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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.tag.apetag.php //
// module for analyzing APE tags //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
class getid3_apetag
{
function getid3_apetag(&$fd, &$ThisFileInfo, $overrideendoffset=0) {
if ($ThisFileInfo['filesize'] >= pow(2, 31)) {
$ThisFileInfo['warning'][] = 'Unable to check for APEtags because file is larger than 2GB';
return false;
}
$id3v1tagsize = 128;
$apetagheadersize = 32;
$lyrics3tagsize = 10;
if ($overrideendoffset == 0) {
fseek($fd, 0 - $id3v1tagsize - $apetagheadersize - $lyrics3tagsize, SEEK_END);
$APEfooterID3v1 = fread($fd, $id3v1tagsize + $apetagheadersize + $lyrics3tagsize);
//if (preg_match('/APETAGEX.{24}TAG.{125}$/i', $APEfooterID3v1)) {
if (substr($APEfooterID3v1, strlen($APEfooterID3v1) - $id3v1tagsize - $apetagheadersize, 8) == 'APETAGEX') {
// APE tag found before ID3v1
$ThisFileInfo['ape']['tag_offset_end'] = $ThisFileInfo['filesize'] - $id3v1tagsize;
//} elseif (preg_match('/APETAGEX.{24}$/i', $APEfooterID3v1)) {
} elseif (substr($APEfooterID3v1, strlen($APEfooterID3v1) - $apetagheadersize, 8) == 'APETAGEX') {
// APE tag found, no ID3v1
$ThisFileInfo['ape']['tag_offset_end'] = $ThisFileInfo['filesize'];
}
} else {
fseek($fd, $overrideendoffset - $apetagheadersize, SEEK_SET);
if (fread($fd, 8) == 'APETAGEX') {
$ThisFileInfo['ape']['tag_offset_end'] = $overrideendoffset;
}
}
if (!isset($ThisFileInfo['ape']['tag_offset_end'])) {
// APE tag not found
unset($ThisFileInfo['ape']);
return false;
}
// shortcut
$thisfile_ape = &$ThisFileInfo['ape'];
fseek($fd, $thisfile_ape['tag_offset_end'] - $apetagheadersize, SEEK_SET);
$APEfooterData = fread($fd, 32);
if (!($thisfile_ape['footer'] = $this->parseAPEheaderFooter($APEfooterData))) {
$ThisFileInfo['error'][] = 'Error parsing APE footer at offset '.$thisfile_ape['tag_offset_end'];
return false;
}
if (isset($thisfile_ape['footer']['flags']['header']) && $thisfile_ape['footer']['flags']['header']) {
fseek($fd, $thisfile_ape['tag_offset_end'] - $thisfile_ape['footer']['raw']['tagsize'] - $apetagheadersize, SEEK_SET);
$thisfile_ape['tag_offset_start'] = ftell($fd);
$APEtagData = fread($fd, $thisfile_ape['footer']['raw']['tagsize'] + $apetagheadersize);
} else {
$thisfile_ape['tag_offset_start'] = $thisfile_ape['tag_offset_end'] - $thisfile_ape['footer']['raw']['tagsize'];
fseek($fd, $thisfile_ape['tag_offset_start'], SEEK_SET);
$APEtagData = fread($fd, $thisfile_ape['footer']['raw']['tagsize']);
}
$ThisFileInfo['avdataend'] = $thisfile_ape['tag_offset_start'];
if (isset($ThisFileInfo['id3v1']['tag_offset_start']) && ($ThisFileInfo['id3v1']['tag_offset_start'] < $thisfile_ape['tag_offset_end'])) {
$ThisFileInfo['warning'][] = 'ID3v1 tag information ignored since it appears to be a false synch in APEtag data';
unset($ThisFileInfo['id3v1']);
foreach ($ThisFileInfo['warning'] as $key => $value) {
if ($value == 'Some ID3v1 fields do not use NULL characters for padding') {
unset($ThisFileInfo['warning'][$key]);
sort($ThisFileInfo['warning']);
break;
}
}
}
$offset = 0;
if (isset($thisfile_ape['footer']['flags']['header']) && $thisfile_ape['footer']['flags']['header']) {
if ($thisfile_ape['header'] = $this->parseAPEheaderFooter(substr($APEtagData, 0, $apetagheadersize))) {
$offset += $apetagheadersize;
} else {
$ThisFileInfo['error'][] = 'Error parsing APE header at offset '.$thisfile_ape['tag_offset_start'];
return false;
}
}
// shortcut
$ThisFileInfo['replay_gain'] = array();
$thisfile_replaygain = &$ThisFileInfo['replay_gain'];
for ($i = 0; $i < $thisfile_ape['footer']['raw']['tag_items']; $i++) {
$value_size = getid3_lib::LittleEndian2Int(substr($APEtagData, $offset, 4));
$offset += 4;
$item_flags = getid3_lib::LittleEndian2Int(substr($APEtagData, $offset, 4));
$offset += 4;
if (strstr(substr($APEtagData, $offset), "\x00") === false) {
$ThisFileInfo['error'][] = 'Cannot find null-byte (0x00) seperator between ItemKey #'.$i.' and value. ItemKey starts '.$offset.' bytes into the APE tag, at file offset '.($thisfile_ape['tag_offset_start'] + $offset);
return false;
}
$ItemKeyLength = strpos($APEtagData, "\x00", $offset) - $offset;
$item_key = strtolower(substr($APEtagData, $offset, $ItemKeyLength));
// shortcut
$thisfile_ape['items'][$item_key] = array();
$thisfile_ape_items_current = &$thisfile_ape['items'][$item_key];
$offset += ($ItemKeyLength + 1); // skip 0x00 terminator
$thisfile_ape_items_current['data'] = substr($APEtagData, $offset, $value_size);
$offset += $value_size;
$thisfile_ape_items_current['flags'] = $this->parseAPEtagFlags($item_flags);
switch ($thisfile_ape_items_current['flags']['item_contents_raw']) {
case 0: // UTF-8
case 3: // Locator (URL, filename, etc), UTF-8 encoded
$thisfile_ape_items_current['data'] = explode("\x00", trim($thisfile_ape_items_current['data']));
break;
default: // binary data
break;
}
switch (strtolower($item_key)) {
case 'replaygain_track_gain':
$thisfile_replaygain['track']['adjustment'] = (float) str_replace(',', '.', $thisfile_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
$thisfile_replaygain['track']['originator'] = 'unspecified';
break;
case 'replaygain_track_peak':
$thisfile_replaygain['track']['peak'] = (float) str_replace(',', '.', $thisfile_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
$thisfile_replaygain['track']['originator'] = 'unspecified';
if ($thisfile_replaygain['track']['peak'] <= 0) {
$ThisFileInfo['warning'][] = 'ReplayGain Track peak from APEtag appears invalid: '.$thisfile_replaygain['track']['peak'].' (original value = "'.$thisfile_ape_items_current['data'][0].'")';
}
break;
case 'replaygain_album_gain':
$thisfile_replaygain['album']['adjustment'] = (float) str_replace(',', '.', $thisfile_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
$thisfile_replaygain['album']['originator'] = 'unspecified';
break;
case 'replaygain_album_peak':
$thisfile_replaygain['album']['peak'] = (float) str_replace(',', '.', $thisfile_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
$thisfile_replaygain['album']['originator'] = 'unspecified';
if ($thisfile_replaygain['album']['peak'] <= 0) {
$ThisFileInfo['warning'][] = 'ReplayGain Album peak from APEtag appears invalid: '.$thisfile_replaygain['album']['peak'].' (original value = "'.$thisfile_ape_items_current['data'][0].'")';
}
break;
case 'mp3gain_undo':
list($mp3gain_undo_left, $mp3gain_undo_right, $mp3gain_undo_wrap) = explode(',', $thisfile_ape_items_current['data'][0]);
$thisfile_replaygain['mp3gain']['undo_left'] = intval($mp3gain_undo_left);
$thisfile_replaygain['mp3gain']['undo_right'] = intval($mp3gain_undo_right);
$thisfile_replaygain['mp3gain']['undo_wrap'] = (($mp3gain_undo_wrap == 'Y') ? true : false);
break;
case 'mp3gain_minmax':
list($mp3gain_globalgain_min, $mp3gain_globalgain_max) = explode(',', $thisfile_ape_items_current['data'][0]);
$thisfile_replaygain['mp3gain']['globalgain_track_min'] = intval($mp3gain_globalgain_min);
$thisfile_replaygain['mp3gain']['globalgain_track_max'] = intval($mp3gain_globalgain_max);
break;
case 'mp3gain_album_minmax':
list($mp3gain_globalgain_album_min, $mp3gain_globalgain_album_max) = explode(',', $thisfile_ape_items_current['data'][0]);
$thisfile_replaygain['mp3gain']['globalgain_album_min'] = intval($mp3gain_globalgain_album_min);
$thisfile_replaygain['mp3gain']['globalgain_album_max'] = intval($mp3gain_globalgain_album_max);
break;
case 'tracknumber':
foreach ($thisfile_ape_items_current['data'] as $comment) {
$thisfile_ape['comments']['track'][] = $comment;
}
break;
default:
foreach ($thisfile_ape_items_current['data'] as $comment) {
$thisfile_ape['comments'][strtolower($item_key)][] = $comment;
}
break;
}
}
if (empty($thisfile_replaygain)) {
unset($ThisFileInfo['replay_gain']);
}
return true;
}
function parseAPEheaderFooter($APEheaderFooterData) {
// http://www.uni-jena.de/~pfk/mpp/sv8/apeheader.html
// shortcut
$headerfooterinfo['raw'] = array();
$headerfooterinfo_raw = &$headerfooterinfo['raw'];
$headerfooterinfo_raw['footer_tag'] = substr($APEheaderFooterData, 0, 8);
if ($headerfooterinfo_raw['footer_tag'] != 'APETAGEX') {
return false;
}
$headerfooterinfo_raw['version'] = getid3_lib::LittleEndian2Int(substr($APEheaderFooterData, 8, 4));
$headerfooterinfo_raw['tagsize'] = getid3_lib::LittleEndian2Int(substr($APEheaderFooterData, 12, 4));
$headerfooterinfo_raw['tag_items'] = getid3_lib::LittleEndian2Int(substr($APEheaderFooterData, 16, 4));
$headerfooterinfo_raw['global_flags'] = getid3_lib::LittleEndian2Int(substr($APEheaderFooterData, 20, 4));
$headerfooterinfo_raw['reserved'] = substr($APEheaderFooterData, 24, 8);
$headerfooterinfo['tag_version'] = $headerfooterinfo_raw['version'] / 1000;
if ($headerfooterinfo['tag_version'] >= 2) {
$headerfooterinfo['flags'] = $this->parseAPEtagFlags($headerfooterinfo_raw['global_flags']);
}
return $headerfooterinfo;
}
function parseAPEtagFlags($rawflagint) {
// "Note: APE Tags 1.0 do not use any of the APE Tag flags.
// All are set to zero on creation and ignored on reading."
// http://www.uni-jena.de/~pfk/mpp/sv8/apetagflags.html
$flags['header'] = (bool) ($rawflagint & 0x80000000);
$flags['footer'] = (bool) ($rawflagint & 0x40000000);
$flags['this_is_header'] = (bool) ($rawflagint & 0x20000000);
$flags['item_contents_raw'] = ($rawflagint & 0x00000006) >> 1;
$flags['read_only'] = (bool) ($rawflagint & 0x00000001);
$flags['item_contents'] = $this->APEcontentTypeFlagLookup($flags['item_contents_raw']);
return $flags;
}
function APEcontentTypeFlagLookup($contenttypeid) {
static $APEcontentTypeFlagLookup = array(
0 => 'utf-8',
1 => 'binary',
2 => 'external',
3 => 'reserved'
);
return (isset($APEcontentTypeFlagLookup[$contenttypeid]) ? $APEcontentTypeFlagLookup[$contenttypeid] : 'invalid');
}
function APEtagItemIsUTF8Lookup($itemkey) {
static $APEtagItemIsUTF8Lookup = array(
'title',
'subtitle',
'artist',
'album',
'debut album',
'publisher',
'conductor',
'track',
'composer',
'comment',
'copyright',
'publicationright',
'file',
'year',
'record date',
'record location',
'genre',
'media',
'related',
'isrc',
'abstract',
'language',
'bibliography'
);
return in_array(strtolower($itemkey), $APEtagItemIsUTF8Lookup);
}
}
?>
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