ar_stuff.py

# in vstools now, gist no longer useful

import vapoursynth as vs
from math import gcd


def get_dar(width: int, height: int) -> tuple:
    dar = gcd(width, height)
    return (width // dar, height // dar)


def get_sar(dar: tuple, height: int, active_area: int) -> tuple:
    sar = dar[0] * height, dar[1] * active_area
    sargcd = gcd(sar[0], sar[1])
    return (sar[0] // sargcd, sar[1] // sargcd)


def sar_to_props(clip: vs.VideoNode, sar: tuple) -> vs.VideoNode:
    clip = clip.std.SetFrameProps(_SARDen=sar[0], _SARNum=sar[1])
    return clip