contour.py
python
sha256:d11a87833d5fad6059b7662844bf5448a8911a17cce7a51811f71ad394f248eb
bump to v0.2.0rc13
Human
patch
7 days ago
| 1 | """muse contour — melodic contour analysis for a MIDI track. |
| 2 | |
| 3 | Classifies the overall melodic shape (arch, ascending, wave, …), computes |
| 4 | the pitch range, counts direction changes, and shows the full interval |
| 5 | sequence. Agents use contour to compare melodic variation across branches |
| 6 | without listening to audio. |
| 7 | |
| 8 | Usage:: |
| 9 | |
| 10 | muse contour tracks/melody.mid |
| 11 | muse contour tracks/lead.mid --commit HEAD~1 |
| 12 | muse contour tracks/violin.mid --json |
| 13 | |
| 14 | Output:: |
| 15 | |
| 16 | Melodic contour: tracks/melody.mid — working tree |
| 17 | Shape: arch |
| 18 | Pitch range: E3 – C6 (32 semitones) |
| 19 | Direction changes: 7 |
| 20 | Avg interval size: 2.14 semitones |
| 21 | |
| 22 | Interval sequence (semitones): |
| 23 | +2 +2 +3 +2 -1 -2 -2 +4 -3 -2 -1 +1 ... |
| 24 | """ |
| 25 | |
| 26 | import argparse |
| 27 | import json |
| 28 | import logging |
| 29 | import pathlib |
| 30 | import sys |
| 31 | |
| 32 | from muse.core.errors import ExitCode |
| 33 | from muse.core.repo import require_repo |
| 34 | from muse.core.refs import read_current_branch |
| 35 | from muse.core.commits import resolve_commit_ref |
| 36 | from muse.plugins.midi._analysis import analyze_contour |
| 37 | from muse.plugins.midi._query import load_track, load_track_from_workdir |
| 38 | |
| 39 | logger = logging.getLogger(__name__) |
| 40 | |
| 41 | def _read_branch(root: pathlib.Path) -> str: |
| 42 | return read_current_branch(root) |
| 43 | |
| 44 | def register(subparsers: "argparse._SubParsersAction[argparse.ArgumentParser]") -> None: |
| 45 | """Register the contour subcommand.""" |
| 46 | parser = subparsers.add_parser("contour", help="Analyse the melodic contour (shape) of a MIDI track.", description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter) |
| 47 | parser.add_argument("track", metavar="TRACK", help="Workspace-relative path to a .mid file.") |
| 48 | parser.add_argument("--commit", "-c", metavar="REF", default=None, dest="ref", help="Analyse a historical snapshot instead of the working tree.") |
| 49 | parser.add_argument("--json", action="store_true", dest="as_json", help="Emit results as JSON.") |
| 50 | parser.set_defaults(func=run) |
| 51 | |
| 52 | def run(args: argparse.Namespace) -> None: |
| 53 | """Analyse the melodic contour (shape) of a MIDI track. |
| 54 | |
| 55 | ``muse contour`` classifies the overall pitch trajectory — ascending, |
| 56 | descending, arch, valley, wave, or flat — and reports pitch range, |
| 57 | interval sequence, and directional complexity. |
| 58 | |
| 59 | For agents: contour is a fast structural fingerprint. Use it to detect |
| 60 | when a branch has inadvertently flattened or inverted a melody, or to |
| 61 | verify that a transposition preserved the intended shape. |
| 62 | """ |
| 63 | track: str = args.track |
| 64 | ref: str | None = args.ref |
| 65 | as_json: bool = args.as_json |
| 66 | |
| 67 | root = require_repo() |
| 68 | commit_label = "working tree" |
| 69 | |
| 70 | if ref is not None: |
| 71 | branch = _read_branch(root) |
| 72 | commit = resolve_commit_ref(root, branch, ref) |
| 73 | if commit is None: |
| 74 | print(f"❌ Commit '{ref}' not found.", file=sys.stderr) |
| 75 | raise SystemExit(ExitCode.USER_ERROR) |
| 76 | result = load_track(root, commit.commit_id, track) |
| 77 | commit_label = commit.commit_id |
| 78 | else: |
| 79 | result = load_track_from_workdir(root, track) |
| 80 | |
| 81 | if result is None: |
| 82 | print(f"❌ Track '{track}' not found or not a valid MIDI file.", file=sys.stderr) |
| 83 | raise SystemExit(ExitCode.USER_ERROR) |
| 84 | |
| 85 | notes, _tpb = result |
| 86 | if not notes: |
| 87 | print(f" (no notes found in '{track}')") |
| 88 | return |
| 89 | |
| 90 | analysis = analyze_contour(notes) |
| 91 | |
| 92 | if as_json: |
| 93 | print(json.dumps({"track": track, "commit": commit_label, **analysis})) |
| 94 | return |
| 95 | |
| 96 | print(f"\nMelodic contour: {track} — {commit_label}") |
| 97 | print(f"Shape: {analysis['shape']}") |
| 98 | print( |
| 99 | f"Pitch range: {analysis['lowest_pitch']} – {analysis['highest_pitch']}" |
| 100 | f" ({analysis['range_semitones']} semitones)" |
| 101 | ) |
| 102 | print(f"Direction changes: {analysis['direction_changes']}") |
| 103 | print(f"Avg interval size: {analysis['avg_interval_size']} semitones") |
| 104 | |
| 105 | intervals = analysis["intervals"] |
| 106 | if intervals: |
| 107 | print("\nInterval sequence (semitones):") |
| 108 | parts = [f"{iv:+d}" for iv in intervals] |
| 109 | print(f" {' '.join(parts[:32])}{' …' if len(intervals) > 32 else ''}") |
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1 commit
sha256:d11a87833d5fad6059b7662844bf5448a8911a17cce7a51811f71ad394f248eb
bump to v0.2.0rc13
Human
patch
7 days ago