node-lame
NodeJS native bindings to libmp3lame & libmpg123
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.
Installation
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
Example
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 = ;// create the Encoder instancevar encoder =// inputchannels: 2 // 2 channels (left and right)bitDepth: 16 // 16-bit samplessampleRate: 44100 // 44,100 Hz sample rate// outputbitRate: 128outSampleRate: 22050mode: lameSTEREO // STEREO (default), JOINTSTEREO, DUALCHANNEL or MONO;// raw PCM data from stdin gets piped into the encoderprocessstdin;// the generated MP3 file gets piped to stdoutencoder;
See the examples
directory for some more example code.
API
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)...