set_input
.set_input = auvitek_set_input,
if (hw->set_input == NULL) {
return hw->set_input(sc->hw_softc, &vi);
int (*set_input)(void *, struct video_input *);
extern void set_input(struct input_file *, FILE *, const char *);
set_input(i, f, path);
set_input(i, f, filename);
set_input(infile+0, stdin, "stdin");
set_input(infile, stdin, "stdin");