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stemtag.py
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stemtag.py
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#!/usr/bin/env python3
# This script lets you match a stem file with its matching master file
# and copy over the metadata from the stem file to the master file
# Installation:
# `python3 -m pip install git+https://github.com/wolkenarchitekt/traktor-nml-utils`
# `python3 -m pip install soundfile`
# `python3 -m pip install pyloudnorm`
import argparse
from traktor_nml_utils import TraktorCollection
from pathlib import Path
import soundfile as sf
import pyloudnorm as pyln
from decimal import Decimal
def main():
parser = argparse.ArgumentParser()
parser.add_argument(
"collection",
help="Path to Traktor `collection.nml` file",
default="collection.nml",
)
args = parser.parse_args()
print("Loading collection.nml...")
collection = TraktorCollection(path=Path(args.collection))
print("Loaded!")
print("Matching...")
for stem in collection.nml.collection.entry:
# Check if stem file is locked
if stem.stems and stem.lock == 1 and stem.artist and stem.title:
print(stem.location.file)
# Match stem file with regular file
for regular in collection.nml.collection.entry:
if regular.stems:
continue
if (
(
stem.artist == regular.artist
or regular.artist
and stem.artist in regular.artist
)
and stem.title == regular.title
) or (
stem.location.file.removesuffix(".stem.m4a")
== regular.location.file.removesuffix(".wav")
or stem.location.file.removesuffix(".stem.m4a")
== regular.location.file.removesuffix(".wave")
or stem.location.file.removesuffix(".stem.m4a")
== regular.location.file.removesuffix(".aif")
or stem.location.file.removesuffix(".stem.m4a")
== regular.location.file.removesuffix(".aiff")
or stem.location.file.removesuffix(".stem.m4a")
== regular.location.file.removesuffix(".flac")
or stem.location.file.removesuffix(".stem.m4a")
== regular.location.file.removesuffix(".mp3")
or stem.location.file.removesuffix(".stem.mp4")
== regular.location.file.removesuffix(".wav")
or stem.location.file.removesuffix(".stem.mp4")
== regular.location.file.removesuffix(".wave")
or stem.location.file.removesuffix(".stem.mp4")
== regular.location.file.removesuffix(".aif")
or stem.location.file.removesuffix(".stem.mp4")
== regular.location.file.removesuffix(".aiff")
or stem.location.file.removesuffix(".stem.mp4")
== regular.location.file.removesuffix(".flac")
or stem.location.file.removesuffix(".stem.mp4")
== regular.location.file.removesuffix(".mp3")
):
print("--> " + regular.location.file)
# Write the integrated LUFS to "Comment 2" (info.rating)
if (
regular.info.rating is None
or not regular.info.rating.startswith("LUFS:")
):
# TODO: Windows path support
stem_file_path = (
"/Volumes/"
+ stem.location.volume
+ stem.location.dir.replace(":", "")
+ stem.location.file
)
regular_file_path = (
"/Volumes/"
+ regular.location.volume
+ regular.location.dir.replace(":", "")
+ regular.location.file
)
try:
# Load audio (with shape (samples, channels))
data, rate = sf.read(regular_file_path)
# Create BS.1770 meter
meter = pyln.Meter(rate)
# Measure loudness
loudness = meter.integrated_loudness(data)
lufs = "LUFS: " + str(
Decimal(str(loudness)).quantize(Decimal("1.00"))
)
print(lufs)
regular.info.rating = lufs # comment2
stem.info.rating = lufs # comment2
except Exception as e:
print(e)
# Write the open key to "Key Text" (info.key)
musical_key_to_open_key = {
21: "1m",
16: "2m",
23: "3m",
18: "4m",
13: "5m",
20: "6m",
15: "7m",
22: "8m",
17: "9m",
12: "10m",
19: "11m",
14: "12m",
0: "1d",
7: "2d",
2: "3d",
9: "4d",
4: "5d",
11: "6d",
6: "7d",
1: "8d",
8: "9d",
3: "10d",
10: "11d",
5: "12d",
}
open_key = musical_key_to_open_key[stem.musical_key.value_attribute]
regular.info.key = open_key
stem.info.key = open_key
# Copy from stem file to regular file
if stem.cue_v2:
regular.cue_v2 = stem.cue_v2
if stem.title:
regular.title = stem.title
if stem.artist:
regular.artist = stem.artist
if stem.album:
regular.album = stem.album
if stem.tempo:
regular.tempo = stem.tempo
if stem.musical_key:
regular.musical_key = stem.musical_key
if stem.info.color:
regular.info.color = stem.info.color
if stem.info.genre:
regular.info.genre = stem.info.genre
if stem.info.label:
regular.info.label = stem.info.label
if stem.info.playcount:
regular.info.playcount = stem.info.playcount
if stem.info.last_played:
regular.info.last_played = stem.info.last_played
if stem.info.comment:
regular.info.comment = stem.info.comment
regular.lock = 1
regular.lock_modification_time = stem.lock_modification_time
print("OK")
break
print("\n")
print("Done.")
print("Saving...")
collection.save()
print("Done.")
if __name__ == "__main__":
main()