Handle multiple faces

Kinect - Handling multiple faces

private Dictionary<ulong, FaceFrameSource> _faceSources = new Dictionary<ulong, FaceFrameSource>();
        private Dictionary<ulong, FaceFrameReader> _faceReaders = new Dictionary<ulong, FaceFrameReader>();

        /// <summary>
        /// Process body frames
        /// </summary>
        private void OnBodyFrameReceived(object sender, BodyFrameArrivedEventArgs e)
        {
            // Get Frame ref
            BodyFrameReference bodyRef = e.FrameReference;

            if (bodyRef == null) return;

            // Get body frame
            using (BodyFrame frame = bodyRef.AcquireFrame())
            {
                if (frame == null) return;

                // Allocate array when required
                if (_bodies == null)
                    _bodies = new Body[frame.BodyCount];

                // Refresh bodies
                frame.GetAndRefreshBodyData(_bodies);

                foreach (Body body in _bodies)
                {
                    if (body.IsTracked && !_faceSources.ContainsKey(body.TrackingId))
                    {
                        // Create new sources with body TrackingId
                        FaceFrameSource faceSource = new FaceFrameSource(_kinect, body.TrackingId, _faceFrameFeatures);

                        // Create new reader
                        FaceFrameReader faceReader = _faceSource.OpenReader();

                        // Wire events
                        faceReader.FrameArrived += OnFaceFrameArrived;
                        faceSource.TrackingIdLost += OnTrackingIdLost;

                        // Add sources to dictionary
                        _faceSources.Add(body.TrackingId, faceSource);
                        _faceReaders.Add(body.TrackingId, faceReader);
                    }
                }
            }
        }