Implement based on(add|remove)track via NotifierObserver about cordova-plugin-iosrtc HOT 2 CLOSED

void MediaStreamSignaling::OnRemoteTrackSeen(const std::string& stream_label,
                                             const std::string& track_id,
                                             uint32 ssrc,
                                             cricket::MediaType media_type) {
  MediaStreamInterface* stream = remote_streams_->find(stream_label);

  if (media_type == cricket::MEDIA_TYPE_AUDIO) {
    AudioTrackInterface* audio_track =
        remote_stream_factory_->AddAudioTrack(stream, track_id);
    stream_observer_->OnAddRemoteAudioTrack(stream, audio_track, ssrc);
  } else if (media_type == cricket::MEDIA_TYPE_VIDEO) {
    VideoTrackInterface* video_track =
        remote_stream_factory_->AddVideoTrack(stream, track_id);
    stream_observer_->OnAddRemoteVideoTrack(stream, video_track, ssrc);
  } else {
    ASSERT(false && "Invalid media type");
  }
}

  template <typename TI, typename T, typename TP, typename S>
  TI* AddTrack(MediaStreamInterface* stream, const std::string& track_id,
               S* source) {
    rtc::scoped_refptr<TI> track(
        TP::Create(signaling_thread_, T::Create(track_id, source)));
    track->set_state(webrtc::MediaStreamTrackInterface::kLive);
    if (stream->AddTrack(track)) {
      return track;
    }
    return NULL;
  }

template <typename TrackVector, typename Track>
bool MediaStream::AddTrack(TrackVector* tracks, Track* track) {
  typename TrackVector::iterator it = FindTrack(tracks, track->id());
  if (it != tracks->end())
    return false;
  tracks->push_back(track);
  FireOnChanged();
  return true;
}