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 /////////////////////////////////////////////////////////////////
10 // module.audio.mp3.php //
11 // module for analyzing MP3 files //
12 // dependencies: NONE //
14 /////////////////////////////////////////////////////////////////
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
21 define('GETID3_MP3_VALID_CHECK_FRAMES', 35);
24 class getid3_mp3 extends getid3_handler
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
29 public function Analyze() {
30 $info = &$this->getid3->info;
32 $initialOffset = $info['avdataoffset'];
34 if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
35 if ($this->allow_bruteforce) {
36 $info['error'][] = 'Rescanning file in BruteForce mode';
37 $this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info);
42 if (isset($info['mpeg']['audio']['bitrate_mode'])) {
43 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
46 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
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.', ';
54 $synchoffsetwarning .= '(should be at beginning of file, ';
56 $synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
57 if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
59 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
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 $CurrentDataLAMEversionString = 'LAME3.';
65 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
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.';
74 $info['warning'][] = $synchoffsetwarning;
78 if (isset($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");
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)
93 // not sure what the actual last frame length will be, but will be less than or equal to 1441
94 $PossiblyLongerLAMEversion_FrameLength = 1441;
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)) {
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);
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'] = $PossiblyLongerLAMEversion_NewString;
117 if (!empty($info['audio']['encoder'])) {
118 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
121 switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
124 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
127 if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
128 switch ($info['audio']['dataformat']) {
132 $info['fileformat'] = $info['audio']['dataformat'];
136 $info['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"';
141 if (empty($info['fileformat'])) {
142 unset($info['fileformat']);
143 unset($info['audio']['bitrate_mode']);
144 unset($info['avdataoffset']);
145 unset($info['avdataend']);
149 $info['mime_type'] = 'audio/mpeg';
150 $info['audio']['lossless'] = false;
152 // Calculate playtime
153 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
154 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];
157 $info['audio']['encoder_options'] = $this->GuessEncoderOptions();
163 public function GuessEncoderOptions() {
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'];
173 $encoder_options = '';
174 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
176 if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
178 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
180 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) {
182 $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
184 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
186 static $KnownEncoderValues = array();
187 if (empty($KnownEncoderValues)) {
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
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 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
243 if (isset($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']])) {
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']];
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']])) {
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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
251 } elseif ($info['audio']['bitrate_mode'] == 'vbr') {
253 // http://gabriel.mp3-tech.org/mp3infotag.html
254 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
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'.$LAME_q_value;
261 } elseif ($info['audio']['bitrate_mode'] == 'cbr') {
263 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
267 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
271 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
273 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
275 } elseif (!empty($info['audio']['bitrate'])) {
277 if ($info['audio']['bitrate_mode'] == 'cbr') {
278 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
280 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
284 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
285 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
288 if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
289 $encoder_options .= ' --nogap';
292 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
293 $ExplodedOptions = explode(' ', $encoder_options, 4);
294 if ($ExplodedOptions[0] == '--r3mix') {
295 $ExplodedOptions[1] = 'r3mix';
297 switch ($ExplodedOptions[0]) {
301 if ($ExplodedOptions[1] == 'fast') {
302 $ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
304 switch ($ExplodedOptions[1]) {
310 case 'fast portable':
312 case 'fast standard':
316 static $ExpectedLowpass = array(
317 'insane|20500' => 20500,
318 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
319 'medium|18000' => 18000,
320 'fast medium|18000' => 18000,
321 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
322 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
323 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
324 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
325 'standard|19000' => 19000,
326 'fast standard|19000' => 19000,
327 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
328 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
329 'r3mix|18000' => 18000, // 3.94, 3.95
331 if (!isset($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'];
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']) {
351 // may or may not be same as source frequency - ignore
356 $ExplodedOptions = explode(' ', $encoder_options, 4);
357 switch ($ExplodedOptions[0]) {
360 switch ($ExplodedOptions[1]) {
367 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
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'];
391 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
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']);
403 return $encoder_options;
407 public function decodeMPEGaudioHeader($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 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
425 if (fseek($this->getid3->fp, $offset, SEEK_SET) != 0) {
426 $info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at '.$offset;
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
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
438 $head4 = substr($headerstring, 0, 4);
440 static $MPEGaudioHeaderDecodeCache = array();
441 if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
442 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
444 $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
445 $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
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($MPEGheaderRawArray, false, false);
455 if (!isset($info['mpeg']['audio'])) {
456 $info['mpeg']['audio'] = array();
458 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
461 if ($MPEGaudioHeaderValidCache[$head4]) {
462 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
464 $info['error'][] = 'Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset;
468 if (!$FastMPEGheaderScan) {
469 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
470 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
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']];
482 $info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
483 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
485 if ($thisfile_mpeg_audio['protection']) {
486 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
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;
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']];
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 $recursivesearch = false;
504 // For Layer 2 there are some combinations of bitrate and mode which are not allowed.
505 if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
507 $info['audio']['dataformat'] = 'mp2';
508 switch ($thisfile_mpeg_audio['channelmode']) {
511 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
514 $info['error'][] = $thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
522 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
525 $info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
535 if ($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']);
539 $nextframetestoffset = $offset + 1;
540 if ($thisfile_mpeg_audio['bitrate'] != 'free') {
542 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
544 if (isset($thisfile_mpeg_audio['framelength'])) {
545 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
547 $info['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.';
553 $ExpectedNumberOfAudioBytes = 0;
555 ////////////////////////////////////////////////////////////////////////////////////
556 // Variable-bitrate headers
558 if (substr($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
562 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
563 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
564 $info['audio']['codec'] = 'Fraunhofer';
566 $SideInfoData = substr($headerstring, 4 + 2, 32);
568 $FraunhoferVBROffset = 36;
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
580 $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
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;
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
597 $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
598 $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
600 if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
601 // 'Xing' is traditional Xing VBR frame
602 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
603 // 'Info' *can* legally be used to specify a VBR file as well, however.
605 // http://www.multiweb.cz/twoinches/MP3inside.htm
606 //00..03 = "Xing" or "Info"
608 // 0x01 Frames Flag set if value for number of frames in file is stored
609 // 0x02 Bytes Flag set if value for filesize in bytes is stored
610 // 0x04 TOC Flag set if values for TOC are stored
611 // 0x08 VBR Scale Flag set if values for VBR scale is stored
612 //08..11 Frames: Number of frames in file (including the first Xing/Info one)
613 //12..15 Bytes: File length in Bytes
614 //16..115 TOC (Table of Contents):
615 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
616 // Each Byte has a value according this formula:
617 // (TOC[i] / 256) * fileLenInBytes
618 // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
619 // TOC[(60/240)*100] = TOC[25]
620 // and corresponding Byte in file is then approximately at:
621 // (TOC[25]/256) * 5000000
625 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
626 // if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
627 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
628 $thisfile_mpeg_audio['VBR_method'] = 'Xing';
630 // $ScanAsCBR = true;
631 // $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
634 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
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);
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
645 if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
646 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
649 //if (($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'])) {
652 $framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];
654 if ($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 / $info['audio']['channels']) / 12;
659 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
660 //$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;
663 $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
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});
672 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
673 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
677 // http://gabriel.mp3-tech.org/mp3infotag.html
678 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
681 $thisfile_mpeg_audio['LAME'] = array();
682 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
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);
688 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
690 // extra 11 chars are not part of version string when LAMEtag present
691 unset($thisfile_mpeg_audio_lame['long_version']);
693 // It the LAME tag was only introduced in LAME v3.90
694 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
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;
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'];
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));
715 // bytes $9C-$A4 Encoder short VersionString
716 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
718 // byte $A5 Info Tag revision + VBR method
719 $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
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'
726 // byte $A6 Lowpass filter value
727 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
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);
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, $LAMEtagOffsetContant + 0xA7, 4));
741 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
742 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
744 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
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, $LAMEtagOffsetContant + 0xAD, 2));
751 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
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'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
761 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
762 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
764 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
765 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
767 unset($thisfile_mpeg_audio_lame_RGAD['track']);
769 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
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'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
779 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
780 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
782 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
783 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
785 unset($thisfile_mpeg_audio_lame_RGAD['album']);
787 if (empty($thisfile_mpeg_audio_lame_RGAD)) {
788 unset($thisfile_mpeg_audio_lame['RGAD']);
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;
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)
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'];
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;
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']);
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));
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';
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';
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']);
850 // bytes $BC-$BD MusicCRC
851 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
853 // bytes $BE-$BF CRC-16 of Info Tag
854 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
858 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
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'];
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 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
882 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
883 $info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
891 if (($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)';
898 $info['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)';
901 if ((($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';
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)';
913 $info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
918 if (($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;
927 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
928 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
931 $info['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
936 if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
937 switch ($thisfile_mpeg_audio['bitrate_mode']) {
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;
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'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
955 // End variable-bitrate headers
956 ////////////////////////////////////////////////////////////////////////////////////
958 if ($recursivesearch) {
960 if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
968 // // experimental side info parsing section - not returning anything useful yet
970 // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
971 // $SideInfoOffset = 0;
973 // if ($thisfile_mpeg_audio['version'] == '1') {
974 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
976 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
977 // $SideInfoOffset += 9;
978 // $SideInfoOffset += 5;
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 // $SideInfoOffset += 3;
985 // } else { // 2 or 2.5
986 // if ($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;
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 // $SideInfoOffset += 2;
999 // if ($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 // $SideInfoOffset += 2;
1007 // for ($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;
1019 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1020 // $SideInfoOffset += 9;
1022 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1023 // $SideInfoOffset += 1;
1025 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
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 // $SideInfoOffset += 1;
1032 // for ($region = 0; $region < 2; $region++) {
1033 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1034 // $SideInfoOffset += 5;
1036 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
1038 // for ($window = 0; $window < 3; $window++) {
1039 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1040 // $SideInfoOffset += 3;
1045 // for ($region = 0; $region < 3; $region++) {
1046 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1047 // $SideInfoOffset += 5;
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][$channel] = 0;
1057 // if ($thisfile_mpeg_audio['version'] == '1') {
1058 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1059 // $SideInfoOffset += 1;
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 // $SideInfoOffset += 1;
1072 public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) {
1073 $info = &$this->getid3->info;
1074 $firstframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1075 $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
1077 for ($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']) {
1084 $nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1085 if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
1087 // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
1088 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
1094 // next frame is OK, get ready to check the one after that
1095 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1096 $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
1098 $info['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
1102 } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
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
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 ('.$nextframetestoffset.') is not.';
1118 public function FreeFormatFrameLength($offset, $deepscan=false) {
1119 $info = &$this->getid3->info;
1121 fseek($this->getid3->fp, $offset, SEEK_SET);
1122 $MPEGaudioData = fread($this->getid3->fp, 32768);
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};
1131 $framelength = false;
1132 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1133 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1134 if ($framelength1 > 4) {
1135 $framelength = $framelength1;
1137 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1138 $framelength = $framelength2;
1140 if (!$framelength) {
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($SyncPattern2, 0, 3), 4);
1146 if ($framelength1 > 4) {
1147 $framelength = $framelength1;
1149 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1150 $framelength = $framelength2;
1152 if (!$framelength) {
1153 $info['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
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);
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);
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);
1183 $info['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
1186 $nextoffset += $framelength;
1188 if (count($ActualFrameLengthValues) > 0) {
1189 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1192 return $framelength;
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();
1217 $info = &$this->getid3->info;
1218 fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
1220 $max_frames_scan = 5000;
1221 $frames_scanned = 0;
1223 $previousvalidframe = $info['avdataoffset'];
1224 while (ftell($this->getid3->fp) < $info['avdataend']) {
1226 $head4 = fread($this->getid3->fp, 4);
1227 if (strlen($head4) < 4) {
1230 if ($head4{0} != "\xFF") {
1231 for ($i = 1; $i < 4; $i++) {
1232 if ($head4{$i} == "\xFF") {
1233 fseek($this->getid3->fp, $i - 4, SEEK_CUR);
1239 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1240 $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
1242 if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1243 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
1245 if ($MPEGaudioHeaderValidCache[$head4]) {
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]);
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($next4);
1268 if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1269 $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
1271 if ($MPEGaudioHeaderValidCache[$next4]) {
1272 fseek($this->getid3->fp, -4, SEEK_CUR);
1274 getid3_lib::safe_inc($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 / $pct_data_scanned);
1293 fseek($this->getid3->fp, $WhereWeWere - 3, SEEK_SET);
1298 foreach ($Distribution as $key => $value) {
1299 ksort($Distribution[$key], SORT_NUMERIC);
1301 ksort($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 $info['error'][] = 'Corrupt file - more than one MPEG version detected';
1310 if (count($Distribution['layer']) > 1) {
1311 $info['error'][] = 'Corrupt file - more than one MPEG layer detected';
1313 if (count($Distribution['frequency']) > 1) {
1314 $info['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
1319 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1320 if ($bitratevalue != 'free') {
1321 $bittotal += ($bitratevalue * $bitratecount);
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';
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);
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'] = $info['audio']['dataformat'];
1343 public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) {
1344 // looks for synch, decodes MPEG audio header
1346 $info = &$this->getid3->info;
1348 static $MPEGaudioVersionLookup;
1349 static $MPEGaudioLayerLookup;
1350 static $MPEGaudioBitrateLookup;
1351 if (empty($MPEGaudioVersionLookup)) {
1352 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1353 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1354 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1358 fseek($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;
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)) {
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']);
1376 if (isset($info['mpeg']['audio'])) {
1377 unset($info['mpeg']['audio']);
1379 if (empty($info['mpeg'])) {
1380 unset($info['mpeg']);
1384 } elseif (feof($this->getid3->fp)) {
1386 $info['error'][] = 'Could not find valid MPEG audio synch before end of file';
1387 if (isset($info['audio']['bitrate'])) {
1388 unset($info['audio']['bitrate']);
1390 if (isset($info['mpeg']['audio'])) {
1391 unset($info['mpeg']['audio']);
1393 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) {
1394 unset($info['mpeg']);
1400 if (($SynchSeekOffset + 1) >= strlen($header)) {
1401 $info['error'][] = 'Could not find valid MPEG synch before end of file';
1405 if (($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);
1416 $dummy = $info; // only overwrite real data if valid header found
1417 if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
1419 $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1420 switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
1425 $info['fileformat'] = 'mp3';
1426 $info['audio']['dataformat'] = 'mp3';
1429 if (isset($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 $info['audio']['dataformat'] = 'mp3';
1438 unset($dummy['mpeg']['audio']);
1439 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1440 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
1441 if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) {
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;
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 '.$GarbageOffsetEnd.')';
1450 if (isset($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 $BitrateHistogram = true;
1455 if ($BitrateHistogram) {
1457 $info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1458 $info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
1460 if ($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 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1468 } elseif ($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);
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);
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);
1478 // you can play with these numbers:
1479 $max_frames_scan = 50000;
1480 $max_scan_segments = 10;
1482 // don't play with these numbers:
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']) {
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;
1510 $synchstartoffset = $scan_start_offset[$current_segment];
1511 while ($this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) {
1513 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1515 if (empty($dummy['mpeg']['audio']['framelength'])) {
1516 $SynchErrorsFound++;
1517 $synchstartoffset++;
1519 getid3_lib::safe_inc($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 += $dummy['mpeg']['audio']['framelength'];
1525 if ($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;
1532 $pct_data_scanned += $this_pct_scanned;
1538 if ($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', $key1)) {
1544 foreach ($value1 as $key2 => $value2) {
1545 $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
1550 if ($SynchErrorsFound > 0) {
1551 $info['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
1557 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1558 $framecounter += $bitratecount;
1559 if ($bitratevalue != 'free') {
1560 $bittotal += ($bitratevalue * $bitratecount);
1563 if ($framecounter == 0) {
1564 $info['error'][] = 'Corrupt MP3 file: framecounter == zero';
1567 $info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
1568 $info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
1570 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
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 $distinct_bitrates++;
1580 if ($distinct_bitrates > 1) {
1581 $info['mpeg']['audio']['bitrate_mode'] = 'vbr';
1583 $info['mpeg']['audio']['bitrate_mode'] = 'cbr';
1585 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1589 break; // exit while()
1594 if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
1597 if (empty($info['mpeg']['audio'])) {
1599 $info['error'][] = 'could not find valid MPEG synch before end of file';
1600 if (isset($info['audio']['bitrate'])) {
1601 unset($info['audio']['bitrate']);
1603 if (isset($info['mpeg']['audio'])) {
1604 unset($info['mpeg']['audio']);
1606 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
1607 unset($info['mpeg']);
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'];
1623 public static function MPEGaudioVersionArray() {
1624 static $MPEGaudioVersion = array('2.5', false, '2', '1');
1625 return $MPEGaudioVersion;
1628 public static function MPEGaudioLayerArray() {
1629 static $MPEGaudioLayer = array(false, 3, 2, 1);
1630 return $MPEGaudioLayer;
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)
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),
1646 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1647 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
1649 return $MPEGaudioBitrate;
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)
1661 return $MPEGaudioFrequency;
1664 public static function MPEGaudioChannelModeArray() {
1665 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1666 return $MPEGaudioChannelMode;
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')
1678 return $MPEGaudioModeExtension;
1681 public static function MPEGaudioEmphasisArray() {
1682 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1683 return $MPEGaudioEmphasis;
1686 public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
1687 return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
1690 public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
1691 if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
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 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1712 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1713 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1715 echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
1718 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1719 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1721 echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
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) {
1736 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
1737 echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
1740 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
1741 echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
1744 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
1745 echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
1748 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
1749 echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
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 // $rawarray['original'];
1762 public static function MPEGaudioHeaderDecode($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
1773 // J - Mode extension (Only if Joint stereo)
1778 if (strlen($Header4Bytes) != 4) {
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
1796 return $MPEGrawHeader;
1799 public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) {
1800 static $AudioFrameLengthCache = array();
1802 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
1803 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
1804 if ($bitrate != 'free') {
1806 if ($version == '1') {
1808 if ($layer == '1') {
1810 // For Layer I slot is 32 bits long
1811 $FrameLengthCoefficient = 48;
1814 } else { // Layer 2 / 3
1816 // for Layer 2 and Layer 3 slot is 8 bits long.
1817 $FrameLengthCoefficient = 144;
1822 } else { // MPEG-2 / MPEG-2.5
1824 if ($layer == '1') {
1826 // For Layer I slot is 32 bits long
1827 $FrameLengthCoefficient = 24;
1830 } elseif ($layer == '2') {
1832 // for Layer 2 and Layer 3 slot is 8 bits long.
1833 $FrameLengthCoefficient = 144;
1838 // for Layer 2 and Layer 3 slot is 8 bits long.
1839 $FrameLengthCoefficient = 72;
1846 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
1847 if ($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)
1851 $NewFramelength += $SlotLength;
1853 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
1857 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
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));
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)) {
1873 $bit_rate_table[$round_bit_rate] = $standard_bit_rate;
1877 return $bit_rate_table[$round_bit_rate];
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
1890 '2' => array ('mono' => 0x0D, // 4 + 9 = 13
1891 'stereo' => 0x15, // 4 + 17 = 21
1892 'joint stereo' => 0x15,
1893 'dual channel' => 0x15
1896 '2.5' => array ('mono' => 0x15,
1898 'joint stereo' => 0x15,
1899 'dual channel' => 0x15
1903 return $XingVBRidOffset[$version][$channelmode];
1906 public static function LAMEvbrMethodLookup($VBRmethodID) {
1907 static $LAMEvbrMethodLookup = array(
1911 0x03 => 'vbr-old / vbr-rh',
1912 0x04 => 'vbr-new / vbr-mtrh',
1914 0x06 => 'vbr (full vbr method 4)',
1915 0x08 => 'cbr (constant bitrate 2 pass)',
1916 0x09 => 'abr (2 pass)',
1919 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
1922 public static function LAMEmiscStereoModeLookup($StereoModeID) {
1923 static $LAMEmiscStereoModeLookup = array(
1927 3 => 'joint stereo',
1928 4 => 'forced stereo',
1930 6 => 'intensity stereo',
1933 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
1936 public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
1937 static $LAMEmiscSourceSampleFrequencyLookup = array(
1943 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
1946 public static function LAMEsurroundInfoLookup($SurroundInfoID) {
1947 static $LAMEsurroundInfoLookup = array(
1948 0 => 'no surround info',
1949 1 => 'DPL encoding',
1950 2 => 'DPL2 encoding',
1951 3 => 'Ambisonic encoding'
1953 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
1956 public static function LAMEpresetUsedLookup($LAMEtag) {
1958 if ($LAMEtag['preset_used_id'] == 0) {
1959 // no preset used (LAME >=3.93)
1960 // no preset recorded (LAME <3.93)
1963 $LAMEpresetUsedLookup = array();
1965 ///// THIS PART CANNOT BE STATIC .
1966 for ($i = 8; $i <= 320; $i++) {
1967 switch ($LAMEtag['vbr_method']) {
1969 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
1972 default: // other VBR modes shouldn't be here(?)
1973 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
1978 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
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';
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
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
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');