65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
"""
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pianoplayer service: annotate MusicXML with fingering (Parncutt algorithm).
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Uses the pianoplayer v3 API (run_annotate) which handles part routing and
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hand assignment internally.
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"""
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import asyncio
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import os
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import tempfile
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from pathlib import Path
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# Configurable via env var; default 120 s is generous for complex scores.
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_FINGERING_TIMEOUT = int(os.environ.get("FINGERING_TIMEOUT_S", "120"))
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async def annotate_fingering(musicxml: str) -> str:
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"""Add finger annotations to MusicXML using the pianoplayer library."""
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try:
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return await asyncio.wait_for(
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asyncio.get_running_loop().run_in_executor(None, _annotate, musicxml),
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timeout=_FINGERING_TIMEOUT,
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)
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except asyncio.TimeoutError:
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raise RuntimeError(
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"Fingering generation timed out. "
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"Try a shorter score or increase FINGERING_TIMEOUT_S."
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)
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def _annotate(musicxml: str) -> str:
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import io
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import contextlib
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from pianoplayer.core import run_annotate
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xml_path = None
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out_path = None
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try:
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with tempfile.NamedTemporaryFile(
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suffix=".xml", delete=False, mode="w", encoding="utf-8"
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) as f:
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f.write(musicxml)
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xml_path = f.name
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out_tmp = tempfile.NamedTemporaryFile(suffix=".xml", delete=False)
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out_tmp.close()
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out_path = out_tmp.name
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# Suppress Rich progress/summary output so server logs stay clean.
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with contextlib.redirect_stdout(io.StringIO()), contextlib.redirect_stderr(io.StringIO()):
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run_annotate(
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xml_path,
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outputfile=out_path,
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n_measures=1000,
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auto_routing=True, # let pianoplayer detect which part is L/R
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quiet=True,
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)
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return Path(out_path).read_text(encoding="utf-8")
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finally:
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if xml_path:
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Path(xml_path).unlink(missing_ok=True)
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if out_path:
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Path(out_path).unlink(missing_ok=True)
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