AES67 Visualizer

A cross-platform AES67 / ST2110-30 / RAVENNA / Dante audio stream visualization and monitoring application.

Features

• SAP/mDNS Discovery: Automatic detection of AES67, RAVENNA and Dante streams
• Dante ARC: Query Dante devices directly (name, model, TX/RX channels, channel names)
• Device Panel: Per-device view with expandable TX/RX channel list
• Monitoring Wall: Drag-and-drop streams to 16-slot monitoring wall
• Real-time Meters: dBFS level meters with peak hold
• Audio Playback: Listen to any stream with channel selection
• PTP Monitoring: Track IEEE 1588 grandmaster and lock status per stream
• Multi-language: 8 languages (EN, FR, DE, ZH, JA, KO, ES, IT)
• Cross-platform: Windows, macOS, Linux

Tech Stack

• Frontend: React 18 + TypeScript + Vite + TailwindCSS
• Desktop: Electron 33
• Audio: Audify (RtAudio bindings)
• SDP Parsing: sdp-transform
• Drag & Drop: @dnd-kit/core

Installation

git clone https://github.com/dewiweb/aes67_visualizer.git
cd aes67_visualizer
npm install
npm run dev:app       # development
npm run build:electron  # production

Architecture

electron/
├── main.js                  # Electron main process / IPC orchestration
├── preload.cjs              # Context bridge API
├── processes/
│   ├── discovery.cjs        # mDNS + ARC + RTSP discovery (child process)
│   ├── sdp.cjs              # SAP/SDP multicast listener (child process)
│   ├── audio.cjs            # RTP audio playback (child process)
│   ├── meters.cjs           # Level monitoring (child process)
│   └── ptp.cjs              # PTP IEEE 1588 monitoring (child process)
└── protocols/
    ├── arc.cjs              # Dante ARC binary UDP protocol (port 4440)
    ├── rtsp.cjs             # RAVENNA RTSP stream discovery (RFC 2326)
    ├── mdns.cjs              # mDNS/DNS-SD — dns-sd (Windows/macOS) or avahi-browse (Linux)
    ├── sap.cjs              # SAP RFC 2974 multicast socket
    ├── aes67.cjs            # AES67 SDP validation & PTP parsing
    └── ravenna.cjs          # RAVENNA device helpers & RTSP path builder
src/
├── components/
│   ├── DevicePanel.tsx      # Per-device view with ARC channel names
│   ├── MonitoringWall.tsx   # 16-slot monitoring wall
│   └── ...
└── types/index.ts           # TypeScript definitions incl. DanteDevice

Protocol Support

Audio Formats

Format	Support
L24 (24-bit PCM)	✅
L16 (16-bit PCM)	✅
1–64 channels	✅
44.1 / 48 / 88.2 / 96 / 192 kHz	✅

Protocol Matrix

Standard	Discovery	Audio Transport	Control	PTP
AES67	SAP 239.255.255.255:9875	RTP multicast 239.x.x.x	—	PTPv2 IEEE 1588-2008
RAVENNA	mDNS _ravenna._tcp + SAP	RTP multicast 239.x.x.x:5004	RTSP :554	PTPv2 IEEE 1588-2008
Dante native	mDNS _netaudio-arc._udp	RTP unicast/multicast 239.x.x.x:4321	ARC UDP :4440	PTPv1 IEEE 1588-2002
Dante AES67	SAP 239.255.255.255:9875	RTP multicast 239.x.x.x	ARC UDP :4440	PTPv2 IEEE 1588-2008
ST2110-30	SDP out-of-band	RTP multicast	NMOS IS-05	PTPv2 IEEE 1588-2008

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Network Port Reference

AES67 / RAVENNA

Port	Protocol	Direction	Usage
9875 UDP	SAP RFC 2974	multicast 239.255.255.255	Stream announcements (SDP)
5353 UDP	mDNS	multicast 224.0.0.251	Device discovery DNS-SD
554 TCP	RTSP RFC 2326	unicast	SDP retrieval (/by-name/<stream>, /by-id/<n>)
5004 UDP	RTP RFC 3550	multicast 239.x.x.x	Audio transport (default RAVENNA port)
319 UDP	PTPv2 event	multicast 224.0.1.129	PTP sync, delay-req messages
320 UDP	PTPv2 general	multicast 224.0.1.129	PTP announce, follow-up messages

Dante Native

Port	Protocol	Direction	Usage
5353 UDP	mDNS	multicast 224.0.0.251	Device discovery (_netaudio-arc._udp, _netaudio-chan._udp, etc.)
4440 UDP	ARC (binary)	unicast	Device control: name, channels, subscriptions
4455 UDP	DBCP flows	unicast	RTP flow creation/deletion (start_code=0x1102)
8700 UDP	Settings	unicast	Device settings (sample rate, latency…)
8702 UDP	Device info	multicast 224.0.0.231	Device info, routing state
8708 UDP	Heartbeat	multicast 224.0.0.233	Keep-alive
8751 UDP	Metering	multicast 224.0.0.231	VU-meter data
8800 UDP	CMC clock	unicast	Clock domain management
4321 UDP	RTP	multicast 239.x.x.x	Audio transport (native Dante multicast)
319/320 UDP	PTPv1	multicast 224.0.1.129	IEEE 1588-2002 — incompatible with PTPv2

Dante AES67 mode (differences vs native)

Aspect	Dante native	Dante AES67
Stream announcement	mDNS only	+ SAP 239.255.255.255:9875 (keyword k=Dante)
Audio transport	unicast + multicast	multicast only
Audio port	4321 (fixed)	dynamic (from SDP)
PTP version	PTPv1 (1588-2002)	PTPv2 (1588-2008)
Codec	proprietary	L16/L24, 48kHz only
Activation	—	MESSAGE_TYPE_AES67_CONTROL via ARC :4440

⚠️ PTP conflict risk: Dante native (PTPv1) and RAVENNA/AES67 (PTPv2) cannot share a PTP grandmaster. Running both on the same network segment without VLAN isolation can destabilize clock sync for all devices.

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Dante ARC Protocol

The ARC (Audio Routing Control) protocol uses a binary UDP format on port 4440.

Packet header (10 bytes, big-endian):

start_code(2=0x27FF) + total_length(2) + seqnum(2) + opcode(2) + result_code(2) + content[]

Key opcodes:

Opcode	Description
0x1000	Channel count (TX + RX)
0x1002	Device name
0x1003	Device info (board, revision, hostname)
0x2000	TX channel list (paginated)
0x2010	TX channel friendly names
0x3000	RX channel list + subscription status
0x3010	Set channel subscriptions (routing)
0x2201	Create multicast TX flow
0x3200	Query RX flows

Result codes: 0x0001 = OK, 0x8112 = OK (more pages), 0x0022 = error

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Sources & References

Open Source Projects Studied

All projects below were used as protocol and architecture references only — no source code was copied. This project remains under MIT License and is fully compatible with all referenced works.

Project	Licence	Language	What it provided
philhartung/aes67-monitor	MIT	JS/Electron	SAP socket (socket.bind(9875)), SAP announcement (announceStream → 239.255.255.255:9875), SAP session ID from o= line (MD5 hash), stream timeout 5min, sdp-transform library, RTP playback via audify/RtAudio, jitter buffer, multicast bind client.bind(5004)
Digisynthetic/aes67-stream-monitor	Proprietary	JS/Electron	Architecture reference only: SAP SapDiscovery class, Monitoring Wall UI concept, i18n approach
chris-ritsen/network-audio-controller	MIT	Python	Dante ARC protocol opcodes, packet format, const.py
teodly/inferno (mirror of lumifaza/inferno)	GPL-3.0	Rust	ARC packet header layout, pagination (0x8112), flows control port 4455, mDNS service types _netaudio-chan, _netaudio-bund — protocol reference only, no code included
soundondigital/ravennakit	AGPLv3	C++	RAVENNA RTSP paths (/by-name/, /by-id/), RTP port 5004, PTPv2 profiles, DNS-SD service types — protocol/spec reference only, no code included
martim01/pam	MIT	C++	AES67/RAVENNA/ST2110 monitor — confirms RTP port 5004, RTSP port 554, PTP domain from a=ts-refclk/a=clock-domain SDP attributes, PTP hybrid mode, AM824 codec
bondagit/aes67-linux-daemon	GPL-3.0	C++	AES67 Linux daemon: SAP+mDNS+RTSP, REST API, React WebUI — protocol reference only, no code included

Standards & Specifications

Standard	Description
AES67-2023	Audio over IP interoperability standard (L16/L24, PTPv2, SAP/SDP)
IEEE 1588-2008 (PTPv2)	Precision Time Protocol v2 — used by AES67, RAVENNA, Dante AES67
IEEE 1588-2002 (PTPv1)	Precision Time Protocol v1 — used by Dante native
RFC 2974	Session Announcement Protocol (SAP) — multicast 239.255.255.255:9875
RFC 2326	Real Time Streaming Protocol (RTSP) — used by RAVENNA
RFC 3550	RTP: A Transport Protocol for Real-Time Applications
SMPTE ST 2110-30	Professional Media over Managed IP Networks — Audio

Test Devices (local network)

Device	Protocol	IP	Notes
Lawo MADI4	RAVENNA/AES67	192.168.100.228	64ch MADI, announces via SAP
Lawo MC²36	RAVENNA/AES67	192.168.100.229	Console, multiple SAP streams
Shure AD4Q-I	Dante (AES67)	192.168.100.213	64TX/1RX, ARC responds with channel names (HF1–HF64)
Shure AD4Q-II	Dante (AES67)	192.168.100.214	64TX/1RX, ARC responds with channel names (HF5–HF8…)

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License

MIT License — See LICENSE file for details.