bool TextTrack::hasCue(TextTrackCue* cue, TextTrackCue::CueMatchRules match)
{
if (cue->startMediaTime() < MediaTime::zeroTime() || cue->endMediaTime() < MediaTime::zeroTime())
return false;
if (!m_cues || !m_cues->length())
return false;
size_t searchStart = 0;
size_t searchEnd = m_cues->length();
while (1) {
ASSERT(searchStart <= m_cues->length());
ASSERT(searchEnd <= m_cues->length());
TextTrackCue* existingCue;
// Cues in the TextTrackCueList are maintained in start time order.
if (searchStart == searchEnd) {
if (!searchStart)
return false;
// If there is more than one cue with the same start time, back up to first one so we
// consider all of them.
while (searchStart >= 2 && cue->hasEquivalentStartTime(*m_cues->item(searchStart - 2)))
--searchStart;
bool firstCompare = true;
while (1) {
if (!firstCompare)
++searchStart;
firstCompare = false;
if (searchStart > m_cues->length())
return false;
existingCue = m_cues->item(searchStart - 1);
if (!existingCue)
return false;
if (cue->startMediaTime() > (existingCue->startMediaTime() + startTimeVariance()))
return false;
if (existingCue->isEqual(*cue, match))
return true;
}
}
size_t index = (searchStart + searchEnd) / 2;
existingCue = m_cues->item(index);
if ((cue->startMediaTime() + startTimeVariance()) < existingCue->startMediaTime() || (match != TextTrackCue::IgnoreDuration && cue->hasEquivalentStartTime(*existingCue) && cue->endMediaTime() > existingCue->endMediaTime()))
searchEnd = index;
else
searchStart = index + 1;
}
ASSERT_NOT_REACHED();
return false;
}
bool TextTrackCue::doesExtendCue(const TextTrackCue& cue) const
{
if (!cueContentsMatch(cue))
return false;
if (endMediaTime() != cue.startMediaTime())
return false;
return true;
}
bool TextTrackCue::hasEquivalentStartTime(const TextTrackCue& cue) const
{
MediaTime startTimeVariance = MediaTime::zeroTime();
if (track())
startTimeVariance = track()->startTimeVariance();
else if (cue.track())
startTimeVariance = cue.track()->startTimeVariance();
return abs(abs(startMediaTime()) - abs(cue.startMediaTime())) <= startTimeVariance;
}