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gecko-dev/dom/html/TextTrackManager.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 "mozilla/dom/TextTrackManager.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/Maybe.h"
#include "mozilla/Telemetry.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "mozilla/dom/HTMLTrackElement.h"
#include "mozilla/dom/HTMLVideoElement.h"
#include "mozilla/dom/TextTrack.h"
#include "mozilla/dom/TextTrackCue.h"
#include "nsComponentManagerUtils.h"
#include "nsGlobalWindow.h"
#include "nsIFrame.h"
#include "nsIWebVTTParserWrapper.h"
#include "nsVariant.h"
#include "nsVideoFrame.h"
mozilla::LazyLogModule gTextTrackLog("WebVTT");
#define WEBVTT_LOG(msg, ...) \
MOZ_LOG(gTextTrackLog, LogLevel::Debug, \
("TextTrackManager=%p, " msg, this, ##__VA_ARGS__))
#define WEBVTT_LOGV(msg, ...) \
MOZ_LOG(gTextTrackLog, LogLevel::Verbose, \
("TextTrackManager=%p, " msg, this, ##__VA_ARGS__))
namespace mozilla::dom {
NS_IMPL_ISUPPORTS(TextTrackManager::ShutdownObserverProxy, nsIObserver);
void TextTrackManager::ShutdownObserverProxy::Unregister() {
nsContentUtils::UnregisterShutdownObserver(this);
mManager = nullptr;
}
CompareTextTracks::CompareTextTracks(HTMLMediaElement* aMediaElement) {
mMediaElement = aMediaElement;
}
Maybe<uint32_t> CompareTextTracks::TrackChildPosition(
TextTrack* aTextTrack) const {
MOZ_DIAGNOSTIC_ASSERT(aTextTrack);
HTMLTrackElement* trackElement = aTextTrack->GetTrackElement();
if (!trackElement) {
return Nothing();
}
return mMediaElement->ComputeIndexOf(trackElement);
}
bool CompareTextTracks::Equals(TextTrack* aOne, TextTrack* aTwo) const {
// Two tracks can never be equal. If they have corresponding TrackElements
// they would need to occupy the same tree position (impossible) and in the
// case of tracks coming from AddTextTrack source we put the newest at the
// last position, so they won't be equal as well.
return false;
}
bool CompareTextTracks::LessThan(TextTrack* aOne, TextTrack* aTwo) const {
// Protect against nullptr TextTrack objects; treat them as
// sorting toward the end.
if (!aOne) {
return false;
}
if (!aTwo) {
return true;
}
TextTrackSource sourceOne = aOne->GetTextTrackSource();
TextTrackSource sourceTwo = aTwo->GetTextTrackSource();
if (sourceOne != sourceTwo) {
return sourceOne == TextTrackSource::Track ||
(sourceOne == TextTrackSource::AddTextTrack &&
sourceTwo == TextTrackSource::MediaResourceSpecific);
}
switch (sourceOne) {
case TextTrackSource::Track: {
Maybe<uint32_t> positionOne = TrackChildPosition(aOne);
Maybe<uint32_t> positionTwo = TrackChildPosition(aTwo);
// If either position one or positiontwo are Nothing then something has
// gone wrong. In this case we should just put them at the back of the
// list.
return positionOne.isSome() && positionTwo.isSome() &&
*positionOne < *positionTwo;
}
case TextTrackSource::AddTextTrack:
// For AddTextTrack sources the tracks will already be in the correct
// relative order in the source array. Assume we're called in iteration
// order and can therefore always report aOne < aTwo to maintain the
// original temporal ordering.
return true;
case TextTrackSource::MediaResourceSpecific:
// No rules for Media Resource Specific tracks yet.
break;
}
return true;
}
NS_IMPL_CYCLE_COLLECTION(TextTrackManager, mMediaElement, mTextTracks,
mPendingTextTracks, mNewCues)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TextTrackManager)
NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(TextTrackManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(TextTrackManager)
StaticRefPtr<nsIWebVTTParserWrapper> TextTrackManager::sParserWrapper;
TextTrackManager::TextTrackManager(HTMLMediaElement* aMediaElement)
: mMediaElement(aMediaElement),
mHasSeeked(false),
mLastTimeMarchesOnCalled(media::TimeUnit::Zero()),
mTimeMarchesOnDispatched(false),
mUpdateCueDisplayDispatched(false),
performedTrackSelection(false),
mShutdown(false) {
nsISupports* parentObject = mMediaElement->OwnerDoc()->GetParentObject();
NS_ENSURE_TRUE_VOID(parentObject);
WEBVTT_LOG("Create TextTrackManager");
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(parentObject);
mNewCues = new TextTrackCueList(window);
mTextTracks = new TextTrackList(window, this);
mPendingTextTracks = new TextTrackList(window, this);
if (!sParserWrapper) {
nsCOMPtr<nsIWebVTTParserWrapper> parserWrapper =
do_CreateInstance(NS_WEBVTTPARSERWRAPPER_CONTRACTID);
MOZ_ASSERT(parserWrapper, "Can't create nsIWebVTTParserWrapper");
sParserWrapper = parserWrapper;
ClearOnShutdown(&sParserWrapper);
}
mShutdownProxy = new ShutdownObserverProxy(this);
}
TextTrackManager::~TextTrackManager() {
WEBVTT_LOG("~TextTrackManager");
mShutdownProxy->Unregister();
}
TextTrackList* TextTrackManager::GetTextTracks() const { return mTextTracks; }
already_AddRefed<TextTrack> TextTrackManager::AddTextTrack(
TextTrackKind aKind, const nsAString& aLabel, const nsAString& aLanguage,
TextTrackMode aMode, TextTrackReadyState aReadyState,
TextTrackSource aTextTrackSource) {
if (!mMediaElement || !mTextTracks) {
return nullptr;
}
RefPtr<TextTrack> track = mTextTracks->AddTextTrack(
aKind, aLabel, aLanguage, aMode, aReadyState, aTextTrackSource,
CompareTextTracks(mMediaElement));
WEBVTT_LOG("AddTextTrack %p kind %" PRIu32 " Label %s Language %s",
track.get(), static_cast<uint32_t>(aKind),
NS_ConvertUTF16toUTF8(aLabel).get(),
NS_ConvertUTF16toUTF8(aLanguage).get());
AddCues(track);
ReportTelemetryForTrack(track);
if (aTextTrackSource == TextTrackSource::Track) {
RefPtr<nsIRunnable> task = NewRunnableMethod(
"dom::TextTrackManager::HonorUserPreferencesForTrackSelection", this,
&TextTrackManager::HonorUserPreferencesForTrackSelection);
NS_DispatchToMainThread(task.forget());
}
return track.forget();
}
void TextTrackManager::AddTextTrack(TextTrack* aTextTrack) {
if (!mMediaElement || !mTextTracks) {
return;
}
WEBVTT_LOG("AddTextTrack TextTrack %p", aTextTrack);
mTextTracks->AddTextTrack(aTextTrack, CompareTextTracks(mMediaElement));
AddCues(aTextTrack);
ReportTelemetryForTrack(aTextTrack);
if (aTextTrack->GetTextTrackSource() == TextTrackSource::Track) {
RefPtr<nsIRunnable> task = NewRunnableMethod(
"dom::TextTrackManager::HonorUserPreferencesForTrackSelection", this,
&TextTrackManager::HonorUserPreferencesForTrackSelection);
NS_DispatchToMainThread(task.forget());
}
}
void TextTrackManager::AddCues(TextTrack* aTextTrack) {
if (!mNewCues) {
WEBVTT_LOG("AddCues mNewCues is null");
return;
}
TextTrackCueList* cueList = aTextTrack->GetCues();
if (cueList) {
bool dummy;
WEBVTT_LOGV("AddCues, CuesNum=%d", cueList->Length());
for (uint32_t i = 0; i < cueList->Length(); ++i) {
mNewCues->AddCue(*cueList->IndexedGetter(i, dummy));
}
MaybeRunTimeMarchesOn();
}
}
void TextTrackManager::RemoveTextTrack(TextTrack* aTextTrack,
bool aPendingListOnly) {
if (!mPendingTextTracks || !mTextTracks) {
return;
}
WEBVTT_LOG("RemoveTextTrack TextTrack %p", aTextTrack);
mPendingTextTracks->RemoveTextTrack(aTextTrack);
if (aPendingListOnly) {
return;
}
mTextTracks->RemoveTextTrack(aTextTrack);
// Remove the cues in mNewCues belong to aTextTrack.
TextTrackCueList* removeCueList = aTextTrack->GetCues();
if (removeCueList) {
WEBVTT_LOGV("RemoveTextTrack removeCuesNum=%d", removeCueList->Length());
for (uint32_t i = 0; i < removeCueList->Length(); ++i) {
mNewCues->RemoveCue(*((*removeCueList)[i]));
}
MaybeRunTimeMarchesOn();
}
}
void TextTrackManager::DidSeek() {
WEBVTT_LOG("DidSeek");
mHasSeeked = true;
}
void TextTrackManager::UpdateCueDisplay() {
WEBVTT_LOG("UpdateCueDisplay");
mUpdateCueDisplayDispatched = false;
if (!mMediaElement || !mTextTracks || IsShutdown()) {
WEBVTT_LOG("Abort UpdateCueDisplay.");
return;
}
nsIFrame* frame = mMediaElement->GetPrimaryFrame();
nsVideoFrame* videoFrame = do_QueryFrame(frame);
if (!videoFrame) {
WEBVTT_LOG("Abort UpdateCueDisplay, because of no video frame.");
return;
}
nsCOMPtr<nsIContent> overlay = videoFrame->GetCaptionOverlay();
if (!overlay) {
WEBVTT_LOG("Abort UpdateCueDisplay, because of no overlay.");
return;
}
nsPIDOMWindowInner* window = mMediaElement->OwnerDoc()->GetInnerWindow();
if (!window) {
WEBVTT_LOG("Abort UpdateCueDisplay, because of no window.");
}
nsTArray<RefPtr<TextTrackCue>> showingCues;
mTextTracks->GetShowingCues(showingCues);
WEBVTT_LOG("UpdateCueDisplay, processCues, showingCuesNum=%zu",
showingCues.Length());
RefPtr<nsVariantCC> jsCues = new nsVariantCC();
jsCues->SetAsArray(nsIDataType::VTYPE_INTERFACE, &NS_GET_IID(EventTarget),
showingCues.Length(),
static_cast<void*>(showingCues.Elements()));
nsCOMPtr<nsIContent> controls = videoFrame->GetVideoControls();
sParserWrapper->ProcessCues(window, jsCues, overlay, controls);
}
void TextTrackManager::NotifyCueAdded(TextTrackCue& aCue) {
WEBVTT_LOG("NotifyCueAdded, cue=%p", &aCue);
if (mNewCues) {
mNewCues->AddCue(aCue);
}
MaybeRunTimeMarchesOn();
}
void TextTrackManager::NotifyCueRemoved(TextTrackCue& aCue) {
WEBVTT_LOG("NotifyCueRemoved, cue=%p", &aCue);
if (mNewCues) {
mNewCues->RemoveCue(aCue);
}
MaybeRunTimeMarchesOn();
DispatchUpdateCueDisplay();
}
void TextTrackManager::PopulatePendingList() {
if (!mTextTracks || !mPendingTextTracks || !mMediaElement) {
return;
}
uint32_t len = mTextTracks->Length();
bool dummy;
for (uint32_t index = 0; index < len; ++index) {
TextTrack* ttrack = mTextTracks->IndexedGetter(index, dummy);
if (ttrack && ttrack->Mode() != TextTrackMode::Disabled &&
ttrack->ReadyState() == TextTrackReadyState::Loading) {
mPendingTextTracks->AddTextTrack(ttrack,
CompareTextTracks(mMediaElement));
}
}
}
void TextTrackManager::AddListeners() {
if (mMediaElement) {
mMediaElement->AddEventListener(u"resizecaption"_ns, this, false, false);
mMediaElement->AddEventListener(u"resizevideocontrols"_ns, this, false,
false);
mMediaElement->AddEventListener(u"seeked"_ns, this, false, false);
mMediaElement->AddEventListener(u"controlbarchange"_ns, this, false, true);
}
}
void TextTrackManager::HonorUserPreferencesForTrackSelection() {
if (performedTrackSelection || !mTextTracks) {
return;
}
WEBVTT_LOG("HonorUserPreferencesForTrackSelection");
TextTrackKind ttKinds[] = {TextTrackKind::Captions, TextTrackKind::Subtitles};
// Steps 1 - 3: Perform automatic track selection for different TextTrack
// Kinds.
PerformTrackSelection(ttKinds, ArrayLength(ttKinds));
PerformTrackSelection(TextTrackKind::Descriptions);
PerformTrackSelection(TextTrackKind::Chapters);
// Step 4: Set all TextTracks with a kind of metadata that are disabled
// to hidden.
for (uint32_t i = 0; i < mTextTracks->Length(); i++) {
TextTrack* track = (*mTextTracks)[i];
if (track->Kind() == TextTrackKind::Metadata && TrackIsDefault(track) &&
track->Mode() == TextTrackMode::Disabled) {
track->SetMode(TextTrackMode::Hidden);
}
}
performedTrackSelection = true;
}
bool TextTrackManager::TrackIsDefault(TextTrack* aTextTrack) {
HTMLTrackElement* trackElement = aTextTrack->GetTrackElement();
if (!trackElement) {
return false;
}
return trackElement->Default();
}
void TextTrackManager::PerformTrackSelection(TextTrackKind aTextTrackKind) {
TextTrackKind ttKinds[] = {aTextTrackKind};
PerformTrackSelection(ttKinds, ArrayLength(ttKinds));
}
void TextTrackManager::PerformTrackSelection(TextTrackKind aTextTrackKinds[],
uint32_t size) {
nsTArray<TextTrack*> candidates;
GetTextTracksOfKinds(aTextTrackKinds, size, candidates);
// Step 3: If any TextTracks in candidates are showing then abort these steps.
for (uint32_t i = 0; i < candidates.Length(); i++) {
if (candidates[i]->Mode() == TextTrackMode::Showing) {
WEBVTT_LOGV("PerformTrackSelection Showing return kind %d",
static_cast<int>(candidates[i]->Kind()));
return;
}
}
// Step 4: Honor user preferences for track selection, otherwise, set the
// first TextTrack in candidates with a default attribute to showing.
// TODO: Bug 981691 - Honor user preferences for text track selection.
for (uint32_t i = 0; i < candidates.Length(); i++) {
if (TrackIsDefault(candidates[i]) &&
candidates[i]->Mode() == TextTrackMode::Disabled) {
candidates[i]->SetMode(TextTrackMode::Showing);
WEBVTT_LOGV("PerformTrackSelection set Showing kind %d",
static_cast<int>(candidates[i]->Kind()));
return;
}
}
}
void TextTrackManager::GetTextTracksOfKinds(TextTrackKind aTextTrackKinds[],
uint32_t size,
nsTArray<TextTrack*>& aTextTracks) {
for (uint32_t i = 0; i < size; i++) {
GetTextTracksOfKind(aTextTrackKinds[i], aTextTracks);
}
}
void TextTrackManager::GetTextTracksOfKind(TextTrackKind aTextTrackKind,
nsTArray<TextTrack*>& aTextTracks) {
if (!mTextTracks) {
return;
}
for (uint32_t i = 0; i < mTextTracks->Length(); i++) {
TextTrack* textTrack = (*mTextTracks)[i];
if (textTrack->Kind() == aTextTrackKind) {
aTextTracks.AppendElement(textTrack);
}
}
}
NS_IMETHODIMP
TextTrackManager::HandleEvent(Event* aEvent) {
if (!mTextTracks) {
return NS_OK;
}
nsAutoString type;
aEvent->GetType(type);
WEBVTT_LOG("Handle event %s", NS_ConvertUTF16toUTF8(type).get());
const bool setDirty = type.EqualsLiteral("seeked") ||
type.EqualsLiteral("resizecaption") ||
type.EqualsLiteral("resizevideocontrols");
const bool updateDisplay = type.EqualsLiteral("controlbarchange") ||
type.EqualsLiteral("resizecaption");
if (setDirty) {
for (uint32_t i = 0; i < mTextTracks->Length(); i++) {
((*mTextTracks)[i])->SetCuesDirty();
}
}
if (updateDisplay) {
UpdateCueDisplay();
}
return NS_OK;
}
class SimpleTextTrackEvent : public Runnable {
public:
friend class CompareSimpleTextTrackEvents;
SimpleTextTrackEvent(const nsAString& aEventName, double aTime,
TextTrack* aTrack, TextTrackCue* aCue)
: Runnable("dom::SimpleTextTrackEvent"),
mName(aEventName),
mTime(aTime),
mTrack(aTrack),
mCue(aCue) {}
NS_IMETHOD Run() override {
WEBVTT_LOGV("SimpleTextTrackEvent cue %p mName %s mTime %lf", mCue.get(),
NS_ConvertUTF16toUTF8(mName).get(), mTime);
mCue->DispatchTrustedEvent(mName);
return NS_OK;
}
void Dispatch() {
if (nsCOMPtr<nsIGlobalObject> global = mCue->GetOwnerGlobal()) {
global->Dispatch(TaskCategory::Other, do_AddRef(this));
} else {
NS_DispatchToMainThread(do_AddRef(this));
}
}
private:
nsString mName;
double mTime;
TextTrack* mTrack;
RefPtr<TextTrackCue> mCue;
};
class CompareSimpleTextTrackEvents {
private:
Maybe<uint32_t> TrackChildPosition(SimpleTextTrackEvent* aEvent) const {
if (aEvent->mTrack) {
HTMLTrackElement* trackElement = aEvent->mTrack->GetTrackElement();
if (trackElement) {
return mMediaElement->ComputeIndexOf(trackElement);
}
}
return Nothing();
}
HTMLMediaElement* mMediaElement;
public:
explicit CompareSimpleTextTrackEvents(HTMLMediaElement* aMediaElement) {
mMediaElement = aMediaElement;
}
bool Equals(SimpleTextTrackEvent* aOne, SimpleTextTrackEvent* aTwo) const {
return false;
}
bool LessThan(SimpleTextTrackEvent* aOne, SimpleTextTrackEvent* aTwo) const {
// TimeMarchesOn step 13.1.
if (aOne->mTime < aTwo->mTime) {
return true;
}
if (aOne->mTime > aTwo->mTime) {
return false;
}
// TimeMarchesOn step 13.2 text track cue order.
// TextTrack position in TextTrackList
TextTrack* t1 = aOne->mTrack;
TextTrack* t2 = aTwo->mTrack;
MOZ_ASSERT(t1, "CompareSimpleTextTrackEvents t1 is null");
MOZ_ASSERT(t2, "CompareSimpleTextTrackEvents t2 is null");
if (t1 != t2) {
TextTrackList* tList = t1->GetTextTrackList();
MOZ_ASSERT(tList, "CompareSimpleTextTrackEvents tList is null");
nsTArray<RefPtr<TextTrack>>& textTracks = tList->GetTextTrackArray();
auto index1 = textTracks.IndexOf(t1);
auto index2 = textTracks.IndexOf(t2);
if (index1 < index2) {
return true;
}
if (index1 > index2) {
return false;
}
}
MOZ_ASSERT(t1 == t2, "CompareSimpleTextTrackEvents t1 != t2");
// c1 and c2 are both belongs to t1.
TextTrackCue* c1 = aOne->mCue;
TextTrackCue* c2 = aTwo->mCue;
if (c1 != c2) {
if (c1->StartTime() < c2->StartTime()) {
return true;
}
if (c1->StartTime() > c2->StartTime()) {
return false;
}
if (c1->EndTime() < c2->EndTime()) {
return true;
}
if (c1->EndTime() > c2->EndTime()) {
return false;
}
TextTrackCueList* cueList = t1->GetCues();
MOZ_ASSERT(cueList);
nsTArray<RefPtr<TextTrackCue>>& cues = cueList->GetCuesArray();
auto index1 = cues.IndexOf(c1);
auto index2 = cues.IndexOf(c2);
if (index1 < index2) {
return true;
}
if (index1 > index2) {
return false;
}
}
// TimeMarchesOn step 13.3.
if (aOne->mName.EqualsLiteral("enter") ||
aTwo->mName.EqualsLiteral("exit")) {
return true;
}
return false;
}
};
class TextTrackListInternal {
public:
void AddTextTrack(TextTrack* aTextTrack,
const CompareTextTracks& aCompareTT) {
if (!mTextTracks.Contains(aTextTrack)) {
mTextTracks.InsertElementSorted(aTextTrack, aCompareTT);
}
}
uint32_t Length() const { return mTextTracks.Length(); }
TextTrack* operator[](uint32_t aIndex) {
return mTextTracks.SafeElementAt(aIndex, nullptr);
}
private:
nsTArray<RefPtr<TextTrack>> mTextTracks;
};
void TextTrackManager::DispatchUpdateCueDisplay() {
if (!mUpdateCueDisplayDispatched && !IsShutdown()) {
WEBVTT_LOG("DispatchUpdateCueDisplay");
nsPIDOMWindowInner* win = mMediaElement->OwnerDoc()->GetInnerWindow();
if (win) {
nsGlobalWindowInner::Cast(win)->Dispatch(
TaskCategory::Other,
NewRunnableMethod("dom::TextTrackManager::UpdateCueDisplay", this,
&TextTrackManager::UpdateCueDisplay));
mUpdateCueDisplayDispatched = true;
}
}
}
void TextTrackManager::DispatchTimeMarchesOn() {
// Run the algorithm if no previous instance is still running, otherwise
// enqueue the current playback position and whether only that changed
// through its usual monotonic increase during normal playback; current
// executing call upon completion will check queue for further 'work'.
if (!mTimeMarchesOnDispatched && !IsShutdown()) {
WEBVTT_LOG("DispatchTimeMarchesOn");
nsPIDOMWindowInner* win = mMediaElement->OwnerDoc()->GetInnerWindow();
if (win) {
nsGlobalWindowInner::Cast(win)->Dispatch(
TaskCategory::Other,
NewRunnableMethod("dom::TextTrackManager::TimeMarchesOn", this,
&TextTrackManager::TimeMarchesOn));
mTimeMarchesOnDispatched = true;
}
}
}
// https://html.spec.whatwg.org/multipage/embedded-content.html#time-marches-on
void TextTrackManager::TimeMarchesOn() {
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
mTimeMarchesOnDispatched = false;
CycleCollectedJSContext* context = CycleCollectedJSContext::Get();
if (context && context->IsInStableOrMetaStableState()) {
// FireTimeUpdate can be called while at stable state following a
// current position change which triggered a state watcher in MediaDecoder
// (see bug 1443429).
// TimeMarchesOn() will modify JS attributes which is forbidden while in
// stable state. So we dispatch a task to perform such operation later
// instead.
DispatchTimeMarchesOn();
return;
}
WEBVTT_LOG("TimeMarchesOn");
// Early return if we don't have any TextTracks or shutting down.
if (!mTextTracks || mTextTracks->Length() == 0 || IsShutdown() ||
!mMediaElement) {
return;
}
if (mMediaElement->ReadyState() == HTMLMediaElement_Binding::HAVE_NOTHING) {
WEBVTT_LOG(
"TimeMarchesOn return because media doesn't contain any data yet");
return;
}
if (mMediaElement->Seeking()) {
WEBVTT_LOG("TimeMarchesOn return during seeking");
return;
}
// Step 1, 2.
nsISupports* parentObject = mMediaElement->OwnerDoc()->GetParentObject();
if (NS_WARN_IF(!parentObject)) {
return;
}
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(parentObject);
RefPtr<TextTrackCueList> currentCues = new TextTrackCueList(window);
RefPtr<TextTrackCueList> otherCues = new TextTrackCueList(window);
// Step 3.
auto currentPlaybackTime =
media::TimeUnit::FromSeconds(mMediaElement->CurrentTime());
bool hasNormalPlayback = !mHasSeeked;
mHasSeeked = false;
WEBVTT_LOG(
"TimeMarchesOn mLastTimeMarchesOnCalled %lf currentPlaybackTime %lf "
"hasNormalPlayback %d",
mLastTimeMarchesOnCalled.ToSeconds(), currentPlaybackTime.ToSeconds(),
hasNormalPlayback);
// The reason we collect other cues is (1) to change active cues to inactive,
// (2) find missing cues, so we actually no need to process all cues. We just
// need to handle cues which are in the time interval [lastTime:currentTime]
// or [currentTime:lastTime] (seeking forward). That can help us to reduce the
// size of other cues, which can improve execution time.
auto start = std::min(mLastTimeMarchesOnCalled, currentPlaybackTime);
auto end = std::max(mLastTimeMarchesOnCalled, currentPlaybackTime);
media::TimeInterval interval(start, end);
WEBVTT_LOGV("TimeMarchesOn Time interval [%f:%f]", start.ToSeconds(),
end.ToSeconds());
for (uint32_t idx = 0; idx < mTextTracks->Length(); ++idx) {
TextTrack* track = (*mTextTracks)[idx];
if (track) {
track->GetCurrentCuesAndOtherCues(currentCues, otherCues, interval);
}
}
// Step 4.
RefPtr<TextTrackCueList> missedCues = new TextTrackCueList(window);
if (hasNormalPlayback) {
for (uint32_t i = 0; i < otherCues->Length(); ++i) {
TextTrackCue* cue = (*otherCues)[i];
if (cue->StartTime() >= mLastTimeMarchesOnCalled.ToSeconds() &&
cue->EndTime() <= currentPlaybackTime.ToSeconds()) {
missedCues->AddCue(*cue);
}
}
}
WEBVTT_LOGV("TimeMarchesOn currentCues %d", currentCues->Length());
WEBVTT_LOGV("TimeMarchesOn otherCues %d", otherCues->Length());
WEBVTT_LOGV("TimeMarchesOn missedCues %d", missedCues->Length());
// Step 5. Empty now.
// TODO: Step 6: fire timeupdate?
// Step 7. Abort steps if condition 1, 2, 3 are satisfied.
// 1. All of the cues in current cues have their active flag set.
// 2. None of the cues in other cues have their active flag set.
// 3. Missed cues is empty.
bool c1 = true;
for (uint32_t i = 0; i < currentCues->Length(); ++i) {
if (!(*currentCues)[i]->GetActive()) {
c1 = false;
break;
}
}
bool c2 = true;
for (uint32_t i = 0; i < otherCues->Length(); ++i) {
if ((*otherCues)[i]->GetActive()) {
c2 = false;
break;
}
}
bool c3 = (missedCues->Length() == 0);
if (c1 && c2 && c3) {
mLastTimeMarchesOnCalled = currentPlaybackTime;
WEBVTT_LOG("TimeMarchesOn step 7 return, mLastTimeMarchesOnCalled %lf",
mLastTimeMarchesOnCalled.ToSeconds());
return;
}
// Step 8. Respect PauseOnExit flag if not seek.
if (hasNormalPlayback) {
for (uint32_t i = 0; i < otherCues->Length(); ++i) {
TextTrackCue* cue = (*otherCues)[i];
if (cue && cue->PauseOnExit() && cue->GetActive()) {
WEBVTT_LOG("TimeMarchesOn pause the MediaElement");
mMediaElement->Pause();
break;
}
}
for (uint32_t i = 0; i < missedCues->Length(); ++i) {
TextTrackCue* cue = (*missedCues)[i];
if (cue && cue->PauseOnExit()) {
WEBVTT_LOG("TimeMarchesOn pause the MediaElement");
mMediaElement->Pause();
break;
}
}
}
// Step 15.
// Sort text tracks in the same order as the text tracks appear
// in the media element's list of text tracks, and remove
// duplicates.
TextTrackListInternal affectedTracks;
// Step 13, 14.
nsTArray<RefPtr<SimpleTextTrackEvent>> eventList;
// Step 9, 10.
// For each text track cue in missed cues, prepare an event named
// enter for the TextTrackCue object with the cue start time.
for (uint32_t i = 0; i < missedCues->Length(); ++i) {
TextTrackCue* cue = (*missedCues)[i];
if (cue) {
WEBVTT_LOG("Prepare 'enter' event for cue %p [%f, %f] in missing cues",
cue, cue->StartTime(), cue->EndTime());
SimpleTextTrackEvent* event = new SimpleTextTrackEvent(
u"enter"_ns, cue->StartTime(), cue->GetTrack(), cue);
eventList.InsertElementSorted(
event, CompareSimpleTextTrackEvents(mMediaElement));
affectedTracks.AddTextTrack(cue->GetTrack(),
CompareTextTracks(mMediaElement));
}
}
// Step 11, 17.
for (uint32_t i = 0; i < otherCues->Length(); ++i) {
TextTrackCue* cue = (*otherCues)[i];
if (cue->GetActive() || missedCues->IsCueExist(cue)) {
double time =
cue->StartTime() > cue->EndTime() ? cue->StartTime() : cue->EndTime();
WEBVTT_LOG("Prepare 'exit' event for cue %p [%f, %f] in other cues", cue,
cue->StartTime(), cue->EndTime());
SimpleTextTrackEvent* event =
new SimpleTextTrackEvent(u"exit"_ns, time, cue->GetTrack(), cue);
eventList.InsertElementSorted(
event, CompareSimpleTextTrackEvents(mMediaElement));
affectedTracks.AddTextTrack(cue->GetTrack(),
CompareTextTracks(mMediaElement));
}
cue->SetActive(false);
}
// Step 12, 17.
for (uint32_t i = 0; i < currentCues->Length(); ++i) {
TextTrackCue* cue = (*currentCues)[i];
if (!cue->GetActive()) {
WEBVTT_LOG("Prepare 'enter' event for cue %p [%f, %f] in current cues",
cue, cue->StartTime(), cue->EndTime());
SimpleTextTrackEvent* event = new SimpleTextTrackEvent(
u"enter"_ns, cue->StartTime(), cue->GetTrack(), cue);
eventList.InsertElementSorted(
event, CompareSimpleTextTrackEvents(mMediaElement));
affectedTracks.AddTextTrack(cue->GetTrack(),
CompareTextTracks(mMediaElement));
}
cue->SetActive(true);
}
// Fire the eventList
for (uint32_t i = 0; i < eventList.Length(); ++i) {
eventList[i]->Dispatch();
}
// Step 16.
for (uint32_t i = 0; i < affectedTracks.Length(); ++i) {
TextTrack* ttrack = affectedTracks[i];
if (ttrack) {
ttrack->DispatchAsyncTrustedEvent(u"cuechange"_ns);
HTMLTrackElement* trackElement = ttrack->GetTrackElement();
if (trackElement) {
trackElement->DispatchTrackRunnable(u"cuechange"_ns);
}
}
}
mLastTimeMarchesOnCalled = currentPlaybackTime;
// Step 18.
UpdateCueDisplay();
}
void TextTrackManager::NotifyCueUpdated(TextTrackCue* aCue) {
// TODO: Add/Reorder the cue to mNewCues if we have some optimization?
WEBVTT_LOG("NotifyCueUpdated, cue=%p", aCue);
MaybeRunTimeMarchesOn();
// For the case "Texttrack.mode = hidden/showing", if the mode
// changing between showing and hidden, TimeMarchesOn
// doesn't render the cue. Call DispatchUpdateCueDisplay() explicitly.
DispatchUpdateCueDisplay();
}
void TextTrackManager::NotifyReset() {
// https://html.spec.whatwg.org/multipage/media.html#text-track-cue-active-flag
// This will unset all cues' active flag and update the cue display.
WEBVTT_LOG("NotifyReset");
mLastTimeMarchesOnCalled = media::TimeUnit::Zero();
for (uint32_t idx = 0; idx < mTextTracks->Length(); ++idx) {
(*mTextTracks)[idx]->SetCuesInactive();
}
UpdateCueDisplay();
}
void TextTrackManager::ReportTelemetryForTrack(TextTrack* aTextTrack) const {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aTextTrack);
MOZ_ASSERT(mTextTracks->Length() > 0);
TextTrackKind kind = aTextTrack->Kind();
Telemetry::Accumulate(Telemetry::WEBVTT_TRACK_KINDS, uint32_t(kind));
}
bool TextTrackManager::IsLoaded() {
return mTextTracks ? mTextTracks->AreTextTracksLoaded() : true;
}
bool TextTrackManager::IsShutdown() const {
return (mShutdown || !sParserWrapper);
}
void TextTrackManager::MaybeRunTimeMarchesOn() {
MOZ_ASSERT(mMediaElement);
// According to spec, we should check media element's show poster flag before
// running `TimeMarchesOn` in following situations, (1) add cue (2) remove cue
// (3) cue's start time changes (4) cues's end time changes
// https://html.spec.whatwg.org/multipage/media.html#playing-the-media-resource:time-marches-on
// https://html.spec.whatwg.org/multipage/media.html#text-track-api:time-marches-on
if (mMediaElement->GetShowPosterFlag()) {
return;
}
TimeMarchesOn();
}
} // namespace mozilla::dom
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