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|
<?php
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2 of the GPL license, |
// | that is bundled with this package in the file license.txt and is |
// | available through the world-wide-web at the following url: |
// | http://www.gnu.org/copyleft/gpl.html |
// +----------------------------------------------------------------------+
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
// +----------------------------------------------------------------------+
// | Authors: James Heinrich <info�getid3*org> |
// | Allan Hansen <ah�artemis*dk> |
// +----------------------------------------------------------------------+
// | module.tag.apetag.php |
// | module for analyzing APE tags |
// | dependencies: NONE |
// +----------------------------------------------------------------------+
//
// $Id: module.tag.apetag.php,v 1.5 2006/11/16 14:05:21 ah Exp $
class getid3_apetag extends getid3_handler
{
/*
ID3v1_TAG_SIZE = 128;
APETAG_HEADER_SIZE = 32;
LYRICS3_TAG_SIZE = 10;
*/
public $option_override_end_offset = 0;
public function Analyze() {
$getid3 = $this->getid3;
if ($this->option_override_end_offset == 0) {
fseek($getid3->fp, 0 - 170, SEEK_END); // 170 = ID3v1_TAG_SIZE + APETAG_HEADER_SIZE + LYRICS3_TAG_SIZE
$apetag_footer_id3v1 = fread($getid3->fp, 170); // 170 = ID3v1_TAG_SIZE + APETAG_HEADER_SIZE + LYRICS3_TAG_SIZE
// APE tag found before ID3v1
if (substr($apetag_footer_id3v1, strlen($apetag_footer_id3v1) - 160, 8) == 'APETAGEX') { // 160 = ID3v1_TAG_SIZE + APETAG_HEADER_SIZE
$getid3->info['ape']['tag_offset_end'] = filesize($getid3->filename) - 128; // 128 = ID3v1_TAG_SIZE
}
// APE tag found, no ID3v1
elseif (substr($apetag_footer_id3v1, strlen($apetag_footer_id3v1) - 32, 8) == 'APETAGEX') { // 32 = APETAG_HEADER_SIZE
$getid3->info['ape']['tag_offset_end'] = filesize($getid3->filename);
}
}
else {
fseek($getid3->fp, $this->option_override_end_offset - 32, SEEK_SET); // 32 = APETAG_HEADER_SIZE
if (fread($getid3->fp, 8) == 'APETAGEX') {
$getid3->info['ape']['tag_offset_end'] = $this->option_override_end_offset;
}
}
// APE tag not found
if (!@$getid3->info['ape']['tag_offset_end']) {
return false;
}
// Shortcut
$info_ape = &$getid3->info['ape'];
// Read and parse footer
fseek($getid3->fp, $info_ape['tag_offset_end'] - 32, SEEK_SET); // 32 = APETAG_HEADER_SIZE
$apetag_footer_data = fread($getid3->fp, 32);
if (!($this->ParseAPEHeaderFooter($apetag_footer_data, $info_ape['footer']))) {
throw new getid3_exception('Error parsing APE footer at offset '.$info_ape['tag_offset_end']);
}
if (isset($info_ape['footer']['flags']['header']) && $info_ape['footer']['flags']['header']) {
fseek($getid3->fp, $info_ape['tag_offset_end'] - $info_ape['footer']['raw']['tagsize'] - 32, SEEK_SET);
$info_ape['tag_offset_start'] = ftell($getid3->fp);
$apetag_data = fread($getid3->fp, $info_ape['footer']['raw']['tagsize'] + 32);
}
else {
$info_ape['tag_offset_start'] = $info_ape['tag_offset_end'] - $info_ape['footer']['raw']['tagsize'];
fseek($getid3->fp, $info_ape['tag_offset_start'], SEEK_SET);
$apetag_data = fread($getid3->fp, $info_ape['footer']['raw']['tagsize']);
}
$getid3->info['avdataend'] = $info_ape['tag_offset_start'];
if (isset($getid3->info['id3v1']['tag_offset_start']) && ($getid3->info['id3v1']['tag_offset_start'] < $info_ape['tag_offset_end'])) {
$getid3->warning('ID3v1 tag information ignored since it appears to be a false synch in APEtag data');
unset($getid3->info['id3v1']);
}
$offset = 0;
if (isset($info_ape['footer']['flags']['header']) && $info_ape['footer']['flags']['header']) {
if (!$this->ParseAPEHeaderFooter(substr($apetag_data, 0, 32), $info_ape['header'])) {
throw new getid3_exception('Error parsing APE header at offset '.$info_ape['tag_offset_start']);
}
$offset = 32;
}
// Shortcut
$getid3->info['replay_gain'] = array ();
$info_replaygain = &$getid3->info['replay_gain'];
for ($i = 0; $i < $info_ape['footer']['raw']['tag_items']; $i++) {
$value_size = getid3_lib::LittleEndian2Int(substr($apetag_data, $offset, 4));
$item_flags = getid3_lib::LittleEndian2Int(substr($apetag_data, $offset + 4, 4));
$offset += 8;
if (strstr(substr($apetag_data, $offset), "\x00") === false) {
throw new getid3_exception('Cannot find null-byte (0x00) seperator between ItemKey #'.$i.' and value. ItemKey starts ' . $offset . ' bytes into the APE tag, at file offset '.($info_ape['tag_offset_start'] + $offset));
}
$item_key_length = strpos($apetag_data, "\x00", $offset) - $offset;
$item_key = strtolower(substr($apetag_data, $offset, $item_key_length));
// Shortcut
$info_ape['items'][$item_key] = array ();
$info_ape_items_current = &$info_ape['items'][$item_key];
$offset += $item_key_length + 1; // skip 0x00 terminator
$info_ape_items_current['data'] = substr($apetag_data, $offset, $value_size);
$offset += $value_size;
$info_ape_items_current['flags'] = $this->ParseAPEtagFlags($item_flags);
switch ($info_ape_items_current['flags']['item_contents_raw']) {
case 0: // UTF-8
case 3: // Locator (URL, filename, etc), UTF-8 encoded
$info_ape_items_current['data'] = explode("\x00", trim($info_ape_items_current['data']));
break;
default: // binary data
break;
}
switch (strtolower($item_key)) {
case 'replaygain_track_gain':
$info_replaygain['track']['adjustment'] = (float)str_replace(',', '.', $info_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
$info_replaygain['track']['originator'] = 'unspecified';
break;
case 'replaygain_track_peak':
$info_replaygain['track']['peak'] = (float)str_replace(',', '.', $info_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
$info_replaygain['track']['originator'] = 'unspecified';
if ($info_replaygain['track']['peak'] <= 0) {
$getid3->warning('ReplayGain Track peak from APEtag appears invalid: '.$info_replaygain['track']['peak'].' (original value = "'.$info_ape_items_current['data'][0].'")');
}
break;
case 'replaygain_album_gain':
$info_replaygain['album']['adjustment'] = (float)str_replace(',', '.', $info_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
$info_replaygain['album']['originator'] = 'unspecified';
break;
case 'replaygain_album_peak':
$info_replaygain['album']['peak'] = (float)str_replace(',', '.', $info_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
$info_replaygain['album']['originator'] = 'unspecified';
if ($info_replaygain['album']['peak'] <= 0) {
$getid3->warning('ReplayGain Album peak from APEtag appears invalid: '.$info_replaygain['album']['peak'].' (original value = "'.$info_ape_items_current['data'][0].'")');
}
break;
case 'mp3gain_undo':
list($mp3gain_undo_left, $mp3gain_undo_right, $mp3gain_undo_wrap) = explode(',', $info_ape_items_current['data'][0]);
$info_replaygain['mp3gain']['undo_left'] = intval($mp3gain_undo_left);
$info_replaygain['mp3gain']['undo_right'] = intval($mp3gain_undo_right);
$info_replaygain['mp3gain']['undo_wrap'] = (($mp3gain_undo_wrap == 'Y') ? true : false);
break;
case 'mp3gain_minmax':
list($mp3gain_globalgain_min, $mp3gain_globalgain_max) = explode(',', $info_ape_items_current['data'][0]);
$info_replaygain['mp3gain']['globalgain_track_min'] = intval($mp3gain_globalgain_min);
$info_replaygain['mp3gain']['globalgain_track_max'] = intval($mp3gain_globalgain_max);
break;
case 'mp3gain_album_minmax':
list($mp3gain_globalgain_album_min, $mp3gain_globalgain_album_max) = explode(',', $info_ape_items_current['data'][0]);
$info_replaygain['mp3gain']['globalgain_album_min'] = intval($mp3gain_globalgain_album_min);
$info_replaygain['mp3gain']['globalgain_album_max'] = intval($mp3gain_globalgain_album_max);
break;
case 'tracknumber':
foreach ($info_ape_items_current['data'] as $comment) {
$info_ape['comments']['track'][] = $comment;
}
break;
default:
foreach ($info_ape_items_current['data'] as $comment) {
$info_ape['comments'][strtolower($item_key)][] = $comment;
}
break;
}
}
if (empty($info_replaygain)) {
unset($getid3->info['replay_gain']);
}
return true;
}
protected function ParseAPEheaderFooter($data, &$target) {
// http://www.uni-jena.de/~pfk/mpp/sv8/apeheader.html
if (substr($data, 0, 8) != 'APETAGEX') {
return false;
}
// shortcut
$target['raw'] = array ();
$target_raw = &$target['raw'];
$target_raw['footer_tag'] = 'APETAGEX';
getid3_lib::ReadSequence("LittleEndian2Int", $target_raw, $data, 8,
array (
'version' => 4,
'tagsize' => 4,
'tag_items' => 4,
'global_flags' => 4
)
);
$target_raw['reserved'] = substr($data, 24, 8);
$target['tag_version'] = $target_raw['version'] / 1000;
if ($target['tag_version'] >= 2) {
$target['flags'] = $this->ParseAPEtagFlags($target_raw['global_flags']);
}
return true;
}
protected function ParseAPEtagFlags($raw_flag_int) {
// "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
$target['header'] = (bool) ($raw_flag_int & 0x80000000);
$target['footer'] = (bool) ($raw_flag_int & 0x40000000);
$target['this_is_header'] = (bool) ($raw_flag_int & 0x20000000);
$target['item_contents_raw'] = ($raw_flag_int & 0x00000006) >> 1;
$target['read_only'] = (bool) ($raw_flag_int & 0x00000001);
$target['item_contents'] = getid3_apetag::APEcontentTypeFlagLookup($target['item_contents_raw']);
return $target;
}
public static function APEcontentTypeFlagLookup($content_type_id) {
static $lookup = array (
0 => 'utf-8',
1 => 'binary',
2 => 'external',
3 => 'reserved'
);
return (isset($lookup[$content_type_id]) ? $lookup[$content_type_id] : 'invalid');
}
public static function APEtagItemIsUTF8Lookup($item_key) {
static $lookup = array (
'title',
'subtitle',
'artist',
'album',
'debut album',
'publisher',
'conductor',
'track',
'composer',
'comment',
'copyright',
'publicationright',
'file',
'year',
'record date',
'record location',
'genre',
'media',
'related',
'isrc',
'abstract',
'language',
'bibliography'
);
return in_array(strtolower($item_key), $lookup);
}
}
?>
|
