一个解析mp3 ID3 tag 和 MPEG 信息的类（来自zend.com），实际应用请看这里http://feife

<?php
    /*
     * MP3 class
     *
     * rel. 0.1
     *
     * Copyright (c) 2000 Sumatra Solutions srl    http://www.sumatrasolutions.com
     *                    Ludovico Magnocavallo    ludo@sumatrasolutions.com
     *
     * 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
     * $mp3->send_pls($HTTP_HOST)        // uses physical path to file in playlist url
     * $mp3->stream()                        // streams file to browser
     *
     * $Id: mp3.php,v 1.10 2000/07/18 11:05:16 ludo Exp $
     *
     */  
    class MP3 {
        var $id3_genres_array = array(
            @#Blues@#, @#Classic Rock@#, @#Country@#, @#Dance@#, @#Disco@#, @#Funk@#, @#Grunge@#, @#Hip-Hop@#, @#Jazz@#, @#Metal@#, @#New Age@#, @#Oldies@#, @#Other@#, @#Pop@#, @#R&B@#, @#Rap@#, @#Reggae@#, @#Rock@#, @#Techno@#, @#Industrial@#,
            @#Alternative@#, @#Ska@#, @#Death Metal@#, @#Pranks@#, @#Soundtrack@#, @#Euro-Techno@#, @#Ambient@#, @#Trip-Hop@#, @#Vocal@#, @#Jazz+Funk@#, @#Fusion@#, @#Trance@#, @#Classical@#, @#Instrumental@#, @#Acid@#, @#House@#,
            @#Game@#, @#Sound Clip@#, @#Gospel@#, @#Noise@#, @#AlternRock@#, @#Bass@#, @#Soul@#, @#Punk@#, @#Space@#, @#Meditative@#, @#Instrumental Pop@#, @#Instrumental Rock@#, @#Ethnic@#, @#Gothic@#, @#Darkwave@#,
            @#Techno-Industrial@#, @#Electronic@#, @#Pop-Folk@#, @#Eurodance@#, @#Dream@#, @#Southern Rock@#, @#Comedy@#, @#Cult@#, @#Gangsta@#, @#Top 40@#, @#Christian Rap@#, @#Pop/Funk@#, @#Jungle@#, @#Native American@#, @#Cabaret@#,
            @#New Wave@#, @#Psychadelic@#, @#Rave@#, @#Showtunes@#, @#Trailer@#, @#Lo-Fi@#, @#Tribal@#, @#Acid Punk@#, @#Acid Jazz@#, @#Polka@#, @#Retro@#, @#Musical@#, @#Rock & Roll@#, @#Hard Rock@#, @#Folk@#, @#Folk/Rock@#, @#National Folk@#,
            @#Swing@#, @#Fast Fusion@#, @#Bebob@#, @#Latin@#, @#Revival@#, @#Celtic@#, @#Bluegrass@#, @#Avantgarde@#, @#Gothic Rock@#, @#Progressive Rock@#, @#Psychedelic Rock@#, @#Symphonic Rock@#, @#Slow Rock@#, @#Big Band@#,
            @#Chorus@#, @#Easy Listening@#, @#Acoustic@#, @#Humour@#, @#Speech@#, @#Chanson@#, @#Opera@#, @#Chamber Music@#, @#Sonata@#, @#Symphony@#, @#Booty Bass@#, @#Primus@#, @#Porn Groove@#, @#Satire@#, @#Slow Jam@#, @#Club@#, @#Tango@#, @#Samba@#,
            @#Folklore@#, @#Ballad@#, @#Power Ballad@#, @#Rhythmic Soul@#, @#Freestyle@#, @#Duet@#, @#Punk Rock@#, @#Drum Solo@#, @#Acapella@#, @#Euro-house@#, @#Dance Hall@#
        );
        var $info_bitrates = array(
            1    =>    array(
                1    =>    array( 0 => 0, 16 => 32, 32 => 64, 48 => 96, 64 => 128, 80 => 160, 96 => 192, 112 => 224, 128 => 256, 144 => 288, 160 => 320, 176 => 352, 192 => 384, 208 => 416, 224 => 448, 240 => false),
                2    =>    array( 0 => 0, 16 => 32, 32 => 48, 48 => 56, 64 =>  64, 80 =>  80, 96 =>  96, 112 => 112, 128 => 128, 144 => 160, 160 => 192, 176 => 224, 192 => 256, 208 => 320, 224 => 384, 240 => false),
                3    =>    array( 0 => 0, 16 => 32, 32 => 40, 48 => 48, 64 =>  56, 80 =>  64, 96 =>  80, 112 =>  96, 128 => 112, 144 => 128, 160 => 160, 176 => 192, 192 => 224, 208 => 256, 224 => 320, 240 => false)
            ),
            2    =>    array(
                1    =>    array( 0 => 0, 16 => 32, 32 => 48, 48 => 56, 64 =>  64, 80 => 80, 96 => 96, 112 => 112, 128 => 128, 144 => 144, 160 => 160, 176 => 176, 192 => 192, 208 => 224, 224 => 256, 240 => false),
                2    =>    array( 0 => 0, 16 =>  8, 32 => 16, 48 => 24, 64 =>  32, 80 => 40, 96 => 48, 112 =>  56, 128 =>  64, 144 =>  80, 160 =>  96, 176 => 112, 192 => 128, 208 => 144, 224 => 160, 240 => false),
                3    =>    array( 0 => 0, 16 =>  8, 32 => 16, 48 => 24, 64 =>  32, 80 => 40, 96 => 48, 112 =>  56, 128 =>  64, 144 =>  80, 160 =>  96, 176 => 112, 192 => 128, 208 => 144, 224 => 160, 240 => false)
            ),
        );
        var $info_versions = array(0 => "reserved", 1 => "MPEG Version 1", 2 => "MPEG Version 2", 2.5 => "MPEG Version 2.5");
        var $info_layers = array("reserved", "Layer I", "Layer II", "Layer III");
        var $info_sampling_rates = array(
            0        =>    array(0 => false, 4 => false, 8 => false, 12 => false),
            1        =>    array(0 => "44100 Hz", 4 => "48000 Hz", 8 => "32000 Hz", 12 => false),
            2        =>    array(0 => "22050 Hz", 4 => "24000 Hz", 8 => "16000 Hz", 12 => false),
            2.5    =>    array(0 => "11025 Hz", 4 => "12000 Hz", 8 => "8000 Hz", 12 => false),
        );
        var $info_channel_modes = array(0 => "stereo", 64 => "joint stereo", 128 => "dual channel", 192 => "single channel");
        var $file = "";
        var $fh = false;
        var $error = false;
        var $id3_parsed = false;
        var $id3 = array(
/*            "tag"            =>    "",
            "title"        =>    "unknown",
            "author"        =>    "unknown",
            "album"        =>    "unknown",
            "year"        =>    "unknown",
            "comment"    =>    "unknown",
            "genre_id"    =>    0,
            "genre"        =>    "unknown"
*/        );
        var $url = "";
        var $info = array();
         
        function mp3($file, $exitonerror=true) {
            if (file_exists($file)) {
                $this->file = $file;
                $this->fh = fopen($this->file,"r");
                global $HTTP_HOST, $PHP_SELF;
                $this->url = "http://$HTTP_HOST/$PHP_SELF";
            } else {
                $this->error = "No such file";
                if ($exitonerror) $this->exitonerror();
            }
        }
        function exitonerror() {
            echo($this->error);
            exit;
        }
        function set_id3($title = "", $author = "", $album = "", $year = "", $comment = "", $genre_id = 0) {
            $this->error = false;
            $this->wfh = fopen($this->file,"a");
            fseek($this->wfh, -128, SEEK_END);
            fwrite($this->wfh, pack("a3a30a30a30a4a30C1", "TAG", $title, $author, $album, $year, $comment, $genre_id), 128);
            fclose($this->wfh);
        }
        function get_id3() {
            $this->id3_parsed = true;
            fseek($this->fh, -128, SEEK_END);
            $line = fread($this->fh, 10000);
            if (preg_match("/^TAG/", $line)) {
                $this->id3 = unpack("a3tag/a30title/a30author/a30album/a4year/a30comment/C1genre_id", $line);
                $this->id3["genre"] = $this->id3_genres_array[$this->id3]["genre_id"]];
                return(true);
            } else {
                $this->error = "no idv3 tag found";
                return(false);
            }
        }
        // get_info() helper methods
        function calculate_length($id3v2_tagsize = 0) {
          $length = floor(($this->info["filesize"] - $id3v2_tagsize) / $this->info["bitrate"] * 0.008);
            $min = floor($length / 60);
            $min = strlen($min) == 1 ? "0$min" : $min;
            $sec = $length % 60;
            $sec = strlen($sec) == 1 ? "0$sec" : $sec;
            return("$min:$sec");
        }
        function get_info() {
//            $this->get_id3v2header();
            $second = $this->synchronize();
//            echo("2nd byte = $second <b>" . decbin($second) . "</b><br>");
            $third = ord(fread($this->fh, 1));
            $fourth = ord(fread($this->fh, 1));
            $this->info["version_id"] = ($second & 16) > 0 ? ( ($second & 8) > 0 ? 1 : 2 ) : ( ($second & 8) > 0 ? 0 : 2.5 );
            $this->info["version"] = $this->info_versions[ $this->info]["version_id"] ];
            $this->info["layer_id"] = ($second & 4) > 0 ? ( ($second & 2) > 0 ? 1 : 2 ) : ( ($second & 2) > 0 ? 3 : 0 );     ;
            $this->info["layer"] = $this->info_layers[ $this->info]["layer_id"] ];
            $this->info["protection"] = ($second & 1) > 0 ? "no CRC" : "CRC";
            $this->info["bitrate"] = $this->info_bitrates[ $this->info]["version_id"] ][ $this->info]["layer_id"] ][ ($third & 240) ];
            $this->info["sampling_rate"] = $this->info_sampling_rates[ $this->info]["version_id"] ][ ($third & 12)];
            $this->info["padding"] = ($third & 2) > 0 ? "on" : "off";
            $this->info["private"] = ($third & 1) > 0 ? "on" : "off";
            $this->info["channel_mode"] = $this->info_channel_modes[$fourth & 192];
            $this->info["copyright"] = ($fourth & 8) > 0 ? "on" : "off";
            $this->info["original"] = ($fourth & 4) > 0 ? "on" : "off";
            $this->info["filesize"] = filesize($this->file);
            $this->info["length"] = $this->calculate_length();
        }
        function synchronize() {
            $finished = false;
            rewind($this->fh);
            while (!$finished) {
                $skip = ord(fread($this->fh, 1));
//                echo("inside synchronize() skip = $skip <b>" . decbin($skip) . "</b><br>");
                while ($skip != 255 && !feof($this->fh)) {
                    $skip = ord(fread($this->fh, 1));
//                    echo("inside synchronize() skip = $skip <b>" . decbin($skip) . "</b><br>");
                }
                if (feof($this->fh)) {
                    $this->error("no info header found");
                    if ($exitonerror) $this->exitonerror();
                }
                $store = ord(fread($this->fh, 1));
//                echo("inside synchronize() store = $store <b>" . decbin($store) . "</b><br>");
                if ($store >= 225) {
                    $finished = true;
                } else if (feof($this->fh)) {
                    $this->error("no info header found");
                    if ($exitonerror) $this->exitonerror();
                }
            }
            return($store);
        }
        function get_id3v2header() {
            $bytes = fread($this->fh, 3);
            if ($bytes != "ID3") {
                echo("no ID3 tag");
                return(false);
            }
            // get major and minor versions
            $major = fread($this->fh, 1);
            $minor = fread($this->fh, 1);
            echo("ID3v$major.$minor");
        }
        function stream() {
            if (!$this->id3_parsed) {
                $this->get_id3();
            }
            header("ICY 200 OK\r\n");
            header("icy-notice1:This stream requires a shoutcast/icecast compatible player.<br>\r\n");
            header("icy-notice2:php MP3 class<br>\r\n");
            header("icy-name:" . (count($this->id3) > 0 ? $this->id3["title"] . " - " . $this->id3["author"] . " - " . $this->id3["album"] . " - " . $this->id3["year"] : $this->file) . "\r\n");
            header("icy-genre:" . (count($this->id3) > 0 ? $this->id3["genre"] : "unspecified") . "\r\n");
            header("icy-url:bbb\r\n");
            header("icy-pub:1\r\n");
            header("icy-br:320\r\n");
            rewind($this->fh);
            fpassthru($this->fh);
        }
        function send_playlist_header($numentries = 1) {
            header("Content-Type: audio/mpegurl;");
            echo("[playlist]\r\n\r\n");
            echo("NumberOfEntries=$numentries\r\n");
        }
        function send_pls($server) {
            $this->send_playlist_header();
            $path = "/";
            $path_array = explode("/", dirname($this->file));
            while(list($key,$val) = each($path_array)) {
                $path .= empty($val) ? "" : rawurlencode($val);
            }
            $path .= "/";
            $file = rawurlencode(preg_replace("/\.mp3$/", "", basename($this->file)));
            echo("File1=http://$server$path$file.mps\r\n");
        }
        function close() {
            @fclose($this->fh);
        }
    }

?>

原文转自：http://www.ltesting.net