stream.js

/**
 * @module audio-speaker
 *
 * Wraps node-speaker to ensure format.
 *
 */
'use strict';

var inherits = require('inherits');
var Through = require('audio-through');

var NodeSpeaker;
try {
	NodeSpeaker = require('speaker');
} catch (e) {
	console.warn('`speaker` package was not found. Using `audio-sink` instead.');
	NodeSpeaker = require('audio-sink');
}

/**
 * Speaker is just a format wrapper for node-speaker,
 * as node-speaker doesn’t support any input format in some platforms, like windows.
 * So we need to force the most safe format.
 *
 * @constructor
 */
function AudioSpeaker (opts) {
	if (!(this instanceof AudioSpeaker)) {
		return new AudioSpeaker(opts);
	}

	Through.call(this, opts);

	//create node-speaker with default options - the most cross-platform case
	this.speaker = new NodeSpeaker({
		channels: this.channels
	});

	this.pipe(this.speaker);
}

inherits(AudioSpeaker, Through);


/**
 * Predefined format for node-speaker
 */
Object.assign(AudioSpeaker.prototype, {
	float: false,
	interleaved: true,
	bitDepth: 16,
	signed: true
});


module.exports = AudioSpeaker;