NS_IMETHODIMP
TextTrackManager::HandleEvent(Event* aEvent) {
if (!mTextTracks) {
return NS_OK;
}
nsAutoString type;
aEvent->GetType(type);
if (type.EqualsLiteral("resizevideocontrols") ||
type.EqualsLiteral("seeked")) {
for (uint32_t i = 0; i < mTextTracks->Length(); i++) {
((*mTextTracks)[i])->SetCuesDirty();
}
}
if (type.EqualsLiteral("controlbarchange")) {
UpdateCueDisplay();
}
return NS_OK;
}
// https://html.spec.whatwg.org/multipage/embedded-content.html#time-marches-on
void
TextTrackManager::TimeMarchesOn()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
WEBVTT_LOG("TimeMarchesOn");
mTimeMarchesOnDispatched = false;
// Early return if we don't have any TextTracks or shutting down.
if (!mTextTracks || mTextTracks->Length() == 0 || mShutdown) {
return;
}
nsISupports* parentObject =
mMediaElement->OwnerDoc()->GetParentObject();
if (NS_WARN_IF(!parentObject)) {
return;
}
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(parentObject);
if (mMediaElement &&
(!(mMediaElement->GetPlayedOrSeeked()) || mMediaElement->Seeking())) {
WEBVTT_LOG("TimeMarchesOn seeking or post return");
return;
}
// Step 3.
double currentPlaybackTime = mMediaElement->CurrentTime();
bool hasNormalPlayback = !mHasSeeked;
mHasSeeked = false;
WEBVTT_LOG("TimeMarchesOn mLastTimeMarchesOnCalled %lf currentPlaybackTime %lf hasNormalPlayback %d"
, mLastTimeMarchesOnCalled, currentPlaybackTime, hasNormalPlayback);
// Step 1, 2.
RefPtr<TextTrackCueList> currentCues =
new TextTrackCueList(window);
RefPtr<TextTrackCueList> otherCues =
new TextTrackCueList(window);
bool dummy;
for (uint32_t index = 0; index < mTextTracks->Length(); ++index) {
TextTrack* ttrack = mTextTracks->IndexedGetter(index, dummy);
if (ttrack && dummy) {
// TODO: call GetCueListByTimeInterval on mNewCues?
ttrack->UpdateActiveCueList();
TextTrackCueList* activeCueList = ttrack->GetActiveCues();
if (activeCueList) {
for (uint32_t i = 0; i < activeCueList->Length(); ++i) {
currentCues->AddCue(*((*activeCueList)[i]));
}
}
}
}
WEBVTT_LOGV("TimeMarchesOn currentCues %d", currentCues->Length());
// Populate otherCues with 'non-active" cues.
if (hasNormalPlayback) {
if (currentPlaybackTime < mLastTimeMarchesOnCalled) {
// TODO: Add log and find the root cause why the
// playback position goes backward.
mLastTimeMarchesOnCalled = currentPlaybackTime;
}
media::Interval<double> interval(mLastTimeMarchesOnCalled,
currentPlaybackTime);
otherCues = mNewCues->GetCueListByTimeInterval(interval);;
} else {
// Seek case. Put the mLastActiveCues into otherCues.
otherCues = mLastActiveCues;
}
for (uint32_t i = 0; i < currentCues->Length(); ++i) {
TextTrackCue* cue = (*currentCues)[i];
otherCues->RemoveCue(*cue);
}
WEBVTT_LOGV("TimeMarchesOn otherCues %d", otherCues->Length());
// 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 &&
cue->EndTime() <= currentPlaybackTime) {
missedCues->AddCue(*cue);
}
}
}
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);
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) {
SimpleTextTrackEvent* event =
new SimpleTextTrackEvent(NS_LITERAL_STRING("enter"),
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();
SimpleTextTrackEvent* event =
new SimpleTextTrackEvent(NS_LITERAL_STRING("exit"), 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()) {
SimpleTextTrackEvent* event =
new SimpleTextTrackEvent(NS_LITERAL_STRING("enter"),
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) {
NS_DispatchToMainThread(eventList[i].forget());
}
// Step 16.
for (uint32_t i = 0; i < affectedTracks.Length(); ++i) {
TextTrack* ttrack = affectedTracks[i];
if (ttrack) {
ttrack->DispatchAsyncTrustedEvent(NS_LITERAL_STRING("cuechange"));
HTMLTrackElement* trackElement = ttrack->GetTrackElement();
if (trackElement) {
trackElement->DispatchTrackRunnable(NS_LITERAL_STRING("cuechange"));
}
}
}
mLastTimeMarchesOnCalled = currentPlaybackTime;
mLastActiveCues = currentCues;
// Step 18.
UpdateCueDisplay();
}
