pub unsafe extern "C" fn av_d2q(d: f64, max: c_int) -> AVRational展开描述
Convert a double precision floating point number to a rational.
In case of infinity, the returned value is expressed as {1, 0} or
{-1, 0} depending on the sign.
In general rational numbers with |num| <= 1<<26 && |den| <= 1<<26 can be recovered exactly from their double representation. (no exceptions were found within 1B random ones)
@param d double to convert
@param max Maximum allowed numerator and denominator
@return d in AVRational form
@see av_q2d()