ericroth85/musquito

An audio engine for HTML5 based games and interactive websites

musquito

musquito is an audio engine created using Web Audio API for HTML5 games and interactive websites. It provides a simple abstraction to create and play sounds easier.

Below are some of the core features supported by the library.

• Simple API to create and play sounds
• Supports variety of codecs
• Supports audio sprites
• Fading
• Caching

Browser Support

• Google Chrome
• Firefox
• Safari
• Opera
• Microsoft Edge

Installation

At this time musquito is available only in npm and you can install it using the below command.

npm install musquito --save

You can also directly reference files available from the distribution folder.

<script src="musquito/dist/musquito-1.0.0.min.js"></script>

"Hello World" example

A simple example of how to create and play a gun fire sound.

ES6 and above

import $buzz from 'musquito';

const buzz = $buzz('gunfire.mp3');

buzz.play();

Classic JavaScript

var buzz = $buzz('gunfire.mp3');

buzz.play();

Advanced example

The below example shows how you can pass additional parameters like volume, rate and event handlers.

const buzz = $buzz({
  src: ['gunfire.mp3', 'gunfire.wav'],
  volume: 0.5,
  rate: 2,
  onplaystart: () => console.log('Playback started'),
  onplayend: () => console.log('Playback ended')
});

buzz.play();

Using sprites

Audio Sprites are like image sprites concatenates multiple small sounds in a single file. You can create audio sprite using this tool.

Below is an example of how to use sprites.

const buzz = $buzz({
  src: 'gamesprite.mp3',
  sprite:{
    'gun': [0, 0.48],
    'bomb': [2, 2.42],
    'greenade': [4, 4.67]
  }
});

buzz.play('gun');
buzz.play('bomb');

Fading Sounds

You can fade the volume of a playing sound linearly or exponentially as shown below.

const buzz = $buzz({
  src: 'bg.mp3'
});

buzz.play();
...

buzz.fade(0, 3);

API

$buzz function

$buzz(args: string|Array<string>|object)

$buzz is the single API that helps you to create and manage sounds. It's a function that returns a Buzz object. The Buzz object helps to control group of sounds created for a single audio source.

You can pass a single audio source, array of audio sources or an object. If an array of audio sources is passed then the first compatible one is picked for playing. If you need to pass additional information like initial volume, playback speed then you need to pass an object.

The different options you can pass in arguments object for the $buzz function.

Name	Type	Required	Default	Description
src	string, Array	yes		Single or array of audio sources. If an array of audio sources is passed then the first compatible one is picked for playing.
id	number	no	Auto-generated	The unique identifier for the Buzz object.
volume	number	no	1.0	The initial volume of the sound. The value should be from 0.0 to 1.0.
rate	number	no	1.0	The initial playback speed. The value should be from 0.5 to 5.0.
loop	boolean	no	false	Pass true to play the sound repeatedly.
muted	boolean	no	false	Pass true to keep the sound muted initially.
preload	boolean	no	false	Pass true to pre-load the sound.
autoplay	boolean	no	false	Pass true to play the sound at-once created.
format	string, Array	no	false	Single or array of audio formats for the passed audio sources.
sprite	object	no		The sprite definition object that contains the starting and ending positions of each sound embedded in the sprite.
onload	function	no		The event handler for "load" event.
onunload	function	no		The event handler for "unload" event.
onplaystart	function	no		The event handler for "playstart" event.
onplayend	function	no		The event handler for "playend" event.
onstop	function	no		The event handler for "stop" event.
onpause	function	no		The event handler for "pause" event.
onmute	function	no		The event handler for "mute" event.
onvolume	function	no		The event handler for "volume" event.
onrate	function	no		The event handler for "rate" event.
onseek	function	no		The event handler for "seek" event.
onerror	function	no		The event handler for "error" event.
ondestroy	function	no		The event handler for "destroy" event.

Buzz object methods

Method	Returns	Description
load()	Buzz	Loads the audio buffer.
play(soundOrId?: string, number)	Buzz	Plays a new sound or the passed sound defined in the sprite or the sound that belongs to the passed id.
pause(id?: number)	Buzz	Pauses the sound belongs to the passed id or all the sounds belongs to this group.
stop(id?: number)	Buzz	Stops the sound belongs to the passed id or all the sounds belongs to this group.
mute(id?: number)	Buzz	Mutes the sound belongs to the passed id or all the sounds belongs to this group.
unmute(id?: number)	Buzz	Un-mutes the sound belongs to the passed id or all the sounds belongs to this group.
volume(volume?: number, id?: number)	Buzz, number	Gets/sets the volume of the passed sound or the group. The passed value should be from 0.0 to 1.0.
rate(rate?: number, id?: number)	Buzz, number	Gets/sets the rate of the passed sound or the group. The passed value should be from 0.5 to 5.0.
seek(id: number, seek?: number)	Buzz, number	Gets/sets the current playback position of the sound.
loop(loop?: boolean, id?: number)	Buzz, boolean	Gets/sets the looping behavior of a sound or the group.
fade(to: number, duration: number, type = 'linear', id?: number)	Buzz	Fades the volume of a playing sound or all sounds belongs to the group.
fadeStop(id?: number)	Buzz	Stops the current running fade of the passed sound or all sounds belongs to the group.
playing(id: number)	boolean	Returns true if the passed sound is playing.
muted(id?: number)	boolean	Returns true if the passed sound is muted or the group is muted.
state(id?: number)	BuzzState, SoundState	Returns the state of the passed sound or the group.
duration(id?: number)	number	Returns the duration of the passed sound or the total duration of the sound.
unload()	Buzz	Unloads the loaded audio buffer.
destroy()	Buzz	Stops and destroys all the sounds belong to this group and release other dependencies.
on(eventName: string, handler: function, once = false, id?: number)	Buzz	Subscribes to an event for the sound or the group.
off(eventName: string, handler: function, id?: number)	Buzz	Un-subscribes from an event for the sound or the group.
id()	number	Returns the unique id of the sound.
loadState()	LoadState	Returns the audio resource loading status.
isLoaded()	boolean	Returns true if the audio source is loaded.
sound(id: number)	Sound	Returns the sound for the passed id.
alive(id: number)	boolean	Returns true if the passed sound exists.

$buzz static / global methods

These are wrapper methods of engine that helps to control the audio globally. You can invoke this method by $buzz.[methodname](args).

Method	Returns	Description
setup(args?: object)	$buzz	Sets-up the audio engine.
load(urls: string, Array)	Promise	Loads single or multiple audio resources into audio buffers and returns them.
unload(urls: string, Array)	$buzz	Unloads single or multiple loaded audio buffers from cache.
mute()	$buzz	Mutes the engine.
unmute()	$buzz	Un-mutes the engine.
volume(vol?: number)	$buzz, number	Gets/sets the volume for the audio engine that controls global volume for all sounds.
stop()	$buzz	Stops all the currently playing sounds.
suspend()	$buzz	Stops all the playing sounds and suspends the engine immediately.
resume()	$buzz	Resumes the engine from the suspended mode.
terminate()	$buzz	Shuts down the engine.
muted()	boolean	Returns whether the engine is currently muted or not.
state()	EngineState	Returns the state of the engine.
context()	AudioContext	Returns the created audio context.
isAudioAvailable()	boolean	Returns true if Web Audio API is available.
on(eventName: string, handler: function, once = false)	$buzz	Subscribes to an event.
off(eventName: string, handler: function)	$buzz	Un-subscribes from an event.

License

MIT