pico.js

Pico.js is a JavaScript library for real-time audio processing that runs a browser and node.js.

Reference and Demo

English | 日本語

Installation

browser

<script src="pico.js"></script>

node.js

$ npm install node-pico

Example

var pico = require("node-pico");

function sinetone(freq) {
    var phase = 0,
        phaseStep = freq / pico.samplerate;
    return {
        process: function(L, R) {
            for (var i = 0; i < L.length; i++) {
                L[i] = R[i] = Math.sin(6.28318 * phase) * 0.25;
                phase += phaseStep;
            }
        }
    };
}

pico.play(sinetone(880));

Change log

2013 02 13 - 0.0.8

• Performance improvement
• Fixed: a better? Float32Array (for IE9)

2013 01 15 - 0.0.7

• Bugfix

2013 01 15 - 0.0.6

• Fixed: stream size for WindowsXP (8192->4096)

2013 01 15 - 0.0.5

• Fixed: stream size for WindowsXP/Linux (1024->8192)
• Fixed: interval of processing for Firefox (using mozCurrentSampleOffset)

2012 12 11 - 0.0.4

• Added fake Float32Array (for IE9)
• Fixed: default samplerate (webkit=auto, moz,node.js=44.1KHz, flash=22.05KHz)

2012 12 08 - 0.0.3

• Fixed issue #2, added support cross-platform node.js

2012 12 07 - 0.0.2

• Fixed issue #1, the sound does not stop when switching browser tabs (Firefox)

2012 12 05 - 0.0.1

• First release