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view e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.mp3.php @ 20:1038db2374ec judyates
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| author | Robert McIntyre <rlm@mit.edu> |
|---|---|
| date | Sun, 08 Sep 2013 00:47:09 -0400 |
| parents | 3f6b44aa6b35 |
| children |
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1 <?php2 // +----------------------------------------------------------------------+3 // | PHP version 5 |4 // +----------------------------------------------------------------------+5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |6 // +----------------------------------------------------------------------+7 // | This source file is subject to version 2 of the GPL license, |8 // | that is bundled with this package in the file license.txt and is |9 // | available through the world-wide-web at the following url: |10 // | http://www.gnu.org/copyleft/gpl.html |11 // +----------------------------------------------------------------------+12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |13 // +----------------------------------------------------------------------+14 // | Authors: James Heinrich <infoØgetid3*org> |15 // | Allan Hansen <ahØartemis*dk> |16 // +----------------------------------------------------------------------+17 // | module.audio.mp3.php |18 // | Module for analyzing MPEG Audio Layer 1,2,3 files. |19 // | dependencies: none |20 // +----------------------------------------------------------------------+21 //22 // $Id: module.audio.mp3.php,v 1.10 2006/11/16 22:57:57 ah Exp $26 class getid3_mp3 extends getid3_handler27 {28 // Number of frames to scan to determine if MPEG-audio sequence is valid.29 // Lower this number to 5-20 for faster scanning30 // Increase this number to 50+ for most accurate detection of valid VBR/CBR mpeg-audio streams31 const VALID_CHECK_FRAMES = 35;34 public function Analyze() {36 $this->getAllMPEGInfo($this->getid3->fp, $this->getid3->info);38 return true;39 }42 public function AnalyzeMPEGaudioInfo() {44 $this->getOnlyMPEGaudioInfo($this->getid3->fp, $this->getid3->info, $this->getid3->info['avdataoffset'], false);45 }48 public function getAllMPEGInfo(&$fd, &$info) {50 $this->getOnlyMPEGaudioInfo($fd, $info, 0 + $info['avdataoffset']);52 if (isset($info['mpeg']['audio']['bitrate_mode'])) {53 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);54 }56 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0)))) {58 $synch_offset_warning = 'Unknown data before synch ';59 if (isset($info['id3v2']['headerlength'])) {60 $synch_offset_warning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';61 } else {62 $synch_offset_warning .= '(should be at beginning of file, ';63 }64 $synch_offset_warning .= 'synch detected at '.$info['avdataoffset'].')';65 if ($info['audio']['bitrate_mode'] == 'cbr') {67 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {69 $synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';70 $info['audio']['codec'] = 'LAME';71 $current_data_lame_version_string = 'LAME3.';73 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {75 $synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';76 $info['audio']['codec'] = 'LAME';77 $current_data_lame_version_string = 'LAME3.';79 }81 }82 $this->getid3->warning($synch_offset_warning);84 }86 if (isset($info['mpeg']['audio']['LAME'])) {87 $info['audio']['codec'] = 'LAME';88 if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {89 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");90 } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {91 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");92 }93 }95 $current_data_lame_version_string = (!empty($current_data_lame_version_string) ? $current_data_lame_version_string : @$info['audio']['encoder']);96 if (!empty($current_data_lame_version_string) && (substr($current_data_lame_version_string, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($current_data_lame_version_string, -1))) {97 // a version number of LAME that does not end with a number like "LAME3.92"98 // or with a closing parenthesis like "LAME3.88 (alpha)"99 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)101 // not sure what the actual last frame length will be, but will be less than or equal to 1441102 $possibly_longer_lame_version_frame_length = 1441;104 // Not sure what version of LAME this is - look in padding of last frame for longer version string105 $possible_lame_version_string_offset = $info['avdataend'] - $possibly_longer_lame_version_frame_length;106 fseek($fd, $possible_lame_version_string_offset);107 $possibly_longer_lame_version_data = fread($fd, $possibly_longer_lame_version_frame_length);108 switch (substr($current_data_lame_version_string, -1)) {109 case 'a':110 case 'b':111 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example112 // need to trim off "a" to match longer string113 $current_data_lame_version_string = substr($current_data_lame_version_string, 0, -1);114 break;115 }116 if (($possibly_longer_lame_version_string = strstr($possibly_longer_lame_version_data, $current_data_lame_version_string)) !== false) {117 if (substr($possibly_longer_lame_version_string, 0, strlen($current_data_lame_version_string)) == $current_data_lame_version_string) {118 $possibly_longer_lame_version_new_string = substr($possibly_longer_lame_version_string, 0, strspn($possibly_longer_lame_version_string, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"119 if (strlen($possibly_longer_lame_version_new_string) > strlen(@$info['audio']['encoder'])) {120 $info['audio']['encoder'] = $possibly_longer_lame_version_new_string;121 }122 }123 }124 }125 if (!empty($info['audio']['encoder'])) {126 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");127 }129 switch (@$info['mpeg']['audio']['layer']) {130 case 1:131 case 2:132 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];133 break;134 }135 if (@$info['fileformat'] == 'mp3') {136 switch ($info['audio']['dataformat']) {137 case 'mp1':138 case 'mp2':139 case 'mp3':140 $info['fileformat'] = $info['audio']['dataformat'];141 break;143 default:144 $this->getid3->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"');145 break;146 }147 }149 $info['mime_type'] = 'audio/mpeg';150 $info['audio']['lossless'] = false;152 // Calculate playtime153 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {154 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];155 }157 $info['audio']['encoder_options'] = getid3_mp3::GuessEncoderOptions($info);159 return true;160 }164 public static function GuessEncoderOptions(&$info) {165 // shortcuts166 if (!empty($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 }173 $encoder_options = '';174 static $named_preset_bitrates = array (16, 24, 40, 56, 112, 128, 160, 192, 256);176 if ((@$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'], $named_preset_bitrates))) {182 $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];184 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {186 static $known_encoder_values = array ();187 if (empty($known_encoder_values)) {189 //$known_encoder_values[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';190 $known_encoder_values[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92191 $known_encoder_values[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91192 $known_encoder_values[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95193 $known_encoder_values['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92194 $known_encoder_values['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91195 $known_encoder_values['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3196 $known_encoder_values['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92197 $known_encoder_values['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91198 $known_encoder_values['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92199 $known_encoder_values['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3200 $known_encoder_values['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92201 $known_encoder_values['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3202 $known_encoder_values['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92203 $known_encoder_values['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91204 $known_encoder_values['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95205 $known_encoder_values['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3206 $known_encoder_values['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3208 $known_encoder_values[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92209 $known_encoder_values[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1210 $known_encoder_values[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93211 $known_encoder_values[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95212 $known_encoder_values[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92213 $known_encoder_values[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1214 $known_encoder_values[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93215 $known_encoder_values[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95216 $known_encoder_values[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92217 $known_encoder_values[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1218 $known_encoder_values[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95219 $known_encoder_values[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92220 $known_encoder_values[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92221 $known_encoder_values[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92222 $known_encoder_values[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1223 $known_encoder_values[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95224 $known_encoder_values[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1225 $known_encoder_values[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95226 $known_encoder_values[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14227 $known_encoder_values[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92228 $known_encoder_values[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91229 $known_encoder_values[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1230 $known_encoder_values[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95231 $known_encoder_values[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14232 $known_encoder_values[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15233 $known_encoder_values[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1234 $known_encoder_values[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93235 $known_encoder_values[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95236 $known_encoder_values[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14237 $known_encoder_values[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15238 $known_encoder_values[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1239 $known_encoder_values[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93240 $known_encoder_values[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95241 }243 if (isset($known_encoder_values[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$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 = $known_encoder_values[$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($known_encoder_values['**'][$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 = $known_encoder_values['**'][$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.html254 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h257 $lame_v_value = 10 - ceil($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);265 } else {267 $encoder_options = strtoupper($info['audio']['bitrate_mode']);269 }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);279 } else {280 $encoder_options = strtoupper($info['audio']['bitrate_mode']);281 }283 }284 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {285 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];286 }288 if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) {289 $encoder_options .= ' --nogap';290 }292 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {293 $exploded_options = explode(' ', $encoder_options, 4);294 if ($exploded_options[0] == '--r3mix') {295 $exploded_options[1] = 'r3mix';296 }297 switch ($exploded_options[0]) {298 case '--preset':299 case '--alt-preset':300 case '--r3mix':301 if ($exploded_options[1] == 'fast') {302 $exploded_options[1] .= ' '.$exploded_options[2];303 }304 switch ($exploded_options[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 $expected_lowpass = array (317 'insane|20500' => 20500,318 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91319 'medium|18000' => 18000,320 'fast medium|18000' => 18000,321 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95322 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1323 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95324 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1325 'standard|19000' => 19000,326 'fast standard|19000' => 19000,327 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92328 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91329 'r3mix|18000' => 18000, // 3.94, 3.95330 );331 if (!isset($expected_lowpass[$exploded_options[1].'|'.$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;336 default:337 break;338 }339 break;340 }341 }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: // <= 32000351 // may or may not be same as source frequency - ignore352 break;353 case 1: // 44100354 case 2: // 48000355 case 3: // 48000+356 $exploded_options = explode(' ', $encoder_options, 4);357 switch ($exploded_options[0]) {358 case '--preset':359 case '--alt-preset':360 switch ($exploded_options[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;370 default:371 static $expected_resampled_rate = array (372 'phon+/lw/mw-eu/sw|16000' => 16000,373 'mw-us|24000' => 24000, // 3.95374 'mw-us|32000' => 32000, // 3.93375 'mw-us|16000' => 16000, // 3.92376 'phone|16000' => 16000,377 'phone|11025' => 11025, // 3.94a15378 'radio|32000' => 32000, // 3.94a15379 'fm/radio|32000' => 32000, // 3.92380 'fm|32000' => 32000, // 3.90381 'voice|32000' => 32000);382 if (!isset($expected_resampled_rate[$exploded_options[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {383 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];384 }385 break;386 }387 break;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 }403 return $encoder_options;404 }408 public function decodeMPEGaudioHeader($fd, $offset, &$info, $recursive_search=true, $scan_as_cbr=false, $fast_mpeg_header_scan=false) {410 static $mpeg_audio_version_lookup;411 static $mpeg_audio_layer_lookup;412 static $mpeg_audio_bitrate_lookup;413 static $mpeg_audio_frequency_lookup;414 static $mpeg_audio_channel_mode_lookup;415 static $mpeg_audio_mode_extension_lookup;416 static $mpeg_audio_emphasis_lookup;417 if (empty($mpeg_audio_version_lookup)) {418 $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();419 $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();420 $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();421 $mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray();422 $mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray();423 $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray();424 $mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray();425 }427 if ($offset >= $info['avdataend']) {429 // non-fatal error: 'end of file encounter looking for MPEG synch'430 return;432 }433 fseek($fd, $offset, SEEK_SET);434 $header_string = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data436 // MP3 audio frame structure:437 // $aa $aa $aa $aa [$bb $bb] $cc...438 // where $aa..$aa is the four-byte mpeg-audio header (below)439 // $bb $bb is the optional 2-byte CRC440 // and $cc... is the audio data442 $head4 = substr($header_string, 0, 4);444 if (isset($mpeg_audio_header_decode_cache[$head4])) {445 $mpeg_header_raw_array= $mpeg_audio_header_decode_cache[$head4];446 } else {447 $mpeg_header_raw_array = getid3_mp3::MPEGaudioHeaderDecode($head4);448 $mpeg_audio_header_decode_cache[$head4] = $mpeg_header_raw_array;449 }451 // Not in cache452 if (!isset($mpeg_audio_header_valid_cache[$head4])) {453 $mpeg_audio_header_valid_cache[$head4] = getid3_mp3::MPEGaudioHeaderValid($mpeg_header_raw_array, false, false);454 }456 // shortcut457 if (!isset($info['mpeg']['audio'])) {458 $info['mpeg']['audio'] = array ();459 }460 $thisfile_mpeg_audio = &$info['mpeg']['audio'];463 if ($mpeg_audio_header_valid_cache[$head4]) {464 $thisfile_mpeg_audio['raw'] = $mpeg_header_raw_array;465 } else {467 // non-fatal error: Invalid MPEG audio header at offset $offset468 return;469 }471 if (!$fast_mpeg_header_scan) {473 $thisfile_mpeg_audio['version'] = $mpeg_audio_version_lookup[$thisfile_mpeg_audio['raw']['version']];474 $thisfile_mpeg_audio['layer'] = $mpeg_audio_layer_lookup[$thisfile_mpeg_audio['raw']['layer']];476 $thisfile_mpeg_audio['channelmode'] = $mpeg_audio_channel_mode_lookup[$thisfile_mpeg_audio['raw']['channelmode']];477 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);478 $thisfile_mpeg_audio['sample_rate'] = $mpeg_audio_frequency_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];479 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];480 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];481 $thisfile_mpeg_audio['modeextension'] = $mpeg_audio_mode_extension_lookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];482 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];483 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];484 $thisfile_mpeg_audio['emphasis'] = $mpeg_audio_emphasis_lookup[$thisfile_mpeg_audio['raw']['emphasis']];486 $info['audio']['channels'] = $thisfile_mpeg_audio['channels'];487 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];489 if ($thisfile_mpeg_audio['protection']) {490 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($header_string, 4, 2));491 }493 }495 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {496 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0497 $this->getid3->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1');498 $thisfile_mpeg_audio['raw']['bitrate'] = 0;499 }500 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];501 $thisfile_mpeg_audio['bitrate'] = $mpeg_audio_bitrate_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];503 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {504 // only skip multiple frame check if free-format bitstream found at beginning of file505 // otherwise is quite possibly simply corrupted data506 $recursive_search = false;507 }509 // For Layer 2 there are some combinations of bitrate and mode which are not allowed.510 if (!$fast_mpeg_header_scan && ($thisfile_mpeg_audio['layer'] == '2')) {512 $info['audio']['dataformat'] = 'mp2';513 switch ($thisfile_mpeg_audio['channelmode']) {515 case 'mono':516 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {517 // these are ok518 } else {520 // non-fatal error: bitrate not allowed in Layer 2/mono521 return;522 }523 break;525 case 'stereo':526 case 'joint stereo':527 case 'dual channel':528 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {529 // these are ok530 } else {532 // non-fatal error: bitrate not allowed in Layer 2/stereo/joint stereo/dual channel533 return;534 }535 break;537 }539 }542 if ($info['audio']['sample_rate'] > 0) {543 $thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);544 }546 $next_frame_test_offset = $offset + 1;547 if ($thisfile_mpeg_audio['bitrate'] != 'free') {549 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];551 if (isset($thisfile_mpeg_audio['framelength'])) {552 $next_frame_test_offset = $offset + $thisfile_mpeg_audio['framelength'];553 } else {555 // non-fatal error: Frame at offset('.$offset.') is has an invalid frame length.556 return;557 }559 }561 $expected_number_of_audio_bytes = 0;563 ////////////////////////////////////////////////////////////////////////////////////564 // Variable-bitrate headers566 if (substr($header_string, 4 + 32, 4) == 'VBRI') {567 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)568 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html570 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';571 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';572 $info['audio']['codec'] = 'Fraunhofer';574 $side_info_data = substr($header_string, 4 + 2, 32);576 $fraunhofer_vbr_offset = 36;578 $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 4, 2)); // VbriVersion579 $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 6, 2)); // VbriDelay580 $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 8, 2)); // VbriQuality581 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 10, 4)); // VbriStreamBytes582 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 14, 4)); // VbriStreamFrames583 $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 18, 2)); // VbriTableSize584 $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 20, 2)); // VbriTableScale585 $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 22, 2)); // VbriEntryBytes586 $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 24, 2)); // VbriEntryFrames588 $expected_number_of_audio_bytes = $thisfile_mpeg_audio['VBR_bytes'];590 $previous_byte_offset = $offset;591 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {592 $fraunhofer_offset_n = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset, $thisfile_mpeg_audio['VBR_entry_bytes']));593 $fraunhofer_vbr_offset += $thisfile_mpeg_audio['VBR_entry_bytes'];594 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']);595 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']) + $previous_byte_offset;596 $previous_byte_offset += $fraunhofer_offset_n;597 }600 } else {602 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)603 // depending on MPEG layer and number of channels605 $vbr_id_offset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);606 $side_info_data = substr($header_string, 4 + 2, $vbr_id_offset - 4);608 if ((substr($header_string, $vbr_id_offset, strlen('Xing')) == 'Xing') || (substr($header_string, $vbr_id_offset, strlen('Info')) == 'Info')) {609 // 'Xing' is traditional Xing VBR frame610 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)611 // 'Info' *can* legally be used to specify a VBR file as well, however.613 // http://www.multiweb.cz/twoinches/MP3inside.htm614 //00..03 = "Xing" or "Info"615 //04..07 = Flags:616 // 0x01 Frames Flag set if value for number of frames in file is stored617 // 0x02 Bytes Flag set if value for filesize in bytes is stored618 // 0x04 TOC Flag set if values for TOC are stored619 // 0x08 VBR Scale Flag set if values for VBR scale is stored620 //08..11 Frames: Number of frames in file (including the first Xing/Info one)621 //12..15 Bytes: File length in Bytes622 //16..115 TOC (Table of Contents):623 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.624 // Each Byte has a value according this formula:625 // (TOC[i] / 256) * fileLenInBytes626 // 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:627 // TOC[(60/240)*100] = TOC[25]628 // and corresponding Byte in file is then approximately at:629 // (TOC[25]/256) * 5000000630 //116..119 VBR Scale633 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME634 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';635 $thisfile_mpeg_audio['VBR_method'] = 'Xing';637 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 4, 4));639 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);640 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);641 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);642 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);644 if ($thisfile_mpeg_audio['xing_flags']['frames']) {645 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 8, 4));646 }647 if ($thisfile_mpeg_audio['xing_flags']['bytes']) {648 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 12, 4));649 }651 if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {653 $frame_lengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];655 if ($thisfile_mpeg_audio['layer'] == '1') {656 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12657 $info['audio']['bitrate'] = ($frame_lengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;658 } else {659 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144660 $info['audio']['bitrate'] = $frame_lengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;661 }662 $thisfile_mpeg_audio['framelength'] = floor($frame_lengthfloat);663 }665 if ($thisfile_mpeg_audio['xing_flags']['toc']) {666 $lame_toc_data = substr($header_string, $vbr_id_offset + 16, 100);667 for ($i = 0; $i < 100; $i++) {668 $thisfile_mpeg_audio['toc'][$i] = ord($lame_toc_data{$i});669 }670 }671 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {672 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 116, 4));673 }676 // http://gabriel.mp3-tech.org/mp3infotag.html677 if (substr($header_string, $vbr_id_offset + 120, 4) == 'LAME') {679 // shortcut680 $thisfile_mpeg_audio['LAME'] = array ();681 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];684 $thisfile_mpeg_audio_lame['long_version'] = substr($header_string, $vbr_id_offset + 120, 20);685 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);687 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {689 // extra 11 chars are not part of version string when LAMEtag present690 unset($thisfile_mpeg_audio_lame['long_version']);692 // It the LAME tag was only introduced in LAME v3.90693 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933695 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html696 // are assuming a 'Xing' identifier offset of 0x24, which is the case for697 // MPEG-1 non-mono, but not for other combinations698 $lame_tag_offset_contant = $vbr_id_offset - 0x24;700 // shortcuts701 $thisfile_mpeg_audio_lame['RGAD'] = array ('track'=>array(), 'album'=>array());702 $thisfile_mpeg_audio_lame_rgad = &$thisfile_mpeg_audio_lame['RGAD'];703 $thisfile_mpeg_audio_lame_rgad_track = &$thisfile_mpeg_audio_lame_rgad['track'];704 $thisfile_mpeg_audio_lame_rgad_album = &$thisfile_mpeg_audio_lame_rgad['album'];705 $thisfile_mpeg_audio_lame['raw'] = array ();706 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];708 // byte $9B VBR Quality709 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.710 // Actually overwrites original Xing bytes711 unset($thisfile_mpeg_audio['VBR_scale']);712 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0x9B, 1));714 // bytes $9C-$A4 Encoder short VersionString715 $thisfile_mpeg_audio_lame['short_version'] = substr($header_string, $lame_tag_offset_contant + 0x9C, 9);717 // byte $A5 Info Tag revision + VBR method718 $lame_tagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA5, 1));720 $thisfile_mpeg_audio_lame['tag_revision'] = ($lame_tagRevisionVBRmethod & 0xF0) >> 4;721 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $lame_tagRevisionVBRmethod & 0x0F;722 $thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);723 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'725 // byte $A6 Lowpass filter value726 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA6, 1)) * 100;728 // bytes $A7-$AE Replay Gain729 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html730 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"731 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {732 // LAME 3.94a16 and later - 9.23 fixed point733 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375734 $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA7, 4))) / 8388608);735 } else {736 // LAME 3.94a15 and earlier - 32-bit floating point737 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15738 $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($header_string, $lame_tag_offset_contant + 0xA7, 4));739 }740 if ($thisfile_mpeg_audio_lame_rgad['peak_amplitude'] == 0) {741 unset($thisfile_mpeg_audio_lame_rgad['peak_amplitude']);742 } else {743 $thisfile_mpeg_audio_lame_rgad['peak_db'] = 20 * log10($thisfile_mpeg_audio_lame_rgad['peak_amplitude']);744 }746 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAB, 2));747 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAD, 2));750 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {752 $thisfile_mpeg_audio_lame_rgad_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;753 $thisfile_mpeg_audio_lame_rgad_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;754 $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;755 $thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;756 $thisfile_mpeg_audio_lame_rgad_track['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['name']);757 $thisfile_mpeg_audio_lame_rgad_track['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['originator']);758 $thisfile_mpeg_audio_lame_rgad_track['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit']);760 if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) {761 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude'];762 }763 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_rgad_track['originator'];764 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_track['gain_db'];765 } else {766 unset($thisfile_mpeg_audio_lame_rgad['track']);767 }768 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {770 $thisfile_mpeg_audio_lame_rgad_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;771 $thisfile_mpeg_audio_lame_rgad_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;772 $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;773 $thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;774 $thisfile_mpeg_audio_lame_rgad_album['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['name']);775 $thisfile_mpeg_audio_lame_rgad_album['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['originator']);776 $thisfile_mpeg_audio_lame_rgad_album['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit']);778 if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) {779 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude'];780 }781 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_rgad_album['originator'];782 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_album['gain_db'];783 } else {784 unset($thisfile_mpeg_audio_lame_rgad['album']);785 }786 if (empty($thisfile_mpeg_audio_lame_rgad)) {787 unset($thisfile_mpeg_audio_lame['RGAD']);788 }791 // byte $AF Encoding flags + ATH Type792 $encoding_flags_ath_type = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAF, 1));793 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($encoding_flags_ath_type & 0x10);794 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($encoding_flags_ath_type & 0x20);795 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($encoding_flags_ath_type & 0x40);796 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($encoding_flags_ath_type & 0x80);797 $thisfile_mpeg_audio_lame['ath_type'] = $encoding_flags_ath_type & 0x0F;799 // byte $B0 if ABR {specified bitrate} else {minimal bitrate}800 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB0, 1));801 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)802 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];803 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)804 // ignore805 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate806 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];807 }809 // bytes $B1-$B3 Encoder delays810 $encoder_delays = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB1, 3));811 $thisfile_mpeg_audio_lame['encoder_delay'] = ($encoder_delays & 0xFFF000) >> 12;812 $thisfile_mpeg_audio_lame['end_padding'] = $encoder_delays & 0x000FFF;814 // byte $B4 Misc815 $misc_byte = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB4, 1));816 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($misc_byte & 0x03);817 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($misc_byte & 0x1C) >> 2;818 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($misc_byte & 0x20) >> 5;819 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($misc_byte & 0xC0) >> 6;820 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];821 $thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);822 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];823 $thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);825 // byte $B5 MP3 Gain826 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB5, 1), false, true);827 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (20 * log10(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];828 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));830 // bytes $B6-$B7 Preset and surround info831 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB6, 2));832 // Reserved = ($PresetSurroundBytes & 0xC000);833 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);834 $thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);835 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);836 $thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);837 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {838 $this->getid3->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');839 }840 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {841 // this may change if 3.90.4 ever comes out842 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';843 }845 // bytes $B8-$BB MusicLength846 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB8, 4));847 $expected_number_of_audio_bytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);849 // bytes $BC-$BD MusicCRC850 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBC, 2));852 // bytes $BE-$BF CRC-16 of Info Tag853 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBE, 2));856 // LAME CBR857 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {859 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';860 $thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);861 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];863 }865 }866 }868 } else {870 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)871 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';872 if ($recursive_search) {873 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';874 if (getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, true)) {875 $recursive_search = false;876 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';877 }878 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {879 $this->getid3->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');880 }881 }883 }885 }887 if (($expected_number_of_audio_bytes > 0) && ($expected_number_of_audio_bytes != ($info['avdataend'] - $info['avdataoffset']))) {888 if ($expected_number_of_audio_bytes > ($info['avdataend'] - $info['avdataoffset'])) {889 if (($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {890 $this->getid3->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');891 } else {892 $this->getid3->warning('Probable truncated file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');893 }894 } else {895 if ((($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes) == 1) {896 $info['avdataend']--;897 } else {898 $this->getid3->warning('Too much data in file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes).' bytes too many)');899 }900 }901 }903 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {904 if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {905 $frame_byte_length = getid3_mp3::FreeFormatFrameLength($fd, $offset, $info, true);906 if ($frame_byte_length > 0) {907 $thisfile_mpeg_audio['framelength'] = $frame_byte_length;908 if ($thisfile_mpeg_audio['layer'] == '1') {909 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12910 $info['audio']['bitrate'] = ((($frame_byte_length / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;911 } else {912 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144913 $info['audio']['bitrate'] = (($frame_byte_length - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;914 }915 } else {917 // non-fatal error: Error calculating frame length of free-format MP3 without Xing/LAME header.918 return;919 }920 }921 }923 if (@$thisfile_mpeg_audio['VBR_frames']) {924 switch ($thisfile_mpeg_audio['bitrate_mode']) {925 case 'vbr':926 case 'abr':927 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {928 $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 384);929 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {930 $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 576);931 } else {932 $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 1152);933 }934 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {935 $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];936 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion937 }938 break;939 }940 }942 // End variable-bitrate headers943 ////////////////////////////////////////////////////////////////////////////////////945 if ($recursive_search) {947 if (!getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, $scan_as_cbr)) {948 return false;949 }951 }953 return true;954 }958 public function RecursiveFrameScanning(&$fd, &$info, &$offset, &$next_frame_test_offset, $scan_as_cbr) {959 for ($i = 0; $i < getid3_mp3::VALID_CHECK_FRAMES; $i++) {960 // check next getid3_mp3::VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch961 if (($next_frame_test_offset + 4) >= $info['avdataend']) {962 // end of file963 return true;964 }966 $next_frame_test_array = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);967 if ($this->decodeMPEGaudioHeader($fd, $next_frame_test_offset, $next_frame_test_array, false)) {968 if ($scan_as_cbr) {969 // force CBR mode, used for trying to pick out invalid audio streams with970 // valid(?) VBR headers, or VBR streams with no VBR header971 if (!isset($next_frame_test_array['mpeg']['audio']['bitrate']) || !isset($info['mpeg']['audio']['bitrate']) || ($next_frame_test_array['mpeg']['audio']['bitrate'] != $info['mpeg']['audio']['bitrate'])) {972 return false;973 }974 }977 // next frame is OK, get ready to check the one after that978 if (isset($next_frame_test_array['mpeg']['audio']['framelength']) && ($next_frame_test_array['mpeg']['audio']['framelength'] > 0)) {979 $next_frame_test_offset += $next_frame_test_array['mpeg']['audio']['framelength'];980 } else {982 // non-fatal error: Frame at offset $offset has an invalid frame length.983 return;984 }986 } else {988 // non-fatal error: Next frame is not valid.989 return;990 }991 }992 return true;993 }997 public function FreeFormatFrameLength($fd, $offset, &$info, $deep_scan=false) {998 fseek($fd, $offset, SEEK_SET);999 $mpeg_audio_data = fread($fd, 32768);1001 $sync_pattern1 = substr($mpeg_audio_data, 0, 4);1002 // may be different pattern due to padding1003 $sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) | 0x02).$sync_pattern1{3};1004 if ($sync_pattern2 === $sync_pattern1) {1005 $sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) & 0xFD).$sync_pattern1{3};1006 }1008 $frame_length = false;1009 $frame_length1 = strpos($mpeg_audio_data, $sync_pattern1, 4);1010 $frame_length2 = strpos($mpeg_audio_data, $sync_pattern2, 4);1011 if ($frame_length1 > 4) {1012 $frame_length = $frame_length1;1013 }1014 if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) {1015 $frame_length = $frame_length2;1016 }1017 if (!$frame_length) {1019 // LAME 3.88 has a different value for modeextension on the first frame vs the rest1020 $frame_length1 = strpos($mpeg_audio_data, substr($sync_pattern1, 0, 3), 4);1021 $frame_length2 = strpos($mpeg_audio_data, substr($sync_pattern2, 0, 3), 4);1023 if ($frame_length1 > 4) {1024 $frame_length = $frame_length1;1025 }1026 if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) {1027 $frame_length = $frame_length2;1028 }1029 if (!$frame_length) {1030 throw new getid3_exception('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($sync_pattern1).' or '.getid3_lib::PrintHexBytes($sync_pattern2).') after offset '.$offset);1031 } else {1032 $this->getid3->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)');1033 $info['audio']['codec'] = 'LAME';1034 $info['audio']['encoder'] = 'LAME3.88';1035 $sync_pattern1 = substr($sync_pattern1, 0, 3);1036 $sync_pattern2 = substr($sync_pattern2, 0, 3);1037 }1038 }1040 if ($deep_scan) {1042 $actual_frame_length_values = array ();1043 $next_offset = $offset + $frame_length;1044 while ($next_offset < ($info['avdataend'] - 6)) {1045 fseek($fd, $next_offset - 1, SEEK_SET);1046 $NextSyncPattern = fread($fd, 6);1047 if ((substr($NextSyncPattern, 1, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 1, strlen($sync_pattern2)) == $sync_pattern2)) {1048 // good - found where expected1049 $actual_frame_length_values[] = $frame_length;1050 } elseif ((substr($NextSyncPattern, 0, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 0, strlen($sync_pattern2)) == $sync_pattern2)) {1051 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)1052 $actual_frame_length_values[] = ($frame_length - 1);1053 $next_offset--;1054 } elseif ((substr($NextSyncPattern, 2, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 2, strlen($sync_pattern2)) == $sync_pattern2)) {1055 // ok - found one byte later than expected (last frame was padded, first frame wasn't)1056 $actual_frame_length_values[] = ($frame_length + 1);1057 $next_offset++;1058 } else {1059 throw new getid3_exception('Did not find expected free-format sync pattern at offset '.$next_offset);1060 }1061 $next_offset += $frame_length;1062 }1063 if (count($actual_frame_length_values) > 0) {1064 $frame_length = intval(round(array_sum($actual_frame_length_values) / count($actual_frame_length_values)));1065 }1066 }1067 return $frame_length;1068 }1072 public function getOnlyMPEGaudioInfo($fd, &$info, $avdata_offset, $bit_rate_histogram=false) {1074 // looks for synch, decodes MPEG audio header1076 fseek($fd, $avdata_offset, SEEK_SET);1078 $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdata_offset);1079 $header = fread($fd, $sync_seek_buffer_size);1080 $sync_seek_buffer_size = strlen($header);1081 $synch_seek_offset = 0;1083 static $mpeg_audio_version_lookup;1084 static $mpeg_audio_layer_lookup;1085 static $mpeg_audio_bitrate_lookup;1086 if (empty($mpeg_audio_version_lookup)) {1087 $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();1088 $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();1089 $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();1091 }1093 while ($synch_seek_offset < $sync_seek_buffer_size) {1095 if ((($avdata_offset + $synch_seek_offset) < $info['avdataend']) && !feof($fd)) {1097 // if a synch's not found within the first 128k bytes, then give up1098 if ($synch_seek_offset > $sync_seek_buffer_size) {1099 throw new getid3_exception('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB');1100 }1102 if (feof($fd)) {1103 throw new getid3_exception('Could not find valid MPEG audio synch before end of file');1104 }1105 }1107 if (($synch_seek_offset + 1) >= strlen($header)) {1108 throw new getid3_exception('Could not find valid MPEG synch before end of file');1109 }1111 if (($header{$synch_seek_offset} == "\xFF") && ($header{($synch_seek_offset + 1)} > "\xE0")) { // synch detected1113 if (!isset($first_frame_info) && !isset($info['mpeg']['audio'])) {1114 $first_frame_info = $info;1115 $first_frame_avdata_offset = $avdata_offset + $synch_seek_offset;1116 if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $first_frame_info, false)) {1117 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's1118 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below1119 unset($first_frame_info);1120 }1121 }1123 $dummy = $info; // only overwrite real data if valid header found1124 if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $dummy, true)) {1125 $info = $dummy;1126 $info['avdataoffset'] = $avdata_offset + $synch_seek_offset;1128 switch (@$info['fileformat']) {1129 case '':1130 case 'mp3':1131 $info['fileformat'] = 'mp3';1132 $info['audio']['dataformat'] = 'mp3';1133 break;1134 }1135 if (isset($first_frame_info['mpeg']['audio']['bitrate_mode']) && ($first_frame_info['mpeg']['audio']['bitrate_mode'] == 'vbr')) {1136 if (!(abs($info['audio']['bitrate'] - $first_frame_info['audio']['bitrate']) <= 1)) {1137 // If there is garbage data between a valid VBR header frame and a sequence1138 // of valid MPEG-audio frames the VBR data is no longer discarded.1139 $info = $first_frame_info;1140 $info['avdataoffset'] = $first_frame_avdata_offset;1141 $info['fileformat'] = 'mp3';1142 $info['audio']['dataformat'] = 'mp3';1143 $dummy = $info;1144 unset($dummy['mpeg']['audio']);1145 $GarbageOffsetStart = $first_frame_avdata_offset + $first_frame_info['mpeg']['audio']['framelength'];1146 $GarbageOffsetEnd = $avdata_offset + $synch_seek_offset;1147 if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {1149 $info = $dummy;1150 $info['avdataoffset'] = $GarbageOffsetEnd;1151 $this->getid3->warning('apparently-valid VBR header not used because could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd);1153 } else {1155 $this->getid3->warning('using data from VBR header even though could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')');1157 }1158 }1159 }1160 if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {1161 // VBR file with no VBR header1162 $bit_rate_histogram = true;1163 }1165 if ($bit_rate_histogram) {1167 $info['mpeg']['audio']['stereo_distribution'] = array ('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);1168 $info['mpeg']['audio']['version_distribution'] = array ('1'=>0, '2'=>0, '2.5'=>0);1170 if ($info['mpeg']['audio']['version'] == '1') {1171 if ($info['mpeg']['audio']['layer'] == 3) {1172 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);1173 } elseif ($info['mpeg']['audio']['layer'] == 2) {1174 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);1175 } elseif ($info['mpeg']['audio']['layer'] == 1) {1176 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);1177 }1178 } elseif ($info['mpeg']['audio']['layer'] == 1) {1179 $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);1180 } else {1181 $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);1182 }1184 $dummy = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);1185 $synch_start_offset = $info['avdataoffset'];1187 $fast_mode = false;1188 $synch_errors_found = 0;1189 while ($this->decodeMPEGaudioHeader($fd, $synch_start_offset, $dummy, false, false, $fast_mode)) {1190 $fast_mode = true;1191 $thisframebitrate = $mpeg_audio_bitrate_lookup[$mpeg_audio_version_lookup[$dummy['mpeg']['audio']['raw']['version']]][$mpeg_audio_layer_lookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];1193 if (empty($dummy['mpeg']['audio']['framelength'])) {1194 $synch_errors_found++;1195 }1196 else {1197 @$info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;1198 @$info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;1199 @$info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;1201 $synch_start_offset += $dummy['mpeg']['audio']['framelength'];1202 }1203 }1204 if ($synch_errors_found > 0) {1205 $this->getid3->warning('Found '.$synch_errors_found.' synch errors in histogram analysis');1206 }1208 $bit_total = 0;1209 $frame_counter = 0;1210 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {1211 $frame_counter += $bit_rate_count;1212 if ($bit_rate_value != 'free') {1213 $bit_total += ($bit_rate_value * $bit_rate_count);1214 }1215 }1216 if ($frame_counter == 0) {1217 throw new getid3_exception('Corrupt MP3 file: framecounter == zero');1218 }1219 $info['mpeg']['audio']['frame_count'] = $frame_counter;1220 $info['mpeg']['audio']['bitrate'] = ($bit_total / $frame_counter);1222 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];1225 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently1226 $distinct_bit_rates = 0;1227 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {1228 if ($bit_rate_count > 0) {1229 $distinct_bit_rates++;1230 }1231 }1232 if ($distinct_bit_rates > 1) {1233 $info['mpeg']['audio']['bitrate_mode'] = 'vbr';1234 } else {1235 $info['mpeg']['audio']['bitrate_mode'] = 'cbr';1236 }1237 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];1239 }1241 break; // exit while()1242 }1243 }1245 $synch_seek_offset++;1246 if (($avdata_offset + $synch_seek_offset) >= $info['avdataend']) {1247 // end of file/data1249 if (empty($info['mpeg']['audio'])) {1251 throw new getid3_exception('could not find valid MPEG synch before end of file');1252 }1253 break;1254 }1256 }1258 $info['audio']['channels'] = $info['mpeg']['audio']['channels'];1259 $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];1260 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];1261 return true;1262 }1266 public static function MPEGaudioVersionarray() {1268 static $array = array ('2.5', false, '2', '1');1269 return $array;1270 }1274 public static function MPEGaudioLayerarray() {1276 static $array = array (false, 3, 2, 1);1277 return $array;1278 }1282 public static function MPEGaudioBitratearray() {1284 static $array;1285 if (empty($array)) {1286 $array = array (1287 '1' => array (1 => array ('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),1288 2 => array ('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),1289 3 => array ('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)1290 ),1292 '2' => array (1 => array ('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),1293 2 => array ('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),1294 )1295 );1296 $array['2'][3] = $array['2'][2];1297 $array['2.5'] = $array['2'];1298 }1299 return $array;1300 }1304 public static function MPEGaudioFrequencyarray() {1306 static $array = array (1307 '1' => array (44100, 48000, 32000),1308 '2' => array (22050, 24000, 16000),1309 '2.5' => array (11025, 12000, 8000)1310 );1311 return $array;1312 }1316 public static function MPEGaudioChannelModearray() {1318 static $array = array ('stereo', 'joint stereo', 'dual channel', 'mono');1319 return $array;1320 }1324 public static function MPEGaudioModeExtensionarray() {1326 static $array = array (1327 1 => array ('4-31', '8-31', '12-31', '16-31'),1328 2 => array ('4-31', '8-31', '12-31', '16-31'),1329 3 => array ('', 'IS', 'MS', 'IS+MS')1330 );1331 return $array;1332 }1336 public static function MPEGaudioEmphasisarray() {1338 static $array = array ('none', '50/15ms', false, 'CCIT J.17');1339 return $array;1340 }1344 public static function MPEGaudioHeaderBytesValid($head4, $allow_bitrate_15=false) {1346 return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allow_bitrate_15);1347 }1351 public static function MPEGaudioHeaderValid($raw_array, $echo_errors=false, $allow_bitrate_15=false) {1353 if (($raw_array['synch'] & 0x0FFE) != 0x0FFE) {1354 return false;1355 }1357 static $mpeg_audio_version_lookup;1358 static $mpeg_audio_layer_lookup;1359 static $mpeg_audio_bitrate_lookup;1360 static $mpeg_audio_frequency_lookup;1361 static $mpeg_audio_channel_mode_lookup;1362 static $mpeg_audio_mode_extension_lookup;1363 static $mpeg_audio_emphasis_lookup;1364 if (empty($mpeg_audio_version_lookup)) {1365 $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();1366 $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();1367 $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();1368 $mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray();1369 $mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray();1370 $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray();1371 $mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray();1372 }1374 if (isset($mpeg_audio_version_lookup[$raw_array['version']])) {1375 $decodedVersion = $mpeg_audio_version_lookup[$raw_array['version']];1376 } else {1377 echo ($echo_errors ? "\n".'invalid Version ('.$raw_array['version'].')' : '');1378 return false;1379 }1380 if (isset($mpeg_audio_layer_lookup[$raw_array['layer']])) {1381 $decodedLayer = $mpeg_audio_layer_lookup[$raw_array['layer']];1382 } else {1383 echo ($echo_errors ? "\n".'invalid Layer ('.$raw_array['layer'].')' : '');1384 return false;1385 }1386 if (!isset($mpeg_audio_bitrate_lookup[$decodedVersion][$decodedLayer][$raw_array['bitrate']])) {1387 echo ($echo_errors ? "\n".'invalid Bitrate ('.$raw_array['bitrate'].')' : '');1388 if ($raw_array['bitrate'] == 15) {1389 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 01390 // let it go through here otherwise file will not be identified1391 if (!$allow_bitrate_15) {1392 return false;1393 }1394 } else {1395 return false;1396 }1397 }1398 if (!isset($mpeg_audio_frequency_lookup[$decodedVersion][$raw_array['sample_rate']])) {1399 echo ($echo_errors ? "\n".'invalid Frequency ('.$raw_array['sample_rate'].')' : '');1400 return false;1401 }1402 if (!isset($mpeg_audio_channel_mode_lookup[$raw_array['channelmode']])) {1403 echo ($echo_errors ? "\n".'invalid ChannelMode ('.$raw_array['channelmode'].')' : '');1404 return false;1405 }1406 if (!isset($mpeg_audio_mode_extension_lookup[$decodedLayer][$raw_array['modeextension']])) {1407 echo ($echo_errors ? "\n".'invalid Mode Extension ('.$raw_array['modeextension'].')' : '');1408 return false;1409 }1410 if (!isset($mpeg_audio_emphasis_lookup[$raw_array['emphasis']])) {1411 echo ($echo_errors ? "\n".'invalid Emphasis ('.$raw_array['emphasis'].')' : '');1412 return false;1413 }1414 // These are just either set or not set, you can't mess that up :)1415 // $raw_array['protection'];1416 // $raw_array['padding'];1417 // $raw_array['private'];1418 // $raw_array['copyright'];1419 // $raw_array['original'];1421 return true;1422 }1426 public static function MPEGaudioHeaderDecode($header_four_bytes) {1427 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM1428 // A - Frame sync (all bits set)1429 // B - MPEG Audio version ID1430 // C - Layer description1431 // D - Protection bit1432 // E - Bitrate index1433 // F - Sampling rate frequency index1434 // G - Padding bit1435 // H - Private bit1436 // I - Channel Mode1437 // J - Mode extension (Only if Joint stereo)1438 // K - Copyright1439 // L - Original1440 // M - Emphasis1442 if (strlen($header_four_bytes) != 4) {1443 return false;1444 }1446 $mpeg_raw_header['synch'] = (getid3_lib::BigEndian2Int(substr($header_four_bytes, 0, 2)) & 0xFFE0) >> 4;1447 $mpeg_raw_header['version'] = (ord($header_four_bytes{1}) & 0x18) >> 3; // BB1448 $mpeg_raw_header['layer'] = (ord($header_four_bytes{1}) & 0x06) >> 1; // CC1449 $mpeg_raw_header['protection'] = (ord($header_four_bytes{1}) & 0x01); // D1450 $mpeg_raw_header['bitrate'] = (ord($header_four_bytes{2}) & 0xF0) >> 4; // EEEE1451 $mpeg_raw_header['sample_rate'] = (ord($header_four_bytes{2}) & 0x0C) >> 2; // FF1452 $mpeg_raw_header['padding'] = (ord($header_four_bytes{2}) & 0x02) >> 1; // G1453 $mpeg_raw_header['private'] = (ord($header_four_bytes{2}) & 0x01); // H1454 $mpeg_raw_header['channelmode'] = (ord($header_four_bytes{3}) & 0xC0) >> 6; // II1455 $mpeg_raw_header['modeextension'] = (ord($header_four_bytes{3}) & 0x30) >> 4; // JJ1456 $mpeg_raw_header['copyright'] = (ord($header_four_bytes{3}) & 0x08) >> 3; // K1457 $mpeg_raw_header['original'] = (ord($header_four_bytes{3}) & 0x04) >> 2; // L1458 $mpeg_raw_header['emphasis'] = (ord($header_four_bytes{3}) & 0x03); // MM1460 return $mpeg_raw_header;1461 }1465 public static function MPEGaudioFrameLength(&$bit_rate, &$version, &$layer, $padding, &$sample_rate) {1467 if (!isset($cache[$bit_rate][$version][$layer][$padding][$sample_rate])) {1468 $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = false;1469 if ($bit_rate != 'free') {1471 if ($version == '1') {1473 if ($layer == '1') {1475 // For Layer I slot is 32 bits long1476 $frame_length_coefficient = 48;1477 $slot_length = 4;1479 } else { // Layer 2 / 31481 // for Layer 2 and Layer 3 slot is 8 bits long.1482 $frame_length_coefficient = 144;1483 $slot_length = 1;1485 }1487 } else { // MPEG-2 / MPEG-2.51489 if ($layer == '1') {1491 // For Layer I slot is 32 bits long1492 $frame_length_coefficient = 24;1493 $slot_length = 4;1495 } elseif ($layer == '2') {1497 // for Layer 2 and Layer 3 slot is 8 bits long.1498 $frame_length_coefficient = 144;1499 $slot_length = 1;1501 } else { // layer 31503 // for Layer 2 and Layer 3 slot is 8 bits long.1504 $frame_length_coefficient = 72;1505 $slot_length = 1;1507 }1509 }1511 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding1512 if ($sample_rate > 0) {1513 $new_frame_length = ($frame_length_coefficient * $bit_rate) / $sample_rate;1514 $new_frame_length = floor($new_frame_length / $slot_length) * $slot_length; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)1515 if ($padding) {1516 $new_frame_length += $slot_length;1517 }1518 $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = (int) $new_frame_length;1519 }1520 }1521 }1522 return $cache[$bit_rate][$version][$layer][$padding][$sample_rate];1523 }1527 public static function ClosestStandardMP3Bitrate($bit_rate) {1529 static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);1530 static $bit_rate_table = array (0=>'-');1531 $round_bit_rate = intval(round($bit_rate, -3));1532 if (!isset($bit_rate_table[$round_bit_rate])) {1533 if ($round_bit_rate > 320000) {1534 $bit_rate_table[$round_bit_rate] = round($bit_rate, -4);1535 } else {1536 $last_bit_rate = 320000;1537 foreach ($standard_bit_rates as $standard_bit_rate) {1538 $bit_rate_table[$round_bit_rate] = $standard_bit_rate;1539 if ($round_bit_rate >= $standard_bit_rate - (($last_bit_rate - $standard_bit_rate) / 2)) {1540 break;1541 }1542 $last_bit_rate = $standard_bit_rate;1543 }1544 }1545 }1546 return $bit_rate_table[$round_bit_rate];1547 }1551 public static function XingVBRidOffset($version, $channel_mode) {1553 static $lookup = array (1554 '1' => array ('mono' => 0x15, // 4 + 17 = 211555 'stereo' => 0x24, // 4 + 32 = 361556 'joint stereo' => 0x24,1557 'dual channel' => 0x241558 ),1560 '2' => array ('mono' => 0x0D, // 4 + 9 = 131561 'stereo' => 0x15, // 4 + 17 = 211562 'joint stereo' => 0x15,1563 'dual channel' => 0x151564 ),1566 '2.5' => array ('mono' => 0x15,1567 'stereo' => 0x15,1568 'joint stereo' => 0x15,1569 'dual channel' => 0x151570 )1571 );1573 return $lookup[$version][$channel_mode];1574 }1578 public static function LAMEvbrMethodLookup($vbr_method_id) {1580 static $lookup = array (1581 0x00 => 'unknown',1582 0x01 => 'cbr',1583 0x02 => 'abr',1584 0x03 => 'vbr-old / vbr-rh',1585 0x04 => 'vbr-new / vbr-mtrh',1586 0x05 => 'vbr-mt',1587 0x06 => 'Full VBR Method 4',1588 0x08 => 'constant bitrate 2 pass',1589 0x09 => 'abr 2 pass',1590 0x0F => 'reserved'1591 );1592 return (isset($lookup[$vbr_method_id]) ? $lookup[$vbr_method_id] : '');1593 }1597 public static function LAMEmiscStereoModeLookup($stereo_mode_id) {1599 static $lookup = array (1600 0 => 'mono',1601 1 => 'stereo',1602 2 => 'dual mono',1603 3 => 'joint stereo',1604 4 => 'forced stereo',1605 5 => 'auto',1606 6 => 'intensity stereo',1607 7 => 'other'1608 );1609 return (isset($lookup[$stereo_mode_id]) ? $lookup[$stereo_mode_id] : '');1610 }1614 public static function LAMEmiscSourceSampleFrequencyLookup($source_sample_frequency_id) {1616 static $lookup = array (1617 0 => '<= 32 kHz',1618 1 => '44.1 kHz',1619 2 => '48 kHz',1620 3 => '> 48kHz'1621 );1622 return (isset($lookup[$source_sample_frequency_id]) ? $lookup[$source_sample_frequency_id] : '');1623 }1627 public static function LAMEsurroundInfoLookup($surround_info_id) {1629 static $lookup = array (1630 0 => 'no surround info',1631 1 => 'DPL encoding',1632 2 => 'DPL2 encoding',1633 3 => 'Ambisonic encoding'1634 );1635 return (isset($lookup[$surround_info_id]) ? $lookup[$surround_info_id] : 'reserved');1636 }1640 public static function LAMEpresetUsedLookup($lame_tag) {1642 if ($lame_tag['preset_used_id'] == 0) {1643 // no preset used (LAME >=3.93)1644 // no preset recorded (LAME <3.93)1645 return '';1646 }1648 $lame_preset_used_lookup = array ();1650 for ($i = 8; $i <= 320; $i++) {1651 switch ($lame_tag['vbr_method']) {1652 case 'cbr':1653 $lame_preset_used_lookup[$i] = '--alt-preset '.$lame_tag['vbr_method'].' '.$i;1654 break;1655 case 'abr':1656 default: // other VBR modes shouldn't be here(?)1657 $lame_preset_used_lookup[$i] = '--alt-preset '.$i;1658 break;1659 }1660 }1662 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()1664 // named alt-presets1665 $lame_preset_used_lookup[1000] = '--r3mix';1666 $lame_preset_used_lookup[1001] = '--alt-preset standard';1667 $lame_preset_used_lookup[1002] = '--alt-preset extreme';1668 $lame_preset_used_lookup[1003] = '--alt-preset insane';1669 $lame_preset_used_lookup[1004] = '--alt-preset fast standard';1670 $lame_preset_used_lookup[1005] = '--alt-preset fast extreme';1671 $lame_preset_used_lookup[1006] = '--alt-preset medium';1672 $lame_preset_used_lookup[1007] = '--alt-preset fast medium';1674 // LAME 3.94 additions/changes1675 $lame_preset_used_lookup[1010] = '--preset portable'; // 3.94a15 Oct 21 20031676 $lame_preset_used_lookup[1015] = '--preset radio'; // 3.94a15 Oct 21 20031678 $lame_preset_used_lookup[320] = '--preset insane'; // 3.94a15 Nov 12 20031679 $lame_preset_used_lookup[410] = '-V9';1680 $lame_preset_used_lookup[420] = '-V8';1681 $lame_preset_used_lookup[430] = '--preset radio'; // 3.94a15 Nov 12 20031682 $lame_preset_used_lookup[440] = '-V6';1683 $lame_preset_used_lookup[450] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 20031684 $lame_preset_used_lookup[460] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 20031685 $lame_preset_used_lookup[470] = '--r3mix'; // 3.94b1 Dec 18 20031686 $lame_preset_used_lookup[480] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 20031687 $lame_preset_used_lookup[490] = '-V1';1688 $lame_preset_used_lookup[500] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 20031690 return (isset($lame_preset_used_lookup[$lame_tag['preset_used_id']]) ? $lame_preset_used_lookup[$lame_tag['preset_used_id']] : 'new/unknown preset: '.$lame_tag['preset_used_id'].' - report to info@getid3.org');1691 }1694 }1696 ?>