C++ streambuffer::Track类代码示例

  uint32_t TrackUnionStream::AddTrack(MediaInputPort* aPort, StreamBuffer::Track* aTrack,
                    GraphTime aFrom)
  {
    TrackID id = aTrack->GetID();
    if (id > mNextAvailableTrackID &&
       mUsedTracks.BinaryIndexOf(id) == mUsedTracks.NoIndex) {
      // Input id available. Mark it used in mUsedTracks.
      mUsedTracks.InsertElementSorted(id);
    } else {
      // 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,
                                  MediaStreamListener::TRACK_EVENT_CREATED,
                                  *segment,
                                  aPort->GetSource(), aTrack->GetID());
    }
    segment->AppendNullData(outputStart);
    StreamBuffer::Track* track =
      &mBuffer.AddTrack(id, outputStart, segment.forget());
    STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p adding track %d for input stream %p track %d, start ticks %lld",
                              this, id, 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();
    return mTrackMap.Length() - 1;
  }

  uint32_t TrackUnionStream::AddTrack(MediaInputPort* aPort, StreamBuffer::Track* aTrack,
                    GraphTime aFrom)
  {
    // Use the ID of the source track if it's not already assigned to a track,
    // otherwise allocate a new unique ID.
    TrackID id = aTrack->GetID();
    TrackID maxTrackID = 0;
    for (uint32_t i = 0; i < mTrackMap.Length(); ++i) {
      TrackID outID = mTrackMap[i].mOutputTrackID;
      maxTrackID = std::max(maxTrackID, outID);
    }
    // Note: we might have removed it here, but it might still be in the
    // StreamBuffer if the TrackUnionStream sees its input stream flip from
    // A to B, where both A and B have a track with the same ID
    while (1) {
      // search until we find one not in use here, and not in mBuffer
      if (!mBuffer.FindTrack(id)) {
        break;
      }
      id = ++maxTrackID;
    }

    // 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 = GraphTimeToStreamTime(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,
                                  MediaStreamListener::TRACK_EVENT_CREATED,
                                  *segment);
    }
    segment->AppendNullData(outputStart);
    StreamBuffer::Track* track =
      &mBuffer.AddTrack(id, outputStart, segment.forget());
    STREAM_LOG(PR_LOG_DEBUG, ("TrackUnionStream %p adding track %d for input stream %p track %d, start ticks %lld",
                              this, id, 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();
    return mTrackMap.Length() - 1;
  }

void
AudioNodeStream::FinishOutput()
{
  StreamBuffer::Track* track = EnsureTrack(AUDIO_TRACK);
  track->SetEnded();

  for (uint32_t j = 0; j < mListeners.Length(); ++j) {
    MediaStreamListener* l = mListeners[j];
    AudioSegment emptySegment;
    l->NotifyQueuedTrackChanges(Graph(), AUDIO_TRACK,
                                track->GetSegment()->GetDuration(),
                                MediaStreamListener::TRACK_EVENT_ENDED, emptySegment);
  }
}

  void TrackUnionStream::CopyTrackData(StreamBuffer::Track* aInputTrack,
                     uint32_t aMapIndex, GraphTime aFrom, GraphTime aTo,
                     bool* aOutputTrackFinished)
  {
    TrackMapEntry* map = &mTrackMap[aMapIndex];
    StreamBuffer::Track* outputTrack = mBuffer.FindTrack(map->mOutputTrackID);
    MOZ_ASSERT(outputTrack && !outputTrack->IsEnded(), "Can't copy to ended track");

    MediaSegment* segment = map->mSegment;
    MediaStream* source = map->mInputPort->GetSource();

    GraphTime next;
    *aOutputTrackFinished = false;
    for (GraphTime t = aFrom; t < aTo; t = next) {
      MediaInputPort::InputInterval interval = map->mInputPort->GetNextInputInterval(t);
      interval.mEnd = std::min(interval.mEnd, aTo);
      StreamTime inputEnd = source->GraphTimeToStreamTime(interval.mEnd);
      StreamTime inputTrackEndPoint = STREAM_TIME_MAX;

      if (aInputTrack->IsEnded() &&
          aInputTrack->GetEnd() <= inputEnd) {
        inputTrackEndPoint = aInputTrack->GetEnd();
        *aOutputTrackFinished = true;
      }

      if (interval.mStart >= interval.mEnd) {
        break;
      }
      StreamTime ticks = interval.mEnd - interval.mStart;
      next = interval.mEnd;

      StreamTime outputStart = outputTrack->GetEnd();

      if (interval.mInputIsBlocked) {
        // Maybe the input track ended?
        segment->AppendNullData(ticks);
        STREAM_LOG(PR_LOG_DEBUG+1, ("TrackUnionStream %p appending %lld ticks of null data to track %d",
                   this, (long long)ticks, outputTrack->GetID()));
      } else if (InMutedCycle()) {
        segment->AppendNullData(ticks);
      } else {
        MOZ_ASSERT(outputTrack->GetEnd() == GraphTimeToStreamTime(interval.mStart),
                   "Samples missing");
        StreamTime inputStart = source->GraphTimeToStreamTime(interval.mStart);
        segment->AppendSlice(*aInputTrack->GetSegment(),
                             std::min(inputTrackEndPoint, inputStart),
                             std::min(inputTrackEndPoint, inputEnd));
      }
      ApplyTrackDisabling(outputTrack->GetID(), segment);
      for (uint32_t j = 0; j < mListeners.Length(); ++j) {
        MediaStreamListener* l = mListeners[j];
        l->NotifyQueuedTrackChanges(Graph(), outputTrack->GetID(),
                                    outputStart, 0, *segment);
      }
      outputTrack->GetSegment()->AppendFrom(segment);
    }
  }

size_t
AudioNodeExternalInputStream::GetTrackMapEntry(const StreamBuffer::Track& aTrack,
                                               GraphTime aFrom)
{
  AudioSegment* segment = aTrack.Get<AudioSegment>();

  // Check the map for an existing entry corresponding to the input track.
  for (size_t i = 0; i < mTrackMap.Length(); ++i) {
    TrackMapEntry* map = &mTrackMap[i];
    if (map->mTrackID == aTrack.GetID()) {
      return i;
    }
  }

  // Determine channel count by finding the first entry with non-silent data.
  AudioSegment::ChunkIterator ci(*segment);
  while (!ci.IsEnded() && ci->IsNull()) {
    ci.Next();
  }
  if (ci.IsEnded()) {
    // The track is entirely silence so far, we can ignore it for now.
    return nsTArray<TrackMapEntry>::NoIndex;
  }

  // Create a speex resampler with the same sample rate and number of channels
  // as the track.
  SpeexResamplerState* resampler = nullptr;
  size_t channelCount = std::min((*ci).mChannelData.Length(),
                                   WebAudioUtils::MaxChannelCount);
  if (aTrack.GetRate() != mSampleRate) {
    resampler = speex_resampler_init(channelCount,
      aTrack.GetRate(), mSampleRate, SPEEX_RESAMPLER_QUALITY_DEFAULT, nullptr);
    speex_resampler_skip_zeros(resampler);
  }

  TrackMapEntry* map = mTrackMap.AppendElement();
  map->mEndOfConsumedInputTicks = 0;
  map->mEndOfLastInputIntervalInInputStream = -1;
  map->mEndOfLastInputIntervalInOutputStream = -1;
  map->mSamplesPassedToResampler =
    TimeToTicksRoundUp(aTrack.GetRate(), GraphTimeToStreamTime(aFrom));
  map->mResampler = resampler;
  map->mResamplerChannelCount = channelCount;
  map->mTrackID = aTrack.GetID();
  return mTrackMap.Length() - 1;
}

void
AudioNodeStream::FinishOutput()
{
  if (IsFinishedOnGraphThread()) {
    return;
  }

  StreamBuffer::Track* track = EnsureTrack();
  track->SetEnded();
  FinishOnGraphThread();

  for (uint32_t j = 0; j < mListeners.Length(); ++j) {
    MediaStreamListener* l = mListeners[j];
    AudioSegment emptySegment;
    l->NotifyQueuedTrackChanges(Graph(), AUDIO_NODE_STREAM_TRACK_ID,
                                IdealAudioRate(),
                                track->GetSegment()->GetDuration(),
                                MediaStreamListener::TRACK_EVENT_ENDED, emptySegment);
  }
}

void
DOMHwMediaStream::SetImageSize(uint32_t width, uint32_t height)
{
#ifdef MOZ_WIDGET_GONK
  OverlayImage::Data imgData;

  imgData.mOverlayId = mOverlayImage->GetOverlayId();
  imgData.mSize = IntSize(width, height);
  mOverlayImage->SetData(imgData);
#endif

  SourceMediaStream* srcStream = GetInputStream()->AsSourceStream();
  StreamBuffer::Track* track = srcStream->FindTrack(TRACK_VIDEO_PRIMARY);

  if (!track || !track->GetSegment()) {
    return;
  }

#ifdef MOZ_WIDGET_GONK
  // Clear the old segment.
  // Changing the existing content of segment is a Very BAD thing, and this way will
  // confuse consumers of MediaStreams.
  // It is only acceptable for DOMHwMediaStream
  // because DOMHwMediaStream doesn't have consumers of TV streams currently.
  track->GetSegment()->Clear();

  // Change the image size.
  const StreamTime delta = STREAM_TIME_MAX;
  RefPtr<Image> image = static_cast<Image*>(mOverlayImage.get());
  mozilla::gfx::IntSize size = image->GetSize();
  VideoSegment segment;

  segment.AppendFrame(image.forget(), delta, size);
  srcStream->AppendToTrack(TRACK_VIDEO_PRIMARY, &segment);
#endif
}

 void TrackUnionStream::EndTrack(uint32_t aIndex)
 {
   StreamBuffer::Track* outputTrack = mBuffer.FindTrack(mTrackMap[aIndex].mOutputTrackID);
   if (!outputTrack || outputTrack->IsEnded())
     return;
   STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p ending track %d", this, outputTrack->GetID()));
   for (uint32_t j = 0; j < mListeners.Length(); ++j) {
     MediaStreamListener* l = mListeners[j];
     StreamTime offset = outputTrack->GetSegment()->GetDuration();
     nsAutoPtr<MediaSegment> segment;
     segment = outputTrack->GetSegment()->CreateEmptyClone();
     l->NotifyQueuedTrackChanges(Graph(), outputTrack->GetID(), offset,
                                 MediaStreamListener::TRACK_EVENT_ENDED,
                                 *segment,
                                 mTrackMap[aIndex].mInputPort->GetSource(),
                                 mTrackMap[aIndex].mInputTrackID);
   }
   outputTrack->SetEnded();
 }

 void TrackUnionStream::ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags)
 {
   if (IsFinishedOnGraphThread()) {
     return;
   }
   nsAutoTArray<bool,8> mappedTracksFinished;
   nsAutoTArray<bool,8> mappedTracksWithMatchingInputTracks;
   for (uint32_t i = 0; i < mTrackMap.Length(); ++i) {
     mappedTracksFinished.AppendElement(true);
     mappedTracksWithMatchingInputTracks.AppendElement(false);
   }
   bool allFinished = !mInputs.IsEmpty();
   bool allHaveCurrentData = !mInputs.IsEmpty();
   for (uint32_t i = 0; i < mInputs.Length(); ++i) {
     MediaStream* stream = mInputs[i]->GetSource();
     if (!stream->IsFinishedOnGraphThread()) {
       // XXX we really should check whether 'stream' has finished within time aTo,
       // not just that it's finishing when all its queued data eventually runs
       // out.
       allFinished = false;
     }
     if (!stream->HasCurrentData()) {
       allHaveCurrentData = false;
     }
     bool trackAdded = false;
     for (StreamBuffer::TrackIter tracks(stream->GetStreamBuffer());
          !tracks.IsEnded(); tracks.Next()) {
       bool found = false;
       for (uint32_t j = 0; j < mTrackMap.Length(); ++j) {
         TrackMapEntry* map = &mTrackMap[j];
         if (map->mInputPort == mInputs[i] && map->mInputTrackID == tracks->GetID()) {
           bool trackFinished;
           StreamBuffer::Track* outputTrack = mBuffer.FindTrack(map->mOutputTrackID);
           if (!outputTrack || outputTrack->IsEnded()) {
             trackFinished = true;
           } else {
             CopyTrackData(tracks.get(), j, aFrom, aTo, &trackFinished);
           }
           mappedTracksFinished[j] = trackFinished;
           mappedTracksWithMatchingInputTracks[j] = true;
           found = true;
           break;
         }
       }
       if (!found && (!mFilterCallback || mFilterCallback(tracks.get()))) {
         bool trackFinished = false;
         trackAdded = true;
         uint32_t mapIndex = AddTrack(mInputs[i], tracks.get(), aFrom);
         CopyTrackData(tracks.get(), mapIndex, aFrom, aTo, &trackFinished);
         mappedTracksFinished.AppendElement(trackFinished);
         mappedTracksWithMatchingInputTracks.AppendElement(true);
       }
     }
     if (trackAdded) {
       for (MediaStreamListener* l : mListeners) {
         l->NotifyFinishedTrackCreation(Graph());
       }
     }
   }
   for (int32_t i = mTrackMap.Length() - 1; i >= 0; --i) {
     if (mappedTracksFinished[i]) {
       EndTrack(i);
     } else {
       allFinished = false;
     }
     if (!mappedTracksWithMatchingInputTracks[i]) {
       mTrackMap.RemoveElementAt(i);
     }
   }
   if (allFinished && mAutofinish && (aFlags & ALLOW_FINISH)) {
     // All streams have finished and won't add any more tracks, and
     // all our tracks have actually finished and been removed from our map,
     // so we're finished now.
     FinishOnGraphThread();
   } else {
     mBuffer.AdvanceKnownTracksTime(GraphTimeToStreamTime(aTo));
   }
   if (allHaveCurrentData) {
     // We can make progress if we're not blocked
     mHasCurrentData = true;
   }
 }

uint32_t TrackUnionStream::AddTrack(MediaInputPort* aPort, StreamBuffer::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,
                                    MediaStreamListener::TRACK_EVENT_CREATED,
                                    *segment,
                                    aPort->GetSource(), aTrack->GetID());
    }
    segment->AppendNullData(outputStart);
    StreamBuffer::Track* track =
        &mBuffer.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<MediaStreamTrackDirectListener>& bound =
            mPendingDirectTrackListeners[i];
        if (bound.mTrackID != map->mOutputTrackID) {
            continue;
        }
        MediaStream* source = map->mInputPort->GetSource();
        map->mOwnedDirectListeners.AppendElement(bound.mListener);
        if (mDisabledTrackIDs.Contains(bound.mTrackID)) {
            bound.mListener->IncreaseDisabled();
        }
        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;
}