1<?php
2
3/////////////////////////////////////////////////////////////////
4/// getID3() by James Heinrich <info@getid3.org> //
5// available at https://github.com/JamesHeinrich/getID3 //
6// or https://www.getid3.org //
7// or http://getid3.sourceforge.net //
8// see readme.txt for more details //
9/////////////////////////////////////////////////////////////////
10// //
11// module.audio.mp3.php //
12// module for analyzing MP3 files //
13// dependencies: NONE //
14// ///
15/////////////////////////////////////////////////////////////////
16
17if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
18 exit;
19}
20
21
22class getid3_mp3 extends getid3_handler
23{
24 /**
25 * Forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow,
26 * unrecommended, but may provide data from otherwise-unusable files.
27 *
28 * @var bool
29 */
30 public $allow_bruteforce = false;
31
32 /**
33 * number of frames to scan to determine if MPEG-audio sequence is valid
34 * Lower this number to 5-20 for faster scanning
35 * Increase this number to 50+ for most accurate detection of valid VBR/CBR mpeg-audio streams
36 *
37 * @var int
38 */
39 public $mp3_valid_check_frames = 50;
40
41 /**
42 * @return bool
43 */
44 public function Analyze() {
45 $info = &$this->getid3->info;
46
47 $initialOffset = $info['avdataoffset'];
48
49 if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
50 if ($this->allow_bruteforce) {
51 $this->error('Rescanning file in BruteForce mode');
52 $this->getOnlyMPEGaudioInfoBruteForce();
53 }
54 }
55
56
57 if (isset($info['mpeg']['audio']['bitrate_mode'])) {
58 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
59 }
60
61 $CurrentDataLAMEversionString = null;
62 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
63
64 $synchoffsetwarning = 'Unknown data before synch ';
65 if (isset($info['id3v2']['headerlength'])) {
66 $synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
67 } elseif ($initialOffset > 0) {
68 $synchoffsetwarning .= '(should be at '.$initialOffset.', ';
69 } else {
70 $synchoffsetwarning .= '(should be at beginning of file, ';
71 }
72 $synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
73 if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
74
75 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
76
77 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
78 $info['audio']['codec'] = 'LAME';
79 $CurrentDataLAMEversionString = 'LAME3.';
80
81 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
82
83 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
84 $info['audio']['codec'] = 'LAME';
85 $CurrentDataLAMEversionString = 'LAME3.';
86
87 }
88
89 }
90 $this->warning($synchoffsetwarning);
91
92 }
93
94 if (isset($info['mpeg']['audio']['LAME'])) {
95 $info['audio']['codec'] = 'LAME';
96 if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
97 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
98 } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
99 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
100 }
101 }
102
103 $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
104 if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
105 // a version number of LAME that does not end with a number like "LAME3.92"
106 // or with a closing parenthesis like "LAME3.88 (alpha)"
107 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
108
109 // not sure what the actual last frame length will be, but will be less than or equal to 1441
110 $PossiblyLongerLAMEversion_FrameLength = 1441;
111
112 // Not sure what version of LAME this is - look in padding of last frame for longer version string
113 $PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
114 $this->fseek($PossibleLAMEversionStringOffset);
115 $PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength);
116 switch (substr($CurrentDataLAMEversionString, -1)) {
117 case 'a':
118 case 'b':
119 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
120 // need to trim off "a" to match longer string
121 $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
122 break;
123 }
124 if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
125 if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
126 $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
127 if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
128 if (!empty($info['audio']['encoder']) && !empty($info['mpeg']['audio']['LAME']['short_version']) && ($info['audio']['encoder'] == $info['mpeg']['audio']['LAME']['short_version'])) {
129 if (preg_match('#^LAME[0-9\\.]+#', $PossiblyLongerLAMEversion_NewString, $matches)) {
130 // "LAME3.100" -> "LAME3.100.1", but avoid including "(alpha)" and similar
131 $info['mpeg']['audio']['LAME']['short_version'] = $matches[0];
132 }
133 }
134 $info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
135 }
136 }
137 }
138 }
139 if (!empty($info['audio']['encoder'])) {
140 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
141 }
142
143 switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
144 case 1:
145 case 2:
146 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
147 break;
148 }
149 if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
150 switch ($info['audio']['dataformat']) {
151 case 'mp1':
152 case 'mp2':
153 case 'mp3':
154 $info['fileformat'] = $info['audio']['dataformat'];
155 break;
156
157 default:
158 $this->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"');
159 break;
160 }
161 }
162
163 if (empty($info['fileformat'])) {
164 unset($info['fileformat']);
165 unset($info['audio']['bitrate_mode']);
166 unset($info['avdataoffset']);
167 unset($info['avdataend']);
168 return false;
169 }
170
171 $info['mime_type'] = 'audio/mpeg';
172 $info['audio']['lossless'] = false;
173
174 // Calculate playtime
175 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
176 // https://github.com/JamesHeinrich/getID3/issues/161
177 // VBR header frame contains ~0.026s of silent audio data, but is not actually part of the original encoding and should be ignored
178 $xingVBRheaderFrameLength = ((isset($info['mpeg']['audio']['VBR_frames']) && isset($info['mpeg']['audio']['framelength'])) ? $info['mpeg']['audio']['framelength'] : 0);
179
180 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset'] - $xingVBRheaderFrameLength) * 8 / $info['audio']['bitrate'];
181 }
182
183 $info['audio']['encoder_options'] = $this->GuessEncoderOptions();
184
185 return true;
186 }
187
188 /**
189 * @return string
190 */
191 public function GuessEncoderOptions() {
192 // shortcuts
193 $info = &$this->getid3->info;
194 $thisfile_mpeg_audio = array();
195 $thisfile_mpeg_audio_lame = array();
196 if (!empty($info['mpeg']['audio'])) {
197 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
198 if (!empty($thisfile_mpeg_audio['LAME'])) {
199 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
200 }
201 }
202
203 $encoder_options = '';
204 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
205
206 if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
207
208 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
209
210 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && isset($thisfile_mpeg_audio_lame['preset_used_id']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) {
211
212 $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
213
214 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
215
216 static $KnownEncoderValues = array();
217 if (empty($KnownEncoderValues)) {
218
219 //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
220 $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
221 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
222 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
223 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
224 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
225 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
226 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
227 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
228 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
229 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
230 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
231 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
232 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
233 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
234 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
235 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
236 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
237
238 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
239 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
240 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
241 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
242 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
243 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
244 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
245 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
246 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
247 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
248 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
249 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
250 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
251 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
252 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
253 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
254 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
255 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
256 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
257 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
258 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
259 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
260 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
261 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
262 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
263 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
264 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
265 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
266 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
267 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
268 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
269 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
270 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
271 }
272
273 if (isset($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']])) {
274
275 $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']];
276
277 } 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']])) {
278
279 $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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
280
281 } elseif ($info['audio']['bitrate_mode'] == 'vbr') {
282
283 // http://gabriel.mp3-tech.org/mp3infotag.html
284 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
285
286
287 $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
288 $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
289 $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value;
290
291 } elseif ($info['audio']['bitrate_mode'] == 'cbr') {
292
293 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
294
295 } else {
296
297 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
298
299 }
300
301 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
302
303 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
304
305 } elseif (!empty($info['audio']['bitrate'])) {
306
307 if ($info['audio']['bitrate_mode'] == 'cbr') {
308 if ($info['audio']['bitrate'] == 'free') {
309 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
310 } else {
311 $encoder_options = strtoupper($info['audio']['bitrate_mode']).round($info['audio']['bitrate'] / 1000);
312 }
313 } else {
314 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
315 }
316
317 }
318 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
319 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
320 }
321
322 if (isset($thisfile_mpeg_audio['bitrate']) && ($thisfile_mpeg_audio['bitrate'] === 'free')) {
323 $encoder_options .= ' --freeformat';
324 }
325
326 if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
327 $encoder_options .= ' --nogap';
328 }
329
330 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
331 $ExplodedOptions = explode(' ', $encoder_options, 4);
332 if ($ExplodedOptions[0] == '--r3mix') {
333 $ExplodedOptions[1] = 'r3mix';
334 }
335 switch ($ExplodedOptions[0]) {
336 case '--preset':
337 case '--alt-preset':
338 case '--r3mix':
339 if ($ExplodedOptions[1] == 'fast') {
340 $ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
341 }
342 switch ($ExplodedOptions[1]) {
343 case 'portable':
344 case 'medium':
345 case 'standard':
346 case 'extreme':
347 case 'insane':
348 case 'fast portable':
349 case 'fast medium':
350 case 'fast standard':
351 case 'fast extreme':
352 case 'fast insane':
353 case 'r3mix':
354 static $ExpectedLowpass = array(
355 'insane|20500' => 20500,
356 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
357 'medium|18000' => 18000,
358 'fast medium|18000' => 18000,
359 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
360 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
361 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
362 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
363 'standard|19000' => 19000,
364 'fast standard|19000' => 19000,
365 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
366 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
367 'r3mix|18000' => 18000, // 3.94, 3.95
368 );
369 if (!isset($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))) {
370 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
371 }
372 break;
373
374 default:
375 break;
376 }
377 break;
378 }
379 }
380
381 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
382 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
383 $encoder_options .= ' --resample 44100';
384 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
385 $encoder_options .= ' --resample 48000';
386 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
387 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
388 case 0: // <= 32000
389 // may or may not be same as source frequency - ignore
390 break;
391 case 1: // 44100
392 case 2: // 48000
393 case 3: // 48000+
394 $ExplodedOptions = explode(' ', $encoder_options, 4);
395 switch ($ExplodedOptions[0]) {
396 case '--preset':
397 case '--alt-preset':
398 switch ($ExplodedOptions[1]) {
399 case 'fast':
400 case 'portable':
401 case 'medium':
402 case 'standard':
403 case 'extreme':
404 case 'insane':
405 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
406 break;
407
408 default:
409 static $ExpectedResampledRate = array(
410 'phon+/lw/mw-eu/sw|16000' => 16000,
411 'mw-us|24000' => 24000, // 3.95
412 'mw-us|32000' => 32000, // 3.93
413 'mw-us|16000' => 16000, // 3.92
414 'phone|16000' => 16000,
415 'phone|11025' => 11025, // 3.94a15
416 'radio|32000' => 32000, // 3.94a15
417 'fm/radio|32000' => 32000, // 3.92
418 'fm|32000' => 32000, // 3.90
419 'voice|32000' => 32000);
420 if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
421 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
422 }
423 break;
424 }
425 break;
426
427 case '--r3mix':
428 default:
429 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
430 break;
431 }
432 break;
433 }
434 }
435 }
436 if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
437 //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
438 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
439 }
440
441 return $encoder_options;
442 }
443
444 /**
445 * @param int $offset
446 * @param array $info
447 * @param bool $recursivesearch
448 * @param bool $ScanAsCBR
449 * @param bool $FastMPEGheaderScan
450 *
451 * @return bool
452 */
453 public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
454 static $MPEGaudioVersionLookup;
455 static $MPEGaudioLayerLookup;
456 static $MPEGaudioBitrateLookup;
457 static $MPEGaudioFrequencyLookup;
458 static $MPEGaudioChannelModeLookup;
459 static $MPEGaudioModeExtensionLookup;
460 static $MPEGaudioEmphasisLookup;
461 if (empty($MPEGaudioVersionLookup)) {
462 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
463 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
464 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
465 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
466 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
467 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
468 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
469 }
470
471 if ($this->fseek($offset) != 0) {
472 $this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$offset);
473 return false;
474 }
475 //$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
476 $headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
477
478 // MP3 audio frame structure:
479 // $aa $aa $aa $aa [$bb $bb] $cc...
480 // where $aa..$aa is the four-byte mpeg-audio header (below)
481 // $bb $bb is the optional 2-byte CRC
482 // and $cc... is the audio data
483
484 $head4 = substr($headerstring, 0, 4);
485 $head4_key = getid3_lib::PrintHexBytes($head4, true, false, false);
486 static $MPEGaudioHeaderDecodeCache = array();
487 if (isset($MPEGaudioHeaderDecodeCache[$head4_key])) {
488 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4_key];
489 } else {
490 $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
491 $MPEGaudioHeaderDecodeCache[$head4_key] = $MPEGheaderRawArray;
492 }
493
494 static $MPEGaudioHeaderValidCache = array();
495 if (!isset($MPEGaudioHeaderValidCache[$head4_key])) { // Not in cache
496 //$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
497 $MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
498 }
499
500 // shortcut
501 if (!isset($info['mpeg']['audio'])) {
502 $info['mpeg']['audio'] = array();
503 }
504 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
505
506 if ($MPEGaudioHeaderValidCache[$head4_key]) {
507 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
508 } else {
509 $this->warning('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset);
510 return false;
511 }
512
513 if (!$FastMPEGheaderScan) {
514 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
515 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
516
517 $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
518 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
519 $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
520 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
521 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
522 $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
523 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
524 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
525 $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
526
527 $info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
528 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
529
530 if ($thisfile_mpeg_audio['protection']) {
531 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
532 }
533 }
534
535 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
536 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
537 $this->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1');
538 $thisfile_mpeg_audio['raw']['bitrate'] = 0;
539 }
540 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
541 $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
542
543 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
544 // only skip multiple frame check if free-format bitstream found at beginning of file
545 // otherwise is quite possibly simply corrupted data
546 $recursivesearch = false;
547 }
548
549 // For Layer 2 there are some combinations of bitrate and mode which are not allowed.
550 if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
551
552 $info['audio']['dataformat'] = 'mp2';
553 switch ($thisfile_mpeg_audio['channelmode']) {
554
555 case 'mono':
556 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
557 // these are ok
558 } else {
559 $this->error($thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
560 return false;
561 }
562 break;
563
564 case 'stereo':
565 case 'joint stereo':
566 case 'dual channel':
567 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
568 // these are ok
569 } else {
570 $this->error(intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
571 return false;
572 }
573 break;
574
575 }
576
577 }
578
579
580 if ($info['audio']['sample_rate'] > 0) {
581 $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
582 }
583
584 $nextframetestoffset = $offset + 1;
585 if ($thisfile_mpeg_audio['bitrate'] != 'free') {
586
587 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
588
589 if (isset($thisfile_mpeg_audio['framelength'])) {
590 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
591 } else {
592 $this->error('Frame at offset('.$offset.') is has an invalid frame length.');
593 return false;
594 }
595
596 }
597
598 $ExpectedNumberOfAudioBytes = 0;
599
600 ////////////////////////////////////////////////////////////////////////////////////
601 // Variable-bitrate headers
602
603 if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
604 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
605 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
606
607 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
608 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
609 $info['audio']['codec'] = 'Fraunhofer';
610
611 $SideInfoData = substr($headerstring, 4 + 2, 32);
612
613 $FraunhoferVBROffset = 36;
614
615 $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion
616 $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay
617 $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality
618 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
619 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
620 $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
621 $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
622 $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
623 $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames
624
625 $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
626
627 $previousbyteoffset = $offset;
628 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
629 $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
630 $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
631 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
632 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
633 $previousbyteoffset += $Fraunhofer_OffsetN;
634 }
635
636
637 } else {
638
639 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
640 // depending on MPEG layer and number of channels
641
642 $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
643 $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
644
645 if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
646 // 'Xing' is traditional Xing VBR frame
647 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
648 // 'Info' *can* legally be used to specify a VBR file as well, however.
649
650 // http://www.multiweb.cz/twoinches/MP3inside.htm
651 //00..03 = "Xing" or "Info"
652 //04..07 = Flags:
653 // 0x01 Frames Flag set if value for number of frames in file is stored
654 // 0x02 Bytes Flag set if value for filesize in bytes is stored
655 // 0x04 TOC Flag set if values for TOC are stored
656 // 0x08 VBR Scale Flag set if values for VBR scale is stored
657 //08..11 Frames: Number of frames in file (including the first Xing/Info one)
658 //12..15 Bytes: File length in Bytes
659 //16..115 TOC (Table of Contents):
660 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
661 // Each Byte has a value according this formula:
662 // (TOC[i] / 256) * fileLenInBytes
663 // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
664 // TOC[(60/240)*100] = TOC[25]
665 // and corresponding Byte in file is then approximately at:
666 // (TOC[25]/256) * 5000000
667 //116..119 VBR Scale
668
669
670 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
671// if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
672 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
673 $thisfile_mpeg_audio['VBR_method'] = 'Xing';
674// } else {
675// $ScanAsCBR = true;
676// $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
677// }
678
679 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
680
681 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
682 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
683 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
684 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
685
686 if ($thisfile_mpeg_audio['xing_flags']['frames']) {
687 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4));
688 //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
689 }
690 if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
691 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
692 }
693
694 //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
695 //if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
696 if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
697 $used_filesize = 0;
698 if (!empty($thisfile_mpeg_audio['VBR_bytes'])) {
699 $used_filesize = $thisfile_mpeg_audio['VBR_bytes'];
700 } elseif (!empty($info['filesize'])) {
701 $used_filesize = $info['filesize'];
702 $used_filesize -= (isset($info['id3v2']['headerlength']) ? intval($info['id3v2']['headerlength']) : 0);
703 $used_filesize -= (isset($info['id3v1']) ? 128 : 0);
704 $used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0);
705 $this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes');
706 }
707
708 $framelengthfloat = $used_filesize / $thisfile_mpeg_audio['VBR_frames'];
709
710 if ($thisfile_mpeg_audio['layer'] == '1') {
711 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
712 //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
713 $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
714 } else {
715 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
716 //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
717 $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
718 }
719 $thisfile_mpeg_audio['framelength'] = (int) floor($framelengthfloat);
720 }
721
722 if ($thisfile_mpeg_audio['xing_flags']['toc']) {
723 $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
724 for ($i = 0; $i < 100; $i++) {
725 $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData[$i]);
726 }
727 }
728 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
729 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
730 }
731
732
733 // http://gabriel.mp3-tech.org/mp3infotag.html
734 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
735
736 // shortcut
737 $thisfile_mpeg_audio['LAME'] = array();
738 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
739
740
741 $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20);
742 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
743
744 //$thisfile_mpeg_audio_lame['numeric_version'] = str_replace('LAME', '', $thisfile_mpeg_audio_lame['short_version']);
745 $thisfile_mpeg_audio_lame['numeric_version'] = '';
746 if (preg_match('#^LAME([0-9\\.a-z]*)#', $thisfile_mpeg_audio_lame['long_version'], $matches)) {
747 $thisfile_mpeg_audio_lame['short_version'] = $matches[0];
748 $thisfile_mpeg_audio_lame['numeric_version'] = $matches[1];
749 }
750 if (strlen($thisfile_mpeg_audio_lame['numeric_version']) > 0) {
751 foreach (explode('.', $thisfile_mpeg_audio_lame['numeric_version']) as $key => $number) {
752 $thisfile_mpeg_audio_lame['integer_version'][$key] = intval($number);
753 }
754 //if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
755 if ((($thisfile_mpeg_audio_lame['integer_version'][0] * 1000) + $thisfile_mpeg_audio_lame['integer_version'][1]) >= 3090) { // cannot use string version compare, may have "LAME3.90" or "LAME3.100" -- see https://github.com/JamesHeinrich/getID3/issues/207
756
757 // extra 11 chars are not part of version string when LAMEtag present
758 unset($thisfile_mpeg_audio_lame['long_version']);
759
760 // It the LAME tag was only introduced in LAME v3.90
761 // https://wiki.hydrogenaud.io/index.php/LAME#VBR_header_and_LAME_tag
762 // https://hydrogenaud.io/index.php?topic=9933
763
764 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
765 // are assuming a 'Xing' identifier offset of 0x24, which is the case for
766 // MPEG-1 non-mono, but not for other combinations
767 $LAMEtagOffsetContant = $VBRidOffset - 0x24;
768
769 // shortcuts
770 $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array());
771 $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD'];
772 $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
773 $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
774 $thisfile_mpeg_audio_lame['raw'] = array();
775 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
776
777 // byte $9B VBR Quality
778 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
779 // Actually overwrites original Xing bytes
780 unset($thisfile_mpeg_audio['VBR_scale']);
781 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
782
783 // bytes $9C-$A4 Encoder short VersionString
784 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
785
786 // byte $A5 Info Tag revision + VBR method
787 $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
788
789 $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
790 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
791 $thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
792 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
793
794 // byte $A6 Lowpass filter value
795 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
796
797 // bytes $A7-$AE Replay Gain
798 // https://web.archive.org/web/20021015212753/http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
799 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
800 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
801 // LAME 3.94a16 and later - 9.23 fixed point
802 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
803 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
804 } else {
805 // LAME 3.94a15 and earlier - 32-bit floating point
806 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
807 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
808 }
809 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
810 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
811 } else {
812 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
813 }
814
815 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
816 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
817
818
819 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
820
821 $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
822 $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
823 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
824 $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
825 $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
826 $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
827 $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
828
829 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
830 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
831 }
832 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
833 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
834 } else {
835 unset($thisfile_mpeg_audio_lame_RGAD['track']);
836 }
837 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
838
839 $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
840 $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
841 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
842 $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
843 $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
844 $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
845 $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
846
847 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
848 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
849 }
850 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
851 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
852 } else {
853 unset($thisfile_mpeg_audio_lame_RGAD['album']);
854 }
855 if (empty($thisfile_mpeg_audio_lame_RGAD)) {
856 unset($thisfile_mpeg_audio_lame['RGAD']);
857 }
858
859
860 // byte $AF Encoding flags + ATH Type
861 $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
862 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10);
863 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
864 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40);
865 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80);
866 $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F;
867
868 // byte $B0 if ABR {specified bitrate} else {minimal bitrate}
869 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
870 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
871 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
872 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
873 // ignore
874 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
875 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
876 }
877
878 // bytes $B1-$B3 Encoder delays
879 $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
880 $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
881 $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF;
882
883 // byte $B4 Misc
884 $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
885 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03);
886 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
887 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
888 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
889 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
890 $thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
891 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
892 $thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
893
894 // byte $B5 MP3 Gain
895 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
896 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
897 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
898
899 // bytes $B6-$B7 Preset and surround info
900 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
901 // Reserved = ($PresetSurroundBytes & 0xC000);
902 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
903 $thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
904 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
905 $thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
906 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
907 $this->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');
908 }
909 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
910 // this may change if 3.90.4 ever comes out
911 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
912 }
913
914 // bytes $B8-$BB MusicLength
915 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
916 $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
917
918 // bytes $BC-$BD MusicCRC
919 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
920
921 // bytes $BE-$BF CRC-16 of Info Tag
922 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
923
924
925 // LAME CBR
926 if (($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) && ($thisfile_mpeg_audio['bitrate'] !== 'free')) {
927
928 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
929 $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
930 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
931 //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
932 // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
933 //}
934
935 }
936
937 }
938 }
939 }
940
941 } else {
942
943 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
944 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
945 if ($recursivesearch) {
946 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
947 if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
948 $recursivesearch = false;
949 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
950 }
951 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
952 $this->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');
953 }
954 }
955
956 }
957
958 }
959
960 if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
961 if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
962 if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) {
963 // ignore, audio data is broken into chunks so will always be data "missing"
964 }
965 elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
966 $this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
967 }
968 else {
969 $this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');
970 }
971 } else {
972 if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
973 // $prenullbytefileoffset = $this->ftell();
974 // $this->fseek($info['avdataend']);
975 // $PossibleNullByte = $this->fread(1);
976 // $this->fseek($prenullbytefileoffset);
977 // if ($PossibleNullByte === "\x00") {
978 $info['avdataend']--;
979 // $this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored');
980 // } else {
981 // $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
982 // }
983 } else {
984 $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
985 }
986 }
987 }
988
989 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
990 if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
991 $framebytelength = $this->FreeFormatFrameLength($offset, true);
992 if ($framebytelength > 0) {
993 $thisfile_mpeg_audio['framelength'] = $framebytelength;
994 if ($thisfile_mpeg_audio['layer'] == '1') {
995 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
996 $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
997 } else {
998 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
999 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
1000 }
1001 } else {
1002 $this->error('Error calculating frame length of free-format MP3 without Xing/LAME header');
1003 }
1004 }
1005 }
1006
1007 if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
1008 switch ($thisfile_mpeg_audio['bitrate_mode']) {
1009 case 'vbr':
1010 case 'abr':
1011 $bytes_per_frame = 1152;
1012 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
1013 $bytes_per_frame = 384;
1014 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
1015 $bytes_per_frame = 576;
1016 }
1017 $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
1018 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
1019 $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
1020 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
1021 }
1022 break;
1023 }
1024 }
1025
1026 // End variable-bitrate headers
1027 ////////////////////////////////////////////////////////////////////////////////////
1028
1029 if ($recursivesearch) {
1030
1031 if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
1032 return false;
1033 }
1034 if (!empty($this->getid3->info['mp3_validity_check_bitrates']) && !empty($thisfile_mpeg_audio['bitrate_mode']) && ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') && !empty($thisfile_mpeg_audio['VBR_bitrate'])) {
1035 // https://github.com/JamesHeinrich/getID3/issues/287
1036 if (count(array_keys($this->getid3->info['mp3_validity_check_bitrates'])) == 1) {
1037 list($cbr_bitrate_in_short_scan) = array_keys($this->getid3->info['mp3_validity_check_bitrates']);
1038 $deviation_cbr_from_header_bitrate = abs($thisfile_mpeg_audio['VBR_bitrate'] - $cbr_bitrate_in_short_scan) / $cbr_bitrate_in_short_scan;
1039 if ($deviation_cbr_from_header_bitrate < 0.01) {
1040 // VBR header bitrate may differ slightly from true bitrate of frames, perhaps accounting for overhead of VBR header frame itself?
1041 // If measured CBR bitrate is within 1% of specified bitrate in VBR header then assume that file is truly CBR
1042 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
1043 //$this->warning('VBR header ignored, assuming CBR '.round($cbr_bitrate_in_short_scan / 1000).'kbps based on scan of '.$this->mp3_valid_check_frames.' frames');
1044 }
1045 }
1046 }
1047 if (isset($this->getid3->info['mp3_validity_check_bitrates'])) {
1048 unset($this->getid3->info['mp3_validity_check_bitrates']);
1049 }
1050
1051 }
1052
1053
1054 //if (false) {
1055 // // experimental side info parsing section - not returning anything useful yet
1056 //
1057 // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
1058 // $SideInfoOffset = 0;
1059 //
1060 // if ($thisfile_mpeg_audio['version'] == '1') {
1061 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1062 // // MPEG-1 (mono)
1063 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1064 // $SideInfoOffset += 9;
1065 // $SideInfoOffset += 5;
1066 // } else {
1067 // // MPEG-1 (stereo, joint-stereo, dual-channel)
1068 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1069 // $SideInfoOffset += 9;
1070 // $SideInfoOffset += 3;
1071 // }
1072 // } else { // 2 or 2.5
1073 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1074 // // MPEG-2, MPEG-2.5 (mono)
1075 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1076 // $SideInfoOffset += 8;
1077 // $SideInfoOffset += 1;
1078 // } else {
1079 // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
1080 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1081 // $SideInfoOffset += 8;
1082 // $SideInfoOffset += 2;
1083 // }
1084 // }
1085 //
1086 // if ($thisfile_mpeg_audio['version'] == '1') {
1087 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1088 // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
1089 // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1090 // $SideInfoOffset += 2;
1091 // }
1092 // }
1093 // }
1094 // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
1095 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1096 // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
1097 // $SideInfoOffset += 12;
1098 // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1099 // $SideInfoOffset += 9;
1100 // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1101 // $SideInfoOffset += 8;
1102 // if ($thisfile_mpeg_audio['version'] == '1') {
1103 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1104 // $SideInfoOffset += 4;
1105 // } else {
1106 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1107 // $SideInfoOffset += 9;
1108 // }
1109 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1110 // $SideInfoOffset += 1;
1111 //
1112 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
1113 //
1114 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
1115 // $SideInfoOffset += 2;
1116 // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1117 // $SideInfoOffset += 1;
1118 //
1119 // for ($region = 0; $region < 2; $region++) {
1120 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1121 // $SideInfoOffset += 5;
1122 // }
1123 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
1124 //
1125 // for ($window = 0; $window < 3; $window++) {
1126 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1127 // $SideInfoOffset += 3;
1128 // }
1129 //
1130 // } else {
1131 //
1132 // for ($region = 0; $region < 3; $region++) {
1133 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1134 // $SideInfoOffset += 5;
1135 // }
1136 //
1137 // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1138 // $SideInfoOffset += 4;
1139 // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1140 // $SideInfoOffset += 3;
1141 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
1142 // }
1143 //
1144 // if ($thisfile_mpeg_audio['version'] == '1') {
1145 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1146 // $SideInfoOffset += 1;
1147 // }
1148 // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1149 // $SideInfoOffset += 1;
1150 // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1151 // $SideInfoOffset += 1;
1152 // }
1153 // }
1154 //}
1155
1156 return true;
1157 }
1158
1159 /**
1160 * @param int $offset
1161 * @param int $nextframetestoffset
1162 * @param bool $ScanAsCBR
1163 *
1164 * @return bool
1165 */
1166 public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) {
1167 $info = &$this->getid3->info;
1168 $firstframetestarray = array('error' => array(), 'warning'=> array(), 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
1169 $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
1170
1171 $info['mp3_validity_check_bitrates'] = array();
1172 for ($i = 0; $i < $this->mp3_valid_check_frames; $i++) {
1173 // check next (default: 50) frames for validity, to make sure we haven't run across a false synch
1174 if (($nextframetestoffset + 4) >= $info['avdataend']) {
1175 // end of file
1176 return true;
1177 }
1178
1179 $nextframetestarray = array('error' => array(), 'warning' => array(), 'avdataend' => $info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1180 if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
1181 getid3_lib::safe_inc($info['mp3_validity_check_bitrates'][$nextframetestarray['mpeg']['audio']['bitrate']]);
1182 if ($ScanAsCBR) {
1183 // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
1184 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
1185 return false;
1186 }
1187 }
1188
1189
1190 // next frame is OK, get ready to check the one after that
1191 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1192 $nextframetestoffset += (int) $nextframetestarray['mpeg']['audio']['framelength'];
1193 } else {
1194 $this->error('Frame at offset ('.$offset.') is has an invalid frame length.');
1195 return false;
1196 }
1197
1198 } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
1199
1200 // it's not the end of the file, but there's not enough data left for another frame, so assume it's garbage/padding and return OK
1201 return true;
1202
1203 } else {
1204
1205 // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
1206 $this->warning('Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.');
1207
1208 return false;
1209 }
1210 }
1211 return true;
1212 }
1213
1214 /**
1215 * @param int $offset
1216 * @param bool $deepscan
1217 *
1218 * @return int|false
1219 */
1220 public function FreeFormatFrameLength($offset, $deepscan=false) {
1221 $info = &$this->getid3->info;
1222
1223 $this->fseek($offset);
1224 $MPEGaudioData = $this->fread(32768);
1225
1226 $SyncPattern1 = substr($MPEGaudioData, 0, 4);
1227 // may be different pattern due to padding
1228 $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) | 0x02).$SyncPattern1[3];
1229 if ($SyncPattern2 === $SyncPattern1) {
1230 $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) & 0xFD).$SyncPattern1[3];
1231 }
1232
1233 $framelength = false;
1234 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1235 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1236 if ($framelength1 > 4) {
1237 $framelength = $framelength1;
1238 }
1239 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1240 $framelength = $framelength2;
1241 }
1242 if (!$framelength) {
1243
1244 // LAME 3.88 has a different value for modeextension on the first frame vs the rest
1245 $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
1246 $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
1247
1248 if ($framelength1 > 4) {
1249 $framelength = $framelength1;
1250 }
1251 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1252 $framelength = $framelength2;
1253 }
1254 if (!$framelength) {
1255 $this->error('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset);
1256 return false;
1257 } else {
1258 $this->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)');
1259 $info['audio']['codec'] = 'LAME';
1260 $info['audio']['encoder'] = 'LAME3.88';
1261 $SyncPattern1 = substr($SyncPattern1, 0, 3);
1262 $SyncPattern2 = substr($SyncPattern2, 0, 3);
1263 }
1264 }
1265
1266 if ($deepscan) {
1267
1268 $ActualFrameLengthValues = array();
1269 $nextoffset = $offset + $framelength;
1270 while ($nextoffset < ($info['avdataend'] - 6)) {
1271 $this->fseek($nextoffset - 1);
1272 $NextSyncPattern = $this->fread(6);
1273 if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
1274 // good - found where expected
1275 $ActualFrameLengthValues[] = $framelength;
1276 } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
1277 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1278 $ActualFrameLengthValues[] = ($framelength - 1);
1279 $nextoffset--;
1280 } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
1281 // ok - found one byte later than expected (last frame was padded, first frame wasn't)
1282 $ActualFrameLengthValues[] = ($framelength + 1);
1283 $nextoffset++;
1284 } else {
1285 $this->error('Did not find expected free-format sync pattern at offset '.$nextoffset);
1286 return false;
1287 }
1288 $nextoffset += $framelength;
1289 }
1290 if (count($ActualFrameLengthValues) > 0) {
1291 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1292 }
1293 }
1294 return $framelength;
1295 }
1296
1297 /**
1298 * @return bool
1299 */
1300 public function getOnlyMPEGaudioInfoBruteForce() {
1301 $MPEGaudioHeaderDecodeCache = array();
1302 $MPEGaudioHeaderValidCache = array();
1303 $MPEGaudioHeaderLengthCache = array();
1304 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1305 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1306 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1307 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1308 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1309 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1310 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1311 $LongMPEGversionLookup = array();
1312 $LongMPEGlayerLookup = array();
1313 $LongMPEGbitrateLookup = array();
1314 $LongMPEGpaddingLookup = array();
1315 $LongMPEGfrequencyLookup = array();
1316 $Distribution = array();
1317 $Distribution['bitrate'] = array();
1318 $Distribution['frequency'] = array();
1319 $Distribution['layer'] = array();
1320 $Distribution['version'] = array();
1321 $Distribution['padding'] = array();
1322
1323 $info = &$this->getid3->info;
1324 $this->fseek($info['avdataoffset']);
1325
1326 $max_frames_scan = 5000;
1327 $frames_scanned = 0;
1328
1329 $previousvalidframe = $info['avdataoffset'];
1330 while ($this->ftell() < $info['avdataend']) {
1331 set_time_limit(30);
1332 $head4 = $this->fread(4);
1333 if (strlen($head4) < 4) {
1334 break;
1335 }
1336 if ($head4[0] != "\xFF") {
1337 for ($i = 1; $i < 4; $i++) {
1338 if ($head4[$i] == "\xFF") {
1339 $this->fseek($i - 4, SEEK_CUR);
1340 continue 2;
1341 }
1342 }
1343 continue;
1344 }
1345 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1346 $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
1347 }
1348 if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1349 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
1350 }
1351 if ($MPEGaudioHeaderValidCache[$head4]) {
1352
1353 if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
1354 $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
1355 $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
1356 $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
1357 $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
1358 $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
1359 $MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
1360 $LongMPEGbitrateLookup[$head4],
1361 $LongMPEGversionLookup[$head4],
1362 $LongMPEGlayerLookup[$head4],
1363 $LongMPEGpaddingLookup[$head4],
1364 $LongMPEGfrequencyLookup[$head4]);
1365 }
1366 if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
1367 $WhereWeWere = $this->ftell();
1368 $this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
1369 $next4 = $this->fread(4);
1370 if ($next4[0] == "\xFF") {
1371 if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
1372 $MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
1373 }
1374 if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1375 $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
1376 }
1377 if ($MPEGaudioHeaderValidCache[$next4]) {
1378 $this->fseek(-4, SEEK_CUR);
1379
1380 $Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]] = isset($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]) ? ++$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]] : 1;
1381 $Distribution['layer'][$LongMPEGlayerLookup[$head4]] = isset($Distribution['layer'][$LongMPEGlayerLookup[$head4]]) ? ++$Distribution['layer'][$LongMPEGlayerLookup[$head4]] : 1;
1382 $Distribution['version'][$LongMPEGversionLookup[$head4]] = isset($Distribution['version'][$LongMPEGversionLookup[$head4]]) ? ++$Distribution['version'][$LongMPEGversionLookup[$head4]] : 1;
1383 $Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])] = isset($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]) ? ++$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])] : 1;
1384 $Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]] = isset($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]) ? ++$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]] : 1;
1385 if (++$frames_scanned >= $max_frames_scan) {
1386 $pct_data_scanned = getid3_lib::SafeDiv($this->ftell() - $info['avdataoffset'], $info['avdataend'] - $info['avdataoffset']);
1387 $this->warning('too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.');
1388 foreach ($Distribution as $key1 => $value1) {
1389 foreach ($value1 as $key2 => $value2) {
1390 $Distribution[$key1][$key2] = $pct_data_scanned ? round($value2 / $pct_data_scanned) : 1;
1391 }
1392 }
1393 break;
1394 }
1395 continue;
1396 }
1397 }
1398 unset($next4);
1399 $this->fseek($WhereWeWere - 3);
1400 }
1401
1402 }
1403 }
1404 foreach ($Distribution as $key => $value) {
1405 ksort($Distribution[$key], SORT_NUMERIC);
1406 }
1407 ksort($Distribution['version'], SORT_STRING);
1408 $info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
1409 $info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
1410 $info['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
1411 $info['mpeg']['audio']['version_distribution'] = $Distribution['version'];
1412 $info['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
1413 if (count($Distribution['version']) > 1) {
1414 $this->error('Corrupt file - more than one MPEG version detected');
1415 }
1416 if (count($Distribution['layer']) > 1) {
1417 $this->error('Corrupt file - more than one MPEG layer detected');
1418 }
1419 if (count($Distribution['frequency']) > 1) {
1420 $this->error('Corrupt file - more than one MPEG sample rate detected');
1421 }
1422
1423
1424 $bittotal = 0;
1425 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1426 if ($bitratevalue != 'free') {
1427 $bittotal += ($bitratevalue * $bitratecount);
1428 }
1429 }
1430 $info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
1431 if ($info['mpeg']['audio']['frame_count'] == 0) {
1432 $this->error('no MPEG audio frames found');
1433 return false;
1434 }
1435 $info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']);
1436 $info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
1437 $info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
1438
1439 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1440 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1441 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1442 $info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
1443 $info['fileformat'] = $info['audio']['dataformat'];
1444
1445 return true;
1446 }
1447
1448 /**
1449 * @param int $avdataoffset
1450 * @param bool $BitrateHistogram
1451 *
1452 * @return bool
1453 */
1454 public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) {
1455 // looks for synch, decodes MPEG audio header
1456
1457 $info = &$this->getid3->info;
1458
1459 static $MPEGaudioVersionLookup;
1460 static $MPEGaudioLayerLookup;
1461 static $MPEGaudioBitrateLookup;
1462 if (empty($MPEGaudioVersionLookup)) {
1463 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1464 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1465 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1466 }
1467
1468 $this->fseek($avdataoffset);
1469 $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset);
1470 if ($sync_seek_buffer_size <= 0) {
1471 $this->error('Invalid $sync_seek_buffer_size at offset '.$avdataoffset);
1472 return false;
1473 }
1474 $header = $this->fread($sync_seek_buffer_size);
1475 $sync_seek_buffer_size = strlen($header);
1476 $SynchSeekOffset = 0;
1477 $SyncSeekAttempts = 0;
1478 $SyncSeekAttemptsMax = 1000;
1479 $FirstFrameThisfileInfo = null;
1480 while ($SynchSeekOffset < $sync_seek_buffer_size) {
1481 if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !$this->feof()) {
1482
1483 if ($SynchSeekOffset > $sync_seek_buffer_size) {
1484 // if a synch's not found within the first 128k bytes, then give up
1485 $this->error('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB');
1486 if (isset($info['audio']['bitrate'])) {
1487 unset($info['audio']['bitrate']);
1488 }
1489 if (isset($info['mpeg']['audio'])) {
1490 unset($info['mpeg']['audio']);
1491 }
1492 if (empty($info['mpeg'])) {
1493 unset($info['mpeg']);
1494 }
1495 return false;
1496 }
1497 }
1498
1499 if (($SynchSeekOffset + 1) >= strlen($header)) {
1500 $this->error('Could not find valid MPEG synch before end of file');
1501 return false;
1502 }
1503
1504 if (($header[$SynchSeekOffset] == "\xFF") && ($header[($SynchSeekOffset + 1)] > "\xE0")) { // possible synch detected
1505 if (++$SyncSeekAttempts >= $SyncSeekAttemptsMax) {
1506 // https://github.com/JamesHeinrich/getID3/issues/286
1507 // corrupt files claiming to be MP3, with a large number of 0xFF bytes near the beginning, can cause this loop to take a very long time
1508 // should have escape condition to avoid spending too much time scanning a corrupt file
1509 // if a synch's not found within the first 128k bytes, then give up
1510 $this->error('Could not find valid MPEG audio synch after scanning '.$SyncSeekAttempts.' candidate offsets');
1511 if (isset($info['audio']['bitrate'])) {
1512 unset($info['audio']['bitrate']);
1513 }
1514 if (isset($info['mpeg']['audio'])) {
1515 unset($info['mpeg']['audio']);
1516 }
1517 if (empty($info['mpeg'])) {
1518 unset($info['mpeg']);
1519 }
1520 return false;
1521 }
1522 $FirstFrameAVDataOffset = null;
1523 if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
1524 $FirstFrameThisfileInfo = $info;
1525 $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
1526 if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) {
1527 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1528 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1529 unset($FirstFrameThisfileInfo);
1530 }
1531 }
1532
1533 $dummy = $info; // only overwrite real data if valid header found
1534 if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
1535 $info = $dummy;
1536 $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1537 switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
1538 case '':
1539 case 'id3':
1540 case 'ape':
1541 case 'mp3':
1542 $info['fileformat'] = 'mp3';
1543 $info['audio']['dataformat'] = 'mp3';
1544 break;
1545 }
1546 if (isset($FirstFrameThisfileInfo) && isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1547 if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
1548 // If there is garbage data between a valid VBR header frame and a sequence
1549 // of valid MPEG-audio frames the VBR data is no longer discarded.
1550 $info = $FirstFrameThisfileInfo;
1551 $info['avdataoffset'] = $FirstFrameAVDataOffset;
1552 $info['fileformat'] = 'mp3';
1553 $info['audio']['dataformat'] = 'mp3';
1554 $dummy = $info;
1555 unset($dummy['mpeg']['audio']);
1556 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1557 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
1558 if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) {
1559 $info = $dummy;
1560 $info['avdataoffset'] = $GarbageOffsetEnd;
1561 $this->warning('apparently-valid VBR header not used because could not find '.$this->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);
1562 } else {
1563 $this->warning('using data from VBR header even though could not find '.$this->mp3_valid_check_frames.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')');
1564 }
1565 }
1566 }
1567 if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
1568 // VBR file with no VBR header
1569 $BitrateHistogram = true;
1570 }
1571
1572 if ($BitrateHistogram) {
1573
1574 $info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1575 $info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
1576
1577 if ($info['mpeg']['audio']['version'] == '1') {
1578 if ($info['mpeg']['audio']['layer'] == 3) {
1579 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
1580 } elseif ($info['mpeg']['audio']['layer'] == 2) {
1581 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
1582 } elseif ($info['mpeg']['audio']['layer'] == 1) {
1583 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1584 }
1585 } elseif ($info['mpeg']['audio']['layer'] == 1) {
1586 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0);
1587 } else {
1588 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0);
1589 }
1590
1591 $dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1592 $synchstartoffset = $info['avdataoffset'];
1593 $this->fseek($info['avdataoffset']);
1594
1595 // you can play with these numbers:
1596 $max_frames_scan = 50000;
1597 $max_scan_segments = 10;
1598
1599 // don't play with these numbers:
1600 $FastMode = false;
1601 $SynchErrorsFound = 0;
1602 $frames_scanned = 0;
1603 $this_scan_segment = 0;
1604 $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
1605 $pct_data_scanned = 0;
1606 for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
1607 $frames_scanned_this_segment = 0;
1608 $scan_start_offset = array();
1609 if ($this->ftell() >= $info['avdataend']) {
1610 break;
1611 }
1612 $scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
1613 if ($current_segment > 0) {
1614 $this->fseek($scan_start_offset[$current_segment]);
1615 $buffer_4k = $this->fread(4096);
1616 for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
1617 if (($buffer_4k[$j] == "\xFF") && ($buffer_4k[($j + 1)] > "\xE0")) { // synch detected
1618 if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
1619 $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
1620 if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) {
1621 $scan_start_offset[$current_segment] += $j;
1622 break;
1623 }
1624 }
1625 }
1626 }
1627 }
1628 $synchstartoffset = $scan_start_offset[$current_segment];
1629 while (($synchstartoffset < $info['avdataend']) && $this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) {
1630 $FastMode = true;
1631 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1632
1633 if (empty($dummy['mpeg']['audio']['framelength'])) {
1634 $SynchErrorsFound++;
1635 $synchstartoffset++;
1636 } else {
1637 getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
1638 getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
1639 getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
1640 $synchstartoffset += $dummy['mpeg']['audio']['framelength'];
1641 }
1642 $frames_scanned++;
1643 if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
1644 $this_pct_scanned = getid3_lib::SafeDiv($this->ftell() - $scan_start_offset[$current_segment], $info['avdataend'] - $info['avdataoffset']);
1645 if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
1646 // file likely contains < $max_frames_scan, just scan as one segment
1647 $max_scan_segments = 1;
1648 $frames_scan_per_segment = $max_frames_scan;
1649 } else {
1650 $pct_data_scanned += $this_pct_scanned;
1651 break;
1652 }
1653 }
1654 }
1655 }
1656 if ($pct_data_scanned > 0) {
1657 $this->warning('too many MPEG audio frames to scan, only scanned '.$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.');
1658 foreach ($info['mpeg']['audio'] as $key1 => $value1) {
1659 if (!preg_match('#_distribution$#i', $key1)) {
1660 continue;
1661 }
1662 foreach ($value1 as $key2 => $value2) {
1663 $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
1664 }
1665 }
1666 }
1667
1668 if ($SynchErrorsFound > 0) {
1669 $this->warning('Found '.$SynchErrorsFound.' synch errors in histogram analysis');
1670 //return false;
1671 }
1672
1673 $bittotal = 0;
1674 $framecounter = 0;
1675 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1676 $framecounter += $bitratecount;
1677 if ($bitratevalue != 'free') {
1678 $bittotal += ($bitratevalue * $bitratecount);
1679 }
1680 }
1681 if ($framecounter == 0) {
1682 $this->error('Corrupt MP3 file: framecounter == zero');
1683 return false;
1684 }
1685 $info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
1686 $info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
1687
1688 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1689
1690
1691 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1692 $distinct_bitrates = 0;
1693 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
1694 if ($bitrate_count > 0) {
1695 $distinct_bitrates++;
1696 }
1697 }
1698 if ($distinct_bitrates > 1) {
1699 $info['mpeg']['audio']['bitrate_mode'] = 'vbr';
1700 } else {
1701 $info['mpeg']['audio']['bitrate_mode'] = 'cbr';
1702 }
1703 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1704
1705 }
1706
1707 break; // exit while()
1708 }
1709 }
1710
1711 $SynchSeekOffset++;
1712 if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
1713 // end of file/data
1714
1715 if (empty($info['mpeg']['audio'])) {
1716
1717 $this->error('could not find valid MPEG synch before end of file');
1718 if (isset($info['audio']['bitrate'])) {
1719 unset($info['audio']['bitrate']);
1720 }
1721 if (isset($info['mpeg']['audio'])) {
1722 unset($info['mpeg']['audio']);
1723 }
1724 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
1725 unset($info['mpeg']);
1726 }
1727 return false;
1728
1729 }
1730 break;
1731 }
1732
1733 }
1734 $info['audio']['channels'] = $info['mpeg']['audio']['channels'];
1735 if ($info['audio']['channels'] < 1) {
1736 $this->error('Corrupt MP3 file: no channels');
1737 return false;
1738 }
1739 $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
1740 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1741 return true;
1742 }
1743
1744 /**
1745 * @return array
1746 */
1747 public static function MPEGaudioVersionArray() {
1748 static $MPEGaudioVersion = array('2.5', false, '2', '1');
1749 return $MPEGaudioVersion;
1750 }
1751
1752 /**
1753 * @return array
1754 */
1755 public static function MPEGaudioLayerArray() {
1756 static $MPEGaudioLayer = array(false, 3, 2, 1);
1757 return $MPEGaudioLayer;
1758 }
1759
1760 /**
1761 * @return array
1762 */
1763 public static function MPEGaudioBitrateArray() {
1764 static $MPEGaudioBitrate;
1765 if (empty($MPEGaudioBitrate)) {
1766 $MPEGaudioBitrate = array (
1767 '1' => array(
1768 1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1769 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1770 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1771 ),
1772 '2' => array(
1773 1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1774 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
1775 ),
1776 );
1777 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1778 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
1779 }
1780 return $MPEGaudioBitrate;
1781 }
1782
1783 /**
1784 * @return array
1785 */
1786 public static function MPEGaudioFrequencyArray() {
1787 static $MPEGaudioFrequency;
1788 if (empty($MPEGaudioFrequency)) {
1789 $MPEGaudioFrequency = array (
1790 '1' => array(44100, 48000, 32000),
1791 '2' => array(22050, 24000, 16000),
1792 '2.5' => array(11025, 12000, 8000)
1793 );
1794 }
1795 return $MPEGaudioFrequency;
1796 }
1797
1798 /**
1799 * @return array
1800 */
1801 public static function MPEGaudioChannelModeArray() {
1802 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1803 return $MPEGaudioChannelMode;
1804 }
1805
1806 /**
1807 * @return array
1808 */
1809 public static function MPEGaudioModeExtensionArray() {
1810 static $MPEGaudioModeExtension;
1811 if (empty($MPEGaudioModeExtension)) {
1812 $MPEGaudioModeExtension = array (
1813 1 => array('4-31', '8-31', '12-31', '16-31'),
1814 2 => array('4-31', '8-31', '12-31', '16-31'),
1815 3 => array('', 'IS', 'MS', 'IS+MS')
1816 );
1817 }
1818 return $MPEGaudioModeExtension;
1819 }
1820
1821 /**
1822 * @return array
1823 */
1824 public static function MPEGaudioEmphasisArray() {
1825 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1826 return $MPEGaudioEmphasis;
1827 }
1828
1829 /**
1830 * @param string $head4
1831 * @param bool $allowBitrate15
1832 *
1833 * @return bool
1834 */
1835 public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
1836 return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
1837 }
1838
1839 /**
1840 * @param array $rawarray
1841 * @param bool $echoerrors
1842 * @param bool $allowBitrate15
1843 *
1844 * @return bool
1845 */
1846 public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
1847 if (!isset($rawarray['synch']) || ($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
1848 return false;
1849 }
1850
1851 static $MPEGaudioVersionLookup;
1852 static $MPEGaudioLayerLookup;
1853 static $MPEGaudioBitrateLookup;
1854 static $MPEGaudioFrequencyLookup;
1855 static $MPEGaudioChannelModeLookup;
1856 static $MPEGaudioModeExtensionLookup;
1857 static $MPEGaudioEmphasisLookup;
1858 if (empty($MPEGaudioVersionLookup)) {
1859 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1860 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1861 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1862 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1863 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1864 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1865 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1866 }
1867
1868 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1869 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1870 } else {
1871 echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
1872 return false;
1873 }
1874 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1875 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1876 } else {
1877 echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
1878 return false;
1879 }
1880 if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
1881 echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
1882 if ($rawarray['bitrate'] == 15) {
1883 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1884 // let it go through here otherwise file will not be identified
1885 if (!$allowBitrate15) {
1886 return false;
1887 }
1888 } else {
1889 return false;
1890 }
1891 }
1892 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
1893 echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
1894 return false;
1895 }
1896 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
1897 echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
1898 return false;
1899 }
1900 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
1901 echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
1902 return false;
1903 }
1904 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
1905 echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
1906 return false;
1907 }
1908 // These are just either set or not set, you can't mess that up :)
1909 // $rawarray['protection'];
1910 // $rawarray['padding'];
1911 // $rawarray['private'];
1912 // $rawarray['copyright'];
1913 // $rawarray['original'];
1914
1915 return true;
1916 }
1917
1918 /**
1919 * @param string $Header4Bytes
1920 *
1921 * @return array|false
1922 */
1923 public static function MPEGaudioHeaderDecode($Header4Bytes) {
1924 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
1925 // A - Frame sync (all bits set)
1926 // B - MPEG Audio version ID
1927 // C - Layer description
1928 // D - Protection bit
1929 // E - Bitrate index
1930 // F - Sampling rate frequency index
1931 // G - Padding bit
1932 // H - Private bit
1933 // I - Channel Mode
1934 // J - Mode extension (Only if Joint stereo)
1935 // K - Copyright
1936 // L - Original
1937 // M - Emphasis
1938
1939 if (strlen($Header4Bytes) != 4) {
1940 return false;
1941 }
1942
1943 $MPEGrawHeader = array();
1944 $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
1945 $MPEGrawHeader['version'] = (ord($Header4Bytes[1]) & 0x18) >> 3; // BB
1946 $MPEGrawHeader['layer'] = (ord($Header4Bytes[1]) & 0x06) >> 1; // CC
1947 $MPEGrawHeader['protection'] = (ord($Header4Bytes[1]) & 0x01); // D
1948 $MPEGrawHeader['bitrate'] = (ord($Header4Bytes[2]) & 0xF0) >> 4; // EEEE
1949 $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes[2]) & 0x0C) >> 2; // FF
1950 $MPEGrawHeader['padding'] = (ord($Header4Bytes[2]) & 0x02) >> 1; // G
1951 $MPEGrawHeader['private'] = (ord($Header4Bytes[2]) & 0x01); // H
1952 $MPEGrawHeader['channelmode'] = (ord($Header4Bytes[3]) & 0xC0) >> 6; // II
1953 $MPEGrawHeader['modeextension'] = (ord($Header4Bytes[3]) & 0x30) >> 4; // JJ
1954 $MPEGrawHeader['copyright'] = (ord($Header4Bytes[3]) & 0x08) >> 3; // K
1955 $MPEGrawHeader['original'] = (ord($Header4Bytes[3]) & 0x04) >> 2; // L
1956 $MPEGrawHeader['emphasis'] = (ord($Header4Bytes[3]) & 0x03); // MM
1957
1958 return $MPEGrawHeader;
1959 }
1960
1961 /**
1962 * @param int|string $bitrate
1963 * @param string $version
1964 * @param string $layer
1965 * @param bool $padding
1966 * @param int $samplerate
1967 *
1968 * @return int|false
1969 */
1970 public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) {
1971 static $AudioFrameLengthCache = array();
1972
1973 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
1974 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
1975 if ($bitrate != 'free') {
1976
1977 if ($version == '1') {
1978
1979 if ($layer == '1') {
1980
1981 // For Layer I slot is 32 bits long
1982 $FrameLengthCoefficient = 48;
1983 $SlotLength = 4;
1984
1985 } else { // Layer 2 / 3
1986
1987 // for Layer 2 and Layer 3 slot is 8 bits long.
1988 $FrameLengthCoefficient = 144;
1989 $SlotLength = 1;
1990
1991 }
1992
1993 } else { // MPEG-2 / MPEG-2.5
1994
1995 if ($layer == '1') {
1996
1997 // For Layer I slot is 32 bits long
1998 $FrameLengthCoefficient = 24;
1999 $SlotLength = 4;
2000
2001 } elseif ($layer == '2') {
2002
2003 // for Layer 2 and Layer 3 slot is 8 bits long.
2004 $FrameLengthCoefficient = 144;
2005 $SlotLength = 1;
2006
2007 } else { // layer 3
2008
2009 // for Layer 2 and Layer 3 slot is 8 bits long.
2010 $FrameLengthCoefficient = 72;
2011 $SlotLength = 1;
2012
2013 }
2014
2015 }
2016
2017 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
2018 if ($samplerate > 0) {
2019 $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
2020 $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
2021 if ($padding) {
2022 $NewFramelength += $SlotLength;
2023 }
2024 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
2025 }
2026 }
2027 }
2028 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
2029 }
2030
2031 /**
2032 * @param float|int $bit_rate
2033 *
2034 * @return int|float|string
2035 */
2036 public static function ClosestStandardMP3Bitrate($bit_rate) {
2037 static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
2038 static $bit_rate_table = array (0=>'-');
2039 $round_bit_rate = intval(round($bit_rate, -3));
2040 if (!isset($bit_rate_table[$round_bit_rate])) {
2041 if ($round_bit_rate > max($standard_bit_rates)) {
2042 $bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate));
2043 } else {
2044 $bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
2045 foreach ($standard_bit_rates as $standard_bit_rate) {
2046 if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
2047 break;
2048 }
2049 $bit_rate_table[$round_bit_rate] = $standard_bit_rate;
2050 }
2051 }
2052 }
2053 return $bit_rate_table[$round_bit_rate];
2054 }
2055
2056 /**
2057 * @param string $version
2058 * @param string $channelmode
2059 *
2060 * @return int
2061 */
2062 public static function XingVBRidOffset($version, $channelmode) {
2063 static $XingVBRidOffsetCache = array();
2064 if (empty($XingVBRidOffsetCache)) {
2065 $XingVBRidOffsetCache = array (
2066 '1' => array ('mono' => 0x15, // 4 + 17 = 21
2067 'stereo' => 0x24, // 4 + 32 = 36
2068 'joint stereo' => 0x24,
2069 'dual channel' => 0x24
2070 ),
2071
2072 '2' => array ('mono' => 0x0D, // 4 + 9 = 13
2073 'stereo' => 0x15, // 4 + 17 = 21
2074 'joint stereo' => 0x15,
2075 'dual channel' => 0x15
2076 ),
2077
2078 '2.5' => array ('mono' => 0x15,
2079 'stereo' => 0x15,
2080 'joint stereo' => 0x15,
2081 'dual channel' => 0x15
2082 )
2083 );
2084 }
2085 return $XingVBRidOffsetCache[$version][$channelmode];
2086 }
2087
2088 /**
2089 * @param int $VBRmethodID
2090 *
2091 * @return string
2092 */
2093 public static function LAMEvbrMethodLookup($VBRmethodID) {
2094 static $LAMEvbrMethodLookup = array(
2095 0x00 => 'unknown',
2096 0x01 => 'cbr',
2097 0x02 => 'abr',
2098 0x03 => 'vbr-old / vbr-rh',
2099 0x04 => 'vbr-new / vbr-mtrh',
2100 0x05 => 'vbr-mt',
2101 0x06 => 'vbr (full vbr method 4)',
2102 0x08 => 'cbr (constant bitrate 2 pass)',
2103 0x09 => 'abr (2 pass)',
2104 0x0F => 'reserved'
2105 );
2106 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
2107 }
2108
2109 /**
2110 * @param int $StereoModeID
2111 *
2112 * @return string
2113 */
2114 public static function LAMEmiscStereoModeLookup($StereoModeID) {
2115 static $LAMEmiscStereoModeLookup = array(
2116 0 => 'mono',
2117 1 => 'stereo',
2118 2 => 'dual mono',
2119 3 => 'joint stereo',
2120 4 => 'forced stereo',
2121 5 => 'auto',
2122 6 => 'intensity stereo',
2123 7 => 'other'
2124 );
2125 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
2126 }
2127
2128 /**
2129 * @param int $SourceSampleFrequencyID
2130 *
2131 * @return string
2132 */
2133 public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
2134 static $LAMEmiscSourceSampleFrequencyLookup = array(
2135 0 => '<= 32 kHz',
2136 1 => '44.1 kHz',
2137 2 => '48 kHz',
2138 3 => '> 48kHz'
2139 );
2140 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
2141 }
2142
2143 /**
2144 * @param int $SurroundInfoID
2145 *
2146 * @return string
2147 */
2148 public static function LAMEsurroundInfoLookup($SurroundInfoID) {
2149 static $LAMEsurroundInfoLookup = array(
2150 0 => 'no surround info',
2151 1 => 'DPL encoding',
2152 2 => 'DPL2 encoding',
2153 3 => 'Ambisonic encoding'
2154 );
2155 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
2156 }
2157
2158 /**
2159 * @param array $LAMEtag
2160 *
2161 * @return string
2162 */
2163 public static function LAMEpresetUsedLookup($LAMEtag) {
2164
2165 if ($LAMEtag['preset_used_id'] == 0) {
2166 // no preset used (LAME >=3.93)
2167 // no preset recorded (LAME <3.93)
2168 return '';
2169 }
2170 $LAMEpresetUsedLookup = array();
2171
2172 ///// THIS PART CANNOT BE STATIC .
2173 for ($i = 8; $i <= 320; $i++) {
2174 switch ($LAMEtag['vbr_method']) {
2175 case 'cbr':
2176 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
2177 break;
2178 case 'abr':
2179 default: // other VBR modes shouldn't be here(?)
2180 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
2181 break;
2182 }
2183 }
2184
2185 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
2186
2187 // named alt-presets
2188 $LAMEpresetUsedLookup[1000] = '--r3mix';
2189 $LAMEpresetUsedLookup[1001] = '--alt-preset standard';
2190 $LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
2191 $LAMEpresetUsedLookup[1003] = '--alt-preset insane';
2192 $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
2193 $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
2194 $LAMEpresetUsedLookup[1006] = '--alt-preset medium';
2195 $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
2196
2197 // LAME 3.94 additions/changes
2198 $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
2199 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
2200
2201 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
2202 $LAMEpresetUsedLookup[410] = '-V9';
2203 $LAMEpresetUsedLookup[420] = '-V8';
2204 $LAMEpresetUsedLookup[440] = '-V6';
2205 $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
2206 $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
2207 $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
2208 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
2209 $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
2210 $LAMEpresetUsedLookup[490] = '-V1';
2211 $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
2212
2213 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
2214 }
2215
2216}
2217