AV-Live

Live coding audio-visual performance system built around a SuperCollider sound engine, an openFrameworks oscilloscope visualizer driven by a real Hantek 6022BL USB scope, a macOS menubar launcher, and a Metal-native pose / body-mesh visualizer that listens to the same audio bus.

15 scripted demoparties · ~47 fullscreen visuals (26 3D parametric meshes + 18 procedural shaders + 3 dedicated C++ scenes) · 5 OS pixel-art shaders · 14 retro OS logos · 33 GLSL shader pairs (~65 files) · 1099 SynthDefs across 368 tracks (23 albums × 16) · 11 real-world data feeds · 7 pose-estimation backends — all reactive to the audio physically passing through the scope probes.

Top-level architecture

ASCII (always renders):

                                  AV-LIVE
              ┌──────────────────────────────────────────┐
              │        AVLiveLauncher.app (menubar)      │
              └────┬────────────┬─────────────┬──────┬───┘
                   │            │             │      │
           ┌───────▼──────┐ ┌───▼────┐ ┌──────▼───┐ ┌▼────────────┐
           │ sclang +     │ │ node   │ │ oscope-of│ │ data_only_viz│
           │ scsynth      │ │ web ui │ │ (oF C++) │ │ (Metal py)   │
           │ sound_algo/  │ │ :3000  │ │ Hantek   │ │ webcam pose  │
           │ 1099 SynthDef│ │        │ │ FFT 2048 │ │ 7 backends   │
           │ 368 tracks   │ │        │ │ ~47 bg   │ │ NLF / SMPL   │
           └───────┬──────┘ └───┬────┘ └──────┬───┘ └───┬─────────┘
              :57121 OSC    :3000 HTTP    :57123 OSC      :57123 OSC out
                   │            │             ▲              │
                   └────────────┴─────────────┴──────────────┘
                                       ▲
                          data_feeds/ (11 sources OSC)

Mermaid (rendered on GitHub):

flowchart TB
    L["AVLiveLauncher.app (menubar SwiftUI)"]
    SC["sound_algo/<br/>sclang + scsynth<br/>1099 SynthDefs · 368 tracks"]
    W["sound_algo/web/<br/>node :3000"]
    OF["oscope-of/<br/>openFrameworks C++<br/>Hantek 6022BL · FFT 2048<br/>~47 backgrounds · 33 shader pairs"]
    DOV["data_only_viz/<br/>Metal natif (pyobjc)<br/>7 pose backends · NLF/SMPL mesh"]
    DF["data_feeds/<br/>11 real-world sources"]
    WR["web_realart/<br/>WebGPU + Web Audio + Hydra"]

    L -->|spawn| SC
    L -->|spawn| W
    L -->|spawn| OF
    L -->|spawn| DOV

    SC -->|OSC :57123| OF
    SC -->|OSC :57123| DOV
    DOV -->|OSC pose →| SC
    DF -->|OSC :57121| SC
    DF -->|OSC :57123| OF
    DF -->|OSC :57124| WR

    W <-->|WebSocket| SC

Features

🎵 Sound engine — sound_algo/

• 1099 SynthDefs auto-loaded (acid_v1..v19, bass808_v1..v19, lead_v1..v19, kicks, drums, world, fx, master) — 1059 synth + 40 fx confirmed
• 23 albums × 16 tracks = 368 tracks ready to play (album letters A-W)
• Subtle humanize : timing ±3.5 ms, velocity ±10 %, micro-detune ±3 cents per note
• Synth rotation : cycles through 19 versions of each SynthDef every 8 notes
• Auto layering : 3 voice layers parallel to melody/harmony/acid
• 15 album signatures with per-album palette, FX drives, layer config
• OSC bridge to oscope-of and data_only_viz on :57123 (kick/snare/melody/lead/bass/bpm/album)
• Web UI on :3000 with live coding control surface (Express + WebSocket bridge)
• 18 example scripts in sound_algo/examples/00..17_*.scd

📺 Visualizer — oscope-of/

• Hantek 6022BL real USB oscilloscope capture (1–48 MS/s, 2 channels, 8-bit) via libusb bulk transfers
• AudioAnalyzer : downsamples Hantek to 48 kHz, FFT 2048 (~23 Hz/bin), bands bass / lowMid / mid / treble / kick / snare
• ~47 fullscreen backgrounds (enum BgKind in src/ofApp.h:98-113, 53 enum values) :
  • 26 ModelVis 3D parametric meshes : Möbius, Klein, trefoil, twisted torus, Lucy, helix, catenoid, Boys, lemniscate, Penrose, sphere, icosahedron, dodecahedron, torus, supershape, Lorenz attractor, Hopf, Enneper, Hopf link, gear, cone, pyramid, rose3D, geosphere, DNA helix, hyperboloid
  • 18 ShaderVis procedural : metaballs, voronoi, twister bars, plasma FBM, rotozoom, truchet kaleido, SDF tunnel raymarched, KIFS fractal, fire, perspective grid, tunnel cubes, caustics, vortex, octahedron chrome, Boing ball, Mode7, plasma C64, dot tunnel
  • 3 dedicated C++ scenes : TunnelVis, VectorCubesVis, SphereWaveVis
  • + starfield (DemoFx) and + live webcam (WebcamVis)
• 5 OS pixel-art shaders : Workbench (Amiga), Mac OS Classic, Atari Fuji, Ocean Loader, Win95
• 14 OS logo PNGs with demoscene FX (mirror reflection, ghost trail, RGB chroma, twister wobble, scanlines, glitch tear) : Win 1.0/3.11/95, Lotus 1-2-3, MS-DOS, Apple Rainbow, Amiga WB, NeXTSTEP, BeOS, OS/2 Warp, IRIX, ZX Spectrum, C64, Atari
• 10 scroller styles : Classic, Wavy3D, Rainbow, Mirror, Glitch, Neon, Cascade, Chrome, Bouncy, Squashy
• Demoscene FX : sine scroller from greetings.txt, copper bars, logo bobs, starfield with motion blur
• 33 GLSL shader pairs (~65 files) : 14 backgrounds + 5 OS pixel-art + 9 post-FX/transitions + 5 mesh/3D + shared utilities (postfx.vert, transition.vert), all GLSL 150 GL 3.2 core
• Post-FX shader chain : ACES tone-map, bloom, chromatic aberration, hue rotation, scanlines, vignette, grain, pixelate, kaleido, feedback FBO, glitch displacement

🤸 Pose / body mesh — data_only_viz/ (new)

Metal-native fullscreen visualizer (pyobjc, MTKView, ~60 fps) driven by webcam pose detection. Listens to the same OSC bus as oscope-of (:57123) so audio sync and data feeds drive its shaders identically, and ships pose features back to sound_algo on :57121 to close the loop (the dancer steers the synths).

• 7 pose backends (drop-in via pyproject.toml extras) :

  Backend	Module	Model	Status
  MediaPipe Holistic	holistic.py	33 body + 478 face + 42 hand kp	stable
  YOLOv8-pose	pose.py	Ultralytics, 17 COCO kp	stable (MPS)
  Apple Vision	apple_vision_pose.py	VNDetectHumanBodyPoseRequest (ANE)	macOS only
  Core ML pose	coreml_pose.py	YOLO11n-pose CoreML, AVCapture zero-copy	stable
  DETRPose	detrpose.py	DETR transformer, COCO 17 kp, multi-person	manual clone + ckpt
  NLF	nlf_worker.py	SMPL body mesh, 6890 vertices, TorchScript	CUDA-only (CPU/MPS bricked)
  MediaPipe multi	multi.py	Pose/Face/Hand ×4 personnes	stable

• Renderer : Metal pipelines compiled at runtime (shaders/*.metal), bg_pipeline (full-screen FBM) + skel_pipeline (skeleton lines). SMPL face topology shipped as binary (mesh_topology.py) for RealityKit-compatible mesh rendering.

• Tracker : One Euro Filter on keypoints + IoU multi-person association (scipy.linear_sum_assignment, ByteTrack-like).

• OSC out → sclang :57121 : /pose/count, /pose/center, /pose/wrist, /pose/head, /pose/sho_span, /pose/limb_span.

• Thread-safe state : state.py exposes State.lock() ; dataclasses PoseKp, NLFPerson (vertices_3d, joints_3d), and a multi-person container.

🎬 Demoparties — 15 narrative demos

Each demoparty is a multi-act scripted show with unique scroller text, background sequence, scroller style, and SuperCollider album track :

Key	Demo	Acts	Album
1/&	AMIGA TRIBUTE	6	M chiptune_madness
2/é	C64 LOWLIFE	5	N phonk
3/"	ACID JOURNEY	8	A acid_journey
4/'	TUNNEL VISION	5	P industrial
5/(	FREQUENCIES	7	I liquid_dnb
6/§	GLITCH WORLD	6	V glitch_idm
7/è	AMBIENT VOID	7	J ambient_cinematic
8/!	RAVE	7	T hardcore_gabber
9/ç	MEMORY LANE	8	U vocal_trance
0/à	GREETINGS	18	W dub_techno
F6	FRACTAL DREAMS	7	O asian_cinematic
F7	INFERNO	6	E vietnam_hard
F8	OUTRUN	6	R synthwave
F9	CUBE STORM	8	Q neurofunk_dnb
F10	GRAND FINAL	8	L future_garage

Each act lasts 12–55 s, transitions between acts trigger flash + glitch postfx + audio swap. Demos loop on their first act after the last.

🎛 Live FX control (Mac AZERTY FR friendly)

• a z e r t y u i o p — 10 background scenes (BoingBall, Tunnel, Metaballs, Voronoi, Twister, KIFS, Fire, Mode7, Octahedron, PlasmaC64)
• s d f g h j k l m + w x c v b n , ; — 17 FX parameters (speed, kick, roll, pan, curve, tile X/Z, dir lerp, bloom, chroma, kaleido, scanlines, pixelate, hue, grain, vignette, saturation)
• ↑ ↓ — adjust selected parameter (× 1.20 / × 0.83 multipliers, or ± 0.05 absolute)
• : — reset all FX
• \ or * — toggle beat-sync (queue demo trigger to next kick)
• q / Esc — exit narrative, default to SphereWave 3D live background
• Espace — manual glitch pulse
• F1–F5 — fullscreen / GUI / postFx / autoglitch / reload shaders

🌐 Real-world data feeds — data_feeds/ + web_realart/

• 11 feed modules in data_feeds/feeds/ ingested by bridge.py and broadcast as OSC /data/<source>/<sub> to SC (:57121), oF (:57123) and the web bridge (:57124) : USGS quakes · NOAA SWPC (solar wind, Bz IMF, Kp, X-ray flares) · Mainsfrequenz.de · RTE eCO2mix · Blitzortung lightning · OpenSky ADS-B · Bluesky firehose · Bitcoin mempool · GitHub events · GCN astrophysics · YOLOv8 webcam pose
• SC presets sound_algo/examples/16_data_feeds.scd and 17_data_feeds_more.scd map each source to synthesis : Schumann cavity drone (foudre), aurora additive pad (Bz/wind/Kp), Netzfrequenz pulse kick, RTE 8-op carbon FM, OpenSky granular swarm
• Web standalone web_realart/ ports the visualizers and synths to the browser for real.art.saillant.cc :
  • WebGPU + three.js TSL (r171) globe with quake/strike/flight particles (auto-fallback WebGL2)
  • Web Audio ports of 5 SC SynthDef presets (cavity, mix, geo, aurora, pulse)
  • Hydra with 7 data-driven patches (aurora, quake, lightning, flightmap, gridpulse, solarwind, bskyrain)
  • All three layers share feeds_client.js (window.feeds) over one WebSocket

📡 Audio reactivity pipeline

ASCII :

Hantek probes → bulk USB → ScopeRing CH1/CH2 (1-48 MS/s, 8-bit)
                                ↓
                        AudioAnalyzer.update()
                                ↓
                    Downsample box-filter → 48 kHz mono
                                ↓
                  Hann window + FFT 2048 (23 Hz/bin)
                                ↓
        bands : bass(20-200) / lowMid(200-800) /
                mid(800-3200) / treble(3200-16000) /
                kick (transient bass) / snare (transient mid+treble)
                                ↓
                    drives every visualizer parameter

Mermaid :

flowchart LR
    H["Hantek 6022BL<br/>2× probes"] -->|bulk USB| R["ScopeRing<br/>CH1/CH2 1–48 MS/s 8-bit"]
    R --> A["AudioAnalyzer.update()"]
    A --> D["Downsample box-filter<br/>→ 48 kHz mono"]
    D --> F["Hann + FFT 2048<br/>~23 Hz/bin"]
    F --> B["Bands :<br/>bass · lowMid · mid · treble<br/>+ kick & snare transients"]
    B --> V["Visualizer params<br/>(backgrounds, post-FX, scroller)"]

🤸 Pose pipeline — data_only_viz (new)

flowchart LR
    CAM["Webcam<br/>AVCaptureSession"] --> BE{"Backend<br/>(pyproject extras)"}
    BE -->|holistic| MP["MediaPipe Holistic"]
    BE -->|pose| YO["YOLOv8-pose"]
    BE -->|coreml_pose| CM["CoreML ANE"]
    BE -->|apple_vision_pose| AV["Apple Vision"]
    BE -->|detrpose| DT["DETRPose"]
    BE -->|nlf| NLF["NLF SMPL 6890v<br/>CUDA only"]
    MP & YO & CM & AV & DT & NLF --> KP["Keypoints / Mesh"]
    KP --> EF["One Euro Filter"]
    EF --> TR["Tracker IoU<br/>linear_sum_assignment"]
    TR --> ST["State (lock)<br/>PoseKp · NLFPerson"]
    ST --> MET["Metal renderer<br/>bg + skel pipelines"]
    ST --> OSC["OSC /pose/* →<br/>sclang :57121"]
    SCIN["sclang OSC :57123<br/>/sync /data"] --> ST

Quick start

macOS install

# 1. Clone
git clone https://github.com/electron-rare/AV-Live.git
cd AV-Live

# 2. Dependencies
brew install --cask supercollider
brew install libusb node uv
# openFrameworks 0.12 : https://openframeworks.cc/download/  (extract to ~/of)

# 3. Build the launcher (universal binary arm64+x86_64)
cd launcher && bash build.sh

# 4. Build oscope-of (one-time symlink for oF make)
ln -s "$PWD/../oscope-of" ~/of/apps/myApps/oscope-of
cd ~/of/apps/myApps/oscope-of
make OF_ROOT=$HOME/of -j4 Release

# 5. (optional) data_only_viz Metal pose viz
cd ../../../data_only_viz
uv sync                       # base (Metal + OSC + tracker)
uv sync --extra pose          # + MediaPipe / YOLOv8 / Ultralytics
# uv sync --extra nlf         # + NLF SMPL body mesh (CUDA only)
uv run python -m data_only_viz.main

# 6. Run the whole stack
open AV-Live/launcher/build/AVLiveLauncher.app

The launcher autostarts sclang + oscope-of + node (web UI) and can spawn data_only_viz from the menubar mode picker. Open the menubar icon for status, logs, restart controls.

Without Hantek hardware

oscope-of works without the scope plugged in. It falls back to synthesized signals from the OSC /sync/* metadata sent by sound_algo. You lose the audio-derived FFT but the demoscene visuals + narrative demos all still play. data_only_viz runs identically since it only needs the OSC bus + a webcam.

Demoparty mode

Press a digit (1–9, 0) or F-key (F6–F10) to launch a 1–3 minute scripted demoparty. Each one is a journey through audio + visual transitions, with greetings to the demoscene legends along the way (Fairlight, Razor 1911, ASD, Conspiracy, Farbrausch, TBL, Mercury, TPOLM, Loonies, Hokuto Force, IQ, Knighty, Smash, Gargaj…).

The 0 GREETINGS demo cycles through 18 acts including Boing Ball, plasma C64, dot tunnel, twister bars, copper bars, fractal KIFS, Möbius topology, then a parade of OS logos (Win 1.0, Lotus 1-2-3, Atari, Apple, OS/2 Warp, IRIX, ZX Spectrum), ending on a roll call of demoscene groups.

Architecture details

Component	Path	Tech
Sound engine	sound_algo/	SuperCollider 3.14+, ~12k LOC .scd
Sound web UI	sound_algo/web/	Node Express + WebSocket bridge OSC↔HTTP
Visualizer	oscope-of/	openFrameworks 0.12, GLSL 150 GL 3.2 core, ~6k LOC C++
Pose / body mesh	data_only_viz/	Python 3.11+ / uv, Metal natif via pyobjc, 7 pose backends
Launcher	launcher/	SwiftUI universal app, sentinel-based restart, ProcessManager @MainActor
Real-world feeds	data_feeds/	Python uv, 11 async feed modules, bridge.py OSC fan-out
Web standalone	web_realart/	Node Express + ws, WebGPU three.js r171 + Web Audio + Hydra
Audio FFT	oscope-of/src/AudioAnalyzer.{h,cpp}	downsample + Hann + FFT 2048
3D models	oscope-of/bin/data/models/	27 PLY parametric meshes
Sprites	oscope-of/bin/data/sprites/	14 PNG OS logos + 5 SVG sources
Shaders	oscope-of/bin/data/shaders/	33 GLSL pairs (~65 files) frag+vert
Metal shaders	data_only_viz/shaders/	.metal, runtime-compiled

OSC ports : scsynth :57110 · sclang :57121 · node web :57122 · oscope-of :57123 (source: oscope-of/bin/data/settings.json) · web_realart :57124 · http :3000.

License

GPL-3.0-or-later. See LICENSE.

Credits & homages

Built by L'Électron Rare (Clément Saillant). Greetings to all the live coders, the demoscene legends, the openFrameworks community, the SuperCollider community, the Saillans festival 2026 artists, and everyone keeping the phosphor alive.

The GREETINGS scroller in oscope-of/bin/data/sprites/greetings.txt is the soul of the project — edit it freely and make it yours.

*** Press 1-0 + F6-F10 to start a demoparty ***
*** Keep the scene alive — 1985 to ∞ ***