ID3 Functions

id3_get_frame_long_name — Obtiene el nombre completo de una trama ID3v2
id3_get_frame_short_name — Obtiene el nombre corto de una trama ID3v2
id3_get_genre_id — Obtiene el identificador de un género musical
id3_get_genre_list — Obtiene la lista de todos los géneros musicales definidos
id3_get_genre_name — Obtiene el nombre de un género musical a partir de su identificador
id3_get_tag — Obtiene toda la información contenida en la etiqueta ID3
id3_get_version — Obtiene la versión de la etiqueta ID3
id3_remove_tag — Borrar una etiqueta ID3
id3_set_tag — Modifica la información contenida en la etiqueta ID3

id3_get_frame_long_name

ID3

Last updated: Fri, 18 Jul 2008

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ID3 Functions

regindk at gmail dot com
29-Dec-2006 03:54


Using the ID3 extension you might be interested in some more functionality for working with MP3-files that is missing in the PHP C-modules.



Such as extracting for instance the first 10 seconds of a song, merging MP3 files, calculating the exact length of the MP3 file.



The following class in pure PHP is available for that:

http://www.sourcerally.net/Scripts/20-PHP-MP3-Class

jbwalker at telus dot net
19-Nov-2006 12:37


Oops! The code below was inelegant to begin with and stripped down further to limit space taken up here, contains one serious bug: the assumption that the input tag header (first 10 bytes) will do for output. This likely works fine if your own finely tuned tags take up less real estate than MS's bloated headers but not if you read mp3s from a product that sets a tag length less than the length of your own header! A simple fix for this is to insert the code:



      $tagLen = 1024; # or whatever you like >your actual

      $Header = substr($Header,0,6).setHexTagLen($tagLen);



after the line '$music = etc.



The setHexTagLen can be figured out from the calcDecTagLen but here's some sample code.

        

function setHexTagLen($int) {

    $n = pow(128,3);

    $intVar = $int;

    $m = "";

    for ($i=0;$i<4;$i++) {

        $m .= chr(floor($intVar/$n));

        $intVar = $intVar % $n;

        $n=$n/128;

        }

    return $m;

    }

jbwalker at telus dot net
15-Nov-2006 08:58


Windows XP users may be having trouble with routines provided here and may (as above) only have access to "read" classes. The following very simplified "write" can be used for replacing Windows Media Player file tags, and with care and adjustments, can be used more generally.



 

                 define(_Title,"TIT2");

                 define(_Artist,"TPE1");

                 define(_Group,"TPE2");

                 define(_Album,"TALB");

                 define(_Genre,"TCON");

                 define(_TrackNo,"TRCK");

                 define(_Year,"TYER");

$frames = array(_Album=>"The Ultimate Experience",

                _TrackNo=>"1",

                _Title=>"All along the watchtower",

                _Artist=>"Jimi Hendrix",

                _Group=>"",

                _Year=>"19xx",                     

                _Genre=>"Rock");

#..........................................

#       WRITE ID3 TAGS (Write MP3 [v1, v2] 

#..........................................

function writeTags($mp3) {

    $fl = file_get_contents($mp3);

    $Header = substr($fl,0,10);

    $tagLen = calcDecTagLen(substr($Header,6,4),$tagLen);

    $music = substr($fl,$tagLen+10,-128);

    # Can use input Header for output but you may 

    # wish to change the output filename for testing    

    file_put_contents($mp3,mkV2Tag($Header,$tagLen).$music.mkV1Tag());

    }

#   Create the V2 tag

function mkV2Tag($Hdr,$tagLen) {

    Global $frames;

    $null = chr(0);

    $nl3 = $null.$null.$null;            # 0 bytes for flags and encoding

    $out = "";

    foreach($frames as $ky=>$val) {

        $n=strlen($val)+1;

        $out.= $ky.mkFrmLen($n).$nl3.$val;

        }

    return $Hdr.str_pad($out,$tagLen,$null);

    }

#    Calculate Tag Length from bytes 6-10 of existing header

function calcDecTagLen($word) {

    $m = 1;

    $int = 0;

    for ($i=strlen($word)-1;$i>-1;$i--) {

        $int +=$m*ord($word[$i]);

        $m=$m*128;

        }

    return $int;

    }

#    Make the 4 byte frame length value for the V2tag

function mkFrmLen($int) {

    $hx = "";

    while ($int>0) {

        $n = $int % 256;

        $hx = chr($n).$hx;

        $int=floor($int/256);

        }

    return str_pad($hx,4,chr(0),STR_PAD_LEFT);

    }

#    Create the 128 byte V1 tag

function mkV1Tag() {

    Global $frames;

    $tagOut = "TAG".

        adj($frames[_Title]).

        adj($frames[_Artist]).

        adj($frames[_Album]).

        str_pad($frames[_Year],4).

        str_pad(" ",29," ").

        chr($frames[_TrackNo]).

        chr($n);

    return $tagOut;

    }

#    Pad the header to 30 characters

function adj($str) {

    return substr(str_pad($str,30,chr(0)),0,30);

    }

    

#     This is a simple example for an mp3 in current folder    

    writeTags("01-Cognac Blues.mp3");

wmd at wazee dot org
11-Jul-2004 11:31


There are several highly developed id3 reader classes written in php that include id3v2 support, and support for other file formats (not just mpeg & id3). I recommend http://getid3.sourceforge.net/ as well as the id3 reader class integrated in the Zina is not Andromeda project (http://pancake.org/zina.html)

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id3_get_frame_long_name

ID3

Last updated: Fri, 18 Jul 2008

ID3 Functions

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