace mozilla::dom
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