bsnes/asnes/interface/interface.hpp

class Interface {
public:
  virtual void video_refresh(const uint16_t *data, unsigned width, unsigned height) {}
  virtual void audio_sample(uint16_t l_sample, uint16_t r_sample) {}
  virtual void input_poll() {}
  virtual int16_t input_poll(bool port, Input::Device device, unsigned index, unsigned id) { return 0; }
};