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mp3info.php
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<?php
namespace wapmorgan\Mp3Info;
use Exception;
use RuntimeException;
/**
* This class extracts information about an mpeg audio. (supported mpeg versions: MPEG-1, MPEG-2)
* (supported mpeg audio layers: 1, 2, 3).
*
* It extracts:
* * All tags stored in both at the beginning and at the end of file (id3v2 and id3v1). id3v2.4.0 and id3v2.2.0 are not supported, only the most popular id3v2.3.0 is supported.
* * Audio parameters:
* * * - Total duration (in seconds)
* * * - BitRate (in bps)
* * * - SampleRate (in Hz)
* * * - Number of channels (stereo or not)
* * * - ... and other information
*
* Used sources:
* * {@link http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm mpeg header description}
* * {@link http://id3.org/Developer%20Information id3v2 tag specifications}. Specially: {@link http://id3.org/id3v2.3.0 id3v2.3.0}, {@link http://id3.org/id3v2-00 id3v2.2.0}, {@link http://id3.org/id3v2.4.0-changes id3v2.4.0}
* * {@link https://multimedia.cx/mp3extensions.txt Descripion of VBR header "Xing"}
* * {@link http://gabriel.mp3-tech.org/mp3infotag.html Xing, Info and Lame tags specifications}
*/
class Mp3Info {
const TAG1_SYNC = 'TAG';
const TAG2_SYNC = 'ID3';
const VBR_SYNC = 'Xing';
const CBR_SYNC = 'Info';
/**
* Magic constants
*/
const FRAME_SYNC = 0xffe0;
const LAYER_1_FRAME_SIZE = 384;
const LAYERS_23_FRAME_SIZE = 1152;
const META = 1;
const TAGS = 2;
const MPEG_1 = 1;
const MPEG_2 = 2;
const MPEG_25 = 3;
const CODEC_UNDEFINED = 4;
const LAYER_1 = 1;
const LAYER_2 = 2;
const LAYER_3 = 3;
const STEREO = 'stereo';
const JOINT_STEREO = 'joint_stereo';
const DUAL_MONO = 'dual_mono';
const MONO = 'mono';
/**
* @var array
*/
static private $_bitRateTable;
/**
* @var array
*/
static private $_sampleRateTable;
/**
* @var array
*/
static private $_vbrOffsets = [
self::MPEG_1 => [21, 36],
self::MPEG_2 => [13, 21],
self::MPEG_25 => [13, 21],
];
/**
* @var int Limit in bytes for seeking a mpeg header in file
*/
public static $headerSeekLimit = 2048;
/**
* @var int MPEG codec version (1 or 2 or 2.5 or undefined)
*/
public $codecVersion;
/**
* @var int Audio layer version (1 or 2 or 3)
*/
public $layerVersion;
/**
* @var int Audio size in bytes. Note that this value is NOT equals file size.
*/
public $audioSize;
/**
* @var float Audio duration in seconds.microseconds (e.g. 3603.0171428571)
*/
public $duration;
/**
* @var int Audio bit rate in bps (e.g. 128000)
*/
public $bitRate;
/**
* @var int Audio sample rate in Hz (e.g. 44100)
*/
public $sampleRate;
/**
* @var boolean Contains true if audio has variable bit rate
*/
public $isVbr = false;
/**
* @var boolean Contains true if audio has cover
*/
public $hasCover = false;
/**
* @var array Contains VBR properties
*/
public $vbrProperties = [];
/**
* @var array Contains picture properties
*/
public $coverProperties = [];
/**
* Channel mode (stereo or dual_mono or joint_stereo or mono)
* @var string
*/
public $channel;
/**
* @var array Unified list of tags (id3v1 and id3v2 united)
*/
public $tags = [];
/**
* @var array Audio tags ver. 1 (aka id3v1)
*/
public $tags1 = [];
/**
* @var array Audio tags ver. 2 (aka id3v2)
*/
public $tags2 = [];
/**
* @var int Major version of id3v2 tag (if id3v2 present) (2 or 3 or 4)
*/
public $id3v2MajorVersion;
/**
* @var int Minor version of id3v2 tag (if id3v2 present)
*/
public $id3v2MinorVersion;
/**
* @var array List of id3v2 header flags (if id3v2 present)
*/
public $id3v2Flags = [];
/**
* @var array List of id3v2 tags flags (if id3v2 present)
*/
public $id3v2TagsFlags = [];
/**
* @var string Contains audio file name
*/
public $_fileName;
/**
* @var int Contains file size
*/
public $_fileSize;
/**
* @var int Number of audio frames in file
*/
public $_framesCount = 0;
/**
* @var float Contains time spent to read&extract audio information.
*/
public $_parsingTime;
/**
* @var int Calculated frame size for Constant Bit Rate
*/
private $_cbrFrameSize;
/**
* @var int|null Size of id3v2-data
*/
public $_id3Size;
/**
* $mode is self::META, self::TAGS or their combination.
*
* @param string $filename
* @param bool $parseTags
*
* @throws \Exception
*/
public function __construct($filename, $parseTags = false) {
if (self::$_bitRateTable === null)
self::$_bitRateTable = [
Mp3Info::MPEG_1 => [
1 => [null, 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000, false], // MPEG 1 layer 1
2 => [null, 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000, false], // MPEG 1 layer 2
3 => [null, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, false], // MPEG 1 layer 3
],
Mp3Info::MPEG_2 => [
1 => [null, 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000, false], // MPEG 2 layer 1
2 => [null, 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, false], // MPEG 2 layer 2
3 => [null, 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, false], // MPEG 2 layer 3
],
];
self::$_bitRateTable[Mp3Info::MPEG_25] = self::$_bitRateTable[Mp3Info::MPEG_2];
if (self::$_sampleRateTable === null)
self::$_sampleRateTable = [
Mp3Info::MPEG_1 => [44100, 48000, 32000, false], // MPEG 1
Mp3Info::MPEG_2 => [22050, 24000, 16000, false], // MPEG 2
Mp3Info::MPEG_25 => [11025, 12000, 8000, false], // MPEG 2
];
$this->_fileName = $filename;
$isLocal = (strpos($filename, '://') === false);
if (!$isLocal) {
$this->_fileSize = static::getUrlContentLength($filename);
} else {
if (!file_exists($filename)) {
throw new \Exception('File ' . $filename . ' is not present!');
}
$this->_fileSize = filesize($filename);
}
if ($isLocal and !static::isValidAudio($filename)) {
throw new \Exception('File ' . $filename . ' is not mpeg/audio!');
}
$mode = $parseTags ? self::META | self::TAGS : self::META;
$this->audioSize = $this->parseAudio($this->_fileName, $this->_fileSize, $mode);
}
/**
* @return bool|null
*/
public function getCover()
{
if (empty($this->coverProperties)) {
return null;
}
$fp = fopen($this->_fileName, 'rb');
fseek($fp, $this->coverProperties['offset']);
$data = fread($fp, $this->coverProperties['size']);
fclose($fp);
return $data;
}
/**
* Reads audio file in binary mode.
* mpeg audio file structure:
* ID3V2 TAG - provides a lot of meta data. [optional]
* MPEG AUDIO FRAMES - contains audio data. A frame consists of a frame header and a frame data. The first frame may contain extra information about mp3 (marked with "Xing" or "Info" string). Rest of frames can contain only audio data.
* ID3V1 TAG - provides a few of meta data. [optional]
* @param string $filename
* @param int $fileSize
* @param int $mode
* @return float|int
* @throws \Exception
*/
private function parseAudio($filename, $fileSize, $mode) {
$time = microtime(true);
// create temp storage for media
if (strpos($filename, '://') !== false) {
$fp = fopen('php://memory', 'rwb');
fwrite($fp, file_get_contents($filename));
rewind($fp);
} else {
$fp = fopen($filename, 'rb');
}
/** @var int Size of audio data (exclude tags size) */
$audioSize = $fileSize;
// parse tags
if (fread($fp, 3) == self::TAG2_SYNC) {
if ($mode & self::TAGS) $audioSize -= ($this->_id3Size = $this->readId3v2Body($fp));
else {
fseek($fp, 2, SEEK_CUR); // 2 bytes of tag version
fseek($fp, 1, SEEK_CUR); // 1 byte of tag flags
$sizeBytes = $this->readBytes($fp, 4);
array_walk($sizeBytes, function (&$value) {
$value = substr(str_pad(base_convert($value, 10, 2), 8, 0, STR_PAD_LEFT), 1);
});
$size = bindec(implode(null, $sizeBytes)) + 10;
$audioSize -= ($this->_id3Size = $size);
}
}
fseek($fp, $fileSize - 128);
if (fread($fp, 3) == self::TAG1_SYNC) {
if ($mode & self::TAGS) $audioSize -= $this->readId3v1Body($fp);
else $audioSize -= 128;
}
if ($mode & self::TAGS) {
$this->fillTags();
}
fseek($fp, 0);
// audio meta
if ($mode & self::META) {
if ($this->_id3Size !== null) fseek($fp, $this->_id3Size);
/**
* First frame can lie. Need to fix in the future.
* @link https://github.com/wapmorgan/Mp3Info/issues/13#issuecomment-447470813
*/
$framesCount = $this->readMpegFrame($fp);
$this->_framesCount = $framesCount !== null
? $framesCount
: ceil($audioSize / $this->_cbrFrameSize);
// recalculate average bit rate in vbr case
if ($this->isVbr && $framesCount !== null) {
$avgFrameSize = $audioSize / $framesCount;
$this->bitRate = $avgFrameSize * $this->sampleRate / (1000 * $this->layerVersion == self::LAYER_3 ? 12 : 144);
}
// The faster way to detect audio duration:
$samples_in_second = $this->layerVersion == 1 ? self::LAYER_1_FRAME_SIZE : self::LAYERS_23_FRAME_SIZE;
// for VBR: adjust samples in second according to VBR quality
// disabled for now
// if ($this->isVbr && isset($this->vbrProperties['quality'])) {
// $samples_in_second = floor($samples_in_second * $this->vbrProperties['quality'] / 100);
// }
// Calculate total number of audio samples (framesCount * sampleInFrameCount) / samplesInSecondCount
$this->duration = ($this->_framesCount - 1) * $samples_in_second / $this->sampleRate;
}
fclose($fp);
$this->_parsingTime = microtime(true) - $time;
return $audioSize;
}
/**
* Read first frame information.
* @param resource $fp
* @return int Number of frames (if present if first frame of VBR-file)
* @throws \Exception
*/
private function readMpegFrame($fp) {
$header_seek_pos = ftell($fp) + self::$headerSeekLimit;
do {
$pos = ftell($fp);
$first_header_byte = $this->readBytes($fp, 1);
if ($first_header_byte[0] === 0xFF) {
$second_header_byte = $this->readBytes($fp, 1);
if ((($second_header_byte[0] >> 5) & 0b111) == 0b111) {
fseek($fp, $pos);
$header_bytes = $this->readBytes($fp, 4);
break;
}
}
fseek($fp, 1, SEEK_CUR);
} while (ftell($fp) <= $header_seek_pos);
if (!isset($header_bytes) || $header_bytes[0] !== 0xFF || (($header_bytes[1] >> 5) & 0b111) != 0b111) {
throw new \Exception('At '.$pos
.'(0x'.dechex($pos).') should be a frame header!');
}
switch ($header_bytes[1] >> 3 & 0b11) {
case 0b00: $this->codecVersion = self::MPEG_25; break;
case 0b01: $this->codecVersion = self::CODEC_UNDEFINED; break;
case 0b10: $this->codecVersion = self::MPEG_2; break;
case 0b11: $this->codecVersion = self::MPEG_1; break;
}
switch ($header_bytes[1] >> 1 & 0b11) {
case 0b01: $this->layerVersion = self::LAYER_3; break;
case 0b10: $this->layerVersion = self::LAYER_2; break;
case 0b11: $this->layerVersion = self::LAYER_1; break;
}
$this->bitRate = self::$_bitRateTable[$this->codecVersion][$this->layerVersion][$header_bytes[2] >> 4];
$this->sampleRate = self::$_sampleRateTable[$this->codecVersion][($header_bytes[2] >> 2) & 0b11];
switch ($header_bytes[3] >> 6) {
case 0b00: $this->channel = self::STEREO; break;
case 0b01: $this->channel = self::JOINT_STEREO; break;
case 0b10: $this->channel = self::DUAL_MONO; break;
case 0b11: $this->channel = self::MONO; break;
}
$vbr_offset = self::$_vbrOffsets[$this->codecVersion][$this->channel == self::MONO ? 0 : 1];
// check for VBR
fseek($fp, $pos + $vbr_offset);
if (fread($fp, 4) == self::VBR_SYNC) {
$this->isVbr = true;
$flagsBytes = $this->readBytes($fp, 4);
// VBR frames count presence
if (($flagsBytes[3] & 2)) {
$this->vbrProperties['frames'] = implode(null, unpack('N', fread($fp, 4)));
}
// VBR stream size presence
if ($flagsBytes[3] & 4) {
$this->vbrProperties['bytes'] = implode(null, unpack('N', fread($fp, 4)));
}
// VBR TOC presence
if ($flagsBytes[3] & 1) {
fseek($fp, 100, SEEK_CUR);
}
// VBR quality
if ($flagsBytes[3] & 8) {
$this->vbrProperties['quality'] = implode(null, unpack('N', fread($fp, 4)));
}
}
// go to the end of frame
if ($this->layerVersion == self::LAYER_1) {
$this->_cbrFrameSize = floor((12 * $this->bitRate / $this->sampleRate + ($header_bytes[2] >> 1 & 0b1)) * 4);
} else {
$this->_cbrFrameSize = floor(144 * $this->bitRate / $this->sampleRate + ($header_bytes[2] >> 1 & 0b1));
}
fseek($fp, $pos + $this->_cbrFrameSize);
return isset($this->vbrProperties['frames']) ? $this->vbrProperties['frames'] : null;
}
/**
* @param $fp
* @param $n
*
* @return array
* @throws \Exception
*/
private function readBytes($fp, $n) {
$raw = fread($fp, $n);
if (strlen($raw) !== $n) throw new \Exception('Unexpected end of file!');
$bytes = array();
for($i = 0; $i < $n; $i++) $bytes[$i] = ord($raw[$i]);
return $bytes;
}
/**
* Reads id3v1 tag.
* @return int Returns length of id3v1 tag.
*/
private function readId3v1Body($fp) {
$this->tags1['song'] = trim(fread($fp, 30));
$this->tags1['artist'] = trim(fread($fp, 30));
$this->tags1['album'] = trim(fread($fp, 30));
$this->tags1['year'] = trim(fread($fp, 4));
$this->tags1['comment'] = trim(fread($fp, 28));
fseek($fp, 1, SEEK_CUR);
$this->tags1['track'] = ord(fread($fp, 1));
$this->tags1['genre'] = ord(fread($fp, 1));
return 128;
}
/**
* Reads id3v2 tag.
* -----------------------------------
* Overall tag header structure (10 bytes)
* ID3v2/file identifier "ID3" (3 bytes)
* ID3v2 version (2 bytes)
* ID3v2 flags (1 byte)
* ID3v2 size 4 * %0xxxxxxx (4 bytes)
* -----------------------------------
* id3v2.2.0 tag header (10 bytes)
* ID3/file identifier "ID3" (3 bytes)
* ID3 version $02 00 (2 bytes)
* ID3 flags %xx000000 (1 byte)
* ID3 size 4 * %0xxxxxxx (4 bytes)
* Flags:
* x (bit 7) - unsynchronisation
* x (bit 6) - compression
* -----------------------------------
* id3v2.3.0 tag header (10 bytes)
* ID3v2/file identifier "ID3" (3 bytes)
* ID3v2 version $03 00 (2 bytes)
* ID3v2 flags %abc00000 (1 byte)
* ID3v2 size 4 * %0xxxxxxx (4 bytes)
* Flags:
* a - Unsynchronisation
* b - Extended header
* c - Experimental indicator
* Extended header structure (10 bytes)
* Extended header size $xx xx xx xx
* Extended Flags $xx xx
* Size of padding $xx xx xx xx
* Extended flags:
* %x0000000 00000000
* x - CRC data present
* -----------------------------------
* id3v2.4.0 tag header (10 bytes)
* ID3v2/file identifier "ID3" (3 bytes)
* ID3v2 version $04 00 (2 bytes)
* ID3v2 flags %abcd0000 (1 byte)
* ID3v2 size 4 * %0xxxxxxx (4 bytes)
* Flags:
* a - Unsynchronisation
* b - Extended header
* c - Experimental indicator
* d - Footer present
* @param resource $fp
* @return int Returns length of id3v2 tag.
* @throws \Exception
*/
private function readId3v2Body($fp)
{
// read the rest of the id3v2 header
$raw = fread($fp, 7);
$data = unpack('cmajor_version/cminor_version/H*', $raw);
$this->id3v2MajorVersion = $data['major_version'];
$this->id3v2MinorVersion = $data['minor_version'];
$data = str_pad(base_convert($data[1], 16, 2), 40, 0, STR_PAD_LEFT);
$flags = substr($data, 0, 8);
if ($this->id3v2MajorVersion == 2) { // parse id3v2.2.0 header flags
$this->id3v2Flags = array(
'unsynchronisation' => (bool)substr($flags, 0, 1),
'compression' => (bool)substr($flags, 1, 1),
);
} else if ($this->id3v2MajorVersion == 3) { // parse id3v2.3.0 header flags
$this->id3v2Flags = array(
'unsynchronisation' => (bool)substr($flags, 0, 1),
'extended_header' => (bool)substr($flags, 1, 1),
'experimental_indicator' => (bool)substr($flags, 2, 1),
);
if ($this->id3v2Flags['extended_header'])
throw new \Exception('NEED TO PARSE EXTENDED HEADER!');
} else if ($this->id3v2MajorVersion == 4) { // parse id3v2.4.0 header flags
$this->id3v2Flags = array(
'unsynchronisation' => (bool)substr($flags, 0, 1),
'extended_header' => (bool)substr($flags, 1, 1),
'experimental_indicator' => (bool)substr($flags, 2, 1),
'footer_present' => (bool)substr($flags, 3, 1),
);
if ($this->id3v2Flags['extended_header'])
throw new \Exception('NEED TO PARSE EXTENDED HEADER!');
if ($this->id3v2Flags['footer_present'])
throw new \Exception('NEED TO PARSE id3v2.4 FOOTER!');
}
$size = substr($data, 8, 32);
// some fucking shit
// getting only 7 of 8 bits of size bytes
$sizes = str_split($size, 8);
array_walk($sizes, function (&$value) {
$value = substr($value, 1);
});
$size = implode("", $sizes);
$size = bindec($size);
if ($this->id3v2MajorVersion == 2) {
// parse id3v2.2.0 body
/*throw new \Exception('NEED TO PARSE id3v2.2.0 flags!');*/
} else if ($this->id3v2MajorVersion == 3) {
// parse id3v2.3.0 body
$this->parseId3v23Body($fp, 10 + $size);
} else if ($this->id3v2MajorVersion == 4) {
// parse id3v2.4.0 body
$this->parseId3v24Body($fp, 10 + $size);
}
return 10 + $size; // 10 bytes - header, rest - body
}
/**
* Parses id3v2.3.0 tag body.
* @todo Complete.
*/
protected function parseId3v23Body($fp, $lastByte) {
while (ftell($fp) < $lastByte) {
$raw = fread($fp, 10);
$frame_id = substr($raw, 0, 4);
if ($frame_id == str_repeat(chr(0), 4)) {
fseek($fp, $lastByte);
break;
}
$data = unpack('Nframe_size/H2flags', substr($raw, 4));
$frame_size = $data['frame_size'];
$flags = base_convert($data['flags'], 16, 2);
$this->id3v2TagsFlags[$frame_id] = array(
'flags' => array(
'tag_alter_preservation' => (bool)substr($flags, 0, 1),
'file_alter_preservation' => (bool)substr($flags, 1, 1),
'read_only' => (bool)substr($flags, 2, 1),
'compression' => (bool)substr($flags, 8, 1),
'encryption' => (bool)substr($flags, 9, 1),
'grouping_identity' => (bool)substr($flags, 10, 1),
),
);
switch ($frame_id) {
// case 'UFID': # Unique file identifier
// break;
################# Text information frames
case 'TALB': # Album/Movie/Show title
case 'TCON': # Content type
case 'TYER': # Year
case 'TXXX': # User defined text information frame
case 'TRCK': # Track number/Position in set
case 'TIT2': # Title/songname/content description
case 'TPE1': # Lead performer(s)/Soloist(s)
case 'TBPM': # BPM (beats per minute)
case 'TCOM': # Composer
case 'TCOP': # Copyright message
case 'TDAT': # Date
case 'TDLY': # Playlist delay
case 'TENC': # Encoded by
case 'TEXT': # Lyricist/Text writer
case 'TFLT': # File type
case 'TIME': # Time
case 'TIT1': # Content group description
case 'TIT3': # Subtitle/Description refinement
case 'TKEY': # Initial key
case 'TLAN': # Language(s)
case 'TLEN': # Length
case 'TMED': # Media type
case 'TOAL': # Original album/movie/show title
case 'TOFN': # Original filename
case 'TOLY': # Original lyricist(s)/text writer(s)
case 'TOPE': # Original artist(s)/performer(s)
case 'TORY': # Original release year
case 'TOWN': # File owner/licensee
case 'TPE2': # Band/orchestra/accompaniment
case 'TPE3': # Conductor/performer refinement
case 'TPE4': # Interpreted, remixed, or otherwise modified by
case 'TPOS': # Part of a set
case 'TPUB': # Publisher
case 'TRDA': # Recording dates
case 'TRSN': # Internet radio station name
case 'TRSO': # Internet radio station owner
case 'TSIZ': # Size
case 'TSRC': # ISRC (international standard recording code)
case 'TSSE': # Software/Hardware and settings used for encoding
$this->tags2[$frame_id] = $this->handleTextFrame($frame_size, fread($fp, $frame_size));
break;
################# Text information frames
################# URL link frames
// case 'WCOM': # Commercial information
// break;
// case 'WCOP': # Copyright/Legal information
// break;
// case 'WOAF': # Official audio file webpage
// break;
// case 'WOAR': # Official artist/performer webpage
// break;
// case 'WOAS': # Official audio source webpage
// break;
// case 'WORS': # Official internet radio station homepage
// break;
// case 'WPAY': # Payment
// break;
// case 'WPUB': # Publishers official webpage
// break;
// case 'WXXX': # User defined URL link frame
// break;
################# URL link frames
// case 'IPLS': # Involved people list
// break;
// case 'MCDI': # Music CD identifier
// break;
// case 'ETCO': # Event timing codes
// break;
// case 'MLLT': # MPEG location lookup table
// break;
// case 'SYTC': # Synchronized tempo codes
// break;
// case 'USLT': # Unsychronized lyric/text transcription
// break;
// case 'SYLT': # Synchronized lyric/text
// break;
case 'COMM': # Comments
$dataEnd = ftell($fp) + $frame_size;
$raw = fread($fp, 4);
$data = unpack('C1encoding/A3language', $raw);
// read until \null character
$short_description = null;
$last_null = false;
$actual_text = false;
while (ftell($fp) < $dataEnd) {
$char = fgetc($fp);
if ($char == "\00" && $actual_text === false) {
if ($data['encoding'] == 0x1) { # two null-bytes for utf-16
if ($last_null)
$actual_text = null;
else
$last_null = true;
} else # no condition for iso-8859-1
$actual_text = null;
}
else if ($actual_text !== false) $actual_text .= $char;
else $short_description .= $char;
}
if ($actual_text === false) $actual_text = $short_description;
// list($short_description, $actual_text) = sscanf("s".chr(0)."s", $data['texts']);
// list($short_description, $actual_text) = explode(chr(0), $data['texts']);
$this->tags2[$frame_id][$data['language']] = array(
'short' => (bool)($data['encoding'] == 0x00) ? mb_convert_encoding($short_description, 'utf-8', 'iso-8859-1') : mb_convert_encoding($short_description, 'utf-8', 'utf-16'),
'actual' => (bool)($data['encoding'] == 0x00) ? mb_convert_encoding($actual_text, 'utf-8', 'iso-8859-1') : mb_convert_encoding($actual_text, 'utf-8', 'utf-16'),
);
break;
// case 'RVAD': # Relative volume adjustment
// break;
// case 'EQUA': # Equalization
// break;
// case 'RVRB': # Reverb
// break;
case 'APIC': # Attached picture
$this->hasCover = true;
$last_byte = ftell($fp) + $frame_size;
$this->coverProperties = ['text_encoding' => ord(fread($fp, 1))];
// fseek($fp, $frame_size - 4, SEEK_CUR);
$this->coverProperties['mime_type'] = $this->readTextUntilNull($fp, $last_byte);
$this->coverProperties['picture_type'] = ord(fread($fp, 1));
$this->coverProperties['description'] = $this->readTextUntilNull($fp, $last_byte);
$this->coverProperties['offset'] = ftell($fp);
$this->coverProperties['size'] = $last_byte - ftell($fp);
fseek($fp, $last_byte);
break;
// case 'GEOB': # General encapsulated object
// break;
case 'PCNT': # Play counter
$data = unpack('L', fread($fp, $frame_size));
$this->tags2[$frame_id] = $data[1];
break;
// case 'POPM': # Popularimeter
// break;
// case 'RBUF': # Recommended buffer size
// break;
// case 'AENC': # Audio encryption
// break;
// case 'LINK': # Linked information
// break;
// case 'POSS': # Position synchronisation frame
// break;
// case 'USER': # Terms of use
// break;
// case 'OWNE': # Ownership frame
// break;
// case 'COMR': # Commercial frame
// break;
// case 'ENCR': # Encryption method registration
// break;
// case 'GRID': # Group identification registration
// break;
// case 'PRIV': # Private frame
// break;
default:
fseek($fp, $frame_size, SEEK_CUR);
break;
}
}
}
/**
* Parses id3v2.4.0 tag body.
* @param $fp
* @param $lastByte
*/
protected function parseId3v24Body($fp, $lastByte)
{
while (ftell($fp) < $lastByte) {
$raw = fread($fp, 10);
$frame_id = substr($raw, 0, 4);
if ($frame_id == str_repeat(chr(0), 4)) {
fseek($fp, $lastByte);
break;
}
$data = unpack('Nframe_size/H2flags', substr($raw, 4));
$frame_size = $data['frame_size'];
$flags = base_convert($data['flags'], 16, 2);
$this->id3v2TagsFlags[$frame_id] = array(
'flags' => array(
'tag_alter_preservation' => (bool)substr($flags, 1, 1),
'file_alter_preservation' => (bool)substr($flags, 2, 1),
'read_only' => (bool)substr($flags, 3, 1),
'grouping_identity' => (bool)substr($flags, 9, 1),
'compression' => (bool)substr($flags, 12, 1),
'encryption' => (bool)substr($flags, 13, 1),
'unsynchronisation' => (bool)substr($flags, 14, 1),
'data_length_indicator' => (bool)substr($flags, 15, 1),
),
);
switch ($frame_id) {
// case 'UFID': # Unique file identifier
// break;
################# Text information frames
case 'TALB': # Album/Movie/Show title
case 'TCON': # Content type
case 'TYER': # Year
case 'TXXX': # User defined text information frame
case 'TRCK': # Track number/Position in set
case 'TIT2': # Title/songname/content description
case 'TPE1': # Lead performer(s)/Soloist(s)
case 'TBPM': # BPM (beats per minute)
case 'TCOM': # Composer
case 'TCOP': # Copyright message
case 'TDAT': # Date
case 'TDLY': # Playlist delay
case 'TENC': # Encoded by
case 'TEXT': # Lyricist/Text writer
case 'TFLT': # File type
case 'TIME': # Time
case 'TIT1': # Content group description
case 'TIT3': # Subtitle/Description refinement
case 'TKEY': # Initial key
case 'TLAN': # Language(s)
case 'TLEN': # Length
case 'TMED': # Media type
case 'TOAL': # Original album/movie/show title
case 'TOFN': # Original filename
case 'TOLY': # Original lyricist(s)/text writer(s)
case 'TOPE': # Original artist(s)/performer(s)
case 'TORY': # Original release year
case 'TOWN': # File owner/licensee
case 'TPE2': # Band/orchestra/accompaniment
case 'TPE3': # Conductor/performer refinement
case 'TPE4': # Interpreted, remixed, or otherwise modified by
case 'TPOS': # Part of a set
case 'TPUB': # Publisher
case 'TRDA': # Recording dates
case 'TRSN': # Internet radio station name
case 'TRSO': # Internet radio station owner
case 'TSIZ': # Size
case 'TSRC': # ISRC (international standard recording code)
case 'TSSE': # Software/Hardware and settings used for encoding
$this->tags2[$frame_id] = $this->handleTextFrame($frame_size, fread($fp, $frame_size));
break;
################# Text information frames
################# URL link frames
// case 'WCOM': # Commercial information
// break;
// case 'WCOP': # Copyright/Legal information
// break;
// case 'WOAF': # Official audio file webpage
// break;
// case 'WOAR': # Official artist/performer webpage
// break;
// case 'WOAS': # Official audio source webpage
// break;
// case 'WORS': # Official internet radio station homepage
// break;
// case 'WPAY': # Payment
// break;
// case 'WPUB': # Publishers official webpage
// break;
// case 'WXXX': # User defined URL link frame
// break;
################# URL link frames
// case 'IPLS': # Involved people list
// break;
// case 'MCDI': # Music CD identifier
// break;
// case 'ETCO': # Event timing codes
// break;
// case 'MLLT': # MPEG location lookup table
// break;
// case 'SYTC': # Synchronized tempo codes
// break;
// case 'USLT': # Unsychronized lyric/text transcription
// break;
// case 'SYLT': # Synchronized lyric/text
// break;
case 'COMM': # Comments
$dataEnd = ftell($fp) + $frame_size;
$raw = fread($fp, 4);
$data = unpack('C1encoding/A3language', $raw);
// read until \null character
$short_description = null;
$last_null = false;
$actual_text = false;
while (ftell($fp) < $dataEnd) {
$char = fgetc($fp);
if ($char == "\00" && $actual_text === false) {
if ($data['encoding'] == 0x1) { # two null-bytes for utf-16
if ($last_null)
$actual_text = null;
else
$last_null = true;
} else # no condition for iso-8859-1
$actual_text = null;
}
else if ($actual_text !== false) $actual_text .= $char;
else $short_description .= $char;
}
if ($actual_text === false) $actual_text = $short_description;
// list($short_description, $actual_text) = sscanf("s".chr(0)."s", $data['texts']);
// list($short_description, $actual_text) = explode(chr(0), $data['texts']);
$this->tags2[$frame_id][$data['language']] = array(
'short' => (bool)($data['encoding'] == 0x00) ? mb_convert_encoding($short_description, 'utf-8', 'iso-8859-1') : mb_convert_encoding($short_description, 'utf-8', 'utf-16'),
'actual' => (bool)($data['encoding'] == 0x00) ? mb_convert_encoding($actual_text, 'utf-8', 'iso-8859-1') : mb_convert_encoding($actual_text, 'utf-8', 'utf-16'),
);
break;
// case 'RVAD': # Relative volume adjustment
// break;
// case 'EQUA': # Equalization
// break;
// case 'RVRB': # Reverb
// break;
case 'APIC': # Attached picture
$this->hasCover = true;
$last_byte = ftell($fp) + $frame_size;
$this->coverProperties = ['text_encoding' => ord(fread($fp, 1))];
// fseek($fp, $frame_size - 4, SEEK_CUR);
$this->coverProperties['mime_type'] = $this->readTextUntilNull($fp, $last_byte);
$this->coverProperties['picture_type'] = ord(fread($fp, 1));
$this->coverProperties['description'] = $this->readTextUntilNull($fp, $last_byte);
$this->coverProperties['offset'] = ftell($fp);
$this->coverProperties['size'] = $last_byte - ftell($fp);
fseek($fp, $last_byte);
break;
// case 'GEOB': # General encapsulated object
// break;
case 'PCNT': # Play counter
$data = unpack('L', fread($fp, $frame_size));
$this->tags2[$frame_id] = $data[1];
break;
// case 'POPM': # Popularimeter
// break;
// case 'RBUF': # Recommended buffer size
// break;
// case 'AENC': # Audio encryption
// break;
// case 'LINK': # Linked information
// break;
// case 'POSS': # Position synchronisation frame
// break;
// case 'USER': # Terms of use
// break;
// case 'OWNE': # Ownership frame
// break;
// case 'COMR': # Commercial frame
// break;
// case 'ENCR': # Encryption method registration
// break;
// case 'GRID': # Group identification registration
// break;
// case 'PRIV': # Private frame
// break;
default:
fseek($fp, $frame_size, SEEK_CUR);
break;
}
}
}
/**
* @param $frameSize
* @param $raw
*
* @return string
*/
private function handleTextFrame($frameSize, $raw)
{
$data = unpack('C1encoding/A' . ($frameSize - 1) . 'information', $raw);
switch($data['encoding']) {
case 0x00: # ISO-8859-1
return mb_convert_encoding($data['information'], 'utf-8', 'iso-8859-1');
case 0x01: # utf-16 with BOM
return mb_convert_encoding($data['information'] . "\00", 'utf-8', 'utf-16');
# Following is for id3v2.4.x only
case 0x02: # utf-16 without BOM
return mb_convert_encoding($data['information'] . "\00", 'utf-8', 'utf-16');
case 0x03: # utf-8
return $data['information'];