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#!/usr/bin/env python3
"""Pack FLAC tracks into N audio CDs, shuffled and deduplicated by title.
Reads a JSON config from stdin or from --config FILE:
{
"music_root": "/data/nfs/k3svolumes/navidrome/music",
"dest": "/home/paul/Desktop/Music",
"name_prefix": "CD", # output dirs become CD1-Mix, CD2-Mix, ...
"name_suffix": "Mix",
"title": "Focus / House Mix",
"num_cds": 3,
"max_seconds": 4380, # 73:00 — safe under 74-min CD limit
"seed": 42,
"source_dirs": [
"Miscellaneous/Compilations/Deep House Study Mix_ Electronic Music for Studying, Concentration",
"Miscellaneous/Compilations/Chill House Cafe Playlist"
],
"extra_files": [
"Miscellaneous/David Guetta, Marten Hørger/The Freaks/01 The Freaks (Edit).flac"
],
"exclude_titles": ["Eternal", "Tunnel"], # optional: skip these (case-insensitive)
"recursive": false, # optional: glob *.flac recursively
"start_index": 1 # optional: start CD numbering (e.g. 2)
}
Disc-length presets (max_seconds):
74-min CD: 4380 (73:00, ~1 min headroom)
80-min CD: 4700 (78:20, ~1:40 headroom)
Output per CD:
<dest>/<name_prefix><N>-<name_suffix>/01 - Title.flac ...
<dest>/<name_prefix><N>-<name_suffix>.txt (summary)
"""
import argparse
import json
import random
import shutil
import subprocess
import sys
from pathlib import Path
def duration(p: Path) -> float:
out = subprocess.check_output(
["ffprobe", "-v", "error",
"-show_entries", "format=duration",
"-of", "default=nw=1:nk=1", str(p)],
text=True,
)
return float(out.strip())
def mmss(secs: float) -> str:
m, s = divmod(int(round(secs)), 60)
return f"{m}:{s:02d}"
def clean_title(stem: str) -> str:
"""Strip a leading 'NN ' track-number prefix."""
if len(stem) > 3 and stem[:2].isdigit() and stem[2] == " ":
return stem[3:].strip()
return stem.strip()
def collect_pool(cfg: dict) -> list[dict]:
music_root = Path(cfg["music_root"])
recursive = bool(cfg.get("recursive", False))
glob_pat = "**/*.flac" if recursive else "*.flac"
paths: list[Path] = []
for d in cfg.get("source_dirs", []):
base = music_root / d
if base.exists():
paths.extend(sorted(base.glob(glob_pat)))
for f in cfg.get("extra_files", []):
p = music_root / f
if p.exists():
paths.append(p)
excluded = {t.lower().strip() for t in cfg.get("exclude_titles", [])}
seen: set[str] = set()
pool: list[dict] = []
for flac in paths:
title = clean_title(flac.stem)
key = title.lower()
if key in seen or key in excluded:
continue
seen.add(key)
pool.append({
"path": flac,
"title": title,
"source": flac.parent.name,
"duration": duration(flac),
})
return pool
def pack(pool: list[dict], num_cds: int, max_seconds: int):
"""Greedy fit into least-filled CD that still has room."""
cds: list[list[dict]] = [[] for _ in range(num_cds)]
totals = [0.0] * num_cds
leftover: list[dict] = []
for tr in pool:
placed = False
for i in sorted(range(num_cds), key=lambda x: totals[x]):
if totals[i] + tr["duration"] <= max_seconds:
cds[i].append(tr)
totals[i] += tr["duration"]
placed = True
break
if not placed:
leftover.append(tr)
return cds, totals, leftover
def write_cd(idx: int, tracks: list[dict], total: float, cfg: dict) -> None:
dest = Path(cfg["dest"])
prefix = cfg.get("name_prefix", "CD")
suffix = cfg.get("name_suffix", "Mix")
title = cfg.get("title", "Mix")
max_s = cfg["max_seconds"]
start = int(cfg.get("start_index", 1))
name = f"{prefix}{idx + start}-{suffix}"
out_dir = dest / name
out_dir.mkdir(parents=True, exist_ok=True)
summary = [
f"CD {idx + start} — {title}",
f"Total tracks: {len(tracks)}",
f"Total time: {mmss(total)} (limit {mmss(max_s)})",
"",
f"{'#':>2} {'TIME':>5} TITLE [source]",
"-" * 78,
]
for i, tr in enumerate(tracks, 1):
num = f"{i:02d}"
dest_name = f"{num} - {tr['title']}.flac".replace("/", "_")
shutil.copy2(tr["path"], out_dir / dest_name)
summary.append(
f"{num} {mmss(tr['duration']):>5} {tr['title']} [{tr['source']}]"
)
(dest / f"{name}.txt").write_text("\n".join(summary) + "\n", encoding="utf-8")
print(f" -> {name}: {len(tracks)} tracks, {mmss(total)}")
def main() -> None:
ap = argparse.ArgumentParser(description=__doc__)
ap.add_argument("--config", "-c", help="JSON config file (default: stdin)")
args = ap.parse_args()
raw = Path(args.config).read_text() if args.config else sys.stdin.read()
cfg = json.loads(raw)
cfg.setdefault("num_cds", 3)
cfg.setdefault("max_seconds", 4380)
cfg.setdefault("seed", 42)
cfg.setdefault("title", "Mix")
random.seed(cfg["seed"])
Path(cfg["dest"]).mkdir(parents=True, exist_ok=True)
pool = collect_pool(cfg)
print(f"pool: {len(pool)} tracks, "
f"{mmss(sum(t['duration'] for t in pool))} total")
random.shuffle(pool)
cds, totals, leftover = pack(pool, cfg["num_cds"], cfg["max_seconds"])
if leftover:
print(f" leftover (did not fit): {len(leftover)}")
for i, (tracks, total) in enumerate(zip(cds, totals)):
write_cd(i, tracks, total, cfg)
if __name__ == "__main__":
main()
|
