simple song transition

webaudio-transition-tivial.js

var songInfos = [{
        url: "https://fuckingdj.blob.core.windows.net/test/Swedish%20House%20Mafia%20-%20Save%20The%20World%20(Zedd%20Remix).mp3",
    }, {
        url: "https://fuckingdj.blob.core.windows.net/test/Jewelz%20%26%20Scott%20Sparks%20feat.%20Quilla%20%E2%80%93%20Unless%20We%20Forget%20(Original%20Mix).mp3",
    }];
var song1toSong2TransitionData = {
    startTime: 72.556,
    skipBeginning: 45.824,
};
var context = new AudioContext();
function loadSong(url) {
    return fetch(url)
        .then(function (response) { return response.arrayBuffer(); })
        .then(function (arrayBuffer) { return context.decodeAudioData(arrayBuffer); })
        .then(function (audioBuffer) {
        var sourceNode = context.createBufferSource();
        sourceNode.buffer = audioBuffer;
        sourceNode.connect(context.destination);
        return sourceNode;
    });
}
Promise.all(songInfos.map(({url})=>loadSong(url)))
    .then( ([song1, song2]) => {
    var now = context.currentTime;
    song1.start(now);
    song2.start(now + song1toSong2TransitionData.startTime, song1toSong2TransitionData.skipBeginning);
});