Add signal-level detection that monitors luminance variance to auto-start
receiving when tuning in mid-image (~3s of sustained modulated signal),
matching fldigi's "strong image signal" detection. Reduce APT sustain
to 1.0s (2 windows) matching fldigi. Emit initial "Idle — scanning"
state event so the frontend shows the decoder is processing audio.
Add tracing instrumentation for luminance stats and tone analysis.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
- Fix WefaxProgress.line_data serialization: change from Vec<u8> (JSON
array) to base64-encoded String so the browser's atob() call works
- Set output_dir in server WefaxConfig to $XDG_CACHE_HOME/trx-rs/wefax
so decoded PNG images are persisted to disk
- Add /images/{filename} GET route in trx-frontend-http to serve saved
WEFAX PNGs with path traversal protection
- Capture live canvas as data URI on image completion for immediate
gallery thumbnail display without requiring the file serving route
https://claude.ai/code/session_01V1kLpgLPb8Q5wSv4UrcLbr
Signed-off-by: Claude <noreply@anthropic.com>
Pure Rust WEFAX (Weather Facsimile) decoder supporting 60/90/120/240 LPM,
IOC 288 and 576, with automatic APT tone detection and phase alignment.
Core DSP pipeline:
- Polyphase rational resampler (48k→11025 Hz)
- FM discriminator (Hilbert FIR + instantaneous frequency)
- Goertzel tone detector (300/450/675 Hz APT tones)
- Phase alignment via cross-correlation on phasing signal
- Line slicer with linear interpolation pixel clock recovery
- Image assembler with PNG encoding
State machine: Idle→StartDetected→Phasing→Receiving→Stopping
Server integration:
- WefaxMessage/WefaxProgress in trx-core DecodedMessage
- DecoderConfig, DecoderResetSeqs, RigCommand wefax variants
- DECODER_REGISTRY entry in trx-protocol
- DecoderHistories/DecoderLoggers wefax support
- run_wefax_decoder() async task in trx-server audio.rs
- History persistence in pickledb store
Frontend integration:
- wefax.js plugin with live canvas rendering and gallery
- HTML sub-tab with canvas, gallery, toggle/clear controls
- SSE dispatch for wefax/wefax_progress events
- Decode history worker and restore support
- Toggle/clear API endpoints
19 unit tests covering resampler, FM discriminator, tone detection,
phasing, line slicing, image encoding, and decoder state machine.
https://claude.ai/code/session_019eyxgx3LuhcFZ7T5tr2Trm
Signed-off-by: Claude <noreply@anthropic.com>
sjg
Claude