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ID3 函数

id3_get_frame_long_name — Get the long name of an ID3v2 frame
id3_get_frame_short_name — Get the short name of an ID3v2 frame
id3_get_genre_id — Get the id for a genre
id3_get_genre_list — Get all possible genre values
id3_get_genre_name — Get the name for a genre id
id3_get_tag — Get all information stored in an ID3 tag
id3_get_version — Get version of an ID3 tag
id3_remove_tag — Remove an existing ID3 tag
id3_set_tag — Update information stored in an ID3 tag

User Contributed Notes

jbwalker at telus dot net 15-Nov-2006 11:58


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.





<?php 


 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


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


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


        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");


?>





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





<?php


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;


}


?>

wmd at wazee dot org 11-Jul-2004 02:31


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 函数

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