Fit flags on precision (<0.6) and chance-corrected lift (<0.25), null with <8
recording onsets; old match rate kept as audibleRate (info). Symbolic-chroma
beat/bar-shift check per window. Constant-offset baseline (-2..+2 s) replaces
DTW without manual anchors unless DTW precision is better by >=0.02. Stretch
warning counts in the fit summary. DTW: slope-limited steps, open begin/end
options; per-bar outlier rejection (1/4 beat, Theil-Sen-transported +-3 bar
median); no anchor in the final partial bar. bench real: saved/computed
source, baseline + method, corrupt alignment.json skipped. Parabolic onset
interpolation; warp extrapolation documented; spec amended.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Token-protected Bun.serve server (bun run align [--host] [--port]
[--url-host] [--root]) with the layout-A page: recording and warped-MIDI
lanes on one zoomable timeline, draggable anchors (recording end / MIDI
end), stretch tempo labels with warnings, fit-flagged windows, Web Audio
playback with mix choice, auto-align, save, reset, undo. API per the task
brief; transcode/peaks cache under reference/<id>/. Adds bun run align
auto <id>, writeSmf (tests), encodeWav, recordingOnsets/fitFromOnsets,
fitSummary and stretch tempo helpers.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The coarse-path fallback now expands each 10 Hz step to five 50 Hz steps so its
diagonals still yield bar anchors; fine band widths are injectable to test it.
Offset pooling is clipped to the current segment, and auto anchors need
audioSec > 0 unless midiSec is 0. Tests: forced fallback, wrong manual anchor,
p90 bound; debug output gated behind ALIGN_DEBUG.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Coarse (10 Hz) DTW per stretch between manual anchors, refined at 50 Hz in a
band that widens 0.5 -> 1 -> 2 s on unreachable end cells (coarse path as last
resort); one auto anchor per bar from median offsets of diagonal path steps.
Fit quality from raw-audio onset peaks vs warped scored-role MIDI onsets
(+-70 ms, 30 s windows, flagged on rate < 0.5 or median > 60 ms).
trackKeys moves to src/align/roles.ts (pure) and is re-exported by manifest.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
