是否有可能获得mp3的比特率? [英] Is it possible to get bitrate of mp3?

问题描述

我的Chrome扩展程序显示了指向 .mp3 文件的链接的列表，我需要获取每个元素的比特率.我该如何计算?

My Chrome extension shows a list of links to .mp3 files and I need to get the bitrate for each element. How can I calculate this?

更新

解决了.

推荐答案

通过以下简单的AJAX请求解决了该问题:

Solved it with this simple AJAX request:

var audioLink = document.querySelector('.my_audio_link_class');
var durationBlock = document.querySelector('.element_with_duration_in_text_class').innerText.split(':'); //it has string '1:36' for example and i create new array with minutes and seconds
var duration = durationBlock[0]*60 + +durationBlock[1]; //convert minutes into seconds and convert string with second into integer, then summarize them

function (audioLink, duration) {
var xmlhttp = new XMLHttpRequest();
xmlhttp.overrideMimeType('text/xml');

xmlhttp.onreadystatechange = function () {
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
        var size = xmlhttp.getResponseHeader('Content-Length');//get file size
        var kbit=size/128;//calculate bytes to kbit
    var kbps= Math.ceil(Math.round(kbit/duration)/16)*16;
    console.log(kbps);
    }
};
xmlhttp.open("HEAD", audioLink, true);
xmlhttp.send();
}

希望它对某人有帮助，并为我的英语不好而感到抱歉.

Hope it helps someone and sorry for my bad english.

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