node-multi's Introduction

node-multi

Distributed audio performance using node.js, socket.io and the HTML5 WebAudio API.

Install

 npm install
 mkdir static
 mkdir static/audio

Note that you'll have to put your IP address in master.html, slave.html and slave_mobile.html (this will be templated in the future). You can either edit the included config file to point to remote mp3 files or drop your own mp3 files in static/audio that will be served with Express (see issues).

Web Audio is currently supported in Google Chrome, desktop Safari, Mobile Safari (on iOS 6) and the WebKit nightlies, I believe.

TODO: fix latency issues (possibly via multiple ping and latency compensation), use nginx to serve static content

Issues

Latency

There are significant issues with clients beginning play at different times, sometimes up to 500 ms. I'm actively working on this. Currently, when a client loads the page it will phone home to the server 10 times and calculate the average latency. When the master sends a play event, each client requests a latency-adjusted play event from the server, which is currently 1000 ms minus the individual recorded client latency. Currently nothing is being done to account for latency. Working on it.

Static file serving

I had some problems with Express getting overwhelmed serving large mp3s to many clients. Might be better to use remote files, hence the included config.example.js.

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node-multi's Issues

Set up proxy for using remote audio files

To my understanding (limited) XMLHttpRequest is not cool with cross-domain requests. This kills the remote mp3 loading.

listener listing on /master is broken

Reloading causes the numbers to change incorrectly...

Figure out a way to account for server to master/slave latency

Currently setting up events at 1000ms-determined latency to be executed clientside using setTimeout.

This is bad, for a number of reason. setTimeout queues a function to be executed some time after the time specified, which is not what we need at all.

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