+private:
+ boost::shared_ptr<const Content> _content;
+ /** Frame of last thing to be emitted; only used for 3D */
+ boost::optional<Frame> _last_emitted_frame;
+ boost::optional<Eyes> _last_emitted_eyes;
+ boost::optional<dcpomatic::ContentTime> _position;
+ std::vector<Frame> _last_threed_frames;