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app.py

@@ -19,6 +19,43 @@ from __future__ import annotations
 import spaces  # noqa: F401  (must come before torch; see module docstring)
 
 import os
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+SF2 = os.path.join(HERE, "sf", "FluidR3_GM.sf2")
+SR = 44100
+
+
+def _preseed_partitura_soundfont() -> None:
+    """Stop partitura from FTP-downloading a soundfont at import time.
+
+    partitura's top-level ``__init__`` imports its audio-export module, which -
+    when fluidsynth is importable and its bundled asset is missing - fetches a
+    MuseScore soundfont over FTP. HF Spaces block FTP egress, so that call hangs
+    and the app crashes on ``import partitura``. Pre-seed the asset (symlink our
+    bundled GM soundfont) so partitura finds it and skips the download. Must run
+    BEFORE ``import partitura``.
+    """
+    import importlib.util
+
+    spec = importlib.util.find_spec("partitura")  # locate without importing
+    if not spec or not spec.origin:
+        return
+    assets = os.path.join(os.path.dirname(spec.origin), "assets")
+    target = os.path.join(assets, "MuseScore_General.sf3")
+    if os.path.exists(target):
+        return
+    try:
+        os.makedirs(assets, exist_ok=True)
+        if os.path.exists(SF2):
+            os.symlink(SF2, target)
+        else:
+            open(target, "wb").close()  # placeholder; partitura's synth is unused
+    except OSError:
+        pass
+
+
+_preseed_partitura_soundfont()
+
 import tempfile
 
 import matplotlib
@@ -31,10 +68,6 @@ import partitura
 from drum_dynamics.serve.models import Engine
 from drum_dynamics.viz.playback import set_soundfont, _ensure_fluidsynth_discoverable
 
-HERE = os.path.dirname(os.path.abspath(__file__))
-SF2 = os.path.join(HERE, "sf", "FluidR3_GM.sf2")
-SR = 44100
-
 # --- load once at module scope ------------------------------------------------
 ENGINE = Engine.load(os.path.join(HERE, "models"))
 LEVELS = ENGINE.levels()