Smittix 2e9bab75b1 fix: Correct Scottie sync search to prevent decoder stall ...

The previous sync search used search_margin = line_samples/10 (~306
samples for Scottie2), reaching deep into B channel pixel data behind
pos and well past the expected sync end ahead of pos.

When _find_sync returned a position in the late portion of that wide
region, pos + R_channel_samples exceeded the buffer length. The
buffer-too-short guard in _decode_line then returned early without
consuming data or advancing the line counter, causing the stall guard
in feed() to permanently break the decode loop.

Fix: use a 50-sample backward margin (covers >130 ppm SDR drift) and
a forward margin capped to whatever the current buffer can safely
support for the R channel. A final candidate-position check before
committing pos ensures no overflow is possible.

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

2026-02-19 10:01:28 +00:00

..

__init__.py

Replace broken slowrx dependency with pure Python SSTV decoder

2026-02-06 19:47:02 +00:00

constants.py

fix: Correct SSTV VIS codes and replace Goertzel pixel decoder with Hilbert transform

2026-02-19 09:23:15 +00:00

dsp.py

Replace broken slowrx dependency with pure Python SSTV decoder

2026-02-06 19:47:02 +00:00

image_decoder.py

fix: Correct Scottie sync search to prevent decoder stall

2026-02-19 10:01:28 +00:00

modes.py

fix: Correct SSTV VIS codes and replace Goertzel pixel decoder with Hilbert transform

2026-02-19 09:23:15 +00:00

sstv_decoder.py

fix: Add missing SSTV mode specs for HF decoding (PD90/PD160/PD240/ScottieDX)

2026-02-18 21:29:34 +00:00

vis.py

fix: Improve HF SSTV VIS detection reliability and error correction

2026-02-18 21:52:56 +00:00