open-dis / disintercomexample

Example that makes use of the DIS intercom PDUs from a web page

DISIntercomExample

Example that makes use of the DIS intercom PDUs from a web page. This is a non-working work in progress.

HTML5 allows access to the microphone on desktops. So why not grab the audio, stuff it into a DIS intercom PDU, and send it? Likewise receive DIS audio and play it on the desktop speakers. It's a cheap and easy way to get web-based interoperability with the DIS intercom PDUs with no extra hardware. The web page can connect to a web server via websockets, and the web server can be connected to a conventional ethernet TCP/IP network interface. This all means that web clients should be able to interoperate with existing DIS intercom applications.

Implementation Notes

The W3C audio APIs expect the html and javascript to be served up from a real http server, so for development purposes I've included a nodejs static web server in the distribution. Install nodejs from https://nodejs.org , then type

npm install connect serve-static
node server.js

This downloads the files necessary for nodejs to run a web server, then starts it. The server.js file is the implementation of the web server. The html and javascript files are served from the 'content' directory on port 8282. You can change this by editing the server.js file. Connect to the web server at http://localhost:8282.

This application makes use of the javascript implementation of DIS, available at http://github.com/open-dis/open-dis/javascript . The files are already present in the content directory.

The W3C specification for media capture is here:

https://w3c.github.io/mediacapture-main/getusermedia.html

WebRTC is here:

https://webrtc.org/