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The clients/apple scaffold is now a working macOS client, validated live against this repo's host across the LAN: gamescope virtual output → NVENC HEVC → lumen/1 (GF(2¹⁶) FEC + AES-GCM over UDP, QUIC control) → VideoToolbox → AVSampleBufferDisplayLayer at 720p60, mouse/keyboard flowing back as QUIC datagrams into the host's gamescope EIS injector (~3.7k events injected in one session). LumenKit: - LumenConnection: the predicted cbindgen compile fixes (C17 header spells the typedefs as integers while the enum constants import as a distinct Swift type — bridge by rawValue); close() is now safe from any thread (a close flag + pumpLock held across the blocking poll enforce the C contract "never close with a next_au in flight"; flag prevents lock-starvation by back-to-back polls). - StreamView: per-pump cancellation token (reconnects can't double-pump), flush + re-gate on the next in-band parameter sets when the layer fails, no stale enqueue after restart. - InputCapture: fractional-delta accumulation (sub-pixel motion isn't truncated away), pressed-state tracking with release-all on focus loss and stop() (nothing sticks down host-side), global-singleton ownership guard (GC has one handler slot per process), X1/X2 buttons, horizontal scroll, full keypad/CapsLock/ISO-102nd/PrintScreen/Menu VKs. - LumenClient app shell (swift run LumenClient): connect form, fps/Mb-s HUD, LUMEN_AUTOCONNECT/LUMEN_MODE for scripted first-light runs. - Tests: Annex-B byte-level units; real-codec round trip (VTCompressionSession-encoded HEVC rebuilt as the host's wire shape → AnnexB → VTDecompressionSession → pixels); test-loopback.sh (Swift client vs a real local m3-host over loopback — the Swift twin of c_abi_connection_roundtrip); RemoteFirstLightTests (full pipeline over the LAN). Host/build fixes that fell out: - The workspace builds on non-Linux again: gamestream audio (opus) and sendmmsg batching are now platform-gated with stubs/fallback, per the crate's "compiles everywhere" rule. - Horizontal scroll was inverted end-to-end: the injectors negated BOTH axes onto the ei/wl axes, but GameStream's horizontal convention is positive = right (moonlight-qt/Sunshine pass it through unnegated) — only vertical flips now. This also un-inverts real Moonlight clients. - AnnexB drops all zeros preceding a start code (trailing_zero_8bits padding), ffmpeg's policy, instead of leaking them into the preceding NAL. - build-xcframework.sh: deployment targets pinned to the package floor + an otool guard — cargo does not fingerprint MACOSX_DEPLOYMENT_TARGET, so warm caches can silently ship too-new minos objects. Adversarially reviewed (5-dimension multi-agent pass, every finding refutation-verified): 14 confirmed findings, all fixed above; the send-while-polling core-contract gap flagged here is closed by the lumen/1 session-planes work (&self pulls + per-plane borrow slots). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
lumen
A ground-up low-latency desktop streaming stack, built Linux-first, with a shared Rust protocol core and native clients per platform.
lumen is a placeholder codename. The bet: ship a Linux virtual-display streaming
host that speaks the existing Moonlight protocol (every Moonlight/Artemis client works
day one), then break the ~1 Gbps FEC wall with a GF(2¹⁶) Leopard-RS transport as a
negotiated extension. See docs/implementation-plan.md.
Status
| Milestone | State |
|---|---|
M1 — lumen-core + C ABI |
✅ done & tested (FEC, packetization, crypto, session, lumen_core.h) |
M0 — pipeline spike (wlroots→PipeWire→NVENC→file→lumen-core) |
✅ done & verified on NVIDIA (RTX 5070 Ti / driver 595) |
| M2 — P1 host → stock Moonlight | 🟡 capture+encode landed in M0; pairing/RTSP/vdisplay pending |
| M3 — measurement harness | 🟡 tools/loss-harness runs; latency-probe scaffolded |
| M4 — P2 transport + Rust client | 🟡 GF(2¹⁶) core done; lumen-client-rs scaffolded |
| M5 — Apple client | 🟡 macOS first light: HEVC on glass + input over lumen/1 (clients/apple) |
lumen-core is complete and verified: it builds and its full test suite (FEC recovery,
loopback round-trip under loss, property tests, and a C ABI harness) passes on
macOS/aarch64. M0 is done: lumen-host captures a headless wlroots output via the
ScreenCast portal + PipeWire, encodes it with NVENC, writes a playable H.265 file, and
round-trips every access unit through a lumen_core host→client session (see
docs/linux-setup.md). M2 is in flight: the GameStream control plane (gamestream/) and
the management REST API (mgmt.rs, OpenAPI spec in docs/api/) are implemented; the
remaining Linux host backends (KWin/Mutter virtual displays, libei input) are
#[cfg(target_os = "linux")] seams — defined and compiling, implementations pending.
Layout
crates/
lumen-core/ protocol · FEC · pacing · crypto — the C ABI (lib + cdylib + staticlib)
lumen-host/ Linux host: vdisplay · capture · encode · inject · gamestream · mgmt
lumen-client-rs/ reference client (M4): VAAPI decode + wgpu present
clients/{apple,android}/ native client scaffolds (import lumen_core.h)
include/lumen_core.h cbindgen-generated C header (checked in)
tools/{latency-probe,loss-harness}/ measurement (plan §10)
docs/implementation-plan.md
Build & test
cargo build --workspace # green on Linux and macOS
cargo test --workspace # unit + loopback + proptest + C ABI harness
cargo clippy --workspace --all-targets
cargo run -p loss-harness # FEC loss-resilience sweep (no network needed)
bash crates/lumen-core/tests/c/run.sh # standalone C-ABI link+round-trip proof
The C header regenerates from crates/lumen-core/src/abi.rs on every build (cbindgen via
build.rs) into include/lumen_core.h.
Design invariants
- One core, linked everywhere. Protocol/FEC/crypto/pacing live in
lumen-coreexactly once, exposed over a stable, versioned C ABI (lumen_abi_version(),LumenConfigcarries its ownstruct_size). - No async on the hot path. The per-frame pipeline uses native threads only;
tokio/quinnare gated behind the off-by-defaultquicfeature (control plane only). - FEC is the wall-breaker. GF(2⁸) (≤255 shards/block) for Moonlight compat; GF(2¹⁶) (≤65535 shards/block, SIMD, O(n log n)) to push past ~1 Gbps.
License
MIT OR Apache-2.0.