Three new metrics plug into the existing Metric registry. All inherit
the async compute path, so first-use is non-blocking and subsequent
switches hit the per-(file, metric) cache.
- CrestFactorMetric: 20*log10(peak/RMS) per 1 s window, 0.25 s hop.
Uses cumsum-of-squares for O(N) RMS. Reference lines at 12 dB
(roomy) and 6 dB (heavily limited).
- PSRMetric: sample-peak (dBFS) minus short-term LUFS over the same
3 s window as LUFSMetric, so the two plots line up. Reference lines
at 10 LU (good punch) and 4 LU (squashed).
- TruePeakMetric: ITU-R BS.1770 oversampled true peak via
scipy.signal.resample_poly at 4x over 250 ms / 100 ms windows.
data["integrated_tp_db"] carries the track-wide max.
- LUFSMetric now also computes Meter.loudness_range and surfaces it
in the plot legend alongside the integrated value.
- Shared _to_dbfs helper floors 20*log10 at _EPS so silent windows
don't explode.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Introduce a Metric ABC (compute on worker thread, render on GUI thread)
with a METRICS registry, and refactor the analysis pipeline around it.
RMS power (ported), raw waveform, and BS.1770 LUFS (via pyloudnorm) ship
as the initial three; new metrics drop in by appending to METRICS.
- metrics.py: Metric ABC + RMSPowerMetric, WaveformMetric (locked to
+/-1.1 y-range for float headroom), LUFSMetric (short-term 3 s window
+ integrated value, with streaming-target reference line).
- plot_control_widget.py: metric selector dropdown + Refresh Plot button
(moved out of FontControlWidget).
- analysis_results_manager.py: AnalysisResult caches the AudioFile and a
per-metric data dict; new MetricComputeWorker runs metric switches off
the GUI thread via metricComputeStarted/metricReady/metricComputeError
signals, so LUFS on a 12-minute track no longer stalls the UI.
- main.py: all redraw paths funnel through one _render_or_request helper;
stale-result guards keep slow computes from overwriting fresh selections.
- plotting_engine.py removed (metadata text moved onto AnalysisResult;
figure construction lives in each Metric).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Mikkeli Matlock