The minimum visible time window was a flat 2% of the file, but view.start
and view.end are normalized to the whole signal — so the achievable time
resolution scaled with file length. A 30-minute recording could never show
less than a 36-second span, while a 30-second one reached 0.6 s. Long
captures were effectively unreadable at the sample level no matter how far
you scrolled.
Derive the floor from the STFT hop instead (MinTimeViewWidth): segments sit
fftSize/HOP_RATIO samples apart, so the real limit is the point where only
a handful of segments span the viewport and further zoom would interpolate
rather than reveal. The floor is now a constant ~43 ms at 48 kHz/1024
regardless of duration — an 844x improvement on a 30-minute file, and it
tightens further with a smaller FFT. Guards cover the unloaded (sampleRate
0) and shorter-than-the-floor cases.
Zooming is also no longer forced to move both axes together. The bare wheel
keeps the existing coupled behaviour; Shift+wheel is time-only and
Ctrl+wheel frequency-only, so a long capture can be stretched along time
without collapsing the frequency range to match.
Time-axis labels now pick their precision from the span between adjacent
ticks (1 to 4 decimals, and m:ss.sss past a minute). At the spans this
change makes reachable the old fixed "%.1fs" printed the same value in
every slot, which read as a frozen axis.
Adds a `wheel X Y N [mod]` action to shot_input.sh for exercising zoom
headlessly, and known_bugs.md for behaviour that is unspecified rather
than broken.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V8ZWfr5XZyyDttvkhJUgHN
Commit the accumulated working-tree changes as one snapshot.
- Headless render: `--render OUT.png INPUT.wav` draws the spectrogram
(full window, or `--pane` for the spectrogram pane only) to a PNG
with no visible window. Options: `--annotations`/`--no-annotations`,
`--annotation-opacity`, `--width`/`--height`.
- mLnL annotations: parse the optional `mLnL` RIFF chunk (schema v2)
and render tx_frame/assertion/control overlays, a timeline lane, and
a waveform-scope echo, with hover tooltips on the spectrogram,
timeline, and scope.
- sched_offset_ms: parse the per-frame intent->air latency and surface
it in the hover tooltips (boxes stay air-anchored upstream).
- Supporting: build wiring (rspektrum.make), shared types/headers,
web-build and capture-script tweaks, and removal of the old
synchrosqueezing LaTeX doc.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
shot_input.sh launches the app under Xvfb and drives it with xdotool,
then screenshots for pixel-diff verification. Adds click/drag/rdrag
pseudo-actions that insert the frame gap raylib's button edge-detection
needs (a bare xdotool "click 1" is too fast and no-ops). Documents the
settled-capture timing (12s) and the 1280x800 viewport/sidebar bounds.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
tyler