void MediaSource::setDurationInternal(const MediaTime& duration)
{
// Duration Change Algorithm
// https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#duration-change-algorithm
// 1. If the current value of duration is equal to new duration, then return.
if (duration == m_duration)
return;
// 2. Set old duration to the current value of duration.
MediaTime oldDuration = m_duration;
// 3. Update duration to new duration.
m_duration = duration;
// 4. If the new duration is less than old duration, then call remove(new duration, old duration)
// on all objects in sourceBuffers.
if (oldDuration.isValid() && duration < oldDuration) {
for (auto& sourceBuffer : *m_sourceBuffers)
sourceBuffer->rangeRemoval(duration, oldDuration);
}
// 5. If a user agent is unable to partially render audio frames or text cues that start before and end after the
// duration, then run the following steps:
// 5.1 Update new duration to the highest end time reported by the buffered attribute across all SourceBuffer objects
// in sourceBuffers.
// 5.2 Update duration to new duration.
// NOTE: Assume UA is able to partially render audio frames.
// 6. Update the media controller duration to new duration and run the HTMLMediaElement duration change algorithm.
LOG(MediaSource, "MediaSource::setDurationInternal(%p) - duration(%g)", this, duration.toDouble());
m_private->durationChanged();
}
