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