Posts: 64
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I came across some PHP code that reads Id3 tag information from .mp3 files. When returning the values of the specified Id3 tag information, it adds the following characters which I suspect to be an encoding problem: ÿþ.
A screen shot:
The three pages that make up the entire code:
Page 1 - id3.class.php
PHP Code:
<?php
/***********************************************************
* Class: ID3
* Version: 1.0
* Date: Janeiro 2004
* Author: Tadeu F. Oliveira
* Contact: tadeu_fo@yahoo.com.br
* Use: Extract ID3 Tag information from mp3 files
***********************************************************
Exemple
require('error.inc.php');
$nome_arq = 'Blind Guardian - Bright Eyes.mp3';
$myId3 = new ID3($nome_arq);
if ($myId3->getInfo()){
echo('<HTML>');
echo('<a href= "'.$nome_arq.'">Clique para baixar: </a><br>');
echo('<table border=1>
<tr>
<td><strong>Artista</strong></td>
<td><strong>Titulo</strong></font></div></td>
<td><strong>Trilha</strong></font></div></td>
<td><strong>Album/Ano</strong></font></div></td>
<td><strong>Gênero</strong></font></div></td>
<td><strong>Comentários</strong></font></div></td>
</tr>
<tr>
<td>'. $myId3->getArtist() . ' </td>
<td>'. $myId3->getTitle() . ' </td>
<td>'. $myId3->getTrack() . ' </td>
<td>'. $myId3->getAlbum() . '/'.$myId3->getYear().' </td>
<td>'. $myId3->getGender() . ' </td>
<td>'. $myId3->tags['COMM']. ' </td>
</tr>
</table>');
echo('</HTML>');
}else{
echo($errors[$myId3->last_error_num]);
}
*/
class ID3{
var $file_name=''; //full path to the file
//the sugestion is that this path should be a
//relative path
var $tags; //array with ID3 tags extracted from the file
var $last_error_num=0; //keep the number of the last error ocurred
var $tags_count = 0; // the number of elements at the tags array
/*********************/
/**private functions**/
/*********************/
function hex2bin($data) {
//thankz for the one who wrote this function
//If iknew your name I would say it here
$len = strlen($data);
for($i=0;$i<$len;$i+=2) {
$newdata .= pack("C",hexdec(substr($data,$i,2)));
}
return $newdata;
}
function get_frame_size($fourBytes){
$tamanho[0] = str_pad(base_convert(substr($fourBytes,0,2),16,2),7,0,STR_PAD_LEFT);
$tamanho[1] = str_pad(base_convert(substr($fourBytes,2,2),16,2),7,0,STR_PAD_LEFT);
$tamanho[2] = str_pad(base_convert(substr($fourBytes,4,2),16,2),7,0,STR_PAD_LEFT);
$tamanho[3] = str_pad(base_convert(substr($fourBytes,6,2),16,2),7,0,STR_PAD_LEFT);
$total = $tamanho[0].$tamanho[1].$tamanho[2].$tamanho[3];
$tamanho[0] = substr($total,0,8);
$tamanho[1] = substr($total,8,8);
$tamanho[2] = substr($total,16,8);
$tamanho[3] = substr($total,24,8);
$total = $tamanho[0].$tamanho[1].$tamanho[2].$tamanho[3];
$total = base_convert($total,2,10);
return $total;
}
function extractTags($text,&$tags){
$size = -1;//inicializando diferente de zero para não sair do while
while ((strlen($text) != 0) and ($size != 0)){
//while there are tags to read and they have a meaning
//while existem tags a serem tratadas e essas tags tem conteudo
$ID = substr($text,0,4);
$aux = substr($text,4,4);
$aux = bin2hex($aux);
$size = $this->get_frame_size($aux);
$flags = substr($text,8,2);
$info = substr($text,11,$size-1);
if ($size != 0){
$tags[$ID] = $info;
$this->tags_count++;
}
$text = substr($text,10+$size,strlen($text));
}
}
/********************/
/**public functions**/
/********************/
/**Constructor**/
function ID3($file_name){
$this->file_name = $file_name;
$this->last_error_num = 0;
}
/**Read the file and put the TAGS
content on $this->tags array**/
function getInfo(){
if ($this->file_name != ''){
$mp3 = @fopen($this->file_name,"r");
$header = @fread($mp3,10);
if (!$header) {
$this->last_error_num = 2;
return false;
die();
}
if (substr($header,0,3) != "ID3"){
$this->last_error_num = 3;
return false;
die();
}
$header = bin2hex($header);
$version = base_convert(substr($header,6,2),16,10).".".base_convert(substr($header,8,2),16,10);
$flags = base_convert(substr($header,10,2),16,2);
$flags = str_pad($flags,8,0,STR_PAD_LEFT);
if ($flags[7] == 1){
//echo('with Unsynchronisation<br>');
}
if ($flags[6] == 1){
//echo('with Extended header<br>');
}
if ($flags[5] == 1){//Esperimental tag
$this->last_error_num = 4;
return false;
die();
}
$total = $this->get_frame_size(substr($header,12,8));
$text = @fread($mp3,$total);
fclose($mp3);
$this->extractTags($text,$this->tags);
}
else{
$this->last_error_num = 1;//file not set
return false;
die();
}
return true;
}
/*************
* PUBLIC
* Functions to get information
* from the ID3 tag
**************/
function getArtist(){
if (array_key_exists('TPE1',$this->tags)){
return $this->tags['TPE1'];
}else{
$this->last_error_num = 5;
return false;
}
}
function getTrack(){
if (array_key_exists('TRCK',$this->tags)){
return $this->tags['TRCK'];
}else{
$this->last_error_num = 5;
return false;
}
}
function getTitle(){
if (array_key_exists('TIT2',$this->tags)){
return $this->tags['TIT2'];
}else{
$this->last_error_num = 5;
return false;
}
}
function getAlbum(){
if (array_key_exists('TALB',$this->tags)){
return $this->tags['TALB'];
}else{
$this->last_error_num = 5;
return false;
}
}
function getYear(){
if (array_key_exists('TYER',$this->tags)){
return $this->tags['TYER'];
}else{
$this->last_error_num = 5;
return false;
}
}
function getGender(){
if (array_key_exists('TCON',$this->tags)){
return $this->tags['TCON'];
}else{
$this->last_error_num = 5;
return false;
}
}
}
?>
Page 2 - sample.php
PHP Code:
<?php
require('error.inc.php');
require('id3.class.php');
$nome_arq = '../music/files/the all-american rejects - dirty little secret.mp3';
$myId3 = new ID3($nome_arq);
if ($myId3->getInfo()){
echo('<HTML>');
echo('<a href= "'.$nome_arq.'">Click to download: </a><br>');
echo('<table border=1>
<tr>
<td><strong>Artist</strong></td>
<td><strong>Title</strong></font></div></td>
<td><strong>Track</strong></font></div></td>
<td><strong>Album/Year</strong></font></div></td>
<td><strong>Genre</strong></font></div></td>
<td><strong>Comments</strong></font></div></td>
</tr>
<tr>
<td>'. $myId3->getArtist() . ' </td>
<td>'. $myId3->getTitle() . ' </td>
<td>'. $myId3->getTrack() . ' </td>
<td>'. $myId3->getAlbum() . '/'.$myId3->getYear().' </td>
<td>'. $myId3->getGender() . ' </td>
<td>'. $myId3->tags['COMM']. ' </td>
</tr>
</table>');
echo('</HTML>');
}else{
echo($errors[$myId3->last_error_num]);
}
?>
Page 3 - error.inc.php
PHP Code:
<?php
$errors[0] = '';//means no error. (Change it and things can become very strange)
$errors[1] = 'File Name not set';
$errors[2] = 'Unable to open MP3 file';
$errors[3] = 'ID3v2 Tag not found on this file';
$errors[4] = 'TAG not Supported';
$errors[5] = 'Tag not found(maybe you need to call getInfo() first?)';
/*$errors[0] = '';//sem erro. (Mude isto e as coisas podem ficar BEM estranhas)
$errors[1] = 'Nome do Arquivo não definido';
$errors[2] = 'Impossível encontrar arquivo .MP3';
$errors[3] = 'Tag ID3v2 Não encontrada neste arquivo';
$errors[4] = 'TAG não suportada';
$errors[5] = 'Tag não encontrada(talvez vc tenha esqquecido de chamar getInfo() antes?)';
*/
?>
Sorry about some of it being Portuguese. I converted most of it to English.
Thanks a lot!!
Moatist
__________________
Think in code; Dream in digital.
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Last edited by moatist; 06-02-2009 at 08:13 PM..
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