StemRoller: desktop stem separator, Android stems player, and server daemons

- stemroller/: PySide6/QML desktop app and player for separating music into stems
- android/: Plex music player that plays per-stem mixes, with Android Auto support,
  a graphic + parametric (Equalizer APO-style) EQ, and offline downloads
- server/: stemserve (serves stems to the app) and stemd (separates the library on
  the server's GPU, with "Stem Now" priority requests)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

stemroller/player/config.py

@@ -0,0 +1,47 @@
+"""Player settings and saved state: ~/.config/stemroller/player.json."""
+
+import json
+import os
+import uuid
+
+CONFIG_DIR = os.path.join(os.environ.get("XDG_CONFIG_HOME", os.path.expanduser("~/.config")), "stemroller")
+CACHE_DIR = os.path.join(os.environ.get("XDG_CACHE_HOME", os.path.expanduser("~/.cache")), "stemroller", "player")
+PATH = os.path.join(CONFIG_DIR, "player.json")
+
+DEFAULTS = {
+    "plexUrl": "http://192.168.86.2:32400",
+    "plexToken": "",
+    "plexUser": "",
+    "musicSection": "",
+    "sectionLocations": [],
+    "stemUrl": "http://192.168.86.2:8765",
+    "stemToken": "",
+    # The unraid shares, mounted here; files play straight from them when present.
+    "stemsDir": "/var/mnt/unraid/Music/Stems",
+    "musicDir": "/var/mnt/unraid/Music/Actual music/Flacs",
+    "stemRoots": [],
+    "volume": 0.8,
+    "keepMix": False,
+    "showMixer": True,
+    "gridlines": True,
+    "zoom": 100,
+}
+
+
+def load() -> dict:
+    cfg = dict(DEFAULTS)
+    try:
+        with open(PATH) as f:
+            cfg.update(json.load(f))
+    except (OSError, ValueError):
+        pass
+    cfg.setdefault("clientId", str(uuid.uuid4()))
+    return cfg
+
+
+def save(cfg: dict):
+    os.makedirs(CONFIG_DIR, exist_ok=True)
+    tmp = PATH + ".tmp"
+    with open(tmp, "w") as f:
+        json.dump(cfg, f, indent=1)
+    os.replace(tmp, PATH)