mirror of
https://github.com/Yetangitu/ampache
synced 2025-10-05 19:41:55 +02:00
235 lines
No EOL
11 KiB
PHP
235 lines
No EOL
11 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.audio.bonk.php |
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// | Module for analyzing BONK audio files |
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// | dependencies: module.tag.id3v2.php (optional) |
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// +----------------------------------------------------------------------+
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//
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// $Id: module.audio.bonk.php,v 1.3 2006/11/02 10:48:01 ah Exp $
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class getid3_bonk extends getid3_handler
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{
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public function Analyze() {
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$getid3 = $this->getid3;
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$getid3->info['bonk'] = array ();
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$info_bonk = &$getid3->info['bonk'];
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$info_bonk['dataoffset'] = $getid3->info['avdataoffset'];
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$info_bonk['dataend'] = $getid3->info['avdataend'];
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// Scan-from-end method, for v0.6 and higher
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fseek($getid3->fp, $info_bonk['dataend'] - 8, SEEK_SET);
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$possible_bonk_tag = fread($getid3->fp, 8);
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while (getid3_bonk::BonkIsValidTagName(substr($possible_bonk_tag, 4, 4), true)) {
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$bonk_tag_size = getid3_lib::LittleEndian2Int(substr($possible_bonk_tag, 0, 4));
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fseek($getid3->fp, 0 - $bonk_tag_size, SEEK_CUR);
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$bonk_tag_offset = ftell($getid3->fp);
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$tag_header_test = fread($getid3->fp, 5);
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if (($tag_header_test{0} != "\x00") || (substr($possible_bonk_tag, 4, 4) != strtolower(substr($possible_bonk_tag, 4, 4)))) {
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throw new getid3_exception('Expecting "Ø'.strtoupper(substr($possible_bonk_tag, 4, 4)).'" at offset '.$bonk_tag_offset.', found "'.$tag_header_test.'"');
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}
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$bonk_tag_name = substr($tag_header_test, 1, 4);
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$info_bonk[$bonk_tag_name]['size'] = $bonk_tag_size;
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$info_bonk[$bonk_tag_name]['offset'] = $bonk_tag_offset;
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$this->HandleBonkTags($bonk_tag_name);
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$next_tag_end_offset = $bonk_tag_offset - 8;
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if ($next_tag_end_offset < $info_bonk['dataoffset']) {
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if (empty($getid3->info['audio']['encoder'])) {
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$getid3->info['audio']['encoder'] = 'Extended BONK v0.9+';
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}
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return true;
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}
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fseek($getid3->fp, $next_tag_end_offset, SEEK_SET);
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$possible_bonk_tag = fread($getid3->fp, 8);
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}
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// Seek-from-beginning method for v0.4 and v0.5
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if (empty($info_bonk['BONK'])) {
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fseek($getid3->fp, $info_bonk['dataoffset'], SEEK_SET);
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do {
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$tag_header_test = fread($getid3->fp, 5);
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switch ($tag_header_test) {
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case "\x00".'BONK':
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if (empty($getid3->info['audio']['encoder'])) {
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$getid3->info['audio']['encoder'] = 'BONK v0.4';
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}
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break;
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case "\x00".'INFO':
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$getid3->info['audio']['encoder'] = 'Extended BONK v0.5';
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break;
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default:
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break 2;
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}
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$bonk_tag_name = substr($tag_header_test, 1, 4);
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$info_bonk[$bonk_tag_name]['size'] = $info_bonk['dataend'] - $info_bonk['dataoffset'];
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$info_bonk[$bonk_tag_name]['offset'] = $info_bonk['dataoffset'];
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$this->HandleBonkTags($bonk_tag_name);
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} while (true);
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}
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// Parse META block for v0.6 - v0.8
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if (!@$info_bonk['INFO'] && isset($info_bonk['META']['tags']['info'])) {
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fseek($getid3->fp, $info_bonk['META']['tags']['info'], SEEK_SET);
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$tag_header_test = fread($getid3->fp, 5);
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if ($tag_header_test == "\x00".'INFO') {
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$getid3->info['audio']['encoder'] = 'Extended BONK v0.6 - v0.8';
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$bonk_tag_name = substr($tag_header_test, 1, 4);
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$info_bonk[$bonk_tag_name]['size'] = $info_bonk['dataend'] - $info_bonk['dataoffset'];
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$info_bonk[$bonk_tag_name]['offset'] = $info_bonk['dataoffset'];
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$this->HandleBonkTags($bonk_tag_name);
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}
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}
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if (empty($getid3->info['audio']['encoder'])) {
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$getid3->info['audio']['encoder'] = 'Extended BONK v0.9+';
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}
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if (empty($info_bonk['BONK'])) {
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unset($getid3->info['bonk']);
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}
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return true;
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}
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private function HandleBonkTags(&$bonk_tag_name) {
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// Shortcut to getid3 pointer
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$getid3 = $this->getid3;
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$info_audio = &$getid3->info['audio'];
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switch ($bonk_tag_name) {
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case 'BONK':
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// shortcut
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$info_bonk_BONK = &$getid3->info['bonk']['BONK'];
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$bonk_data = "\x00".'BONK'.fread($getid3->fp, 17);
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getid3_lib::ReadSequence('LittleEndian2Int', $info_bonk_BONK, $bonk_data, 5,
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array (
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'version' => 1,
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'number_samples' => 4,
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'sample_rate' => 4,
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'channels' => 1,
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'lossless' => 1,
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'joint_stereo' => 1,
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'number_taps' => 2,
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'downsampling_ratio' => 1,
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'samples_per_packet' => 2
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)
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);
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$info_bonk_BONK['lossless'] = (bool)$info_bonk_BONK['lossless'];
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$info_bonk_BONK['joint_stereo'] = (bool)$info_bonk_BONK['joint_stereo'];
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$getid3->info['avdataoffset'] = $info_bonk_BONK['offset'] + 5 + 17;
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$getid3->info['avdataend'] = $info_bonk_BONK['offset'] + $info_bonk_BONK['size'];
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$getid3->info['fileformat'] = 'bonk';
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$info_audio['dataformat'] = 'bonk';
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$info_audio['bitrate_mode'] = 'vbr'; // assumed
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$info_audio['channels'] = $info_bonk_BONK['channels'];
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$info_audio['sample_rate'] = $info_bonk_BONK['sample_rate'];
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$info_audio['channelmode'] = $info_bonk_BONK['joint_stereo'] ? 'joint stereo' : 'stereo';
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$info_audio['lossless'] = $info_bonk_BONK['lossless'];
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$info_audio['codec'] = 'bonk';
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$getid3->info['playtime_seconds'] = $info_bonk_BONK['number_samples'] / ($info_bonk_BONK['sample_rate'] * $info_bonk_BONK['channels']);
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if ($getid3->info['playtime_seconds'] > 0) {
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$info_audio['bitrate'] = (($getid3->info['bonk']['dataend'] - $getid3->info['bonk']['dataoffset']) * 8) / $getid3->info['playtime_seconds'];
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}
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break;
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case 'INFO':
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// shortcut
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$info_bonk_INFO = &$getid3->info['bonk']['INFO'];
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$info_bonk_INFO['version'] = getid3_lib::LittleEndian2Int(fread($getid3->fp, 1));
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$info_bonk_INFO['entries_count'] = 0;
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$next_info_data_pair = fread($getid3->fp, 5);
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if (!getid3_bonk::BonkIsValidTagName(substr($next_info_data_pair, 1, 4))) {
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while (!feof($getid3->fp)) {
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$next_info_data_pair = fread($getid3->fp, 5);
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if (getid3_bonk::BonkIsValidTagName(substr($next_info_data_pair, 1, 4))) {
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fseek($getid3->fp, -5, SEEK_CUR);
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break;
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}
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$info_bonk_INFO['entries_count']++;
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}
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}
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break;
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case 'META':
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$bonk_data = "\x00".'META'.fread($getid3->fp, $getid3->info['bonk']['META']['size'] - 5);
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$getid3->info['bonk']['META']['version'] = getid3_lib::LittleEndian2Int(substr($bonk_data, 5, 1));
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$meta_tag_entries = floor(((strlen($bonk_data) - 8) - 6) / 8); // BonkData - xxxxmeta - ØMETA
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$offset = 6;
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for ($i = 0; $i < $meta_tag_entries; $i++) {
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$meta_entry_tag_name = substr($bonk_data, $offset, 4);
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$offset += 4;
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$meta_entry_tag_offset = getid3_lib::LittleEndian2Int(substr($bonk_data, $offset, 4));
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$offset += 4;
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$getid3->info['bonk']['META']['tags'][$meta_entry_tag_name] = $meta_entry_tag_offset;
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}
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break;
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case ' ID3':
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$info_audio['encoder'] = 'Extended BONK v0.9+';
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// ID3v2 checking is optional
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if (class_exists('getid3_id3v2')) {
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$id3v2 = new getid3_id3v2($getid3);
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$id3v2->option_starting_offset = $getid3->info['bonk'][' ID3']['offset'] + 2;
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$getid3->info['bonk'][' ID3']['valid'] = $id3v2->Analyze();
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}
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break;
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default:
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$getid3->warning('Unexpected Bonk tag "'.$bonk_tag_name.'" at offset '.$getid3->info['bonk'][$bonk_tag_name]['offset']);
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break;
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}
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}
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public static function BonkIsValidTagName($possible_bonk_tag, $ignore_case=false) {
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$ignore_case = $ignore_case ? 'i' : '';
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return preg_match('/^(BONK|INFO| ID3|META)$/'.$ignore_case, $possible_bonk_tag);
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}
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}
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?>
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