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node-aplay.js
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node-aplay.js
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/**
* Javascript ALSA aplay wrapper for Node.js
*
* @mantainedBy Rocco Musolino - @roccomuso
* @author Patrik Melander (lotAballs) node-aplay module
* @originalAuthor Maciej Sopyło @ KILLAHFORGE.
*
* Dependencies: sudo apt-get install alsa-base alsa-utils
* MIT License
*/
var os = require('os')
var spawn = require('child_process').spawn
var events = require('events')
var util = require('util')
var aplayExec = os.platform() === 'darwin' ? 'afplay' : 'aplay'
function Sound (opts) {
events.EventEmitter.call(this)
opts = opts || {}
this.channel = opts.channel || null
}
util.inherits(Sound, events.EventEmitter)
Sound.prototype.play = function (fileName) {
this.stopped = false
if (typeof this.process !== 'undefined') this.process.kill('SIGTERM') // avoid multiple play for the same istance
var args = []
if (this.channel) args = args.concat(['-c ' + this.channel])
args = args.concat([fileName])
this.process = spawn(aplayExec, args)
var self = this
this.process.on('exit', function (code, sig) {
self.stopped = true
if (code !== null && sig === null) {
self.emit('complete')
}
})
return this
}
Sound.prototype.stop = function () {
if (this.process) {
this.stopped = true
this.process.kill('SIGTERM')
this.emit('stop')
}
return this
}
Sound.prototype.pause = function () {
if (this.process) {
if (this.stopped) return true
this.process.kill('SIGSTOP')
this.emit('pause')
}
return this
}
Sound.prototype.resume = function () {
if (this.process) {
if (this.stopped) return this.play()
this.process.kill('SIGCONT')
this.emit('resume')
}
return this
}
Sound.prototype.channel = function (ch) {
this.channel = ch
return this
}
module.exports = Sound
// autonomous execution: node node-aplay.js my-song.wav
if (!module.parent) {
var player = new Sound()
player.play(process.argv[2])
}