<?php
/**
* Copyright (c) 2008 - Lorenzo Simionato
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the
* GNU General Public License (GPL) Version 2, June 1991,
* which accompanies this distribution, and is available at:
* http://www.opensource.org/licenses/gpl-license.php
*
*
* flacTags:
* A simple class that parses FLAC files.
* It can retrive easily the Vorbis Comment Data Block
* So you can get infos like Title, Author, Album, Comments...
* from any .flac file
*
*
* Date: October 2008
* Version: 0.2.1
* Author: Lorenzo Simionato
* Email: lorenzo [AT] simionato [dot] org
**/
class flacTags {
var $file_name; // File name
var $v_string; // Vendor string
var $comments; // Comments array
var $errorMessage; // Error message
// CONSTRUCTOR
function flacTags($inputfile) {
$this->file_name = $inputfile;
$this->errorMessage="";
$this->v_string="";
$this->comments=null;
}
// READ THE FILE
// return false if an error occured
function readTags() {
$file = fopen($this->file_name, "rb");
if($file == false) {
$this->errorMessage="Error opening file";
return false;
}
// Check if is a FLAC file
if(fread($file,4)!="fLaC") {
$this->errorMessage="Not valid FLAC file";
return false;
}
// Search for the VORBIS_COMMENT BLOCK
$found=false;
$last=false;
while(!$found && !$last) {
$block=fread($file,1); //get block header
if($block==false) {
$this->errorMessage="Not valid FLAC file";
return false;
}
$block=ord($block);
if($block & 128) // if first bit=1, this is the last block
$last=true;
$block=$block & 127; // get last 7 bits
if($block==4) // if 4, this is the vorbis comment block
$found=true;
$sizes=fread($file,3); //get size of the block
$size=ord($sizes[0]) << 16;
$size+=ord($sizes[1]) << 8;
$size+=ord($sizes[2]);
if(!$found)
fseek($file,$size,SEEK_CUR);
}
if(!$found) {
$this->errorMessage="Vorbis comment not found";
return false;
}
//Retrive vorbis block
//get vendor string size
$vsize=fread($file,4);
$vsize=$this->convert($vsize);
$vstr=fread($file,$vsize);
if($vstr==false) {
$this->errorMessage="Not valid FLAC file";
return false;
}
$this->v_string=$vstr;
//get numbers of comments
$csize=fread($file,4);
$csize=$this->convert($csize);
//read comments
for($i=0;$i<$csize;$i++) {
//get comment length
$cosize=fread($file,4);
$cosize=$this->convert($cosize);
//get comment value
$comment=fread($file,$cosize);
$pos=strpos($comment,"=");
if($pos==false) {
$this->errorMessage="Not valid FLAC file";
return false;
}
$field=substr($comment,0,$pos);
$value=substr($comment,$pos+1);
if(!isset($this->comments[$field]))
$this->comments[$field]=$value;
else if(is_array($this->comments[$field]))
$this->comments[$field][count($this->comments[$field])]=$value;
else {
$temp=$this->comments[$field];
$this->comments[$field]=array();
$this->comments[$field][0]=$temp;
$this->comments[$field][1]=$value;
}
}
fclose($file);
return true;
}
// get a comment
function getComment($name) {
return $this->comments[$name];
}
// get an array with all comments
function getAllComments() {
return $this->comments;
}
// get the vendor string
function getVendorString() {
return $this->v_string;
}
// get the error message
function getError() {
return $this->errorMessage;
}
// Internal function
function convert($s) {
$size=ord($s[0]);
$size+=ord($s[1]) << 8;
$size+=ord($s[2]) << 16;
$size+=ord($s[3]) << 24;
return $size;
}
}
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