node-resampler

PCM audio sample rate conversion for Node.js

Requirements

You must have libresample installed.

• Debian/Ubuntu via Apt:

$ sudo apt-get install libresample1-dev

• OS X - Install via homebrew (not yet in master):

$ brew install https://raw.github.com/xdissent/homebrew/d4f55ba336d66473e7bf167901a0c575c0c4ae17/Library/Formula/libresample.rb

Installation

Install with npm:

$ npm install resampler

or via git:

$ npm install git+https://github.com/xdissent/node-resampler.git

Usage

The resampler module exports a stream.Transform subclass:

var Resampler = require('resampler');

// Pass the input and output sample rates to the constructor:
var resampler = new Resampler(44100, 22050);

// Optionally choose low quality:
// var resampler = new Resampler(44100, 22050, Resampler.QUALITY_LO);

// Treat it like any other transform stream:
process.stdin.pipe(resampler).pipe(process.stdout);
// $ cat audio.pcm | node resample.js > resampled.pcm

Examples

Lofi-ify by downsampling by a ridiculous factor:

Resampler = require 'resampler'

downer = Resampler.new 44100, 1337
upper = Resampler.new 1337, 44100

process.stdin.pipe(downer).pipe(upper).pipe(process.stdout)
# $ cat audio.pcm | coffee lofi.coffee > lofi.pcm

FAQ

• Why not SRC libsamplerate?

  Because it's GPL.