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* feat(midi): convert_midi_tempo_map — extract tempos, time signatures, beat grid
The keys/drums MIDI converters always built a tempo-aware tick->seconds
map internally (to bake note times) and then discarded it — and never
read time_signature meta at all — so every MIDI import landed with no
bars, no measures, and an implied 4/4 no matter what the file said.
New lib/midi_import.py helper convert_midi_tempo_map(midi_path,
track_index) extracts the grid a .mid actually carries:
- tempos: {time, bpm} per tempo event (deduped per tick, 120 default)
- time_signatures: {time, ts: [num, den]} — the song-timeline shape
- beats: one row per beat on the editor grid shape — numbered downbeats
with a den hint, measure:-1 interior beats; the beat unit follows the
active signature (6/8 = six eighth-note rows per bar)
Event scope mirrors _build_tick_to_seconds: SMF type 0/1 merge meta
from all tracks, type 2 reads ONLY the chosen track (independent
timelines — callers must never share one grid across type-2 tracks).
Mid-bar signature events (ill-formed but seen in the wild) apply at the
next bar boundary. All times compute from absolute ticks through the
cumulative tempo table and round once at emit — rounding error never
accumulates with song length. A bar-count safety valve guards malformed
files. Consumer: the editor's multitrack MIDI import (tempo-seed
dialog, feedBack-plugin-editor roadmap Phase 3).
Tests: tests/test_midi_tempo_map.py — 10 cases driving the REAL
function against real .mid files built with mido (no stubs): default
grid, tempo bends, 500-bar rounding-drift check, 4/4->3/4 and 6/8
signatures, mid-bar signature deferral, duplicate-tick last-wins,
type-2 meta isolation from a bogus sibling track, empty files, grid
coverage bounds. Full MIDI-adjacent suite green: 55 passed
(test_midi_tempo_map + test_midi_import + test_midi_import_drums +
test_gp2midi) under the project venv.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JEoFeTPSnz4NpwwCG52hnu
* fix(midi): make convert_midi_tempo_map robust — real division guard, symmetric tempo default, single-pass meta
- Push the ticks-per-beat fallback into _build_tick_to_seconds (the single
place ticks route through), guarding on `> 0` so a division==0 (malformed)
or negative SMPTE-division header no longer raises ZeroDivisionError or
walks the beat grid into negative times. Mirror the guard at the
convert_midi_tempo_map beat_ticks site. The local `or 480` was cosmetic
before — the closure still divided by the raw division.
- Seed tempos_out with a 120 BPM row at time 0 when the first set_tempo
lands after tick 0, symmetric with the (0, 4, 4) time-signature default,
so the sidecar matches the grid the head of the song actually used.
- Collapse the duplicated meta_source/note_source lists into one
source_tracks walked in a single pass (meta collection + end_tick).
- Fix a weak assert in test_mid_bar_signature_applies_at_the_next_boundary
(operator-precedence `(A and B) or C`) to assert den == 4 outright.
- Add tests: non-positive division (0 + negative SMPTE), first tempo after
start seeds 120@0, explicit SMF type-0 file, and the _TEMPO_MAP_MAX_BARS
safety valve.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: ChrisBeWithYou <chris@rifflarr.local>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: byrongamatos <xasiklas@gmail.com>
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| .github | ||
| .specify | ||
| content/starter | ||
| data/progression | ||
| docs | ||
| lib | ||
| plugins | ||
| scripts | ||
| specs | ||
| static | ||
| tests | ||
| .dockerignore | ||
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| build-proxmox-ct.sh | ||
| CHANGELOG.md | ||
| CLAUDE.md | ||
| CONTRIBUTING.md | ||
| docker-compose.nas.yml | ||
| docker-compose.yml | ||
| Dockerfile | ||
| LICENSE | ||
| main.py | ||
| package-lock.json | ||
| package.json | ||
| playwright.config.ts | ||
| pyproject.toml | ||
| requirements-test.txt | ||
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| server.py | ||
| SUPPORTERS.md | ||
| tailwind.config.js | ||
| TODO.md | ||
| uv.lock | ||
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