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Code source de LifeType 1.2.4 |
1 <?php 2 ///////////////////////////////////////////////////////////////// 3 /// getID3() by James Heinrich <info@getid3.org> // 4 // available at http://getid3.sourceforge.net // 5 // or http://www.getid3.org // 6 ///////////////////////////////////////////////////////////////// 7 // See readme.txt for more details // 8 ///////////////////////////////////////////////////////////////// 9 // // 10 // module.audio.mp3.php // 11 // module for analyzing MP3 files // 12 // dependencies: NONE // 13 // /// 14 ///////////////////////////////////////////////////////////////// 15 16 17 // number of frames to scan to determine if MPEG-audio sequence is valid 18 // Lower this number to 5-20 for faster scanning 19 // Increase this number to 50+ for most accurate detection of valid VBR/CBR 20 // mpeg-audio streams 21 define('GETID3_MP3_VALID_CHECK_FRAMES', 35); 22 23 24 class getid3_mp3 25 { 26 27 var $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files 28 29 function getid3_mp3(&$fd, &$ThisFileInfo) { 30 31 if (!$this->getOnlyMPEGaudioInfo($fd, $ThisFileInfo, $ThisFileInfo['avdataoffset'])) { 32 if ($this->allow_bruteforce) { 33 $ThisFileInfo['error'][] = 'Rescanning file in BruteForce mode'; 34 $this->getOnlyMPEGaudioInfoBruteForce($fd, $ThisFileInfo); 35 } 36 } 37 38 39 if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode'])) { 40 $ThisFileInfo['audio']['bitrate_mode'] = strtolower($ThisFileInfo['mpeg']['audio']['bitrate_mode']); 41 } 42 43 if (((isset($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] > $ThisFileInfo['id3v2']['headerlength'])) || (!isset($ThisFileInfo['id3v2']) && ($ThisFileInfo['avdataoffset'] > 0)))) { 44 45 $synchoffsetwarning = 'Unknown data before synch '; 46 if (isset($ThisFileInfo['id3v2']['headerlength'])) { 47 $synchoffsetwarning .= '(ID3v2 header ends at '.$ThisFileInfo['id3v2']['headerlength'].', then '.($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']).' bytes garbage, '; 48 } else { 49 $synchoffsetwarning .= '(should be at beginning of file, '; 50 } 51 $synchoffsetwarning .= 'synch detected at '.$ThisFileInfo['avdataoffset'].')'; 52 if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') { 53 54 if (!empty($ThisFileInfo['id3v2']['headerlength']) && (($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']) == $ThisFileInfo['mpeg']['audio']['framelength'])) { 55 56 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.'; 57 $ThisFileInfo['audio']['codec'] = 'LAME'; 58 $CurrentDataLAMEversionString = 'LAME3.'; 59 60 } elseif (empty($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] == $ThisFileInfo['mpeg']['audio']['framelength'])) { 61 62 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.'; 63 $ThisFileInfo['audio']['codec'] = 'LAME'; 64 $CurrentDataLAMEversionString = 'LAME3.'; 65 66 } 67 68 } 69 $ThisFileInfo['warning'][] = $synchoffsetwarning; 70 71 } 72 73 if (isset($ThisFileInfo['mpeg']['audio']['LAME'])) { 74 $ThisFileInfo['audio']['codec'] = 'LAME'; 75 if (!empty($ThisFileInfo['mpeg']['audio']['LAME']['long_version'])) { 76 $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['long_version'], "\x00"); 77 } elseif (!empty($ThisFileInfo['mpeg']['audio']['LAME']['short_version'])) { 78 $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['short_version'], "\x00"); 79 } 80 } 81 82 $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : @$ThisFileInfo['audio']['encoder']); 83 if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) { 84 // a version number of LAME that does not end with a number like "LAME3.92" 85 // or with a closing parenthesis like "LAME3.88 (alpha)" 86 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92) 87 88 // not sure what the actual last frame length will be, but will be less than or equal to 1441 89 $PossiblyLongerLAMEversion_FrameLength = 1441; 90 91 // Not sure what version of LAME this is - look in padding of last frame for longer version string 92 $PossibleLAMEversionStringOffset = $ThisFileInfo['avdataend'] - $PossiblyLongerLAMEversion_FrameLength; 93 fseek($fd, $PossibleLAMEversionStringOffset); 94 $PossiblyLongerLAMEversion_Data = fread($fd, $PossiblyLongerLAMEversion_FrameLength); 95 switch (substr($CurrentDataLAMEversionString, -1)) { 96 case 'a': 97 case 'b': 98 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example 99 // need to trim off "a" to match longer string 100 $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1); 101 break; 102 } 103 if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) { 104 if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) { 105 $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)" 106 if (strlen($PossiblyLongerLAMEversion_NewString) > strlen(@$ThisFileInfo['audio']['encoder'])) { 107 $ThisFileInfo['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString; 108 } 109 } 110 } 111 } 112 if (!empty($ThisFileInfo['audio']['encoder'])) { 113 $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['audio']['encoder'], "\x00 "); 114 } 115 116 switch (@$ThisFileInfo['mpeg']['audio']['layer']) { 117 case 1: 118 case 2: 119 $ThisFileInfo['audio']['dataformat'] = 'mp'.$ThisFileInfo['mpeg']['audio']['layer']; 120 break; 121 } 122 if ($ThisFileInfo['fileformat'] == 'mp3') { 123 switch ($ThisFileInfo['audio']['dataformat']) { 124 case 'mp1': 125 case 'mp2': 126 case 'mp3': 127 $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat']; 128 break; 129 130 default: 131 $ThisFileInfo['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$ThisFileInfo['audio']['dataformat'].'"'; 132 break; 133 } 134 } 135 136 if (empty($ThisFileInfo['fileformat'])) { 137 unset($ThisFileInfo['fileformat']); 138 unset($ThisFileInfo['audio']['bitrate_mode']); 139 unset($ThisFileInfo['avdataoffset']); 140 unset($ThisFileInfo['avdataend']); 141 return false; 142 } 143 144 $ThisFileInfo['mime_type'] = 'audio/mpeg'; 145 $ThisFileInfo['audio']['lossless'] = false; 146 147 // Calculate playtime 148 if (!isset($ThisFileInfo['playtime_seconds']) && isset($ThisFileInfo['audio']['bitrate']) && ($ThisFileInfo['audio']['bitrate'] > 0)) { 149 $ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['audio']['bitrate']; 150 } 151 152 $ThisFileInfo['audio']['encoder_options'] = $this->GuessEncoderOptions($ThisFileInfo); 153 154 return true; 155 } 156 157 158 function GuessEncoderOptions(&$ThisFileInfo) { 159 // shortcuts 160 if (!empty($ThisFileInfo['mpeg']['audio'])) { 161 $thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio']; 162 if (!empty($thisfile_mpeg_audio['LAME'])) { 163 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; 164 } 165 } 166 167 $encoder_options = ''; 168 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256); 169 170 if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) { 171 172 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality']; 173 174 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) { 175 176 $encoder_options = $thisfile_mpeg_audio_lame['preset_used']; 177 178 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) { 179 180 static $KnownEncoderValues = array(); 181 if (empty($KnownEncoderValues)) { 182 183 //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name'; 184 $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92 185 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91 186 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95 187 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92 188 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91 189 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3 190 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92 191 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91 192 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 193 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3 194 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 195 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3 196 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92 197 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91 198 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95 199 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3 200 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3 201 202 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 203 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1 204 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93 205 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95 206 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 207 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1 208 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93 209 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95 210 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 211 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1 212 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95 213 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 214 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 215 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 216 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1 217 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95 218 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1 219 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95 220 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14 221 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92 222 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91 223 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1 224 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95 225 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14 226 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15 227 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1 228 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93 229 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95 230 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14 231 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15 232 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1 233 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93 234 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95 235 } 236 237 if (isset($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']])) { 238 239 $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']]; 240 241 } 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']])) { 242 243 $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']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; 244 245 } elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'vbr') { 246 247 // http://gabriel.mp3-tech.org/mp3infotag.html 248 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h 249 250 251 $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10); 252 $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10); 253 $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value; 254 255 } elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') { 256 257 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000); 258 259 } else { 260 261 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']); 262 263 } 264 265 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { 266 267 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr']; 268 269 } elseif (!empty($ThisFileInfo['audio']['bitrate'])) { 270 271 if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') { 272 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000); 273 } else { 274 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']); 275 } 276 277 } 278 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { 279 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min']; 280 } 281 282 if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) { 283 $encoder_options .= ' --nogap'; 284 } 285 286 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) { 287 $ExplodedOptions = explode(' ', $encoder_options, 4); 288 if ($ExplodedOptions[0] == '--r3mix') { 289 $ExplodedOptions[1] = 'r3mix'; 290 } 291 switch ($ExplodedOptions[0]) { 292 case '--preset': 293 case '--alt-preset': 294 case '--r3mix': 295 if ($ExplodedOptions[1] == 'fast') { 296 $ExplodedOptions[1] .= ' '.$ExplodedOptions[2]; 297 } 298 switch ($ExplodedOptions[1]) { 299 case 'portable': 300 case 'medium': 301 case 'standard': 302 case 'extreme': 303 case 'insane': 304 case 'fast portable': 305 case 'fast medium': 306 case 'fast standard': 307 case 'fast extreme': 308 case 'fast insane': 309 case 'r3mix': 310 static $ExpectedLowpass = array( 311 'insane|20500' => 20500, 312 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91 313 'medium|18000' => 18000, 314 'fast medium|18000' => 18000, 315 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 316 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 317 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 318 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 319 'standard|19000' => 19000, 320 'fast standard|19000' => 19000, 321 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92 322 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91 323 'r3mix|18000' => 18000, // 3.94, 3.95 324 ); 325 if (!isset($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))) { 326 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency']; 327 } 328 break; 329 330 default: 331 break; 332 } 333 break; 334 } 335 } 336 337 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { 338 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) { 339 $encoder_options .= ' --resample 44100'; 340 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) { 341 $encoder_options .= ' --resample 48000'; 342 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) { 343 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) { 344 case 0: // <= 32000 345 // may or may not be same as source frequency - ignore 346 break; 347 case 1: // 44100 348 case 2: // 48000 349 case 3: // 48000+ 350 $ExplodedOptions = explode(' ', $encoder_options, 4); 351 switch ($ExplodedOptions[0]) { 352 case '--preset': 353 case '--alt-preset': 354 switch ($ExplodedOptions[1]) { 355 case 'fast': 356 case 'portable': 357 case 'medium': 358 case 'standard': 359 case 'extreme': 360 case 'insane': 361 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 362 break; 363 364 default: 365 static $ExpectedResampledRate = array( 366 'phon+/lw/mw-eu/sw|16000' => 16000, 367 'mw-us|24000' => 24000, // 3.95 368 'mw-us|32000' => 32000, // 3.93 369 'mw-us|16000' => 16000, // 3.92 370 'phone|16000' => 16000, 371 'phone|11025' => 11025, // 3.94a15 372 'radio|32000' => 32000, // 3.94a15 373 'fm/radio|32000' => 32000, // 3.92 374 'fm|32000' => 32000, // 3.90 375 'voice|32000' => 32000); 376 if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) { 377 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 378 } 379 break; 380 } 381 break; 382 383 case '--r3mix': 384 default: 385 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 386 break; 387 } 388 break; 389 } 390 } 391 } 392 if (empty($encoder_options) && !empty($ThisFileInfo['audio']['bitrate']) && !empty($ThisFileInfo['audio']['bitrate_mode'])) { 393 //$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000); 394 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']); 395 } 396 397 return $encoder_options; 398 } 399 400 401 function decodeMPEGaudioHeader($fd, $offset, &$ThisFileInfo, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) { 402 403 static $MPEGaudioVersionLookup; 404 static $MPEGaudioLayerLookup; 405 static $MPEGaudioBitrateLookup; 406 static $MPEGaudioFrequencyLookup; 407 static $MPEGaudioChannelModeLookup; 408 static $MPEGaudioModeExtensionLookup; 409 static $MPEGaudioEmphasisLookup; 410 if (empty($MPEGaudioVersionLookup)) { 411 $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray(); 412 $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray(); 413 $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray(); 414 $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray(); 415 $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray(); 416 $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray(); 417 $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray(); 418 } 419 420 if ($offset >= $ThisFileInfo['avdataend']) { 421 $ThisFileInfo['error'][] = 'end of file encounter looking for MPEG synch'; 422 return false; 423 } 424 fseek($fd, $offset, SEEK_SET); 425 //$headerstring = fread($fd, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame 426 $headerstring = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data 427 428 // MP3 audio frame structure: 429 // $aa $aa $aa $aa [$bb $bb] $cc... 430 // where $aa..$aa is the four-byte mpeg-audio header (below) 431 // $bb $bb is the optional 2-byte CRC 432 // and $cc... is the audio data 433 434 $head4 = substr($headerstring, 0, 4); 435 436 static $MPEGaudioHeaderDecodeCache = array(); 437 if (isset($MPEGaudioHeaderDecodeCache[$head4])) { 438 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4]; 439 } else { 440 $MPEGheaderRawArray = getid3_mp3::MPEGaudioHeaderDecode($head4); 441 $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray; 442 } 443 444 static $MPEGaudioHeaderValidCache = array(); 445 446 // Not in cache 447 if (!isset($MPEGaudioHeaderValidCache[$head4])) { 448 //$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1) 449 $MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false); 450 } 451 452 // shortcut 453 if (!isset($ThisFileInfo['mpeg']['audio'])) { 454 $ThisFileInfo['mpeg']['audio'] = array(); 455 } 456 $thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio']; 457 458 459 if ($MPEGaudioHeaderValidCache[$head4]) { 460 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray; 461 } else { 462 $ThisFileInfo['error'][] = 'Invalid MPEG audio header at offset '.$offset; 463 return false; 464 } 465 466 if (!$FastMPEGheaderScan) { 467 468 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']]; 469 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']]; 470 471 $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']]; 472 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2); 473 $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']]; 474 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection']; 475 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private']; 476 $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']]; 477 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright']; 478 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original']; 479 $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']]; 480 481 $ThisFileInfo['audio']['channels'] = $thisfile_mpeg_audio['channels']; 482 $ThisFileInfo['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; 483 484 if ($thisfile_mpeg_audio['protection']) { 485 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2)); 486 } 487 488 } 489 490 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) { 491 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 492 $ThisFileInfo['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1'; 493 $thisfile_mpeg_audio['raw']['bitrate'] = 0; 494 } 495 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding']; 496 $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; 497 498 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $ThisFileInfo['avdataoffset'])) { 499 // only skip multiple frame check if free-format bitstream found at beginning of file 500 // otherwise is quite possibly simply corrupted data 501 $recursivesearch = false; 502 } 503 504 // For Layer 2 there are some combinations of bitrate and mode which are not allowed. 505 if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) { 506 507 $ThisFileInfo['audio']['dataformat'] = 'mp2'; 508 switch ($thisfile_mpeg_audio['channelmode']) { 509 510 case 'mono': 511 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { 512 // these are ok 513 } else { 514 $ThisFileInfo['error'][] = $thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'; 515 return false; 516 } 517 break; 518 519 case 'stereo': 520 case 'joint stereo': 521 case 'dual channel': 522 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { 523 // these are ok 524 } else { 525 $ThisFileInfo['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'; 526 return false; 527 } 528 break; 529 530 } 531 532 } 533 534 535 if ($ThisFileInfo['audio']['sample_rate'] > 0) { 536 $thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $ThisFileInfo['audio']['sample_rate']); 537 } 538 539 $nextframetestoffset = $offset + 1; 540 if ($thisfile_mpeg_audio['bitrate'] != 'free') { 541 542 $ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; 543 544 if (isset($thisfile_mpeg_audio['framelength'])) { 545 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength']; 546 } else { 547 $ThisFileInfo['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.'; 548 return false; 549 } 550 551 } 552 553 $ExpectedNumberOfAudioBytes = 0; 554 555 //////////////////////////////////////////////////////////////////////////////////// 556 // Variable-bitrate headers 557 558 if (substr($headerstring, 4 + 32, 4) == 'VBRI') { 559 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) 560 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html 561 562 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 563 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; 564 $ThisFileInfo['audio']['codec'] = 'Fraunhofer'; 565 566 $SideInfoData = substr($headerstring, 4 + 2, 32); 567 568 $FraunhoferVBROffset = 36; 569 570 $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion 571 $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay 572 $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality 573 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes 574 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames 575 $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize 576 $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale 577 $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes 578 $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames 579 580 $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes']; 581 582 $previousbyteoffset = $offset; 583 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { 584 $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes'])); 585 $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes']; 586 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']); 587 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset; 588 $previousbyteoffset += $Fraunhofer_OffsetN; 589 } 590 591 592 } else { 593 594 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36) 595 // depending on MPEG layer and number of channels 596 597 $VBRidOffset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); 598 $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4); 599 600 if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) { 601 // 'Xing' is traditional Xing VBR frame 602 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) 603 // 'Info' *can* legally be used to specify a VBR file as well, however. 604 605 // http://www.multiweb.cz/twoinches/MP3inside.htm 606 //00..03 = "Xing" or "Info" 607 //04..07 = Flags: 608 // 0x01 Frames Flag set if value for number of frames in file is stored 609 // 0x02 Bytes Flag set if value for filesize in bytes is stored 610 // 0x04 TOC Flag set if values for TOC are stored 611 // 0x08 VBR Scale Flag set if values for VBR scale is stored 612 //08..11 Frames: Number of frames in file (including the first Xing/Info one) 613 //12..15 Bytes: File length in Bytes 614 //16..115 TOC (Table of Contents): 615 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. 616 // Each Byte has a value according this formula: 617 // (TOC[i] / 256) * fileLenInBytes 618 // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use: 619 // TOC[(60/240)*100] = TOC[25] 620 // and corresponding Byte in file is then approximately at: 621 // (TOC[25]/256) * 5000000 622 //116..119 VBR Scale 623 624 625 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME 626 // if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') { 627 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 628 $thisfile_mpeg_audio['VBR_method'] = 'Xing'; 629 // } else { 630 // $ScanAsCBR = true; 631 // $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 632 // } 633 634 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4)); 635 636 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); 637 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); 638 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); 639 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); 640 641 if ($thisfile_mpeg_audio['xing_flags']['frames']) { 642 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4)); 643 //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame 644 } 645 if ($thisfile_mpeg_audio['xing_flags']['bytes']) { 646 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4)); 647 } 648 649 //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { 650 if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { 651 652 $framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']; 653 654 if ($thisfile_mpeg_audio['layer'] == '1') { 655 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 656 //$ThisFileInfo['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; 657 $ThisFileInfo['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 12; 658 } else { 659 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 660 //$ThisFileInfo['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; 661 $ThisFileInfo['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 144; 662 } 663 $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat); 664 } 665 666 if ($thisfile_mpeg_audio['xing_flags']['toc']) { 667 $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100); 668 for ($i = 0; $i < 100; $i++) { 669 $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i}); 670 } 671 } 672 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { 673 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4)); 674 } 675 676 677 // http://gabriel.mp3-tech.org/mp3infotag.html 678 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') { 679 680 // shortcut 681 $thisfile_mpeg_audio['LAME'] = array(); 682 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; 683 684 685 $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20); 686 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9); 687 688 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') { 689 690 // extra 11 chars are not part of version string when LAMEtag present 691 unset($thisfile_mpeg_audio_lame['long_version']); 692 693 // It the LAME tag was only introduced in LAME v3.90 694 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933 695 696 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html 697 // are assuming a 'Xing' identifier offset of 0x24, which is the case for 698 // MPEG-1 non-mono, but not for other combinations 699 $LAMEtagOffsetContant = $VBRidOffset - 0x24; 700 701 // shortcuts 702 $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array()); 703 $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD']; 704 $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track']; 705 $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album']; 706 $thisfile_mpeg_audio_lame['raw'] = array(); 707 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw']; 708 709 // byte $9B VBR Quality 710 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications. 711 // Actually overwrites original Xing bytes 712 unset($thisfile_mpeg_audio['VBR_scale']); 713 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1)); 714 715 // bytes $9C-$A4 Encoder short VersionString 716 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9); 717 718 // byte $A5 Info Tag revision + VBR method 719 $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1)); 720 721 $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4; 722 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F; 723 $thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']); 724 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr' 725 726 // byte $A6 Lowpass filter value 727 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100; 728 729 // bytes $A7-$AE Replay Gain 730 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html 731 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" 732 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') { 733 // LAME 3.94a16 and later - 9.23 fixed point 734 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375 735 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608); 736 } else { 737 // LAME 3.94a15 and earlier - 32-bit floating point 738 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15 739 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4)); 740 } 741 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) { 742 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); 743 } else { 744 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); 745 } 746 747 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2)); 748 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2)); 749 750 751 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) { 752 753 $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13; 754 $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10; 755 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9; 756 $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF; 757 $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']); 758 $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']); 759 $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']); 760 761 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { 762 $ThisFileInfo['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; 763 } 764 $ThisFileInfo['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator']; 765 $ThisFileInfo['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db']; 766 } else { 767 unset($thisfile_mpeg_audio_lame_RGAD['track']); 768 } 769 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) { 770 771 $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; 772 $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; 773 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; 774 $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; 775 $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']); 776 $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']); 777 $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']); 778 779 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { 780 $ThisFileInfo['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; 781 } 782 $ThisFileInfo['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator']; 783 $ThisFileInfo['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db']; 784 } else { 785 unset($thisfile_mpeg_audio_lame_RGAD['album']); 786 } 787 if (empty($thisfile_mpeg_audio_lame_RGAD)) { 788 unset($thisfile_mpeg_audio_lame['RGAD']); 789 } 790 791 792 // byte $AF Encoding flags + ATH Type 793 $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1)); 794 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10); 795 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20); 796 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40); 797 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80); 798 $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F; 799 800 // byte $B0 if ABR {specified bitrate} else {minimal bitrate} 801 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1)); 802 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR) 803 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; 804 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR) 805 // ignore 806 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate 807 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; 808 } 809 810 // bytes $B1-$B3 Encoder delays 811 $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3)); 812 $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12; 813 $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF; 814 815 // byte $B4 Misc 816 $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1)); 817 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03); 818 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2; 819 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5; 820 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6; 821 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping']; 822 $thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); 823 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality']; 824 $thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']); 825 826 // byte $B5 MP3 Gain 827 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true); 828 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain']; 829 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6)); 830 831 // bytes $B6-$B7 Preset and surround info 832 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2)); 833 // Reserved = ($PresetSurroundBytes & 0xC000); 834 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800); 835 $thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); 836 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); 837 $thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); 838 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { 839 $ThisFileInfo['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org'; 840 } 841 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) { 842 // this may change if 3.90.4 ever comes out 843 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3'; 844 } 845 846 // bytes $B8-$BB MusicLength 847 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4)); 848 $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); 849 850 // bytes $BC-$BD MusicCRC 851 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2)); 852 853 // bytes $BE-$BF CRC-16 of Info Tag 854 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2)); 855 856 857 // LAME CBR 858 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { 859 860 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 861 $thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); 862 $ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; 863 //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) { 864 // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min']; 865 //} 866 867 } 868 869 } 870 } 871 872 } else { 873 874 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) 875 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 876 if ($recursivesearch) { 877 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 878 if (getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, true)) { 879 $recursivesearch = false; 880 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 881 } 882 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { 883 $ThisFileInfo['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'; 884 } 885 } 886 887 } 888 889 } 890 891 if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']))) { 892 if ($ExpectedNumberOfAudioBytes > ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) { 893 if (($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) == 1) { 894 $ThisFileInfo['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'; 895 } else { 896 $ThisFileInfo['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])).' bytes)'; 897 } 898 } else { 899 if ((($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) { 900 // $prenullbytefileoffset = ftell($fd); 901 // fseek($fd, $ThisFileInfo['avdataend'], SEEK_SET); 902 // $PossibleNullByte = fread($fd, 1); 903 // fseek($fd, $prenullbytefileoffset, SEEK_SET); 904 // if ($PossibleNullByte === "\x00") { 905 $ThisFileInfo['avdataend']--; 906 // $ThisFileInfo['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored'; 907 // } else { 908 // $ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'; 909 // } 910 } else { 911 $ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'; 912 } 913 } 914 } 915 916 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($ThisFileInfo['audio']['bitrate'])) { 917 if (($offset == $ThisFileInfo['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { 918 $framebytelength = getid3_mp3::FreeFormatFrameLength($fd, $offset, $ThisFileInfo, true); 919 if ($framebytelength > 0) { 920 $thisfile_mpeg_audio['framelength'] = $framebytelength; 921 if ($thisfile_mpeg_audio['layer'] == '1') { 922 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 923 $ThisFileInfo['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; 924 } else { 925 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 926 $ThisFileInfo['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; 927 } 928 } else { 929 $ThisFileInfo['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header'; 930 } 931 } 932 } 933 934 if (!empty($thisfile_mpeg_audio['VBR_frames'])) { 935 switch ($thisfile_mpeg_audio['bitrate_mode']) { 936 case 'vbr': 937 case 'abr': 938 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) { 939 $thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 384); 940 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) { 941 $thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 576); 942 } else { 943 $thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 1152); 944 } 945 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { 946 $ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; 947 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion 948 } 949 break; 950 } 951 } 952 953 // End variable-bitrate headers 954 //////////////////////////////////////////////////////////////////////////////////// 955 956 if ($recursivesearch) { 957 958 if (!getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, $ScanAsCBR)) { 959 return false; 960 } 961 962 } 963 964 965 //if (false) { 966 // // experimental side info parsing section - not returning anything useful yet 967 // 968 // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData); 969 // $SideInfoOffset = 0; 970 // 971 // if ($thisfile_mpeg_audio['version'] == '1') { 972 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { 973 // // MPEG-1 (mono) 974 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); 975 // $SideInfoOffset += 9; 976 // $SideInfoOffset += 5; 977 // } else { 978 // // MPEG-1 (stereo, joint-stereo, dual-channel) 979 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); 980 // $SideInfoOffset += 9; 981 // $SideInfoOffset += 3; 982 // } 983 // } else { // 2 or 2.5 984 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { 985 // // MPEG-2, MPEG-2.5 (mono) 986 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); 987 // $SideInfoOffset += 8; 988 // $SideInfoOffset += 1; 989 // } else { 990 // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel) 991 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); 992 // $SideInfoOffset += 8; 993 // $SideInfoOffset += 2; 994 // } 995 // } 996 // 997 // if ($thisfile_mpeg_audio['version'] == '1') { 998 // for ($channel = 0; $channel < $ThisFileInfo['audio']['channels']; $channel++) { 999 // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) { 1000 // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1001 // $SideInfoOffset += 2; 1002 // } 1003 // } 1004 // } 1005 // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) { 1006 // for ($channel = 0; $channel < $ThisFileInfo['audio']['channels']; $channel++) { 1007 // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12); 1008 // $SideInfoOffset += 12; 1009 // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); 1010 // $SideInfoOffset += 9; 1011 // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8); 1012 // $SideInfoOffset += 8; 1013 // if ($thisfile_mpeg_audio['version'] == '1') { 1014 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); 1015 // $SideInfoOffset += 4; 1016 // } else { 1017 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); 1018 // $SideInfoOffset += 9; 1019 // } 1020 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1021 // $SideInfoOffset += 1; 1022 // 1023 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') { 1024 // 1025 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2); 1026 // $SideInfoOffset += 2; 1027 // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1028 // $SideInfoOffset += 1; 1029 // 1030 // for ($region = 0; $region < 2; $region++) { 1031 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); 1032 // $SideInfoOffset += 5; 1033 // } 1034 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0; 1035 // 1036 // for ($window = 0; $window < 3; $window++) { 1037 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3); 1038 // $SideInfoOffset += 3; 1039 // } 1040 // 1041 // } else { 1042 // 1043 // for ($region = 0; $region < 3; $region++) { 1044 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); 1045 // $SideInfoOffset += 5; 1046 // } 1047 // 1048 // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); 1049 // $SideInfoOffset += 4; 1050 // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3); 1051 // $SideInfoOffset += 3; 1052 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0; 1053 // } 1054 // 1055 // if ($thisfile_mpeg_audio['version'] == '1') { 1056 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1057 // $SideInfoOffset += 1; 1058 // } 1059 // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1060 // $SideInfoOffset += 1; 1061 // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1062 // $SideInfoOffset += 1; 1063 // } 1064 // } 1065 //} 1066 1067 return true; 1068 } 1069 1070 function RecursiveFrameScanning(&$fd, &$ThisFileInfo, &$offset, &$nextframetestoffset, $ScanAsCBR) { 1071 for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) { 1072 // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch 1073 if (($nextframetestoffset + 4) >= $ThisFileInfo['avdataend']) { 1074 // end of file 1075 return true; 1076 } 1077 1078 $nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']); 1079 if (getid3_mp3::decodeMPEGaudioHeader($fd, $nextframetestoffset, $nextframetestarray, false)) { 1080 if ($ScanAsCBR) { 1081 // force CBR mode, used for trying to pick out invalid audio streams with 1082 // valid(?) VBR headers, or VBR streams with no VBR header 1083 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($ThisFileInfo['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $ThisFileInfo['mpeg']['audio']['bitrate'])) { 1084 return false; 1085 } 1086 } 1087 1088 1089 // next frame is OK, get ready to check the one after that 1090 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) { 1091 $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength']; 1092 } else { 1093 $ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.'; 1094 return false; 1095 } 1096 1097 } else { 1098 1099 // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence 1100 $ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.'; 1101 1102 return false; 1103 } 1104 } 1105 return true; 1106 } 1107 1108 function FreeFormatFrameLength($fd, $offset, &$ThisFileInfo, $deepscan=false) { 1109 fseek($fd, $offset, SEEK_SET); 1110 $MPEGaudioData = fread($fd, 32768); 1111 1112 $SyncPattern1 = substr($MPEGaudioData, 0, 4); 1113 // may be different pattern due to padding 1114 $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3}; 1115 if ($SyncPattern2 === $SyncPattern1) { 1116 $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3}; 1117 } 1118 1119 $framelength = false; 1120 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4); 1121 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4); 1122 if ($framelength1 > 4) { 1123 $framelength = $framelength1; 1124 } 1125 if (($framelength2 > 4) && ($framelength2 < $framelength1)) { 1126 $framelength = $framelength2; 1127 } 1128 if (!$framelength) { 1129 1130 // LAME 3.88 has a different value for modeextension on the first frame vs the rest 1131 $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4); 1132 $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4); 1133 1134 if ($framelength1 > 4) { 1135 $framelength = $framelength1; 1136 } 1137 if (($framelength2 > 4) && ($framelength2 < $framelength1)) { 1138 $framelength = $framelength2; 1139 } 1140 if (!$framelength) { 1141 $ThisFileInfo['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset; 1142 return false; 1143 } else { 1144 $ThisFileInfo['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'; 1145 $ThisFileInfo['audio']['codec'] = 'LAME'; 1146 $ThisFileInfo['audio']['encoder'] = 'LAME3.88'; 1147 $SyncPattern1 = substr($SyncPattern1, 0, 3); 1148 $SyncPattern2 = substr($SyncPattern2, 0, 3); 1149 } 1150 } 1151 1152 if ($deepscan) { 1153 1154 $ActualFrameLengthValues = array(); 1155 $nextoffset = $offset + $framelength; 1156 while ($nextoffset < ($ThisFileInfo['avdataend'] - 6)) { 1157 fseek($fd, $nextoffset - 1, SEEK_SET); 1158 $NextSyncPattern = fread($fd, 6); 1159 if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) { 1160 // good - found where expected 1161 $ActualFrameLengthValues[] = $framelength; 1162 } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) { 1163 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was) 1164 $ActualFrameLengthValues[] = ($framelength - 1); 1165 $nextoffset--; 1166 } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) { 1167 // ok - found one byte later than expected (last frame was padded, first frame wasn't) 1168 $ActualFrameLengthValues[] = ($framelength + 1); 1169 $nextoffset++; 1170 } else { 1171 $ThisFileInfo['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset; 1172 return false; 1173 } 1174 $nextoffset += $framelength; 1175 } 1176 if (count($ActualFrameLengthValues) > 0) { 1177 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues))); 1178 } 1179 } 1180 return $framelength; 1181 } 1182 1183 function getOnlyMPEGaudioInfoBruteForce($fd, &$ThisFileInfo) { 1184 1185 $MPEGaudioHeaderDecodeCache = array(); 1186 $MPEGaudioHeaderValidCache = array(); 1187 $MPEGaudioHeaderLengthCache = array(); 1188 $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray(); 1189 $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray(); 1190 $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray(); 1191 $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray(); 1192 $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray(); 1193 $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray(); 1194 $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray(); 1195 $LongMPEGversionLookup = array(); 1196 $LongMPEGlayerLookup = array(); 1197 $LongMPEGbitrateLookup = array(); 1198 $LongMPEGpaddingLookup = array(); 1199 $LongMPEGfrequencyLookup = array(); 1200 1201 $Distribution['bitrate'] = array(); 1202 $Distribution['frequency'] = array(); 1203 $Distribution['layer'] = array(); 1204 $Distribution['version'] = array(); 1205 $Distribution['padding'] = array(); 1206 1207 fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); 1208 1209 $previousvalidframe = $ThisFileInfo['avdataoffset']; 1210 while (ftell($fd) < $ThisFileInfo['avdataend']) { 1211 set_time_limit(30); 1212 $head4 = fread($fd, 4); 1213 if (strlen($head4) < 4) { 1214 break; 1215 } 1216 if ($head4{0} != "\xFF") { 1217 for ($i = 1; $i < 4; $i++) { 1218 if ($head4{$i} == "\xFF") { 1219 fseek($fd, $i - 4, SEEK_CUR); 1220 continue 2; 1221 } 1222 } 1223 continue; 1224 } 1225 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) { 1226 $MPEGaudioHeaderDecodeCache[$head4] = getid3_mp3::MPEGaudioHeaderDecode($head4); 1227 } 1228 if (!isset($MPEGaudioHeaderValidCache[$head4])) { 1229 $MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false); 1230 } 1231 if ($MPEGaudioHeaderValidCache[$head4]) { 1232 1233 if (!isset($MPEGaudioHeaderLengthCache[$head4])) { 1234 $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']]; 1235 $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']]; 1236 $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']]; 1237 $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding']; 1238 $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']]; 1239 $MPEGaudioHeaderLengthCache[$head4] = getid3_mp3::MPEGaudioFrameLength( 1240 $LongMPEGbitrateLookup[$head4], 1241 $LongMPEGversionLookup[$head4], 1242 $LongMPEGlayerLookup[$head4], 1243 $LongMPEGpaddingLookup[$head4], 1244 $LongMPEGfrequencyLookup[$head4]); 1245 } 1246 if ($MPEGaudioHeaderLengthCache[$head4] > 4) { 1247 $WhereWeWere = ftell($fd); 1248 fseek($fd, $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR); 1249 $next4 = fread($fd, 4); 1250 if ($next4{0} == "\xFF") { 1251 if (!isset($MPEGaudioHeaderDecodeCache[$next4])) { 1252 $MPEGaudioHeaderDecodeCache[$next4] = getid3_mp3::MPEGaudioHeaderDecode($next4); 1253 } 1254 if (!isset($MPEGaudioHeaderValidCache[$next4])) { 1255 $MPEGaudioHeaderValidCache[$next4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false); 1256 } 1257 if ($MPEGaudioHeaderValidCache[$next4]) { 1258 fseek($fd, -4, SEEK_CUR); 1259 1260 @$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]++; 1261 @$Distribution['layer'][$LongMPEGlayerLookup[$head4]]++; 1262 @$Distribution['version'][$LongMPEGversionLookup[$head4]]++; 1263 @$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]++; 1264 @$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]++; 1265 continue; 1266 } 1267 } 1268 unset($next4); 1269 fseek($fd, $WhereWeWere - 3, SEEK_SET); 1270 } 1271 1272 } 1273 } 1274 foreach ($Distribution as $key => $value) { 1275 ksort($Distribution[$key], SORT_NUMERIC); 1276 } 1277 ksort($Distribution['version'], SORT_STRING); 1278 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate']; 1279 $ThisFileInfo['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency']; 1280 $ThisFileInfo['mpeg']['audio']['layer_distribution'] = $Distribution['layer']; 1281 $ThisFileInfo['mpeg']['audio']['version_distribution'] = $Distribution['version']; 1282 $ThisFileInfo['mpeg']['audio']['padding_distribution'] = $Distribution['padding']; 1283 if (count($Distribution['version']) > 1) { 1284 $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG version detected'; 1285 } 1286 if (count($Distribution['layer']) > 1) { 1287 $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG layer detected'; 1288 } 1289 if (count($Distribution['frequency']) > 1) { 1290 $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG sample rate detected'; 1291 } 1292 1293 1294 $bittotal = 0; 1295 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) { 1296 if ($bitratevalue != 'free') { 1297 $bittotal += ($bitratevalue * $bitratecount); 1298 } 1299 } 1300 $ThisFileInfo['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']); 1301 if ($ThisFileInfo['mpeg']['audio']['frame_count'] == 0) { 1302 $ThisFileInfo['error'][] = 'no MPEG audio frames found'; 1303 return false; 1304 } 1305 $ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $ThisFileInfo['mpeg']['audio']['frame_count']); 1306 $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr'); 1307 $ThisFileInfo['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true); 1308 1309 $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate']; 1310 $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode']; 1311 $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate']; 1312 $ThisFileInfo['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true); 1313 $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat']; 1314 1315 return true; 1316 } 1317 1318 1319 function getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram=false) { 1320 // looks for synch, decodes MPEG audio header 1321 1322 fseek($fd, $avdataoffset, SEEK_SET); 1323 $header = ''; 1324 $SynchSeekOffset = 0; 1325 1326 static $MPEGaudioVersionLookup; 1327 static $MPEGaudioLayerLookup; 1328 static $MPEGaudioBitrateLookup; 1329 if (empty($MPEGaudioVersionLookup)) { 1330 $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray(); 1331 $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray(); 1332 $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray(); 1333 1334 } 1335 1336 $header_len = strlen($header) - intval(round(GETID3_FREAD_BUFFER_SIZE / 2)); 1337 while (true) { 1338 1339 if (($SynchSeekOffset > $header_len) && (($avdataoffset + $SynchSeekOffset) < $ThisFileInfo['avdataend']) && !feof($fd)) { 1340 1341 if ($SynchSeekOffset > 131072) { 1342 // if a synch's not found within the first 128k bytes, then give up 1343 $ThisFileInfo['error'][] = 'could not find valid MPEG audio synch within the first 128k bytes'; 1344 if (isset($ThisFileInfo['audio']['bitrate'])) { 1345 unset($ThisFileInfo['audio']['bitrate']); 1346 } 1347 if (isset($ThisFileInfo['mpeg']['audio'])) { 1348 unset($ThisFileInfo['mpeg']['audio']); 1349 } 1350 if (empty($ThisFileInfo['mpeg'])) { 1351 unset($ThisFileInfo['mpeg']); 1352 } 1353 return false; 1354 1355 } elseif ($header .= fread($fd, GETID3_FREAD_BUFFER_SIZE)) { 1356 1357 // great 1358 $header_len = strlen($header) - intval(round(GETID3_FREAD_BUFFER_SIZE / 2)); 1359 1360 } else { 1361 1362 $ThisFileInfo['error'][] = 'could not find valid MPEG audio synch before end of file'; 1363 if (isset($ThisFileInfo['audio']['bitrate'])) { 1364 unset($ThisFileInfo['audio']['bitrate']); 1365 } 1366 if (isset($ThisFileInfo['mpeg']['audio'])) { 1367 unset($ThisFileInfo['mpeg']['audio']); 1368 } 1369 if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || (count($ThisFileInfo['mpeg']) == 0))) { 1370 unset($ThisFileInfo['mpeg']); 1371 } 1372 return false; 1373 1374 } 1375 } 1376 1377 if (($SynchSeekOffset + 1) >= strlen($header)) { 1378 $ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file'; 1379 return false; 1380 } 1381 1382 if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected 1383 1384 if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) { 1385 $FirstFrameThisfileInfo = $ThisFileInfo; 1386 $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset; 1387 if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) { 1388 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's 1389 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below 1390 unset($FirstFrameThisfileInfo); 1391 } 1392 } 1393 1394 $dummy = $ThisFileInfo; // only overwrite real data if valid header found 1395 if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) { 1396 $ThisFileInfo = $dummy; 1397 $ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset; 1398 switch ($ThisFileInfo['fileformat']) { 1399 case '': 1400 case 'id3': 1401 case 'ape': 1402 case 'mp3': 1403 $ThisFileInfo['fileformat'] = 'mp3'; 1404 $ThisFileInfo['audio']['dataformat'] = 'mp3'; 1405 break; 1406 } 1407 if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) { 1408 if (!(abs($ThisFileInfo['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) { 1409 // If there is garbage data between a valid VBR header frame and a sequence 1410 // of valid MPEG-audio frames the VBR data is no longer discarded. 1411 $ThisFileInfo = $FirstFrameThisfileInfo; 1412 $ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset; 1413 $ThisFileInfo['fileformat'] = 'mp3'; 1414 $ThisFileInfo['audio']['dataformat'] = 'mp3'; 1415 $dummy = $ThisFileInfo; 1416 unset($dummy['mpeg']['audio']); 1417 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength']; 1418 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset; 1419 if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) { 1420 1421 $ThisFileInfo = $dummy; 1422 $ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd; 1423 $ThisFileInfo['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd; 1424 1425 } else { 1426 1427 $ThisFileInfo['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')'; 1428 1429 } 1430 } 1431 } 1432 if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && ($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) { 1433 // VBR file with no VBR header 1434 $BitrateHistogram = true; 1435 } 1436 1437 if ($BitrateHistogram) { 1438 1439 $ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0); 1440 $ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0); 1441 1442 if ($ThisFileInfo['mpeg']['audio']['version'] == '1') { 1443 if ($ThisFileInfo['mpeg']['audio']['layer'] == 3) { 1444 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0); 1445 } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 2) { 1446 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0); 1447 } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) { 1448 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0); 1449 } 1450 } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) { 1451 $ThisFileInfo['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); 1452 } else { 1453 $ThisFileInfo['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); 1454 } 1455 1456 $dummy = array('error'=>$ThisFileInfo['error'], 'warning'=>$ThisFileInfo['warning'], 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']); 1457 $synchstartoffset = $ThisFileInfo['avdataoffset']; 1458 1459 $FastMode = false; 1460 $SynchErrorsFound = 0; 1461 while (getid3_mp3::decodeMPEGaudioHeader($fd, $synchstartoffset, $dummy, false, false, $FastMode)) { 1462 $FastMode = true; 1463 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']]; 1464 1465 if (empty($dummy['mpeg']['audio']['framelength'])) { 1466 $SynchErrorsFound++; 1467 } else { 1468 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++; 1469 $ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++; 1470 $ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++; 1471 1472 $synchstartoffset += $dummy['mpeg']['audio']['framelength']; 1473 } 1474 } 1475 if ($SynchErrorsFound > 0) { 1476 $ThisFileInfo['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis'; 1477 //return false; 1478 } 1479 1480 $bittotal = 0; 1481 $framecounter = 0; 1482 foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) { 1483 $framecounter += $bitratecount; 1484 if ($bitratevalue != 'free') { 1485 $bittotal += ($bitratevalue * $bitratecount); 1486 } 1487 } 1488 if ($framecounter == 0) { 1489 $ThisFileInfo['error'][] = 'Corrupt MP3 file: framecounter == zero'; 1490 return false; 1491 } 1492 $ThisFileInfo['mpeg']['audio']['frame_count'] = $framecounter; 1493 $ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter); 1494 1495 $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate']; 1496 1497 1498 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently 1499 $distinct_bitrates = 0; 1500 foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) { 1501 if ($bitrate_count > 0) { 1502 $distinct_bitrates++; 1503 } 1504 } 1505 if ($distinct_bitrates > 1) { 1506 $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr'; 1507 } else { 1508 $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr'; 1509 } 1510 $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode']; 1511 1512 } 1513 1514 break; // exit while() 1515 } 1516 } 1517 1518 $SynchSeekOffset++; 1519 if (($avdataoffset + $SynchSeekOffset) >= $ThisFileInfo['avdataend']) { 1520 // end of file/data 1521 1522 if (empty($ThisFileInfo['mpeg']['audio'])) { 1523 1524 $ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file'; 1525 if (isset($ThisFileInfo['audio']['bitrate'])) { 1526 unset($ThisFileInfo['audio']['bitrate']); 1527 } 1528 if (isset($ThisFileInfo['mpeg']['audio'])) { 1529 unset($ThisFileInfo['mpeg']['audio']); 1530 } 1531 if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || empty($ThisFileInfo['mpeg']))) { 1532 unset($ThisFileInfo['mpeg']); 1533 } 1534 return false; 1535 1536 } 1537 break; 1538 } 1539 1540 } 1541 $ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels']; 1542 $ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode']; 1543 $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate']; 1544 return true; 1545 } 1546 1547 1548 function MPEGaudioVersionArray() { 1549 static $MPEGaudioVersion = array('2.5', false, '2', '1'); 1550 return $MPEGaudioVersion; 1551 } 1552 1553 function MPEGaudioLayerArray() { 1554 static $MPEGaudioLayer = array(false, 3, 2, 1); 1555 return $MPEGaudioLayer; 1556 } 1557 1558 function MPEGaudioBitrateArray() { 1559 static $MPEGaudioBitrate; 1560 if (empty($MPEGaudioBitrate)) { 1561 $MPEGaudioBitrate = array ( 1562 '1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000), 1563 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000), 1564 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000) 1565 ), 1566 1567 '2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000), 1568 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000), 1569 ) 1570 ); 1571 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2]; 1572 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2']; 1573 } 1574 return $MPEGaudioBitrate; 1575 } 1576 1577 function MPEGaudioFrequencyArray() { 1578 static $MPEGaudioFrequency; 1579 if (empty($MPEGaudioFrequency)) { 1580 $MPEGaudioFrequency = array ( 1581 '1' => array(44100, 48000, 32000), 1582 '2' => array(22050, 24000, 16000), 1583 '2.5' => array(11025, 12000, 8000) 1584 ); 1585 } 1586 return $MPEGaudioFrequency; 1587 } 1588 1589 function MPEGaudioChannelModeArray() { 1590 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono'); 1591 return $MPEGaudioChannelMode; 1592 } 1593 1594 function MPEGaudioModeExtensionArray() { 1595 static $MPEGaudioModeExtension; 1596 if (empty($MPEGaudioModeExtension)) { 1597 $MPEGaudioModeExtension = array ( 1598 1 => array('4-31', '8-31', '12-31', '16-31'), 1599 2 => array('4-31', '8-31', '12-31', '16-31'), 1600 3 => array('', 'IS', 'MS', 'IS+MS') 1601 ); 1602 } 1603 return $MPEGaudioModeExtension; 1604 } 1605 1606 function MPEGaudioEmphasisArray() { 1607 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17'); 1608 return $MPEGaudioEmphasis; 1609 } 1610 1611 function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) { 1612 return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allowBitrate15); 1613 } 1614 1615 function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) { 1616 if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) { 1617 return false; 1618 } 1619 1620 static $MPEGaudioVersionLookup; 1621 static $MPEGaudioLayerLookup; 1622 static $MPEGaudioBitrateLookup; 1623 static $MPEGaudioFrequencyLookup; 1624 static $MPEGaudioChannelModeLookup; 1625 static $MPEGaudioModeExtensionLookup; 1626 static $MPEGaudioEmphasisLookup; 1627 if (empty($MPEGaudioVersionLookup)) { 1628 $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray(); 1629 $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray(); 1630 $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray(); 1631 $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray(); 1632 $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray(); 1633 $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray(); 1634 $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray(); 1635 } 1636 1637 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) { 1638 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']]; 1639 } else { 1640 echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : ''); 1641 return false; 1642 } 1643 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) { 1644 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']]; 1645 } else { 1646 echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : ''); 1647 return false; 1648 } 1649 if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) { 1650 echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : ''); 1651 if ($rawarray['bitrate'] == 15) { 1652 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0 1653 // let it go through here otherwise file will not be identified 1654 if (!$allowBitrate15) { 1655 return false; 1656 } 1657 } else { 1658 return false; 1659 } 1660 } 1661 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) { 1662 echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : ''); 1663 return false; 1664 } 1665 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) { 1666 echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : ''); 1667 return false; 1668 } 1669 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) { 1670 echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : ''); 1671 return false; 1672 } 1673 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) { 1674 echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : ''); 1675 return false; 1676 } 1677 // These are just either set or not set, you can't mess that up :) 1678 // $rawarray['protection']; 1679 // $rawarray['padding']; 1680 // $rawarray['private']; 1681 // $rawarray['copyright']; 1682 // $rawarray['original']; 1683 1684 return true; 1685 } 1686 1687 function MPEGaudioHeaderDecode($Header4Bytes) { 1688 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM 1689 // A - Frame sync (all bits set) 1690 // B - MPEG Audio version ID 1691 // C - Layer description 1692 // D - Protection bit 1693 // E - Bitrate index 1694 // F - Sampling rate frequency index 1695 // G - Padding bit 1696 // H - Private bit 1697 // I - Channel Mode 1698 // J - Mode extension (Only if Joint stereo) 1699 // K - Copyright 1700 // L - Original 1701 // M - Emphasis 1702 1703 if (strlen($Header4Bytes) != 4) { 1704 return false; 1705 } 1706 1707 $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4; 1708 $MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB 1709 $MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC 1710 $MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D 1711 $MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE 1712 $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF 1713 $MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G 1714 $MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H 1715 $MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II 1716 $MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ 1717 $MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K 1718 $MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L 1719 $MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM 1720 1721 return $MPEGrawHeader; 1722 } 1723 1724 function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) { 1725 static $AudioFrameLengthCache = array(); 1726 1727 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) { 1728 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false; 1729 if ($bitrate != 'free') { 1730 1731 if ($version == '1') { 1732 1733 if ($layer == '1') { 1734 1735 // For Layer I slot is 32 bits long 1736 $FrameLengthCoefficient = 48; 1737 $SlotLength = 4; 1738 1739 } else { // Layer 2 / 3 1740 1741 // for Layer 2 and Layer 3 slot is 8 bits long. 1742 $FrameLengthCoefficient = 144; 1743 $SlotLength = 1; 1744 1745 } 1746 1747 } else { // MPEG-2 / MPEG-2.5 1748 1749 if ($layer == '1') { 1750 1751 // For Layer I slot is 32 bits long 1752 $FrameLengthCoefficient = 24; 1753 $SlotLength = 4; 1754 1755 } elseif ($layer == '2') { 1756 1757 // for Layer 2 and Layer 3 slot is 8 bits long. 1758 $FrameLengthCoefficient = 144; 1759 $SlotLength = 1; 1760 1761 } else { // layer 3 1762 1763 // for Layer 2 and Layer 3 slot is 8 bits long. 1764 $FrameLengthCoefficient = 72; 1765 $SlotLength = 1; 1766 1767 } 1768 1769 } 1770 1771 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding 1772 if ($samplerate > 0) { 1773 $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate; 1774 $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I) 1775 if ($padding) { 1776 $NewFramelength += $SlotLength; 1777 } 1778 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength; 1779 } 1780 } 1781 } 1782 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate]; 1783 } 1784 1785 function ClosestStandardMP3Bitrate($bitrate) { 1786 static $StandardBitrates = array(320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000); 1787 static $BitrateTable = array(0=>'-'); 1788 $roundbitrate = intval(round($bitrate, -3)); 1789 if (!isset($BitrateTable[$roundbitrate])) { 1790 if ($roundbitrate > 320000) { 1791 $BitrateTable[$roundbitrate] = round($bitrate, -4); 1792 } else { 1793 $LastBitrate = 320000; 1794 foreach ($StandardBitrates as $StandardBitrate) { 1795 $BitrateTable[$roundbitrate] = $StandardBitrate; 1796 if ($roundbitrate >= $StandardBitrate - (($LastBitrate - $StandardBitrate) / 2)) { 1797 break; 1798 } 1799 $LastBitrate = $StandardBitrate; 1800 } 1801 } 1802 } 1803 return $BitrateTable[$roundbitrate]; 1804 } 1805 1806 function XingVBRidOffset($version, $channelmode) { 1807 static $XingVBRidOffsetCache = array(); 1808 if (empty($XingVBRidOffset)) { 1809 $XingVBRidOffset = array ( 1810 '1' => array ('mono' => 0x15, // 4 + 17 = 21 1811 'stereo' => 0x24, // 4 + 32 = 36 1812 'joint stereo' => 0x24, 1813 'dual channel' => 0x24 1814 ), 1815 1816 '2' => array ('mono' => 0x0D, // 4 + 9 = 13 1817 'stereo' => 0x15, // 4 + 17 = 21 1818 'joint stereo' => 0x15, 1819 'dual channel' => 0x15 1820 ), 1821 1822 '2.5' => array ('mono' => 0x15, 1823 'stereo' => 0x15, 1824 'joint stereo' => 0x15, 1825 'dual channel' => 0x15 1826 ) 1827 ); 1828 } 1829 return $XingVBRidOffset[$version][$channelmode]; 1830 } 1831 1832 function LAMEvbrMethodLookup($VBRmethodID) { 1833 static $LAMEvbrMethodLookup = array( 1834 0x00 => 'unknown', 1835 0x01 => 'cbr', 1836 0x02 => 'abr', 1837 0x03 => 'vbr-old / vbr-rh', 1838 0x04 => 'vbr-new / vbr-mtrh', 1839 0x05 => 'vbr-mt', 1840 0x06 => 'Full VBR Method 4', 1841 0x08 => 'constant bitrate 2 pass', 1842 0x09 => 'abr 2 pass', 1843 0x0F => 'reserved' 1844 ); 1845 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : ''); 1846 } 1847 1848 function LAMEmiscStereoModeLookup($StereoModeID) { 1849 static $LAMEmiscStereoModeLookup = array( 1850 0 => 'mono', 1851 1 => 'stereo', 1852 2 => 'dual mono', 1853 3 => 'joint stereo', 1854 4 => 'forced stereo', 1855 5 => 'auto', 1856 6 => 'intensity stereo', 1857 7 => 'other' 1858 ); 1859 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : ''); 1860 } 1861 1862 function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) { 1863 static $LAMEmiscSourceSampleFrequencyLookup = array( 1864 0 => '<= 32 kHz', 1865 1 => '44.1 kHz', 1866 2 => '48 kHz', 1867 3 => '> 48kHz' 1868 ); 1869 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : ''); 1870 } 1871 1872 function LAMEsurroundInfoLookup($SurroundInfoID) { 1873 static $LAMEsurroundInfoLookup = array( 1874 0 => 'no surround info', 1875 1 => 'DPL encoding', 1876 2 => 'DPL2 encoding', 1877 3 => 'Ambisonic encoding' 1878 ); 1879 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved'); 1880 } 1881 1882 function LAMEpresetUsedLookup($LAMEtag) { 1883 1884 if ($LAMEtag['preset_used_id'] == 0) { 1885 // no preset used (LAME >=3.93) 1886 // no preset recorded (LAME <3.93) 1887 return ''; 1888 } 1889 $LAMEpresetUsedLookup = array(); 1890 1891 ///// THIS PART CANNOT BE STATIC . 1892 for ($i = 8; $i <= 320; $i++) { 1893 switch ($LAMEtag['vbr_method']) { 1894 case 'cbr': 1895 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i; 1896 break; 1897 case 'abr': 1898 default: // other VBR modes shouldn't be here(?) 1899 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i; 1900 break; 1901 } 1902 } 1903 1904 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions() 1905 1906 // named alt-presets 1907 $LAMEpresetUsedLookup[1000] = '--r3mix'; 1908 $LAMEpresetUsedLookup[1001] = '--alt-preset standard'; 1909 $LAMEpresetUsedLookup[1002] = '--alt-preset extreme'; 1910 $LAMEpresetUsedLookup[1003] = '--alt-preset insane'; 1911 $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard'; 1912 $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme'; 1913 $LAMEpresetUsedLookup[1006] = '--alt-preset medium'; 1914 $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium'; 1915 1916 // LAME 3.94 additions/changes 1917 $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003 1918 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003 1919 1920 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003 1921 $LAMEpresetUsedLookup[410] = '-V9'; 1922 $LAMEpresetUsedLookup[420] = '-V8'; 1923 $LAMEpresetUsedLookup[440] = '-V6'; 1924 $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003 1925 $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003 1926 $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003 1927 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003 1928 $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003 1929 $LAMEpresetUsedLookup[490] = '-V1'; 1930 $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003 1931 1932 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org'); 1933 } 1934 1935 } 1936 1937 ?>
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| Généré le : Mon Nov 26 21:04:15 2007 | par Balluche grâce à PHPXref 0.7 |
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