README

The fastest PHP library to get mp3 tags&meta.

This class extracts information from mpeg/mp3 audio:

Audio information:
- Duration
- Bit Rate
- Sample Rate
- Channels mode
- Codec and Layer version
- Frames count
Audio image (cover)
Audio tags:

tag	id3v1	id3v2
song	song	TIT2
artist	artist	TPE1
album	album	TALB
year	year	TYER
comment	comment	COMM
track	track	TRCK
genre	genre	TCON

Content

Usage
Performance
Console scanner
API
- Audio information
- Class methods
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 davaxi\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. To access id3v2 tags use $tags2 property. Also, you can use combined list of tags $tags, where id3v2 and id3v1 tags united with id3v1 keys.

// simple id3v1 tags
echo 'Song '.$audio->tags1['song'].' from '.$audio->tags1['artist'].PHP_EOL;
// specific id3v2 tags
echo 'Song '.$audio->tags2['TIT2'].' from '.$audio->tags2['TPE1'].PHP_EOL;

// combined tags (simplies way to get as more information as possible)
echo 'Song '.$audio->tags['song'].' from '.$audio->tags['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)
`$isVbr`	Contains `true` if audio has variable bit rate	boolean
`$hasCover`	Contains `true` if audio has a bundled image	boolean
`$channel`	Channel mode	`'stereo'` or `'dual_mono'` or `'joint_stereo'` or `'mono'`
`$tags1`	Audio tags ver. 1 (aka id3v1).	["song" => "Song name", "year" => 2009]
`$tags2`	Audio tags ver. 2 (aka id3v2), only text ones.	["TIT2" => "Long song name", ...]
`$tags`	Combined audio tags (from id3v1 & id3v2). Keys as in tags1.	["song" => "Long song name", "year" => 2009, ...]
`$coverProperties`	Information about a bundled with audio image.	["mime_type" => "image/jpeg", "picture_type" => 1, ...]
`$_parsingTime`	Contains time spent to read&extract audio information in sec.msec

Class methods

$audio = new Mp3Info($filename, $parseTags = false) Creates new instance of object and initiate parsing. If you need to parse audio tags (id3v1 and id3v2), pass true as second argument is.
$audio->getCover() Returns raw content of bundled with audio image.
Mp3Info::isValidAudio($filename) Static method that checks if file $filename looks like a mp3-file. Returns true if file looks like a mp3, otherwise false.

Technical information

Supporting features:

id3v1
id3v2.3.0, id3v2.4.0
CBR, Variable Bit Rate (VBR)

Used sources:

davaxi / mp3info

Maintainers

Details