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Second and final batch from the 2026-07-20 core-sweep lows: client: - connect() timeout now sets `quit` before shutdown, so a handshake that completes after the deadline closes with QUIT_CLOSE_CODE instead of leaving the host lingering (virtual display up) for a reconnect that never comes. - probe_result: saturating_add on the wire-supplied wire_packets + send_dropped counters (debug-build overflow panic / release wrap). - the standing-latency bleed no longer sets flush_in_window: that flag is the ABR's SEVERE (×0.7) verdict, and the bleed fires only on provably loss-free windows the controller itself scores as fine. clipboard: - fetch_cancels pruned on every new fetch (was: one dead oneshot per paste for the session). - serve chunks gated on a parked waiter + capped at CLIP_FETCH_CAP with an Error event (was: unbounded silent accumulation under any req_id). - serve_inbound park bounded by FETCH_STALL_SECS + send.stopped() (was: an unanswered FetchRequest parked the task, waiter, and bi-stream forever; ~100 of them exhaust the connection's bidi budget). C ABI (ABI_VERSION 9 → 10, header regenerated, additive only): - new punktfunk_connection_clock_offset_now_ns — the LIVE re-synced offset (Swift/Kotlin latency math read the frozen connect-time value ~40ms wrong after a wall-clock step). - to_config: checked u64→usize narrowing of max_frame_bytes (32-bit armeabi truncated >4GiB to a plausible residue). - host_poll_input: no &mut held across the embedder callback (re-entry aliased it — UB under noalias); mid-drain callback clears now stick. - next_audio_pcm: DTX (empty) payloads skipped — decode synthesized 120ms of concealment per 5ms slot and grew the playout ring forever. - next_clipboard releases the parked payload on an empty poll (a one-off 50MiB paste stayed resident all session). - frames_dropped / wants_decode_latency write their documented 0/false defaults before the NULL-handle check. - gamepad constant docs match pick_gamepad() reality (DualSenseEdge/ SwitchPro landed; DualSense/DS4 honored on Windows UMDF too). FEC: - gf8 reconstruct/reconstruct_into reuse the (k,m) codec cache like encode_into (was: fresh 230×200 generator + decode inversion per lossy block on the pump thread). - vendored fec-rs: the 8 safe wrap_mul_slice shims assert equal lengths (x86 SIMD callees bound stores on input.len() — safe-code OOB write); ReconstructShard's safety contract gains the len()==get().len() clause and reconstruct_internal sizes raw slices from the slice. transport/GTK: - Linux GSO super-buffer capped at the real UDP payload ceiling (65487) not 65535 — seg sizes ≥1024 could EMSGSIZE and latch GSO off process-wide, blamed on the network. - GTK settings dialog no longer rewrites an unlisted-but-valid stored gamepad preference to "auto" on close. Already fixed on main (verified stale, skipped): the reassembler FEC ceiling, wants_decode_latency's third term, request_probe rollback + the generalized probe watchdog. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
punktfunk — Linux client
The native Linux app for streaming a punktfunk host to your desktop, laptop, or Steam Deck.
It's a clean relm4/GTK4/libadwaita shell that finds hosts on your network, pairs with a PIN,
and manages your settings and library — the stream itself runs in the sibling
punktfunk-session Vulkan binary (clients/session), which the shell
spawns, putting the picture on glass at your display's own resolution and refresh rate.
Built in Rust end to end (no C ABI): the shell shares its plumbing with the session binary through
crates/pf-client-core, which links the punktfunk-core protocol crate and speaks the fast
punktfunk/1 protocol — QUIC control plane, GF(2¹⁶) FEC + AES-GCM data plane.
Features
- Zero-copy hardware decode — the session presenter decodes via Vulkan Video on every GPU vendor (including NVIDIA), falling back to FFmpeg VAAPI → DRM-PRIME dmabuf and then software when Vulkan Video is unavailable.
- Your display's native mode — the host builds a virtual output at exactly your WxH@Hz; no scaling, no letterboxing. Steady 60 fps at 1080p60, ~6 ms capture→decoded on the LAN.
- Audio both ways — PipeWire playback with a jitter ring, plus mic uplink to the host.
- Full controller support — SDL3 gamepads with rumble and DualSense fidelity (lightbar, player LEDs, touchpad, motion, adaptive-trigger replay). Click-to-capture keyboard and mouse, with a release chord (Ctrl+Alt+Shift+Q) and focus-loss release.
- Find hosts automatically — mDNS discovery lists hosts on your LAN; saved hosts persist. First connect does a one-time SPAKE2 PIN pairing (or TOFU on trusted LANs), then reconnects on a pinned identity.
- Per-host speed test to pick a bitrate, plus compositor and mode preferences in Settings.
- Game library browser (experimental, off by default) — "Browse library…" on a saved host shows its games (Steam + custom) as a poster grid; click one to launch it in the session. Fetched from the host's management API over mTLS — paired devices are authorized by their certificate, no extra host setup.
- Gamepad library launcher (
--browse host) — a console-style, controller-driven library view of a paired host's games, rendered by the session binary's Skia console UI: A plays the focused title, B quits, L1/R1 jump. Built for the Steam Deck plugin's "Open library" launch; session end returns to the launcher. Arrow keys/Enter/Esc drive it too (no pad needed).
Get it
Most people should install a package rather than build from source:
| Distro | Install |
|---|---|
| Flatpak (any distro, Steam Deck) | io.unom.Punktfunk — see packaging/flatpak |
| Ubuntu / Debian (apt) | sudo apt install punktfunk-client (after adding the repo) |
| Fedora / Bazzite (rpm) | rpm-ostree install punktfunk-client |
| Arch (PKGBUILD) | see packaging/arch |
Per-device install steps and pairing walkthrough: docs.punktfunk.unom.io/docs/install-client.
Build & run from source
Requires GTK ≥ 4.16, libadwaita ≥ 1.5, FFmpeg 7 or 8 (with VAAPI for hardware decode), PipeWire, and SDL3 (with hidapi) development packages.
# from the repo root
cargo run -p punktfunk-client-linux # launch the app
cargo run -p punktfunk-client-linux -- --connect HOST[:PORT] # skip the host list and connect
cargo run -p punktfunk-client-linux -- --browse HOST # the gamepad library launcher
The binary is named punktfunk-client — the relm4/libadwaita desktop shell (hosts,
pairing/trust, settings, the desktop library page). Every stream and the console game
library run in the sibling punktfunk-session Vulkan binary; the shell spawns it
for connects, and --connect/--browse on the shell exec it directly (so the Decky
wrapper keeps working unchanged). Headless flags stay in the shell:
--pair <PIN> --connect host[:port] (pairing ceremony), --wake host[:port], and
--library host[:mgmt_port] (print a host's game library).
Layout
src/
main.rs · app.rs entry point, relm4 AppModel (window, trust gate, session child
lifecycle, typed messages), primary menu, CSS
cli.rs headless paths (--pair/--wake/--library), the --connect/--browse
exec handoff to punktfunk-session, screenshot scenes
ui_hosts.rs hosts page component (FactoryVecDeque cards, saved + discovered
grids, add-host dialog, banner)
ui_library.rs game-library poster grid (per-host, launches titles)
ui_trust.rs TOFU / PIN-pairing / request-access dialogs
ui_settings.rs resolution · refresh · decoder · bitrate · compositor · mic
spawn.rs the session-child plumbing (stdout contract → AppMsg)
tools/screenshots.sh store screenshot capture (app self-capture; Xvfb fallback)
The UI-agnostic plumbing — session pump, FFmpeg decode, PipeWire audio, SDL3 gamepads +
keymap, trust store, mDNS discovery, library client, Wake-on-LAN — lives in
crates/pf-client-core, shared with the Vulkan session binary.
Related
- Documentation — quick start, pairing, troubleshooting
- Steam Deck plugin — launches this client fullscreen in Gaming Mode
- Project README — the host, the other clients, and how it all fits together