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4re/nnedi3_rpow2.py

Last active Dec 1, 2020
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from vapoursynth import core
__version__ = "1.1.0"
def nnedi3_rpow2(clip, rfactor=2, width=None, height=None, correct_shift=True,
kernel="spline36", nsize=0, nns=3, qual=None, etype=None, pscrn=None,
opt=True, int16_prescreener=None, int16_predictor=None, exp=None, upsizer=None):
"""nnedi3_rpow2 is for enlarging images by powers of 2.
Args:
rfactor (int): Image enlargement factor.
Must be a power of 2 in the range [2 to 1024].
correct_shift (bool): If False, the shift is not corrected.
The correction is accomplished by using the subpixel
cropping capability of fmtc's resizers.
width (int): If correcting the image center shift by using the
"correct_shift" parameter, width/height allow you to set a
new output resolution.
kernel (string): Sets the resizer used for correcting the image
center shift that nnedi3_rpow2 introduces. This can be any of
fmtc kernels, such as "cubic", "spline36", etc.
spline36 is the default one.
nnedi3_args (mixed): For help with nnedi3 args
refert to nnedi3 documentation.
upsizer (string): Which implementation to use: nnedi3, znedi3 or nnedi3cl.
If not selected the fastest available one will be chosen.
"""
if width is None:
width = clip.width * rfactor
if height is None:
height = clip.height * rfactor
hshift = 0.0
vshift = -0.5
pkdnnedi = dict(
dh=True,
nsize=nsize,
nns=nns,
qual=qual,
etype=etype,
pscrn=pscrn,
)
pkdchroma = dict(kernel=kernel, sy=-0.5, planes=[2, 3, 3])
tmp = 1
times = 0
while tmp < rfactor:
tmp *= 2
times += 1
if rfactor < 2 or rfactor > 1024:
raise ValueError("nnedi3_rpow2: rfactor must be between 2 and 1024.")
if tmp != rfactor:
raise ValueError("nnedi3_rpow2: rfactor must be a power of 2.")
if hasattr(core, "nnedi3cl") is True and (upsizer is None or upsizer == "nnedi3cl"):
nnedi3 = core.nnedi3cl.NNEDI3CL
elif hasattr(core, "znedi3") is True and (upsizer is None or upsizer == "znedi3"):
nnedi3 = core.znedi3.nnedi3
pkdnnedi.update(
opt=opt,
int16_prescreener=int16_prescreener,
int16_predictor=int16_predictor,
exp=exp,
)
elif hasattr(core, "nnedi3") is True and (upsizer is None or upsizer == "nnedi3"):
nnedi3 = core.nnedi3.nnedi3
pkdnnedi.update(
opt=opt,
int16_prescreener=int16_prescreener,
int16_predictor=int16_predictor,
exp=exp,
)
else:
if upsizer is not None:
print(f"nnedi3_rpow2: You chose \"{upsizer}\" but it cannot be found.")
raise RuntimeError("nnedi3_rpow2: nnedi3/znedi3/nnedi3cl plugin is required.")
if correct_shift or clip.format.subsampling_h:
if hasattr(core, "fmtc") is not True:
raise RuntimeError("nnedi3_rpow2: fmtconv plugin is required.")
last = clip
for i in range(times):
field = 1 if i == 0 else 0
last = nnedi3(last, field=field, **pkdnnedi)
last = core.std.Transpose(last)
if last.format.subsampling_w:
# Apparently always using field=1 for the horizontal pass somehow
# keeps luma/chroma alignment.
field = 1
hshift = hshift * 2 - 0.5
else:
hshift = -0.5
last = nnedi3(last, field=field, **pkdnnedi)
last = core.std.Transpose(last)
if clip.format.subsampling_h:
last = core.fmtc.resample(last, w=last.width, h=last.height, **pkdchroma)
if correct_shift is True:
last = core.fmtc.resample(last, w=width, h=height, kernel=kernel, sx=hshift, sy=vshift)
if last.format.id != clip.format.id:
last = core.fmtc.bitdepth(last, csp=clip.format.id)
return last
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