/* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */
/*#[macro_export]
macro_rules! ceil_rshift {
($a:expr, $b:expr) => {
//$a / ($a << $b)
$a >> $b
//-((-($a)) >> ($b))
};
}*/
//#define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) : ((a) + (1<<(b)) - 1) >> (b))
//fn ceil_rshift(a: usize, b: u8) -> usize {
// a / (a << b)