pippin

pippin brings macOS High-Performance Screen Sharing to Linux.

Normally reserved for Mac-to-Mac connections, Apple's high-performance mode delivers low-latency, color-accurate remote desktop sessions. pippin is a native Rust client that connects directly to your Mac's built-in screen sharing server—no third-party software required on macOS.

Features

• Crisp Video & Audio: Streams sharp HEVC 4:4:4 video with system audio.
• Dynamic Display: Automatically resizes the Mac's resolution to fit your Linux window.
• Zero-Lag Cursor: Renders the cursor locally so mouse movement always feels instant.
• GPU-Accelerated: Uses hardware decoding via CUDA or VAAPI whenever supported.
• Two-Way Clipboard: Copy and paste text and images seamlessly between Linux and macOS.

Requirements

• Host (Mac): Apple Silicon running macOS Sonoma (14.0) or later.
• Client (Linux): X11 or Wayland with a wgpu-supported GPU (Vulkan or OpenGL).
• Network: IPv4 with UDP ports 5900 and 5901 open.
• Audio (Optional): Install libfdk-aac (pacman -S libfdk-aac, apt install libfdk-aac2, or dnf install fdk-aac). Without it, pippin runs silently.

Quick Start

1. On your Mac, enable System Settings → General → Sharing → Screen Sharing.
2. On Linux, install pippin (see below) and connect:

pippin my-mac.local -u alice

Installation

Arch Linux

Official AUR packages (pippin and pippin-git) are ready and will be published as soon as AUR account registration reopens. In the meantime, you can build and install the pacman package directly from the repository (which includes the desktop entry and icon):

git clone https://github.com/jonesy827/pippin
cd pippin/packaging/aur/pippin-git
makepkg -si

Cargo (All Other Distros)

Building from source requires Rust 1.95 or newer (use rustup if your distro's package is older), along with clang, pkg-config, FFmpeg development headers, and ALSA:

# Debian 13 / Ubuntu 24.04
sudo apt install build-essential pkg-config clang libclang-dev libavcodec-dev libavutil-dev libasound2-dev

# Fedora
sudo dnf install gcc pkgconf-pkg-config clang clang-devel libavcodec-free-devel libavutil-free-devel alsa-lib-devel

Then install the binary via Cargo:

cargo install --locked --git https://github.com/jonesy827/pippin

Optional: cargo install only installs the binary. To launch pippin from your desktop application menu, install the .desktop entry and icon from a local checkout of this repository:

install -Dm644 assets/pippin.desktop ~/.local/share/applications/pippin.desktop
install -Dm644 assets/pippin.svg ~/.local/share/icons/hicolor/scalable/apps/pippin.svg

Authentication

Unless --dialog is passed, pippin checks for your password in the following order:

1. --password <PASS> or the PIPPIN_PASSWORD environment variable
2. Standard input via --password-stdin
3. Your desktop keyring
4. An interactive terminal prompt (or the GUI connect dialog if launched from an app menu)

# Example using pass
pass show mac | pippin my-mac.local -u alice --password-stdin

When prompted interactively, pippin offers to save your password to the desktop keyring. You can also pass --save-password to save it automatically, or --forget-password to remove an existing entry.

Options

Performance & Troubleshooting

Hardware Decoding

macOS streams exclusively in HEVC 4:4:4, which requires specific hardware support:

• NVIDIA: Supported on Turing (GTX 16-series / RTX 20-series) or newer via CUDA.
• Intel: Supported on Ice Lake (10th Gen) or newer via VAAPI (verify by checking vainfo for VAProfileHEVCMain444).
• AMD: Hardware decoding is not supported for HEVC 4:4:4. pippin automatically falls back to CPU decoding, which works well at the cost of higher CPU usage.

By default, pippin tries cuda → vaapi → software.

Slow or Lossy Networks

Apple's protocol does not retransmit dropped video packets—any lost packet stalls the video until a full keyframe arrives. Even 1% packet loss can freeze the display half the time. To smooth out unstable connections:

• Pass --render-scale 0.5 to shrink keyframe sizes and cut bandwidth usage.
• Pass --after-loss conceal to keep the video moving through packet drops (the image will smear briefly until the next keyframe, rather than freezing).

4K Streaming

Switching to 4K can briefly backlog incoming video in the kernel (~670 KB) while the decoder initializes. If you experience dropped frames at 4K, raise Linux's maximum UDP receive buffer:

sudo sysctl -w net.core.rmem_max=8388608

Limitations

• Clipboard: Supports text and images, but not file transfers.
• Single Instance / IPv4: Media ports are fixed, limiting pippin to IPv4 and one active session per client machine.

Development

Run the test suite with:

cargo test

• Wire Format Tests: src/interop_tests.rs verifies the protocol byte-for-byte against reference test vectors.
• Decoder Tests: Marked --ignored by default as they require sample HEVC streams in PIPPIN_TEST_HEVC_DIR. You can generate these using FFmpeg (testsrc2 + libx265); see src/video/decoder.rs for expected filenames.
• Network Telemetry: Pass --stats-json FILE to log per-second metrics (schema in src/session/metrics.rs).
• Live Control: Set PIPPIN_CONTROL_FIFO=/tmp/pippin.ctl to adjust parameters on the fly (e.g., echo 'render_scale 0.5' > /tmp/pippin.ctl). Supported commands (render_scale, after_loss, hold, recovery, ltr, fps, keyframe, restart) are documented in src/session/operating.rs.
• AUR Packaging: AUR package definitions live in packaging/aur/. After tagging a release, bump pkgver in packaging/aur/pippin/PKGBUILD, then run updpkgsums and makepkg --printsrcinfo > .SRCINFO before pushing to the AUR.

Credits & License

pippin is an independent Rust implementation built on the protocol reverse-engineering work of iShareScreen.

Licensed under the AGPL-3.0-or-later. See LICENSE for details.