v4l2_fraction_to_interval
interval = v4l2_fraction_to_interval(timeperframe.numerator,
EXPORT_SYMBOL_GPL(v4l2_fraction_to_interval);
video->interval = v4l2_fraction_to_interval(timeperframe.numerator,
u32 v4l2_fraction_to_interval(u32 numerator, u32 denominator);