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import argparse
import subprocess
from pathlib import Path
from typing import Iterator
from tqdm import tqdm
import syncedlyrics
from mutagen.flac import FLAC
import ffmpeg
def iter_files(base: Path) -> Iterator[Path]:
iterator = base.rglob("*")
for p in iterator:
if p.is_file():
yield p.resolve()
def rename_file(filepath: Path, new_name: str) -> None:
target = filepath.with_name(new_name)
filepath.rename(target)
def get_audio_issues(path: Path) -> dict:
audio = FLAC(str(path))
info = audio.info
sample_rate = getattr(info, "sample_rate", 0)
bits_per_sample = getattr(info, "bits_per_sample", 24)
max_blocksize = getattr(info, "max_blocksize", 4096)
return {
"needs_sample_rate_fix": sample_rate > 192000,
"needs_bitdepth_fix": bits_per_sample > 24,
"needs_blocksize_fix": max_blocksize != 4096,
"sample_rate": sample_rate,
"bits_per_sample": bits_per_sample,
"max_blocksize": max_blocksize,
}
def fix_with_ffmpeg(path: Path, fix_sample_rate: bool, fix_bitdepth: bool) -> Path:
output_kwargs = {
"acodec": "flac",
"map": "0:a",
}
if fix_bitdepth:
output_kwargs["sample_fmt"] = "s24"
if fix_sample_rate:
output_kwargs["ar"] = "192000"
temp_path = path.with_suffix(".tmp.flac")
(
ffmpeg
.input(str(path))
.output(str(temp_path), **output_kwargs)
.overwrite_output()
.run(quiet=True)
)
path.unlink()
temp_path.rename(path)
return path
def fix_blocksize(path: Path, blocksize: int = 4096) -> Path:
temp_path = path.with_suffix(".tmp.flac")
command = ["flac", "--force", f"--blocksize={blocksize}", str(path), "-o", str(temp_path)]
try:
subprocess.run(command, capture_output=True, text=True, check=True)
path.unlink()
temp_path.rename(path)
except subprocess.CalledProcessError as e:
temp_path.unlink(missing_ok=True)
print(f" Error fixing blocksize for {path.name}:")
print(e.stderr)
return path
def get_track_info(path: Path) -> tuple:
audio = FLAC(str(path))
title = audio.get("TITLE", [""])
artist = audio.get("ARTIST", [""])
return (title[0], artist[0])
def resize_album_art(path: Path) -> None:
audio = FLAC(str(path))
if not audio.pictures:
return
from io import BytesIO
from PIL import Image
for pic in audio.pictures:
with Image.open(BytesIO(pic.data)) as img:
resized = img.resize((500, 500), Image.Resampling.LANCZOS)
out = BytesIO()
fmt = img.format if img.format else "PNG"
resized.save(out, format=fmt)
pic.data = out.getvalue()
audio.save()
def sanitize_filename(name: str) -> str:
illegal = r'\/:*?"<>|'
return "".join(c for c in name if c not in illegal).strip()
def main():
parser = argparse.ArgumentParser()
parser.add_argument("base_dir", type=Path)
parser.add_argument("--nolrc", "-n", action="store_true", dest="nolrc")
args = parser.parse_args()
base = args.base_dir
files = [p for p in iter_files(base) if p.suffix == ".flac"]
for fp in tqdm(files, desc="Processing FLAC files", unit="file"):
print(f"\nProcessing: {fp.name}")
title, artist = get_track_info(fp)
if not title:
print(f" Warning: TITLE tag is empty, using filename as title")
title = fp.stem
artist = "UNKNOWN ARTIST"
new_file_name = sanitize_filename(f"{title} - {artist}") + ".flac"
if new_file_name != fp.name:
rename_file(fp, new_file_name)
fp = fp.with_name(new_file_name)
issues = get_audio_issues(fp)
print(f" Stats: {issues['sample_rate']}Hz, {issues['bits_per_sample']}-bit, blocksize={issues['max_blocksize']}")
if issues["needs_sample_rate_fix"] or issues["needs_bitdepth_fix"]:
reasons = []
if issues["needs_sample_rate_fix"]:
reasons.append(f"sample rate {issues['sample_rate']}Hz -> 192000Hz")
if issues["needs_bitdepth_fix"]:
reasons.append(f"bit depth {issues['bits_per_sample']}-bit -> 24-bit")
print(f" Fixing via ffmpeg: {', '.join(reasons)}")
fp = fix_with_ffmpeg(fp, issues["needs_sample_rate_fix"], issues["needs_bitdepth_fix"])
post_info = FLAC(str(fp)).info
if getattr(post_info, "max_blocksize", 4096) != 4096:
issues["needs_blocksize_fix"] = True
if issues["needs_blocksize_fix"]:
print(f" Fixing blocksize -> 4096 via flac CLI")
fp = fix_blocksize(fp)
print(" Resizing album art to 500x500")
resize_album_art(fp)
if args.nolrc:
continue
if not title or not artist:
print(f" Skipping LRC for {fp.name} (missing title or artist tag)")
continue
lrc_path = fp.with_suffix(".lrc")
if lrc_path.exists():
print(f" Skipping LRC for {fp.name} (already exists)")
continue
print(f" Fetching LRC for: {title} - {artist}")
lrc = syncedlyrics.search(f"{title} {artist}", providers=["Lrclib", "Megalobiz", "NetEase"])
with open(lrc_path, "w", encoding="utf-8") as f:
f.write(lrc if lrc else "")
if __name__ == "__main__":
main()
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