musicplayer-api

musicplayer-api provides a simple way to implement a gapless music player using Web Audio API. It was originally meant to be used in environments such as electron but may eventually work in a browser.

Add it to your package with

npm install musicplayer-api

Example of usage

MusicPlayer = require('musicplayer-api').MusicPlayer

# The constructor automatically creates a new AudioContext
# and GainNode
player = new MusicPlayer()

# The addTrack is responsible of inserting songs in the
# playlist. It also asynchronously loads songs into memory
player.addTrack 'mymusic1.mp3'
player.addTrack 'mywav.wav'

player.play()

API Documentation

When used in node, musicplayer-api exports an object containing the MusicPlayer class. The same object is set to the mp global if used in a browser.

MusicPlayer class

Methods

player.setVolume( value )

Sets the volume to the specified value, where 0 is muted and 1 is default playback intensity.

player.getVolume()

Returns the playback intensity. Normally is 1.

player.toggleMuted()

Toggles between muted and unmuted state.

player.play()

Starts playing or resumes the playback of the current playlist.

player.stop()

Stops playing the current song in the playlist. When play is called again, the song is restarted from the beginning.

player.pause()

Suspends the playback of the current song.

player.playNext()

Skips to the next song in the playlist.

player.addTrack( path )

Adds the specified song to the playlist.

player.insertTrack( index, path )

Adds the specified song in the specified position of the playlist.

player.replaceTrack( index, path )

Replaces the specified track with another one.

player.removeTrack( index )

Removes the specified song from the playlist.

player.removeAllTracks()

Clears the playlist and stops the playback.

player.getSongDuration( index )

Returns the duration in seconds of the specifed song. If no index is provided, 0 is assumed.

player.getSongPosition()

Returns the playing position of the current song. Returns 0 if the playlist is empty or the song hasn't started yet.

player.setSongPosition( position )

Sets the playing position of the current song, expressed in seconds from the beginning. If the playback is stopped before the call, the player is started.

Events

onSongFinished

Called when a song has reached the end.

NOTE: Passes the song's path as an argument.

onPlaylistEnded

Called when the playlist has reached the end.

onPlayerStopeed

Called when the player is stopped programmatically.

onPlayerPaused

Called when the player is paused programmatically.

onTrackAdded

Called when a track is added to the playlist.

NOTE: Passes the track's path as an argument.

onTrackRemoved

Called when a track is removed from the playlist.

onTrackLoaded

Called when a track has finished loading its contents.

NOTE: Passes the track's path as an argument.

onVolumeChanged

Called when the volume is changed programmatically.

NOTE: Passes the volume's value as an argument.

onMuted

Called when the player is muted programmatically.

onUnmuted

Called when the player is unmuted programmatically.

Example

player = new MusicPlayer()
player.onVolumeChanged = (value) =>
  console.log 'Current volume: ' + value.toString()