Mp3Info

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

1. Usage
2. Performance
3. Console scanner
4. API
   • Audio information
   • Class methods
   • Settings
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. 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.

Settings

You can adjust some variables to reconfigure before instantiating of object:

• Mp3Info::$headerSeekLimit - count of bytes to search for the first mpeg header in audio. Default: 2048 (bytes).
• Mp3Info::$framesCountRead - count of mpeg frames to read before compute audio duration. Default: 2 (frames).

Technical information

Supporting features:

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

Used sources:

• mpeg header description
• id3v2 tag specifications. Concretely: id3v2.3.0, id3v2.2.0, id3v2.4.0
• Descripion of VBR header "Xing"
• Xing, Info and Lame tags specifications