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source: extensions/charlies_content/getid3/getid3/module.audio.mp3.php @ 3318

Last change on this file since 3318 was 3318, checked in by vdigital, 15 years ago
+ Add Charlies' content to depository
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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.mp3.php \|
18	// \| Module for analyzing MPEG Audio Layer 1,2,3 files. \|
19	// \| dependencies: none \|
20	// +----------------------------------------------------------------------+
21	//
22	// $Id: module.audio.mp3.php 3318 2009-05-20 21:54:10Z vdigital $
23
24
25
26	class getid3_mp3 extends getid3_handler
27	{
28	// Number of frames to scan to determine if MPEG-audio sequence is valid.
29	// Lower this number to 5-20 for faster scanning
30	// Increase this number to 50+ for most accurate detection of valid VBR/CBR mpeg-audio streams
31	const VALID_CHECK_FRAMES = 35;
32
33
34	public function Analyze() {
35
36	$this->getAllMPEGInfo($this->getid3->fp, $this->getid3->info);
37
38	return true;
39	}
40
41
42	public function AnalyzeMPEGaudioInfo() {
43
44	$this->getOnlyMPEGaudioInfo($this->getid3->fp, $this->getid3->info, $this->getid3->info['avdataoffset'], false);
45	}
46
47
48	public function getAllMPEGInfo(&$fd, &$info) {
49
50	$this->getOnlyMPEGaudioInfo($fd, $info, 0 + $info['avdataoffset']);
51
52	if (isset($info['mpeg']['audio']['bitrate_mode'])) {
53	$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
54	}
55
56	if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) \|\| (!isset($info['id3v2']) && ($info['avdataoffset'] > 0)))) {
57
58	$synch_offset_warning = 'Unknown data before synch ';
59	if (isset($info['id3v2']['headerlength'])) {
60	$synch_offset_warning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
61	} else {
62	$synch_offset_warning .= '(should be at beginning of file, ';
63	}
64	$synch_offset_warning .= 'synch detected at '.$info['avdataoffset'].')';
65	if ($info['audio']['bitrate_mode'] == 'cbr') {
66
67	if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
68
69	$synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
70	$info['audio']['codec'] = 'LAME';
71	$current_data_lame_version_string = 'LAME3.';
72
73	} elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
74
75	$synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
76	$info['audio']['codec'] = 'LAME';
77	$current_data_lame_version_string = 'LAME3.';
78
79	}
80
81	}
82	$this->getid3->warning($synch_offset_warning);
83
84	}
85
86	if (isset($info['mpeg']['audio']['LAME'])) {
87	$info['audio']['codec'] = 'LAME';
88	if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
89	$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
90	} elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
91	$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
92	}
93	}
94
95	$current_data_lame_version_string = (!empty($current_data_lame_version_string) ? $current_data_lame_version_string : @$info['audio']['encoder']);
96	if (!empty($current_data_lame_version_string) && (substr($current_data_lame_version_string, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($current_data_lame_version_string, -1))) {
97	// a version number of LAME that does not end with a number like "LAME3.92"
98	// or with a closing parenthesis like "LAME3.88 (alpha)"
99	// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
100
101	// not sure what the actual last frame length will be, but will be less than or equal to 1441
102	$possibly_longer_lame_version_frame_length = 1441;
103
104	// Not sure what version of LAME this is - look in padding of last frame for longer version string
105	$possible_lame_version_string_offset = $info['avdataend'] - $possibly_longer_lame_version_frame_length;
106	fseek($fd, $possible_lame_version_string_offset);
107	$possibly_longer_lame_version_data = fread($fd, $possibly_longer_lame_version_frame_length);
108	switch (substr($current_data_lame_version_string, -1)) {
109	case 'a':
110	case 'b':
111	// "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
112	// need to trim off "a" to match longer string
113	$current_data_lame_version_string = substr($current_data_lame_version_string, 0, -1);
114	break;
115	}
116	if (($possibly_longer_lame_version_string = strstr($possibly_longer_lame_version_data, $current_data_lame_version_string)) !== false) {
117	if (substr($possibly_longer_lame_version_string, 0, strlen($current_data_lame_version_string)) == $current_data_lame_version_string) {
118	$possibly_longer_lame_version_new_string = substr($possibly_longer_lame_version_string, 0, strspn($possibly_longer_lame_version_string, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
119	if (strlen($possibly_longer_lame_version_new_string) > strlen(@$info['audio']['encoder'])) {
120	$info['audio']['encoder'] = $possibly_longer_lame_version_new_string;
121	}
122	}
123	}
124	}
125	if (!empty($info['audio']['encoder'])) {
126	$info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
127	}
128
129	switch (@$info['mpeg']['audio']['layer']) {
130	case 1:
131	case 2:
132	$info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
133	break;
134	}
135	if (@$info['fileformat'] == 'mp3') {
136	switch ($info['audio']['dataformat']) {
137	case 'mp1':
138	case 'mp2':
139	case 'mp3':
140	$info['fileformat'] = $info['audio']['dataformat'];
141	break;
142
143	default:
144	$this->getid3->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"');
145	break;
146	}
147	}
148
149	$info['mime_type'] = 'audio/mpeg';
150	$info['audio']['lossless'] = false;
151
152	// Calculate playtime
153	if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
154	$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];
155	}
156
157	$info['audio']['encoder_options'] = getid3_mp3::GuessEncoderOptions($info);
158
159	return true;
160	}
161
162
163
164	public static function GuessEncoderOptions(&$info) {
165	// shortcuts
166	if (!empty($info['mpeg']['audio'])) {
167	$thisfile_mpeg_audio = &$info['mpeg']['audio'];
168	if (!empty($thisfile_mpeg_audio['LAME'])) {
169	$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
170	}
171	}
172
173	$encoder_options = '';
174	static $named_preset_bitrates = array (16, 24, 40, 56, 112, 128, 160, 192, 256);
175
176	if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
177
178	$encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
179
180	} elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $named_preset_bitrates))) {
181
182	$encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
183
184	} elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
185
186	static $known_encoder_values = array ();
187	if (empty($known_encoder_values)) {
188
189	//$known_encoder_values[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
190	$known_encoder_values[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
191	$known_encoder_values[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
192	$known_encoder_values[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
193	$known_encoder_values['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
194	$known_encoder_values['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
195	$known_encoder_values['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
196	$known_encoder_values['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
197	$known_encoder_values['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
198	$known_encoder_values['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
199	$known_encoder_values['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
200	$known_encoder_values['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
201	$known_encoder_values['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
202	$known_encoder_values['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
203	$known_encoder_values['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
204	$known_encoder_values['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
205	$known_encoder_values['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
206	$known_encoder_values['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
207
208	$known_encoder_values[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
209	$known_encoder_values[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
210	$known_encoder_values[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
211	$known_encoder_values[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
212	$known_encoder_values[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
213	$known_encoder_values[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
214	$known_encoder_values[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
215	$known_encoder_values[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
216	$known_encoder_values[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
217	$known_encoder_values[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
218	$known_encoder_values[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
219	$known_encoder_values[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
220	$known_encoder_values[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
221	$known_encoder_values[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
222	$known_encoder_values[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
223	$known_encoder_values[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
224	$known_encoder_values[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
225	$known_encoder_values[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
226	$known_encoder_values[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
227	$known_encoder_values[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
228	$known_encoder_values[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
229	$known_encoder_values[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
230	$known_encoder_values[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
231	$known_encoder_values[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
232	$known_encoder_values[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
233	$known_encoder_values[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
234	$known_encoder_values[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
235	$known_encoder_values[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
236	$known_encoder_values[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
237	$known_encoder_values[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
238	$known_encoder_values[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
239	$known_encoder_values[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
240	$known_encoder_values[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
241	}
242
243	if (isset($known_encoder_values[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {
244
245	$encoder_options = $known_encoder_values[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
246
247	} elseif (isset($known_encoder_values['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {
248
249	$encoder_options = $known_encoder_values['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
250
251	} elseif ($info['audio']['bitrate_mode'] == 'vbr') {
252
253	// http://gabriel.mp3-tech.org/mp3infotag.html
254	// int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
255
256
257	$lame_v_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
258	$lame_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($lame_v_value * 10);
259	$encoder_options = '-V'.$lame_v_value.' -q'.$lame_q_value;
260
261	} elseif ($info['audio']['bitrate_mode'] == 'cbr') {
262
263	$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
264
265	} else {
266
267	$encoder_options = strtoupper($info['audio']['bitrate_mode']);
268
269	}
270
271	} elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
272
273	$encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
274
275	} elseif (!empty($info['audio']['bitrate'])) {
276
277	if ($info['audio']['bitrate_mode'] == 'cbr') {
278	$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
279	} else {
280	$encoder_options = strtoupper($info['audio']['bitrate_mode']);
281	}
282
283	}
284	if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
285	$encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
286	}
287
288	if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] \|\| @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) {
289	$encoder_options .= ' --nogap';
290	}
291
292	if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
293	$exploded_options = explode(' ', $encoder_options, 4);
294	if ($exploded_options[0] == '--r3mix') {
295	$exploded_options[1] = 'r3mix';
296	}
297	switch ($exploded_options[0]) {
298	case '--preset':
299	case '--alt-preset':
300	case '--r3mix':
301	if ($exploded_options[1] == 'fast') {
302	$exploded_options[1] .= ' '.$exploded_options[2];
303	}
304	switch ($exploded_options[1]) {
305	case 'portable':
306	case 'medium':
307	case 'standard':
308	case 'extreme':
309	case 'insane':
310	case 'fast portable':
311	case 'fast medium':
312	case 'fast standard':
313	case 'fast extreme':
314	case 'fast insane':
315	case 'r3mix':
316	static $expected_lowpass = array (
317	'insane\|20500' => 20500,
318	'insane\|20600' => 20600, // 3.90.2, 3.90.3, 3.91
319	'medium\|18000' => 18000,
320	'fast medium\|18000' => 18000,
321	'extreme\|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
322	'extreme\|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
323	'fast extreme\|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
324	'fast extreme\|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
325	'standard\|19000' => 19000,
326	'fast standard\|19000' => 19000,
327	'r3mix\|19500' => 19500, // 3.90, 3.90.1, 3.92
328	'r3mix\|19600' => 19600, // 3.90.2, 3.90.3, 3.91
329	'r3mix\|18000' => 18000, // 3.94, 3.95
330	);
331	if (!isset($expected_lowpass[$exploded_options[1].'\|'.$thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000))) {
332	$encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
333	}
334	break;
335
336	default:
337	break;
338	}
339	break;
340	}
341	}
342
343	if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
344	if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
345	$encoder_options .= ' --resample 44100';
346	} elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
347	$encoder_options .= ' --resample 48000';
348	} elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
349	switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
350	case 0: // <= 32000
351	// may or may not be same as source frequency - ignore
352	break;
353	case 1: // 44100
354	case 2: // 48000
355	case 3: // 48000+
356	$exploded_options = explode(' ', $encoder_options, 4);
357	switch ($exploded_options[0]) {
358	case '--preset':
359	case '--alt-preset':
360	switch ($exploded_options[1]) {
361	case 'fast':
362	case 'portable':
363	case 'medium':
364	case 'standard':
365	case 'extreme':
366	case 'insane':
367	$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
368	break;
369
370	default:
371	static $expected_resampled_rate = array (
372	'phon+/lw/mw-eu/sw\|16000' => 16000,
373	'mw-us\|24000' => 24000, // 3.95
374	'mw-us\|32000' => 32000, // 3.93
375	'mw-us\|16000' => 16000, // 3.92
376	'phone\|16000' => 16000,
377	'phone\|11025' => 11025, // 3.94a15
378	'radio\|32000' => 32000, // 3.94a15
379	'fm/radio\|32000' => 32000, // 3.92
380	'fm\|32000' => 32000, // 3.90
381	'voice\|32000' => 32000);
382	if (!isset($expected_resampled_rate[$exploded_options[1].'\|'.$thisfile_mpeg_audio['sample_rate']])) {
383	$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
384	}
385	break;
386	}
387	break;
388
389	case '--r3mix':
390	default:
391	$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
392	break;
393	}
394	break;
395	}
396	}
397	}
398	if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
399	//$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
400	$encoder_options = strtoupper($info['audio']['bitrate_mode']);
401	}
402
403	return $encoder_options;
404	}
405
406
407
408	public function decodeMPEGaudioHeader($fd, $offset, &$info, $recursive_search=true, $scan_as_cbr=false, $fast_mpeg_header_scan=false) {
409
410	static $mpeg_audio_version_lookup;
411	static $mpeg_audio_layer_lookup;
412	static $mpeg_audio_bitrate_lookup;
413	static $mpeg_audio_frequency_lookup;
414	static $mpeg_audio_channel_mode_lookup;
415	static $mpeg_audio_mode_extension_lookup;
416	static $mpeg_audio_emphasis_lookup;
417	if (empty($mpeg_audio_version_lookup)) {
418	$mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();
419	$mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();
420	$mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();
421	$mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray();
422	$mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray();
423	$mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray();
424	$mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray();
425	}
426
427	if ($offset >= $info['avdataend']) {
428
429	// non-fatal error: 'end of file encounter looking for MPEG synch'
430	return;
431
432	}
433	fseek($fd, $offset, SEEK_SET);
434	$header_string = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
435
436	// MP3 audio frame structure:
437	// $aa $aa $aa $aa [$bb $bb] $cc...
438	// where $aa..$aa is the four-byte mpeg-audio header (below)
439	// $bb $bb is the optional 2-byte CRC
440	// and $cc... is the audio data
441
442	$head4 = substr($header_string, 0, 4);
443
444	if (isset($mpeg_audio_header_decode_cache[$head4])) {
445	$mpeg_header_raw_array= $mpeg_audio_header_decode_cache[$head4];
446	} else {
447	$mpeg_header_raw_array = getid3_mp3::MPEGaudioHeaderDecode($head4);
448	$mpeg_audio_header_decode_cache[$head4] = $mpeg_header_raw_array;
449	}
450
451	// Not in cache
452	if (!isset($mpeg_audio_header_valid_cache[$head4])) {
453	$mpeg_audio_header_valid_cache[$head4] = getid3_mp3::MPEGaudioHeaderValid($mpeg_header_raw_array, false, false);
454	}
455
456	// shortcut
457	if (!isset($info['mpeg']['audio'])) {
458	$info['mpeg']['audio'] = array ();
459	}
460	$thisfile_mpeg_audio = &$info['mpeg']['audio'];
461
462
463	if ($mpeg_audio_header_valid_cache[$head4]) {
464	$thisfile_mpeg_audio['raw'] = $mpeg_header_raw_array;
465	} else {
466
467	// non-fatal error: Invalid MPEG audio header at offset $offset
468	return;
469	}
470
471	if (!$fast_mpeg_header_scan) {
472
473	$thisfile_mpeg_audio['version'] = $mpeg_audio_version_lookup[$thisfile_mpeg_audio['raw']['version']];
474	$thisfile_mpeg_audio['layer'] = $mpeg_audio_layer_lookup[$thisfile_mpeg_audio['raw']['layer']];
475
476	$thisfile_mpeg_audio['channelmode'] = $mpeg_audio_channel_mode_lookup[$thisfile_mpeg_audio['raw']['channelmode']];
477	$thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
478	$thisfile_mpeg_audio['sample_rate'] = $mpeg_audio_frequency_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
479	$thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
480	$thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
481	$thisfile_mpeg_audio['modeextension'] = $mpeg_audio_mode_extension_lookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
482	$thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
483	$thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
484	$thisfile_mpeg_audio['emphasis'] = $mpeg_audio_emphasis_lookup[$thisfile_mpeg_audio['raw']['emphasis']];
485
486	$info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
487	$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
488
489	if ($thisfile_mpeg_audio['protection']) {
490	$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($header_string, 4, 2));
491	}
492
493	}
494
495	if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
496	// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
497	$this->getid3->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1');
498	$thisfile_mpeg_audio['raw']['bitrate'] = 0;
499	}
500	$thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
501	$thisfile_mpeg_audio['bitrate'] = $mpeg_audio_bitrate_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
502
503	if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
504	// only skip multiple frame check if free-format bitstream found at beginning of file
505	// otherwise is quite possibly simply corrupted data
506	$recursive_search = false;
507	}
508
509	// For Layer 2 there are some combinations of bitrate and mode which are not allowed.
510	if (!$fast_mpeg_header_scan && ($thisfile_mpeg_audio['layer'] == '2')) {
511
512	$info['audio']['dataformat'] = 'mp2';
513	switch ($thisfile_mpeg_audio['channelmode']) {
514
515	case 'mono':
516	if (($thisfile_mpeg_audio['bitrate'] == 'free') \|\| ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
517	// these are ok
518	} else {
519
520	// non-fatal error: bitrate not allowed in Layer 2/mono
521	return;
522	}
523	break;
524
525	case 'stereo':
526	case 'joint stereo':
527	case 'dual channel':
528	if (($thisfile_mpeg_audio['bitrate'] == 'free') \|\| ($thisfile_mpeg_audio['bitrate'] == 64000) \|\| ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
529	// these are ok
530	} else {
531
532	// non-fatal error: bitrate not allowed in Layer 2/stereo/joint stereo/dual channel
533	return;
534	}
535	break;
536
537	}
538
539	}
540
541
542	if ($info['audio']['sample_rate'] > 0) {
543	$thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
544	}
545
546	$next_frame_test_offset = $offset + 1;
547	if ($thisfile_mpeg_audio['bitrate'] != 'free') {
548
549	$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
550
551	if (isset($thisfile_mpeg_audio['framelength'])) {
552	$next_frame_test_offset = $offset + $thisfile_mpeg_audio['framelength'];
553	} else {
554
555	// non-fatal error: Frame at offset('.$offset.') is has an invalid frame length.
556	return;
557	}
558
559	}
560
561	$expected_number_of_audio_bytes = 0;
562
563	////////////////////////////////////////////////////////////////////////////////////
564	// Variable-bitrate headers
565
566	if (substr($header_string, 4 + 32, 4) == 'VBRI') {
567	// Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
568	// specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
569
570	$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
571	$thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
572	$info['audio']['codec'] = 'Fraunhofer';
573
574	$side_info_data = substr($header_string, 4 + 2, 32);
575
576	$fraunhofer_vbr_offset = 36;
577
578	$thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 4, 2)); // VbriVersion
579	$thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 6, 2)); // VbriDelay
580	$thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 8, 2)); // VbriQuality
581	$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 10, 4)); // VbriStreamBytes
582	$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 14, 4)); // VbriStreamFrames
583	$thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 18, 2)); // VbriTableSize
584	$thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 20, 2)); // VbriTableScale
585	$thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 22, 2)); // VbriEntryBytes
586	$thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 24, 2)); // VbriEntryFrames
587
588	$expected_number_of_audio_bytes = $thisfile_mpeg_audio['VBR_bytes'];
589
590	$previous_byte_offset = $offset;
591	for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
592	$fraunhofer_offset_n = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset, $thisfile_mpeg_audio['VBR_entry_bytes']));
593	$fraunhofer_vbr_offset += $thisfile_mpeg_audio['VBR_entry_bytes'];
594	$thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']);
595	$thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']) + $previous_byte_offset;
596	$previous_byte_offset += $fraunhofer_offset_n;
597	}
598
599
600	} else {
601
602	// Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
603	// depending on MPEG layer and number of channels
604
605	$vbr_id_offset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
606	$side_info_data = substr($header_string, 4 + 2, $vbr_id_offset - 4);
607
608	if ((substr($header_string, $vbr_id_offset, strlen('Xing')) == 'Xing') \|\| (substr($header_string, $vbr_id_offset, strlen('Info')) == 'Info')) {
609	// 'Xing' is traditional Xing VBR frame
610	// 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
611	// 'Info' can legally be used to specify a VBR file as well, however.
612
613	// http://www.multiweb.cz/twoinches/MP3inside.htm
614	//00..03 = "Xing" or "Info"
615	//04..07 = Flags:
616	// 0x01 Frames Flag set if value for number of frames in file is stored
617	// 0x02 Bytes Flag set if value for filesize in bytes is stored
618	// 0x04 TOC Flag set if values for TOC are stored
619	// 0x08 VBR Scale Flag set if values for VBR scale is stored
620	//08..11 Frames: Number of frames in file (including the first Xing/Info one)
621	//12..15 Bytes: File length in Bytes
622	//16..115 TOC (Table of Contents):
623	// Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
624	// Each Byte has a value according this formula:
625	// (TOC[i] / 256) * fileLenInBytes
626	// So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
627	// TOC[(60/240)*100] = TOC[25]
628	// and corresponding Byte in file is then approximately at:
629	// (TOC[25]/256) * 5000000
630	//116..119 VBR Scale
631
632
633	// should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
634	$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
635	$thisfile_mpeg_audio['VBR_method'] = 'Xing';
636
637	$thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 4, 4));
638
639	$thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
640	$thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
641	$thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
642	$thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
643
644	if ($thisfile_mpeg_audio['xing_flags']['frames']) {
645	$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 8, 4));
646	}
647	if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
648	$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 12, 4));
649	}
650
651	if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
652
653	$frame_lengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];
654
655	if ($thisfile_mpeg_audio['layer'] == '1') {
656	// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
657	$info['audio']['bitrate'] = ($frame_lengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
658	} else {
659	// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
660	$info['audio']['bitrate'] = $frame_lengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
661	}
662	$thisfile_mpeg_audio['framelength'] = floor($frame_lengthfloat);
663	}
664
665	if ($thisfile_mpeg_audio['xing_flags']['toc']) {
666	$lame_toc_data = substr($header_string, $vbr_id_offset + 16, 100);
667	for ($i = 0; $i < 100; $i++) {
668	$thisfile_mpeg_audio['toc'][$i] = ord($lame_toc_data{$i});
669	}
670	}
671	if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
672	$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 116, 4));
673	}
674
675
676	// http://gabriel.mp3-tech.org/mp3infotag.html
677	if (substr($header_string, $vbr_id_offset + 120, 4) == 'LAME') {
678
679	// shortcut
680	$thisfile_mpeg_audio['LAME'] = array ();
681	$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
682
683
684	$thisfile_mpeg_audio_lame['long_version'] = substr($header_string, $vbr_id_offset + 120, 20);
685	$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
686
687	if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
688
689	// extra 11 chars are not part of version string when LAMEtag present
690	unset($thisfile_mpeg_audio_lame['long_version']);
691
692	// It the LAME tag was only introduced in LAME v3.90
693	// http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
694
695	// Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
696	// are assuming a 'Xing' identifier offset of 0x24, which is the case for
697	// MPEG-1 non-mono, but not for other combinations
698	$lame_tag_offset_contant = $vbr_id_offset - 0x24;
699
700	// shortcuts
701	$thisfile_mpeg_audio_lame['RGAD'] = array ('track'=>array(), 'album'=>array());
702	$thisfile_mpeg_audio_lame_rgad = &$thisfile_mpeg_audio_lame['RGAD'];
703	$thisfile_mpeg_audio_lame_rgad_track = &$thisfile_mpeg_audio_lame_rgad['track'];
704	$thisfile_mpeg_audio_lame_rgad_album = &$thisfile_mpeg_audio_lame_rgad['album'];
705	$thisfile_mpeg_audio_lame['raw'] = array ();
706	$thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
707
708	// byte $9B VBR Quality
709	// This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
710	// Actually overwrites original Xing bytes
711	unset($thisfile_mpeg_audio['VBR_scale']);
712	$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0x9B, 1));
713
714	// bytes $9C-$A4 Encoder short VersionString
715	$thisfile_mpeg_audio_lame['short_version'] = substr($header_string, $lame_tag_offset_contant + 0x9C, 9);
716
717	// byte $A5 Info Tag revision + VBR method
718	$lame_tagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA5, 1));
719
720	$thisfile_mpeg_audio_lame['tag_revision'] = ($lame_tagRevisionVBRmethod & 0xF0) >> 4;
721	$thisfile_mpeg_audio_lame_raw['vbr_method'] = $lame_tagRevisionVBRmethod & 0x0F;
722	$thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
723	$thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
724
725	// byte $A6 Lowpass filter value
726	$thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA6, 1)) * 100;
727
728	// bytes $A7-$AE Replay Gain
729	// http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
730	// bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
731	if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
732	// LAME 3.94a16 and later - 9.23 fixed point
733	// ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
734	$thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA7, 4))) / 8388608);
735	} else {
736	// LAME 3.94a15 and earlier - 32-bit floating point
737	// Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
738	$thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($header_string, $lame_tag_offset_contant + 0xA7, 4));
739	}
740	if ($thisfile_mpeg_audio_lame_rgad['peak_amplitude'] == 0) {
741	unset($thisfile_mpeg_audio_lame_rgad['peak_amplitude']);
742	} else {
743	$thisfile_mpeg_audio_lame_rgad['peak_db'] = 20 * log10($thisfile_mpeg_audio_lame_rgad['peak_amplitude']);
744	}
745
746	$thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAB, 2));
747	$thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAD, 2));
748
749
750	if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
751
752	$thisfile_mpeg_audio_lame_rgad_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
753	$thisfile_mpeg_audio_lame_rgad_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
754	$thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
755	$thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
756	$thisfile_mpeg_audio_lame_rgad_track['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['name']);
757	$thisfile_mpeg_audio_lame_rgad_track['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['originator']);
758	$thisfile_mpeg_audio_lame_rgad_track['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit']);
759
760	if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) {
761	$info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude'];
762	}
763	$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_rgad_track['originator'];
764	$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_track['gain_db'];
765	} else {
766	unset($thisfile_mpeg_audio_lame_rgad['track']);
767	}
768	if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
769
770	$thisfile_mpeg_audio_lame_rgad_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
771	$thisfile_mpeg_audio_lame_rgad_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
772	$thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
773	$thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
774	$thisfile_mpeg_audio_lame_rgad_album['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['name']);
775	$thisfile_mpeg_audio_lame_rgad_album['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['originator']);
776	$thisfile_mpeg_audio_lame_rgad_album['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit']);
777
778	if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) {
779	$info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude'];
780	}
781	$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_rgad_album['originator'];
782	$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_album['gain_db'];
783	} else {
784	unset($thisfile_mpeg_audio_lame_rgad['album']);
785	}
786	if (empty($thisfile_mpeg_audio_lame_rgad)) {
787	unset($thisfile_mpeg_audio_lame['RGAD']);
788	}
789
790
791	// byte $AF Encoding flags + ATH Type
792	$encoding_flags_ath_type = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAF, 1));
793	$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($encoding_flags_ath_type & 0x10);
794	$thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($encoding_flags_ath_type & 0x20);
795	$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($encoding_flags_ath_type & 0x40);
796	$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($encoding_flags_ath_type & 0x80);
797	$thisfile_mpeg_audio_lame['ath_type'] = $encoding_flags_ath_type & 0x0F;
798
799	// byte $B0 if ABR {specified bitrate} else {minimal bitrate}
800	$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB0, 1));
801	if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
802	$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
803	} elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
804	// ignore
805	} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
806	$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
807	}
808
809	// bytes $B1-$B3 Encoder delays
810	$encoder_delays = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB1, 3));
811	$thisfile_mpeg_audio_lame['encoder_delay'] = ($encoder_delays & 0xFFF000) >> 12;
812	$thisfile_mpeg_audio_lame['end_padding'] = $encoder_delays & 0x000FFF;
813
814	// byte $B4 Misc
815	$misc_byte = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB4, 1));
816	$thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($misc_byte & 0x03);
817	$thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($misc_byte & 0x1C) >> 2;
818	$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($misc_byte & 0x20) >> 5;
819	$thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($misc_byte & 0xC0) >> 6;
820	$thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
821	$thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
822	$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
823	$thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
824
825	// byte $B5 MP3 Gain
826	$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB5, 1), false, true);
827	$thisfile_mpeg_audio_lame['mp3_gain_db'] = (20 * log10(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
828	$thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
829
830	// bytes $B6-$B7 Preset and surround info
831	$PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB6, 2));
832	// Reserved = ($PresetSurroundBytes & 0xC000);
833	$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
834	$thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
835	$thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
836	$thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
837	if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
838	$this->getid3->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');
839	}
840	if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
841	// this may change if 3.90.4 ever comes out
842	$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
843	}
844
845	// bytes $B8-$BB MusicLength
846	$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB8, 4));
847	$expected_number_of_audio_bytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
848
849	// bytes $BC-$BD MusicCRC
850	$thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBC, 2));
851
852	// bytes $BE-$BF CRC-16 of Info Tag
853	$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBE, 2));
854
855
856	// LAME CBR
857	if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
858
859	$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
860	$thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
861	$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
862
863	}
864
865	}
866	}
867
868	} else {
869
870	// not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
871	$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
872	if ($recursive_search) {
873	$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
874	if (getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, true)) {
875	$recursive_search = false;
876	$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
877	}
878	if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
879	$this->getid3->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');
880	}
881	}
882
883	}
884
885	}
886
887	if (($expected_number_of_audio_bytes > 0) && ($expected_number_of_audio_bytes != ($info['avdataend'] - $info['avdataoffset']))) {
888	if ($expected_number_of_audio_bytes > ($info['avdataend'] - $info['avdataoffset'])) {
889	if (($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
890	$this->getid3->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
891	} else {
892	$this->getid3->warning('Probable truncated file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');
893	}
894	} else {
895	if ((($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes) == 1) {
896	$info['avdataend']--;
897	} else {
898	$this->getid3->warning('Too much data in file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes).' bytes too many)');
899	}
900	}
901	}
902
903	if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
904	if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
905	$frame_byte_length = getid3_mp3::FreeFormatFrameLength($fd, $offset, $info, true);
906	if ($frame_byte_length > 0) {
907	$thisfile_mpeg_audio['framelength'] = $frame_byte_length;
908	if ($thisfile_mpeg_audio['layer'] == '1') {
909	// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
910	$info['audio']['bitrate'] = ((($frame_byte_length / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
911	} else {
912	// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
913	$info['audio']['bitrate'] = (($frame_byte_length - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
914	}
915	} else {
916
917	// non-fatal error: Error calculating frame length of free-format MP3 without Xing/LAME header.
918	return;
919	}
920	}
921	}
922
923	if (@$thisfile_mpeg_audio['VBR_frames']) {
924	switch ($thisfile_mpeg_audio['bitrate_mode']) {
925	case 'vbr':
926	case 'abr':
927	if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
928	$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 384);
929	} elseif ((($thisfile_mpeg_audio['version'] == '2') \|\| ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
930	$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 576);
931	} else {
932	$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 1152);
933	}
934	if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
935	$info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
936	$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
937	}
938	break;
939	}
940	}
941
942	// End variable-bitrate headers
943	////////////////////////////////////////////////////////////////////////////////////
944
945	if ($recursive_search) {
946
947	if (!getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, $scan_as_cbr)) {
948	return false;
949	}
950
951	}
952
953	return true;
954	}
955
956
957
958	public function RecursiveFrameScanning(&$fd, &$info, &$offset, &$next_frame_test_offset, $scan_as_cbr) {
959	for ($i = 0; $i < getid3_mp3::VALID_CHECK_FRAMES; $i++) {
960	// check next getid3_mp3::VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
961	if (($next_frame_test_offset + 4) >= $info['avdataend']) {
962	// end of file
963	return true;
964	}
965
966	$next_frame_test_array = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
967	if ($this->decodeMPEGaudioHeader($fd, $next_frame_test_offset, $next_frame_test_array, false)) {
968	if ($scan_as_cbr) {
969	// force CBR mode, used for trying to pick out invalid audio streams with
970	// valid(?) VBR headers, or VBR streams with no VBR header
971	if (!isset($next_frame_test_array['mpeg']['audio']['bitrate']) \|\| !isset($info['mpeg']['audio']['bitrate']) \|\| ($next_frame_test_array['mpeg']['audio']['bitrate'] != $info['mpeg']['audio']['bitrate'])) {
972	return false;
973	}
974	}
975
976
977	// next frame is OK, get ready to check the one after that
978	if (isset($next_frame_test_array['mpeg']['audio']['framelength']) && ($next_frame_test_array['mpeg']['audio']['framelength'] > 0)) {
979	$next_frame_test_offset += $next_frame_test_array['mpeg']['audio']['framelength'];
980	} else {
981
982	// non-fatal error: Frame at offset $offset has an invalid frame length.
983	return;
984	}
985
986	} else {
987
988	// non-fatal error: Next frame is not valid.
989	return;
990	}
991	}
992	return true;
993	}
994
995
996
997	public function FreeFormatFrameLength($fd, $offset, &$info, $deep_scan=false) {
998	fseek($fd, $offset, SEEK_SET);
999	$mpeg_audio_data = fread($fd, 32768);
1000
1001	$sync_pattern1 = substr($mpeg_audio_data, 0, 4);
1002	// may be different pattern due to padding
1003	$sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) \| 0x02).$sync_pattern1{3};
1004	if ($sync_pattern2 === $sync_pattern1) {
1005	$sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) & 0xFD).$sync_pattern1{3};
1006	}
1007
1008	$frame_length = false;
1009	$frame_length1 = strpos($mpeg_audio_data, $sync_pattern1, 4);
1010	$frame_length2 = strpos($mpeg_audio_data, $sync_pattern2, 4);
1011	if ($frame_length1 > 4) {
1012	$frame_length = $frame_length1;
1013	}
1014	if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) {
1015	$frame_length = $frame_length2;
1016	}
1017	if (!$frame_length) {
1018
1019	// LAME 3.88 has a different value for modeextension on the first frame vs the rest
1020	$frame_length1 = strpos($mpeg_audio_data, substr($sync_pattern1, 0, 3), 4);
1021	$frame_length2 = strpos($mpeg_audio_data, substr($sync_pattern2, 0, 3), 4);
1022
1023	if ($frame_length1 > 4) {
1024	$frame_length = $frame_length1;
1025	}
1026	if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) {
1027	$frame_length = $frame_length2;
1028	}
1029	if (!$frame_length) {
1030	throw new getid3_exception('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($sync_pattern1).' or '.getid3_lib::PrintHexBytes($sync_pattern2).') after offset '.$offset);
1031	} else {
1032	$this->getid3->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)');
1033	$info['audio']['codec'] = 'LAME';
1034	$info['audio']['encoder'] = 'LAME3.88';
1035	$sync_pattern1 = substr($sync_pattern1, 0, 3);
1036	$sync_pattern2 = substr($sync_pattern2, 0, 3);
1037	}
1038	}
1039
1040	if ($deep_scan) {
1041
1042	$actual_frame_length_values = array ();
1043	$next_offset = $offset + $frame_length;
1044	while ($next_offset < ($info['avdataend'] - 6)) {
1045	fseek($fd, $next_offset - 1, SEEK_SET);
1046	$NextSyncPattern = fread($fd, 6);
1047	if ((substr($NextSyncPattern, 1, strlen($sync_pattern1)) == $sync_pattern1) \|\| (substr($NextSyncPattern, 1, strlen($sync_pattern2)) == $sync_pattern2)) {
1048	// good - found where expected
1049	$actual_frame_length_values[] = $frame_length;
1050	} elseif ((substr($NextSyncPattern, 0, strlen($sync_pattern1)) == $sync_pattern1) \|\| (substr($NextSyncPattern, 0, strlen($sync_pattern2)) == $sync_pattern2)) {
1051	// ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1052	$actual_frame_length_values[] = ($frame_length - 1);
1053	$next_offset--;
1054	} elseif ((substr($NextSyncPattern, 2, strlen($sync_pattern1)) == $sync_pattern1) \|\| (substr($NextSyncPattern, 2, strlen($sync_pattern2)) == $sync_pattern2)) {
1055	// ok - found one byte later than expected (last frame was padded, first frame wasn't)
1056	$actual_frame_length_values[] = ($frame_length + 1);
1057	$next_offset++;
1058	} else {
1059	throw new getid3_exception('Did not find expected free-format sync pattern at offset '.$next_offset);
1060	}
1061	$next_offset += $frame_length;
1062	}
1063	if (count($actual_frame_length_values) > 0) {
1064	$frame_length = intval(round(array_sum($actual_frame_length_values) / count($actual_frame_length_values)));
1065	}
1066	}
1067	return $frame_length;
1068	}
1069
1070
1071
1072	public function getOnlyMPEGaudioInfo($fd, &$info, $avdata_offset, $bit_rate_histogram=false) {
1073
1074	// looks for synch, decodes MPEG audio header
1075
1076	fseek($fd, $avdata_offset, SEEK_SET);
1077
1078	$sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdata_offset);
1079	$header = fread($fd, $sync_seek_buffer_size);
1080	$sync_seek_buffer_size = strlen($header);
1081	$synch_seek_offset = 0;
1082
1083	static $mpeg_audio_version_lookup;
1084	static $mpeg_audio_layer_lookup;
1085	static $mpeg_audio_bitrate_lookup;
1086	if (empty($mpeg_audio_version_lookup)) {
1087	$mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();
1088	$mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();
1089	$mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();
1090
1091	}
1092
1093	while ($synch_seek_offset < $sync_seek_buffer_size) {
1094
1095	if ((($avdata_offset + $synch_seek_offset) < $info['avdataend']) && !feof($fd)) {
1096
1097	// if a synch's not found within the first 128k bytes, then give up
1098	if ($synch_seek_offset > $sync_seek_buffer_size) {
1099	throw new getid3_exception('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB');
1100	}
1101
1102	if (feof($fd)) {
1103	throw new getid3_exception('Could not find valid MPEG audio synch before end of file');
1104	}
1105	}
1106
1107	if (($synch_seek_offset + 1) >= strlen($header)) {
1108	throw new getid3_exception('Could not find valid MPEG synch before end of file');
1109	}
1110
1111	if (($header{$synch_seek_offset} == "\xFF") && ($header{($synch_seek_offset + 1)} > "\xE0")) { // synch detected
1112
1113	if (!isset($first_frame_info) && !isset($info['mpeg']['audio'])) {
1114	$first_frame_info = $info;
1115	$first_frame_avdata_offset = $avdata_offset + $synch_seek_offset;
1116	if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $first_frame_info, false)) {
1117	// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1118	// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1119	unset($first_frame_info);
1120	}
1121	}
1122
1123	$dummy = $info; // only overwrite real data if valid header found
1124	if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $dummy, true)) {
1125	$info = $dummy;
1126	$info['avdataoffset'] = $avdata_offset + $synch_seek_offset;
1127
1128	switch (@$info['fileformat']) {
1129	case '':
1130	case 'mp3':
1131	$info['fileformat'] = 'mp3';
1132	$info['audio']['dataformat'] = 'mp3';
1133	break;
1134	}
1135	if (isset($first_frame_info['mpeg']['audio']['bitrate_mode']) && ($first_frame_info['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1136	if (!(abs($info['audio']['bitrate'] - $first_frame_info['audio']['bitrate']) <= 1)) {
1137	// If there is garbage data between a valid VBR header frame and a sequence
1138	// of valid MPEG-audio frames the VBR data is no longer discarded.
1139	$info = $first_frame_info;
1140	$info['avdataoffset'] = $first_frame_avdata_offset;
1141	$info['fileformat'] = 'mp3';
1142	$info['audio']['dataformat'] = 'mp3';
1143	$dummy = $info;
1144	unset($dummy['mpeg']['audio']);
1145	$GarbageOffsetStart = $first_frame_avdata_offset + $first_frame_info['mpeg']['audio']['framelength'];
1146	$GarbageOffsetEnd = $avdata_offset + $synch_seek_offset;
1147	if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
1148
1149	$info = $dummy;
1150	$info['avdataoffset'] = $GarbageOffsetEnd;
1151	$this->getid3->warning('apparently-valid VBR header not used because could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd);
1152
1153	} else {
1154
1155	$this->getid3->warning('using data from VBR header even though could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')');
1156
1157	}
1158	}
1159	}
1160	if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
1161	// VBR file with no VBR header
1162	$bit_rate_histogram = true;
1163	}
1164
1165	if ($bit_rate_histogram) {
1166
1167	$info['mpeg']['audio']['stereo_distribution'] = array ('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1168	$info['mpeg']['audio']['version_distribution'] = array ('1'=>0, '2'=>0, '2.5'=>0);
1169
1170	if ($info['mpeg']['audio']['version'] == '1') {
1171	if ($info['mpeg']['audio']['layer'] == 3) {
1172	$info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
1173	} elseif ($info['mpeg']['audio']['layer'] == 2) {
1174	$info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
1175	} elseif ($info['mpeg']['audio']['layer'] == 1) {
1176	$info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1177	}
1178	} elseif ($info['mpeg']['audio']['layer'] == 1) {
1179	$info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0);
1180	} else {
1181	$info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0);
1182	}
1183
1184	$dummy = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
1185	$synch_start_offset = $info['avdataoffset'];
1186
1187	$fast_mode = false;
1188	$synch_errors_found = 0;
1189	while ($this->decodeMPEGaudioHeader($fd, $synch_start_offset, $dummy, false, false, $fast_mode)) {
1190	$fast_mode = true;
1191	$thisframebitrate = $mpeg_audio_bitrate_lookup[$mpeg_audio_version_lookup[$dummy['mpeg']['audio']['raw']['version']]][$mpeg_audio_layer_lookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1192
1193	if (empty($dummy['mpeg']['audio']['framelength'])) {
1194	$synch_errors_found++;
1195	}
1196	else {
1197	@$info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
1198	@$info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
1199	@$info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
1200
1201	$synch_start_offset += $dummy['mpeg']['audio']['framelength'];
1202	}
1203	}
1204	if ($synch_errors_found > 0) {
1205	$this->getid3->warning('Found '.$synch_errors_found.' synch errors in histogram analysis');
1206	}
1207
1208	$bit_total = 0;
1209	$frame_counter = 0;
1210	foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {
1211	$frame_counter += $bit_rate_count;
1212	if ($bit_rate_value != 'free') {
1213	$bit_total += ($bit_rate_value * $bit_rate_count);
1214	}
1215	}
1216	if ($frame_counter == 0) {
1217	throw new getid3_exception('Corrupt MP3 file: framecounter == zero');
1218	}
1219	$info['mpeg']['audio']['frame_count'] = $frame_counter;
1220	$info['mpeg']['audio']['bitrate'] = ($bit_total / $frame_counter);
1221
1222	$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1223
1224
1225	// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1226	$distinct_bit_rates = 0;
1227	foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {
1228	if ($bit_rate_count > 0) {
1229	$distinct_bit_rates++;
1230	}
1231	}
1232	if ($distinct_bit_rates > 1) {
1233	$info['mpeg']['audio']['bitrate_mode'] = 'vbr';
1234	} else {
1235	$info['mpeg']['audio']['bitrate_mode'] = 'cbr';
1236	}
1237	$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1238
1239	}
1240
1241	break; // exit while()
1242	}
1243	}
1244
1245	$synch_seek_offset++;
1246	if (($avdata_offset + $synch_seek_offset) >= $info['avdataend']) {
1247	// end of file/data
1248
1249	if (empty($info['mpeg']['audio'])) {
1250
1251	throw new getid3_exception('could not find valid MPEG synch before end of file');
1252	}
1253	break;
1254	}
1255
1256	}
1257
1258	$info['audio']['channels'] = $info['mpeg']['audio']['channels'];
1259	$info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
1260	$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1261	return true;
1262	}
1263
1264
1265
1266	public static function MPEGaudioVersionarray() {
1267
1268	static $array = array ('2.5', false, '2', '1');
1269	return $array;
1270	}
1271
1272
1273
1274	public static function MPEGaudioLayerarray() {
1275
1276	static $array = array (false, 3, 2, 1);
1277	return $array;
1278	}
1279
1280
1281
1282	public static function MPEGaudioBitratearray() {
1283
1284	static $array;
1285	if (empty($array)) {
1286	$array = array (
1287	'1' => array (1 => array ('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1288	2 => array ('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1289	3 => array ('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1290	),
1291
1292	'2' => array (1 => array ('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1293	2 => array ('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
1294	)
1295	);
1296	$array['2'][3] = $array['2'][2];
1297	$array['2.5'] = $array['2'];
1298	}
1299	return $array;
1300	}
1301
1302
1303
1304	public static function MPEGaudioFrequencyarray() {
1305
1306	static $array = array (
1307	'1' => array (44100, 48000, 32000),
1308	'2' => array (22050, 24000, 16000),
1309	'2.5' => array (11025, 12000, 8000)
1310	);
1311	return $array;
1312	}
1313
1314
1315
1316	public static function MPEGaudioChannelModearray() {
1317
1318	static $array = array ('stereo', 'joint stereo', 'dual channel', 'mono');
1319	return $array;
1320	}
1321
1322
1323
1324	public static function MPEGaudioModeExtensionarray() {
1325
1326	static $array = array (
1327	1 => array ('4-31', '8-31', '12-31', '16-31'),
1328	2 => array ('4-31', '8-31', '12-31', '16-31'),
1329	3 => array ('', 'IS', 'MS', 'IS+MS')
1330	);
1331	return $array;
1332	}
1333
1334
1335
1336	public static function MPEGaudioEmphasisarray() {
1337
1338	static $array = array ('none', '50/15ms', false, 'CCIT J.17');
1339	return $array;
1340	}
1341
1342
1343
1344	public static function MPEGaudioHeaderBytesValid($head4, $allow_bitrate_15=false) {
1345
1346	return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allow_bitrate_15);
1347	}
1348
1349
1350
1351	public static function MPEGaudioHeaderValid($raw_array, $echo_errors=false, $allow_bitrate_15=false) {
1352
1353	if (($raw_array['synch'] & 0x0FFE) != 0x0FFE) {
1354	return false;
1355	}
1356
1357	static $mpeg_audio_version_lookup;
1358	static $mpeg_audio_layer_lookup;
1359	static $mpeg_audio_bitrate_lookup;
1360	static $mpeg_audio_frequency_lookup;
1361	static $mpeg_audio_channel_mode_lookup;
1362	static $mpeg_audio_mode_extension_lookup;
1363	static $mpeg_audio_emphasis_lookup;
1364	if (empty($mpeg_audio_version_lookup)) {
1365	$mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();
1366	$mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();
1367	$mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();
1368	$mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray();
1369	$mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray();
1370	$mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray();
1371	$mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray();
1372	}
1373
1374	if (isset($mpeg_audio_version_lookup[$raw_array['version']])) {
1375	$decodedVersion = $mpeg_audio_version_lookup[$raw_array['version']];
1376	} else {
1377	echo ($echo_errors ? "\n".'invalid Version ('.$raw_array['version'].')' : '');
1378	return false;
1379	}
1380	if (isset($mpeg_audio_layer_lookup[$raw_array['layer']])) {
1381	$decodedLayer = $mpeg_audio_layer_lookup[$raw_array['layer']];
1382	} else {
1383	echo ($echo_errors ? "\n".'invalid Layer ('.$raw_array['layer'].')' : '');
1384	return false;
1385	}
1386	if (!isset($mpeg_audio_bitrate_lookup[$decodedVersion][$decodedLayer][$raw_array['bitrate']])) {
1387	echo ($echo_errors ? "\n".'invalid Bitrate ('.$raw_array['bitrate'].')' : '');
1388	if ($raw_array['bitrate'] == 15) {
1389	// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1390	// let it go through here otherwise file will not be identified
1391	if (!$allow_bitrate_15) {
1392	return false;
1393	}
1394	} else {
1395	return false;
1396	}
1397	}
1398	if (!isset($mpeg_audio_frequency_lookup[$decodedVersion][$raw_array['sample_rate']])) {
1399	echo ($echo_errors ? "\n".'invalid Frequency ('.$raw_array['sample_rate'].')' : '');
1400	return false;
1401	}
1402	if (!isset($mpeg_audio_channel_mode_lookup[$raw_array['channelmode']])) {
1403	echo ($echo_errors ? "\n".'invalid ChannelMode ('.$raw_array['channelmode'].')' : '');
1404	return false;
1405	}
1406	if (!isset($mpeg_audio_mode_extension_lookup[$decodedLayer][$raw_array['modeextension']])) {
1407	echo ($echo_errors ? "\n".'invalid Mode Extension ('.$raw_array['modeextension'].')' : '');
1408	return false;
1409	}
1410	if (!isset($mpeg_audio_emphasis_lookup[$raw_array['emphasis']])) {
1411	echo ($echo_errors ? "\n".'invalid Emphasis ('.$raw_array['emphasis'].')' : '');
1412	return false;
1413	}
1414	// These are just either set or not set, you can't mess that up :)
1415	// $raw_array['protection'];
1416	// $raw_array['padding'];
1417	// $raw_array['private'];
1418	// $raw_array['copyright'];
1419	// $raw_array['original'];
1420
1421	return true;
1422	}
1423
1424
1425
1426	public static function MPEGaudioHeaderDecode($header_four_bytes) {
1427	// AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
1428	// A - Frame sync (all bits set)
1429	// B - MPEG Audio version ID
1430	// C - Layer description
1431	// D - Protection bit
1432	// E - Bitrate index
1433	// F - Sampling rate frequency index
1434	// G - Padding bit
1435	// H - Private bit
1436	// I - Channel Mode
1437	// J - Mode extension (Only if Joint stereo)
1438	// K - Copyright
1439	// L - Original
1440	// M - Emphasis
1441
1442	if (strlen($header_four_bytes) != 4) {
1443	return false;
1444	}
1445
1446	$mpeg_raw_header['synch'] = (getid3_lib::BigEndian2Int(substr($header_four_bytes, 0, 2)) & 0xFFE0) >> 4;
1447	$mpeg_raw_header['version'] = (ord($header_four_bytes{1}) & 0x18) >> 3; // BB
1448	$mpeg_raw_header['layer'] = (ord($header_four_bytes{1}) & 0x06) >> 1; // CC
1449	$mpeg_raw_header['protection'] = (ord($header_four_bytes{1}) & 0x01); // D
1450	$mpeg_raw_header['bitrate'] = (ord($header_four_bytes{2}) & 0xF0) >> 4; // EEEE
1451	$mpeg_raw_header['sample_rate'] = (ord($header_four_bytes{2}) & 0x0C) >> 2; // FF
1452	$mpeg_raw_header['padding'] = (ord($header_four_bytes{2}) & 0x02) >> 1; // G
1453	$mpeg_raw_header['private'] = (ord($header_four_bytes{2}) & 0x01); // H
1454	$mpeg_raw_header['channelmode'] = (ord($header_four_bytes{3}) & 0xC0) >> 6; // II
1455	$mpeg_raw_header['modeextension'] = (ord($header_four_bytes{3}) & 0x30) >> 4; // JJ
1456	$mpeg_raw_header['copyright'] = (ord($header_four_bytes{3}) & 0x08) >> 3; // K
1457	$mpeg_raw_header['original'] = (ord($header_four_bytes{3}) & 0x04) >> 2; // L
1458	$mpeg_raw_header['emphasis'] = (ord($header_four_bytes{3}) & 0x03); // MM
1459
1460	return $mpeg_raw_header;
1461	}
1462
1463
1464
1465	public static function MPEGaudioFrameLength(&$bit_rate, &$version, &$layer, $padding, &$sample_rate) {
1466
1467	if (!isset($cache[$bit_rate][$version][$layer][$padding][$sample_rate])) {
1468	$cache[$bit_rate][$version][$layer][$padding][$sample_rate] = false;
1469	if ($bit_rate != 'free') {
1470
1471	if ($version == '1') {
1472
1473	if ($layer == '1') {
1474
1475	// For Layer I slot is 32 bits long
1476	$frame_length_coefficient = 48;
1477	$slot_length = 4;
1478
1479	} else { // Layer 2 / 3
1480
1481	// for Layer 2 and Layer 3 slot is 8 bits long.
1482	$frame_length_coefficient = 144;
1483	$slot_length = 1;
1484
1485	}
1486
1487	} else { // MPEG-2 / MPEG-2.5
1488
1489	if ($layer == '1') {
1490
1491	// For Layer I slot is 32 bits long
1492	$frame_length_coefficient = 24;
1493	$slot_length = 4;
1494
1495	} elseif ($layer == '2') {
1496
1497	// for Layer 2 and Layer 3 slot is 8 bits long.
1498	$frame_length_coefficient = 144;
1499	$slot_length = 1;
1500
1501	} else { // layer 3
1502
1503	// for Layer 2 and Layer 3 slot is 8 bits long.
1504	$frame_length_coefficient = 72;
1505	$slot_length = 1;
1506
1507	}
1508
1509	}
1510
1511	// FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
1512	if ($sample_rate > 0) {
1513	$new_frame_length = ($frame_length_coefficient * $bit_rate) / $sample_rate;
1514	$new_frame_length = floor($new_frame_length / $slot_length) * $slot_length; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
1515	if ($padding) {
1516	$new_frame_length += $slot_length;
1517	}
1518	$cache[$bit_rate][$version][$layer][$padding][$sample_rate] = (int) $new_frame_length;
1519	}
1520	}
1521	}
1522	return $cache[$bit_rate][$version][$layer][$padding][$sample_rate];
1523	}
1524
1525
1526
1527	public static function ClosestStandardMP3Bitrate($bit_rate) {
1528
1529	static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
1530	static $bit_rate_table = array (0=>'-');
1531	$round_bit_rate = intval(round($bit_rate, -3));
1532	if (!isset($bit_rate_table[$round_bit_rate])) {
1533	if ($round_bit_rate > 320000) {
1534	$bit_rate_table[$round_bit_rate] = round($bit_rate, -4);
1535	} else {
1536	$last_bit_rate = 320000;
1537	foreach ($standard_bit_rates as $standard_bit_rate) {
1538	$bit_rate_table[$round_bit_rate] = $standard_bit_rate;
1539	if ($round_bit_rate >= $standard_bit_rate - (($last_bit_rate - $standard_bit_rate) / 2)) {
1540	break;
1541	}
1542	$last_bit_rate = $standard_bit_rate;
1543	}
1544	}
1545	}
1546	return $bit_rate_table[$round_bit_rate];
1547	}
1548
1549
1550
1551	public static function XingVBRidOffset($version, $channel_mode) {
1552
1553	static $lookup = array (
1554	'1' => array ('mono' => 0x15, // 4 + 17 = 21
1555	'stereo' => 0x24, // 4 + 32 = 36
1556	'joint stereo' => 0x24,
1557	'dual channel' => 0x24
1558	),
1559
1560	'2' => array ('mono' => 0x0D, // 4 + 9 = 13
1561	'stereo' => 0x15, // 4 + 17 = 21
1562	'joint stereo' => 0x15,
1563	'dual channel' => 0x15
1564	),
1565
1566	'2.5' => array ('mono' => 0x15,
1567	'stereo' => 0x15,
1568	'joint stereo' => 0x15,
1569	'dual channel' => 0x15
1570	)
1571	);
1572
1573	return $lookup[$version][$channel_mode];
1574	}
1575
1576
1577
1578	public static function LAMEvbrMethodLookup($vbr_method_id) {
1579
1580	static $lookup = array (
1581	0x00 => 'unknown',
1582	0x01 => 'cbr',
1583	0x02 => 'abr',
1584	0x03 => 'vbr-old / vbr-rh',
1585	0x04 => 'vbr-new / vbr-mtrh',
1586	0x05 => 'vbr-mt',
1587	0x06 => 'Full VBR Method 4',
1588	0x08 => 'constant bitrate 2 pass',
1589	0x09 => 'abr 2 pass',
1590	0x0F => 'reserved'
1591	);
1592	return (isset($lookup[$vbr_method_id]) ? $lookup[$vbr_method_id] : '');
1593	}
1594
1595
1596
1597	public static function LAMEmiscStereoModeLookup($stereo_mode_id) {
1598
1599	static $lookup = array (
1600	0 => 'mono',
1601	1 => 'stereo',
1602	2 => 'dual mono',
1603	3 => 'joint stereo',
1604	4 => 'forced stereo',
1605	5 => 'auto',
1606	6 => 'intensity stereo',
1607	7 => 'other'
1608	);
1609	return (isset($lookup[$stereo_mode_id]) ? $lookup[$stereo_mode_id] : '');
1610	}
1611
1612
1613
1614	public static function LAMEmiscSourceSampleFrequencyLookup($source_sample_frequency_id) {
1615
1616	static $lookup = array (
1617	0 => '<= 32 kHz',
1618	1 => '44.1 kHz',
1619	2 => '48 kHz',
1620	3 => '> 48kHz'
1621	);
1622	return (isset($lookup[$source_sample_frequency_id]) ? $lookup[$source_sample_frequency_id] : '');
1623	}
1624
1625
1626
1627	public static function LAMEsurroundInfoLookup($surround_info_id) {
1628
1629	static $lookup = array (
1630	0 => 'no surround info',
1631	1 => 'DPL encoding',
1632	2 => 'DPL2 encoding',
1633	3 => 'Ambisonic encoding'
1634	);
1635	return (isset($lookup[$surround_info_id]) ? $lookup[$surround_info_id] : 'reserved');
1636	}
1637
1638
1639
1640	public static function LAMEpresetUsedLookup($lame_tag) {
1641
1642	if ($lame_tag['preset_used_id'] == 0) {
1643	// no preset used (LAME >=3.93)
1644	// no preset recorded (LAME <3.93)
1645	return '';
1646	}
1647
1648	$lame_preset_used_lookup = array ();
1649
1650	for ($i = 8; $i <= 320; $i++) {
1651	switch ($lame_tag['vbr_method']) {
1652	case 'cbr':
1653	$lame_preset_used_lookup[$i] = '--alt-preset '.$lame_tag['vbr_method'].' '.$i;
1654	break;
1655	case 'abr':
1656	default: // other VBR modes shouldn't be here(?)
1657	$lame_preset_used_lookup[$i] = '--alt-preset '.$i;
1658	break;
1659	}
1660	}
1661
1662	// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
1663
1664	// named alt-presets
1665	$lame_preset_used_lookup[1000] = '--r3mix';
1666	$lame_preset_used_lookup[1001] = '--alt-preset standard';
1667	$lame_preset_used_lookup[1002] = '--alt-preset extreme';
1668	$lame_preset_used_lookup[1003] = '--alt-preset insane';
1669	$lame_preset_used_lookup[1004] = '--alt-preset fast standard';
1670	$lame_preset_used_lookup[1005] = '--alt-preset fast extreme';
1671	$lame_preset_used_lookup[1006] = '--alt-preset medium';
1672	$lame_preset_used_lookup[1007] = '--alt-preset fast medium';
1673
1674	// LAME 3.94 additions/changes
1675	$lame_preset_used_lookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
1676	$lame_preset_used_lookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
1677
1678	$lame_preset_used_lookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
1679	$lame_preset_used_lookup[410] = '-V9';
1680	$lame_preset_used_lookup[420] = '-V8';
1681	$lame_preset_used_lookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
1682	$lame_preset_used_lookup[440] = '-V6';
1683	$lame_preset_used_lookup[450] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
1684	$lame_preset_used_lookup[460] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
1685	$lame_preset_used_lookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
1686	$lame_preset_used_lookup[480] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
1687	$lame_preset_used_lookup[490] = '-V1';
1688	$lame_preset_used_lookup[500] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
1689
1690	return (isset($lame_preset_used_lookup[$lame_tag['preset_used_id']]) ? $lame_preset_used_lookup[$lame_tag['preset_used_id']] : 'new/unknown preset: '.$lame_tag['preset_used_id'].' - report to info@getid3.org');
1691	}
1692
1693
1694	}
1695
1696	?>

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