- AudioTapContext tracks: peak amplitude, active/silent call counts,
skip/error counters, last active timestamp
- tapProcess computes peak per buffer (every 16th sample for perf)
- writeDiagnosticReport() generates .txt report after each recording:
* Verdict: OK / FAIL / WARN with specific diagnosis
* Full tap stats, format info, skip/error breakdown
* 'How to Read' section for quick interpretation
- Report saved alongside mp4 (same name, .txt extension)
- showSaveDialog moves both mp4 and report together
yumoqing
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