Build a Javascript library for mp3 and mp4 player. -- 2

I need a library which is written in native Javascript can decode mp3 and mp4 file in the browser. (Note: Some Javascript Class will be mention below) Main features: - Could play mp3/mp4 online (stream with http/ws protocol) and offline (input is ArrayBuffer). - [Important] Could get access to every frame (contain frame header and frame data) of the mp3/mp4 file before it is decoded. Because I have to modify some bit of data in my mp3/mp4. Here is some requirements for this library : (content with * apply for both mp3 and mp4) - [*] Has core media player method such as : play(), pause(), stop(), seek()... - [*] Has core media player event such as : onEnd, onProgress, onBuffer, onMetadata, onError... - [*] Using WebWorker for decoding progress, because Javascript is single thread, it is easy to get lag if we won't use WebWorker. - [*] Play instance, it don't have to wait for decoding progress of all the file before play. - [mp4] Has simple UI written in HTML, it will have some simple controls and "Full Screen" toggle button.