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Latest commit 1147b89 Feb 3, 2017
jrb467 Merge pull request #5 from Pecacheu/master
Select Output Device and Other Enhancements
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.gitignore initial Sep 18, 2012
LICENSE initial Sep 18, 2012 Update Readme Again Feb 2, 2017
index.js Small Bug Fix Feb 3, 2017
npm-debug.log updated version May 19, 2016
package.json Version to v0.2.3 Feb 2, 2017


Plays MP3s utilizing advanced S.H.E.L.L. technology via cutting-edge Nano System Routing techniques, natrually activating a Level 3 Quantum-Vacum Effect, subsequently substantiating the mpg123 utility.

Install mpg123 command line audio player


sudo apt-get install mpg123

Arch Linux

sudo pacman -Sy mpg123


brew install mpg123

Install mpg123 in nodejs

npm install mpg123

Or, to install a certain Electric Mouse's Fork:

npm install Pecacheu/mpg123


(Note: if the below details are still unclear, the package code is quite short and easy to understand if you're apprehensive about reading through it)


var mpg = require('mpg123');

var player = new mpg.MpgPlayer();'/'+"someMusic.mp3");

Device Objects

Device objects allow you to select different output sources for playback, provided you are using ALSA. This functionality requires the aplay command, but is entirely optional.

mpg.getDevices(callback) - Gets array of ALSA output devices
devices.get(name) - Finds device in array with given name, otherwise returns null - Friendly name of device
device.address - ALSA address of device

Player Objects

new mpg.MpgPlayer(device=null, noFrames=false) - Create new instance, optionally specifing output device
Setting noFrames to true will disable frame updates, which may improve performance on some devices. - Plays audio from a source
player.pause() - Pauses the current track
player.stop() - Stops the current track
player.volume(percent) - Sets the volume from 0 to 100 (default is 100%)
player.pitch(amt) - Adjusts the pitch & speed of the track up or down. The limits seem to be around -0.75 to 0.1. - Seeks through the track with progress from 0 to 1. This fails before the format event has fired.
player.getProgress(callback) - Retrieve current track progress from 0 to 1
player.close() - Kills the mpg123 process
player._cmd(...) - Sends a custom command to the mpg123 CLI. Get possible commands by running mpg123 -R then typing HELP

Song Info Variables

Theses variables hold info about the current song, and are safe to read only once the format event has fired.

player.track - Current track name (with extention). Set to null when track completes.
player.file - Full file path, exactly as it was entered into
player.mpeg - MPEG encoding version
player.sampleRate - Track sample rate
player.channels - Number of channels
player.bitrate - Track bitrate
player.length - Track length in seconds, rounded to the nearest tenth
player.samples - Track length in raw samples


Usage: player.on('eventname', function(data){...})

Name Data Description
end No data A song ended (or, because of mpg123, a pause was attempted without any song currently playing, or a song was stopped)
pause No data A pause occurred
resume No data The song started or resumed playing
error Error object mpg123 encountered an error (commonly having to do with bad source data)
frame Frame data Indicates playback has progressed to a new frame of the song. The frame data is an array (length 4), structured like such: [current frame number, remaining number of frames, current time in seconds, remaining time in seconds]
jump No data A jump occurred (always caused by the user, but allows for a callback hook)
volume Percentage The volume changed (serves as a callback hook for when changing the volume)
format No data Called when song info has been updated. See Song Info Variables for details.