Actionscript class

I need Actionscript class to read/write ID3 tags (MP3). We can't use standart class for writing tags, so the class must read a mp3 file as bytearray, parse it and has ability to modify (and add) all id3 tags values. The class must support ID3v1, ID3v2.3, ID3v2.4. Class will be used in Flex Air application.