configs/music-normalize/main.py

263 lines
7.4 KiB
Python
Executable File

#!/usr/bin/env python3
# ffmpeg wrapper
import multiprocessing
from os.path import isdir, isfile
import ffmpy
# argument parsing
import argparse
# multiprocessing stuff
from multiprocessing import Pool
from multiprocessing import cpu_count
# executing some commands
import subprocess
# parsing json output of loudnorm
import json
# file/directory handling
import os
# most recent starttime for program
import time
from random import randint
"""
"""
# FIXME
# inputfile = (
# '/home/marc/Downloads/FalKKonE - 01 Aria (From "Berserk: The Golden Age Arc").flac'
# )
# inputfile = "/home/marc/Downloads/test441.opus"
# outputfile = "/home/marc/Downloads/test441_out.opus"
# srcfolder = "/home/marc/Downloads/MusikRaw"
# destfolder = "/home/marc/Downloads/Musik"
musicfile_extensions = (".flac", ".wav", ".mp3", ".m4a", ".aac", ".opus")
def get_format(inputfile) -> str:
# get codec format
# https://stackoverflow.com/a/29610897
# this shows the codecs of all audio streams present in the file, which shouldn't matter unless you have more than one stream
ff = ffmpy.FFprobe(
inputs={inputfile: None},
global_options=(
"-v quiet",
"-select_streams a",
"-show_entries stream=codec_name",
"-of default=noprint_wrappers=1:nokey=1",
),
)
# print(ff.cmd)
proc = subprocess.Popen(ff.cmd, shell=True, stdout=subprocess.PIPE)
# NOTE read output from previous command
# rstrip: remove trailing newline
# decode: convert from binary string to normal string
format: str = (
proc.stdout.read() # pyright: ignore[reportOptionalMemberAccess]
.rstrip()
.decode("utf8")
)
# print(format)
return format
def remove_picture(inputfile):
"""
This function makes sure no image is attached to the audio stream.
An image might cause problems for the later conversion to opus.
Parameters:
inputfile (str): Path to file
"""
tmpfile = os.path.splitext(inputfile)[0] + ".tmp" + os.path.splitext(inputfile)[1]
ff = ffmpy.FFmpeg(
inputs={inputfile: None},
outputs={tmpfile: "-vn -c:a copy"},
global_options=("-v error"),
)
ff.run()
os.remove(inputfile)
os.rename(tmpfile, inputfile)
def loudness_info(inputfile) -> dict[str, str]:
print("Measuring loudness of ", os.path.basename(inputfile))
# get format from file
# inputformat = get_format(inputfile)
# NOTE format is actually unnecessary here
ff = ffmpy.FFmpeg(
inputs={inputfile: None},
outputs={"/dev/null": "-pass 1 -filter:a loudnorm=print_format=json -f null"},
global_options=("-y"),
)
# print(ff.cmd)
proc = subprocess.Popen(
ff.cmd, shell=True, stderr=subprocess.STDOUT, stdout=subprocess.PIPE
)
# NOTE get loudness info from subprocess
# rstrip: remove trailing newline
# decode: convert from binary string to utf8
# splitlines: list of lines (only 12 last ones, length of the output json)
# join: reassembles the list of lines and separates with "\n"
loudness_json: str = "\n".join(
proc.stdout.read().rstrip().decode("utf8").splitlines()[-12:]
)
# decode json to dict
loudness: dict[str, str] = json.loads(loudness_json)
# print(loudness_json)
# print(ff.cmd)
return loudness
def convert(inputfile, outputfile, loudness):
print("Working on ", os.path.basename(inputfile))
# coverpath = os.path.join(os.path.dirname(inputfile), "cover.jpg")
# NOTE including covers into ogg/opus containers currently doesn't work
# https://trac.ffmpeg.org/ticket/4448
inputcmd = {inputfile: None}
outputcmd = {
outputfile: "-pass 2"
" "
"-filter:a"
" "
"loudnorm=I=-30.0:"
"measured_I={input_i}:"
"measured_LRA={input_lra}:"
"measured_tp={input_tp}:measured_thresh={input_thresh}"
" "
"-c:a libopus"
" "
"-b:a 320k".format(
input_i=loudness["input_i"],
input_lra=loudness["input_lra"],
input_tp=loudness["input_tp"],
input_thresh=loudness["input_thresh"],
)
}
ff = ffmpy.FFmpeg(
inputs=inputcmd,
outputs=outputcmd,
global_options=("-y", "-v error"),
)
# print(ff.cmd)
ff.run()
def main(inputfile: str):
"""
Main program loop
Parameters:
inputfile (str): Path to input file
"""
# set output folder to parent path + "normalized"
outputfolder = os.path.join(os.path.dirname(inputfile), "normalized")
# NOTE create output folder
# because multiple parallel processes are at work here,
# there might be conflicts with one trying to create the directory although it already exists
# this while loop makes sure the directory does exist
# the try/except block ensures the error is caught and (hopefully) doesn't happen again just after with random sleep
# there's very likely a better way to do this, idk
while not os.path.isdir(outputfolder):
try:
os.mkdir(outputfolder)
except:
time.sleep(randint(0, 4))
# output file path
noext_infile: str = os.path.splitext(os.path.basename(inputfile))[0]
outputfile: str = os.path.join(outputfolder, noext_infile + ".opus")
# print(inputfile)
# print(os.path.dirname(inputfile))
# print(os.path.basename(inputfile))
# print(outputfile)
# remove_picture(inputfile=inputfile)
loudness = loudness_info(inputfile=inputfile)
convert(inputfile=inputfile, outputfile=outputfile, loudness=loudness)
if __name__ == "__main__":
# start time of program
starttime = time.time()
parser = argparse.ArgumentParser(description="")
# Input directory
parser.add_argument(
"-i", "--input-dir", required=True, type=str, help="Input source directory"
)
# number of cpus/threads to use, defaults to all available
parser.add_argument(
"-c",
"--cpu-count",
required=False,
type=int,
help="Number of cpu cores",
default=multiprocessing.cpu_count(),
)
# in case you wanted to rerun the conversion for everything
parser.add_argument(
"-r",
"--reset",
required=False,
action="store_true",
help="Rerun conversion for all files",
)
args = parser.parse_args()
srcfolder = args.input_dir
cpu = args.cpu_count
reset = args.reset
# file where last run timestamp is stored
timefile = os.path.join(srcfolder, "run.time")
# get time of previous run
if reset:
timeprev = 0
elif os.path.isfile(timefile):
with open(timefile, "r") as file:
timeprev = file.read()
else:
timeprev = 0
# print(timeprev)
musicfiles = []
for root, dirs, files in os.walk(srcfolder):
# ignore the "normalized" subfolder
dirs[:] = [d for d in dirs if d not in ["normalized"]]
for file in files:
if file.endswith(musicfile_extensions):
filepath = os.path.join(root, file)
# only file newer than the last run are added
if os.path.getmtime(filepath) >= float(timeprev):
musicfiles.append(os.path.join(root, file))
# print(musicfiles)
with Pool(cpu) as p:
p.map(main, musicfiles)
# write this run's time into file
with open(timefile, "w") as file:
file.write(str(starttime))