cubeb

This is a node.js native binding module to the cross-platform audio library <a href="https://github.com/kinetiknz/cubeb">cubeb</a>.

node-cubeb

This is a node.js native binding module to the cross-platform audio library cubeb.

The purpose of this module is to allow you to write to the user's soundcard.

You need to install cubeb in order for node-cubeb to work. Refer to directions provided in cubeb on how to do that.

IMPORTANT:

If you're on Linux, make sure that you have /usr/local/lib in your library path.

After installing cubeb, installing node-cubeb works like installing any other library in npm:

$ npm install cubeb

cubeb is quite a low level library, so that applies to node-cubeb as well. cubeb has two main concepts, contexts and streams. Ideally, you should use one context per program, while the context can have multiple streams. In order to setup a basic example of playing back pure noise, you would do as follows:

 
var CUBEB = require('cubeb')
 
var SAMPLE_FORMAT = CUBEB.SAMPLE_INT16LE
var CHANNEL_COUNT = 1
var SAMPLE_RATE = 44100
var BUFFER_SIZE = 4096
var PLAY_TIME = 4000
var LATENCY = 250
var CTX_NAME = "my cubeb context"
var STREAM_NAME = "noisy stream"
 
function stateCallback (stateID) {
/* here you can report the state */
}
 
function dataCallback (frameCount) {
/* int16 is 2 bytes, doh */
stream.write(new Buffer(frameCount * 2))
/* releases used buffers */
stream.release()
 
/*
 note that we get the noise for free because
 node buffers aren't initialized to zero.
*/
}
 
var ctx = new CUBEB.Context(CTX_NAME)
var stream = new CUBEB.Stream(
ctx,
STREAM_NAME,
SAMPLE_FORMAT,
CHANNEL_COUNT,
SAMPLE_RATE,
BUFFER_SIZE,
LATENCY,
datacb,
statecb
)
 
stream.start()