+ static void draw_hue_bar(VFrame *frame, double t);
+ static void draw_wave(VFrame *frame, double *dp, int len,
+ int base_color, int line_color);
+ void open_render_engine(EDL *edl, int is_audio);
+ void close_render_engine();
+ void render_video(int64_t pos, VFrame *vfrm);
+ void render_audio(int64_t pos, Samples **samples, int len);
+ VFrame *get_vicon_frame();