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module.audio.mp3.php @ 31945

Last change on this file since 31945 was 24676, checked in by ddtddt, 11 years ago
[extensions] - piwigo_videojs - add file for translate
File size: 97.2 KB

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1	<?php
2	/////////////////////////////////////////////////////////////////
3	/// getID3() by James Heinrich <info@getid3.org> //
4	// available at http://getid3.sourceforge.net //
5	// or http://www.getid3.org //
6	/////////////////////////////////////////////////////////////////
7	// See readme.txt for more details //
8	/////////////////////////////////////////////////////////////////
9	// //
10	// module.audio.mp3.php //
11	// module for analyzing MP3 files //
12	// dependencies: NONE //
13	// ///
14	/////////////////////////////////////////////////////////////////
15
16
17	// number of frames to scan to determine if MPEG-audio sequence is valid
18	// Lower this number to 5-20 for faster scanning
19	// Increase this number to 50+ for most accurate detection of valid VBR/CBR
20	// mpeg-audio streams
21	define('GETID3_MP3_VALID_CHECK_FRAMES', 35);
22
23
24	class getid3_mp3 extends getid3_handler
25	{
26
27	public $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files
28
29	public function Analyze() {
30	$info = &$this->getid3->info;
31
32	$initialOffset = $info['avdataoffset'];
33
34	if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
35	if ($this->allow_bruteforce) {
36	$info['error'][] = 'Rescanning file in BruteForce mode';
37	$this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info);
38	}
39	}
40
41
42	if (isset($info['mpeg']['audio']['bitrate_mode'])) {
43	$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
44	}
45
46	if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) \|\| (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
47
48	$synchoffsetwarning = 'Unknown data before synch ';
49	if (isset($info['id3v2']['headerlength'])) {
50	$synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
51	} elseif ($initialOffset > 0) {
52	$synchoffsetwarning .= '(should be at '.$initialOffset.', ';
53	} else {
54	$synchoffsetwarning .= '(should be at beginning of file, ';
55	}
56	$synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
57	if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
58
59	if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
60
61	$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
62	$info['audio']['codec'] = 'LAME';
63	$CurrentDataLAMEversionString = 'LAME3.';
64
65	} elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
66
67	$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
68	$info['audio']['codec'] = 'LAME';
69	$CurrentDataLAMEversionString = 'LAME3.';
70
71	}
72
73	}
74	$info['warning'][] = $synchoffsetwarning;
75
76	}
77
78	if (isset($info['mpeg']['audio']['LAME'])) {
79	$info['audio']['codec'] = 'LAME';
80	if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
81	$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
82	} elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
83	$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
84	}
85	}
86
87	$CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
88	if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
89	// a version number of LAME that does not end with a number like "LAME3.92"
90	// or with a closing parenthesis like "LAME3.88 (alpha)"
91	// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
92
93	// not sure what the actual last frame length will be, but will be less than or equal to 1441
94	$PossiblyLongerLAMEversion_FrameLength = 1441;
95
96	// Not sure what version of LAME this is - look in padding of last frame for longer version string
97	$PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
98	fseek($this->getid3->fp, $PossibleLAMEversionStringOffset);
99	$PossiblyLongerLAMEversion_Data = fread($this->getid3->fp, $PossiblyLongerLAMEversion_FrameLength);
100	switch (substr($CurrentDataLAMEversionString, -1)) {
101	case 'a':
102	case 'b':
103	// "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
104	// need to trim off "a" to match longer string
105	$CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
106	break;
107	}
108	if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
109	if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
110	$PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
111	if (empty($info['audio']['encoder']) \|\| (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
112	$info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
113	}
114	}
115	}
116	}
117	if (!empty($info['audio']['encoder'])) {
118	$info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
119	}
120
121	switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
122	case 1:
123	case 2:
124	$info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
125	break;
126	}
127	if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
128	switch ($info['audio']['dataformat']) {
129	case 'mp1':
130	case 'mp2':
131	case 'mp3':
132	$info['fileformat'] = $info['audio']['dataformat'];
133	break;
134
135	default:
136	$info['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"';
137	break;
138	}
139	}
140
141	if (empty($info['fileformat'])) {
142	unset($info['fileformat']);
143	unset($info['audio']['bitrate_mode']);
144	unset($info['avdataoffset']);
145	unset($info['avdataend']);
146	return false;
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'] = $this->GuessEncoderOptions();
158
159	return true;
160	}
161
162
163	public function GuessEncoderOptions() {
164	// shortcuts
165	$info = &$this->getid3->info;
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 $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
175
176	if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($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'], $NamedPresetBitrates))) {
181
182	$encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
183
184	} elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
185
186	static $KnownEncoderValues = array();
187	if (empty($KnownEncoderValues)) {
188
189	//$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
190	$KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
191	$KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
192	$KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
193	$KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
194	$KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
195	$KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
196	$KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
197	$KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
198	$KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
199	$KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
200	$KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
201	$KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
202	$KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
203	$KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
204	$KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
205	$KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
206	$KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
207
208	$KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
209	$KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
210	$KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
211	$KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
212	$KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
213	$KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
214	$KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
215	$KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
216	$KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
217	$KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
218	$KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
219	$KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
220	$KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
221	$KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
222	$KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
223	$KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
224	$KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
225	$KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
226	$KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
227	$KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
228	$KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
229	$KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
230	$KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
231	$KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
232	$KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
233	$KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
234	$KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
235	$KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
236	$KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
237	$KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
238	$KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
239	$KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
240	$KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
241	}
242
243	if (isset($KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$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 = $KnownEncoderValues[$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($KnownEncoderValues['**'][$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 = $KnownEncoderValues['**'][$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 (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) \|\| !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
289	$encoder_options .= ' --nogap';
290	}
291
292	if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
293	$ExplodedOptions = explode(' ', $encoder_options, 4);
294	if ($ExplodedOptions[0] == '--r3mix') {
295	$ExplodedOptions[1] = 'r3mix';
296	}
297	switch ($ExplodedOptions[0]) {
298	case '--preset':
299	case '--alt-preset':
300	case '--r3mix':
301	if ($ExplodedOptions[1] == 'fast') {
302	$ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
303	}
304	switch ($ExplodedOptions[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 $ExpectedLowpass = array(
317	'insane\|20500' => 20500,
318	'insane\|20600' => 20600, // 3.90.2, 3.90.3, 3.91
319	'medium\|18000' => 18000,
320	'fast medium\|18000' => 18000,
321	'extreme\|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
322	'extreme\|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
323	'fast extreme\|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
324	'fast extreme\|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
325	'standard\|19000' => 19000,
326	'fast standard\|19000' => 19000,
327	'r3mix\|19500' => 19500, // 3.90, 3.90.1, 3.92
328	'r3mix\|19600' => 19600, // 3.90.2, 3.90.3, 3.91
329	'r3mix\|18000' => 18000, // 3.94, 3.95
330	);
331	if (!isset($ExpectedLowpass[$ExplodedOptions[1].'\|'.$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	$ExplodedOptions = explode(' ', $encoder_options, 4);
357	switch ($ExplodedOptions[0]) {
358	case '--preset':
359	case '--alt-preset':
360	switch ($ExplodedOptions[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 $ExpectedResampledRate = array(
372	'phon+/lw/mw-eu/sw\|16000' => 16000,
373	'mw-us\|24000' => 24000, // 3.95
374	'mw-us\|32000' => 32000, // 3.93
375	'mw-us\|16000' => 16000, // 3.92
376	'phone\|16000' => 16000,
377	'phone\|11025' => 11025, // 3.94a15
378	'radio\|32000' => 32000, // 3.94a15
379	'fm/radio\|32000' => 32000, // 3.92
380	'fm\|32000' => 32000, // 3.90
381	'voice\|32000' => 32000);
382	if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'\|'.$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 $encoder_options;
404	}
405
406
407	public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
408	static $MPEGaudioVersionLookup;
409	static $MPEGaudioLayerLookup;
410	static $MPEGaudioBitrateLookup;
411	static $MPEGaudioFrequencyLookup;
412	static $MPEGaudioChannelModeLookup;
413	static $MPEGaudioModeExtensionLookup;
414	static $MPEGaudioEmphasisLookup;
415	if (empty($MPEGaudioVersionLookup)) {
416	$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
417	$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
418	$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
419	$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
420	$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
421	$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
422	$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
423	}
424
425	if (fseek($this->getid3->fp, $offset, SEEK_SET) != 0) {
426	$info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at '.$offset;
427	return false;
428	}
429	//$headerstring = fread($this->getid3->fp, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
430	$headerstring = fread($this->getid3->fp, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
431
432	// MP3 audio frame structure:
433	// $aa $aa $aa $aa [$bb $bb] $cc...
434	// where $aa..$aa is the four-byte mpeg-audio header (below)
435	// $bb $bb is the optional 2-byte CRC
436	// and $cc... is the audio data
437
438	$head4 = substr($headerstring, 0, 4);
439
440	static $MPEGaudioHeaderDecodeCache = array();
441	if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
442	$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
443	} else {
444	$MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
445	$MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
446	}
447
448	static $MPEGaudioHeaderValidCache = array();
449	if (!isset($MPEGaudioHeaderValidCache[$head4])) { // Not in cache
450	//$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
451	$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
452	}
453
454	// shortcut
455	if (!isset($info['mpeg']['audio'])) {
456	$info['mpeg']['audio'] = array();
457	}
458	$thisfile_mpeg_audio = &$info['mpeg']['audio'];
459
460
461	if ($MPEGaudioHeaderValidCache[$head4]) {
462	$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
463	} else {
464	$info['error'][] = 'Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset;
465	return false;
466	}
467
468	if (!$FastMPEGheaderScan) {
469	$thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
470	$thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
471
472	$thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
473	$thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
474	$thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
475	$thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
476	$thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
477	$thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
478	$thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
479	$thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
480	$thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
481
482	$info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
483	$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
484
485	if ($thisfile_mpeg_audio['protection']) {
486	$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
487	}
488	}
489
490	if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
491	// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
492	$info['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1';
493	$thisfile_mpeg_audio['raw']['bitrate'] = 0;
494	}
495	$thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
496	$thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
497
498	if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
499	// only skip multiple frame check if free-format bitstream found at beginning of file
500	// otherwise is quite possibly simply corrupted data
501	$recursivesearch = false;
502	}
503
504	// For Layer 2 there are some combinations of bitrate and mode which are not allowed.
505	if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
506
507	$info['audio']['dataformat'] = 'mp2';
508	switch ($thisfile_mpeg_audio['channelmode']) {
509
510	case 'mono':
511	if (($thisfile_mpeg_audio['bitrate'] == 'free') \|\| ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
512	// these are ok
513	} else {
514	$info['error'][] = $thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
515	return false;
516	}
517	break;
518
519	case 'stereo':
520	case 'joint stereo':
521	case 'dual channel':
522	if (($thisfile_mpeg_audio['bitrate'] == 'free') \|\| ($thisfile_mpeg_audio['bitrate'] == 64000) \|\| ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
523	// these are ok
524	} else {
525	$info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
526	return false;
527	}
528	break;
529
530	}
531
532	}
533
534
535	if ($info['audio']['sample_rate'] > 0) {
536	$thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
537	}
538
539	$nextframetestoffset = $offset + 1;
540	if ($thisfile_mpeg_audio['bitrate'] != 'free') {
541
542	$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
543
544	if (isset($thisfile_mpeg_audio['framelength'])) {
545	$nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
546	} else {
547	$info['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.';
548	return false;
549	}
550
551	}
552
553	$ExpectedNumberOfAudioBytes = 0;
554
555	////////////////////////////////////////////////////////////////////////////////////
556	// Variable-bitrate headers
557
558	if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
559	// Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
560	// specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
561
562	$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
563	$thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
564	$info['audio']['codec'] = 'Fraunhofer';
565
566	$SideInfoData = substr($headerstring, 4 + 2, 32);
567
568	$FraunhoferVBROffset = 36;
569
570	$thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion
571	$thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay
572	$thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality
573	$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
574	$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
575	$thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
576	$thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
577	$thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
578	$thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames
579
580	$ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
581
582	$previousbyteoffset = $offset;
583	for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
584	$Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
585	$FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
586	$thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
587	$thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
588	$previousbyteoffset += $Fraunhofer_OffsetN;
589	}
590
591
592	} else {
593
594	// Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
595	// depending on MPEG layer and number of channels
596
597	$VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
598	$SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
599
600	if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') \|\| (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
601	// 'Xing' is traditional Xing VBR frame
602	// 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
603	// 'Info' can legally be used to specify a VBR file as well, however.
604
605	// http://www.multiweb.cz/twoinches/MP3inside.htm
606	//00..03 = "Xing" or "Info"
607	//04..07 = Flags:
608	// 0x01 Frames Flag set if value for number of frames in file is stored
609	// 0x02 Bytes Flag set if value for filesize in bytes is stored
610	// 0x04 TOC Flag set if values for TOC are stored
611	// 0x08 VBR Scale Flag set if values for VBR scale is stored
612	//08..11 Frames: Number of frames in file (including the first Xing/Info one)
613	//12..15 Bytes: File length in Bytes
614	//16..115 TOC (Table of Contents):
615	// Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
616	// Each Byte has a value according this formula:
617	// (TOC[i] / 256) * fileLenInBytes
618	// So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
619	// TOC[(60/240)*100] = TOC[25]
620	// and corresponding Byte in file is then approximately at:
621	// (TOC[25]/256) * 5000000
622	//116..119 VBR Scale
623
624
625	// should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
626	// if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
627	$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
628	$thisfile_mpeg_audio['VBR_method'] = 'Xing';
629	// } else {
630	// $ScanAsCBR = true;
631	// $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
632	// }
633
634	$thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
635
636	$thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
637	$thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
638	$thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
639	$thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
640
641	if ($thisfile_mpeg_audio['xing_flags']['frames']) {
642	$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4));
643	//$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
644	}
645	if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
646	$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
647	}
648
649	//if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
650	if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
651
652	$framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];
653
654	if ($thisfile_mpeg_audio['layer'] == '1') {
655	// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
656	//$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
657	$info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
658	} else {
659	// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
660	//$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
661	$info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
662	}
663	$thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
664	}
665
666	if ($thisfile_mpeg_audio['xing_flags']['toc']) {
667	$LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
668	for ($i = 0; $i < 100; $i++) {
669	$thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i});
670	}
671	}
672	if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
673	$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
674	}
675
676
677	// http://gabriel.mp3-tech.org/mp3infotag.html
678	if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
679
680	// shortcut
681	$thisfile_mpeg_audio['LAME'] = array();
682	$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
683
684
685	$thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20);
686	$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
687
688	if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
689
690	// extra 11 chars are not part of version string when LAMEtag present
691	unset($thisfile_mpeg_audio_lame['long_version']);
692
693	// It the LAME tag was only introduced in LAME v3.90
694	// http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
695
696	// Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
697	// are assuming a 'Xing' identifier offset of 0x24, which is the case for
698	// MPEG-1 non-mono, but not for other combinations
699	$LAMEtagOffsetContant = $VBRidOffset - 0x24;
700
701	// shortcuts
702	$thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array());
703	$thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD'];
704	$thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
705	$thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
706	$thisfile_mpeg_audio_lame['raw'] = array();
707	$thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
708
709	// byte $9B VBR Quality
710	// This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
711	// Actually overwrites original Xing bytes
712	unset($thisfile_mpeg_audio['VBR_scale']);
713	$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
714
715	// bytes $9C-$A4 Encoder short VersionString
716	$thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
717
718	// byte $A5 Info Tag revision + VBR method
719	$LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
720
721	$thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
722	$thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
723	$thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
724	$thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
725
726	// byte $A6 Lowpass filter value
727	$thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
728
729	// bytes $A7-$AE Replay Gain
730	// http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
731	// bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
732	if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
733	// LAME 3.94a16 and later - 9.23 fixed point
734	// ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
735	$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
736	} else {
737	// LAME 3.94a15 and earlier - 32-bit floating point
738	// Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
739	$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
740	}
741	if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
742	unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
743	} else {
744	$thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
745	}
746
747	$thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
748	$thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
749
750
751	if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
752
753	$thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
754	$thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
755	$thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
756	$thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
757	$thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
758	$thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
759	$thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
760
761	if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
762	$info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
763	}
764	$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
765	$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
766	} else {
767	unset($thisfile_mpeg_audio_lame_RGAD['track']);
768	}
769	if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
770
771	$thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
772	$thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
773	$thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
774	$thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
775	$thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
776	$thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
777	$thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
778
779	if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
780	$info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
781	}
782	$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
783	$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
784	} else {
785	unset($thisfile_mpeg_audio_lame_RGAD['album']);
786	}
787	if (empty($thisfile_mpeg_audio_lame_RGAD)) {
788	unset($thisfile_mpeg_audio_lame['RGAD']);
789	}
790
791
792	// byte $AF Encoding flags + ATH Type
793	$EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
794	$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10);
795	$thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
796	$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40);
797	$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80);
798	$thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F;
799
800	// byte $B0 if ABR {specified bitrate} else {minimal bitrate}
801	$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
802	if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
803	$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
804	} elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
805	// ignore
806	} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
807	$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
808	}
809
810	// bytes $B1-$B3 Encoder delays
811	$EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
812	$thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
813	$thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF;
814
815	// byte $B4 Misc
816	$MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
817	$thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03);
818	$thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
819	$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
820	$thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
821	$thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
822	$thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
823	$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
824	$thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
825
826	// byte $B5 MP3 Gain
827	$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
828	$thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
829	$thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
830
831	// bytes $B6-$B7 Preset and surround info
832	$PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
833	// Reserved = ($PresetSurroundBytes & 0xC000);
834	$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
835	$thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
836	$thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
837	$thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
838	if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
839	$info['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org';
840	}
841	if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
842	// this may change if 3.90.4 ever comes out
843	$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
844	}
845
846	// bytes $B8-$BB MusicLength
847	$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
848	$ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
849
850	// bytes $BC-$BD MusicCRC
851	$thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
852
853	// bytes $BE-$BF CRC-16 of Info Tag
854	$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
855
856
857	// LAME CBR
858	if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
859
860	$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
861	$thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
862	$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
863	//if (empty($thisfile_mpeg_audio['bitrate']) \|\| (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
864	// $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
865	//}
866
867	}
868
869	}
870	}
871
872	} else {
873
874	// not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
875	$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
876	if ($recursivesearch) {
877	$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
878	if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
879	$recursivesearch = false;
880	$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
881	}
882	if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
883	$info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
884	}
885	}
886
887	}
888
889	}
890
891	if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
892	if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
893	if (isset($info['fileformat']) && ($info['fileformat'] == 'riff')) {
894	// ignore, audio data is broken into chunks so will always be data "missing"
895	} elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
896	$info['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)';
897	} else {
898	$info['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)';
899	}
900	} else {
901	if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
902	// $prenullbytefileoffset = ftell($this->getid3->fp);
903	// fseek($this->getid3->fp, $info['avdataend'], SEEK_SET);
904	// $PossibleNullByte = fread($this->getid3->fp, 1);
905	// fseek($this->getid3->fp, $prenullbytefileoffset, SEEK_SET);
906	// if ($PossibleNullByte === "\x00") {
907	$info['avdataend']--;
908	// $info['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored';
909	// } else {
910	// $info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
911	// }
912	} else {
913	$info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
914	}
915	}
916	}
917
918	if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
919	if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
920	$framebytelength = $this->FreeFormatFrameLength($offset, true);
921	if ($framebytelength > 0) {
922	$thisfile_mpeg_audio['framelength'] = $framebytelength;
923	if ($thisfile_mpeg_audio['layer'] == '1') {
924	// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
925	$info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
926	} else {
927	// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
928	$info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
929	}
930	} else {
931	$info['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
932	}
933	}
934	}
935
936	if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
937	switch ($thisfile_mpeg_audio['bitrate_mode']) {
938	case 'vbr':
939	case 'abr':
940	$bytes_per_frame = 1152;
941	if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
942	$bytes_per_frame = 384;
943	} elseif ((($thisfile_mpeg_audio['version'] == '2') \|\| ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
944	$bytes_per_frame = 576;
945	}
946	$thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
947	if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
948	$info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
949	$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
950	}
951	break;
952	}
953	}
954
955	// End variable-bitrate headers
956	////////////////////////////////////////////////////////////////////////////////////
957
958	if ($recursivesearch) {
959
960	if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
961	return false;
962	}
963
964	}
965
966
967	//if (false) {
968	// // experimental side info parsing section - not returning anything useful yet
969	//
970	// $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
971	// $SideInfoOffset = 0;
972	//
973	// if ($thisfile_mpeg_audio['version'] == '1') {
974	// if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
975	// // MPEG-1 (mono)
976	// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
977	// $SideInfoOffset += 9;
978	// $SideInfoOffset += 5;
979	// } else {
980	// // MPEG-1 (stereo, joint-stereo, dual-channel)
981	// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
982	// $SideInfoOffset += 9;
983	// $SideInfoOffset += 3;
984	// }
985	// } else { // 2 or 2.5
986	// if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
987	// // MPEG-2, MPEG-2.5 (mono)
988	// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
989	// $SideInfoOffset += 8;
990	// $SideInfoOffset += 1;
991	// } else {
992	// // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
993	// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
994	// $SideInfoOffset += 8;
995	// $SideInfoOffset += 2;
996	// }
997	// }
998	//
999	// if ($thisfile_mpeg_audio['version'] == '1') {
1000	// for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1001	// for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
1002	// $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1003	// $SideInfoOffset += 2;
1004	// }
1005	// }
1006	// }
1007	// for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
1008	// for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1009	// $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
1010	// $SideInfoOffset += 12;
1011	// $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1012	// $SideInfoOffset += 9;
1013	// $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1014	// $SideInfoOffset += 8;
1015	// if ($thisfile_mpeg_audio['version'] == '1') {
1016	// $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1017	// $SideInfoOffset += 4;
1018	// } else {
1019	// $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1020	// $SideInfoOffset += 9;
1021	// }
1022	// $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1023	// $SideInfoOffset += 1;
1024	//
1025	// if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
1026	//
1027	// $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
1028	// $SideInfoOffset += 2;
1029	// $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1030	// $SideInfoOffset += 1;
1031	//
1032	// for ($region = 0; $region < 2; $region++) {
1033	// $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1034	// $SideInfoOffset += 5;
1035	// }
1036	// $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
1037	//
1038	// for ($window = 0; $window < 3; $window++) {
1039	// $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1040	// $SideInfoOffset += 3;
1041	// }
1042	//
1043	// } else {
1044	//
1045	// for ($region = 0; $region < 3; $region++) {
1046	// $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1047	// $SideInfoOffset += 5;
1048	// }
1049	//
1050	// $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1051	// $SideInfoOffset += 4;
1052	// $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1053	// $SideInfoOffset += 3;
1054	// $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
1055	// }
1056	//
1057	// if ($thisfile_mpeg_audio['version'] == '1') {
1058	// $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1059	// $SideInfoOffset += 1;
1060	// }
1061	// $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1062	// $SideInfoOffset += 1;
1063	// $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1064	// $SideInfoOffset += 1;
1065	// }
1066	// }
1067	//}
1068
1069	return true;
1070	}
1071
1072	public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) {
1073	$info = &$this->getid3->info;
1074	$firstframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1075	$this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
1076
1077	for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
1078	// check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
1079	if (($nextframetestoffset + 4) >= $info['avdataend']) {
1080	// end of file
1081	return true;
1082	}
1083
1084	$nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1085	if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
1086	if ($ScanAsCBR) {
1087	// force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
1088	if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) \|\| !isset($firstframetestarray['mpeg']['audio']['bitrate']) \|\| ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
1089	return false;
1090	}
1091	}
1092
1093
1094	// next frame is OK, get ready to check the one after that
1095	if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1096	$nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
1097	} else {
1098	$info['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
1099	return false;
1100	}
1101
1102	} elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
1103
1104	// it's not the end of the file, but there's not enough data left for another frame, so assume it's garbage/padding and return OK
1105	return true;
1106
1107	} else {
1108
1109	// next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
1110	$info['warning'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';
1111
1112	return false;
1113	}
1114	}
1115	return true;
1116	}
1117
1118	public function FreeFormatFrameLength($offset, $deepscan=false) {
1119	$info = &$this->getid3->info;
1120
1121	fseek($this->getid3->fp, $offset, SEEK_SET);
1122	$MPEGaudioData = fread($this->getid3->fp, 32768);
1123
1124	$SyncPattern1 = substr($MPEGaudioData, 0, 4);
1125	// may be different pattern due to padding
1126	$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) \| 0x02).$SyncPattern1{3};
1127	if ($SyncPattern2 === $SyncPattern1) {
1128	$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3};
1129	}
1130
1131	$framelength = false;
1132	$framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1133	$framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1134	if ($framelength1 > 4) {
1135	$framelength = $framelength1;
1136	}
1137	if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1138	$framelength = $framelength2;
1139	}
1140	if (!$framelength) {
1141
1142	// LAME 3.88 has a different value for modeextension on the first frame vs the rest
1143	$framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
1144	$framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
1145
1146	if ($framelength1 > 4) {
1147	$framelength = $framelength1;
1148	}
1149	if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1150	$framelength = $framelength2;
1151	}
1152	if (!$framelength) {
1153	$info['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
1154	return false;
1155	} else {
1156	$info['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
1157	$info['audio']['codec'] = 'LAME';
1158	$info['audio']['encoder'] = 'LAME3.88';
1159	$SyncPattern1 = substr($SyncPattern1, 0, 3);
1160	$SyncPattern2 = substr($SyncPattern2, 0, 3);
1161	}
1162	}
1163
1164	if ($deepscan) {
1165
1166	$ActualFrameLengthValues = array();
1167	$nextoffset = $offset + $framelength;
1168	while ($nextoffset < ($info['avdataend'] - 6)) {
1169	fseek($this->getid3->fp, $nextoffset - 1, SEEK_SET);
1170	$NextSyncPattern = fread($this->getid3->fp, 6);
1171	if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) \|\| (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
1172	// good - found where expected
1173	$ActualFrameLengthValues[] = $framelength;
1174	} elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) \|\| (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
1175	// ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1176	$ActualFrameLengthValues[] = ($framelength - 1);
1177	$nextoffset--;
1178	} elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) \|\| (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
1179	// ok - found one byte later than expected (last frame was padded, first frame wasn't)
1180	$ActualFrameLengthValues[] = ($framelength + 1);
1181	$nextoffset++;
1182	} else {
1183	$info['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
1184	return false;
1185	}
1186	$nextoffset += $framelength;
1187	}
1188	if (count($ActualFrameLengthValues) > 0) {
1189	$framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1190	}
1191	}
1192	return $framelength;
1193	}
1194
1195	public function getOnlyMPEGaudioInfoBruteForce() {
1196	$MPEGaudioHeaderDecodeCache = array();
1197	$MPEGaudioHeaderValidCache = array();
1198	$MPEGaudioHeaderLengthCache = array();
1199	$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1200	$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1201	$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1202	$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1203	$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1204	$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1205	$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1206	$LongMPEGversionLookup = array();
1207	$LongMPEGlayerLookup = array();
1208	$LongMPEGbitrateLookup = array();
1209	$LongMPEGpaddingLookup = array();
1210	$LongMPEGfrequencyLookup = array();
1211	$Distribution['bitrate'] = array();
1212	$Distribution['frequency'] = array();
1213	$Distribution['layer'] = array();
1214	$Distribution['version'] = array();
1215	$Distribution['padding'] = array();
1216
1217	$info = &$this->getid3->info;
1218	fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
1219
1220	$max_frames_scan = 5000;
1221	$frames_scanned = 0;
1222
1223	$previousvalidframe = $info['avdataoffset'];
1224	while (ftell($this->getid3->fp) < $info['avdataend']) {
1225	set_time_limit(30);
1226	$head4 = fread($this->getid3->fp, 4);
1227	if (strlen($head4) < 4) {
1228	break;
1229	}
1230	if ($head4{0} != "\xFF") {
1231	for ($i = 1; $i < 4; $i++) {
1232	if ($head4{$i} == "\xFF") {
1233	fseek($this->getid3->fp, $i - 4, SEEK_CUR);
1234	continue 2;
1235	}
1236	}
1237	continue;
1238	}
1239	if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1240	$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
1241	}
1242	if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1243	$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
1244	}
1245	if ($MPEGaudioHeaderValidCache[$head4]) {
1246
1247	if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
1248	$LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
1249	$LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
1250	$LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
1251	$LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
1252	$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
1253	$MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
1254	$LongMPEGbitrateLookup[$head4],
1255	$LongMPEGversionLookup[$head4],
1256	$LongMPEGlayerLookup[$head4],
1257	$LongMPEGpaddingLookup[$head4],
1258	$LongMPEGfrequencyLookup[$head4]);
1259	}
1260	if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
1261	$WhereWeWere = ftell($this->getid3->fp);
1262	fseek($this->getid3->fp, $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
1263	$next4 = fread($this->getid3->fp, 4);
1264	if ($next4{0} == "\xFF") {
1265	if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
1266	$MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
1267	}
1268	if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1269	$MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
1270	}
1271	if ($MPEGaudioHeaderValidCache[$next4]) {
1272	fseek($this->getid3->fp, -4, SEEK_CUR);
1273
1274	getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]);
1275	getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]);
1276	getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]);
1277	getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]);
1278	getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]);
1279	if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
1280	$pct_data_scanned = (ftell($this->getid3->fp) - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
1281	$info['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
1282	foreach ($Distribution as $key1 => $value1) {
1283	foreach ($value1 as $key2 => $value2) {
1284	$Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
1285	}
1286	}
1287	break;
1288	}
1289	continue;
1290	}
1291	}
1292	unset($next4);
1293	fseek($this->getid3->fp, $WhereWeWere - 3, SEEK_SET);
1294	}
1295
1296	}
1297	}
1298	foreach ($Distribution as $key => $value) {
1299	ksort($Distribution[$key], SORT_NUMERIC);
1300	}
1301	ksort($Distribution['version'], SORT_STRING);
1302	$info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
1303	$info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
1304	$info['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
1305	$info['mpeg']['audio']['version_distribution'] = $Distribution['version'];
1306	$info['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
1307	if (count($Distribution['version']) > 1) {
1308	$info['error'][] = 'Corrupt file - more than one MPEG version detected';
1309	}
1310	if (count($Distribution['layer']) > 1) {
1311	$info['error'][] = 'Corrupt file - more than one MPEG layer detected';
1312	}
1313	if (count($Distribution['frequency']) > 1) {
1314	$info['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
1315	}
1316
1317
1318	$bittotal = 0;
1319	foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1320	if ($bitratevalue != 'free') {
1321	$bittotal += ($bitratevalue * $bitratecount);
1322	}
1323	}
1324	$info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
1325	if ($info['mpeg']['audio']['frame_count'] == 0) {
1326	$info['error'][] = 'no MPEG audio frames found';
1327	return false;
1328	}
1329	$info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']);
1330	$info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
1331	$info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
1332
1333	$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1334	$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1335	$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1336	$info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
1337	$info['fileformat'] = $info['audio']['dataformat'];
1338
1339	return true;
1340	}
1341
1342
1343	public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) {
1344	// looks for synch, decodes MPEG audio header
1345
1346	$info = &$this->getid3->info;
1347
1348	static $MPEGaudioVersionLookup;
1349	static $MPEGaudioLayerLookup;
1350	static $MPEGaudioBitrateLookup;
1351	if (empty($MPEGaudioVersionLookup)) {
1352	$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1353	$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1354	$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1355
1356	}
1357
1358	fseek($this->getid3->fp, $avdataoffset, SEEK_SET);
1359	$sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset);
1360	if ($sync_seek_buffer_size <= 0) {
1361	$info['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset;
1362	return false;
1363	}
1364	$header = fread($this->getid3->fp, $sync_seek_buffer_size);
1365	$sync_seek_buffer_size = strlen($header);
1366	$SynchSeekOffset = 0;
1367	while ($SynchSeekOffset < $sync_seek_buffer_size) {
1368	if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) {
1369
1370	if ($SynchSeekOffset > $sync_seek_buffer_size) {
1371	// if a synch's not found within the first 128k bytes, then give up
1372	$info['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB';
1373	if (isset($info['audio']['bitrate'])) {
1374	unset($info['audio']['bitrate']);
1375	}
1376	if (isset($info['mpeg']['audio'])) {
1377	unset($info['mpeg']['audio']);
1378	}
1379	if (empty($info['mpeg'])) {
1380	unset($info['mpeg']);
1381	}
1382	return false;
1383
1384	} elseif (feof($this->getid3->fp)) {
1385
1386	$info['error'][] = 'Could not find valid MPEG audio synch before end of file';
1387	if (isset($info['audio']['bitrate'])) {
1388	unset($info['audio']['bitrate']);
1389	}
1390	if (isset($info['mpeg']['audio'])) {
1391	unset($info['mpeg']['audio']);
1392	}
1393	if (isset($info['mpeg']) && (!is_array($info['mpeg']) \|\| (count($info['mpeg']) == 0))) {
1394	unset($info['mpeg']);
1395	}
1396	return false;
1397	}
1398	}
1399
1400	if (($SynchSeekOffset + 1) >= strlen($header)) {
1401	$info['error'][] = 'Could not find valid MPEG synch before end of file';
1402	return false;
1403	}
1404
1405	if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected
1406	if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
1407	$FirstFrameThisfileInfo = $info;
1408	$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
1409	if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) {
1410	// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1411	// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1412	unset($FirstFrameThisfileInfo);
1413	}
1414	}
1415
1416	$dummy = $info; // only overwrite real data if valid header found
1417	if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
1418	$info = $dummy;
1419	$info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1420	switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
1421	case '':
1422	case 'id3':
1423	case 'ape':
1424	case 'mp3':
1425	$info['fileformat'] = 'mp3';
1426	$info['audio']['dataformat'] = 'mp3';
1427	break;
1428	}
1429	if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1430	if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
1431	// If there is garbage data between a valid VBR header frame and a sequence
1432	// of valid MPEG-audio frames the VBR data is no longer discarded.
1433	$info = $FirstFrameThisfileInfo;
1434	$info['avdataoffset'] = $FirstFrameAVDataOffset;
1435	$info['fileformat'] = 'mp3';
1436	$info['audio']['dataformat'] = 'mp3';
1437	$dummy = $info;
1438	unset($dummy['mpeg']['audio']);
1439	$GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1440	$GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
1441	if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) {
1442	$info = $dummy;
1443	$info['avdataoffset'] = $GarbageOffsetEnd;
1444	$info['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
1445	} else {
1446	$info['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
1447	}
1448	}
1449	}
1450	if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
1451	// VBR file with no VBR header
1452	$BitrateHistogram = true;
1453	}
1454
1455	if ($BitrateHistogram) {
1456
1457	$info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1458	$info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
1459
1460	if ($info['mpeg']['audio']['version'] == '1') {
1461	if ($info['mpeg']['audio']['layer'] == 3) {
1462	$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
1463	} elseif ($info['mpeg']['audio']['layer'] == 2) {
1464	$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
1465	} elseif ($info['mpeg']['audio']['layer'] == 1) {
1466	$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1467	}
1468	} elseif ($info['mpeg']['audio']['layer'] == 1) {
1469	$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);
1470	} else {
1471	$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);
1472	}
1473
1474	$dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1475	$synchstartoffset = $info['avdataoffset'];
1476	fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
1477
1478	// you can play with these numbers:
1479	$max_frames_scan = 50000;
1480	$max_scan_segments = 10;
1481
1482	// don't play with these numbers:
1483	$FastMode = false;
1484	$SynchErrorsFound = 0;
1485	$frames_scanned = 0;
1486	$this_scan_segment = 0;
1487	$frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
1488	$pct_data_scanned = 0;
1489	for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
1490	$frames_scanned_this_segment = 0;
1491	if (ftell($this->getid3->fp) >= $info['avdataend']) {
1492	break;
1493	}
1494	$scan_start_offset[$current_segment] = max(ftell($this->getid3->fp), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
1495	if ($current_segment > 0) {
1496	fseek($this->getid3->fp, $scan_start_offset[$current_segment], SEEK_SET);
1497	$buffer_4k = fread($this->getid3->fp, 4096);
1498	for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
1499	if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected
1500	if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
1501	$calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
1502	if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) {
1503	$scan_start_offset[$current_segment] += $j;
1504	break;
1505	}
1506	}
1507	}
1508	}
1509	}
1510	$synchstartoffset = $scan_start_offset[$current_segment];
1511	while ($this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) {
1512	$FastMode = true;
1513	$thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1514
1515	if (empty($dummy['mpeg']['audio']['framelength'])) {
1516	$SynchErrorsFound++;
1517	$synchstartoffset++;
1518	} else {
1519	getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
1520	getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
1521	getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
1522	$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
1523	}
1524	$frames_scanned++;
1525	if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
1526	$this_pct_scanned = (ftell($this->getid3->fp) - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']);
1527	if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
1528	// file likely contains < $max_frames_scan, just scan as one segment
1529	$max_scan_segments = 1;
1530	$frames_scan_per_segment = $max_frames_scan;
1531	} else {
1532	$pct_data_scanned += $this_pct_scanned;
1533	break;
1534	}
1535	}
1536	}
1537	}
1538	if ($pct_data_scanned > 0) {
1539	$info['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
1540	foreach ($info['mpeg']['audio'] as $key1 => $value1) {
1541	if (!preg_match('#_distribution$#i', $key1)) {
1542	continue;
1543	}
1544	foreach ($value1 as $key2 => $value2) {
1545	$info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
1546	}
1547	}
1548	}
1549
1550	if ($SynchErrorsFound > 0) {
1551	$info['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
1552	//return false;
1553	}
1554
1555	$bittotal = 0;
1556	$framecounter = 0;
1557	foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1558	$framecounter += $bitratecount;
1559	if ($bitratevalue != 'free') {
1560	$bittotal += ($bitratevalue * $bitratecount);
1561	}
1562	}
1563	if ($framecounter == 0) {
1564	$info['error'][] = 'Corrupt MP3 file: framecounter == zero';
1565	return false;
1566	}
1567	$info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
1568	$info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
1569
1570	$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1571
1572
1573	// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1574	$distinct_bitrates = 0;
1575	foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
1576	if ($bitrate_count > 0) {
1577	$distinct_bitrates++;
1578	}
1579	}
1580	if ($distinct_bitrates > 1) {
1581	$info['mpeg']['audio']['bitrate_mode'] = 'vbr';
1582	} else {
1583	$info['mpeg']['audio']['bitrate_mode'] = 'cbr';
1584	}
1585	$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1586
1587	}
1588
1589	break; // exit while()
1590	}
1591	}
1592
1593	$SynchSeekOffset++;
1594	if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
1595	// end of file/data
1596
1597	if (empty($info['mpeg']['audio'])) {
1598
1599	$info['error'][] = 'could not find valid MPEG synch before end of file';
1600	if (isset($info['audio']['bitrate'])) {
1601	unset($info['audio']['bitrate']);
1602	}
1603	if (isset($info['mpeg']['audio'])) {
1604	unset($info['mpeg']['audio']);
1605	}
1606	if (isset($info['mpeg']) && (!is_array($info['mpeg']) \|\| empty($info['mpeg']))) {
1607	unset($info['mpeg']);
1608	}
1609	return false;
1610
1611	}
1612	break;
1613	}
1614
1615	}
1616	$info['audio']['channels'] = $info['mpeg']['audio']['channels'];
1617	$info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
1618	$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1619	return true;
1620	}
1621
1622
1623	public static function MPEGaudioVersionArray() {
1624	static $MPEGaudioVersion = array('2.5', false, '2', '1');
1625	return $MPEGaudioVersion;
1626	}
1627
1628	public static function MPEGaudioLayerArray() {
1629	static $MPEGaudioLayer = array(false, 3, 2, 1);
1630	return $MPEGaudioLayer;
1631	}
1632
1633	public static function MPEGaudioBitrateArray() {
1634	static $MPEGaudioBitrate;
1635	if (empty($MPEGaudioBitrate)) {
1636	$MPEGaudioBitrate = array (
1637	'1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1638	2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1639	3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1640	),
1641
1642	'2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1643	2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
1644	)
1645	);
1646	$MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1647	$MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
1648	}
1649	return $MPEGaudioBitrate;
1650	}
1651
1652	public static function MPEGaudioFrequencyArray() {
1653	static $MPEGaudioFrequency;
1654	if (empty($MPEGaudioFrequency)) {
1655	$MPEGaudioFrequency = array (
1656	'1' => array(44100, 48000, 32000),
1657	'2' => array(22050, 24000, 16000),
1658	'2.5' => array(11025, 12000, 8000)
1659	);
1660	}
1661	return $MPEGaudioFrequency;
1662	}
1663
1664	public static function MPEGaudioChannelModeArray() {
1665	static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1666	return $MPEGaudioChannelMode;
1667	}
1668
1669	public static function MPEGaudioModeExtensionArray() {
1670	static $MPEGaudioModeExtension;
1671	if (empty($MPEGaudioModeExtension)) {
1672	$MPEGaudioModeExtension = array (
1673	1 => array('4-31', '8-31', '12-31', '16-31'),
1674	2 => array('4-31', '8-31', '12-31', '16-31'),
1675	3 => array('', 'IS', 'MS', 'IS+MS')
1676	);
1677	}
1678	return $MPEGaudioModeExtension;
1679	}
1680
1681	public static function MPEGaudioEmphasisArray() {
1682	static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1683	return $MPEGaudioEmphasis;
1684	}
1685
1686	public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
1687	return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
1688	}
1689
1690	public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
1691	if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
1692	return false;
1693	}
1694
1695	static $MPEGaudioVersionLookup;
1696	static $MPEGaudioLayerLookup;
1697	static $MPEGaudioBitrateLookup;
1698	static $MPEGaudioFrequencyLookup;
1699	static $MPEGaudioChannelModeLookup;
1700	static $MPEGaudioModeExtensionLookup;
1701	static $MPEGaudioEmphasisLookup;
1702	if (empty($MPEGaudioVersionLookup)) {
1703	$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1704	$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1705	$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1706	$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1707	$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1708	$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1709	$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1710	}
1711
1712	if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1713	$decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1714	} else {
1715	echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
1716	return false;
1717	}
1718	if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1719	$decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1720	} else {
1721	echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
1722	return false;
1723	}
1724	if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
1725	echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
1726	if ($rawarray['bitrate'] == 15) {
1727	// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1728	// let it go through here otherwise file will not be identified
1729	if (!$allowBitrate15) {
1730	return false;
1731	}
1732	} else {
1733	return false;
1734	}
1735	}
1736	if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
1737	echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
1738	return false;
1739	}
1740	if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
1741	echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
1742	return false;
1743	}
1744	if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
1745	echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
1746	return false;
1747	}
1748	if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
1749	echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
1750	return false;
1751	}
1752	// These are just either set or not set, you can't mess that up :)
1753	// $rawarray['protection'];
1754	// $rawarray['padding'];
1755	// $rawarray['private'];
1756	// $rawarray['copyright'];
1757	// $rawarray['original'];
1758
1759	return true;
1760	}
1761
1762	public static function MPEGaudioHeaderDecode($Header4Bytes) {
1763	// AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
1764	// A - Frame sync (all bits set)
1765	// B - MPEG Audio version ID
1766	// C - Layer description
1767	// D - Protection bit
1768	// E - Bitrate index
1769	// F - Sampling rate frequency index
1770	// G - Padding bit
1771	// H - Private bit
1772	// I - Channel Mode
1773	// J - Mode extension (Only if Joint stereo)
1774	// K - Copyright
1775	// L - Original
1776	// M - Emphasis
1777
1778	if (strlen($Header4Bytes) != 4) {
1779	return false;
1780	}
1781
1782	$MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
1783	$MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB
1784	$MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC
1785	$MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D
1786	$MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE
1787	$MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF
1788	$MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G
1789	$MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H
1790	$MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II
1791	$MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ
1792	$MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K
1793	$MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L
1794	$MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM
1795
1796	return $MPEGrawHeader;
1797	}
1798
1799	public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) {
1800	static $AudioFrameLengthCache = array();
1801
1802	if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
1803	$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
1804	if ($bitrate != 'free') {
1805
1806	if ($version == '1') {
1807
1808	if ($layer == '1') {
1809
1810	// For Layer I slot is 32 bits long
1811	$FrameLengthCoefficient = 48;
1812	$SlotLength = 4;
1813
1814	} else { // Layer 2 / 3
1815
1816	// for Layer 2 and Layer 3 slot is 8 bits long.
1817	$FrameLengthCoefficient = 144;
1818	$SlotLength = 1;
1819
1820	}
1821
1822	} else { // MPEG-2 / MPEG-2.5
1823
1824	if ($layer == '1') {
1825
1826	// For Layer I slot is 32 bits long
1827	$FrameLengthCoefficient = 24;
1828	$SlotLength = 4;
1829
1830	} elseif ($layer == '2') {
1831
1832	// for Layer 2 and Layer 3 slot is 8 bits long.
1833	$FrameLengthCoefficient = 144;
1834	$SlotLength = 1;
1835
1836	} else { // layer 3
1837
1838	// for Layer 2 and Layer 3 slot is 8 bits long.
1839	$FrameLengthCoefficient = 72;
1840	$SlotLength = 1;
1841
1842	}
1843
1844	}
1845
1846	// FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
1847	if ($samplerate > 0) {
1848	$NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
1849	$NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
1850	if ($padding) {
1851	$NewFramelength += $SlotLength;
1852	}
1853	$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
1854	}
1855	}
1856	}
1857	return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
1858	}
1859
1860	public static function ClosestStandardMP3Bitrate($bit_rate) {
1861	static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
1862	static $bit_rate_table = array (0=>'-');
1863	$round_bit_rate = intval(round($bit_rate, -3));
1864	if (!isset($bit_rate_table[$round_bit_rate])) {
1865	if ($round_bit_rate > max($standard_bit_rates)) {
1866	$bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate));
1867	} else {
1868	$bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
1869	foreach ($standard_bit_rates as $standard_bit_rate) {
1870	if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
1871	break;
1872	}
1873	$bit_rate_table[$round_bit_rate] = $standard_bit_rate;
1874	}
1875	}
1876	}
1877	return $bit_rate_table[$round_bit_rate];
1878	}
1879
1880	public static function XingVBRidOffset($version, $channelmode) {
1881	static $XingVBRidOffsetCache = array();
1882	if (empty($XingVBRidOffset)) {
1883	$XingVBRidOffset = array (
1884	'1' => array ('mono' => 0x15, // 4 + 17 = 21
1885	'stereo' => 0x24, // 4 + 32 = 36
1886	'joint stereo' => 0x24,
1887	'dual channel' => 0x24
1888	),
1889
1890	'2' => array ('mono' => 0x0D, // 4 + 9 = 13
1891	'stereo' => 0x15, // 4 + 17 = 21
1892	'joint stereo' => 0x15,
1893	'dual channel' => 0x15
1894	),
1895
1896	'2.5' => array ('mono' => 0x15,
1897	'stereo' => 0x15,
1898	'joint stereo' => 0x15,
1899	'dual channel' => 0x15
1900	)
1901	);
1902	}
1903	return $XingVBRidOffset[$version][$channelmode];
1904	}
1905
1906	public static function LAMEvbrMethodLookup($VBRmethodID) {
1907	static $LAMEvbrMethodLookup = array(
1908	0x00 => 'unknown',
1909	0x01 => 'cbr',
1910	0x02 => 'abr',
1911	0x03 => 'vbr-old / vbr-rh',
1912	0x04 => 'vbr-new / vbr-mtrh',
1913	0x05 => 'vbr-mt',
1914	0x06 => 'vbr (full vbr method 4)',
1915	0x08 => 'cbr (constant bitrate 2 pass)',
1916	0x09 => 'abr (2 pass)',
1917	0x0F => 'reserved'
1918	);
1919	return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
1920	}
1921
1922	public static function LAMEmiscStereoModeLookup($StereoModeID) {
1923	static $LAMEmiscStereoModeLookup = array(
1924	0 => 'mono',
1925	1 => 'stereo',
1926	2 => 'dual mono',
1927	3 => 'joint stereo',
1928	4 => 'forced stereo',
1929	5 => 'auto',
1930	6 => 'intensity stereo',
1931	7 => 'other'
1932	);
1933	return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
1934	}
1935
1936	public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
1937	static $LAMEmiscSourceSampleFrequencyLookup = array(
1938	0 => '<= 32 kHz',
1939	1 => '44.1 kHz',
1940	2 => '48 kHz',
1941	3 => '> 48kHz'
1942	);
1943	return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
1944	}
1945
1946	public static function LAMEsurroundInfoLookup($SurroundInfoID) {
1947	static $LAMEsurroundInfoLookup = array(
1948	0 => 'no surround info',
1949	1 => 'DPL encoding',
1950	2 => 'DPL2 encoding',
1951	3 => 'Ambisonic encoding'
1952	);
1953	return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
1954	}
1955
1956	public static function LAMEpresetUsedLookup($LAMEtag) {
1957
1958	if ($LAMEtag['preset_used_id'] == 0) {
1959	// no preset used (LAME >=3.93)
1960	// no preset recorded (LAME <3.93)
1961	return '';
1962	}
1963	$LAMEpresetUsedLookup = array();
1964
1965	///// THIS PART CANNOT BE STATIC .
1966	for ($i = 8; $i <= 320; $i++) {
1967	switch ($LAMEtag['vbr_method']) {
1968	case 'cbr':
1969	$LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
1970	break;
1971	case 'abr':
1972	default: // other VBR modes shouldn't be here(?)
1973	$LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
1974	break;
1975	}
1976	}
1977
1978	// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
1979
1980	// named alt-presets
1981	$LAMEpresetUsedLookup[1000] = '--r3mix';
1982	$LAMEpresetUsedLookup[1001] = '--alt-preset standard';
1983	$LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
1984	$LAMEpresetUsedLookup[1003] = '--alt-preset insane';
1985	$LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
1986	$LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
1987	$LAMEpresetUsedLookup[1006] = '--alt-preset medium';
1988	$LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
1989
1990	// LAME 3.94 additions/changes
1991	$LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
1992	$LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
1993
1994	$LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
1995	$LAMEpresetUsedLookup[410] = '-V9';
1996	$LAMEpresetUsedLookup[420] = '-V8';
1997	$LAMEpresetUsedLookup[440] = '-V6';
1998	$LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
1999	$LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
2000	$LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
2001	$LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
2002	$LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
2003	$LAMEpresetUsedLookup[490] = '-V1';
2004	$LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
2005
2006	return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
2007	}
2008
2009	}

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source: extensions/piwigo_videojs/include/getid3/module.audio.mp3.php @ 31945

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