Rcast - Go DLNA MediaRenderer for macOS (IINA)

A lightweight DLNA/UPnP AV MediaRenderer (DMR) written in Go for macOS.
It announces itself on your LAN, accepts external cast/control requests from DLNA control points, and plays media via IINA.
Includes session ownership (single-controller at a time) and optional system volume linkage.

Features

• SSDP discovery as MediaRenderer
• UPnP services
  • AVTransport: SetAVTransportURI, Play, Pause, Stop
  • RenderingControl: SetVolume/GetVolume, SetMute/GetMute
• IINA integration
  • Uses iina-cli if available, otherwise falls back to IINA app or AppleScript
• Session ownership
  • Single active controller per session
  • Configurable preemption policy
• Optional macOS system volume linkage (via AppleScript, darwin only)
• Static UUID persistence for stable discovery identity

Usage

# Run with default settings
rcast

# Enable debug logging
rcast --debug

# Open IINA in fullscreen mode
rcast --fullscreen
# or use the short form
rcast --fs

# Show help
rcast --help

Architecture

• internal/config: configuration and env overrides
• internal/netutil: network helpers (IPv4 selection)
• internal/uuid: device UUID persistence
• internal/state: player and session state (thread-safe)
• internal/player: IINA and macOS system volume control
• internal/upnp: SOAP helpers, service descriptions, AVTransport/RenderingControl handlers
• internal/httpserver: HTTP routes and handlers
• internal/ssdp: SSDP announce and M-SEARCH responder

License

MIT