Grayline

Amateur radio digital mode applications in Rust, over a shared signal processing and platform core.

Each mode ships as its own application rather than as one multimode program, because what a mode needs on screen follows from the kind of signal it carries: an image mode wants a raster and a receive library, a text mode wants a waterfall and a transmit buffer. The core underneath them is shared; the interfaces are not.

Applications

Application	Directory	Status
Grayline SSTV	apps/sstv/	Released
Grayline WEFAX	apps/wefax/	Receive implemented
Grayline RTTY	apps/rtty/	Live receive and buffered AFSK transmit implemented
Grayline PSK	—	Planned

apps/web-demo/ builds the SSTV receive path for WebAssembly, running at https://rssstv.kb10uy.dev/.

Layout

• apps/ — one directory per application, plus the browser demo.
• crates/ — the libraries. Directory names carry no prefix; the packages they hold are named grayline-*.
• tools/ — development command-line tools that are not shipped. One directory per mode, named <mode>-cli, holding the package grayline-<mode>-cli and the binary gl-<mode>. tools/qso-cli/ provides gl-qso for the shared contact directory and ADIF import.
• assets/ — data shipped outside any one crate, such as the ported MMSSTV templates under assets/templates/.
• docs/memo/ — development documentation, divided by subject and indexed by docs/memo/README.md.
• docs/reference/mmsstv/ — the original MMSSTV source, a submodule kept as the behavioral reference.
• docs/reference/mmtty/ — the original MMTTY source, a submodule kept as the behavioral reference for RTTY.

The shared libraries are dsp, audio, rig, shell, qso, and variables. The protocol crates carry their mode's name. tone-tx converts SSTV timed-tone events to PCM and still depends on grayline-sstv. shell is what an application is built out of before it knows which signal it carries: the window, the platform integration, the message lookup, and the log. crates/sstv-rx still holds the SSTV receive front end whole; the parts of it that are not specific to SSTV move down into the core as the second mode needs them.

Building

cargo build --workspace
cargo test --workspace

License

LGPL-3.0-or-later. See LICENSE.

Special Thanks

• mm-open.org
• Mako JE3HHT