std::vector<WebMediaPlayer::TrackId> SourceBuffer::initializationSegmentReceived(const std::vector<MediaTrackInfo>& newTracks)
{
WTF_LOG(Media, "SourceBuffer::initializationSegmentReceived %p tracks=%zu", this, newTracks.size());
ASSERT(m_source);
ASSERT(m_source->mediaElement());
ASSERT(m_updating);
// TODO(servolk): Implement proper 'initialization segment received' algorithm according to MSE spec:
// https://w3c.github.io/media-source/#sourcebuffer-init-segment-received
std::vector<WebMediaPlayer::TrackId> result;
for (const auto& trackInfo : newTracks) {
const auto& trackType = std::get<0>(trackInfo);
const auto& id = std::get<1>(trackInfo);
const auto& kind = std::get<2>(trackInfo);
const auto& label = std::get<3>(trackInfo);
const auto& language = std::get<4>(trackInfo);
if (!RuntimeEnabledFeatures::audioVideoTracksEnabled()) {
static WebMediaPlayer::TrackId nextTrackId = 0;
result.push_back(++nextTrackId);
continue;
}
const TrackBase* trackBase = nullptr;
if (trackType == WebMediaPlayer::AudioTrack) {
AudioTrack* audioTrack = nullptr;
if (!m_firstInitializationSegmentReceived) {
audioTrack = AudioTrack::create(id, kind, label, language, false);
audioTracks().add(audioTrack);
m_source->mediaElement()->audioTracks().add(audioTrack);
} else {
audioTrack = findExistingTrackById(audioTracks(), id);
ASSERT(audioTrack);
}
trackBase = audioTrack;
result.push_back(audioTrack->trackId());
} else if (trackType == WebMediaPlayer::VideoTrack) {
VideoTrack* videoTrack = nullptr;
if (!m_firstInitializationSegmentReceived) {
videoTrack = VideoTrack::create(id, kind, label, language, false);
videoTracks().add(videoTrack);
m_source->mediaElement()->videoTracks().add(videoTrack);
} else {
videoTrack = findExistingTrackById(videoTracks(), id);
ASSERT(videoTrack);
}
trackBase = videoTrack;
result.push_back(videoTrack->trackId());
} else {
NOTREACHED();
}
(void)trackBase;
#if !LOG_DISABLED
const char* logActionStr = m_firstInitializationSegmentReceived ? "using existing" : "added";
const char* logTrackTypeStr = (trackType == WebMediaPlayer::AudioTrack) ? "audio" : "video";
WTF_LOG(Media, "Tracks (sb=%p): %s %sTrack %p trackId=%d id=%s label=%s lang=%s", this, logActionStr, logTrackTypeStr, trackBase, trackBase->trackId(), trackBase->id().utf8().data(), trackBase->label().utf8().data(), trackBase->language().utf8().data());
#endif
}
if (!m_firstInitializationSegmentReceived) {
// 5. If active track flag equals true, then run the following steps:
// 5.1. Add this SourceBuffer to activeSourceBuffers.
// 5.2. Queue a task to fire a simple event named addsourcebuffer at
// activesourcebuffers.
m_source->setSourceBufferActive(this);
// 6. Set first initialization segment received flag to true.
m_firstInitializationSegmentReceived = true;
}
return result;
}
