DR-242. Intent, not device operations. `open` carries the start position, so no caller sequences load-then-seek and none can race an engine's asynchronous load — the engine is the only layer that knows when its pipeline can accept a position, and it absorbs that internally by deferring or re-opening. `seek` states a destination and nothing else. Whether that is an in-place seek or a re-opened stream is the engine's business: hls.js seeks within a VOD playlist, mpv's HLS demuxer cannot make a server transcode from a new offset. Callers stop guessing on behalf of engines they do not own. `snapshot` is one coherent read rather than a dozen getters, because reading position and duration separately is how a player reported <position> / 0.0 when a file unloaded between the two calls. `Phase::Opening` names the state the previous design could not express, and is the direct cause of DR-241: a seek arriving with nothing loaded had no phase to be queued against, so it was discarded. `Capabilities` exists so callers adapt without naming engines. If a caller ever branches on which engine it holds, this struct is missing something — engine identity leaking into callers is the coupling DR-238 came from. Nothing consumes it yet; PlayerController is ported in DR-245. Carries an explicit allow(dead_code) tied to that step rather than being hidden behind cfg(test), because it is production code being built in shippable pieces.

JellyTau
A cross-platform Jellyfin client built with Tauri, SvelteKit, and TypeScript.
Business logic lives in a Rust backend; a UI-rich Svelte frontend handles presentation and talks to it over Tauri's IPC. Targets Linux (libmpv) and Android (ExoPlayer).
Getting Started
This project uses bun as its package manager.
# Activate the Rust environment (fish shell)
source "$HOME/.cargo/env.fish"
# Install dependencies
bun install
# Run in development
bun run tauri dev
# Type-check the frontend
bun run check
# Build for Linux
bun run tauri build
# Build for Android
bun run tauri android build
For the full set of build, test, and Android helper scripts, see scripts/README.md.
Documentation
| Topic | Location |
|---|---|
| Architecture overview & subsystem docs | docs/architecture/ |
| Requirements, traceability & technical debt | docs/requirements.md |
| Build & release process | docs/build/build-release.md |
| Docker builds | docs/build/docker.md |
| Traceability tooling & CI | docs/traceability.md, docs/traceability-ci.md |
| Release checklist | docs/release-checklist.md |
| UX flows | docs/ux-flows.md |
| CI operations (builder image, secrets, runner) | docs/build/ci-operations.md |
Contributing
CONTRIBUTING.md covers the setup, the gates a change has to pass, and the two rules that catch people out (bug fixes start with a failing test; Jellyfin's taxonomy stays in Rust). Please also read the Code of Conduct.
Found a security problem? Do not open an issue — see SECURITY.md.
Verifying a download
Every release publishes SHA256SUMS covering all of its artifacts, plus an SBOM
of what went into the build:
sha256sum -c SHA256SUMS
Desktop builds update themselves from Settings → Updates, verifying each payload against JellyTau's signing key before installing. Android installs are handled by the system installer, so the app links to the releases page instead.
Recommended IDE Setup
VS Code + Svelte + Tauri + rust-analyzer.
License
MIT