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

There is actually a library that can run at client-side, attempting to fetch just enough of the MP3 to read the ID3 tags:

http://github.com/aadsm/JavaScript-ID3-Reader

or

Try

HTML File API.

http://lostechies.com/derickbailey/2013/09/23/getting-audio-file-information-with-htmls-file-api-and-audio-element/