Node.js native bindings to libmp3lame & libmpg123
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Add support for x87 targets
Latest commit ca36aeb Jun 30, 2017


NodeJS native bindings to libmp3lame & libmpg123

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For all your async streaming MP3 encoding/decoding needs, there's node-lame! This module hooks into libmp3lame, the library that the lame command uses, to provide Encoder and Decoder streams to NodeJS.


node-lame comes bundled with its own copy of libmp3lame and libmpg123, so there's no need to have them installed on your system.

Simply compile and install node-lame using npm:

$ npm install lame


Here's an example of using node-lame to encode some raw PCM data coming from process.stdin to an MP3 file that gets piped to process.stdout:

var lame = require('lame');

// create the Encoder instance
var encoder = new lame.Encoder({
  // input
  channels: 2,        // 2 channels (left and right)
  bitDepth: 16,       // 16-bit samples
  sampleRate: 44100,  // 44,100 Hz sample rate

  // output
  bitRate: 128,
  outSampleRate: 22050,

// raw PCM data from stdin gets piped into the encoder

// the generated MP3 file gets piped to stdout

See the examples directory for some more example code.


Decoder class

The Decoder class is a Stream subclass that accepts MP3 data written to it, and outputs raw PCM data. It also emits a "format" event when the format of the MP3 file is determined (usually right at the beginning).

Encoder class

The Encoder class is a Stream subclass that accepts raw PCM data written to it, and outputs a valid MP3 file. You must specify the PCM data format when creating the encoder instance. Only 16-bit signed samples are currently supported (rescale before passing to the encoder if necessary)...