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module.audio.mp3.php @ 12348

Last change on this file since 12348 was 3544, checked in by vdigital, 15 years ago
Change: getid3 upgraded to -> 1.7.9
Property svn:eol-style set to `LF` Property svn:keywords set to `Author Date Id Revision`
File size: 98.5 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
25	{
26
27	var $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files
28
29	function getid3_mp3(&$fd, &$ThisFileInfo) {
30
31	if (!$this->getOnlyMPEGaudioInfo($fd, $ThisFileInfo, $ThisFileInfo['avdataoffset'])) {
32	if ($this->allow_bruteforce) {
33	$ThisFileInfo['error'][] = 'Rescanning file in BruteForce mode';
34	$this->getOnlyMPEGaudioInfoBruteForce($fd, $ThisFileInfo);
35	}
36	}
37
38
39	if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode'])) {
40	$ThisFileInfo['audio']['bitrate_mode'] = strtolower($ThisFileInfo['mpeg']['audio']['bitrate_mode']);
41	}
42
43	if (((isset($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] > $ThisFileInfo['id3v2']['headerlength'])) \|\| (!isset($ThisFileInfo['id3v2']) && ($ThisFileInfo['avdataoffset'] > 0)))) {
44
45	$synchoffsetwarning = 'Unknown data before synch ';
46	if (isset($ThisFileInfo['id3v2']['headerlength'])) {
47	$synchoffsetwarning .= '(ID3v2 header ends at '.$ThisFileInfo['id3v2']['headerlength'].', then '.($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']).' bytes garbage, ';
48	} else {
49	$synchoffsetwarning .= '(should be at beginning of file, ';
50	}
51	$synchoffsetwarning .= 'synch detected at '.$ThisFileInfo['avdataoffset'].')';
52	if (@$ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
53
54	if (!empty($ThisFileInfo['id3v2']['headerlength']) && (($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']) == $ThisFileInfo['mpeg']['audio']['framelength'])) {
55
56	$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
57	$ThisFileInfo['audio']['codec'] = 'LAME';
58	$CurrentDataLAMEversionString = 'LAME3.';
59
60	} elseif (empty($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] == $ThisFileInfo['mpeg']['audio']['framelength'])) {
61
62	$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
63	$ThisFileInfo['audio']['codec'] = 'LAME';
64	$CurrentDataLAMEversionString = 'LAME3.';
65
66	}
67
68	}
69	$ThisFileInfo['warning'][] = $synchoffsetwarning;
70
71	}
72
73	if (isset($ThisFileInfo['mpeg']['audio']['LAME'])) {
74	$ThisFileInfo['audio']['codec'] = 'LAME';
75	if (!empty($ThisFileInfo['mpeg']['audio']['LAME']['long_version'])) {
76	$ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['long_version'], "\x00");
77	} elseif (!empty($ThisFileInfo['mpeg']['audio']['LAME']['short_version'])) {
78	$ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['short_version'], "\x00");
79	}
80	}
81
82	$CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : @$ThisFileInfo['audio']['encoder']);
83	if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
84	// a version number of LAME that does not end with a number like "LAME3.92"
85	// or with a closing parenthesis like "LAME3.88 (alpha)"
86	// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
87
88	// not sure what the actual last frame length will be, but will be less than or equal to 1441
89	$PossiblyLongerLAMEversion_FrameLength = 1441;
90
91	// Not sure what version of LAME this is - look in padding of last frame for longer version string
92	$PossibleLAMEversionStringOffset = $ThisFileInfo['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
93	fseek($fd, $PossibleLAMEversionStringOffset);
94	$PossiblyLongerLAMEversion_Data = fread($fd, $PossiblyLongerLAMEversion_FrameLength);
95	switch (substr($CurrentDataLAMEversionString, -1)) {
96	case 'a':
97	case 'b':
98	// "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
99	// need to trim off "a" to match longer string
100	$CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
101	break;
102	}
103	if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
104	if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
105	$PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
106	if (strlen($PossiblyLongerLAMEversion_NewString) > strlen(@$ThisFileInfo['audio']['encoder'])) {
107	$ThisFileInfo['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
108	}
109	}
110	}
111	}
112	if (!empty($ThisFileInfo['audio']['encoder'])) {
113	$ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['audio']['encoder'], "\x00 ");
114	}
115
116	switch (@$ThisFileInfo['mpeg']['audio']['layer']) {
117	case 1:
118	case 2:
119	$ThisFileInfo['audio']['dataformat'] = 'mp'.$ThisFileInfo['mpeg']['audio']['layer'];
120	break;
121	}
122	if (@$ThisFileInfo['fileformat'] == 'mp3') {
123	switch ($ThisFileInfo['audio']['dataformat']) {
124	case 'mp1':
125	case 'mp2':
126	case 'mp3':
127	$ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];
128	break;
129
130	default:
131	$ThisFileInfo['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$ThisFileInfo['audio']['dataformat'].'"';
132	break;
133	}
134	}
135
136	if (empty($ThisFileInfo['fileformat'])) {
137	unset($ThisFileInfo['fileformat']);
138	unset($ThisFileInfo['audio']['bitrate_mode']);
139	unset($ThisFileInfo['avdataoffset']);
140	unset($ThisFileInfo['avdataend']);
141	return false;
142	}
143
144	$ThisFileInfo['mime_type'] = 'audio/mpeg';
145	$ThisFileInfo['audio']['lossless'] = false;
146
147	// Calculate playtime
148	if (!isset($ThisFileInfo['playtime_seconds']) && isset($ThisFileInfo['audio']['bitrate']) && ($ThisFileInfo['audio']['bitrate'] > 0)) {
149	$ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['audio']['bitrate'];
150	}
151
152	$ThisFileInfo['audio']['encoder_options'] = $this->GuessEncoderOptions($ThisFileInfo);
153
154	return true;
155	}
156
157
158	function GuessEncoderOptions(&$ThisFileInfo) {
159	// shortcuts
160	if (!empty($ThisFileInfo['mpeg']['audio'])) {
161	$thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio'];
162	if (!empty($thisfile_mpeg_audio['LAME'])) {
163	$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
164	}
165	}
166
167	$encoder_options = '';
168	static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
169
170	if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
171
172	$encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
173
174	} elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) {
175
176	$encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
177
178	} elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
179
180	static $KnownEncoderValues = array();
181	if (empty($KnownEncoderValues)) {
182
183	//$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
184	$KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
185	$KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
186	$KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
187	$KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
188	$KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
189	$KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
190	$KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
191	$KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
192	$KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
193	$KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
194	$KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
195	$KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
196	$KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
197	$KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
198	$KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
199	$KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
200	$KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
201
202	$KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
203	$KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
204	$KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
205	$KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
206	$KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
207	$KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
208	$KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
209	$KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
210	$KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
211	$KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
212	$KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
213	$KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
214	$KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
215	$KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
216	$KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
217	$KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
218	$KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
219	$KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
220	$KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
221	$KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
222	$KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
223	$KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
224	$KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
225	$KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
226	$KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
227	$KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
228	$KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
229	$KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
230	$KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
231	$KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
232	$KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
233	$KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
234	$KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
235	}
236
237	if (isset($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']])) {
238
239	$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']];
240
241	} 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']])) {
242
243	$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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
244
245	} elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'vbr') {
246
247	// http://gabriel.mp3-tech.org/mp3infotag.html
248	// int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
249
250
251	$LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
252	$LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
253	$encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value;
254
255	} elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
256
257	$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
258
259	} else {
260
261	$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
262
263	}
264
265	} elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
266
267	$encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
268
269	} elseif (!empty($ThisFileInfo['audio']['bitrate'])) {
270
271	if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
272	$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
273	} else {
274	$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
275	}
276
277	}
278	if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
279	$encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
280	}
281
282	if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] \|\| @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) {
283	$encoder_options .= ' --nogap';
284	}
285
286	if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
287	$ExplodedOptions = explode(' ', $encoder_options, 4);
288	if ($ExplodedOptions[0] == '--r3mix') {
289	$ExplodedOptions[1] = 'r3mix';
290	}
291	switch ($ExplodedOptions[0]) {
292	case '--preset':
293	case '--alt-preset':
294	case '--r3mix':
295	if ($ExplodedOptions[1] == 'fast') {
296	$ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
297	}
298	switch ($ExplodedOptions[1]) {
299	case 'portable':
300	case 'medium':
301	case 'standard':
302	case 'extreme':
303	case 'insane':
304	case 'fast portable':
305	case 'fast medium':
306	case 'fast standard':
307	case 'fast extreme':
308	case 'fast insane':
309	case 'r3mix':
310	static $ExpectedLowpass = array(
311	'insane\|20500' => 20500,
312	'insane\|20600' => 20600, // 3.90.2, 3.90.3, 3.91
313	'medium\|18000' => 18000,
314	'fast medium\|18000' => 18000,
315	'extreme\|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
316	'extreme\|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
317	'fast extreme\|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
318	'fast extreme\|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
319	'standard\|19000' => 19000,
320	'fast standard\|19000' => 19000,
321	'r3mix\|19500' => 19500, // 3.90, 3.90.1, 3.92
322	'r3mix\|19600' => 19600, // 3.90.2, 3.90.3, 3.91
323	'r3mix\|18000' => 18000, // 3.94, 3.95
324	);
325	if (!isset($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))) {
326	$encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
327	}
328	break;
329
330	default:
331	break;
332	}
333	break;
334	}
335	}
336
337	if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
338	if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
339	$encoder_options .= ' --resample 44100';
340	} elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
341	$encoder_options .= ' --resample 48000';
342	} elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
343	switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
344	case 0: // <= 32000
345	// may or may not be same as source frequency - ignore
346	break;
347	case 1: // 44100
348	case 2: // 48000
349	case 3: // 48000+
350	$ExplodedOptions = explode(' ', $encoder_options, 4);
351	switch ($ExplodedOptions[0]) {
352	case '--preset':
353	case '--alt-preset':
354	switch ($ExplodedOptions[1]) {
355	case 'fast':
356	case 'portable':
357	case 'medium':
358	case 'standard':
359	case 'extreme':
360	case 'insane':
361	$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
362	break;
363
364	default:
365	static $ExpectedResampledRate = array(
366	'phon+/lw/mw-eu/sw\|16000' => 16000,
367	'mw-us\|24000' => 24000, // 3.95
368	'mw-us\|32000' => 32000, // 3.93
369	'mw-us\|16000' => 16000, // 3.92
370	'phone\|16000' => 16000,
371	'phone\|11025' => 11025, // 3.94a15
372	'radio\|32000' => 32000, // 3.94a15
373	'fm/radio\|32000' => 32000, // 3.92
374	'fm\|32000' => 32000, // 3.90
375	'voice\|32000' => 32000);
376	if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'\|'.$thisfile_mpeg_audio['sample_rate']])) {
377	$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
378	}
379	break;
380	}
381	break;
382
383	case '--r3mix':
384	default:
385	$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
386	break;
387	}
388	break;
389	}
390	}
391	}
392	if (empty($encoder_options) && !empty($ThisFileInfo['audio']['bitrate']) && !empty($ThisFileInfo['audio']['bitrate_mode'])) {
393	//$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
394	$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
395	}
396
397	return $encoder_options;
398	}
399
400
401	function decodeMPEGaudioHeader($fd, $offset, &$ThisFileInfo, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
402
403	static $MPEGaudioVersionLookup;
404	static $MPEGaudioLayerLookup;
405	static $MPEGaudioBitrateLookup;
406	static $MPEGaudioFrequencyLookup;
407	static $MPEGaudioChannelModeLookup;
408	static $MPEGaudioModeExtensionLookup;
409	static $MPEGaudioEmphasisLookup;
410	if (empty($MPEGaudioVersionLookup)) {
411	$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
412	$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
413	$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
414	$MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
415	$MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
416	$MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
417	$MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
418	}
419
420	if ($offset >= $ThisFileInfo['avdataend']) {
421	$ThisFileInfo['error'][] = 'end of file encounter looking for MPEG synch';
422	return false;
423	}
424	fseek($fd, $offset, SEEK_SET);
425	//$headerstring = fread($fd, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
426	$headerstring = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
427
428	// MP3 audio frame structure:
429	// $aa $aa $aa $aa [$bb $bb] $cc...
430	// where $aa..$aa is the four-byte mpeg-audio header (below)
431	// $bb $bb is the optional 2-byte CRC
432	// and $cc... is the audio data
433
434	$head4 = substr($headerstring, 0, 4);
435
436	static $MPEGaudioHeaderDecodeCache = array();
437	if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
438	$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
439	} else {
440	$MPEGheaderRawArray = getid3_mp3::MPEGaudioHeaderDecode($head4);
441	$MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
442	}
443
444	static $MPEGaudioHeaderValidCache = array();
445
446	// Not in cache
447	if (!isset($MPEGaudioHeaderValidCache[$head4])) {
448	//$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
449	$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
450	}
451
452	// shortcut
453	if (!isset($ThisFileInfo['mpeg']['audio'])) {
454	$ThisFileInfo['mpeg']['audio'] = array();
455	}
456	$thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio'];
457
458
459	if ($MPEGaudioHeaderValidCache[$head4]) {
460	$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
461	} else {
462	$ThisFileInfo['error'][] = 'Invalid MPEG audio header at offset '.$offset;
463	return false;
464	}
465
466	if (!$FastMPEGheaderScan) {
467
468	$thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
469	$thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
470
471	$thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
472	$thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
473	$thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
474	$thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
475	$thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
476	$thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
477	$thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
478	$thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
479	$thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
480
481	$ThisFileInfo['audio']['channels'] = $thisfile_mpeg_audio['channels'];
482	$ThisFileInfo['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
483
484	if ($thisfile_mpeg_audio['protection']) {
485	$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
486	}
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	$ThisFileInfo['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 == $ThisFileInfo['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	$ThisFileInfo['audio']['dataformat'] = 'mp2';
508	switch ($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	$ThisFileInfo['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	$ThisFileInfo['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
526	return false;
527	}
528	break;
529
530	}
531
532	}
533
534
535	if ($ThisFileInfo['audio']['sample_rate'] > 0) {
536	$thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $ThisFileInfo['audio']['sample_rate']);
537	}
538
539	$nextframetestoffset = $offset + 1;
540	if ($thisfile_mpeg_audio['bitrate'] != 'free') {
541
542	$ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
543
544	if (isset($thisfile_mpeg_audio['framelength'])) {
545	$nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
546	} else {
547	$ThisFileInfo['error'][] = 'Frame at offset('.$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	$ThisFileInfo['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	$VBRidOffset = getid3_mp3::XingVBRidOffset($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	//$ThisFileInfo['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
657	$ThisFileInfo['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 12;
658	} else {
659	// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
660	//$ThisFileInfo['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
661	$ThisFileInfo['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['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	$thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($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	$ThisFileInfo['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
763	}
764	$ThisFileInfo['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
765	$ThisFileInfo['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	$ThisFileInfo['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
781	}
782	$ThisFileInfo['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
783	$ThisFileInfo['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	$thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($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	$thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($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	$thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
836	$thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
837	$thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
838	if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
839	$ThisFileInfo['warning'][] = 'Unknown LAME preset used ('.$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	$thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
862	$ThisFileInfo['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	$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
878	if (getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, true)) {
879	$recursivesearch = false;
880	$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
881	}
882	if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
883	$ThisFileInfo['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
884	}
885	}
886
887	}
888
889	}
890
891	if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']))) {
892	if ($ExpectedNumberOfAudioBytes > ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) {
893	if (@$ThisFileInfo['fileformat'] == 'riff') {
894	// ignore, audio data is broken into chunks so will always be data "missing"
895	} elseif (($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) == 1) {
896	$ThisFileInfo['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)';
897	} else {
898	$ThisFileInfo['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])).' bytes)';
899	}
900	} else {
901	if ((($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
902	// $prenullbytefileoffset = ftell($fd);
903	// fseek($fd, $ThisFileInfo['avdataend'], SEEK_SET);
904	// $PossibleNullByte = fread($fd, 1);
905	// fseek($fd, $prenullbytefileoffset, SEEK_SET);
906	// if ($PossibleNullByte === "\x00") {
907	$ThisFileInfo['avdataend']--;
908	// $ThisFileInfo['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored';
909	// } else {
910	// $ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
911	// }
912	} else {
913	$ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
914	}
915	}
916	}
917
918	if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($ThisFileInfo['audio']['bitrate'])) {
919	if (($offset == $ThisFileInfo['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
920	$framebytelength = getid3_mp3::FreeFormatFrameLength($fd, $offset, $ThisFileInfo, true);
921	if ($framebytelength > 0) {
922	$thisfile_mpeg_audio['framelength'] = $framebytelength;
923	if ($thisfile_mpeg_audio['layer'] == '1') {
924	// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
925	$ThisFileInfo['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
926	} else {
927	// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
928	$ThisFileInfo['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
929	}
930	} else {
931	$ThisFileInfo['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
932	}
933	}
934	}
935
936	if (@$thisfile_mpeg_audio['VBR_frames']) {
937	switch ($thisfile_mpeg_audio['bitrate_mode']) {
938	case 'vbr':
939	case 'abr':
940	if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
941	$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 384);
942	} elseif ((($thisfile_mpeg_audio['version'] == '2') \|\| ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
943	$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 576);
944	} else {
945	$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 1152);
946	}
947	if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
948	$ThisFileInfo['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 (!getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $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 < $ThisFileInfo['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 < $ThisFileInfo['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	// $SideInfoOffset += 1;
1065	// }
1066	// }
1067	//}
1068
1069	return true;
1070	}
1071
1072	function RecursiveFrameScanning(&$fd, &$ThisFileInfo, &$offset, &$nextframetestoffset, $ScanAsCBR) {
1073	for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
1074	// check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
1075	if (($nextframetestoffset + 4) >= $ThisFileInfo['avdataend']) {
1076	// end of file
1077	return true;
1078	}
1079
1080	$nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
1081	if (getid3_mp3::decodeMPEGaudioHeader($fd, $nextframetestoffset, $nextframetestarray, false)) {
1082	if ($ScanAsCBR) {
1083	// force CBR mode, used for trying to pick out invalid audio streams with
1084	// valid(?) VBR headers, or VBR streams with no VBR header
1085	if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) \|\| !isset($ThisFileInfo['mpeg']['audio']['bitrate']) \|\| ($nextframetestarray['mpeg']['audio']['bitrate'] != $ThisFileInfo['mpeg']['audio']['bitrate'])) {
1086	return false;
1087	}
1088	}
1089
1090
1091	// next frame is OK, get ready to check the one after that
1092	if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1093	$nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
1094	} else {
1095	$ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
1096	return false;
1097	}
1098
1099	} else {
1100
1101	// next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
1102	$ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';
1103
1104	return false;
1105	}
1106	}
1107	return true;
1108	}
1109
1110	function FreeFormatFrameLength($fd, $offset, &$ThisFileInfo, $deepscan=false) {
1111	fseek($fd, $offset, SEEK_SET);
1112	$MPEGaudioData = fread($fd, 32768);
1113
1114	$SyncPattern1 = substr($MPEGaudioData, 0, 4);
1115	// may be different pattern due to padding
1116	$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) \| 0x02).$SyncPattern1{3};
1117	if ($SyncPattern2 === $SyncPattern1) {
1118	$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3};
1119	}
1120
1121	$framelength = false;
1122	$framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1123	$framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1124	if ($framelength1 > 4) {
1125	$framelength = $framelength1;
1126	}
1127	if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1128	$framelength = $framelength2;
1129	}
1130	if (!$framelength) {
1131
1132	// LAME 3.88 has a different value for modeextension on the first frame vs the rest
1133	$framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
1134	$framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
1135
1136	if ($framelength1 > 4) {
1137	$framelength = $framelength1;
1138	}
1139	if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1140	$framelength = $framelength2;
1141	}
1142	if (!$framelength) {
1143	$ThisFileInfo['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
1144	return false;
1145	} else {
1146	$ThisFileInfo['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
1147	$ThisFileInfo['audio']['codec'] = 'LAME';
1148	$ThisFileInfo['audio']['encoder'] = 'LAME3.88';
1149	$SyncPattern1 = substr($SyncPattern1, 0, 3);
1150	$SyncPattern2 = substr($SyncPattern2, 0, 3);
1151	}
1152	}
1153
1154	if ($deepscan) {
1155
1156	$ActualFrameLengthValues = array();
1157	$nextoffset = $offset + $framelength;
1158	while ($nextoffset < ($ThisFileInfo['avdataend'] - 6)) {
1159	fseek($fd, $nextoffset - 1, SEEK_SET);
1160	$NextSyncPattern = fread($fd, 6);
1161	if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) \|\| (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
1162	// good - found where expected
1163	$ActualFrameLengthValues[] = $framelength;
1164	} elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) \|\| (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
1165	// ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1166	$ActualFrameLengthValues[] = ($framelength - 1);
1167	$nextoffset--;
1168	} elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) \|\| (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
1169	// ok - found one byte later than expected (last frame was padded, first frame wasn't)
1170	$ActualFrameLengthValues[] = ($framelength + 1);
1171	$nextoffset++;
1172	} else {
1173	$ThisFileInfo['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
1174	return false;
1175	}
1176	$nextoffset += $framelength;
1177	}
1178	if (count($ActualFrameLengthValues) > 0) {
1179	$framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1180	}
1181	}
1182	return $framelength;
1183	}
1184
1185	function getOnlyMPEGaudioInfoBruteForce($fd, &$ThisFileInfo) {
1186
1187	$MPEGaudioHeaderDecodeCache = array();
1188	$MPEGaudioHeaderValidCache = array();
1189	$MPEGaudioHeaderLengthCache = array();
1190	$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
1191	$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
1192	$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
1193	$MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
1194	$MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
1195	$MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
1196	$MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
1197	$LongMPEGversionLookup = array();
1198	$LongMPEGlayerLookup = array();
1199	$LongMPEGbitrateLookup = array();
1200	$LongMPEGpaddingLookup = array();
1201	$LongMPEGfrequencyLookup = array();
1202
1203	$Distribution['bitrate'] = array();
1204	$Distribution['frequency'] = array();
1205	$Distribution['layer'] = array();
1206	$Distribution['version'] = array();
1207	$Distribution['padding'] = array();
1208
1209	fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
1210
1211	$max_frames_scan = 5000;
1212	$frames_scanned = 0;
1213
1214	$previousvalidframe = $ThisFileInfo['avdataoffset'];
1215	while (ftell($fd) < $ThisFileInfo['avdataend']) {
1216	set_time_limit(30);
1217	$head4 = fread($fd, 4);
1218	if (strlen($head4) < 4) {
1219	break;
1220	}
1221	if ($head4{0} != "\xFF") {
1222	for ($i = 1; $i < 4; $i++) {
1223	if ($head4{$i} == "\xFF") {
1224	fseek($fd, $i - 4, SEEK_CUR);
1225	continue 2;
1226	}
1227	}
1228	continue;
1229	}
1230	if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1231	$MPEGaudioHeaderDecodeCache[$head4] = getid3_mp3::MPEGaudioHeaderDecode($head4);
1232	}
1233	if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1234	$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
1235	}
1236	if ($MPEGaudioHeaderValidCache[$head4]) {
1237
1238	if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
1239	$LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
1240	$LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
1241	$LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
1242	$LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
1243	$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
1244	$MPEGaudioHeaderLengthCache[$head4] = getid3_mp3::MPEGaudioFrameLength(
1245	$LongMPEGbitrateLookup[$head4],
1246	$LongMPEGversionLookup[$head4],
1247	$LongMPEGlayerLookup[$head4],
1248	$LongMPEGpaddingLookup[$head4],
1249	$LongMPEGfrequencyLookup[$head4]);
1250	}
1251	if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
1252	$WhereWeWere = ftell($fd);
1253	fseek($fd, $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
1254	$next4 = fread($fd, 4);
1255	if ($next4{0} == "\xFF") {
1256	if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
1257	$MPEGaudioHeaderDecodeCache[$next4] = getid3_mp3::MPEGaudioHeaderDecode($next4);
1258	}
1259	if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1260	$MPEGaudioHeaderValidCache[$next4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
1261	}
1262	if ($MPEGaudioHeaderValidCache[$next4]) {
1263	fseek($fd, -4, SEEK_CUR);
1264
1265	@$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]++;
1266	@$Distribution['layer'][$LongMPEGlayerLookup[$head4]]++;
1267	@$Distribution['version'][$LongMPEGversionLookup[$head4]]++;
1268	@$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]++;
1269	@$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]++;
1270	if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
1271	$pct_data_scanned = (ftell($fd) - $ThisFileInfo['avdataoffset']) / ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']);
1272	$ThisFileInfo['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
1273	foreach ($Distribution as $key1 => $value1) {
1274	foreach ($value1 as $key2 => $value2) {
1275	$Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
1276	}
1277	}
1278	break;
1279	}
1280	continue;
1281	}
1282	}
1283	unset($next4);
1284	fseek($fd, $WhereWeWere - 3, SEEK_SET);
1285	}
1286
1287	}
1288	}
1289	foreach ($Distribution as $key => $value) {
1290	ksort($Distribution[$key], SORT_NUMERIC);
1291	}
1292	ksort($Distribution['version'], SORT_STRING);
1293	$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
1294	$ThisFileInfo['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
1295	$ThisFileInfo['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
1296	$ThisFileInfo['mpeg']['audio']['version_distribution'] = $Distribution['version'];
1297	$ThisFileInfo['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
1298	if (count($Distribution['version']) > 1) {
1299	$ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG version detected';
1300	}
1301	if (count($Distribution['layer']) > 1) {
1302	$ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG layer detected';
1303	}
1304	if (count($Distribution['frequency']) > 1) {
1305	$ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
1306	}
1307
1308
1309	$bittotal = 0;
1310	foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1311	if ($bitratevalue != 'free') {
1312	$bittotal += ($bitratevalue * $bitratecount);
1313	}
1314	}
1315	$ThisFileInfo['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
1316	if ($ThisFileInfo['mpeg']['audio']['frame_count'] == 0) {
1317	$ThisFileInfo['error'][] = 'no MPEG audio frames found';
1318	return false;
1319	}
1320	$ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $ThisFileInfo['mpeg']['audio']['frame_count']);
1321	$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
1322	$ThisFileInfo['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
1323
1324	$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
1325	$ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
1326	$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
1327	$ThisFileInfo['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
1328	$ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];
1329
1330	return true;
1331	}
1332
1333
1334	function getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram=false) {
1335
1336	// looks for synch, decodes MPEG audio header
1337
1338	static $MPEGaudioVersionLookup;
1339	static $MPEGaudioLayerLookup;
1340	static $MPEGaudioBitrateLookup;
1341	if (empty($MPEGaudioVersionLookup)) {
1342	$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
1343	$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
1344	$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
1345
1346	}
1347
1348	fseek($fd, $avdataoffset, SEEK_SET);
1349	$sync_seek_buffer_size = min(128 * 1024, $ThisFileInfo['avdataend'] - $avdataoffset);
1350	if ($sync_seek_buffer_size <= 0) {
1351	$ThisFileInfo['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset;
1352	return false;
1353	}
1354	$header = fread($fd, $sync_seek_buffer_size);
1355	$sync_seek_buffer_size = strlen($header);
1356	$SynchSeekOffset = 0;
1357	while ($SynchSeekOffset < $sync_seek_buffer_size) {
1358
1359	if ((($avdataoffset + $SynchSeekOffset) < $ThisFileInfo['avdataend']) && !feof($fd)) {
1360
1361	if ($SynchSeekOffset > $sync_seek_buffer_size) {
1362	// if a synch's not found within the first 128k bytes, then give up
1363	$ThisFileInfo['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB';
1364	if (isset($ThisFileInfo['audio']['bitrate'])) {
1365	unset($ThisFileInfo['audio']['bitrate']);
1366	}
1367	if (isset($ThisFileInfo['mpeg']['audio'])) {
1368	unset($ThisFileInfo['mpeg']['audio']);
1369	}
1370	if (empty($ThisFileInfo['mpeg'])) {
1371	unset($ThisFileInfo['mpeg']);
1372	}
1373	return false;
1374
1375	} elseif (feof($fd)) {
1376
1377	$ThisFileInfo['error'][] = 'Could not find valid MPEG audio synch before end of file';
1378	if (isset($ThisFileInfo['audio']['bitrate'])) {
1379	unset($ThisFileInfo['audio']['bitrate']);
1380	}
1381	if (isset($ThisFileInfo['mpeg']['audio'])) {
1382	unset($ThisFileInfo['mpeg']['audio']);
1383	}
1384	if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) \|\| (count($ThisFileInfo['mpeg']) == 0))) {
1385	unset($ThisFileInfo['mpeg']);
1386	}
1387	return false;
1388	}
1389	}
1390
1391	if (($SynchSeekOffset + 1) >= strlen($header)) {
1392	$ThisFileInfo['error'][] = 'Could not find valid MPEG synch before end of file';
1393	return false;
1394	}
1395
1396	if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected
1397
1398	if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) {
1399	$FirstFrameThisfileInfo = $ThisFileInfo;
1400	$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
1401	if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) {
1402	// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1403	// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1404	unset($FirstFrameThisfileInfo);
1405	}
1406	}
1407
1408	$dummy = $ThisFileInfo; // only overwrite real data if valid header found
1409	if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) {
1410	$ThisFileInfo = $dummy;
1411	$ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1412	switch (@$ThisFileInfo['fileformat']) {
1413	case '':
1414	case 'id3':
1415	case 'ape':
1416	case 'mp3':
1417	$ThisFileInfo['fileformat'] = 'mp3';
1418	$ThisFileInfo['audio']['dataformat'] = 'mp3';
1419	break;
1420	}
1421	if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1422	if (!(abs($ThisFileInfo['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
1423	// If there is garbage data between a valid VBR header frame and a sequence
1424	// of valid MPEG-audio frames the VBR data is no longer discarded.
1425	$ThisFileInfo = $FirstFrameThisfileInfo;
1426	$ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset;
1427	$ThisFileInfo['fileformat'] = 'mp3';
1428	$ThisFileInfo['audio']['dataformat'] = 'mp3';
1429	$dummy = $ThisFileInfo;
1430	unset($dummy['mpeg']['audio']);
1431	$GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1432	$GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
1433	if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
1434
1435	$ThisFileInfo = $dummy;
1436	$ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd;
1437	$ThisFileInfo['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
1438
1439	} else {
1440
1441	$ThisFileInfo['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
1442
1443	}
1444	}
1445	}
1446	if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && ($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) {
1447	// VBR file with no VBR header
1448	$BitrateHistogram = true;
1449	}
1450
1451	if ($BitrateHistogram) {
1452
1453	$ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1454	$ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
1455
1456	if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
1457	if ($ThisFileInfo['mpeg']['audio']['layer'] == 3) {
1458	$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
1459	} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 2) {
1460	$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
1461	} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
1462	$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1463	}
1464	} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
1465	$ThisFileInfo['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);
1466	} else {
1467	$ThisFileInfo['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);
1468	}
1469
1470	$dummy = array('error'=>$ThisFileInfo['error'], 'warning'=>$ThisFileInfo['warning'], 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
1471	$synchstartoffset = $ThisFileInfo['avdataoffset'];
1472	fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
1473
1474	// you can play with these numbers:
1475	$max_frames_scan = 50000;
1476	$max_scan_segments = 10;
1477
1478	// don't play with these numbers:
1479	$FastMode = false;
1480	$SynchErrorsFound = 0;
1481	$frames_scanned = 0;
1482	$this_scan_segment = 0;
1483	$frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
1484	$pct_data_scanned = 0;
1485	for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
1486	//echo 'was at '.ftell($fd).'<br>';
1487	$frames_scanned_this_segment = 0;
1488	if (ftell($fd) >= $ThisFileInfo['avdataend']) {
1489	//echo 'breaking because current position ('.ftell($fd).') is >= $ThisFileInfo[avdataend] ('.$ThisFileInfo['avdataend'].')<br>';
1490	break;
1491	}
1492	$scan_start_offset[$current_segment] = max(ftell($fd), $ThisFileInfo['avdataoffset'] + round($current_segment * (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $max_scan_segments)));
1493	//echo 'start at '.$scan_start_offset[$current_segment].'<br>';
1494	if ($current_segment > 0) {
1495	fseek($fd, $scan_start_offset[$current_segment], SEEK_SET);
1496	$buffer_4k = fread($fd, 4096);
1497	for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
1498	if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected
1499	if (getid3_mp3::decodeMPEGaudioHeader($fd, $scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
1500	$calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
1501	if (getid3_mp3::decodeMPEGaudioHeader($fd, $calculated_next_offset, $dummy, false, false, $FastMode)) {
1502	$scan_start_offset[$current_segment] += $j;
1503	break;
1504	} else {
1505	//echo 'header['.__LINE__.'] at '.($calculated_next_offset).' invalid<br>';
1506	}
1507	} else {
1508	//echo 'header['.__LINE__.'] at '.($scan_start_offset[$current_segment] + $j).' invalid<br>';
1509	}
1510	}
1511	}
1512	}
1513	//echo 'actually start at '.$scan_start_offset[$current_segment].'<br>';
1514	$synchstartoffset = $scan_start_offset[$current_segment];
1515	while (getid3_mp3::decodeMPEGaudioHeader($fd, $synchstartoffset, $dummy, false, false, $FastMode)) {
1516	$FastMode = true;
1517	$thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1518
1519	if (empty($dummy['mpeg']['audio']['framelength'])) {
1520	$SynchErrorsFound++;
1521	$synchstartoffset++;
1522	//echo ' [Ø] ';
1523	} else {
1524	//echo ' . ';
1525	@$ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
1526	@$ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
1527	@$ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
1528
1529	$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
1530	}
1531	$frames_scanned++;
1532	if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
1533	$this_pct_scanned = (ftell($fd) - $scan_start_offset[$current_segment]) / ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']);
1534	if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
1535	// file likely contains < $max_frames_scan, just scan as one segment
1536	$max_scan_segments = 1;
1537	$frames_scan_per_segment = $max_frames_scan;
1538	} else {
1539	$pct_data_scanned += $this_pct_scanned;
1540	//var_dump($pct_data_scanned);
1541	//exit;
1542	break;
1543	}
1544	}
1545	}
1546	//echo '<hr>';
1547	}
1548	if ($pct_data_scanned > 0) {
1549	$ThisFileInfo['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$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.';
1550	foreach ($ThisFileInfo['mpeg']['audio'] as $key1 => $value1) {
1551	if (!eregi('_distribution$', $key1)) {
1552	continue;
1553	}
1554	foreach ($value1 as $key2 => $value2) {
1555	$ThisFileInfo['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
1556	}
1557	}
1558	}
1559
1560	if ($SynchErrorsFound > 0) {
1561	$ThisFileInfo['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
1562	//return false;
1563	}
1564
1565	$bittotal = 0;
1566	$framecounter = 0;
1567	foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1568	$framecounter += $bitratecount;
1569	if ($bitratevalue != 'free') {
1570	$bittotal += ($bitratevalue * $bitratecount);
1571	}
1572	}
1573	if ($framecounter == 0) {
1574	$ThisFileInfo['error'][] = 'Corrupt MP3 file: framecounter == zero';
1575	return false;
1576	}
1577	$ThisFileInfo['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
1578	$ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
1579
1580	$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
1581
1582
1583	// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1584	$distinct_bitrates = 0;
1585	foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
1586	if ($bitrate_count > 0) {
1587	$distinct_bitrates++;
1588	}
1589	}
1590	if ($distinct_bitrates > 1) {
1591	$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
1592	} else {
1593	$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
1594	}
1595	$ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
1596
1597	}
1598
1599	break; // exit while()
1600	}
1601	}
1602
1603	$SynchSeekOffset++;
1604	if (($avdataoffset + $SynchSeekOffset) >= $ThisFileInfo['avdataend']) {
1605	// end of file/data
1606
1607	if (empty($ThisFileInfo['mpeg']['audio'])) {
1608
1609	$ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
1610	if (isset($ThisFileInfo['audio']['bitrate'])) {
1611	unset($ThisFileInfo['audio']['bitrate']);
1612	}
1613	if (isset($ThisFileInfo['mpeg']['audio'])) {
1614	unset($ThisFileInfo['mpeg']['audio']);
1615	}
1616	if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) \|\| empty($ThisFileInfo['mpeg']))) {
1617	unset($ThisFileInfo['mpeg']);
1618	}
1619	return false;
1620
1621	}
1622	break;
1623	}
1624
1625	}
1626	$ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
1627	$ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode'];
1628	$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
1629	return true;
1630	}
1631
1632
1633	function MPEGaudioVersionArray() {
1634	static $MPEGaudioVersion = array('2.5', false, '2', '1');
1635	return $MPEGaudioVersion;
1636	}
1637
1638	function MPEGaudioLayerArray() {
1639	static $MPEGaudioLayer = array(false, 3, 2, 1);
1640	return $MPEGaudioLayer;
1641	}
1642
1643	function MPEGaudioBitrateArray() {
1644	static $MPEGaudioBitrate;
1645	if (empty($MPEGaudioBitrate)) {
1646	$MPEGaudioBitrate = array (
1647	'1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1648	2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1649	3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1650	),
1651
1652	'2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1653	2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
1654	)
1655	);
1656	$MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1657	$MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
1658	}
1659	return $MPEGaudioBitrate;
1660	}
1661
1662	function MPEGaudioFrequencyArray() {
1663	static $MPEGaudioFrequency;
1664	if (empty($MPEGaudioFrequency)) {
1665	$MPEGaudioFrequency = array (
1666	'1' => array(44100, 48000, 32000),
1667	'2' => array(22050, 24000, 16000),
1668	'2.5' => array(11025, 12000, 8000)
1669	);
1670	}
1671	return $MPEGaudioFrequency;
1672	}
1673
1674	function MPEGaudioChannelModeArray() {
1675	static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1676	return $MPEGaudioChannelMode;
1677	}
1678
1679	function MPEGaudioModeExtensionArray() {
1680	static $MPEGaudioModeExtension;
1681	if (empty($MPEGaudioModeExtension)) {
1682	$MPEGaudioModeExtension = array (
1683	1 => array('4-31', '8-31', '12-31', '16-31'),
1684	2 => array('4-31', '8-31', '12-31', '16-31'),
1685	3 => array('', 'IS', 'MS', 'IS+MS')
1686	);
1687	}
1688	return $MPEGaudioModeExtension;
1689	}
1690
1691	function MPEGaudioEmphasisArray() {
1692	static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1693	return $MPEGaudioEmphasis;
1694	}
1695
1696	function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
1697	return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
1698	}
1699
1700	function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
1701	if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
1702	return false;
1703	}
1704
1705	static $MPEGaudioVersionLookup;
1706	static $MPEGaudioLayerLookup;
1707	static $MPEGaudioBitrateLookup;
1708	static $MPEGaudioFrequencyLookup;
1709	static $MPEGaudioChannelModeLookup;
1710	static $MPEGaudioModeExtensionLookup;
1711	static $MPEGaudioEmphasisLookup;
1712	if (empty($MPEGaudioVersionLookup)) {
1713	$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
1714	$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
1715	$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
1716	$MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
1717	$MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
1718	$MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
1719	$MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
1720	}
1721
1722	if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1723	$decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1724	} else {
1725	echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
1726	return false;
1727	}
1728	if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1729	$decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1730	} else {
1731	echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
1732	return false;
1733	}
1734	if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
1735	echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
1736	if ($rawarray['bitrate'] == 15) {
1737	// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1738	// let it go through here otherwise file will not be identified
1739	if (!$allowBitrate15) {
1740	return false;
1741	}
1742	} else {
1743	return false;
1744	}
1745	}
1746	if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
1747	echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
1748	return false;
1749	}
1750	if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
1751	echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
1752	return false;
1753	}
1754	if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
1755	echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
1756	return false;
1757	}
1758	if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
1759	echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
1760	return false;
1761	}
1762	// These are just either set or not set, you can't mess that up :)
1763	// $rawarray['protection'];
1764	// $rawarray['padding'];
1765	// $rawarray['private'];
1766	// $rawarray['copyright'];
1767	// $rawarray['original'];
1768
1769	return true;
1770	}
1771
1772	function MPEGaudioHeaderDecode($Header4Bytes) {
1773	// AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
1774	// A - Frame sync (all bits set)
1775	// B - MPEG Audio version ID
1776	// C - Layer description
1777	// D - Protection bit
1778	// E - Bitrate index
1779	// F - Sampling rate frequency index
1780	// G - Padding bit
1781	// H - Private bit
1782	// I - Channel Mode
1783	// J - Mode extension (Only if Joint stereo)
1784	// K - Copyright
1785	// L - Original
1786	// M - Emphasis
1787
1788	if (strlen($Header4Bytes) != 4) {
1789	return false;
1790	}
1791
1792	$MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
1793	$MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB
1794	$MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC
1795	$MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D
1796	$MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE
1797	$MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF
1798	$MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G
1799	$MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H
1800	$MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II
1801	$MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ
1802	$MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K
1803	$MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L
1804	$MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM
1805
1806	return $MPEGrawHeader;
1807	}
1808
1809	function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) {
1810	static $AudioFrameLengthCache = array();
1811
1812	if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
1813	$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
1814	if ($bitrate != 'free') {
1815
1816	if ($version == '1') {
1817
1818	if ($layer == '1') {
1819
1820	// For Layer I slot is 32 bits long
1821	$FrameLengthCoefficient = 48;
1822	$SlotLength = 4;
1823
1824	} else { // Layer 2 / 3
1825
1826	// for Layer 2 and Layer 3 slot is 8 bits long.
1827	$FrameLengthCoefficient = 144;
1828	$SlotLength = 1;
1829
1830	}
1831
1832	} else { // MPEG-2 / MPEG-2.5
1833
1834	if ($layer == '1') {
1835
1836	// For Layer I slot is 32 bits long
1837	$FrameLengthCoefficient = 24;
1838	$SlotLength = 4;
1839
1840	} elseif ($layer == '2') {
1841
1842	// for Layer 2 and Layer 3 slot is 8 bits long.
1843	$FrameLengthCoefficient = 144;
1844	$SlotLength = 1;
1845
1846	} else { // layer 3
1847
1848	// for Layer 2 and Layer 3 slot is 8 bits long.
1849	$FrameLengthCoefficient = 72;
1850	$SlotLength = 1;
1851
1852	}
1853
1854	}
1855
1856	// FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
1857	if ($samplerate > 0) {
1858	$NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
1859	$NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
1860	if ($padding) {
1861	$NewFramelength += $SlotLength;
1862	}
1863	$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
1864	}
1865	}
1866	}
1867	return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
1868	}
1869
1870	function ClosestStandardMP3Bitrate($bitrate) {
1871	static $StandardBitrates = array(320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
1872	static $BitrateTable = array(0=>'-');
1873	$roundbitrate = intval(round($bitrate, -3));
1874	if (!isset($BitrateTable[$roundbitrate])) {
1875	if ($roundbitrate > 320000) {
1876	$BitrateTable[$roundbitrate] = round($bitrate, -4);
1877	} else {
1878	$LastBitrate = 320000;
1879	foreach ($StandardBitrates as $StandardBitrate) {
1880	$BitrateTable[$roundbitrate] = $StandardBitrate;
1881	if ($roundbitrate >= $StandardBitrate - (($LastBitrate - $StandardBitrate) / 2)) {
1882	break;
1883	}
1884	$LastBitrate = $StandardBitrate;
1885	}
1886	}
1887	}
1888	return $BitrateTable[$roundbitrate];
1889	}
1890
1891	function XingVBRidOffset($version, $channelmode) {
1892	static $XingVBRidOffsetCache = array();
1893	if (empty($XingVBRidOffset)) {
1894	$XingVBRidOffset = array (
1895	'1' => array ('mono' => 0x15, // 4 + 17 = 21
1896	'stereo' => 0x24, // 4 + 32 = 36
1897	'joint stereo' => 0x24,
1898	'dual channel' => 0x24
1899	),
1900
1901	'2' => array ('mono' => 0x0D, // 4 + 9 = 13
1902	'stereo' => 0x15, // 4 + 17 = 21
1903	'joint stereo' => 0x15,
1904	'dual channel' => 0x15
1905	),
1906
1907	'2.5' => array ('mono' => 0x15,
1908	'stereo' => 0x15,
1909	'joint stereo' => 0x15,
1910	'dual channel' => 0x15
1911	)
1912	);
1913	}
1914	return $XingVBRidOffset[$version][$channelmode];
1915	}
1916
1917	function LAMEvbrMethodLookup($VBRmethodID) {
1918	static $LAMEvbrMethodLookup = array(
1919	0x00 => 'unknown',
1920	0x01 => 'cbr',
1921	0x02 => 'abr',
1922	0x03 => 'vbr-old / vbr-rh',
1923	0x04 => 'vbr-new / vbr-mtrh',
1924	0x05 => 'vbr-mt',
1925	0x06 => 'vbr (full vbr method 4)',
1926	0x08 => 'cbr (constant bitrate 2 pass)',
1927	0x09 => 'abr (2 pass)',
1928	0x0F => 'reserved'
1929	);
1930	return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
1931	}
1932
1933	function LAMEmiscStereoModeLookup($StereoModeID) {
1934	static $LAMEmiscStereoModeLookup = array(
1935	0 => 'mono',
1936	1 => 'stereo',
1937	2 => 'dual mono',
1938	3 => 'joint stereo',
1939	4 => 'forced stereo',
1940	5 => 'auto',
1941	6 => 'intensity stereo',
1942	7 => 'other'
1943	);
1944	return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
1945	}
1946
1947	function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
1948	static $LAMEmiscSourceSampleFrequencyLookup = array(
1949	0 => '<= 32 kHz',
1950	1 => '44.1 kHz',
1951	2 => '48 kHz',
1952	3 => '> 48kHz'
1953	);
1954	return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
1955	}
1956
1957	function LAMEsurroundInfoLookup($SurroundInfoID) {
1958	static $LAMEsurroundInfoLookup = array(
1959	0 => 'no surround info',
1960	1 => 'DPL encoding',
1961	2 => 'DPL2 encoding',
1962	3 => 'Ambisonic encoding'
1963	);
1964	return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
1965	}
1966
1967	function LAMEpresetUsedLookup($LAMEtag) {
1968
1969	if ($LAMEtag['preset_used_id'] == 0) {
1970	// no preset used (LAME >=3.93)
1971	// no preset recorded (LAME <3.93)
1972	return '';
1973	}
1974	$LAMEpresetUsedLookup = array();
1975
1976	///// THIS PART CANNOT BE STATIC .
1977	for ($i = 8; $i <= 320; $i++) {
1978	switch ($LAMEtag['vbr_method']) {
1979	case 'cbr':
1980	$LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
1981	break;
1982	case 'abr':
1983	default: // other VBR modes shouldn't be here(?)
1984	$LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
1985	break;
1986	}
1987	}
1988
1989	// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
1990
1991	// named alt-presets
1992	$LAMEpresetUsedLookup[1000] = '--r3mix';
1993	$LAMEpresetUsedLookup[1001] = '--alt-preset standard';
1994	$LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
1995	$LAMEpresetUsedLookup[1003] = '--alt-preset insane';
1996	$LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
1997	$LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
1998	$LAMEpresetUsedLookup[1006] = '--alt-preset medium';
1999	$LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
2000
2001	// LAME 3.94 additions/changes
2002	$LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
2003	$LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
2004
2005	$LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
2006	$LAMEpresetUsedLookup[410] = '-V9';
2007	$LAMEpresetUsedLookup[420] = '-V8';
2008	$LAMEpresetUsedLookup[440] = '-V6';
2009	$LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
2010	$LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
2011	$LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
2012	$LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
2013	$LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
2014	$LAMEpresetUsedLookup[490] = '-V1';
2015	$LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
2016
2017	return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
2018	}
2019
2020	}
2021
2022	?>

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source: extensions/charlies_content/getid3/getid3/module.audio.mp3.php @ 12348

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