dumb matrix thing

def GetMatrix(clip, matrix=None, name='getmatrix'):

    if matrix is 2:
        matrix = None

    if matrix is not None:
        if isinstance(matrix, int):
            return matrix
        matrix = matrix.lower()
        if matrix == 'chromacl':  # Chromaticity derived non-constant luminance system
            return 12
        if matrix == 'chromancl': # Chromaticity derived constant luminance system
            return 13
        if 'u' in matrix:  # Unspecified
            return GetMatrix(clip, matrix=None)
        if 'y' in matrix:  # YCgCo
            return 8
        #if 'o' in matrix:  # opponent color space
            #return 100
        if 'r' in matrix:  # RGB
            return 0
        if 'i' in matrix:  # iCtCb
            return 14
        if 'f' in matrix:  # fcc
            return 4
        if '24' in matrix: # smpte240m
            return 7
        if '4' in matrix:  # bt470bg
            return 5
        if '6' in matrix or '1' in matrix: # 601/smpte170m
            return 6
        if '7' in matrix:  # bt709
            return 1
        if 'n' in matrix or matrix in ('2', '2020'): # 2020/bt2020nc/2020ncl
            return 9
        #if '8' in matrix or '5' in matrix: # smpte2085
            #return 11
        if '2' in matrix:  # 2020cl/bt2020c/bt2020c
            return 10
        raise ValueError(f'zzfunc.{name}: "matrix" string provided was outlandishly wrong')

    frame = clip.get_frame(0)
    _Matrix = frame.props.get('_Matrix', 0)

    if _Matrix is not 0:
        return _Matrix

    w, h = frame.width, frame.height

    if w <= 1024 and h <= 576:
        return 5
    if w <= 2048 and h <= 1536:
        return 1
    return 9