How to get the size and duration of an mp3 file?

Question

I need to calculate the total length of an mp3 file.

Currently I am using a PHP class which I found @ http://www.zedwood.com/article/php-calculate-duration-of-mp3.

Answer 1

Here's how you can get mp3 duration using Web Audio API:

const mp3file = 'https://raw.githubusercontent.com/prof3ssorSt3v3/media-sample-files/master/doorbell.mp3'
const audioContext = new (window.AudioContext || window.webkitAudioContext)()
const request = new XMLHttpRequest()
request.open('GET', mp3file, true)
request.responseType = 'arraybuffer'
request.onload = function() {
    audioContext.decodeAudioData(request.response,
        function(buffer) {
            let duration = buffer.duration
            console.log(duration)
            document.write(duration)
        }
    )
}
request.send()