A protocol bridge and control hub

Connect MIDI, OSC, DMX, MQTT, serial, HTTP, WebSocket, Bluetooth LE and more: convert messages from one to another, clean and rescale them, and keep the bridge running on a small computer. Free and open-source, on Windows, macOS, Linux and Raspberry Pi.

Download ossia score 3.9.0 Try it in your browser Read the documentation

Free and open-source (GPLv3) · Windows, macOS, Linux, Raspberry Pi and web browser

Most projects mix equipment that speaks different languages: a MIDI controller, a lighting desk on Art-Net, sensors on serial or MQTT, software on OSC. ossia score sits in the middle: every device becomes a tree of parameters, and any parameter can drive any other.

What you can do

Many protocols in one place: OSC over UDP, TCP, WebSocket and serial, OSCQuery, MIDI (virtual ports, and network ports provided by the operating system), DMX in and out over Art-Net, sACN and USB interfaces, MQTT, CoAP, HTTP, WebSocket, serial, Bluetooth LE, LSL, and receiving CAN bus data on Linux (devices).
Tracking and control: PosiStageNet, RTTrP, OpenTrackIO, TUIO, gamepads, Leap Motion and depth cameras as inputs; Bitfocus Companion modules from the package manager to drive AV equipment (tracking, Companion).
Map without programming: connect parameters with curves, scale, smooth and filter them (deadzone, noise gate, hysteresis, debounce), combine several inputs into one (mapping overview, value filter).
Permanent mappings: the mapper device keeps a bridge running even when no score is playing, with mappings written in JavaScript (mapper device).
Your own protocols: describe a device with a text or binary protocol in a short script, with framings such as SLIP, COBS, STX/ETX or size prefixes, over TCP, UDP, serial or Bluetooth (QML protocols).
Discovery: find OSC devices on the network with Bonjour/Zeroconf, browse OSCQuery devices, and publish your own parameters the same way (OSCQuery).
Many devices at once: OSC address patterns apply one value to a whole group of parameters (pattern matching).
Always on: headless mode on a PC or a Raspberry Pi, and device configurations that can be exported and reused (headless mode).

Bridging needs, and how ossia score answers them

What you need	How ossia score does it
A MIDI controller driving software that only speaks OSC, or the reverse	Drag a MIDI parameter onto an OSC one, with a curve and a range in between.
Sensors on serial, MQTT or Bluetooth LE controlling lights or sound	All are devices in the same tree, mapped to DMX, OSC or the built-in audio and video.
A device with its own text or binary protocol	A short script describes it once, then it behaves like any other device.
A bridge that runs on its own, all the time	The mapper device works without playing a score, headless on a Raspberry Pi.
Timing as well as translation	The same project can sequence, delay and automate the messages on a timeline (see the OSC, MIDI and DMX timeline).

Download ossia score 3.9.0 Try it in your browser Read the documentation

Free and open-source (GPLv3) · Windows, macOS, Linux, Raspberry Pi and web browser

More ways to use ossia score

Stage and music

Show control — Cues, scenes and timecode for theatre, concerts and events.
Live electronic music — Synths, drum machines, sampler, step sequencers and plug-ins, in sync with MIDI clock, timecode and visuals.
Spatial audio — DBAP, GBAP and trajectories over any loudspeaker layout, up to 1024 channels, and control of spatialisation renderers.
Dance and interactive theatre — Pose detection, depth cameras, sensors and tracking drive sound, video and light, inside cues and scenes.
Contemporary music and live electronics — Interactive scores that wait for the performers, cues from pedals, live processing and spatial sound.

Video and light

Video, mapping and VJing — Video playback, multi-projector mapping, shaders, 3D and NDI, synchronised with sound and light.
DMX lighting and LEDs — Art-Net, sACN and DMX USB with a fixture library, LED pixel mapping, all in sync with sound and video.
Generative art — Shaders, 3D, gaussian splats and live coding, performed live or rendered frame by frame.
Recording and streaming — Cameras, SDI, NDI and SRT in; ProRes or MP4 recording, RTMP streaming and NDI or Spout out.

Spaces and experiences

Interactive installations — Sensors, cameras and tracking, sound and video, running unattended on a PC or a Raspberry Pi.
Museums and exhibitions — Exhibits that run all day without staff, with monitoring, a staff control panel and kiosk apps.
Escape rooms and attractions — Puzzles, props and sensors driving sound, video and lights, with game logic and a game master panel.
Kinetic art and robotics — Motors, pumps and robots written on a timeline, reacting to sensors, in sync with sound, video and lights.

Tools and research

OSC, MIDI and DMX timeline — Automate any OSC, MIDI or DMX parameter on an interactive timeline, with triggers and conditions.
Visual programming — Patch audio, video and interaction with nodes and a timeline, and run your Pure Data patches.
Real-time AI — Pose detection, depth from a webcam, real-time image generation, language models and machine learning by example, run locally.
Research, sonification and biosignals — LSL, HDF5 and CSV data, sonification, biofeedback, and sessions recorded and replayed on a timeline.
Teaching and workshops — One free tool for sound, video, light, sensors and code, on every OS, in the browser and on Raspberry Pi.
Custom apps — Package a project with your own interface as an app for Windows, macOS, Linux or the web.

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