一個解析mp3 ID3 tag 和 MPEG 信息的類

<?php
    /*
     * MP3 class
     *
     * rel. 0.1
     *
     * Copyright (c) 2000 Sumatra Solutions srl    http://www.sumatrasolutions.com
     *          Ludovico Magnocavallo    [email protected]
     *
     * License type: GNU GPL http://www.gnu.org/copyleft/gpl.html
     *
     *    Heavily inspired by
     *          Perl Apache::MP3 module (L. Stein) -- great module to create an apache-based mp3 server
     *          Perl MP3::Info (C. Nandor) -- very complicated, hard stuff but useful
     *          Java class de.vdheide.mp3 (J. Vonderheide) -- great stuff, easy to read, had to debug synchronize() method
     *
     * ID3v2 tags support not completed
     *
     * MP3 header reference at http://www.mp3-tech.org/
     *
     * // quick start:
     * $mp3 = new MP3($myfilepath);
     * $mp3->get_info();          // file info in $mp3->info array
     * $mp3->get_id3();          // id3 info in $mp3->id3 array