Función php para leer ID3

id3.php

<?php

function readTags($file) {
   $fp = fopen($file, "r");
   $start = fread($fp, 3);
   $size = filesize($file);
   fseek($fp, $size-128);
   $end = fread($fp, 128);

   if (strpos($start, "ID3") === 0) {
      $tags = readID3v2($fp);
      if (($tags["artist"] == "" || $tags["title"] == "") && strpos($end, "TAG") === 0) {
         $tags2 = readID3v1($end);
         if ($tags["artist"] == "" || $tags2["artist"] != "") {
            $tags["artist"] = $tags2["artist"];
         }
         if ($tags["title"] == "" || $tags2["title"] != "") {
            $tags["title"] = $tags2["title"];
         }
      }
   }
   else if (strpos($end, "TAG") === 0) $tags = readID3v1($end);
   else $tags = array("artist" => "", "title" => "", "album" => "", "year" => "");
   fclose($fp);
   foreach ($tags as $key=>$value) {
      if (strlen($tags[$key]) == 1) $tags[$key] = "";
   }
   return $tags;
}

function readID3v1($data) {
   $tags = array();
   $data = substr($data, 3, 97);
   $data = str_split($data, 30);
   $tags = array("artist" => $data[1], "title" => $data[0], "album" => $data[2], "year" => $data[3]);
   return $tags;
}

function readID3v2($fp) {
   $tags = array();
   fseek($fp, 0);
   $data = fread($fp, 2048);
   $pos = 3;
   fseek($fp, $pos);
   while (fread($fp, 1) != "v") {
      $pos++;
      fseek($fp, $pos);
   }
   $pos++;
   if ($pos > 12) {
      $pos = 3;
      fseek($fp, $pos);
      while (fread($fp, 1) != "T" && fread($fp, 1) != "C") {
         $pos++;
         fseek($fp, $pos);
      }
      fseek($fp, $pos);
   }
   $header = "";
   $a = array();
   $c = 0;
   while($c < 20) {
      $header = fread($fp, 4);
      fseek($fp, $pos+7);
      $len = ord(fread($fp, 1));
      fseek($fp, $pos+10);
      if ($len > 0) $value = fread($fp, $len);
      else $value = "";
      $pos = $pos + 10 + $len;
      fseek($fp, $pos);
      //echo $header." - > ".$value."<br>";
      $orig = $value;
      if (preg_match("/[]/", $value)) $value = substr(mb_convert_encoding(substr($value, 1), "windows-1251", "Unicode"), 1);
      if (preg_match("/[]/", $value)) $value = "";
      if (strpos($value, "ÿþ") == 1) $value = substr($value, 3);
      $a[$header] = $value;
      $c++;
   }
   if (!isset($a["TIT1"]) && isset($a["TIT2"])) $a["TIT1"] = $a["TIT2"];
   if (!isset($a["TPE1"]) && isset($a["TPE2"])) $a["TPE1"] = $a["TPE2"];
   if (!isset($a["TIT1"])) $a["TIT1"] = "";
   if (!isset($a["TPE1"])) $a["TPE1"] = "";
   if (!isset($a["TALB"])) $a["TALB"] = "";
   if (!isset($a["TYER"])) $a["TYER"] = "";
   $tags = array("artist" => $a["TPE1"], "title" => $a["TIT1"], "album" => $a["TALB"], "year" => $a["TYER"]);
   return $tags;
}

?>