lan_audio_link

lan_audio_link is a generic, product-agnostic Flutter desktop plugin for real-time PCM audio transport across a local network.

Current MVP scope:

• Native implementation for Windows and macOS
• LAN-only UDP transport
• Uncompressed PCM audio at 48 kHz, 16-bit, stereo by default
• Input device enumeration
• Output device enumeration
• Sender mode with live capture from a selected device
• Multi-receiver sender fan-out to several LAN targets in parallel
• Receiver mode with bounded jitter buffering and live playback to a selected device
• openLan and restrictedLan receiver access control
• Dart streams for link state, levels, and stats

What this plugin does not do in the MVP:

• Public internet streaming
• Icecast, Shoutcast, LiveKit, WebRTC, SRT, or Opus
• Audio recording or saving PCM/audio files to disk
• Historical persistence of packets, buffers, or audio frames

Example API

final link = LanAudioLink();

final inputs = await link.getInputDevices();
final outputs = await link.getOutputDevices();

await link.startSender(
  inputDeviceId: inputs.first.id,
  targetHosts: const ['192.168.1.20', '192.168.1.21'],
  targetPort: 5000,
);

await link.stop();
await link.dispose();

Native architecture

• Dart API and controller layer in lib/src
• Method channel boundary for platform-independent Flutter usage
• Windows native core in windows/native
• macOS native core in macos/lan_audio_link/Sources/lan_audio_link
• Device management separated from capture, playback, and UDP transport
• Fixed-size bounded receiver jitter buffer
• Packet header with magic, version, sequence, timestamp, format, and payload size

Roadmap

Future phases may add:

• Linux support
• Opus compression
• SRT transport
• Encryption
• Broader remote-network support