PHP: ID3 Functions - Manual

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id3_get_frame_long_name ob_iconv_handler

Last updated: Fri, 26 Jan 2007

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# LXI. ID3 Functions

# Введение

These functions let you read and manipulate ID3 tags. ID3 tags are used in MP3 files to store title of the song, as well as information about the artist, album, genre, year and track number.

Since version 0.2 it is also possible to extract text frames from ID3 v2.2+ tags.

# Требования

Эти функции всегда доступны.

# Установка

id3 is part of PECL and can be installed using the PEAR installer. To compile PHP with id3 support, download the sourcecode, put it in php-src/ext/id3 and compile PHP using --enable-id3.

# Настройка во время выполнения

Данное расширение не определяет никакие директивы конфигурации в `php.ini`.

# Типы ресурсов

Данное расширение не определяет никакие типы ресурсов.

# Predefined Constants

Most of the id3 functions either let you specify or return a tag version. In order to specify the version please use on of these constants.

`ID3_V1_0` (integer)

  `ID3_V1_0` is used if you are working with ID3 V1.0 tags. These tags may contain the fields title, artist, album, genre, year and comment.

`ID3_V1_1` (integer)

  `ID3_V1_1` is used if you are working with ID3 V1.1 tags. These tags may all information contained in v1.0 tags plus the track number.

`ID3_V2_1` (integer)

  `ID3_V2_1` is used if you are working with ID3 V2.1 tags.

`ID3_V2_2` (integer)

  `ID3_V2_2` is used if you are working with ID3 V2.2 tags.

`ID3_V2_3` (integer)

  `ID3_V2_3` is used if you are working with ID3 V2.3 tags.

`ID3_V2_4` (integer)

  `ID3_V2_4` is used if you are working with ID3 V2.4 tags.

`ID3_BEST` (integer)

  `ID3_BEST` is used if would like to let the id3 functions determine which tag version should be used.

add a note User Contributed Notes
ID3 Functions
regindk at gmail dot com
29-Dec-2006 06:54
`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
18-Nov-2006 03:37
`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 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.
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 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)`
add a note
id3_get_frame_long_name ob_iconv_handler

Last updated: Fri, 26 Jan 2007
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