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[lhc/web/www.git] / www / plugins-dist / medias / lib / getid3 / module.audio.mp3.php
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
17 if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
18 exit;
19 }
20
21 // number of frames to scan to determine if MPEG-audio sequence is valid
22 // Lower this number to 5-20 for faster scanning
23 // Increase this number to 50+ for most accurate detection of valid VBR/CBR
24 // mpeg-audio streams
25 define('GETID3_MP3_VALID_CHECK_FRAMES', 35);
26
27
28 class getid3_mp3 extends getid3_handler
29 {
30 /**
31 * Forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow,
32 * unrecommended, but may provide data from otherwise-unusable files.
33 *
34 * @var bool
35 */
36 public $allow_bruteforce = false;
37
38 /**
39 * @return bool
40 */
41 public function Analyze() {
42 $info = &$this->getid3->info;
43
44 $initialOffset = $info['avdataoffset'];
45
46 if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
47 if ($this->allow_bruteforce) {
48 $this->error('Rescanning file in BruteForce mode');
49 $this->getOnlyMPEGaudioInfoBruteForce();
50 }
51 }
52
53
54 if (isset($info['mpeg']['audio']['bitrate_mode'])) {
55 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
56 }
57
58 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
59
60 $synchoffsetwarning = 'Unknown data before synch ';
61 if (isset($info['id3v2']['headerlength'])) {
62 $synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
63 } elseif ($initialOffset > 0) {
64 $synchoffsetwarning .= '(should be at '.$initialOffset.', ';
65 } else {
66 $synchoffsetwarning .= '(should be at beginning of file, ';
67 }
68 $synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
69 if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
70
71 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
72
73 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
74 $info['audio']['codec'] = 'LAME';
75 $CurrentDataLAMEversionString = 'LAME3.';
76
77 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
78
79 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
80 $info['audio']['codec'] = 'LAME';
81 $CurrentDataLAMEversionString = 'LAME3.';
82
83 }
84
85 }
86 $this->warning($synchoffsetwarning);
87
88 }
89
90 if (isset($info['mpeg']['audio']['LAME'])) {
91 $info['audio']['codec'] = 'LAME';
92 if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
93 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
94 } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
95 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
96 }
97 }
98
99 $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
100 if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
101 // a version number of LAME that does not end with a number like "LAME3.92"
102 // or with a closing parenthesis like "LAME3.88 (alpha)"
103 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
104
105 // not sure what the actual last frame length will be, but will be less than or equal to 1441
106 $PossiblyLongerLAMEversion_FrameLength = 1441;
107
108 // Not sure what version of LAME this is - look in padding of last frame for longer version string
109 $PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
110 $this->fseek($PossibleLAMEversionStringOffset);
111 $PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength);
112 switch (substr($CurrentDataLAMEversionString, -1)) {
113 case 'a':
114 case 'b':
115 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
116 // need to trim off "a" to match longer string
117 $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
118 break;
119 }
120 if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
121 if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
122 $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
123 if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
124 $info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
125 }
126 }
127 }
128 }
129 if (!empty($info['audio']['encoder'])) {
130 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
131 }
132
133 switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
134 case 1:
135 case 2:
136 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
137 break;
138 }
139 if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
140 switch ($info['audio']['dataformat']) {
141 case 'mp1':
142 case 'mp2':
143 case 'mp3':
144 $info['fileformat'] = $info['audio']['dataformat'];
145 break;
146
147 default:
148 $this->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"');
149 break;
150 }
151 }
152
153 if (empty($info['fileformat'])) {
154 unset($info['fileformat']);
155 unset($info['audio']['bitrate_mode']);
156 unset($info['avdataoffset']);
157 unset($info['avdataend']);
158 return false;
159 }
160
161 $info['mime_type'] = 'audio/mpeg';
162 $info['audio']['lossless'] = false;
163
164 // Calculate playtime
165 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
166 // https://github.com/JamesHeinrich/getID3/issues/161
167 // VBR header frame contains ~0.026s of silent audio data, but is not actually part of the original encoding and should be ignored
168 $xingVBRheaderFrameLength = ((isset($info['mpeg']['audio']['VBR_frames']) && isset($info['mpeg']['audio']['framelength'])) ? $info['mpeg']['audio']['framelength'] : 0);
169
170 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset'] - $xingVBRheaderFrameLength) * 8 / $info['audio']['bitrate'];
171 }
172
173 $info['audio']['encoder_options'] = $this->GuessEncoderOptions();
174
175 return true;
176 }
177
178 /**
179 * @return string
180 */
181 public function GuessEncoderOptions() {
182 // shortcuts
183 $info = &$this->getid3->info;
184 $thisfile_mpeg_audio = array();
185 $thisfile_mpeg_audio_lame = array();
186 if (!empty($info['mpeg']['audio'])) {
187 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
188 if (!empty($thisfile_mpeg_audio['LAME'])) {
189 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
190 }
191 }
192
193 $encoder_options = '';
194 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
195
196 if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
197
198 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
199
200 } 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))) {
201
202 $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
203
204 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
205
206 static $KnownEncoderValues = array();
207 if (empty($KnownEncoderValues)) {
208
209 //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
210 $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
211 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
212 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
213 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
214 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
215 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
216 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
217 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
218 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
219 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
220 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
221 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
222 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
223 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
224 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
225 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
226 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
227
228 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
229 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
230 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
231 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
232 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
233 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
234 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
235 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
236 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
237 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
238 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
239 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
240 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
241 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
242 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
243 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
244 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
245 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
246 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
247 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
248 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
249 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
250 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
251 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
252 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
253 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
254 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
255 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
256 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
257 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
258 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
259 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
260 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
261 }
262
263 if (isset($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']])) {
264
265 $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']];
266
267 } 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']])) {
268
269 $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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
270
271 } elseif ($info['audio']['bitrate_mode'] == 'vbr') {
272
273 // http://gabriel.mp3-tech.org/mp3infotag.html
274 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
275
276
277 $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
278 $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
279 $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value;
280
281 } elseif ($info['audio']['bitrate_mode'] == 'cbr') {
282
283 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
284
285 } else {
286
287 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
288
289 }
290
291 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
292
293 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
294
295 } elseif (!empty($info['audio']['bitrate'])) {
296
297 if ($info['audio']['bitrate_mode'] == 'cbr') {
298 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
299 } else {
300 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
301 }
302
303 }
304 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
305 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
306 }
307
308 if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
309 $encoder_options .= ' --nogap';
310 }
311
312 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
313 $ExplodedOptions = explode(' ', $encoder_options, 4);
314 if ($ExplodedOptions[0] == '--r3mix') {
315 $ExplodedOptions[1] = 'r3mix';
316 }
317 switch ($ExplodedOptions[0]) {
318 case '--preset':
319 case '--alt-preset':
320 case '--r3mix':
321 if ($ExplodedOptions[1] == 'fast') {
322 $ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
323 }
324 switch ($ExplodedOptions[1]) {
325 case 'portable':
326 case 'medium':
327 case 'standard':
328 case 'extreme':
329 case 'insane':
330 case 'fast portable':
331 case 'fast medium':
332 case 'fast standard':
333 case 'fast extreme':
334 case 'fast insane':
335 case 'r3mix':
336 static $ExpectedLowpass = array(
337 'insane|20500' => 20500,
338 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
339 'medium|18000' => 18000,
340 'fast medium|18000' => 18000,
341 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
342 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
343 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
344 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
345 'standard|19000' => 19000,
346 'fast standard|19000' => 19000,
347 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
348 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
349 'r3mix|18000' => 18000, // 3.94, 3.95
350 );
351 if (!isset($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))) {
352 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
353 }
354 break;
355
356 default:
357 break;
358 }
359 break;
360 }
361 }
362
363 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
364 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
365 $encoder_options .= ' --resample 44100';
366 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
367 $encoder_options .= ' --resample 48000';
368 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
369 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
370 case 0: // <= 32000
371 // may or may not be same as source frequency - ignore
372 break;
373 case 1: // 44100
374 case 2: // 48000
375 case 3: // 48000+
376 $ExplodedOptions = explode(' ', $encoder_options, 4);
377 switch ($ExplodedOptions[0]) {
378 case '--preset':
379 case '--alt-preset':
380 switch ($ExplodedOptions[1]) {
381 case 'fast':
382 case 'portable':
383 case 'medium':
384 case 'standard':
385 case 'extreme':
386 case 'insane':
387 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
388 break;
389
390 default:
391 static $ExpectedResampledRate = array(
392 'phon+/lw/mw-eu/sw|16000' => 16000,
393 'mw-us|24000' => 24000, // 3.95
394 'mw-us|32000' => 32000, // 3.93
395 'mw-us|16000' => 16000, // 3.92
396 'phone|16000' => 16000,
397 'phone|11025' => 11025, // 3.94a15
398 'radio|32000' => 32000, // 3.94a15
399 'fm/radio|32000' => 32000, // 3.92
400 'fm|32000' => 32000, // 3.90
401 'voice|32000' => 32000);
402 if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
403 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
404 }
405 break;
406 }
407 break;
408
409 case '--r3mix':
410 default:
411 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
412 break;
413 }
414 break;
415 }
416 }
417 }
418 if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
419 //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
420 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
421 }
422
423 return $encoder_options;
424 }
425
426 /**
427 * @param int $offset
428 * @param array $info
429 * @param bool $recursivesearch
430 * @param bool $ScanAsCBR
431 * @param bool $FastMPEGheaderScan
432 *
433 * @return bool
434 */
435 public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
436 static $MPEGaudioVersionLookup;
437 static $MPEGaudioLayerLookup;
438 static $MPEGaudioBitrateLookup;
439 static $MPEGaudioFrequencyLookup;
440 static $MPEGaudioChannelModeLookup;
441 static $MPEGaudioModeExtensionLookup;
442 static $MPEGaudioEmphasisLookup;
443 if (empty($MPEGaudioVersionLookup)) {
444 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
445 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
446 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
447 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
448 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
449 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
450 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
451 }
452
453 if ($this->fseek($offset) != 0) {
454 $this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$offset);
455 return false;
456 }
457 //$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
458 $headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
459
460 // MP3 audio frame structure:
461 // $aa $aa $aa $aa [$bb $bb] $cc...
462 // where $aa..$aa is the four-byte mpeg-audio header (below)
463 // $bb $bb is the optional 2-byte CRC
464 // and $cc... is the audio data
465
466 $head4 = substr($headerstring, 0, 4);
467 $head4_key = getid3_lib::PrintHexBytes($head4, true, false, false);
468 static $MPEGaudioHeaderDecodeCache = array();
469 if (isset($MPEGaudioHeaderDecodeCache[$head4_key])) {
470 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4_key];
471 } else {
472 $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
473 $MPEGaudioHeaderDecodeCache[$head4_key] = $MPEGheaderRawArray;
474 }
475
476 static $MPEGaudioHeaderValidCache = array();
477 if (!isset($MPEGaudioHeaderValidCache[$head4_key])) { // Not in cache
478 //$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
479 $MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
480 }
481
482 // shortcut
483 if (!isset($info['mpeg']['audio'])) {
484 $info['mpeg']['audio'] = array();
485 }
486 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
487
488 if ($MPEGaudioHeaderValidCache[$head4_key]) {
489 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
490 } else {
491 $this->error('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset);
492 return false;
493 }
494
495 if (!$FastMPEGheaderScan) {
496 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
497 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
498
499 $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
500 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
501 $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
502 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
503 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
504 $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
505 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
506 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
507 $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
508
509 $info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
510 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
511
512 if ($thisfile_mpeg_audio['protection']) {
513 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
514 }
515 }
516
517 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
518 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
519 $this->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1');
520 $thisfile_mpeg_audio['raw']['bitrate'] = 0;
521 }
522 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
523 $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
524
525 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
526 // only skip multiple frame check if free-format bitstream found at beginning of file
527 // otherwise is quite possibly simply corrupted data
528 $recursivesearch = false;
529 }
530
531 // For Layer 2 there are some combinations of bitrate and mode which are not allowed.
532 if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
533
534 $info['audio']['dataformat'] = 'mp2';
535 switch ($thisfile_mpeg_audio['channelmode']) {
536
537 case 'mono':
538 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
539 // these are ok
540 } else {
541 $this->error($thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
542 return false;
543 }
544 break;
545
546 case 'stereo':
547 case 'joint stereo':
548 case 'dual channel':
549 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
550 // these are ok
551 } else {
552 $this->error(intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
553 return false;
554 }
555 break;
556
557 }
558
559 }
560
561
562 if ($info['audio']['sample_rate'] > 0) {
563 $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
564 }
565
566 $nextframetestoffset = $offset + 1;
567 if ($thisfile_mpeg_audio['bitrate'] != 'free') {
568
569 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
570
571 if (isset($thisfile_mpeg_audio['framelength'])) {
572 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
573 } else {
574 $this->error('Frame at offset('.$offset.') is has an invalid frame length.');
575 return false;
576 }
577
578 }
579
580 $ExpectedNumberOfAudioBytes = 0;
581
582 ////////////////////////////////////////////////////////////////////////////////////
583 // Variable-bitrate headers
584
585 if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
586 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
587 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
588
589 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
590 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
591 $info['audio']['codec'] = 'Fraunhofer';
592
593 $SideInfoData = substr($headerstring, 4 + 2, 32);
594
595 $FraunhoferVBROffset = 36;
596
597 $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion
598 $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay
599 $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality
600 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
601 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
602 $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
603 $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
604 $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
605 $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames
606
607 $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
608
609 $previousbyteoffset = $offset;
610 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
611 $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
612 $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
613 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
614 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
615 $previousbyteoffset += $Fraunhofer_OffsetN;
616 }
617
618
619 } else {
620
621 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
622 // depending on MPEG layer and number of channels
623
624 $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
625 $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
626
627 if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
628 // 'Xing' is traditional Xing VBR frame
629 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
630 // 'Info' *can* legally be used to specify a VBR file as well, however.
631
632 // http://www.multiweb.cz/twoinches/MP3inside.htm
633 //00..03 = "Xing" or "Info"
634 //04..07 = Flags:
635 // 0x01 Frames Flag set if value for number of frames in file is stored
636 // 0x02 Bytes Flag set if value for filesize in bytes is stored
637 // 0x04 TOC Flag set if values for TOC are stored
638 // 0x08 VBR Scale Flag set if values for VBR scale is stored
639 //08..11 Frames: Number of frames in file (including the first Xing/Info one)
640 //12..15 Bytes: File length in Bytes
641 //16..115 TOC (Table of Contents):
642 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
643 // Each Byte has a value according this formula:
644 // (TOC[i] / 256) * fileLenInBytes
645 // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
646 // TOC[(60/240)*100] = TOC[25]
647 // and corresponding Byte in file is then approximately at:
648 // (TOC[25]/256) * 5000000
649 //116..119 VBR Scale
650
651
652 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
653 // if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
654 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
655 $thisfile_mpeg_audio['VBR_method'] = 'Xing';
656 // } else {
657 // $ScanAsCBR = true;
658 // $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
659 // }
660
661 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
662
663 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
664 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
665 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
666 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
667
668 if ($thisfile_mpeg_audio['xing_flags']['frames']) {
669 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4));
670 //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
671 }
672 if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
673 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
674 }
675
676 //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
677 //if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
678 if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
679 $used_filesize = 0;
680 if (!empty($thisfile_mpeg_audio['VBR_bytes'])) {
681 $used_filesize = $thisfile_mpeg_audio['VBR_bytes'];
682 } elseif (!empty($info['filesize'])) {
683 $used_filesize = $info['filesize'];
684 $used_filesize -= (isset($info['id3v2']['headerlength']) ? intval($info['id3v2']['headerlength']) : 0);
685 $used_filesize -= (isset($info['id3v1']) ? 128 : 0);
686 $used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0);
687 $this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes');
688 }
689
690 $framelengthfloat = $used_filesize / $thisfile_mpeg_audio['VBR_frames'];
691
692 if ($thisfile_mpeg_audio['layer'] == '1') {
693 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
694 //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
695 $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
696 } else {
697 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
698 //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
699 $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
700 }
701 $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
702 }
703
704 if ($thisfile_mpeg_audio['xing_flags']['toc']) {
705 $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
706 for ($i = 0; $i < 100; $i++) {
707 $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData[$i]);
708 }
709 }
710 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
711 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
712 }
713
714
715 // http://gabriel.mp3-tech.org/mp3infotag.html
716 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
717
718 // shortcut
719 $thisfile_mpeg_audio['LAME'] = array();
720 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
721
722
723 $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20);
724 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
725 $thisfile_mpeg_audio_lame['numeric_version'] = str_replace('LAME', '', $thisfile_mpeg_audio_lame['short_version']);
726 if (preg_match('#^LAME([0-9\\.a-z]+)#', $thisfile_mpeg_audio_lame['long_version'], $matches)) {
727 $thisfile_mpeg_audio_lame['short_version'] = $matches[0];
728 $thisfile_mpeg_audio_lame['numeric_version'] = $matches[1];
729 }
730 foreach (explode('.', $thisfile_mpeg_audio_lame['numeric_version']) as $key => $number) {
731 $thisfile_mpeg_audio_lame['integer_version'][$key] = intval($number);
732 }
733
734 //if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
735 if ((($thisfile_mpeg_audio_lame['integer_version'][0] * 1000) + $thisfile_mpeg_audio_lame['integer_version'][1]) >= 3090) { // cannot use string version compare, may have "LAME3.90" or "LAME3.100" -- see https://github.com/JamesHeinrich/getID3/issues/207
736
737 // extra 11 chars are not part of version string when LAMEtag present
738 unset($thisfile_mpeg_audio_lame['long_version']);
739
740 // It the LAME tag was only introduced in LAME v3.90
741 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
742
743 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
744 // are assuming a 'Xing' identifier offset of 0x24, which is the case for
745 // MPEG-1 non-mono, but not for other combinations
746 $LAMEtagOffsetContant = $VBRidOffset - 0x24;
747
748 // shortcuts
749 $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array());
750 $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD'];
751 $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
752 $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
753 $thisfile_mpeg_audio_lame['raw'] = array();
754 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
755
756 // byte $9B VBR Quality
757 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
758 // Actually overwrites original Xing bytes
759 unset($thisfile_mpeg_audio['VBR_scale']);
760 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
761
762 // bytes $9C-$A4 Encoder short VersionString
763 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
764
765 // byte $A5 Info Tag revision + VBR method
766 $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
767
768 $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
769 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
770 $thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
771 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
772
773 // byte $A6 Lowpass filter value
774 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
775
776 // bytes $A7-$AE Replay Gain
777 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
778 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
779 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
780 // LAME 3.94a16 and later - 9.23 fixed point
781 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
782 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
783 } else {
784 // LAME 3.94a15 and earlier - 32-bit floating point
785 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
786 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
787 }
788 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
789 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
790 } else {
791 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
792 }
793
794 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
795 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
796
797
798 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
799
800 $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
801 $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
802 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
803 $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
804 $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
805 $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
806 $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
807
808 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
809 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
810 }
811 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
812 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
813 } else {
814 unset($thisfile_mpeg_audio_lame_RGAD['track']);
815 }
816 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
817
818 $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
819 $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
820 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
821 $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
822 $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
823 $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
824 $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
825
826 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
827 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
828 }
829 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
830 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
831 } else {
832 unset($thisfile_mpeg_audio_lame_RGAD['album']);
833 }
834 if (empty($thisfile_mpeg_audio_lame_RGAD)) {
835 unset($thisfile_mpeg_audio_lame['RGAD']);
836 }
837
838
839 // byte $AF Encoding flags + ATH Type
840 $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
841 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10);
842 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
843 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40);
844 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80);
845 $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F;
846
847 // byte $B0 if ABR {specified bitrate} else {minimal bitrate}
848 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
849 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
850 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
851 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
852 // ignore
853 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
854 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
855 }
856
857 // bytes $B1-$B3 Encoder delays
858 $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
859 $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
860 $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF;
861
862 // byte $B4 Misc
863 $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
864 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03);
865 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
866 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
867 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
868 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
869 $thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
870 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
871 $thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
872
873 // byte $B5 MP3 Gain
874 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
875 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
876 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
877
878 // bytes $B6-$B7 Preset and surround info
879 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
880 // Reserved = ($PresetSurroundBytes & 0xC000);
881 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
882 $thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
883 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
884 $thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
885 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
886 $this->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');
887 }
888 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
889 // this may change if 3.90.4 ever comes out
890 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
891 }
892
893 // bytes $B8-$BB MusicLength
894 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
895 $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
896
897 // bytes $BC-$BD MusicCRC
898 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
899
900 // bytes $BE-$BF CRC-16 of Info Tag
901 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
902
903
904 // LAME CBR
905 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
906
907 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
908 $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
909 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
910 //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
911 // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
912 //}
913
914 }
915
916 }
917 }
918
919 } else {
920
921 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
922 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
923 if ($recursivesearch) {
924 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
925 if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
926 $recursivesearch = false;
927 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
928 }
929 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
930 $this->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');
931 }
932 }
933
934 }
935
936 }
937
938 if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
939 if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
940 if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) {
941 // ignore, audio data is broken into chunks so will always be data "missing"
942 }
943 elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
944 $this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
945 }
946 else {
947 $this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');
948 }
949 } else {
950 if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
951 // $prenullbytefileoffset = $this->ftell();
952 // $this->fseek($info['avdataend']);
953 // $PossibleNullByte = $this->fread(1);
954 // $this->fseek($prenullbytefileoffset);
955 // if ($PossibleNullByte === "\x00") {
956 $info['avdataend']--;
957 // $this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored');
958 // } else {
959 // $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
960 // }
961 } else {
962 $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
963 }
964 }
965 }
966
967 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
968 if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
969 $framebytelength = $this->FreeFormatFrameLength($offset, true);
970 if ($framebytelength > 0) {
971 $thisfile_mpeg_audio['framelength'] = $framebytelength;
972 if ($thisfile_mpeg_audio['layer'] == '1') {
973 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
974 $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
975 } else {
976 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
977 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
978 }
979 } else {
980 $this->error('Error calculating frame length of free-format MP3 without Xing/LAME header');
981 }
982 }
983 }
984
985 if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
986 switch ($thisfile_mpeg_audio['bitrate_mode']) {
987 case 'vbr':
988 case 'abr':
989 $bytes_per_frame = 1152;
990 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
991 $bytes_per_frame = 384;
992 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
993 $bytes_per_frame = 576;
994 }
995 $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
996 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
997 $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
998 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
999 }
1000 break;
1001 }
1002 }
1003
1004 // End variable-bitrate headers
1005 ////////////////////////////////////////////////////////////////////////////////////
1006
1007 if ($recursivesearch) {
1008
1009 if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
1010 return false;
1011 }
1012
1013 }
1014
1015
1016 //if (false) {
1017 // // experimental side info parsing section - not returning anything useful yet
1018 //
1019 // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
1020 // $SideInfoOffset = 0;
1021 //
1022 // if ($thisfile_mpeg_audio['version'] == '1') {
1023 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1024 // // MPEG-1 (mono)
1025 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1026 // $SideInfoOffset += 9;
1027 // $SideInfoOffset += 5;
1028 // } else {
1029 // // MPEG-1 (stereo, joint-stereo, dual-channel)
1030 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1031 // $SideInfoOffset += 9;
1032 // $SideInfoOffset += 3;
1033 // }
1034 // } else { // 2 or 2.5
1035 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1036 // // MPEG-2, MPEG-2.5 (mono)
1037 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1038 // $SideInfoOffset += 8;
1039 // $SideInfoOffset += 1;
1040 // } else {
1041 // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
1042 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1043 // $SideInfoOffset += 8;
1044 // $SideInfoOffset += 2;
1045 // }
1046 // }
1047 //
1048 // if ($thisfile_mpeg_audio['version'] == '1') {
1049 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1050 // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
1051 // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1052 // $SideInfoOffset += 2;
1053 // }
1054 // }
1055 // }
1056 // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
1057 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1058 // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
1059 // $SideInfoOffset += 12;
1060 // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1061 // $SideInfoOffset += 9;
1062 // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1063 // $SideInfoOffset += 8;
1064 // if ($thisfile_mpeg_audio['version'] == '1') {
1065 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1066 // $SideInfoOffset += 4;
1067 // } else {
1068 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1069 // $SideInfoOffset += 9;
1070 // }
1071 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1072 // $SideInfoOffset += 1;
1073 //
1074 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
1075 //
1076 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
1077 // $SideInfoOffset += 2;
1078 // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1079 // $SideInfoOffset += 1;
1080 //
1081 // for ($region = 0; $region < 2; $region++) {
1082 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1083 // $SideInfoOffset += 5;
1084 // }
1085 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
1086 //
1087 // for ($window = 0; $window < 3; $window++) {
1088 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1089 // $SideInfoOffset += 3;
1090 // }
1091 //
1092 // } else {
1093 //
1094 // for ($region = 0; $region < 3; $region++) {
1095 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1096 // $SideInfoOffset += 5;
1097 // }
1098 //
1099 // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1100 // $SideInfoOffset += 4;
1101 // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1102 // $SideInfoOffset += 3;
1103 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
1104 // }
1105 //
1106 // if ($thisfile_mpeg_audio['version'] == '1') {
1107 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1108 // $SideInfoOffset += 1;
1109 // }
1110 // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1111 // $SideInfoOffset += 1;
1112 // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1113 // $SideInfoOffset += 1;
1114 // }
1115 // }
1116 //}
1117
1118 return true;
1119 }
1120
1121 /**
1122 * @param int $offset
1123 * @param int $nextframetestoffset
1124 * @param bool $ScanAsCBR
1125 *
1126 * @return bool
1127 */
1128 public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) {
1129 $info = &$this->getid3->info;
1130 $firstframetestarray = array('error' => array(), 'warning'=> array(), 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
1131 $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
1132
1133 for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
1134 // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
1135 if (($nextframetestoffset + 4) >= $info['avdataend']) {
1136 // end of file
1137 return true;
1138 }
1139
1140 $nextframetestarray = array('error' => array(), 'warning' => array(), 'avdataend' => $info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1141 if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
1142 if ($ScanAsCBR) {
1143 // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
1144 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
1145 return false;
1146 }
1147 }
1148
1149
1150 // next frame is OK, get ready to check the one after that
1151 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1152 $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
1153 } else {
1154 $this->error('Frame at offset ('.$offset.') is has an invalid frame length.');
1155 return false;
1156 }
1157
1158 } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
1159
1160 // 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
1161 return true;
1162
1163 } else {
1164
1165 // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
1166 $this->warning('Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.');
1167
1168 return false;
1169 }
1170 }
1171 return true;
1172 }
1173
1174 /**
1175 * @param int $offset
1176 * @param bool $deepscan
1177 *
1178 * @return int|false
1179 */
1180 public function FreeFormatFrameLength($offset, $deepscan=false) {
1181 $info = &$this->getid3->info;
1182
1183 $this->fseek($offset);
1184 $MPEGaudioData = $this->fread(32768);
1185
1186 $SyncPattern1 = substr($MPEGaudioData, 0, 4);
1187 // may be different pattern due to padding
1188 $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) | 0x02).$SyncPattern1[3];
1189 if ($SyncPattern2 === $SyncPattern1) {
1190 $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) & 0xFD).$SyncPattern1[3];
1191 }
1192
1193 $framelength = false;
1194 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1195 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1196 if ($framelength1 > 4) {
1197 $framelength = $framelength1;
1198 }
1199 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1200 $framelength = $framelength2;
1201 }
1202 if (!$framelength) {
1203
1204 // LAME 3.88 has a different value for modeextension on the first frame vs the rest
1205 $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
1206 $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
1207
1208 if ($framelength1 > 4) {
1209 $framelength = $framelength1;
1210 }
1211 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1212 $framelength = $framelength2;
1213 }
1214 if (!$framelength) {
1215 $this->error('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset);
1216 return false;
1217 } else {
1218 $this->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)');
1219 $info['audio']['codec'] = 'LAME';
1220 $info['audio']['encoder'] = 'LAME3.88';
1221 $SyncPattern1 = substr($SyncPattern1, 0, 3);
1222 $SyncPattern2 = substr($SyncPattern2, 0, 3);
1223 }
1224 }
1225
1226 if ($deepscan) {
1227
1228 $ActualFrameLengthValues = array();
1229 $nextoffset = $offset + $framelength;
1230 while ($nextoffset < ($info['avdataend'] - 6)) {
1231 $this->fseek($nextoffset - 1);
1232 $NextSyncPattern = $this->fread(6);
1233 if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
1234 // good - found where expected
1235 $ActualFrameLengthValues[] = $framelength;
1236 } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
1237 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1238 $ActualFrameLengthValues[] = ($framelength - 1);
1239 $nextoffset--;
1240 } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
1241 // ok - found one byte later than expected (last frame was padded, first frame wasn't)
1242 $ActualFrameLengthValues[] = ($framelength + 1);
1243 $nextoffset++;
1244 } else {
1245 $this->error('Did not find expected free-format sync pattern at offset '.$nextoffset);
1246 return false;
1247 }
1248 $nextoffset += $framelength;
1249 }
1250 if (count($ActualFrameLengthValues) > 0) {
1251 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1252 }
1253 }
1254 return $framelength;
1255 }
1256
1257 /**
1258 * @return bool
1259 */
1260 public function getOnlyMPEGaudioInfoBruteForce() {
1261 $MPEGaudioHeaderDecodeCache = array();
1262 $MPEGaudioHeaderValidCache = array();
1263 $MPEGaudioHeaderLengthCache = array();
1264 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1265 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1266 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1267 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1268 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1269 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1270 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1271 $LongMPEGversionLookup = array();
1272 $LongMPEGlayerLookup = array();
1273 $LongMPEGbitrateLookup = array();
1274 $LongMPEGpaddingLookup = array();
1275 $LongMPEGfrequencyLookup = array();
1276 $Distribution['bitrate'] = array();
1277 $Distribution['frequency'] = array();
1278 $Distribution['layer'] = array();
1279 $Distribution['version'] = array();
1280 $Distribution['padding'] = array();
1281
1282 $info = &$this->getid3->info;
1283 $this->fseek($info['avdataoffset']);
1284
1285 $max_frames_scan = 5000;
1286 $frames_scanned = 0;
1287
1288 $previousvalidframe = $info['avdataoffset'];
1289 while ($this->ftell() < $info['avdataend']) {
1290 set_time_limit(30);
1291 $head4 = $this->fread(4);
1292 if (strlen($head4) < 4) {
1293 break;
1294 }
1295 if ($head4[0] != "\xFF") {
1296 for ($i = 1; $i < 4; $i++) {
1297 if ($head4[$i] == "\xFF") {
1298 $this->fseek($i - 4, SEEK_CUR);
1299 continue 2;
1300 }
1301 }
1302 continue;
1303 }
1304 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1305 $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
1306 }
1307 if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1308 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
1309 }
1310 if ($MPEGaudioHeaderValidCache[$head4]) {
1311
1312 if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
1313 $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
1314 $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
1315 $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
1316 $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
1317 $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
1318 $MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
1319 $LongMPEGbitrateLookup[$head4],
1320 $LongMPEGversionLookup[$head4],
1321 $LongMPEGlayerLookup[$head4],
1322 $LongMPEGpaddingLookup[$head4],
1323 $LongMPEGfrequencyLookup[$head4]);
1324 }
1325 if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
1326 $WhereWeWere = $this->ftell();
1327 $this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
1328 $next4 = $this->fread(4);
1329 if ($next4[0] == "\xFF") {
1330 if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
1331 $MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
1332 }
1333 if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1334 $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
1335 }
1336 if ($MPEGaudioHeaderValidCache[$next4]) {
1337 $this->fseek(-4, SEEK_CUR);
1338
1339 $Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]] = isset($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]) ? ++$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]] : 1;
1340 $Distribution['layer'][$LongMPEGlayerLookup[$head4]] = isset($Distribution['layer'][$LongMPEGlayerLookup[$head4]]) ? ++$Distribution['layer'][$LongMPEGlayerLookup[$head4]] : 1;
1341 $Distribution['version'][$LongMPEGversionLookup[$head4]] = isset($Distribution['version'][$LongMPEGversionLookup[$head4]]) ? ++$Distribution['version'][$LongMPEGversionLookup[$head4]] : 1;
1342 $Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])] = isset($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]) ? ++$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])] : 1;
1343 $Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]] = isset($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]) ? ++$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]] : 1;
1344 if (++$frames_scanned >= $max_frames_scan) {
1345 $pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
1346 $this->warning('too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.');
1347 foreach ($Distribution as $key1 => $value1) {
1348 foreach ($value1 as $key2 => $value2) {
1349 $Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
1350 }
1351 }
1352 break;
1353 }
1354 continue;
1355 }
1356 }
1357 unset($next4);
1358 $this->fseek($WhereWeWere - 3);
1359 }
1360
1361 }
1362 }
1363 foreach ($Distribution as $key => $value) {
1364 ksort($Distribution[$key], SORT_NUMERIC);
1365 }
1366 ksort($Distribution['version'], SORT_STRING);
1367 $info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
1368 $info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
1369 $info['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
1370 $info['mpeg']['audio']['version_distribution'] = $Distribution['version'];
1371 $info['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
1372 if (count($Distribution['version']) > 1) {
1373 $this->error('Corrupt file - more than one MPEG version detected');
1374 }
1375 if (count($Distribution['layer']) > 1) {
1376 $this->error('Corrupt file - more than one MPEG layer detected');
1377 }
1378 if (count($Distribution['frequency']) > 1) {
1379 $this->error('Corrupt file - more than one MPEG sample rate detected');
1380 }
1381
1382
1383 $bittotal = 0;
1384 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1385 if ($bitratevalue != 'free') {
1386 $bittotal += ($bitratevalue * $bitratecount);
1387 }
1388 }
1389 $info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
1390 if ($info['mpeg']['audio']['frame_count'] == 0) {
1391 $this->error('no MPEG audio frames found');
1392 return false;
1393 }
1394 $info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']);
1395 $info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
1396 $info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
1397
1398 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1399 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1400 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1401 $info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
1402 $info['fileformat'] = $info['audio']['dataformat'];
1403
1404 return true;
1405 }
1406
1407 /**
1408 * @param int $avdataoffset
1409 * @param bool $BitrateHistogram
1410 *
1411 * @return bool
1412 */
1413 public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) {
1414 // looks for synch, decodes MPEG audio header
1415
1416 $info = &$this->getid3->info;
1417
1418 static $MPEGaudioVersionLookup;
1419 static $MPEGaudioLayerLookup;
1420 static $MPEGaudioBitrateLookup;
1421 if (empty($MPEGaudioVersionLookup)) {
1422 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1423 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1424 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1425 }
1426
1427 $this->fseek($avdataoffset);
1428 $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset);
1429 if ($sync_seek_buffer_size <= 0) {
1430 $this->error('Invalid $sync_seek_buffer_size at offset '.$avdataoffset);
1431 return false;
1432 }
1433 $header = $this->fread($sync_seek_buffer_size);
1434 $sync_seek_buffer_size = strlen($header);
1435 $SynchSeekOffset = 0;
1436 while ($SynchSeekOffset < $sync_seek_buffer_size) {
1437 if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) {
1438
1439 if ($SynchSeekOffset > $sync_seek_buffer_size) {
1440 // if a synch's not found within the first 128k bytes, then give up
1441 $this->error('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB');
1442 if (isset($info['audio']['bitrate'])) {
1443 unset($info['audio']['bitrate']);
1444 }
1445 if (isset($info['mpeg']['audio'])) {
1446 unset($info['mpeg']['audio']);
1447 }
1448 if (empty($info['mpeg'])) {
1449 unset($info['mpeg']);
1450 }
1451 return false;
1452
1453 } elseif (feof($this->getid3->fp)) {
1454
1455 $this->error('Could not find valid MPEG audio synch before end of file');
1456 if (isset($info['audio']['bitrate'])) {
1457 unset($info['audio']['bitrate']);
1458 }
1459 if (isset($info['mpeg']['audio'])) {
1460 unset($info['mpeg']['audio']);
1461 }
1462 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) {
1463 unset($info['mpeg']);
1464 }
1465 return false;
1466 }
1467 }
1468
1469 if (($SynchSeekOffset + 1) >= strlen($header)) {
1470 $this->error('Could not find valid MPEG synch before end of file');
1471 return false;
1472 }
1473
1474 if (($header[$SynchSeekOffset] == "\xFF") && ($header[($SynchSeekOffset + 1)] > "\xE0")) { // synch detected
1475 $FirstFrameAVDataOffset = null;
1476 if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
1477 $FirstFrameThisfileInfo = $info;
1478 $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
1479 if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) {
1480 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1481 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1482 unset($FirstFrameThisfileInfo);
1483 }
1484 }
1485
1486 $dummy = $info; // only overwrite real data if valid header found
1487 if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
1488 $info = $dummy;
1489 $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1490 switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
1491 case '':
1492 case 'id3':
1493 case 'ape':
1494 case 'mp3':
1495 $info['fileformat'] = 'mp3';
1496 $info['audio']['dataformat'] = 'mp3';
1497 break;
1498 }
1499 if (isset($FirstFrameThisfileInfo) && isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1500 if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
1501 // If there is garbage data between a valid VBR header frame and a sequence
1502 // of valid MPEG-audio frames the VBR data is no longer discarded.
1503 $info = $FirstFrameThisfileInfo;
1504 $info['avdataoffset'] = $FirstFrameAVDataOffset;
1505 $info['fileformat'] = 'mp3';
1506 $info['audio']['dataformat'] = 'mp3';
1507 $dummy = $info;
1508 unset($dummy['mpeg']['audio']);
1509 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1510 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
1511 if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) {
1512 $info = $dummy;
1513 $info['avdataoffset'] = $GarbageOffsetEnd;
1514 $this->warning('apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd);
1515 } else {
1516 $this->warning('using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')');
1517 }
1518 }
1519 }
1520 if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
1521 // VBR file with no VBR header
1522 $BitrateHistogram = true;
1523 }
1524
1525 if ($BitrateHistogram) {
1526
1527 $info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1528 $info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
1529
1530 if ($info['mpeg']['audio']['version'] == '1') {
1531 if ($info['mpeg']['audio']['layer'] == 3) {
1532 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
1533 } elseif ($info['mpeg']['audio']['layer'] == 2) {
1534 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
1535 } elseif ($info['mpeg']['audio']['layer'] == 1) {
1536 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1537 }
1538 } elseif ($info['mpeg']['audio']['layer'] == 1) {
1539 $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);
1540 } else {
1541 $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);
1542 }
1543
1544 $dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1545 $synchstartoffset = $info['avdataoffset'];
1546 $this->fseek($info['avdataoffset']);
1547
1548 // you can play with these numbers:
1549 $max_frames_scan = 50000;
1550 $max_scan_segments = 10;
1551
1552 // don't play with these numbers:
1553 $FastMode = false;
1554 $SynchErrorsFound = 0;
1555 $frames_scanned = 0;
1556 $this_scan_segment = 0;
1557 $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
1558 $pct_data_scanned = 0;
1559 for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
1560 $frames_scanned_this_segment = 0;
1561 if ($this->ftell() >= $info['avdataend']) {
1562 break;
1563 }
1564 $scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
1565 if ($current_segment > 0) {
1566 $this->fseek($scan_start_offset[$current_segment]);
1567 $buffer_4k = $this->fread(4096);
1568 for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
1569 if (($buffer_4k[$j] == "\xFF") && ($buffer_4k[($j + 1)] > "\xE0")) { // synch detected
1570 if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
1571 $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
1572 if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) {
1573 $scan_start_offset[$current_segment] += $j;
1574 break;
1575 }
1576 }
1577 }
1578 }
1579 }
1580 $synchstartoffset = $scan_start_offset[$current_segment];
1581 while (($synchstartoffset < $info['avdataend']) && $this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) {
1582 $FastMode = true;
1583 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1584
1585 if (empty($dummy['mpeg']['audio']['framelength'])) {
1586 $SynchErrorsFound++;
1587 $synchstartoffset++;
1588 } else {
1589 getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
1590 getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
1591 getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
1592 $synchstartoffset += $dummy['mpeg']['audio']['framelength'];
1593 }
1594 $frames_scanned++;
1595 if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
1596 $this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']);
1597 if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
1598 // file likely contains < $max_frames_scan, just scan as one segment
1599 $max_scan_segments = 1;
1600 $frames_scan_per_segment = $max_frames_scan;
1601 } else {
1602 $pct_data_scanned += $this_pct_scanned;
1603 break;
1604 }
1605 }
1606 }
1607 }
1608 if ($pct_data_scanned > 0) {
1609 $this->warning('too many MPEG audio frames to scan, only scanned '.$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.');
1610 foreach ($info['mpeg']['audio'] as $key1 => $value1) {
1611 if (!preg_match('#_distribution$#i', $key1)) {
1612 continue;
1613 }
1614 foreach ($value1 as $key2 => $value2) {
1615 $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
1616 }
1617 }
1618 }
1619
1620 if ($SynchErrorsFound > 0) {
1621 $this->warning('Found '.$SynchErrorsFound.' synch errors in histogram analysis');
1622 //return false;
1623 }
1624
1625 $bittotal = 0;
1626 $framecounter = 0;
1627 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1628 $framecounter += $bitratecount;
1629 if ($bitratevalue != 'free') {
1630 $bittotal += ($bitratevalue * $bitratecount);
1631 }
1632 }
1633 if ($framecounter == 0) {
1634 $this->error('Corrupt MP3 file: framecounter == zero');
1635 return false;
1636 }
1637 $info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
1638 $info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
1639
1640 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1641
1642
1643 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1644 $distinct_bitrates = 0;
1645 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
1646 if ($bitrate_count > 0) {
1647 $distinct_bitrates++;
1648 }
1649 }
1650 if ($distinct_bitrates > 1) {
1651 $info['mpeg']['audio']['bitrate_mode'] = 'vbr';
1652 } else {
1653 $info['mpeg']['audio']['bitrate_mode'] = 'cbr';
1654 }
1655 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1656
1657 }
1658
1659 break; // exit while()
1660 }
1661 }
1662
1663 $SynchSeekOffset++;
1664 if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
1665 // end of file/data
1666
1667 if (empty($info['mpeg']['audio'])) {
1668
1669 $this->error('could not find valid MPEG synch before end of file');
1670 if (isset($info['audio']['bitrate'])) {
1671 unset($info['audio']['bitrate']);
1672 }
1673 if (isset($info['mpeg']['audio'])) {
1674 unset($info['mpeg']['audio']);
1675 }
1676 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
1677 unset($info['mpeg']);
1678 }
1679 return false;
1680
1681 }
1682 break;
1683 }
1684
1685 }
1686 $info['audio']['channels'] = $info['mpeg']['audio']['channels'];
1687 $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
1688 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1689 return true;
1690 }
1691
1692 /**
1693 * @return array
1694 */
1695 public static function MPEGaudioVersionArray() {
1696 static $MPEGaudioVersion = array('2.5', false, '2', '1');
1697 return $MPEGaudioVersion;
1698 }
1699
1700 /**
1701 * @return array
1702 */
1703 public static function MPEGaudioLayerArray() {
1704 static $MPEGaudioLayer = array(false, 3, 2, 1);
1705 return $MPEGaudioLayer;
1706 }
1707
1708 /**
1709 * @return array
1710 */
1711 public static function MPEGaudioBitrateArray() {
1712 static $MPEGaudioBitrate;
1713 if (empty($MPEGaudioBitrate)) {
1714 $MPEGaudioBitrate = array (
1715 '1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1716 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1717 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1718 ),
1719
1720 '2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1721 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
1722 )
1723 );
1724 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1725 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
1726 }
1727 return $MPEGaudioBitrate;
1728 }
1729
1730 /**
1731 * @return array
1732 */
1733 public static function MPEGaudioFrequencyArray() {
1734 static $MPEGaudioFrequency;
1735 if (empty($MPEGaudioFrequency)) {
1736 $MPEGaudioFrequency = array (
1737 '1' => array(44100, 48000, 32000),
1738 '2' => array(22050, 24000, 16000),
1739 '2.5' => array(11025, 12000, 8000)
1740 );
1741 }
1742 return $MPEGaudioFrequency;
1743 }
1744
1745 /**
1746 * @return array
1747 */
1748 public static function MPEGaudioChannelModeArray() {
1749 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1750 return $MPEGaudioChannelMode;
1751 }
1752
1753 /**
1754 * @return array
1755 */
1756 public static function MPEGaudioModeExtensionArray() {
1757 static $MPEGaudioModeExtension;
1758 if (empty($MPEGaudioModeExtension)) {
1759 $MPEGaudioModeExtension = array (
1760 1 => array('4-31', '8-31', '12-31', '16-31'),
1761 2 => array('4-31', '8-31', '12-31', '16-31'),
1762 3 => array('', 'IS', 'MS', 'IS+MS')
1763 );
1764 }
1765 return $MPEGaudioModeExtension;
1766 }
1767
1768 /**
1769 * @return array
1770 */
1771 public static function MPEGaudioEmphasisArray() {
1772 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1773 return $MPEGaudioEmphasis;
1774 }
1775
1776 /**
1777 * @param string $head4
1778 * @param bool $allowBitrate15
1779 *
1780 * @return bool
1781 */
1782 public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
1783 return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
1784 }
1785
1786 /**
1787 * @param array $rawarray
1788 * @param bool $echoerrors
1789 * @param bool $allowBitrate15
1790 *
1791 * @return bool
1792 */
1793 public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
1794 if (!isset($rawarray['synch']) || ($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
1795 return false;
1796 }
1797
1798 static $MPEGaudioVersionLookup;
1799 static $MPEGaudioLayerLookup;
1800 static $MPEGaudioBitrateLookup;
1801 static $MPEGaudioFrequencyLookup;
1802 static $MPEGaudioChannelModeLookup;
1803 static $MPEGaudioModeExtensionLookup;
1804 static $MPEGaudioEmphasisLookup;
1805 if (empty($MPEGaudioVersionLookup)) {
1806 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1807 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1808 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1809 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1810 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1811 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1812 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1813 }
1814
1815 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1816 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1817 } else {
1818 echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
1819 return false;
1820 }
1821 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1822 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1823 } else {
1824 echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
1825 return false;
1826 }
1827 if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
1828 echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
1829 if ($rawarray['bitrate'] == 15) {
1830 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1831 // let it go through here otherwise file will not be identified
1832 if (!$allowBitrate15) {
1833 return false;
1834 }
1835 } else {
1836 return false;
1837 }
1838 }
1839 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
1840 echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
1841 return false;
1842 }
1843 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
1844 echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
1845 return false;
1846 }
1847 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
1848 echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
1849 return false;
1850 }
1851 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
1852 echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
1853 return false;
1854 }
1855 // These are just either set or not set, you can't mess that up :)
1856 // $rawarray['protection'];
1857 // $rawarray['padding'];
1858 // $rawarray['private'];
1859 // $rawarray['copyright'];
1860 // $rawarray['original'];
1861
1862 return true;
1863 }
1864
1865 /**
1866 * @param string $Header4Bytes
1867 *
1868 * @return array|false
1869 */
1870 public static function MPEGaudioHeaderDecode($Header4Bytes) {
1871 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
1872 // A - Frame sync (all bits set)
1873 // B - MPEG Audio version ID
1874 // C - Layer description
1875 // D - Protection bit
1876 // E - Bitrate index
1877 // F - Sampling rate frequency index
1878 // G - Padding bit
1879 // H - Private bit
1880 // I - Channel Mode
1881 // J - Mode extension (Only if Joint stereo)
1882 // K - Copyright
1883 // L - Original
1884 // M - Emphasis
1885
1886 if (strlen($Header4Bytes) != 4) {
1887 return false;
1888 }
1889
1890 $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
1891 $MPEGrawHeader['version'] = (ord($Header4Bytes[1]) & 0x18) >> 3; // BB
1892 $MPEGrawHeader['layer'] = (ord($Header4Bytes[1]) & 0x06) >> 1; // CC
1893 $MPEGrawHeader['protection'] = (ord($Header4Bytes[1]) & 0x01); // D
1894 $MPEGrawHeader['bitrate'] = (ord($Header4Bytes[2]) & 0xF0) >> 4; // EEEE
1895 $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes[2]) & 0x0C) >> 2; // FF
1896 $MPEGrawHeader['padding'] = (ord($Header4Bytes[2]) & 0x02) >> 1; // G
1897 $MPEGrawHeader['private'] = (ord($Header4Bytes[2]) & 0x01); // H
1898 $MPEGrawHeader['channelmode'] = (ord($Header4Bytes[3]) & 0xC0) >> 6; // II
1899 $MPEGrawHeader['modeextension'] = (ord($Header4Bytes[3]) & 0x30) >> 4; // JJ
1900 $MPEGrawHeader['copyright'] = (ord($Header4Bytes[3]) & 0x08) >> 3; // K
1901 $MPEGrawHeader['original'] = (ord($Header4Bytes[3]) & 0x04) >> 2; // L
1902 $MPEGrawHeader['emphasis'] = (ord($Header4Bytes[3]) & 0x03); // MM
1903
1904 return $MPEGrawHeader;
1905 }
1906
1907 /**
1908 * @param int|string $bitrate
1909 * @param string $version
1910 * @param string $layer
1911 * @param bool $padding
1912 * @param int $samplerate
1913 *
1914 * @return int|false
1915 */
1916 public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) {
1917 static $AudioFrameLengthCache = array();
1918
1919 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
1920 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
1921 if ($bitrate != 'free') {
1922
1923 if ($version == '1') {
1924
1925 if ($layer == '1') {
1926
1927 // For Layer I slot is 32 bits long
1928 $FrameLengthCoefficient = 48;
1929 $SlotLength = 4;
1930
1931 } else { // Layer 2 / 3
1932
1933 // for Layer 2 and Layer 3 slot is 8 bits long.
1934 $FrameLengthCoefficient = 144;
1935 $SlotLength = 1;
1936
1937 }
1938
1939 } else { // MPEG-2 / MPEG-2.5
1940
1941 if ($layer == '1') {
1942
1943 // For Layer I slot is 32 bits long
1944 $FrameLengthCoefficient = 24;
1945 $SlotLength = 4;
1946
1947 } elseif ($layer == '2') {
1948
1949 // for Layer 2 and Layer 3 slot is 8 bits long.
1950 $FrameLengthCoefficient = 144;
1951 $SlotLength = 1;
1952
1953 } else { // layer 3
1954
1955 // for Layer 2 and Layer 3 slot is 8 bits long.
1956 $FrameLengthCoefficient = 72;
1957 $SlotLength = 1;
1958
1959 }
1960
1961 }
1962
1963 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
1964 if ($samplerate > 0) {
1965 $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
1966 $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
1967 if ($padding) {
1968 $NewFramelength += $SlotLength;
1969 }
1970 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
1971 }
1972 }
1973 }
1974 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
1975 }
1976
1977 /**
1978 * @param float|int $bit_rate
1979 *
1980 * @return int|float|string
1981 */
1982 public static function ClosestStandardMP3Bitrate($bit_rate) {
1983 static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
1984 static $bit_rate_table = array (0=>'-');
1985 $round_bit_rate = intval(round($bit_rate, -3));
1986 if (!isset($bit_rate_table[$round_bit_rate])) {
1987 if ($round_bit_rate > max($standard_bit_rates)) {
1988 $bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate));
1989 } else {
1990 $bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
1991 foreach ($standard_bit_rates as $standard_bit_rate) {
1992 if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
1993 break;
1994 }
1995 $bit_rate_table[$round_bit_rate] = $standard_bit_rate;
1996 }
1997 }
1998 }
1999 return $bit_rate_table[$round_bit_rate];
2000 }
2001
2002 /**
2003 * @param string $version
2004 * @param string $channelmode
2005 *
2006 * @return int
2007 */
2008 public static function XingVBRidOffset($version, $channelmode) {
2009 static $XingVBRidOffsetCache = array();
2010 if (empty($XingVBRidOffsetCache)) {
2011 $XingVBRidOffsetCache = array (
2012 '1' => array ('mono' => 0x15, // 4 + 17 = 21
2013 'stereo' => 0x24, // 4 + 32 = 36
2014 'joint stereo' => 0x24,
2015 'dual channel' => 0x24
2016 ),
2017
2018 '2' => array ('mono' => 0x0D, // 4 + 9 = 13
2019 'stereo' => 0x15, // 4 + 17 = 21
2020 'joint stereo' => 0x15,
2021 'dual channel' => 0x15
2022 ),
2023
2024 '2.5' => array ('mono' => 0x15,
2025 'stereo' => 0x15,
2026 'joint stereo' => 0x15,
2027 'dual channel' => 0x15
2028 )
2029 );
2030 }
2031 return $XingVBRidOffsetCache[$version][$channelmode];
2032 }
2033
2034 /**
2035 * @param int $VBRmethodID
2036 *
2037 * @return string
2038 */
2039 public static function LAMEvbrMethodLookup($VBRmethodID) {
2040 static $LAMEvbrMethodLookup = array(
2041 0x00 => 'unknown',
2042 0x01 => 'cbr',
2043 0x02 => 'abr',
2044 0x03 => 'vbr-old / vbr-rh',
2045 0x04 => 'vbr-new / vbr-mtrh',
2046 0x05 => 'vbr-mt',
2047 0x06 => 'vbr (full vbr method 4)',
2048 0x08 => 'cbr (constant bitrate 2 pass)',
2049 0x09 => 'abr (2 pass)',
2050 0x0F => 'reserved'
2051 );
2052 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
2053 }
2054
2055 /**
2056 * @param int $StereoModeID
2057 *
2058 * @return string
2059 */
2060 public static function LAMEmiscStereoModeLookup($StereoModeID) {
2061 static $LAMEmiscStereoModeLookup = array(
2062 0 => 'mono',
2063 1 => 'stereo',
2064 2 => 'dual mono',
2065 3 => 'joint stereo',
2066 4 => 'forced stereo',
2067 5 => 'auto',
2068 6 => 'intensity stereo',
2069 7 => 'other'
2070 );
2071 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
2072 }
2073
2074 /**
2075 * @param int $SourceSampleFrequencyID
2076 *
2077 * @return string
2078 */
2079 public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
2080 static $LAMEmiscSourceSampleFrequencyLookup = array(
2081 0 => '<= 32 kHz',
2082 1 => '44.1 kHz',
2083 2 => '48 kHz',
2084 3 => '> 48kHz'
2085 );
2086 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
2087 }
2088
2089 /**
2090 * @param int $SurroundInfoID
2091 *
2092 * @return string
2093 */
2094 public static function LAMEsurroundInfoLookup($SurroundInfoID) {
2095 static $LAMEsurroundInfoLookup = array(
2096 0 => 'no surround info',
2097 1 => 'DPL encoding',
2098 2 => 'DPL2 encoding',
2099 3 => 'Ambisonic encoding'
2100 );
2101 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
2102 }
2103
2104 /**
2105 * @param array $LAMEtag
2106 *
2107 * @return string
2108 */
2109 public static function LAMEpresetUsedLookup($LAMEtag) {
2110
2111 if ($LAMEtag['preset_used_id'] == 0) {
2112 // no preset used (LAME >=3.93)
2113 // no preset recorded (LAME <3.93)
2114 return '';
2115 }
2116 $LAMEpresetUsedLookup = array();
2117
2118 ///// THIS PART CANNOT BE STATIC .
2119 for ($i = 8; $i <= 320; $i++) {
2120 switch ($LAMEtag['vbr_method']) {
2121 case 'cbr':
2122 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
2123 break;
2124 case 'abr':
2125 default: // other VBR modes shouldn't be here(?)
2126 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
2127 break;
2128 }
2129 }
2130
2131 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
2132
2133 // named alt-presets
2134 $LAMEpresetUsedLookup[1000] = '--r3mix';
2135 $LAMEpresetUsedLookup[1001] = '--alt-preset standard';
2136 $LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
2137 $LAMEpresetUsedLookup[1003] = '--alt-preset insane';
2138 $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
2139 $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
2140 $LAMEpresetUsedLookup[1006] = '--alt-preset medium';
2141 $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
2142
2143 // LAME 3.94 additions/changes
2144 $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
2145 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
2146
2147 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
2148 $LAMEpresetUsedLookup[410] = '-V9';
2149 $LAMEpresetUsedLookup[420] = '-V8';
2150 $LAMEpresetUsedLookup[440] = '-V6';
2151 $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
2152 $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
2153 $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
2154 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
2155 $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
2156 $LAMEpresetUsedLookup[490] = '-V1';
2157 $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
2158
2159 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
2160 }
2161
2162 }
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