Smittix 28891f4709 Fix SSTV decoder thread lifecycle and VIS detection reliability ...

Three bugs preventing the live SSTV pipeline from working:

1. Race condition: self._running was set AFTER starting the decode
   thread, so the thread checked the flag, found it False, and exited
   immediately without ever processing audio.

2. Ghost running state: when the decode thread exited (e.g. rtl_fm
   died), self._running stayed True. The decoder reported as running
   but was dead, and subsequent start() calls returned without doing
   anything - permanently stuck until app restart.

3. VIS detection fragility: unclassifiable windows at tone transition
   boundaries (mixed energy from two tones) caused the state machine
   to reset from LEADER/BREAK states back to IDLE, dropping valid
   VIS headers on real signals.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-07 10:33:08 +00:00

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