punktfunk/clients/windows/README.md

punktfunk — Windows client

The native Windows app for streaming a punktfunk host to your PC. A modern WinUI 3 app that discovers hosts on your network, pairs with a PIN, and streams at your display's own resolution and refresh rate — with a hardware-accelerated D3D11 video path and HDR.

It's pure Rust: the UI is WinUI 3 driven through windows-reactor (a declarative, React-like framework), and it links the shared punktfunk-core directly to speak the fast punktfunk/1 protocol.

Features

• Hardware decode, GPU present — FFmpeg HEVC with a D3D11VA zero-copy path (decoder and presenter share one D3D11 device; NV12/P010 textures sampled straight into a SwapChainPanel composition swapchain), with a robust software-decode fallback.
• HDR10 — advertise 10-bit/HDR, detect PQ in-band, and flip the swapchain to R10G10B10A2 + ST.2084 with HDR10 metadata.
• Your display's native mode — the host builds a virtual display at exactly your WxH@Hz.
• Audio both ways — WASAPI render + mic capture.
• Full controller support — SDL3 gamepads with rumble, lightbar, and DualSense feedback.
• Find hosts automatically — mDNS discovery lists hosts on your LAN, alongside saved and manual entries. First connect does a one-time SPAKE2 PIN pairing (or TOFU on trusted LANs), then reconnects on a pinned identity.
• Polished shell — host cards, settings (resolution / refresh / decoder / bitrate / HDR / mic), a status-chip stream HUD, and the full trust surface. Stream input uses Win32 low-level hooks with a Ctrl+Alt+Shift+Q capture toggle.

Builds and ships for both x64 and ARM64 as a signed MSIX.

Get it

Install the signed MSIX from the package registry — see docs.punktfunk.unom.io/docs/install-client. A stock Moonlight client also works over GameStream if you prefer.

Build from source

Windows-only (the crate builds as a stub on other platforms so the workspace stays green). You need the MSVC toolchain, an FFMPEG_DIR FFmpeg tree, and CMake (SDL3 builds from source). windows-reactor's build.rs downloads the Windows App SDK NuGets and needs CARGO_WORKSPACE_DIR set.

cargo build -p punktfunk-client-windows --target x86_64-pc-windows-msvc

# CLI paths for testing (no window):
punktfunk-client --discover                                   # list hosts on the LAN
punktfunk-client --headless --connect host[:port] [--pin HEX] # connect, count frames, print stats

CARGO_HOME must be an ASCII path — non-ASCII characters break SDL3's MSVC precompiled-header build. Packaging (MSIX manifest, signing) lives in packaging/.

Layout

src/
  main.rs · app.rs        entry point + CLI paths; WinUI 3 shell (windows-reactor)
  present.rs · gpu.rs      SwapChainPanel D3D11 composition swapchain; shared D3D11 device
  video.rs                FFmpeg HEVC decode (D3D11VA zero-copy + software fallback)
  audio.rs                WASAPI render + mic capture
  gamepad.rs              SDL3 controllers + rumble/lightbar/DualSense feedback
  input.rs                Win32 low-level keyboard/mouse hooks → host input
  session.rs              session lifecycle over the NativeClient connector
  trust.rs · discovery.rs persistent identity, TOFU/PIN pairing, mDNS browse
packaging/                MSIX manifest, signing, pack script

Related

• Documentation — quick start, pairing, troubleshooting
• Project README — the host, the other clients, and how it all fits together