Asynchronously loading music and sound effects to play via Web Audio API for arcade.ly games

loading-arcadely-game-sounds-music.js

function _initialiseSoundEffects() {
    _loadSounds(soundConfiguration.sounds, true);
    _loadSounds(soundConfiguration.music, false);
}

function _loadSounds(sounds, areSfx) {
    for (var soundIndex = 0, soundCount = sounds.length; soundIndex < soundCount; ++soundIndex) {
        var sound = sounds[soundIndex];

        if (areSfx) {
            sound.elementIndex = 0;                        
        }

        service[sound.id] = sound;
        sound.gain = context.createGain();
        sound.gain.gain.value = sound.volume * soundConfiguration.sfxMasterVolume;
        sound.gain.connect(context.destination);

        _loadSound(sound);
    }
}

function _loadSound(sound) {
    var request = new XMLHttpRequest();
    request.open(
        'GET',
        os.isPhone && sound.srcLowQuality
            ? sound.srcLowQuality
            : sound.src,
        true);
    request.responseType = 'arraybuffer';
    request.onload = function () {
        context.decodeAudioData(request.response, function(buffer) {
            sound.buffer = buffer;
        });
    };
    request.send();
}

/*
This code is licensed under the terms of the MIT License as described
in LICENSE.txt.

Copyright (c) 2015 - 2017 Bart Read, arcade.ly (https://arcade.ly),
and bartread.com Ltd (http://www.bartread.com/)

The soundConfiguration service is a per-game service, implemented by
games at https://arcade.ly, that provides configuration for sound
effects and music to the sfx service, thus allowing them to be played.
*/