VBI_OPEN
if ( (bktr->vbiflags & VBI_OPEN)
if ((bktr->vbiflags & (VBI_CAPTURE|VBI_OPEN)) ==
(VBI_CAPTURE|VBI_OPEN) && (field == EVEN_F)) {
if (bktr->vbiflags & VBI_OPEN) /* device is busy */
bktr->vbiflags |= VBI_OPEN;
bktr->vbiflags &= ~VBI_OPEN;