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