Mp3Info

The fastest PHP library to get mp3 tags&meta.

This class extracts information from mpeg/mp3 audio:

Audio	id3v1 & id3v2 Tags
duration	song (TIT2)
bitRate	artist (TPE1)
sampleRate	album (TALB)
channel	year (TYER)
framesCount	comment (COMM)
codecVersion	track (TRCK)
layerVersion	genre (TCON)

1. Usage
2. Performance
3. Console scanner
4. API
   • Audio information
   • Object members
   • Static methods
5. Technical information

Usage

After creating an instance of Mp3Info with passing filename as the first argument to the constructor, you can retrieve data from object properties (listed below).

use wapmorgan\Mp3Info\Mp3Info;
// To get basic audio information
$audio = new Mp3Info('./audio.mp3');

// If you need parse tags, you should set 2nd argument this way:
$audio = new Mp3Info('./audio.mp3', true);

And after that access object properties to get audio information:

echo 'Audio duration: '.floor($audio->duration / 60).' min '.floor($audio->duration % 60).' sec'.PHP_EOL;
echo 'Audio bitrate: '.($audio->bitRate / 1000).' kb/s'.PHP_EOL;
// and so on ...

To access id3v1 tags use $tags1 property:

echo 'Song '.$audio->tags1['song'].' from '.$audio->tags1['artist'].PHP_EOL;

Performance

• Typically it parses one mp3-file with size around 6-7 mb in less than 0.001 sec.
• List of 112 files with constant & variable bitRate with total duration 5:22:28 are parsed in 1.76 sec. getId3 library against exactly the same mp3 list works for 8x-10x slower - 9.9 sec.
• If you want, there's a very easy way to compare. Just install nass600/get-id3 package and run console scanner against any folder with audios. It will print time that Mp3Info spent and that getId3.

Console scanner

To test Mp3Info you can use built-in script that scans dirs and analyzes all mp3-files inside them. To launch script against current folder:

php bin/scan ./

API

Audio information

Property	Description	Values
$codecVersion	MPEG codec version	1 or 2
$layerVersion	Audio layer version	1 or 2 or 3
$audioSize	Audio size in bytes. Note that this value is NOT equals file size.	int
$duration	Audio duration in seconds.microseconds	like 3603.0171428571 (means 1 hour and 3 sec)
$bitRate	Audio bit rate in bps	like 128000 (means 128kb/s)
$sampleRate	Audio sample rate in Hz	like 44100 (means 44.1KHz)
$isVbr	Contains true if audio has variable bit rate	boolean
$channel	Channel mode	'stereo' or 'dual_mono' or 'joint_stereo' or 'mono'

Object members

• float $_parsingTime

  Contains time spent to read&extract audio information in sec.msec.

• array $tags1

  Audio tags ver. 1 (aka id3v1).

• array $tags2

  Audio tags ver. 2 (aka id3v2).

• public function __construct($filename, $parseTags = false)

  Creates new instance of object and initiate parsing. If second argument is true, audio tags will be parsed.

Static methods

• static public function isValidAudio($filename)

  Checks if file $filename looks like an mp3-file. Returns true if file similar to mp3, otherwise false.

Technical information

Supporting features:

• id3v1
• id3v2.3.0
• Variable Bit Rate (VBR)

Used sources:

• mpeg header description
• id3v2 tag specifications. Сoncretely: id3v2.3.0, id3v2.2.0, id3v2.4.0
• Xing, Info and Lame tags specifications