Smittix f29ae3d5a8 fix: Preserve image-start samples across VIS-to-decoder boundary ...

VISDetector._process_window() was calling self.reset() inside the
STOP_BIT handler, wiping self._buffer before feed() could advance
past the triggering window. All audio samples buffered after the
VIS STOP_BIT (the start of the first scan line) were silently
discarded, causing the image decoder to begin decoding mid-stream
with no alignment reference. The result was every scan line being
desynchronised from the first, producing the diagonal stripes and
scrambled colours seen in decoded images.

Fix: remove the premature reset() from _process_window(). The
STOP_BIT handler now sets state=DETECTED and returns the result.
A new remaining_buffer property exposes the post-VIS samples.
_decode_audio_stream() and decode_file() capture those samples
before calling reset(), then immediately feed them into the newly
created SSTVImageDecoder so decoding begins from sample 0 of
the first sync pulse.

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

2026-02-18 19:06:32 +00:00

..

__init__.py

Replace broken slowrx dependency with pure Python SSTV decoder

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

constants.py

Replace broken slowrx dependency with pure Python SSTV decoder

2026-02-06 19:47:02 +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 PD120 SSTV decode hang and false leader tone detection

2026-02-07 14:55:22 +00:00

modes.py

Replace broken slowrx dependency with pure Python SSTV decoder

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

sstv_decoder.py

fix: Preserve image-start samples across VIS-to-decoder boundary

2026-02-18 19:06:32 +00:00

vis.py

fix: Preserve image-start samples across VIS-to-decoder boundary

2026-02-18 19:06:32 +00:00