wavepot/wavepot

var audioCtx=new AudioContext(),buffers=[],length=0;
function waitForBuffers(){
    if(buffers.length==length){ //Done.
        console.log("Done loading buffers.");
        fileInput.remove();
        //playYourSoundHere(buffers);
    }else{ //Retry and wait.
        console.log(buffers.length+"/"+length);
        setTimeout(waitForBuffers,100);
    }
}
function openAudioFile(event){
    length=event.target.files.length;
    var readers=[],current=0;
    for(var i=0;i<event.target.files.length;i++){
        readers[i]=new FileReader();
        readers[i].onload=function(){
            audioCtx.decodeAudioData(readers[current].result,buffer=>{
                buffers.push(buffer);
            });
            current++;
        };
        readers[i].readAsArrayBuffer(event.target.files[i]);
    }
    waitForBuffers();
};
var fileInput=document.createElement("input");
fileInput.setAttribute("type","file");
fileInput.setAttribute("accept","audio/*");
fileInput.setAttribute("multiple","");
document.body.appendChild(fileInput);
fileInput.addEventListener("change",openAudioFile,false);