function getID3v2Filepointer(&$fd, &$ThisFileInfo)
{
// Overall tag structure:
// +-----------------------------+
// | Header (10 bytes) |
// +-----------------------------+
// | Extended Header |
// | (variable length, OPTIONAL) |
// +-----------------------------+
// | Frames (variable length) |
// +-----------------------------+
// | Padding |
// | (variable length, OPTIONAL) |
// +-----------------------------+
// | Footer (10 bytes, OPTIONAL) |
// +-----------------------------+
// Header
// ID3v2/file identifier "ID3"
// ID3v2 version $04 00
// ID3v2 flags (%ab000000 in v2.2, %abc00000 in v2.3, %abcd0000 in v2.4.x)
// ID3v2 size 4 * %0xxxxxxx
rewind($fd);
$header = fread($fd, 10);
if (substr($header, 0, 3) == 'ID3') {
$ThisFileInfo['id3v2']['header'] = true;
$ThisFileInfo['id3v2']['majorversion'] = ord($header[3]);
$ThisFileInfo['id3v2']['minorversion'] = ord($header[4]);
} else {
return false;
}
if ($ThisFileInfo['id3v2']['majorversion'] > 4) {
// this script probably won't correctly parse ID3v2.5.x and above.
$ThisFileInfo['error'] .= "\n" . 'this script only parses up to ID3v2.4.x - this tag is ID3v2.' . $ThisFileInfo['id3v2']['majorversion'] . '.' . $ThisFileInfo['id3v2']['minorversion'];
return false;
}
$id3_flags = BigEndian2Bin($header[5]);
switch ($ThisFileInfo['id3v2']['majorversion']) {
case 2:
// %ab000000 in v2.2
$ThisFileInfo['id3v2']['flags']['unsynch'] = $id3_flags[0];
// a - Unsynchronisation
$ThisFileInfo['id3v2']['flags']['compression'] = $id3_flags[1];
// b - Compression
break;
case 3:
// %abc00000 in v2.3
$ThisFileInfo['id3v2']['flags']['unsynch'] = $id3_flags[0];
// a - Unsynchronisation
$ThisFileInfo['id3v2']['flags']['exthead'] = $id3_flags[1];
// b - Extended header
$ThisFileInfo['id3v2']['flags']['experim'] = $id3_flags[2];
// c - Experimental indicator
break;
case 4:
// %abcd0000 in v2.4
$ThisFileInfo['id3v2']['flags']['unsynch'] = $id3_flags[0];
// a - Unsynchronisation
$ThisFileInfo['id3v2']['flags']['exthead'] = $id3_flags[1];
// b - Extended header
$ThisFileInfo['id3v2']['flags']['experim'] = $id3_flags[2];
// c - Experimental indicator
$ThisFileInfo['id3v2']['flags']['isfooter'] = $id3_flags[3];
// d - Footer present
break;
}
$ThisFileInfo['id3v2']['headerlength'] = BigEndian2Int(substr($header, 6, 4), 1) + ID3v2HeaderLength($ThisFileInfo['id3v2']['majorversion']);
// Extended Header
if (isset($ThisFileInfo['id3v2']['flags']['exthead']) && $ThisFileInfo['id3v2']['flags']['exthead']) {
// Extended header size 4 * %0xxxxxxx
// Number of flag bytes $01
// Extended Flags $xx
// Where the 'Extended header size' is the size of the whole extended header, stored as a 32 bit synchsafe integer.
$extheader = fread($fd, 4);
$ThisFileInfo['id3v2']['extheaderlength'] = BigEndian2Int($extheader, 1);
// The extended flags field, with its size described by 'number of flag bytes', is defined as:
// %0bcd0000
// b - Tag is an update
// Flag data length $00
// c - CRC data present
// Flag data length $05
// Total frame CRC 5 * %0xxxxxxx
// d - Tag restrictions
// Flag data length $01
$extheaderflagbytes = fread($fd, 1);
$extheaderflags = fread($fd, $extheaderflagbytes);
$id3_exthead_flags = BigEndian2Bin(substr($header, 5, 1));
$ThisFileInfo['id3v2']['exthead_flags']['update'] = substr($id3_exthead_flags, 1, 1);
$ThisFileInfo['id3v2']['exthead_flags']['CRC'] = substr($id3_exthead_flags, 2, 1);
if ($ThisFileInfo['id3v2']['exthead_flags']['CRC']) {
$extheaderrawCRC = fread($fd, 5);
$ThisFileInfo['id3v2']['exthead_flags']['CRC'] = BigEndian2Int($extheaderrawCRC, 1);
}
$ThisFileInfo['id3v2']['exthead_flags']['restrictions'] = substr($id3_exthead_flags, 3, 1);
if ($ThisFileInfo['id3v2']['exthead_flags']['restrictions']) {
// Restrictions %ppqrrstt
$extheaderrawrestrictions = fread($fd, 1);
$ThisFileInfo['id3v2']['exthead_flags']['restrictions_tagsize'] = (bindec('11000000') & ord($extheaderrawrestrictions)) >> 6;
// p - Tag size restrictions
$ThisFileInfo['id3v2']['exthead_flags']['restrictions_textenc'] = (bindec('00100000') & ord($extheaderrawrestrictions)) >> 5;
// q - Text encoding restrictions
$ThisFileInfo['id3v2']['exthead_flags']['restrictions_textsize'] = (bindec('00011000') & ord($extheaderrawrestrictions)) >> 3;
// r - Text fields size restrictions
$ThisFileInfo['id3v2']['exthead_flags']['restrictions_imgenc'] = (bindec('00000100') & ord($extheaderrawrestrictions)) >> 2;
// s - Image encoding restrictions
$ThisFileInfo['id3v2']['exthead_flags']['restrictions_imgsize'] = (bindec('00000011') & ord($extheaderrawrestrictions)) >> 0;
// t - Image size restrictions
}
}
// end extended header
// Frames
// All ID3v2 frames consists of one frame header followed by one or more
// fields containing the actual information. The header is always 10
// bytes and laid out as follows:
//
// Frame ID $xx xx xx xx (four characters)
// Size 4 * %0xxxxxxx
// Flags $xx xx
$sizeofframes = $ThisFileInfo['id3v2']['headerlength'] - ID3v2HeaderLength($ThisFileInfo['id3v2']['majorversion']);
if (isset($ThisFileInfo['id3v2']['extheaderlength'])) {
$sizeofframes -= $ThisFileInfo['id3v2']['extheaderlength'];
}
if (isset($ThisFileInfo['id3v2']['flags']['isfooter']) && $ThisFileInfo['id3v2']['flags']['isfooter']) {
$sizeofframes -= 10;
// footer takes last 10 bytes of ID3v2 header, after frame data, before audio
}
if ($sizeofframes > 0) {
$framedata = fread($fd, $sizeofframes);
// read all frames from file into $framedata variable
// if entire frame data is unsynched, de-unsynch it now (ID3v2.3.x)
if (isset($ThisFileInfo['id3v2']['flags']['unsynch']) && $ThisFileInfo['id3v2']['flags']['unsynch'] && $ThisFileInfo['id3v2']['majorversion'] <= 3) {
$framedata = DeUnSynchronise($framedata);
}
// [in ID3v2.4.0] Unsynchronisation [S:6.1] is done on frame level, instead
// of on tag level, making it easier to skip frames, increasing the streamability
// of the tag. The unsynchronisation flag in the header [S:3.1] indicates that
// there exists an unsynchronised frame, while the new unsynchronisation flag in
// the frame header [S:4.1.2] indicates unsynchronisation.
$framedataoffset = 10;
// how many bytes into the stream - start from after the 10-byte header
while (isset($framedata) && strlen($framedata) > 0) {
// cycle through until no more frame data is left to parse
if (strlen($framedata) < ID3v2HeaderLength($ThisFileInfo['id3v2']['majorversion'])) {
// insufficient room left in ID3v2 header for actual data - must be padding
$ThisFileInfo['id3v2']['padding']['start'] = $framedataoffset;
$ThisFileInfo['id3v2']['padding']['length'] = strlen($framedata);
$ThisFileInfo['id3v2']['padding']['valid'] = true;
for ($i = 0; $i < $ThisFileInfo['id3v2']['padding']['length']; $i++) {
if (substr($framedata, $i, 1) != chr(0)) {
$ThisFileInfo['id3v2']['padding']['valid'] = false;
$ThisFileInfo['id3v2']['padding']['errorpos'] = $ThisFileInfo['id3v2']['padding']['start'] + $i;
$ThisFileInfo['warning'] .= "\n" . 'Invalid ID3v2 padding found at offset ' . $ThisFileInfo['id3v2']['padding']['errorpos'];
break;
}
}
break;
// skip rest of ID3v2 header
}
if ($ThisFileInfo['id3v2']['majorversion'] == 2) {
// Frame ID $xx xx xx (three characters)
// Size $xx xx xx (24-bit integer)
// Flags $xx xx
$frame_header = substr($framedata, 0, 6);
// take next 6 bytes for header
$framedata = substr($framedata, 6);
// and leave the rest in $framedata
$frame_name = substr($frame_header, 0, 3);
$frame_size = BigEndian2Int(substr($frame_header, 3, 3), 0);
$frame_flags = '';
// not used for anything, just to avoid E_NOTICEs
} elseif ($ThisFileInfo['id3v2']['majorversion'] > 2) {
// Frame ID $xx xx xx xx (four characters)
// Size $xx xx xx xx (32-bit integer in v2.3, 28-bit synchsafe in v2.4+)
// Flags $xx xx
$frame_header = substr($framedata, 0, 10);
// take next 10 bytes for header
$framedata = substr($framedata, 10);
// and leave the rest in $framedata
$frame_name = substr($frame_header, 0, 4);
if ($ThisFileInfo['id3v2']['majorversion'] == 3) {
$frame_size = BigEndian2Int(substr($frame_header, 4, 4), 0);
// 32-bit integer
} else {
// ID3v2.4+
$frame_size = BigEndian2Int(substr($frame_header, 4, 4), 1);
// 32-bit synchsafe integer (28-bit value)
}
if ($frame_size < strlen($framedata) + 4) {
$nextFrameID = substr($framedata, $frame_size, 4);
if (IsValidID3v2FrameName($nextFrameID, $ThisFileInfo['id3v2']['majorversion'])) {
// next frame is OK
} elseif ($frame_name == chr(0) . 'MP3' || $frame_name == chr(0) . chr(0) . 'MP' || $frame_name == ' MP3' || $frame_name == 'MP3e') {
// MP3ext known broken frames - "ok" for the purposes of this test
} elseif ($ThisFileInfo['id3v2']['majorversion'] == 4 && IsValidID3v2FrameName(substr($framedata, BigEndian2Int(substr($frame_header, 4, 4), 0), 4), 3)) {
$ThisFileInfo['warning'] .= "\n" . 'ID3v2 tag written as ID3v2.4, but with non-synchsafe integers (ID3v2.3 style). Older versions of Helium2 (www.helium2.com) is a known culprit of this. Tag has been parsed as ID3v2.3';
$ThisFileInfo['id3v2']['majorversion'] = 3;
$frame_size = BigEndian2Int(substr($frame_header, 4, 4), 0);
// 32-bit integer
}
}
$frame_flags = BigEndian2Bin(substr($frame_header, 8, 2));
}
if ($ThisFileInfo['id3v2']['majorversion'] == 2 && $frame_name == chr(0) . chr(0) . chr(0) || $frame_name == chr(0) . chr(0) . chr(0) . chr(0)) {
// padding encountered
$ThisFileInfo['id3v2']['padding']['start'] = $framedataoffset;
$ThisFileInfo['id3v2']['padding']['length'] = strlen($framedata);
$ThisFileInfo['id3v2']['padding']['valid'] = true;
for ($i = 0; $i < $ThisFileInfo['id3v2']['padding']['length']; $i++) {
if (substr($framedata, $i, 1) != chr(0)) {
$ThisFileInfo['id3v2']['padding']['valid'] = false;
$ThisFileInfo['id3v2']['padding']['errorpos'] = $ThisFileInfo['id3v2']['padding']['start'] + $i;
$ThisFileInfo['warning'] .= "\n" . 'Invalid ID3v2 padding found at offset ' . $ThisFileInfo['id3v2']['padding']['errorpos'];
break;
}
}
break;
// skip rest of ID3v2 header
}
if ($frame_name == 'COM ') {
$ThisFileInfo['warning'] .= "\n" . 'error parsing "' . $frame_name . '" (' . $framedataoffset . ' bytes into the ID3v2.' . $ThisFileInfo['id3v2']['majorversion'] . ' tag). (ERROR: !IsValidID3v2FrameName("' . str_replace(chr(0), ' ', $frame_name) . '", ' . $ThisFileInfo['id3v2']['majorversion'] . '))). [Note: this particular error has been known to happen with tags edited by iTunes (versions "X v2.0.3", "v3.0.1" are known-guilty, probably others too)]';
$frame_name = 'COMM';
}
if ($frame_size <= strlen($framedata) && IsValidID3v2FrameName($frame_name, $ThisFileInfo['id3v2']['majorversion'])) {
$ThisFileInfo['id3v2']["{$frame_name}"]['data'] = substr($framedata, 0, $frame_size);
$ThisFileInfo['id3v2']["{$frame_name}"]['datalength'] = CastAsInt($frame_size);
$ThisFileInfo['id3v2']["{$frame_name}"]['dataoffset'] = $framedataoffset;
$framedata = substr($framedata, $frame_size);
// in getid3.frames.php - this function does all the FrameID-level parsing
ID3v2FrameProcessing($frame_name, $frame_flags, $ThisFileInfo);
} else {
// invalid frame length or FrameID
if ($frame_size <= strlen($framedata)) {
if (IsValidID3v2FrameName(substr($framedata, $frame_size, 4), $ThisFileInfo['id3v2']['majorversion'])) {
// next frame is valid, just skip the current frame
$framedata = substr($framedata, $frame_size);
$InvalidFrameMessageType = 'warning';
$InvalidFrameMessageText = ' Next frame is valid, skipping current frame.';
} else {
// next frame is invalid too, abort processing
unset($framedata);
$InvalidFrameMessageType = 'error';
$InvalidFrameMessageText = ' Next frame is also invalid, aborting processing.';
}
} elseif ($frame_size == strlen($framedata)) {
// this is the last frame, just skip
$InvalidFrameMessageType = 'warning';
$InvalidFrameMessageText = ' This was the last frame.';
} else {
// next frame is invalid too, abort processing
unset($framedata);
$InvalidFrameMessageType = 'error';
$InvalidFrameMessageText = ' Invalid frame size, aborting.';
}
if (!IsValidID3v2FrameName($frame_name, $ThisFileInfo['id3v2']['majorversion'])) {
switch ($frame_name) {
case chr(0) . chr(0) . 'MP':
case chr(0) . 'MP3':
case ' MP3':
case 'MP3e':
case chr(0) . 'MP':
case ' MP':
case 'MP3':
$InvalidFrameMessageType = 'warning';
$ThisFileInfo["{$InvalidFrameMessageType}"] .= "\n" . 'error parsing "' . $frame_name . '" (' . $framedataoffset . ' bytes into the ID3v2.' . $ThisFileInfo['id3v2']['majorversion'] . ' tag). (ERROR: !IsValidID3v2FrameName("' . str_replace(chr(0), ' ', $frame_name) . '", ' . $ThisFileInfo['id3v2']['majorversion'] . '))). [Note: this particular error has been known to happen with tags edited by "MP3ext (www.mutschler.de/mp3ext/)"]';
break;
default:
$ThisFileInfo["{$InvalidFrameMessageType}"] .= "\n" . 'error parsing "' . $frame_name . '" (' . $framedataoffset . ' bytes into the ID3v2.' . $ThisFileInfo['id3v2']['majorversion'] . ' tag). (ERROR: !IsValidID3v2FrameName("' . str_replace(chr(0), ' ', $frame_name) . '", ' . $ThisFileInfo['id3v2']['majorversion'] . '))).';
break;
}
} elseif ($frame_size > strlen($framedata)) {
$ThisFileInfo["{$InvalidFrameMessageType}"] .= "\n" . 'error parsing "' . $frame_name . '" (' . $framedataoffset . ' bytes into the ID3v2.' . $ThisFileInfo['id3v2']['majorversion'] . ' tag). (ERROR: $frame_size (' . $frame_size . ') > strlen($framedata) (' . strlen($framedata) . ')).';
} else {
$ThisFileInfo["{$InvalidFrameMessageType}"] .= "\n" . 'error parsing "' . $frame_name . '" (' . $framedataoffset . ' bytes into the ID3v2.' . $ThisFileInfo['id3v2']['majorversion'] . ' tag).';
}
$ThisFileInfo["{$InvalidFrameMessageType}"] .= $InvalidFrameMessageText;
}
$framedataoffset += $frame_size + ID3v2HeaderLength($ThisFileInfo['id3v2']['majorversion']);
}
}
// Footer
// The footer is a copy of the header, but with a different identifier.
// ID3v2 identifier "3DI"
// ID3v2 version $04 00
// ID3v2 flags %abcd0000
// ID3v2 size 4 * %0xxxxxxx
if (isset($ThisFileInfo['id3v2']['flags']['isfooter']) && $ThisFileInfo['id3v2']['flags']['isfooter']) {
$footer = fread($fd, 10);
if (substr($footer, 0, 3) == '3DI') {
$ThisFileInfo['id3v2']['footer'] = true;
$ThisFileInfo['id3v2']['majorversion_footer'] = ord(substr($footer, 3, 1));
$ThisFileInfo['id3v2']['minorversion_footer'] = ord(substr($footer, 4, 1));
}
if ($ThisFileInfo['id3v2']['majorversion_footer'] <= 4) {
$id3_flags = BigEndian2Bin(substr($footer, 5, 1));
$ThisFileInfo['id3v2']['flags']['unsynch_footer'] = substr($id3_flags, 0, 1);
$ThisFileInfo['id3v2']['flags']['extfoot_footer'] = substr($id3_flags, 1, 1);
$ThisFileInfo['id3v2']['flags']['experim_footer'] = substr($id3_flags, 2, 1);
$ThisFileInfo['id3v2']['flags']['isfooter_footer'] = substr($id3_flags, 3, 1);
$ThisFileInfo['id3v2']['footerlength'] = BigEndian2Int(substr($footer, 6, 4), 1);
}
}
// end footer
if (isset($ThisFileInfo['id3v2']['comments']['genre'])) {
foreach ($ThisFileInfo['id3v2']['comments']['genre'] as $key => $value) {
unset($ThisFileInfo['id3v2']['comments']['genre'][$key]);
$ThisFileInfo['id3v2']['comments'] = array_merge_noclobber($ThisFileInfo['id3v2']['comments'], ParseID3v2GenreString($value));
}
}
if (isset($ThisFileInfo['id3v2']['comments']['track'])) {
foreach ($ThisFileInfo['id3v2']['comments']['track'] as $key => $value) {
if (strstr($value, '/')) {
list($ThisFileInfo['id3v2']['comments']['track'][$key], $ThisFileInfo['id3v2']['comments']['totaltracks'][$key]) = explode('/', $ThisFileInfo['id3v2']['comments']['track'][$key]);
}
// Convert track number to integer (ID3v2 track numbers could be returned as a
// string ('03' for example) - this will ensure all track numbers are integers
$ThisFileInfo['id3v2']['comments']['track'][$key] = intval($ThisFileInfo['id3v2']['comments']['track'][$key]);
}
}
return true;
}
function getID3v2Filepointer($fd, &$MP3fileInfo)
{
// Overall tag structure:
// +-----------------------------+
// | Header (10 bytes) |
// +-----------------------------+
// | Extended Header |
// | (variable length, OPTIONAL) |
// +-----------------------------+
// | Frames (variable length) |
// +-----------------------------+
// | Padding |
// | (variable length, OPTIONAL) |
// +-----------------------------+
// | Footer (10 bytes, OPTIONAL) |
// +-----------------------------+
// Header
// ID3v2/file identifier "ID3"
// ID3v2 version $04 00
// ID3v2 flags (%ab000000 in v2.2, %abc00000 in v2.3, %abcd0000 in v2.4.x)
// ID3v2 size 4 * %0xxxxxxx
rewind($fd);
$header = fread($fd, 10);
if (substr($header, 0, 3) == 'ID3') {
$MP3fileInfo['id3']['id3v2']['header'] = TRUE;
$MP3fileInfo['id3']['id3v2']['majorversion'] = ord($header[3]);
$MP3fileInfo['id3']['id3v2']['minorversion'] = ord($header[4]);
}
if (isset($MP3fileInfo['id3']['id3v2']['header']) && $MP3fileInfo['id3']['id3v2']['majorversion'] <= 4) {
// this script probably won't correctly parse ID3v2.5.x and above.
$id3_flags = BigEndian2Bin($header[5]);
if ($MP3fileInfo['id3']['id3v2']['majorversion'] == 2) {
// %ab000000 in v2.2
$MP3fileInfo['id3']['id3v2']['flags']['unsynch'] = $id3_flags[0];
// a - Unsynchronisation
$MP3fileInfo['id3']['id3v2']['flags']['compression'] = $id3_flags[1];
// b - Compression
} else {
if ($MP3fileInfo['id3']['id3v2']['majorversion'] == 3) {
// %abc00000 in v2.3
$MP3fileInfo['id3']['id3v2']['flags']['unsynch'] = $id3_flags[0];
// a - Unsynchronisation
$MP3fileInfo['id3']['id3v2']['flags']['exthead'] = $id3_flags[1];
// b - Extended header
$MP3fileInfo['id3']['id3v2']['flags']['experim'] = $id3_flags[2];
// c - Experimental indicator
} else {
if ($MP3fileInfo['id3']['id3v2']['majorversion'] == 4) {
// %abcd0000 in v2.4
$MP3fileInfo['id3']['id3v2']['flags']['unsynch'] = $id3_flags[0];
// a - Unsynchronisation
$MP3fileInfo['id3']['id3v2']['flags']['exthead'] = $id3_flags[1];
// b - Extended header
$MP3fileInfo['id3']['id3v2']['flags']['experim'] = $id3_flags[2];
// c - Experimental indicator
$MP3fileInfo['id3']['id3v2']['flags']['isfooter'] = $id3_flags[3];
// d - Footer present
}
}
}
$MP3fileInfo['id3']['id3v2']['headerlength'] = BigEndian2Int(substr($header, 6, 4), 1) + ID3v2HeaderLength($MP3fileInfo['id3']['id3v2']['majorversion']);
// Extended Header
if (isset($MP3fileInfo['id3']['id3v2']['flags']['exthead']) && $MP3fileInfo['id3']['id3v2']['flags']['exthead']) {
// Extended header size 4 * %0xxxxxxx
// Number of flag bytes $01
// Extended Flags $xx
// Where the 'Extended header size' is the size of the whole extended header, stored as a 32 bit synchsafe integer.
$extheader = fread($fd, 4);
$MP3fileInfo['id3']['id3v2']['extheaderlength'] = BigEndian2Int($extheader, 1);
// The extended flags field, with its size described by 'number of flag bytes', is defined as:
// %0bcd0000
// b - Tag is an update
// Flag data length $00
// c - CRC data present
// Flag data length $05
// Total frame CRC 5 * %0xxxxxxx
// d - Tag restrictions
// Flag data length $01
$extheaderflagbytes = fread($fd, 1);
$extheaderflags = fread($fd, $extheaderflagbytes);
$id3_exthead_flags = BigEndian2Bin(substr($header, 5, 1));
$MP3fileInfo['id3']['id3v2']['exthead_flags']['update'] = substr($id3_exthead_flags, 1, 1);
$MP3fileInfo['id3']['id3v2']['exthead_flags']['CRC'] = substr($id3_exthead_flags, 2, 1);
if ($MP3fileInfo['id3']['id3v2']['exthead_flags']['CRC']) {
$extheaderrawCRC = fread($fd, 5);
$MP3fileInfo['id3']['id3v2']['exthead_flags']['CRC'] = BigEndian2Int($extheaderrawCRC, 1);
}
$MP3fileInfo['id3']['id3v2']['exthead_flags']['restrictions'] = substr($id3_exthead_flags, 3, 1);
if ($MP3fileInfo['id3']['id3v2']['exthead_flags']['restrictions']) {
// Restrictions %ppqrrstt
$extheaderrawrestrictions = fread($fd, 1);
$MP3fileInfo['id3']['id3v2']['exthead_flags']['restrictions_tagsize'] = (bindec('11000000') & ord($extheaderrawrestrictions)) >> 6;
// p - Tag size restrictions
$MP3fileInfo['id3']['id3v2']['exthead_flags']['restrictions_textenc'] = (bindec('00100000') & ord($extheaderrawrestrictions)) >> 5;
// q - Text encoding restrictions
$MP3fileInfo['id3']['id3v2']['exthead_flags']['restrictions_textsize'] = (bindec('00011000') & ord($extheaderrawrestrictions)) >> 3;
// r - Text fields size restrictions
$MP3fileInfo['id3']['id3v2']['exthead_flags']['restrictions_imgenc'] = (bindec('00000100') & ord($extheaderrawrestrictions)) >> 2;
// s - Image encoding restrictions
$MP3fileInfo['id3']['id3v2']['exthead_flags']['restrictions_imgsize'] = (bindec('00000011') & ord($extheaderrawrestrictions)) >> 0;
// t - Image size restrictions
}
}
// end extended header
// Frames
// All ID3v2 frames consists of one frame header followed by one or more
// fields containing the actual information. The header is always 10
// bytes and laid out as follows:
//
// Frame ID $xx xx xx xx (four characters)
// Size 4 * %0xxxxxxx
// Flags $xx xx
$sizeofframes = $MP3fileInfo['id3']['id3v2']['headerlength'] - ID3v2HeaderLength($MP3fileInfo['id3']['id3v2']['majorversion']);
if (isset($MP3fileInfo['id3']['id3v2']['extheaderlength'])) {
$sizeofframes -= $MP3fileInfo['id3']['id3v2']['extheaderlength'];
}
if (isset($MP3fileInfo['id3']['id3v2']['flags']['isfooter']) && $MP3fileInfo['id3']['id3v2']['flags']['isfooter']) {
$sizeofframes -= 10;
// footer takes last 10 bytes of ID3v2 header, after frame data, before audio
}
if ($sizeofframes > 0) {
$framedata = fread($fd, $sizeofframes);
// read all frames from file into $framedata variable
// if entire frame data is unsynched, de-unsynch it now (ID3v2.3.x)
if (isset($MP3fileInfo['id3']['id3v2']['flags']['unsynch']) && $MP3fileInfo['id3']['id3v2']['flags']['unsynch'] && $MP3fileInfo['id3']['id3v2']['majorversion'] <= 3) {
$framedata = DeUnSynchronise($framedata);
}
// [in ID3v2.4.0] Unsynchronisation [S:6.1] is done on frame level, instead
// of on tag level, making it easier to skip frames, increasing the streamability
// of the tag. The unsynchronisation flag in the header [S:3.1] indicates that
// there exists an unsynchronised frame, while the new unsynchronisation flag in
// the frame header [S:4.1.2] indicates unsynchronisation.
include_once GETID3_INCLUDEPATH . 'getid3.frames.php';
// ID3v2FrameProcessing()
$framedataoffset = 10;
// how many bytes into the stream - start from after the 10-byte header
while (isset($framedata) && strlen($framedata) > 0) {
// cycle through until no more frame data is left to parse
if ($MP3fileInfo['id3']['id3v2']['majorversion'] == 2) {
// Frame ID $xx xx xx (three characters)
// Size $xx xx xx (24-bit integer)
// Flags $xx xx
$frame_header = substr($framedata, 0, 6);
// take next 6 bytes for header
$framedata = substr($framedata, 6);
// and leave the rest in $framedata
$frame_name = substr($frame_header, 0, 3);
$frame_size = BigEndian2Int(substr($frame_header, 3, 3), 0);
$frame_flags = '';
// not used for anything, just to avoid E_NOTICEs
} else {
if ($MP3fileInfo['id3']['id3v2']['majorversion'] > 2) {
// Frame ID $xx xx xx xx (four characters)
// Size $xx xx xx xx (32-bit integer in v2.3, 28-bit synchsafe in v2.4+)
// Flags $xx xx
$frame_header = substr($framedata, 0, 10);
// take next 10 bytes for header
$framedata = substr($framedata, 10);
// and leave the rest in $framedata
$frame_name = substr($frame_header, 0, 4);
if ($MP3fileInfo['id3']['id3v2']['majorversion'] == 3) {
$frame_size = BigEndian2Int(substr($frame_header, 4, 4), 0);
// 32-bit integer
} else {
// ID3v2.4+
$frame_size = BigEndian2Int(substr($frame_header, 4, 4), 1);
// 32-bit synchsafe integer (28-bit value)
}
if ($frame_size < strlen($framedata) + 4) {
$nextFrameID = substr($framedata, $frame_size, 4);
if (IsValidID3v2FrameName($nextFrameID, $MP3fileInfo['id3']['id3v2']['majorversion'])) {
// next frame is OK
} else {
if ($frame_name == chr(0) . 'MP3' || $frame_name == ' MP3' || $frame_name == 'MP3e') {
// MP3ext known broken frames - "ok" for the purposes of this test
} else {
if ($MP3fileInfo['id3']['id3v2']['majorversion'] == 4 && IsValidID3v2FrameName(substr($framedata, BigEndian2Int(substr($frame_header, 4, 4), 0), 4), 3)) {
$MP3fileInfo['error'] .= "\n" . 'ID3v2 tag written as ID3v2.4, but with non-synchsafe integers (ID3v2.3 style). Older versions of Helium2 (www.helium2.com) is a known culprit of this. Tag has been parsed as ID3v2.3';
$MP3fileInfo['id3']['id3v2']['majorversion'] = 3;
$frame_size = BigEndian2Int(substr($frame_header, 4, 4), 0);
// 32-bit integer
}
}
}
}
$frame_flags = BigEndian2Bin(substr($frame_header, 8, 2));
}
}
if ($frame_name == chr(0) . chr(0) . chr(0) . chr(0)) {
// padding encountered
// $MP3fileInfo['id3']['id3v2']['padding']['start'] = $MP3fileInfo['id3']['id3v2']['headerlength'] - strlen($framedata);
$MP3fileInfo['id3']['id3v2']['padding']['start'] = $framedataoffset;
$MP3fileInfo['id3']['id3v2']['padding']['length'] = strlen($framedata);
$MP3fileInfo['id3']['id3v2']['padding']['valid'] = TRUE;
for ($i = 0; $i < $MP3fileInfo['id3']['id3v2']['padding']['length']; $i++) {
if (substr($framedata, $i, 1) != chr(0)) {
$MP3fileInfo['id3']['id3v2']['padding']['valid'] = FALSE;
$MP3fileInfo['id3']['id3v2']['padding']['errorpos'] = $MP3fileInfo['id3']['id3v2']['padding']['start'] + $i;
break;
}
}
break;
// skip rest of ID3v2 header
}
if ($frame_size <= strlen($framedata) && IsValidID3v2FrameName($frame_name, $MP3fileInfo['id3']['id3v2']['majorversion'])) {
$MP3fileInfo['id3']['id3v2']["{$frame_name}"]['data'] = substr($framedata, 0, $frame_size);
$MP3fileInfo['id3']['id3v2']["{$frame_name}"]['datalength'] = CastAsInt($frame_size);
$MP3fileInfo['id3']['id3v2']["{$frame_name}"]['dataoffset'] = $framedataoffset;
$framedata = substr($framedata, $frame_size);
// in getid3.frames.php - this function does all the FrameID-level parsing
ID3v2FrameProcessing($frame_name, $frame_flags, $MP3fileInfo);
$framedataoffset += $frame_size + ID3v2HeaderLength($MP3fileInfo['id3']['id3v2']['majorversion']);
} else {
// invalid frame length or FrameID
$MP3fileInfo['error'] .= "\n" . 'error parsing "' . $frame_name . '" (' . $framedataoffset . ' bytes into the ID3v2.' . $MP3fileInfo['id3']['id3v2']['majorversion'] . ' tag).';
if ($frame_size > strlen($framedata)) {
$MP3fileInfo['error'] .= ' (ERROR: $frame_size (' . $frame_size . ') > strlen($framedata) (' . strlen($framedata) . ')).';
}
if (!IsValidID3v2FrameName($frame_name, $MP3fileInfo['id3']['id3v2']['majorversion'])) {
$MP3fileInfo['error'] .= ' (ERROR: !IsValidID3v2FrameName("' . str_replace(chr(0), ' ', $frame_name) . '", ' . $MP3fileInfo['id3']['id3v2']['majorversion'] . '))).';
if ($frame_name == chr(0) . 'MP3' || $frame_name == ' MP3' || $frame_name == 'MP3e') {
$MP3fileInfo['error'] .= ' [Note: this particular error has been known to happen with tags edited by "MP3ext V3.3.17(unicode)"]';
} else {
if ($frame_name == 'COM ') {
$MP3fileInfo['error'] .= ' [Note: this particular error has been known to happen with tags edited by "iTunes X v2.0.3"]';
}
}
}
if ($frame_size <= strlen($framedata) && IsValidID3v2FrameName(substr($framedata, $frame_size, 4), $MP3fileInfo['id3']['id3v2']['majorversion'])) {
// next frame is valid, just skip the current frame
$framedata = substr($framedata, $frame_size);
} else {
// next frame is invalid too, abort processing
unset($framedata);
}
}
}
}
// Footer
// The footer is a copy of the header, but with a different identifier.
// ID3v2 identifier "3DI"
// ID3v2 version $04 00
// ID3v2 flags %abcd0000
// ID3v2 size 4 * %0xxxxxxx
if (isset($MP3fileInfo['id3']['id3v2']['flags']['isfooter']) && $MP3fileInfo['id3']['id3v2']['flags']['isfooter']) {
$footer = fread($fd, 10);
if (substr($footer, 0, 3) == '3DI') {
$MP3fileInfo['id3']['id3v2']['footer'] = true;
$MP3fileInfo['id3']['id3v2']['majorversion_footer'] = ord(substr($footer, 3, 1));
$MP3fileInfo['id3']['id3v2']['minorversion_footer'] = ord(substr($footer, 4, 1));
}
if ($MP3fileInfo['id3']['id3v2']['majorversion_footer'] <= 4) {
$id3_flags = BigEndian2Bin(substr($footer, 5, 1));
$MP3fileInfo['id3']['id3v2']['flags']['unsynch_footer'] = substr($id3_flags, 0, 1);
$MP3fileInfo['id3']['id3v2']['flags']['extfoot_footer'] = substr($id3_flags, 1, 1);
$MP3fileInfo['id3']['id3v2']['flags']['experim_footer'] = substr($id3_flags, 2, 1);
$MP3fileInfo['id3']['id3v2']['flags']['isfooter_footer'] = substr($id3_flags, 3, 1);
$MP3fileInfo['id3']['id3v2']['footerlength'] = BigEndian2Int(substr($footer, 6, 4), 1);
}
}
// end footer
// Translate most common ID3v2 FrameIDs to easier-to-understand names
if ($MP3fileInfo['id3']['id3v2']['majorversion'] == 2) {
if (isset($MP3fileInfo['id3']['id3v2']['TT2'])) {
$MP3fileInfo['id3']['id3v2']['title'] = $MP3fileInfo['id3']['id3v2']['TT2']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TP1'])) {
$MP3fileInfo['id3']['id3v2']['artist'] = $MP3fileInfo['id3']['id3v2']['TP1']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TAL'])) {
$MP3fileInfo['id3']['id3v2']['album'] = $MP3fileInfo['id3']['id3v2']['TAL']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TYE'])) {
$MP3fileInfo['id3']['id3v2']['year'] = $MP3fileInfo['id3']['id3v2']['TYE']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TRK'])) {
$MP3fileInfo['id3']['id3v2']['track'] = $MP3fileInfo['id3']['id3v2']['TRK']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TCO'])) {
$MP3fileInfo['id3']['id3v2']['genre'] = $MP3fileInfo['id3']['id3v2']['TCO']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['COM'][0]['asciidata'])) {
$MP3fileInfo['id3']['id3v2']['comment'] = $MP3fileInfo['id3']['id3v2']['COM'][0]['asciidata'];
}
} else {
// $MP3fileInfo['id3']['id3v2']['majorversion'] > 2
if (isset($MP3fileInfo['id3']['id3v2']['TIT2'])) {
$MP3fileInfo['id3']['id3v2']['title'] = $MP3fileInfo['id3']['id3v2']['TIT2']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TPE1'])) {
$MP3fileInfo['id3']['id3v2']['artist'] = $MP3fileInfo['id3']['id3v2']['TPE1']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TALB'])) {
$MP3fileInfo['id3']['id3v2']['album'] = $MP3fileInfo['id3']['id3v2']['TALB']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TYER'])) {
$MP3fileInfo['id3']['id3v2']['year'] = $MP3fileInfo['id3']['id3v2']['TYER']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TRCK'])) {
$MP3fileInfo['id3']['id3v2']['track'] = $MP3fileInfo['id3']['id3v2']['TRCK']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['TCON'])) {
$MP3fileInfo['id3']['id3v2']['genre'] = $MP3fileInfo['id3']['id3v2']['TCON']['asciidata'];
}
if (isset($MP3fileInfo['id3']['id3v2']['COMM'][0]['asciidata'])) {
$MP3fileInfo['id3']['id3v2']['comment'] = $MP3fileInfo['id3']['id3v2']['COMM'][0]['asciidata'];
}
}
if (isset($MP3fileInfo['id3']['id3v2']['genre'])) {
$MP3fileInfo['id3']['id3v2']['genrelist'] = ParseID3v2GenreString($MP3fileInfo['id3']['id3v2']['genre']);
if ($MP3fileInfo['id3']['id3v2']['genrelist']['genreid'][0] !== '') {
$MP3fileInfo['id3']['id3v2']['genreid'] = $MP3fileInfo['id3']['id3v2']['genrelist']['genreid'][0];
}
$MP3fileInfo['id3']['id3v2']['genre'] = $MP3fileInfo['id3']['id3v2']['genrelist']['genre'][0];
}
if (isset($MP3fileInfo['id3']['id3v2']['track']) && strpos($MP3fileInfo['id3']['id3v2']['track'], '/') !== FALSE) {
$tracktotaltracks = explode('/', $MP3fileInfo['id3']['id3v2']['track']);
$MP3fileInfo['id3']['id3v2']['track'] = $tracktotaltracks[0];
$MP3fileInfo['id3']['id3v2']['totaltracks'] = $tracktotaltracks[1];
}
} else {
// MajorVersion is > 4, or no ID3v2 header present
if (isset($MP3fileInfo['id3']['id3v2']['header'])) {
// MajorVersion is > 4
$MP3fileInfo['error'] .= "\n" . 'this script only parses up to ID3v2.4.x - this tag is ID3v2.' . $MP3fileInfo['id3']['id3v2']['majorversion'] . '.' . $MP3fileInfo['id3']['id3v2']['minorversion'];
} else {
// no ID3v2 header present - this is fine, just don't process anything.
}
}
return TRUE;
}