C++ MediaStream::AddDirectTrackListenerImpl方法代码示例

void
TrackUnionStream::AddDirectTrackListenerImpl(already_AddRefed<DirectMediaStreamTrackListener> aListener,
                                             TrackID aTrackID)
{
  RefPtr<DirectMediaStreamTrackListener> listener = aListener;

  for (TrackMapEntry& entry : mTrackMap) {
    if (entry.mOutputTrackID == aTrackID) {
      MediaStream* source = entry.mInputPort->GetSource();
      STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p adding direct listener "
                                   "%p for track %d. Forwarding to input "
                                   "stream %p track %d.",
                                   this, listener.get(), aTrackID, source,
                                   entry.mInputTrackID));
      entry.mOwnedDirectListeners.AppendElement(listener);
      DisabledTrackMode currentMode = GetDisabledTrackMode(aTrackID);
      if (currentMode != DisabledTrackMode::ENABLED) {
        listener->IncreaseDisabled(currentMode);
      }
      source->AddDirectTrackListenerImpl(listener.forget(),
                                         entry.mInputTrackID);
      return;
    }
  }

  TrackBound<DirectMediaStreamTrackListener>* bound =
    mPendingDirectTrackListeners.AppendElement();
  bound->mListener = listener.forget();
  bound->mTrackID = aTrackID;
}

  uint32_t TrackUnionStream::AddTrack(MediaInputPort* aPort, StreamTracks::Track* aTrack,
                    GraphTime aFrom)
  {
    STREAM_LOG(LogLevel::Verbose, ("TrackUnionStream %p adding track %d for "
                                   "input stream %p track %d, desired id %d",
                                   this, aTrack->GetID(), aPort->GetSource(),
                                   aTrack->GetID(),
                                   aPort->GetDestinationTrackId()));

    TrackID id;
    if (IsTrackIDExplicit(id = aPort->GetDestinationTrackId())) {
      MOZ_ASSERT(id >= mNextAvailableTrackID &&
                 mUsedTracks.BinaryIndexOf(id) == mUsedTracks.NoIndex,
                 "Desired destination id taken. Only provide a destination ID "
                 "if you can assure its availability, or we may not be able "
                 "to bind to the correct DOM-side track.");
#ifdef DEBUG
      for (size_t i = 0; mInputs[i] != aPort; ++i) {
        MOZ_ASSERT(mInputs[i]->GetSourceTrackId() != TRACK_ANY,
                   "You are adding a MediaInputPort with a track mapping "
                   "while there already exist generic MediaInputPorts for this "
                   "destination stream. This can lead to TrackID collisions!");
      }
#endif
      mUsedTracks.InsertElementSorted(id);
    } else if ((id = aTrack->GetID()) &&
               id > mNextAvailableTrackID &&
               mUsedTracks.BinaryIndexOf(id) == mUsedTracks.NoIndex) {
      // Input id available. Mark it used in mUsedTracks.
      mUsedTracks.InsertElementSorted(id);
    } else {
      // No desired destination id and Input id taken, allocate a new one.
      id = mNextAvailableTrackID;

      // Update mNextAvailableTrackID and prune any mUsedTracks members it now
      // covers.
      while (1) {
        if (!mUsedTracks.RemoveElementSorted(++mNextAvailableTrackID)) {
          // Not in use. We're done.
          break;
        }
      }
    }

    // Round up the track start time so the track, if anything, starts a
    // little later than the true time. This means we'll have enough
    // samples in our input stream to go just beyond the destination time.
    StreamTime outputStart = GraphTimeToStreamTimeWithBlocking(aFrom);

    nsAutoPtr<MediaSegment> segment;
    segment = aTrack->GetSegment()->CreateEmptyClone();
    for (uint32_t j = 0; j < mListeners.Length(); ++j) {
      MediaStreamListener* l = mListeners[j];
      l->NotifyQueuedTrackChanges(Graph(), id, outputStart,
                                  TrackEventCommand::TRACK_EVENT_CREATED,
                                  *segment,
                                  aPort->GetSource(), aTrack->GetID());
    }
    segment->AppendNullData(outputStart);
    StreamTracks::Track* track =
      &mTracks.AddTrack(id, outputStart, segment.forget());
    STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p added track %d for input stream %p track %d, start ticks %lld",
                                 this, track->GetID(), aPort->GetSource(), aTrack->GetID(),
                                 (long long)outputStart));

    TrackMapEntry* map = mTrackMap.AppendElement();
    map->mEndOfConsumedInputTicks = 0;
    map->mEndOfLastInputIntervalInInputStream = -1;
    map->mEndOfLastInputIntervalInOutputStream = -1;
    map->mInputPort = aPort;
    map->mInputTrackID = aTrack->GetID();
    map->mOutputTrackID = track->GetID();
    map->mSegment = aTrack->GetSegment()->CreateEmptyClone();

    for (int32_t i = mPendingDirectTrackListeners.Length() - 1; i >= 0; --i) {
      TrackBound<DirectMediaStreamTrackListener>& bound =
        mPendingDirectTrackListeners[i];
      if (bound.mTrackID != map->mOutputTrackID) {
        continue;
      }
      MediaStream* source = map->mInputPort->GetSource();
      map->mOwnedDirectListeners.AppendElement(bound.mListener);
      DisabledTrackMode currentMode = GetDisabledTrackMode(bound.mTrackID);
      if (currentMode != DisabledTrackMode::ENABLED) {
        bound.mListener->IncreaseDisabled(currentMode);
      }
      STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p adding direct listener "
                                   "%p for track %d. Forwarding to input "
                                   "stream %p track %d.",
                                   this, bound.mListener.get(), bound.mTrackID,
                                   source, map->mInputTrackID));
      source->AddDirectTrackListenerImpl(bound.mListener.forget(),
                                         map->mInputTrackID);
      mPendingDirectTrackListeners.RemoveElementAt(i);
    }

    return mTrackMap.Length() - 1;
  }