Code Examples -> ID3v2 tag extractor in PHP

	Join us on FaceBook
	Submit Your Code
	Poker Tournaments
	Poker Guide for Developers
	SEO Monitor
	UpTime Monitor
	My Favorite Examples
	My Favorite Articles
	Update Your Profile

More Weber Sites
	PHP Code Search
	Web Development Forums
	Learn MySQL Playing Trivia
	PHPBB2 Templates
	Web Development Resources
	Web Development Content
	Internet Security Software

Recommended Links
	PHPClasses
	PHP Editor
	PHP Jobs
	Vision.To Design
	Ajax Tutorials
	PHP Programming Help
	PHP/MySQL Programming
	Webmaster Resources
	Webmaster Forum
	XML meta language
	website builder

Recommended
	פרייסז - הכח לקנות עובר לידיים שלך
	Texas Holdem Poker Evangelists


BACK		ADD A COMMENT		SEND TO A FRIEND		ADD TO MY FAVORITES		ADD CODE EXAMPLES		PRINT

PHP Code Examples

Title :	ID3v2 tag extractor in PHP
Categories :	PHP, Tag Extractors	Anders Bruun
Date :	Mar 01st 2001
Grade :	2 of 5 (graded 3 times)
Viewed :	8442
File :	No file for this code example.
Images :	No Images for this code example.

Search :	More code by Anders Bruun
Action :	Grade This Code Example
Tools :	My Examples List

Code

<?
/*
This file was written by Anders Bruun Olsen (anders@gerf.dk)
It is all released under the GNU GPL license and therefore free
for everybody to use.
I hope that someone will find it useful and perhaps clean it up
and make it a bit smoother..

For those in doubt, it is used by giving a filename (preferebly
with a full path) of an MP3 file containing an ID3v2 tag to
extract_id3v2().
An array is then returned containing all the frames in the tag.
*/

function rem_synchsafe ($tal)
{
        $tal = hexdec(bin2hex($tal));
        $tal1 = floor($tal/256) * 128 + ($tal%256);
        $tal2 = floor($tal1/32768) * 16384 + ($tal1%32768);
        $sluttal = floor($tal2/4194304) * 2097152 + ($tal2%4194304);
        return $sluttal;
};

function get_flags ($fp)
{
        // This function reads the flag bit and puts out something useful...
        $flags = hexdec(bin2hex(fgetc($fp)));
        if (($flags - 128) >= 0) {
                // flag a is set (Unsynchronisation)
                $flags = $flags - 128;
                $flaglist .= "a,";
        }
        if (($flags - 64) >= 0) {
                // flag b is set (Extended Header)
                $flags = $flags - 64;
                $flaglist .= "b,";
        }
        if (($flags - 32) >= 0) {
                // flag c is set (Experimental indicator)
                $flags = $flags - 32;
                $flaglist .= "c,";
        }
        if (($flags - 16) >= 0) {
                // flag d is set (Footer present)
                $flags = $flags - 16;
                $flaglist .= "d,";
        }
if (($flags - 8) >= 0) {
// flag e is set (Unused in v2.4.0)
$flags = $flags - 8;
$flaglist .= "e,";
}
if (($flags - 4) >= 0) {
// flag f is set (Unused in v2.4.0)
$flags = $flags - 4;
$flaglist .= "f,";
}
if (($flags - 2) >= 0) {
// flag g is set (Unused in v2.4.0)
$flags = $flags - 2;
$flaglist .= "g,";
}
if (($flags - 1) >= 0) {
// flag h is set (Unused in v2.4.0)
$flags = $flags - 1;
$flaglist .= "h,";
}
        if (strlen($flaglist) > 0)
        {
                $flaglist = substr($flaglist,0,strlen($flaglist)-1);
        }
        return $flaglist;
};

function get_id3pos ($filename)
{
        // This function will return the position of the ID3v2 tag if found
        $fp = fopen($filename,"r");
        while(!feof($fp)){
                $char = fgetc($fp);
                if($char == "I") {
                        $char = fgetc($fp);
                        if ($char == "D") {
                                $char = fgetc($fp);
                                if ($char == "3") {
                                        $id3pos = ftell($fp);
                                }
                        }
                }
        }
        fclose($fp);
        if (!$id3pos) {
                return false;
        } else {
                return $id3pos;
        }
};

function goto_id3pos ($filename,$id3pos)
{
        // This function will open the file, go to the ID3v2 tag position and return the filepointer
        $fp = fopen($filename,"r");
        if (fseek($fp,$id3pos) != 0) {
                die ("Could not go to ID3 tag\n");
        }
        return $fp;
};

function get_id3_version ($fp)
{
        // This function gets the ID3v2 version from the file open at the filepointer and returns it
        $ver1 = hexdec(bin2hex(fgetc($fp)));
        $ver2 = hexdec(bin2hex(fgetc($fp)));
        $version = "ID3v2." . $ver1 . "." . $ver2;
        return $version;
};

function get_tagsize ($fp)
{
        // This function gets the tagsize converts it from a synchsafe int to a normal int and returns it
        for ($i = 0; $i < 4; $i++) {
                $tagsize .= fgetc($fp);
        }
        $tagsize = rem_synchsafe($tagsize);
        return $tagsize;
};

function extract_id3v2($filename)
{
        // Find the position of the ID3v2 tag

        if (!$id3pos = get_id3pos($filename)) {
                die("No ID3v2 tag found in $filename\n");
        };

        // go to id3v2 tag in file

        $fp = goto_id3pos($filename,$id3pos);

        // Get the version

        $id3ver = get_id3_version($fp);

        $id3flags = get_flags($fp);

        $tagsize = get_tagsize($fp);
        $tagsize_left = $tagsize;
        while ($tagsize_left > 1) {
                unset($frameID);
                unset($framesize);
                unset($frame);
                for ($i = 0; $i < 4; $i++) {
                        $frameID .= fgetc($fp);
                }
                for ($i = 0; $i < 4; $i++) {
                        $framesize .= fgetc($fp);
                }
                $framesize = rem_synchsafe($framesize);
                if ($framesize >= 1)
                {
                        $tagsize_left = $tagsize_left - ($framesize + 10);
                        $flag1 = get_flags($fp);
                        $flag2 = get_flags($fp);
                        $encoding = hexdec(bin2hex(fgetc($fp)));
                        if ($encoding <= 3) {
                                // This is the encoding bit
                                for ($i = 0; $i < ($framesize - 1); $i++) {
                                        $frame .= fgetc($fp);
                                }
                        } else {
                                // This was not an encoding bit, it is part of the frame content
                                $frame = $encoding;
                                for ($i = 0; $i < $framesize; $i++) {
                                        $frame .= fgetc($fp);
                                }
                        }
                }
                else
                {
                        $frameID = "Padding";
                        $tagsize_left = 0;
                }
                if ($frameID == "SYLT" OR $frameID == "USLT" OR $frameID == "USER" OR $frameID == "COMM")
                {
                        $frame = substr($frame,3,strlen($frame));
                }
                $framearray["$frameID"] = $frame;
        };
        fclose($fp);
        return $framearray;
}
?>

Related Code Examples

	PHP based HTML rabbing Tools Categories : PHP, HTML and PHP, Tag Extractors, Regexps, Beginner Guides
	MP3 Tag reader module. Categories : PHP, Tag Extractors
	Parse a HTML-document for a certain tag and display its content and attributes. Categories : HTML and PHP, PHP, Tag Extractors
	Parsing html tags with php. Get an array from this function Categories : PHP, HTML and PHP, Arrays, Tag Extractors
	Query2Report : Generating Html, Pdf and Csv Reports from SQL Query Categories : PHP, PHP, HTML, PDF, Excel
	time() function with microseconds Categories : Date Time, PHP
	My Box - PHP Class that calculates the volumetric weight of a package. Categories : PHP, Object Oriented, PHP Classes, Beginner Guides, Payment Gateways
	Database Connectivity with MS Access - The Easy way to work with PHP and MS Access Categories : PHP, ADO, MS Access, Databases
	credit card security code Categories : PHP, Credit Cards, PHP Classes, Credit Cards
	Inline Scope Control - The inline class provides methods for creating and destroying local variable scopes. Simply put, local scopes are spaces where some or all of the global variables are temporarily hidden. Categories : PHP, PHP Classes, Variables
	TableMaint: class to help in the updating of data stored in database tables Categories : PHP, PHP Classes, Databases
	Compare two texts and display a block of text with the differences between them. Categories : PHP, PHP Classes, Filesystem, Strings, Arrays
	hw_Changeobject -- changes object Categories : PHP, PHP Functions, Hyperwave
	Logs hits to any page which includes it. Automatically utilises page access information left behind by PHP/FI2.0. Categories : Databases, PHP, mSQL, Databases
	Linkers Class Categories : PHP Classes, PHP

User Comments

Anders Olsen wrote :538
If you run into trouble with PHP timeouts it is because of the loop that locates the ID3v2 tag position. As most ID3v2 tags are found in the beginning of files I have modified the code to skip that loop and just read the tag from the start. This means that files where the tag is not located in the beginning is not supported. The newest version of this code can be found at: http://www.elffan.com/id3v2