enricobuehler
4d89dcd3d7
Root cause of the field report (Android client, Windows host: no audio until the user manually cycled Sound-output devices, then audio on BOTH PC and phone): the WASAPI loopback captured whatever the default render endpoint was at open time — not the wiring plan's chosen endpoint — the plan's IPolicyConfig default-set is warn-only and racy, and nothing reacted to mid-stream default-device changes. - Explicit-endpoint capture: the capture thread opens the plan's loopback_render by id, never "the default" (KEEP_DEFAULT preserves the old default-capturing behavior with the echo guard). - Client-only playback default: wiring_plan::plan(..., host_audio) prefers a silent sink (Steam Streaming Microphone render side — loopback-validated, silent on host) over real hardware, so stream audio plays on the client only; PUNKTFUNK_HOST_AUDIO=1 restores real-hw-first (audible on the host). The capture side auto-installs the Steam pair once per process when no silent sink exists; open() handshake timeout 3s -> 30s to cover it, and a handshake timeout now stops the detached thread (it used to run for the process lifetime with the default still parked). - Self-healing capture thread (wasapi_cap): outer capture_once loop (Assert|Follow) with a ~1s watchdog on the default render id. A user switch to a capturable endpoint is followed (their choice wins, audio on both); a switch to a dud (cable/SSS/mic target) re-asserts the plan; IPolicyConfig-denied converges to Follow instead of churning. Device errors reopen with 2s backoff; only the FIRST open failure is fatal. Zero-packets breadcrumb after 30s distinguishes broken-loopback from quiet-desktop. - Park/restore of the default playback device (audio_control): wire_now(set_playback) parks the default on the loopback sink only for the capture's lifetime (the mic pump passes false — it runs while the host is idle); crash marker audio-default.prev + recover_orphaned_default() at first wire; restore is skipped if the operator changed the default themselves. A mic-default hygiene pass keeps VB-Cable installs audible and never records the mic target as the restore target. - Session-end park_audio_capture(): Windows DROPS the capturer (thread join restores the default) instead of caching it; Linux keeps the parked PipeWire thread. Composes with the stream-sink idle() hook at all three park sites (idle is a no-op on Windows). Verified: Linux (.21) clippy -D warnings + 176 punktfunk-host tests green (incl. the new wiring-plan preference tests); Windows (.173) clippy with nvenc,amf-qsv --all-targets -D warnings green at this exact tree. On-glass winbox/Android validation still owed. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
punktfunk-host
The streaming host — the program you run on the machine whose desktop or games you want to stream. For each client that connects, it spins up a virtual display sized to that device, captures it on the GPU, encodes with hardware NVENC/VAAPI/AMF/QSV, and sends it out over a low-latency transport — no physical monitor, no letterboxing, no rearranging your real screens.
It speaks two protocols from one process:
- GameStream — so any Moonlight / Artemis client works day one.
punktfunk/1— punktfunk's own faster protocol (QUIC control plane, GF(2¹⁶) FEC + AES-GCM data plane) that the native clients use.
Runs on Linux (the primary, most battle-tested path) and Windows (x64). The shared protocol,
FEC, and crypto live in punktfunk-core; this crate is everything
platform-facing around it.
What it does
- Per-client virtual displays at the exact WxH@Hz. Linux uses per-compositor backends — KWin, gamescope, Mutter, and Sway/wlroots; Windows uses its own all-Rust IddCx virtual display, even on the secure desktop (UAC / lock screen).
- GPU zero-copy capture → encode. dmabuf → CUDA/Vulkan → NVENC on Linux; on Windows the host pushes frames straight into its own IDD (sealed IDD-push, no screen-scraping) → GPU encode. Encoders auto-select by GPU vendor: NVENC (NVIDIA), VAAPI (Linux AMD/Intel), AMF/QSV (Windows AMD/Intel), or software H.264 as a floor. HDR/10-bit and HEVC 4:4:4 supported.
- Input injection. Mouse/keyboard (libei / gamescope EIS / wlr / Windows SendInput) and virtual gamepads — Xbox 360/One, DualSense, DualShock 4 — with rumble and HID feedback back-channels.
- Audio both ways. Opus audio host→client, plus a virtual microphone the client can talk into.
- Trust & discovery. A persistent host identity, SPAKE2 PIN pairing (default) or TOFU, and mDNS auto-advertisement so clients find the host without typing an IP.
- Management API + web console. A REST API (
mgmt.rs, OpenAPI atapi/openapi.json) drives status, paired devices, and on-demand pairing; the browser UI is inweb/.
Run it
punktfunk-host serve runs inside your desktop session. Bare serve is the secure native-only
default (punktfunk/1 + the management API); add --gamestream on a trusted LAN to also accept
stock Moonlight clients.
# Linux, from the repo root (see the repo README "Running on this box" for the headless recipe):
cargo run -rp punktfunk-host -- serve # native-only (secure default)
cargo run -rp punktfunk-host -- serve --gamestream # + Moonlight compatibility
Then pair from the web console (https://<host-ip>:47992) or the client app.
Most people should install a package rather than run from source — see
packaging/ (apt · rpm/COPR/bootc · Arch/sysext · Windows installer) and
the per-platform guides at docs.punktfunk.unom.io/docs/install.
Subcommands
| Command | Purpose |
|---|---|
serve |
The host (native punktfunk/1 + mgmt API; --gamestream adds Moonlight). |
punktfunk1-host |
Standalone native-protocol listener for testing/measurement (--source virtual, --max-sessions). |
openapi |
Print the management-API OpenAPI spec (regenerates api/openapi.json). |
library |
Inspect the multi-store game library. |
service · driver · web |
Windows: SCM service, driver install, bundled web console. |
*-test / *-selftest / *-probe |
Diagnostics (input, zero-copy, HDR, compositor, gamepads). |
--help lists them all.
Layout
src/
main.rs CLI + subcommand dispatch
config.rs · session_plan.rs · session_tuning.rs · pipeline.rs session setup + the frame pipeline
vdisplay/ per-compositor virtual outputs (kwin · gamescope · mutter · wlroots)
capture/ · capture.rs screen/dmabuf capture (+ Windows IDD-push)
encode/ · encode.rs per-GPU encoders (nvenc · vaapi · ffmpeg_win (AMF/QSV) · sw)
linux/zerocopy/ dmabuf → CUDA → NVENC bridges (EGL/GL tiled, Vulkan LINEAR)
inject/ · inject.rs input backends (libei · wlr · uinput gamepads · UHID DualSense/DS4)
audio/ · audio.rs Opus out + virtual mic (PipeWire / WASAPI)
gamestream/ Moonlight compat: nvhttp · pairing · rtsp · control · stream · gamepad · apps
native.rs the native punktfunk/1 host (QUIC control + native-thread UDP data plane)
mgmt.rs · native_pairing.rs · stats_recorder.rs management API, pairing, perf capture
hdr.rs · library.rs HDR metadata; multi-store game library
linux/ · windows/ platform-confined backends
Related
punktfunk-core— the shared protocol · FEC · crypto core- Clients — the apps that connect (Apple · Linux · Windows · Android · probe)
- Packaging & docs — install & operate
- punktfunk-planning (internal planning repo) — architecture rationale and deep-dive plans