mirror of
https://github.com/Yetangitu/ampache
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312 lines
No EOL
13 KiB
PHP
312 lines
No EOL
13 KiB
PHP
<?php
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// +----------------------------------------------------------------------+
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// | PHP version 5 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2 of the GPL license, |
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// | that is bundled with this package in the file license.txt and is |
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// | available through the world-wide-web at the following url: |
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// | http://www.gnu.org/copyleft/gpl.html |
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// +----------------------------------------------------------------------+
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// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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// +----------------------------------------------------------------------+
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// | Authors: James Heinrich <infoØgetid3*org> |
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// | Allan Hansen <ahØartemis*dk> |
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// +----------------------------------------------------------------------+
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// | module.tag.apetag.php |
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// | module for analyzing APE tags |
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// | dependencies: NONE |
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// +----------------------------------------------------------------------+
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//
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// $Id: module.tag.apetag.php,v 1.5 2006/11/16 14:05:21 ah Exp $
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class getid3_apetag extends getid3_handler
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{
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/*
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ID3v1_TAG_SIZE = 128;
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APETAG_HEADER_SIZE = 32;
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LYRICS3_TAG_SIZE = 10;
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*/
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public $option_override_end_offset = 0;
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public function Analyze() {
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$getid3 = $this->getid3;
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if ($this->option_override_end_offset == 0) {
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fseek($getid3->fp, 0 - 170, SEEK_END); // 170 = ID3v1_TAG_SIZE + APETAG_HEADER_SIZE + LYRICS3_TAG_SIZE
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$apetag_footer_id3v1 = fread($getid3->fp, 170); // 170 = ID3v1_TAG_SIZE + APETAG_HEADER_SIZE + LYRICS3_TAG_SIZE
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// APE tag found before ID3v1
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if (substr($apetag_footer_id3v1, strlen($apetag_footer_id3v1) - 160, 8) == 'APETAGEX') { // 160 = ID3v1_TAG_SIZE + APETAG_HEADER_SIZE
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$getid3->info['ape']['tag_offset_end'] = filesize($getid3->filename) - 128; // 128 = ID3v1_TAG_SIZE
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}
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// APE tag found, no ID3v1
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elseif (substr($apetag_footer_id3v1, strlen($apetag_footer_id3v1) - 32, 8) == 'APETAGEX') { // 32 = APETAG_HEADER_SIZE
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$getid3->info['ape']['tag_offset_end'] = filesize($getid3->filename);
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}
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}
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else {
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fseek($getid3->fp, $this->option_override_end_offset - 32, SEEK_SET); // 32 = APETAG_HEADER_SIZE
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if (fread($getid3->fp, 8) == 'APETAGEX') {
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$getid3->info['ape']['tag_offset_end'] = $this->option_override_end_offset;
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}
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}
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// APE tag not found
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if (!@$getid3->info['ape']['tag_offset_end']) {
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return false;
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}
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// Shortcut
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$info_ape = &$getid3->info['ape'];
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// Read and parse footer
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fseek($getid3->fp, $info_ape['tag_offset_end'] - 32, SEEK_SET); // 32 = APETAG_HEADER_SIZE
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$apetag_footer_data = fread($getid3->fp, 32);
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if (!($this->ParseAPEHeaderFooter($apetag_footer_data, $info_ape['footer']))) {
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throw new getid3_exception('Error parsing APE footer at offset '.$info_ape['tag_offset_end']);
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}
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if (isset($info_ape['footer']['flags']['header']) && $info_ape['footer']['flags']['header']) {
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fseek($getid3->fp, $info_ape['tag_offset_end'] - $info_ape['footer']['raw']['tagsize'] - 32, SEEK_SET);
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$info_ape['tag_offset_start'] = ftell($getid3->fp);
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$apetag_data = fread($getid3->fp, $info_ape['footer']['raw']['tagsize'] + 32);
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}
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else {
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$info_ape['tag_offset_start'] = $info_ape['tag_offset_end'] - $info_ape['footer']['raw']['tagsize'];
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fseek($getid3->fp, $info_ape['tag_offset_start'], SEEK_SET);
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$apetag_data = fread($getid3->fp, $info_ape['footer']['raw']['tagsize']);
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}
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$getid3->info['avdataend'] = $info_ape['tag_offset_start'];
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if (isset($getid3->info['id3v1']['tag_offset_start']) && ($getid3->info['id3v1']['tag_offset_start'] < $info_ape['tag_offset_end'])) {
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$getid3->warning('ID3v1 tag information ignored since it appears to be a false synch in APEtag data');
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unset($getid3->info['id3v1']);
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}
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$offset = 0;
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if (isset($info_ape['footer']['flags']['header']) && $info_ape['footer']['flags']['header']) {
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if (!$this->ParseAPEHeaderFooter(substr($apetag_data, 0, 32), $info_ape['header'])) {
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throw new getid3_exception('Error parsing APE header at offset '.$info_ape['tag_offset_start']);
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}
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$offset = 32;
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}
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// Shortcut
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$getid3->info['replay_gain'] = array ();
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$info_replaygain = &$getid3->info['replay_gain'];
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for ($i = 0; $i < $info_ape['footer']['raw']['tag_items']; $i++) {
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$value_size = getid3_lib::LittleEndian2Int(substr($apetag_data, $offset, 4));
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$item_flags = getid3_lib::LittleEndian2Int(substr($apetag_data, $offset + 4, 4));
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$offset += 8;
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if (strstr(substr($apetag_data, $offset), "\x00") === false) {
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throw new getid3_exception('Cannot find null-byte (0x00) seperator between ItemKey #'.$i.' and value. ItemKey starts ' . $offset . ' bytes into the APE tag, at file offset '.($info_ape['tag_offset_start'] + $offset));
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}
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$item_key_length = strpos($apetag_data, "\x00", $offset) - $offset;
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$item_key = strtolower(substr($apetag_data, $offset, $item_key_length));
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// Shortcut
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$info_ape['items'][$item_key] = array ();
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$info_ape_items_current = &$info_ape['items'][$item_key];
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$offset += $item_key_length + 1; // skip 0x00 terminator
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$info_ape_items_current['data'] = substr($apetag_data, $offset, $value_size);
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$offset += $value_size;
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$info_ape_items_current['flags'] = $this->ParseAPEtagFlags($item_flags);
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switch ($info_ape_items_current['flags']['item_contents_raw']) {
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case 0: // UTF-8
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case 3: // Locator (URL, filename, etc), UTF-8 encoded
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$info_ape_items_current['data'] = explode("\x00", trim($info_ape_items_current['data']));
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break;
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default: // binary data
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break;
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}
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switch (strtolower($item_key)) {
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case 'replaygain_track_gain':
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$info_replaygain['track']['adjustment'] = (float)str_replace(',', '.', $info_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
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$info_replaygain['track']['originator'] = 'unspecified';
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break;
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case 'replaygain_track_peak':
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$info_replaygain['track']['peak'] = (float)str_replace(',', '.', $info_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
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$info_replaygain['track']['originator'] = 'unspecified';
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if ($info_replaygain['track']['peak'] <= 0) {
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$getid3->warning('ReplayGain Track peak from APEtag appears invalid: '.$info_replaygain['track']['peak'].' (original value = "'.$info_ape_items_current['data'][0].'")');
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}
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break;
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case 'replaygain_album_gain':
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$info_replaygain['album']['adjustment'] = (float)str_replace(',', '.', $info_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
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$info_replaygain['album']['originator'] = 'unspecified';
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break;
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case 'replaygain_album_peak':
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$info_replaygain['album']['peak'] = (float)str_replace(',', '.', $info_ape_items_current['data'][0]); // float casting will see "0,95" as zero!
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$info_replaygain['album']['originator'] = 'unspecified';
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if ($info_replaygain['album']['peak'] <= 0) {
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$getid3->warning('ReplayGain Album peak from APEtag appears invalid: '.$info_replaygain['album']['peak'].' (original value = "'.$info_ape_items_current['data'][0].'")');
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}
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break;
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case 'mp3gain_undo':
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list($mp3gain_undo_left, $mp3gain_undo_right, $mp3gain_undo_wrap) = explode(',', $info_ape_items_current['data'][0]);
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$info_replaygain['mp3gain']['undo_left'] = intval($mp3gain_undo_left);
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$info_replaygain['mp3gain']['undo_right'] = intval($mp3gain_undo_right);
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$info_replaygain['mp3gain']['undo_wrap'] = (($mp3gain_undo_wrap == 'Y') ? true : false);
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break;
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case 'mp3gain_minmax':
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list($mp3gain_globalgain_min, $mp3gain_globalgain_max) = explode(',', $info_ape_items_current['data'][0]);
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$info_replaygain['mp3gain']['globalgain_track_min'] = intval($mp3gain_globalgain_min);
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$info_replaygain['mp3gain']['globalgain_track_max'] = intval($mp3gain_globalgain_max);
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break;
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case 'mp3gain_album_minmax':
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list($mp3gain_globalgain_album_min, $mp3gain_globalgain_album_max) = explode(',', $info_ape_items_current['data'][0]);
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$info_replaygain['mp3gain']['globalgain_album_min'] = intval($mp3gain_globalgain_album_min);
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$info_replaygain['mp3gain']['globalgain_album_max'] = intval($mp3gain_globalgain_album_max);
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break;
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case 'tracknumber':
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foreach ($info_ape_items_current['data'] as $comment) {
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$info_ape['comments']['track'][] = $comment;
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}
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break;
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default:
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foreach ($info_ape_items_current['data'] as $comment) {
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$info_ape['comments'][strtolower($item_key)][] = $comment;
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}
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break;
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}
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}
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if (empty($info_replaygain)) {
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unset($getid3->info['replay_gain']);
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}
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return true;
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}
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protected function ParseAPEheaderFooter($data, &$target) {
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// http://www.uni-jena.de/~pfk/mpp/sv8/apeheader.html
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if (substr($data, 0, 8) != 'APETAGEX') {
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return false;
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}
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// shortcut
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$target['raw'] = array ();
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$target_raw = &$target['raw'];
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$target_raw['footer_tag'] = 'APETAGEX';
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getid3_lib::ReadSequence("LittleEndian2Int", $target_raw, $data, 8,
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array (
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'version' => 4,
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'tagsize' => 4,
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'tag_items' => 4,
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'global_flags' => 4
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)
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);
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$target_raw['reserved'] = substr($data, 24, 8);
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$target['tag_version'] = $target_raw['version'] / 1000;
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if ($target['tag_version'] >= 2) {
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$target['flags'] = $this->ParseAPEtagFlags($target_raw['global_flags']);
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}
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return true;
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}
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protected function ParseAPEtagFlags($raw_flag_int) {
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// "Note: APE Tags 1.0 do not use any of the APE Tag flags.
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// All are set to zero on creation and ignored on reading."
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// http://www.uni-jena.de/~pfk/mpp/sv8/apetagflags.html
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$target['header'] = (bool) ($raw_flag_int & 0x80000000);
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$target['footer'] = (bool) ($raw_flag_int & 0x40000000);
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$target['this_is_header'] = (bool) ($raw_flag_int & 0x20000000);
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$target['item_contents_raw'] = ($raw_flag_int & 0x00000006) >> 1;
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$target['read_only'] = (bool) ($raw_flag_int & 0x00000001);
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$target['item_contents'] = getid3_apetag::APEcontentTypeFlagLookup($target['item_contents_raw']);
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return $target;
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}
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public static function APEcontentTypeFlagLookup($content_type_id) {
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static $lookup = array (
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0 => 'utf-8',
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1 => 'binary',
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2 => 'external',
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3 => 'reserved'
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);
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return (isset($lookup[$content_type_id]) ? $lookup[$content_type_id] : 'invalid');
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}
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public static function APEtagItemIsUTF8Lookup($item_key) {
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static $lookup = array (
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'title',
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'subtitle',
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'artist',
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'album',
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'debut album',
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'publisher',
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'conductor',
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'track',
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'composer',
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'comment',
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'copyright',
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'publicationright',
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'file',
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'year',
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'record date',
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'record location',
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'genre',
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'media',
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'related',
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'isrc',
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'abstract',
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'language',
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'bibliography'
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);
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return in_array(strtolower($item_key), $lookup);
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}
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}
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?>
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