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source: extensions/charlies_content/getid3/getid3/module.audio.bonk.php @ 3318

Last change on this file since 3318 was 3318, checked in by vdigital, 15 years ago
+ Add Charlies' content to depository
Property svn:keywords set to `Author Date Id Revision`
File size: 10.5 KB

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1	<?php
2	// +----------------------------------------------------------------------+
3	// \| PHP version 5 \|
4	// +----------------------------------------------------------------------+
5	// \| Copyright (c) 2002-2006 James Heinrich, Allan Hansen \|
6	// +----------------------------------------------------------------------+
7	// \| This source file is subject to version 2 of the GPL license, \|
8	// \| that is bundled with this package in the file license.txt and is \|
9	// \| available through the world-wide-web at the following url: \|
10	// \| http://www.gnu.org/copyleft/gpl.html \|
11	// +----------------------------------------------------------------------+
12	// \| getID3() - http://getid3.sourceforge.net or http://www.getid3.org \|
13	// +----------------------------------------------------------------------+
14	// \| Authors: James Heinrich <infoØgetid3*org> \|
15	// \| Allan Hansen <ahØartemis*dk> \|
16	// +----------------------------------------------------------------------+
17	// \| module.audio.bonk.php \|
18	// \| Module for analyzing BONK audio files \|
19	// \| dependencies: module.tag.id3v2.php (optional) \|
20	// +----------------------------------------------------------------------+
21	//
22	// $Id: module.audio.bonk.php 3318 2009-05-20 21:54:10Z vdigital $
23
24
25
26	class getid3_bonk extends getid3_handler
27	{
28
29	public function Analyze() {
30
31	$getid3 = $this->getid3;
32
33	$getid3->info['bonk'] = array ();
34	$info_bonk = &$getid3->info['bonk'];
35
36	$info_bonk['dataoffset'] = $getid3->info['avdataoffset'];
37	$info_bonk['dataend'] = $getid3->info['avdataend'];
38
39
40	// Scan-from-end method, for v0.6 and higher
41	fseek($getid3->fp, $info_bonk['dataend'] - 8, SEEK_SET);
42	$possible_bonk_tag = fread($getid3->fp, 8);
43	while (getid3_bonk::BonkIsValidTagName(substr($possible_bonk_tag, 4, 4), true)) {
44	$bonk_tag_size = getid3_lib::LittleEndian2Int(substr($possible_bonk_tag, 0, 4));
45	fseek($getid3->fp, 0 - $bonk_tag_size, SEEK_CUR);
46	$bonk_tag_offset = ftell($getid3->fp);
47	$tag_header_test = fread($getid3->fp, 5);
48	if (($tag_header_test{0} != "\x00") \|\| (substr($possible_bonk_tag, 4, 4) != strtolower(substr($possible_bonk_tag, 4, 4)))) {
49	throw new getid3_exception('Expecting "Ø'.strtoupper(substr($possible_bonk_tag, 4, 4)).'" at offset '.$bonk_tag_offset.', found "'.$tag_header_test.'"');
50	}
51	$bonk_tag_name = substr($tag_header_test, 1, 4);
52
53	$info_bonk[$bonk_tag_name]['size'] = $bonk_tag_size;
54	$info_bonk[$bonk_tag_name]['offset'] = $bonk_tag_offset;
55	$this->HandleBonkTags($bonk_tag_name);
56
57	$next_tag_end_offset = $bonk_tag_offset - 8;
58	if ($next_tag_end_offset < $info_bonk['dataoffset']) {
59	if (empty($getid3->info['audio']['encoder'])) {
60	$getid3->info['audio']['encoder'] = 'Extended BONK v0.9+';
61	}
62	return true;
63	}
64	fseek($getid3->fp, $next_tag_end_offset, SEEK_SET);
65	$possible_bonk_tag = fread($getid3->fp, 8);
66	}
67
68	// Seek-from-beginning method for v0.4 and v0.5
69	if (empty($info_bonk['BONK'])) {
70	fseek($getid3->fp, $info_bonk['dataoffset'], SEEK_SET);
71	do {
72	$tag_header_test = fread($getid3->fp, 5);
73	switch ($tag_header_test) {
74	case "\x00".'BONK':
75	if (empty($getid3->info['audio']['encoder'])) {
76	$getid3->info['audio']['encoder'] = 'BONK v0.4';
77	}
78	break;
79
80	case "\x00".'INFO':
81	$getid3->info['audio']['encoder'] = 'Extended BONK v0.5';
82	break;
83
84	default:
85	break 2;
86	}
87	$bonk_tag_name = substr($tag_header_test, 1, 4);
88	$info_bonk[$bonk_tag_name]['size'] = $info_bonk['dataend'] - $info_bonk['dataoffset'];
89	$info_bonk[$bonk_tag_name]['offset'] = $info_bonk['dataoffset'];
90	$this->HandleBonkTags($bonk_tag_name);
91
92	} while (true);
93	}
94
95
96	// Parse META block for v0.6 - v0.8
97	if (!@$info_bonk['INFO'] && isset($info_bonk['META']['tags']['info'])) {
98	fseek($getid3->fp, $info_bonk['META']['tags']['info'], SEEK_SET);
99	$tag_header_test = fread($getid3->fp, 5);
100	if ($tag_header_test == "\x00".'INFO') {
101	$getid3->info['audio']['encoder'] = 'Extended BONK v0.6 - v0.8';
102
103	$bonk_tag_name = substr($tag_header_test, 1, 4);
104	$info_bonk[$bonk_tag_name]['size'] = $info_bonk['dataend'] - $info_bonk['dataoffset'];
105	$info_bonk[$bonk_tag_name]['offset'] = $info_bonk['dataoffset'];
106	$this->HandleBonkTags($bonk_tag_name);
107	}
108	}
109
110	if (empty($getid3->info['audio']['encoder'])) {
111	$getid3->info['audio']['encoder'] = 'Extended BONK v0.9+';
112	}
113	if (empty($info_bonk['BONK'])) {
114	unset($getid3->info['bonk']);
115	}
116	return true;
117
118	}
119
120
121
122	private function HandleBonkTags(&$bonk_tag_name) {
123
124	// Shortcut to getid3 pointer
125	$getid3 = $this->getid3;
126	$info_audio = &$getid3->info['audio'];
127
128	switch ($bonk_tag_name) {
129
130	case 'BONK':
131	// shortcut
132	$info_bonk_BONK = &$getid3->info['bonk']['BONK'];
133
134	$bonk_data = "\x00".'BONK'.fread($getid3->fp, 17);
135
136	getid3_lib::ReadSequence('LittleEndian2Int', $info_bonk_BONK, $bonk_data, 5,
137	array (
138	'version' => 1,
139	'number_samples' => 4,
140	'sample_rate' => 4,
141	'channels' => 1,
142	'lossless' => 1,
143	'joint_stereo' => 1,
144	'number_taps' => 2,
145	'downsampling_ratio' => 1,
146	'samples_per_packet' => 2
147	)
148	);
149
150	$info_bonk_BONK['lossless'] = (bool)$info_bonk_BONK['lossless'];
151	$info_bonk_BONK['joint_stereo'] = (bool)$info_bonk_BONK['joint_stereo'];
152
153	$getid3->info['avdataoffset'] = $info_bonk_BONK['offset'] + 5 + 17;
154	$getid3->info['avdataend'] = $info_bonk_BONK['offset'] + $info_bonk_BONK['size'];
155
156	$getid3->info['fileformat'] = 'bonk';
157	$info_audio['dataformat'] = 'bonk';
158	$info_audio['bitrate_mode'] = 'vbr'; // assumed
159	$info_audio['channels'] = $info_bonk_BONK['channels'];
160	$info_audio['sample_rate'] = $info_bonk_BONK['sample_rate'];
161	$info_audio['channelmode'] = $info_bonk_BONK['joint_stereo'] ? 'joint stereo' : 'stereo';
162	$info_audio['lossless'] = $info_bonk_BONK['lossless'];
163	$info_audio['codec'] = 'bonk';
164
165	$getid3->info['playtime_seconds'] = $info_bonk_BONK['number_samples'] / ($info_bonk_BONK['sample_rate'] * $info_bonk_BONK['channels']);
166	if ($getid3->info['playtime_seconds'] > 0) {
167	$info_audio['bitrate'] = (($getid3->info['bonk']['dataend'] - $getid3->info['bonk']['dataoffset']) * 8) / $getid3->info['playtime_seconds'];
168	}
169	break;
170
171	case 'INFO':
172	// shortcut
173	$info_bonk_INFO = &$getid3->info['bonk']['INFO'];
174
175	$info_bonk_INFO['version'] = getid3_lib::LittleEndian2Int(fread($getid3->fp, 1));
176	$info_bonk_INFO['entries_count'] = 0;
177	$next_info_data_pair = fread($getid3->fp, 5);
178	if (!getid3_bonk::BonkIsValidTagName(substr($next_info_data_pair, 1, 4))) {
179	while (!feof($getid3->fp)) {
180	$next_info_data_pair = fread($getid3->fp, 5);
181	if (getid3_bonk::BonkIsValidTagName(substr($next_info_data_pair, 1, 4))) {
182	fseek($getid3->fp, -5, SEEK_CUR);
183	break;
184	}
185	$info_bonk_INFO['entries_count']++;
186	}
187	}
188	break;
189
190	case 'META':
191	$bonk_data = "\x00".'META'.fread($getid3->fp, $getid3->info['bonk']['META']['size'] - 5);
192	$getid3->info['bonk']['META']['version'] = getid3_lib::LittleEndian2Int(substr($bonk_data, 5, 1));
193
194	$meta_tag_entries = floor(((strlen($bonk_data) - 8) - 6) / 8); // BonkData - xxxxmeta - ØMETA
195	$offset = 6;
196	for ($i = 0; $i < $meta_tag_entries; $i++) {
197	$meta_entry_tag_name = substr($bonk_data, $offset, 4);
198	$offset += 4;
199	$meta_entry_tag_offset = getid3_lib::LittleEndian2Int(substr($bonk_data, $offset, 4));
200	$offset += 4;
201	$getid3->info['bonk']['META']['tags'][$meta_entry_tag_name] = $meta_entry_tag_offset;
202	}
203	break;
204
205	case ' ID3':
206	$info_audio['encoder'] = 'Extended BONK v0.9+';
207
208	// ID3v2 checking is optional
209	if (class_exists('getid3_id3v2')) {
210
211	$id3v2 = new getid3_id3v2($getid3);
212	$id3v2->option_starting_offset = $getid3->info['bonk'][' ID3']['offset'] + 2;
213	$getid3->info['bonk'][' ID3']['valid'] = $id3v2->Analyze();
214	}
215	break;
216
217	default:
218	$getid3->warning('Unexpected Bonk tag "'.$bonk_tag_name.'" at offset '.$getid3->info['bonk'][$bonk_tag_name]['offset']);
219	break;
220
221	}
222	}
223
224
225
226	public static function BonkIsValidTagName($possible_bonk_tag, $ignore_case=false) {
227
228	$ignore_case = $ignore_case ? 'i' : '';
229	return preg_match('/^(BONK\|INFO\| ID3\|META)$/'.$ignore_case, $possible_bonk_tag);
230	}
231
232	}
233
234
235	?>

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