diff options
Diffstat (limited to 'dom/html/HTMLVideoElement.cpp')
| -rw-r--r-- | dom/html/HTMLVideoElement.cpp | 681 |
1 files changed, 681 insertions, 0 deletions
diff --git a/dom/html/HTMLVideoElement.cpp b/dom/html/HTMLVideoElement.cpp new file mode 100644 index 0000000000..effb21706c --- /dev/null +++ b/dom/html/HTMLVideoElement.cpp @@ -0,0 +1,681 @@ +/* -*- 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 "mozilla/dom/HTMLVideoElement.h" + +#include "mozilla/AsyncEventDispatcher.h" +#include "mozilla/dom/HTMLVideoElementBinding.h" +#include "nsGenericHTMLElement.h" +#include "nsGkAtoms.h" +#include "nsSize.h" +#include "nsError.h" +#include "nsIHttpChannel.h" +#include "nsNodeInfoManager.h" +#include "plbase64.h" +#include "prlock.h" +#include "nsRFPService.h" +#include "nsThreadUtils.h" +#include "ImageContainer.h" +#include "VideoFrameContainer.h" +#include "VideoOutput.h" + +#include "FrameStatistics.h" +#include "MediaError.h" +#include "MediaDecoder.h" +#include "MediaDecoderStateMachine.h" +#include "mozilla/Preferences.h" +#include "mozilla/dom/WakeLock.h" +#include "mozilla/dom/power/PowerManagerService.h" +#include "mozilla/dom/Performance.h" +#include "mozilla/dom/TimeRanges.h" +#include "mozilla/dom/VideoPlaybackQuality.h" +#include "mozilla/dom/VideoStreamTrack.h" +#include "mozilla/StaticPrefs_media.h" +#include "mozilla/Unused.h" + +#include <algorithm> +#include <limits> + +extern mozilla::LazyLogModule gMediaElementLog; +#define LOG(msg, ...) \ + MOZ_LOG(gMediaElementLog, LogLevel::Debug, \ + ("HTMLVideoElement=%p, " msg, this, ##__VA_ARGS__)) + +nsGenericHTMLElement* NS_NewHTMLVideoElement( + already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo, + mozilla::dom::FromParser aFromParser) { + RefPtr<mozilla::dom::NodeInfo> nodeInfo(aNodeInfo); + auto* nim = nodeInfo->NodeInfoManager(); + mozilla::dom::HTMLVideoElement* element = + new (nim) mozilla::dom::HTMLVideoElement(nodeInfo.forget()); + element->Init(); + return element; +} + +namespace mozilla::dom { + +nsresult HTMLVideoElement::Clone(mozilla::dom::NodeInfo* aNodeInfo, + nsINode** aResult) const { + *aResult = nullptr; + RefPtr<mozilla::dom::NodeInfo> ni(aNodeInfo); + auto* nim = ni->NodeInfoManager(); + HTMLVideoElement* it = new (nim) HTMLVideoElement(ni.forget()); + it->Init(); + nsCOMPtr<nsINode> kungFuDeathGrip = it; + nsresult rv = const_cast<HTMLVideoElement*>(this)->CopyInnerTo(it); + if (NS_SUCCEEDED(rv)) { + kungFuDeathGrip.swap(*aResult); + } + return rv; +} + +NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(HTMLVideoElement, + HTMLMediaElement) + +NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLVideoElement) + +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(HTMLVideoElement) + NS_IMPL_CYCLE_COLLECTION_UNLINK(mVisualCloneTarget) + NS_IMPL_CYCLE_COLLECTION_UNLINK(mVisualCloneTargetPromise) + NS_IMPL_CYCLE_COLLECTION_UNLINK(mVisualCloneSource) + tmp->mSecondaryVideoOutput = nullptr; +NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(HTMLMediaElement) + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLVideoElement, + HTMLMediaElement) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mVisualCloneTarget) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mVisualCloneTargetPromise) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mVisualCloneSource) +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +HTMLVideoElement::HTMLVideoElement(already_AddRefed<NodeInfo>&& aNodeInfo) + : HTMLMediaElement(std::move(aNodeInfo)), + mVideoWatchManager(this, AbstractThread::MainThread()) { + DecoderDoctorLogger::LogConstruction(this); +} + +HTMLVideoElement::~HTMLVideoElement() { + mVideoWatchManager.Shutdown(); + DecoderDoctorLogger::LogDestruction(this); +} + +void HTMLVideoElement::UpdateMediaSize(const nsIntSize& aSize) { + HTMLMediaElement::UpdateMediaSize(aSize); + // If we have a clone target, we should update its size as well. + if (mVisualCloneTarget) { + Maybe<nsIntSize> newSize = Some(aSize); + mVisualCloneTarget->Invalidate(ImageSizeChanged::Yes, newSize, + ForceInvalidate::Yes); + } +} + +Maybe<CSSIntSize> HTMLVideoElement::GetVideoSize() const { + if (!mMediaInfo.HasVideo()) { + return Nothing(); + } + + if (mDisableVideo) { + return Nothing(); + } + + CSSIntSize size; + switch (mMediaInfo.mVideo.mRotation) { + case VideoRotation::kDegree_90: + case VideoRotation::kDegree_270: { + size.width = mMediaInfo.mVideo.mDisplay.height; + size.height = mMediaInfo.mVideo.mDisplay.width; + break; + } + case VideoRotation::kDegree_0: + case VideoRotation::kDegree_180: + default: { + size.height = mMediaInfo.mVideo.mDisplay.height; + size.width = mMediaInfo.mVideo.mDisplay.width; + break; + } + } + return Some(size); +} + +void HTMLVideoElement::Invalidate(ImageSizeChanged aImageSizeChanged, + const Maybe<nsIntSize>& aNewIntrinsicSize, + ForceInvalidate aForceInvalidate) { + HTMLMediaElement::Invalidate(aImageSizeChanged, aNewIntrinsicSize, + aForceInvalidate); + if (mVisualCloneTarget) { + VideoFrameContainer* container = + mVisualCloneTarget->GetVideoFrameContainer(); + if (container) { + container->Invalidate(); + } + } +} + +bool HTMLVideoElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute, + const nsAString& aValue, + nsIPrincipal* aMaybeScriptedPrincipal, + nsAttrValue& aResult) { + if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height) { + return aResult.ParseHTMLDimension(aValue); + } + + return HTMLMediaElement::ParseAttribute(aNamespaceID, aAttribute, aValue, + aMaybeScriptedPrincipal, aResult); +} + +void HTMLVideoElement::MapAttributesIntoRule( + MappedDeclarationsBuilder& aBuilder) { + MapImageSizeAttributesInto(aBuilder, MapAspectRatio::Yes); + MapCommonAttributesInto(aBuilder); +} + +NS_IMETHODIMP_(bool) +HTMLVideoElement::IsAttributeMapped(const nsAtom* aAttribute) const { + static const MappedAttributeEntry attributes[] = { + {nsGkAtoms::width}, {nsGkAtoms::height}, {nullptr}}; + + static const MappedAttributeEntry* const map[] = {attributes, + sCommonAttributeMap}; + + return FindAttributeDependence(aAttribute, map); +} + +nsMapRuleToAttributesFunc HTMLVideoElement::GetAttributeMappingFunction() + const { + return &MapAttributesIntoRule; +} + +void HTMLVideoElement::UnbindFromTree(bool aNullParent) { + if (mVisualCloneSource) { + mVisualCloneSource->EndCloningVisually(); + } else if (mVisualCloneTarget) { + AsyncEventDispatcher::RunDOMEventWhenSafe( + *this, u"MozStopPictureInPicture"_ns, CanBubble::eNo, + ChromeOnlyDispatch::eYes); + EndCloningVisually(); + } + + HTMLMediaElement::UnbindFromTree(aNullParent); +} + +nsresult HTMLVideoElement::SetAcceptHeader(nsIHttpChannel* aChannel) { + nsAutoCString value( + "video/webm," + "video/ogg," + "video/*;q=0.9," + "application/ogg;q=0.7," + "audio/*;q=0.6,*/*;q=0.5"); + + return aChannel->SetRequestHeader("Accept"_ns, value, false); +} + +bool HTMLVideoElement::IsInteractiveHTMLContent() const { + return HasAttr(nsGkAtoms::controls) || + HTMLMediaElement::IsInteractiveHTMLContent(); +} + +gfx::IntSize HTMLVideoElement::GetVideoIntrinsicDimensions() { + const auto& sz = mMediaInfo.mVideo.mDisplay; + + // Prefer the size of the container as it's more up to date. + return ToMaybeRef(mVideoFrameContainer.get()) + .map([&](auto& aVFC) { return aVFC.CurrentIntrinsicSize().valueOr(sz); }) + .valueOr(sz); +} + +uint32_t HTMLVideoElement::VideoWidth() { + if (!HasVideo()) { + return 0; + } + gfx::IntSize size = GetVideoIntrinsicDimensions(); + if (mMediaInfo.mVideo.mRotation == VideoRotation::kDegree_90 || + mMediaInfo.mVideo.mRotation == VideoRotation::kDegree_270) { + return size.height; + } + return size.width; +} + +uint32_t HTMLVideoElement::VideoHeight() { + if (!HasVideo()) { + return 0; + } + gfx::IntSize size = GetVideoIntrinsicDimensions(); + if (mMediaInfo.mVideo.mRotation == VideoRotation::kDegree_90 || + mMediaInfo.mVideo.mRotation == VideoRotation::kDegree_270) { + return size.width; + } + return size.height; +} + +uint32_t HTMLVideoElement::MozParsedFrames() const { + MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread."); + if (!IsVideoStatsEnabled()) { + return 0; + } + + if (OwnerDoc()->ShouldResistFingerprinting( + RFPTarget::VideoElementMozFrames)) { + return nsRFPService::GetSpoofedTotalFrames(TotalPlayTime()); + } + + return mDecoder ? mDecoder->GetFrameStatistics().GetParsedFrames() : 0; +} + +uint32_t HTMLVideoElement::MozDecodedFrames() const { + MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread."); + if (!IsVideoStatsEnabled()) { + return 0; + } + + if (OwnerDoc()->ShouldResistFingerprinting( + RFPTarget::VideoElementMozFrames)) { + return nsRFPService::GetSpoofedTotalFrames(TotalPlayTime()); + } + + return mDecoder ? mDecoder->GetFrameStatistics().GetDecodedFrames() : 0; +} + +uint32_t HTMLVideoElement::MozPresentedFrames() { + MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread."); + if (!IsVideoStatsEnabled()) { + return 0; + } + + if (OwnerDoc()->ShouldResistFingerprinting( + RFPTarget::VideoElementMozFrames)) { + return nsRFPService::GetSpoofedPresentedFrames(TotalPlayTime(), + VideoWidth(), VideoHeight()); + } + + return mDecoder ? mDecoder->GetFrameStatistics().GetPresentedFrames() : 0; +} + +uint32_t HTMLVideoElement::MozPaintedFrames() { + MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread."); + if (!IsVideoStatsEnabled()) { + return 0; + } + + if (OwnerDoc()->ShouldResistFingerprinting( + RFPTarget::VideoElementMozFrames)) { + return nsRFPService::GetSpoofedPresentedFrames(TotalPlayTime(), + VideoWidth(), VideoHeight()); + } + + layers::ImageContainer* container = GetImageContainer(); + return container ? container->GetPaintCount() : 0; +} + +double HTMLVideoElement::MozFrameDelay() { + MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread."); + + if (!IsVideoStatsEnabled() || OwnerDoc()->ShouldResistFingerprinting( + RFPTarget::VideoElementMozFrameDelay)) { + return 0.0; + } + + VideoFrameContainer* container = GetVideoFrameContainer(); + // Hide negative delays. Frame timing tweaks in the compositor (e.g. + // adding a bias value to prevent multiple dropped/duped frames when + // frame times are aligned with composition times) may produce apparent + // negative delay, but we shouldn't report that. + return container ? std::max(0.0, container->GetFrameDelay()) : 0.0; +} + +bool HTMLVideoElement::MozHasAudio() const { + MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread."); + return HasAudio(); +} + +JSObject* HTMLVideoElement::WrapNode(JSContext* aCx, + JS::Handle<JSObject*> aGivenProto) { + return HTMLVideoElement_Binding::Wrap(aCx, this, aGivenProto); +} + +already_AddRefed<VideoPlaybackQuality> +HTMLVideoElement::GetVideoPlaybackQuality() { + DOMHighResTimeStamp creationTime = 0; + uint32_t totalFrames = 0; + uint32_t droppedFrames = 0; + + if (IsVideoStatsEnabled()) { + if (nsPIDOMWindowInner* window = OwnerDoc()->GetInnerWindow()) { + Performance* perf = window->GetPerformance(); + if (perf) { + creationTime = perf->Now(); + } + } + + if (mDecoder) { + if (OwnerDoc()->ShouldResistFingerprinting( + RFPTarget::VideoElementPlaybackQuality)) { + totalFrames = nsRFPService::GetSpoofedTotalFrames(TotalPlayTime()); + droppedFrames = nsRFPService::GetSpoofedDroppedFrames( + TotalPlayTime(), VideoWidth(), VideoHeight()); + } else { + FrameStatistics* stats = &mDecoder->GetFrameStatistics(); + if (sizeof(totalFrames) >= sizeof(stats->GetParsedFrames())) { + totalFrames = stats->GetTotalFrames(); + droppedFrames = stats->GetDroppedFrames(); + } else { + uint64_t total = stats->GetTotalFrames(); + const auto maxNumber = std::numeric_limits<uint32_t>::max(); + if (total <= maxNumber) { + totalFrames = uint32_t(total); + droppedFrames = uint32_t(stats->GetDroppedFrames()); + } else { + // Too big number(s) -> Resize everything to fit in 32 bits. + double ratio = double(maxNumber) / double(total); + totalFrames = maxNumber; // === total * ratio + droppedFrames = uint32_t(double(stats->GetDroppedFrames()) * ratio); + } + } + } + if (!StaticPrefs::media_video_dropped_frame_stats_enabled()) { + droppedFrames = 0; + } + } + } + + RefPtr<VideoPlaybackQuality> playbackQuality = + new VideoPlaybackQuality(this, creationTime, totalFrames, droppedFrames); + return playbackQuality.forget(); +} + +void HTMLVideoElement::WakeLockRelease() { + HTMLMediaElement::WakeLockRelease(); + ReleaseVideoWakeLockIfExists(); +} + +void HTMLVideoElement::UpdateWakeLock() { + HTMLMediaElement::UpdateWakeLock(); + if (!mPaused) { + CreateVideoWakeLockIfNeeded(); + } else { + ReleaseVideoWakeLockIfExists(); + } +} + +bool HTMLVideoElement::ShouldCreateVideoWakeLock() const { + if (!StaticPrefs::media_video_wakelock()) { + return false; + } + // Only request wake lock for video with audio or video from media + // stream, because non-stream video without audio is often used as a + // background image. + // + // Some web conferencing sites route audio outside the video element, + // and would not be detected unless we check for media stream, so do + // that below. + // + // Media streams generally aren't used as background images, though if + // they were we'd get false positives. If this is an issue, we could + // check for media stream AND document has audio playing (but that was + // tricky to do). + return HasVideo() && (mSrcStream || HasAudio()); +} + +void HTMLVideoElement::CreateVideoWakeLockIfNeeded() { + if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) { + return; + } + if (!mScreenWakeLock && ShouldCreateVideoWakeLock()) { + RefPtr<power::PowerManagerService> pmService = + power::PowerManagerService::GetInstance(); + NS_ENSURE_TRUE_VOID(pmService); + + ErrorResult rv; + mScreenWakeLock = pmService->NewWakeLock(u"video-playing"_ns, + OwnerDoc()->GetInnerWindow(), rv); + } +} + +void HTMLVideoElement::ReleaseVideoWakeLockIfExists() { + if (mScreenWakeLock) { + ErrorResult rv; + mScreenWakeLock->Unlock(rv); + rv.SuppressException(); + mScreenWakeLock = nullptr; + return; + } +} + +bool HTMLVideoElement::SetVisualCloneTarget( + RefPtr<HTMLVideoElement> aVisualCloneTarget, + RefPtr<Promise> aVisualCloneTargetPromise) { + MOZ_DIAGNOSTIC_ASSERT( + !aVisualCloneTarget || aVisualCloneTarget->IsInComposedDoc(), + "Can't set the clone target to a disconnected video " + "element."); + MOZ_DIAGNOSTIC_ASSERT(!mVisualCloneSource, + "Can't clone a video element that is already a clone."); + if (!aVisualCloneTarget || + (aVisualCloneTarget->IsInComposedDoc() && !mVisualCloneSource)) { + mVisualCloneTarget = std::move(aVisualCloneTarget); + mVisualCloneTargetPromise = std::move(aVisualCloneTargetPromise); + return true; + } + return false; +} + +bool HTMLVideoElement::SetVisualCloneSource( + RefPtr<HTMLVideoElement> aVisualCloneSource) { + MOZ_DIAGNOSTIC_ASSERT( + !aVisualCloneSource || aVisualCloneSource->IsInComposedDoc(), + "Can't set the clone source to a disconnected video " + "element."); + MOZ_DIAGNOSTIC_ASSERT(!mVisualCloneTarget, + "Can't clone a video element that is already a " + "clone."); + if (!aVisualCloneSource || + (aVisualCloneSource->IsInComposedDoc() && !mVisualCloneTarget)) { + mVisualCloneSource = std::move(aVisualCloneSource); + return true; + } + return false; +} + +/* static */ +bool HTMLVideoElement::IsVideoStatsEnabled() { + return StaticPrefs::media_video_stats_enabled(); +} + +double HTMLVideoElement::TotalPlayTime() const { + double total = 0.0; + + if (mPlayed) { + uint32_t timeRangeCount = mPlayed->Length(); + + for (uint32_t i = 0; i < timeRangeCount; i++) { + double begin = mPlayed->Start(i); + double end = mPlayed->End(i); + total += end - begin; + } + + if (mCurrentPlayRangeStart != -1.0) { + double now = CurrentTime(); + if (mCurrentPlayRangeStart != now) { + total += now - mCurrentPlayRangeStart; + } + } + } + + return total; +} + +already_AddRefed<Promise> HTMLVideoElement::CloneElementVisually( + HTMLVideoElement& aTargetVideo, ErrorResult& aRv) { + MOZ_ASSERT(IsInComposedDoc(), + "Can't clone a video that's not bound to a DOM tree."); + MOZ_ASSERT(aTargetVideo.IsInComposedDoc(), + "Can't clone to a video that's not bound to a DOM tree."); + if (!IsInComposedDoc() || !aTargetVideo.IsInComposedDoc()) { + aRv.Throw(NS_ERROR_UNEXPECTED); + return nullptr; + } + + nsPIDOMWindowInner* win = OwnerDoc()->GetInnerWindow(); + if (!win) { + aRv.Throw(NS_ERROR_UNEXPECTED); + return nullptr; + } + + RefPtr<Promise> promise = Promise::Create(win->AsGlobal(), aRv); + if (aRv.Failed()) { + return nullptr; + } + + // Do we already have a visual clone target? If so, shut it down. + if (mVisualCloneTarget) { + EndCloningVisually(); + } + + // If there's a poster set on the target video, clear it, otherwise + // it'll display over top of the cloned frames. + aTargetVideo.UnsetHTMLAttr(nsGkAtoms::poster, aRv); + if (aRv.Failed()) { + return nullptr; + } + + if (!SetVisualCloneTarget(&aTargetVideo, promise)) { + aRv.Throw(NS_ERROR_FAILURE); + return nullptr; + } + + if (!aTargetVideo.SetVisualCloneSource(this)) { + mVisualCloneTarget = nullptr; + aRv.Throw(NS_ERROR_FAILURE); + return nullptr; + } + + aTargetVideo.SetMediaInfo(mMediaInfo); + + if (IsInComposedDoc() && !StaticPrefs::media_cloneElementVisually_testing()) { + NotifyUAWidgetSetupOrChange(); + } + + MaybeBeginCloningVisually(); + + return promise.forget(); +} + +void HTMLVideoElement::StopCloningElementVisually() { + if (mVisualCloneTarget) { + EndCloningVisually(); + } +} + +void HTMLVideoElement::MaybeBeginCloningVisually() { + if (!mVisualCloneTarget) { + return; + } + + if (mDecoder) { + mDecoder->SetSecondaryVideoContainer( + mVisualCloneTarget->GetVideoFrameContainer()); + NotifyDecoderActivityChanges(); + UpdateMediaControlAfterPictureInPictureModeChanged(); + } else if (mSrcStream) { + VideoFrameContainer* container = + mVisualCloneTarget->GetVideoFrameContainer(); + if (container) { + mSecondaryVideoOutput = MakeRefPtr<FirstFrameVideoOutput>( + container, AbstractThread::MainThread()); + mVideoWatchManager.Watch( + mSecondaryVideoOutput->mFirstFrameRendered, + &HTMLVideoElement::OnSecondaryVideoOutputFirstFrameRendered); + SetSecondaryMediaStreamRenderer(container, mSecondaryVideoOutput); + } + UpdateMediaControlAfterPictureInPictureModeChanged(); + } +} + +void HTMLVideoElement::EndCloningVisually() { + MOZ_ASSERT(mVisualCloneTarget); + + if (mDecoder) { + mDecoder->SetSecondaryVideoContainer(nullptr); + NotifyDecoderActivityChanges(); + } else if (mSrcStream) { + if (mSecondaryVideoOutput) { + mVideoWatchManager.Unwatch( + mSecondaryVideoOutput->mFirstFrameRendered, + &HTMLVideoElement::OnSecondaryVideoOutputFirstFrameRendered); + mSecondaryVideoOutput = nullptr; + } + SetSecondaryMediaStreamRenderer(nullptr); + } + + Unused << mVisualCloneTarget->SetVisualCloneSource(nullptr); + Unused << SetVisualCloneTarget(nullptr); + + UpdateMediaControlAfterPictureInPictureModeChanged(); + + if (IsInComposedDoc() && !StaticPrefs::media_cloneElementVisually_testing()) { + NotifyUAWidgetSetupOrChange(); + } +} + +void HTMLVideoElement::OnSecondaryVideoContainerInstalled( + const RefPtr<VideoFrameContainer>& aSecondaryContainer) { + MOZ_ASSERT(NS_IsMainThread()); + MOZ_DIAGNOSTIC_ASSERT_IF(mVisualCloneTargetPromise, mVisualCloneTarget); + if (!mVisualCloneTargetPromise) { + // Clone target was unset. + return; + } + + VideoFrameContainer* container = mVisualCloneTarget->GetVideoFrameContainer(); + if (NS_WARN_IF(container != aSecondaryContainer)) { + // Not the right container. + return; + } + + NS_DispatchToCurrentThread(NewRunnableMethod( + "Promise::MaybeResolveWithUndefined", mVisualCloneTargetPromise, + &Promise::MaybeResolveWithUndefined)); + mVisualCloneTargetPromise = nullptr; +} + +void HTMLVideoElement::OnSecondaryVideoOutputFirstFrameRendered() { + OnSecondaryVideoContainerInstalled( + mVisualCloneTarget->GetVideoFrameContainer()); +} + +void HTMLVideoElement::OnVisibilityChange(Visibility aNewVisibility) { + HTMLMediaElement::OnVisibilityChange(aNewVisibility); + + // See the alternative part after step 4, but we only pause/resume invisible + // autoplay for non-audible video, which is different from the spec. This + // behavior seems aiming to reduce the power consumption without interering + // users, and Chrome and Safari also chose to do that only for non-audible + // video, so we want to match them in order to reduce webcompat issue. + // https://html.spec.whatwg.org/multipage/media.html#ready-states:eligible-for-autoplay-2 + if (!HasAttr(nsGkAtoms::autoplay) || IsAudible()) { + return; + } + + if (aNewVisibility == Visibility::ApproximatelyVisible && mPaused && + IsEligibleForAutoplay() && AllowedToPlay()) { + LOG("resume invisible paused autoplay video"); + RunAutoplay(); + } + + // We need to consider the Pip window as well, which won't reflect in the + // visibility event. + if ((aNewVisibility == Visibility::ApproximatelyNonVisible && + !IsCloningElementVisually()) && + mCanAutoplayFlag) { + LOG("pause non-audible autoplay video when it's invisible"); + PauseInternal(); + mCanAutoplayFlag = true; + return; + } +} + +} // namespace mozilla::dom + +#undef LOG |