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1 <?php 2 3 ///////////////////////////////////////////////////////////////// 4 /// getID3() by James Heinrich <info@getid3.org> // 5 // available at https://github.com/JamesHeinrich/getID3 // 6 // or https://www.getid3.org // 7 // or http://getid3.sourceforge.net // 8 // see readme.txt for more details // 9 ///////////////////////////////////////////////////////////////// 10 // // 11 // module.audio.mp3.php // 12 // module for analyzing MP3 files // 13 // dependencies: NONE // 14 // /// 15 ///////////////////////////////////////////////////////////////// 16 17 18 // number of frames to scan to determine if MPEG-audio sequence is valid 19 // Lower this number to 5-20 for faster scanning 20 // Increase this number to 50+ for most accurate detection of valid VBR/CBR 21 // mpeg-audio streams 22 define('GETID3_MP3_VALID_CHECK_FRAMES', 35); 23 24 25 class getid3_mp3 extends getid3_handler 26 { 27 /** 28 * Forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, 29 * unrecommended, but may provide data from otherwise-unusable files. 30 * 31 * @var bool 32 */ 33 public $allow_bruteforce = false; 34 35 /** 36 * @return bool 37 */ 38 public function Analyze() { 39 $info = &$this->getid3->info; 40 41 $initialOffset = $info['avdataoffset']; 42 43 if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) { 44 if ($this->allow_bruteforce) { 45 $this->error('Rescanning file in BruteForce mode'); 46 $this->getOnlyMPEGaudioInfoBruteForce(); 47 } 48 } 49 50 51 if (isset($info['mpeg']['audio']['bitrate_mode'])) { 52 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']); 53 } 54 55 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) { 56 57 $synchoffsetwarning = 'Unknown data before synch '; 58 if (isset($info['id3v2']['headerlength'])) { 59 $synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, '; 60 } elseif ($initialOffset > 0) { 61 $synchoffsetwarning .= '(should be at '.$initialOffset.', '; 62 } else { 63 $synchoffsetwarning .= '(should be at beginning of file, '; 64 } 65 $synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')'; 66 if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) { 67 68 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) { 69 70 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.'; 71 $info['audio']['codec'] = 'LAME'; 72 $CurrentDataLAMEversionString = 'LAME3.'; 73 74 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) { 75 76 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.'; 77 $info['audio']['codec'] = 'LAME'; 78 $CurrentDataLAMEversionString = 'LAME3.'; 79 80 } 81 82 } 83 $this->warning($synchoffsetwarning); 84 85 } 86 87 if (isset($info['mpeg']['audio']['LAME'])) { 88 $info['audio']['codec'] = 'LAME'; 89 if (!empty($info['mpeg']['audio']['LAME']['long_version'])) { 90 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00"); 91 } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) { 92 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00"); 93 } 94 } 95 96 $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : '')); 97 if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) { 98 // a version number of LAME that does not end with a number like "LAME3.92" 99 // or with a closing parenthesis like "LAME3.88 (alpha)" 100 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92) 101 102 // not sure what the actual last frame length will be, but will be less than or equal to 1441 103 $PossiblyLongerLAMEversion_FrameLength = 1441; 104 105 // Not sure what version of LAME this is - look in padding of last frame for longer version string 106 $PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength; 107 $this->fseek($PossibleLAMEversionStringOffset); 108 $PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength); 109 switch (substr($CurrentDataLAMEversionString, -1)) { 110 case 'a': 111 case 'b': 112 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example 113 // need to trim off "a" to match longer string 114 $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1); 115 break; 116 } 117 if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) { 118 if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) { 119 $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)" 120 if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) { 121 $info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString; 122 } 123 } 124 } 125 } 126 if (!empty($info['audio']['encoder'])) { 127 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 "); 128 } 129 130 switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') { 131 case 1: 132 case 2: 133 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer']; 134 break; 135 } 136 if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) { 137 switch ($info['audio']['dataformat']) { 138 case 'mp1': 139 case 'mp2': 140 case 'mp3': 141 $info['fileformat'] = $info['audio']['dataformat']; 142 break; 143 144 default: 145 $this->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"'); 146 break; 147 } 148 } 149 150 if (empty($info['fileformat'])) { 151 unset($info['fileformat']); 152 unset($info['audio']['bitrate_mode']); 153 unset($info['avdataoffset']); 154 unset($info['avdataend']); 155 return false; 156 } 157 158 $info['mime_type'] = 'audio/mpeg'; 159 $info['audio']['lossless'] = false; 160 161 // Calculate playtime 162 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) { 163 // https://github.com/JamesHeinrich/getID3/issues/161 164 // VBR header frame contains ~0.026s of silent audio data, but is not actually part of the original encoding and should be ignored 165 $xingVBRheaderFrameLength = ((isset($info['mpeg']['audio']['VBR_frames']) && isset($info['mpeg']['audio']['framelength'])) ? $info['mpeg']['audio']['framelength'] : 0); 166 167 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset'] - $xingVBRheaderFrameLength) * 8 / $info['audio']['bitrate']; 168 } 169 170 $info['audio']['encoder_options'] = $this->GuessEncoderOptions(); 171 172 return true; 173 } 174 175 /** 176 * @return string 177 */ 178 public function GuessEncoderOptions() { 179 // shortcuts 180 $info = &$this->getid3->info; 181 $thisfile_mpeg_audio = array(); 182 $thisfile_mpeg_audio_lame = array(); 183 if (!empty($info['mpeg']['audio'])) { 184 $thisfile_mpeg_audio = &$info['mpeg']['audio']; 185 if (!empty($thisfile_mpeg_audio['LAME'])) { 186 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; 187 } 188 } 189 190 $encoder_options = ''; 191 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256); 192 193 if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) { 194 195 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality']; 196 197 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && isset($thisfile_mpeg_audio_lame['preset_used_id']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) { 198 199 $encoder_options = $thisfile_mpeg_audio_lame['preset_used']; 200 201 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) { 202 203 static $KnownEncoderValues = array(); 204 if (empty($KnownEncoderValues)) { 205 206 //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name'; 207 $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92 208 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91 209 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95 210 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92 211 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91 212 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3 213 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92 214 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91 215 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 216 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3 217 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 218 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3 219 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92 220 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91 221 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95 222 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3 223 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3 224 225 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 226 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1 227 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93 228 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95 229 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 230 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1 231 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93 232 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95 233 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 234 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1 235 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95 236 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 237 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 238 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 239 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1 240 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95 241 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1 242 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95 243 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14 244 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92 245 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91 246 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1 247 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95 248 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14 249 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15 250 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1 251 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93 252 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95 253 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14 254 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15 255 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1 256 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93 257 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95 258 } 259 260 if (isset($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']])) { 261 262 $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']]; 263 264 } 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']])) { 265 266 $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']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; 267 268 } elseif ($info['audio']['bitrate_mode'] == 'vbr') { 269 270 // http://gabriel.mp3-tech.org/mp3infotag.html 271 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h 272 273 274 $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10); 275 $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10); 276 $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value; 277 278 } elseif ($info['audio']['bitrate_mode'] == 'cbr') { 279 280 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); 281 282 } else { 283 284 $encoder_options = strtoupper($info['audio']['bitrate_mode']); 285 286 } 287 288 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { 289 290 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr']; 291 292 } elseif (!empty($info['audio']['bitrate'])) { 293 294 if ($info['audio']['bitrate_mode'] == 'cbr') { 295 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); 296 } else { 297 $encoder_options = strtoupper($info['audio']['bitrate_mode']); 298 } 299 300 } 301 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { 302 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min']; 303 } 304 305 if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) { 306 $encoder_options .= ' --nogap'; 307 } 308 309 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) { 310 $ExplodedOptions = explode(' ', $encoder_options, 4); 311 if ($ExplodedOptions[0] == '--r3mix') { 312 $ExplodedOptions[1] = 'r3mix'; 313 } 314 switch ($ExplodedOptions[0]) { 315 case '--preset': 316 case '--alt-preset': 317 case '--r3mix': 318 if ($ExplodedOptions[1] == 'fast') { 319 $ExplodedOptions[1] .= ' '.$ExplodedOptions[2]; 320 } 321 switch ($ExplodedOptions[1]) { 322 case 'portable': 323 case 'medium': 324 case 'standard': 325 case 'extreme': 326 case 'insane': 327 case 'fast portable': 328 case 'fast medium': 329 case 'fast standard': 330 case 'fast extreme': 331 case 'fast insane': 332 case 'r3mix': 333 static $ExpectedLowpass = array( 334 'insane|20500' => 20500, 335 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91 336 'medium|18000' => 18000, 337 'fast medium|18000' => 18000, 338 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 339 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 340 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 341 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 342 'standard|19000' => 19000, 343 'fast standard|19000' => 19000, 344 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92 345 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91 346 'r3mix|18000' => 18000, // 3.94, 3.95 347 ); 348 if (!isset($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))) { 349 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency']; 350 } 351 break; 352 353 default: 354 break; 355 } 356 break; 357 } 358 } 359 360 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { 361 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) { 362 $encoder_options .= ' --resample 44100'; 363 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) { 364 $encoder_options .= ' --resample 48000'; 365 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) { 366 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) { 367 case 0: // <= 32000 368 // may or may not be same as source frequency - ignore 369 break; 370 case 1: // 44100 371 case 2: // 48000 372 case 3: // 48000+ 373 $ExplodedOptions = explode(' ', $encoder_options, 4); 374 switch ($ExplodedOptions[0]) { 375 case '--preset': 376 case '--alt-preset': 377 switch ($ExplodedOptions[1]) { 378 case 'fast': 379 case 'portable': 380 case 'medium': 381 case 'standard': 382 case 'extreme': 383 case 'insane': 384 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 385 break; 386 387 default: 388 static $ExpectedResampledRate = array( 389 'phon+/lw/mw-eu/sw|16000' => 16000, 390 'mw-us|24000' => 24000, // 3.95 391 'mw-us|32000' => 32000, // 3.93 392 'mw-us|16000' => 16000, // 3.92 393 'phone|16000' => 16000, 394 'phone|11025' => 11025, // 3.94a15 395 'radio|32000' => 32000, // 3.94a15 396 'fm/radio|32000' => 32000, // 3.92 397 'fm|32000' => 32000, // 3.90 398 'voice|32000' => 32000); 399 if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) { 400 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 401 } 402 break; 403 } 404 break; 405 406 case '--r3mix': 407 default: 408 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 409 break; 410 } 411 break; 412 } 413 } 414 } 415 if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) { 416 //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); 417 $encoder_options = strtoupper($info['audio']['bitrate_mode']); 418 } 419 420 return $encoder_options; 421 } 422 423 /** 424 * @param int $offset 425 * @param array $info 426 * @param bool $recursivesearch 427 * @param bool $ScanAsCBR 428 * @param bool $FastMPEGheaderScan 429 * 430 * @return bool 431 */ 432 public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) { 433 static $MPEGaudioVersionLookup; 434 static $MPEGaudioLayerLookup; 435 static $MPEGaudioBitrateLookup; 436 static $MPEGaudioFrequencyLookup; 437 static $MPEGaudioChannelModeLookup; 438 static $MPEGaudioModeExtensionLookup; 439 static $MPEGaudioEmphasisLookup; 440 if (empty($MPEGaudioVersionLookup)) { 441 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); 442 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); 443 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); 444 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); 445 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); 446 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); 447 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); 448 } 449 450 if ($this->fseek($offset) != 0) { 451 $this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$offset); 452 return false; 453 } 454 //$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame 455 $headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data 456 457 // MP3 audio frame structure: 458 // $aa $aa $aa $aa [$bb $bb] $cc... 459 // where $aa..$aa is the four-byte mpeg-audio header (below) 460 // $bb $bb is the optional 2-byte CRC 461 // and $cc... is the audio data 462 463 $head4 = substr($headerstring, 0, 4); 464 $head4_key = getid3_lib::PrintHexBytes($head4, true, false, false); 465 static $MPEGaudioHeaderDecodeCache = array(); 466 if (isset($MPEGaudioHeaderDecodeCache[$head4_key])) { 467 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4_key]; 468 } else { 469 $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4); 470 $MPEGaudioHeaderDecodeCache[$head4_key] = $MPEGheaderRawArray; 471 } 472 473 static $MPEGaudioHeaderValidCache = array(); 474 if (!isset($MPEGaudioHeaderValidCache[$head4_key])) { // Not in cache 475 //$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1) 476 $MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false); 477 } 478 479 // shortcut 480 if (!isset($info['mpeg']['audio'])) { 481 $info['mpeg']['audio'] = array(); 482 } 483 $thisfile_mpeg_audio = &$info['mpeg']['audio']; 484 485 if ($MPEGaudioHeaderValidCache[$head4_key]) { 486 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray; 487 } else { 488 $this->error('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset); 489 return false; 490 } 491 492 if (!$FastMPEGheaderScan) { 493 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']]; 494 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']]; 495 496 $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']]; 497 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2); 498 $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']]; 499 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection']; 500 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private']; 501 $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']]; 502 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright']; 503 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original']; 504 $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']]; 505 506 $info['audio']['channels'] = $thisfile_mpeg_audio['channels']; 507 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; 508 509 if ($thisfile_mpeg_audio['protection']) { 510 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2)); 511 } 512 } 513 514 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) { 515 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 516 $this->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1'); 517 $thisfile_mpeg_audio['raw']['bitrate'] = 0; 518 } 519 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding']; 520 $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; 521 522 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) { 523 // only skip multiple frame check if free-format bitstream found at beginning of file 524 // otherwise is quite possibly simply corrupted data 525 $recursivesearch = false; 526 } 527 528 // For Layer 2 there are some combinations of bitrate and mode which are not allowed. 529 if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) { 530 531 $info['audio']['dataformat'] = 'mp2'; 532 switch ($thisfile_mpeg_audio['channelmode']) { 533 534 case 'mono': 535 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { 536 // these are ok 537 } else { 538 $this->error($thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'); 539 return false; 540 } 541 break; 542 543 case 'stereo': 544 case 'joint stereo': 545 case 'dual channel': 546 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { 547 // these are ok 548 } else { 549 $this->error(intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'); 550 return false; 551 } 552 break; 553 554 } 555 556 } 557 558 559 if ($info['audio']['sample_rate'] > 0) { 560 $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']); 561 } 562 563 $nextframetestoffset = $offset + 1; 564 if ($thisfile_mpeg_audio['bitrate'] != 'free') { 565 566 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; 567 568 if (isset($thisfile_mpeg_audio['framelength'])) { 569 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength']; 570 } else { 571 $this->error('Frame at offset('.$offset.') is has an invalid frame length.'); 572 return false; 573 } 574 575 } 576 577 $ExpectedNumberOfAudioBytes = 0; 578 579 //////////////////////////////////////////////////////////////////////////////////// 580 // Variable-bitrate headers 581 582 if (substr($headerstring, 4 + 32, 4) == 'VBRI') { 583 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) 584 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html 585 586 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 587 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; 588 $info['audio']['codec'] = 'Fraunhofer'; 589 590 $SideInfoData = substr($headerstring, 4 + 2, 32); 591 592 $FraunhoferVBROffset = 36; 593 594 $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion 595 $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay 596 $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality 597 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes 598 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames 599 $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize 600 $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale 601 $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes 602 $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames 603 604 $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes']; 605 606 $previousbyteoffset = $offset; 607 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { 608 $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes'])); 609 $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes']; 610 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']); 611 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset; 612 $previousbyteoffset += $Fraunhofer_OffsetN; 613 } 614 615 616 } else { 617 618 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36) 619 // depending on MPEG layer and number of channels 620 621 $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); 622 $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4); 623 624 if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) { 625 // 'Xing' is traditional Xing VBR frame 626 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) 627 // 'Info' *can* legally be used to specify a VBR file as well, however. 628 629 // http://www.multiweb.cz/twoinches/MP3inside.htm 630 //00..03 = "Xing" or "Info" 631 //04..07 = Flags: 632 // 0x01 Frames Flag set if value for number of frames in file is stored 633 // 0x02 Bytes Flag set if value for filesize in bytes is stored 634 // 0x04 TOC Flag set if values for TOC are stored 635 // 0x08 VBR Scale Flag set if values for VBR scale is stored 636 //08..11 Frames: Number of frames in file (including the first Xing/Info one) 637 //12..15 Bytes: File length in Bytes 638 //16..115 TOC (Table of Contents): 639 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. 640 // Each Byte has a value according this formula: 641 // (TOC[i] / 256) * fileLenInBytes 642 // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use: 643 // TOC[(60/240)*100] = TOC[25] 644 // and corresponding Byte in file is then approximately at: 645 // (TOC[25]/256) * 5000000 646 //116..119 VBR Scale 647 648 649 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME 650 // if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') { 651 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 652 $thisfile_mpeg_audio['VBR_method'] = 'Xing'; 653 // } else { 654 // $ScanAsCBR = true; 655 // $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 656 // } 657 658 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4)); 659 660 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); 661 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); 662 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); 663 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); 664 665 if ($thisfile_mpeg_audio['xing_flags']['frames']) { 666 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4)); 667 //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame 668 } 669 if ($thisfile_mpeg_audio['xing_flags']['bytes']) { 670 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4)); 671 } 672 673 //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { 674 //if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { 675 if (!empty($thisfile_mpeg_audio['VBR_frames'])) { 676 $used_filesize = 0; 677 if (!empty($thisfile_mpeg_audio['VBR_bytes'])) { 678 $used_filesize = $thisfile_mpeg_audio['VBR_bytes']; 679 } elseif (!empty($info['filesize'])) { 680 $used_filesize = $info['filesize']; 681 $used_filesize -= (isset($info['id3v2']['headerlength']) ? intval($info['id3v2']['headerlength']) : 0); 682 $used_filesize -= (isset($info['id3v1']) ? 128 : 0); 683 $used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0); 684 $this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes'); 685 } 686 687 $framelengthfloat = $used_filesize / $thisfile_mpeg_audio['VBR_frames']; 688 689 if ($thisfile_mpeg_audio['layer'] == '1') { 690 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 691 //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; 692 $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12; 693 } else { 694 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 695 //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; 696 $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144; 697 } 698 $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat); 699 } 700 701 if ($thisfile_mpeg_audio['xing_flags']['toc']) { 702 $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100); 703 for ($i = 0; $i < 100; $i++) { 704 $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData[$i]); 705 } 706 } 707 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { 708 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4)); 709 } 710 711 712 // http://gabriel.mp3-tech.org/mp3infotag.html 713 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') { 714 715 // shortcut 716 $thisfile_mpeg_audio['LAME'] = array(); 717 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; 718 719 720 $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20); 721 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9); 722 723 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') { 724 725 // extra 11 chars are not part of version string when LAMEtag present 726 unset($thisfile_mpeg_audio_lame['long_version']); 727 728 // It the LAME tag was only introduced in LAME v3.90 729 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933 730 731 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html 732 // are assuming a 'Xing' identifier offset of 0x24, which is the case for 733 // MPEG-1 non-mono, but not for other combinations 734 $LAMEtagOffsetContant = $VBRidOffset - 0x24; 735 736 // shortcuts 737 $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array()); 738 $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD']; 739 $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track']; 740 $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album']; 741 $thisfile_mpeg_audio_lame['raw'] = array(); 742 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw']; 743 744 // byte $9B VBR Quality 745 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications. 746 // Actually overwrites original Xing bytes 747 unset($thisfile_mpeg_audio['VBR_scale']); 748 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1)); 749 750 // bytes $9C-$A4 Encoder short VersionString 751 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9); 752 753 // byte $A5 Info Tag revision + VBR method 754 $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1)); 755 756 $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4; 757 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F; 758 $thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']); 759 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr' 760 761 // byte $A6 Lowpass filter value 762 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100; 763 764 // bytes $A7-$AE Replay Gain 765 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html 766 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" 767 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') { 768 // LAME 3.94a16 and later - 9.23 fixed point 769 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375 770 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608); 771 } else { 772 // LAME 3.94a15 and earlier - 32-bit floating point 773 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15 774 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4)); 775 } 776 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) { 777 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); 778 } else { 779 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); 780 } 781 782 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2)); 783 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2)); 784 785 786 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) { 787 788 $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13; 789 $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10; 790 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9; 791 $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF; 792 $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']); 793 $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']); 794 $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']); 795 796 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { 797 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; 798 } 799 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator']; 800 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db']; 801 } else { 802 unset($thisfile_mpeg_audio_lame_RGAD['track']); 803 } 804 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) { 805 806 $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; 807 $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; 808 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; 809 $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; 810 $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']); 811 $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']); 812 $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']); 813 814 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { 815 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; 816 } 817 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator']; 818 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db']; 819 } else { 820 unset($thisfile_mpeg_audio_lame_RGAD['album']); 821 } 822 if (empty($thisfile_mpeg_audio_lame_RGAD)) { 823 unset($thisfile_mpeg_audio_lame['RGAD']); 824 } 825 826 827 // byte $AF Encoding flags + ATH Type 828 $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1)); 829 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10); 830 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20); 831 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40); 832 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80); 833 $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F; 834 835 // byte $B0 if ABR {specified bitrate} else {minimal bitrate} 836 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1)); 837 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR) 838 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; 839 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR) 840 // ignore 841 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate 842 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; 843 } 844 845 // bytes $B1-$B3 Encoder delays 846 $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3)); 847 $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12; 848 $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF; 849 850 // byte $B4 Misc 851 $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1)); 852 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03); 853 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2; 854 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5; 855 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6; 856 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping']; 857 $thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); 858 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality']; 859 $thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']); 860 861 // byte $B5 MP3 Gain 862 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true); 863 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain']; 864 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6)); 865 866 // bytes $B6-$B7 Preset and surround info 867 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2)); 868 // Reserved = ($PresetSurroundBytes & 0xC000); 869 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800); 870 $thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); 871 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); 872 $thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); 873 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { 874 $this->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org'); 875 } 876 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) { 877 // this may change if 3.90.4 ever comes out 878 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3'; 879 } 880 881 // bytes $B8-$BB MusicLength 882 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4)); 883 $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); 884 885 // bytes $BC-$BD MusicCRC 886 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2)); 887 888 // bytes $BE-$BF CRC-16 of Info Tag 889 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2)); 890 891 892 // LAME CBR 893 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { 894 895 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 896 $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); 897 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; 898 //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) { 899 // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min']; 900 //} 901 902 } 903 904 } 905 } 906 907 } else { 908 909 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) 910 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 911 if ($recursivesearch) { 912 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 913 if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) { 914 $recursivesearch = false; 915 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 916 } 917 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { 918 $this->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'); 919 } 920 } 921 922 } 923 924 } 925 926 if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) { 927 if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) { 928 if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) { 929 // ignore, audio data is broken into chunks so will always be data "missing" 930 } 931 elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) { 932 $this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'); 933 } 934 else { 935 $this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)'); 936 } 937 } else { 938 if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) { 939 // $prenullbytefileoffset = $this->ftell(); 940 // $this->fseek($info['avdataend']); 941 // $PossibleNullByte = $this->fread(1); 942 // $this->fseek($prenullbytefileoffset); 943 // if ($PossibleNullByte === "\x00") { 944 $info['avdataend']--; 945 // $this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored'); 946 // } else { 947 // $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'); 948 // } 949 } else { 950 $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'); 951 } 952 } 953 } 954 955 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) { 956 if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { 957 $framebytelength = $this->FreeFormatFrameLength($offset, true); 958 if ($framebytelength > 0) { 959 $thisfile_mpeg_audio['framelength'] = $framebytelength; 960 if ($thisfile_mpeg_audio['layer'] == '1') { 961 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 962 $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; 963 } else { 964 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 965 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; 966 } 967 } else { 968 $this->error('Error calculating frame length of free-format MP3 without Xing/LAME header'); 969 } 970 } 971 } 972 973 if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') { 974 switch ($thisfile_mpeg_audio['bitrate_mode']) { 975 case 'vbr': 976 case 'abr': 977 $bytes_per_frame = 1152; 978 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) { 979 $bytes_per_frame = 384; 980 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) { 981 $bytes_per_frame = 576; 982 } 983 $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0); 984 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { 985 $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; 986 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion 987 } 988 break; 989 } 990 } 991 992 // End variable-bitrate headers 993 //////////////////////////////////////////////////////////////////////////////////// 994 995 if ($recursivesearch) { 996 997 if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) { 998 return false; 999 } 1000 1001 } 1002 1003 1004 //if (false) { 1005 // // experimental side info parsing section - not returning anything useful yet 1006 // 1007 // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData); 1008 // $SideInfoOffset = 0; 1009 // 1010 // if ($thisfile_mpeg_audio['version'] == '1') { 1011 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { 1012 // // MPEG-1 (mono) 1013 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); 1014 // $SideInfoOffset += 9; 1015 // $SideInfoOffset += 5; 1016 // } else { 1017 // // MPEG-1 (stereo, joint-stereo, dual-channel) 1018 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); 1019 // $SideInfoOffset += 9; 1020 // $SideInfoOffset += 3; 1021 // } 1022 // } else { // 2 or 2.5 1023 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { 1024 // // MPEG-2, MPEG-2.5 (mono) 1025 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); 1026 // $SideInfoOffset += 8; 1027 // $SideInfoOffset += 1; 1028 // } else { 1029 // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel) 1030 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); 1031 // $SideInfoOffset += 8; 1032 // $SideInfoOffset += 2; 1033 // } 1034 // } 1035 // 1036 // if ($thisfile_mpeg_audio['version'] == '1') { 1037 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { 1038 // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) { 1039 // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1040 // $SideInfoOffset += 2; 1041 // } 1042 // } 1043 // } 1044 // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) { 1045 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { 1046 // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12); 1047 // $SideInfoOffset += 12; 1048 // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); 1049 // $SideInfoOffset += 9; 1050 // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8); 1051 // $SideInfoOffset += 8; 1052 // if ($thisfile_mpeg_audio['version'] == '1') { 1053 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); 1054 // $SideInfoOffset += 4; 1055 // } else { 1056 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); 1057 // $SideInfoOffset += 9; 1058 // } 1059 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1060 // $SideInfoOffset += 1; 1061 // 1062 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') { 1063 // 1064 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2); 1065 // $SideInfoOffset += 2; 1066 // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1067 // $SideInfoOffset += 1; 1068 // 1069 // for ($region = 0; $region < 2; $region++) { 1070 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); 1071 // $SideInfoOffset += 5; 1072 // } 1073 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0; 1074 // 1075 // for ($window = 0; $window < 3; $window++) { 1076 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3); 1077 // $SideInfoOffset += 3; 1078 // } 1079 // 1080 // } else { 1081 // 1082 // for ($region = 0; $region < 3; $region++) { 1083 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); 1084 // $SideInfoOffset += 5; 1085 // } 1086 // 1087 // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); 1088 // $SideInfoOffset += 4; 1089 // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3); 1090 // $SideInfoOffset += 3; 1091 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0; 1092 // } 1093 // 1094 // if ($thisfile_mpeg_audio['version'] == '1') { 1095 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1096 // $SideInfoOffset += 1; 1097 // } 1098 // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1099 // $SideInfoOffset += 1; 1100 // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1101 // $SideInfoOffset += 1; 1102 // } 1103 // } 1104 //} 1105 1106 return true; 1107 } 1108 1109 /** 1110 * @param int $offset 1111 * @param int $nextframetestoffset 1112 * @param bool $ScanAsCBR 1113 * 1114 * @return bool 1115 */ 1116 public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) { 1117 $info = &$this->getid3->info; 1118 $firstframetestarray = array('error' => array(), 'warning'=> array(), 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']); 1119 $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false); 1120 1121 for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) { 1122 // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch 1123 if (($nextframetestoffset + 4) >= $info['avdataend']) { 1124 // end of file 1125 return true; 1126 } 1127 1128 $nextframetestarray = array('error' => array(), 'warning' => array(), 'avdataend' => $info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); 1129 if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) { 1130 if ($ScanAsCBR) { 1131 // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header 1132 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) { 1133 return false; 1134 } 1135 } 1136 1137 1138 // next frame is OK, get ready to check the one after that 1139 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) { 1140 $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength']; 1141 } else { 1142 $this->error('Frame at offset ('.$offset.') is has an invalid frame length.'); 1143 return false; 1144 } 1145 1146 } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) { 1147 1148 // it's not the end of the file, but there's not enough data left for another frame, so assume it's garbage/padding and return OK 1149 return true; 1150 1151 } else { 1152 1153 // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence 1154 $this->warning('Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.'); 1155 1156 return false; 1157 } 1158 } 1159 return true; 1160 } 1161 1162 /** 1163 * @param int $offset 1164 * @param bool $deepscan 1165 * 1166 * @return int|false 1167 */ 1168 public function FreeFormatFrameLength($offset, $deepscan=false) { 1169 $info = &$this->getid3->info; 1170 1171 $this->fseek($offset); 1172 $MPEGaudioData = $this->fread(32768); 1173 1174 $SyncPattern1 = substr($MPEGaudioData, 0, 4); 1175 // may be different pattern due to padding 1176 $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) | 0x02).$SyncPattern1[3]; 1177 if ($SyncPattern2 === $SyncPattern1) { 1178 $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) & 0xFD).$SyncPattern1[3]; 1179 } 1180 1181 $framelength = false; 1182 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4); 1183 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4); 1184 if ($framelength1 > 4) { 1185 $framelength = $framelength1; 1186 } 1187 if (($framelength2 > 4) && ($framelength2 < $framelength1)) { 1188 $framelength = $framelength2; 1189 } 1190 if (!$framelength) { 1191 1192 // LAME 3.88 has a different value for modeextension on the first frame vs the rest 1193 $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4); 1194 $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4); 1195 1196 if ($framelength1 > 4) { 1197 $framelength = $framelength1; 1198 } 1199 if (($framelength2 > 4) && ($framelength2 < $framelength1)) { 1200 $framelength = $framelength2; 1201 } 1202 if (!$framelength) { 1203 $this->error('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset); 1204 return false; 1205 } else { 1206 $this->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'); 1207 $info['audio']['codec'] = 'LAME'; 1208 $info['audio']['encoder'] = 'LAME3.88'; 1209 $SyncPattern1 = substr($SyncPattern1, 0, 3); 1210 $SyncPattern2 = substr($SyncPattern2, 0, 3); 1211 } 1212 } 1213 1214 if ($deepscan) { 1215 1216 $ActualFrameLengthValues = array(); 1217 $nextoffset = $offset + $framelength; 1218 while ($nextoffset < ($info['avdataend'] - 6)) { 1219 $this->fseek($nextoffset - 1); 1220 $NextSyncPattern = $this->fread(6); 1221 if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) { 1222 // good - found where expected 1223 $ActualFrameLengthValues[] = $framelength; 1224 } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) { 1225 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was) 1226 $ActualFrameLengthValues[] = ($framelength - 1); 1227 $nextoffset--; 1228 } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) { 1229 // ok - found one byte later than expected (last frame was padded, first frame wasn't) 1230 $ActualFrameLengthValues[] = ($framelength + 1); 1231 $nextoffset++; 1232 } else { 1233 $this->error('Did not find expected free-format sync pattern at offset '.$nextoffset); 1234 return false; 1235 } 1236 $nextoffset += $framelength; 1237 } 1238 if (count($ActualFrameLengthValues) > 0) { 1239 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues))); 1240 } 1241 } 1242 return $framelength; 1243 } 1244 1245 /** 1246 * @return bool 1247 */ 1248 public function getOnlyMPEGaudioInfoBruteForce() { 1249 $MPEGaudioHeaderDecodeCache = array(); 1250 $MPEGaudioHeaderValidCache = array(); 1251 $MPEGaudioHeaderLengthCache = array(); 1252 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); 1253 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); 1254 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); 1255 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); 1256 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); 1257 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); 1258 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); 1259 $LongMPEGversionLookup = array(); 1260 $LongMPEGlayerLookup = array(); 1261 $LongMPEGbitrateLookup = array(); 1262 $LongMPEGpaddingLookup = array(); 1263 $LongMPEGfrequencyLookup = array(); 1264 $Distribution['bitrate'] = array(); 1265 $Distribution['frequency'] = array(); 1266 $Distribution['layer'] = array(); 1267 $Distribution['version'] = array(); 1268 $Distribution['padding'] = array(); 1269 1270 $info = &$this->getid3->info; 1271 $this->fseek($info['avdataoffset']); 1272 1273 $max_frames_scan = 5000; 1274 $frames_scanned = 0; 1275 1276 $previousvalidframe = $info['avdataoffset']; 1277 while ($this->ftell() < $info['avdataend']) { 1278 set_time_limit(30); 1279 $head4 = $this->fread(4); 1280 if (strlen($head4) < 4) { 1281 break; 1282 } 1283 if ($head4[0] != "\xFF") { 1284 for ($i = 1; $i < 4; $i++) { 1285 if ($head4[$i] == "\xFF") { 1286 $this->fseek($i - 4, SEEK_CUR); 1287 continue 2; 1288 } 1289 } 1290 continue; 1291 } 1292 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) { 1293 $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4); 1294 } 1295 if (!isset($MPEGaudioHeaderValidCache[$head4])) { 1296 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false); 1297 } 1298 if ($MPEGaudioHeaderValidCache[$head4]) { 1299 1300 if (!isset($MPEGaudioHeaderLengthCache[$head4])) { 1301 $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']]; 1302 $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']]; 1303 $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']]; 1304 $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding']; 1305 $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']]; 1306 $MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength( 1307 $LongMPEGbitrateLookup[$head4], 1308 $LongMPEGversionLookup[$head4], 1309 $LongMPEGlayerLookup[$head4], 1310 $LongMPEGpaddingLookup[$head4], 1311 $LongMPEGfrequencyLookup[$head4]); 1312 } 1313 if ($MPEGaudioHeaderLengthCache[$head4] > 4) { 1314 $WhereWeWere = $this->ftell(); 1315 $this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR); 1316 $next4 = $this->fread(4); 1317 if ($next4[0] == "\xFF") { 1318 if (!isset($MPEGaudioHeaderDecodeCache[$next4])) { 1319 $MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4); 1320 } 1321 if (!isset($MPEGaudioHeaderValidCache[$next4])) { 1322 $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false); 1323 } 1324 if ($MPEGaudioHeaderValidCache[$next4]) { 1325 $this->fseek(-4, SEEK_CUR); 1326 1327 getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]); 1328 getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]); 1329 getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]); 1330 getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]); 1331 getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]); 1332 if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) { 1333 $pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']); 1334 $this->warning('too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.'); 1335 foreach ($Distribution as $key1 => $value1) { 1336 foreach ($value1 as $key2 => $value2) { 1337 $Distribution[$key1][$key2] = round($value2 / $pct_data_scanned); 1338 } 1339 } 1340 break; 1341 } 1342 continue; 1343 } 1344 } 1345 unset($next4); 1346 $this->fseek($WhereWeWere - 3); 1347 } 1348 1349 } 1350 } 1351 foreach ($Distribution as $key => $value) { 1352 ksort($Distribution[$key], SORT_NUMERIC); 1353 } 1354 ksort($Distribution['version'], SORT_STRING); 1355 $info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate']; 1356 $info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency']; 1357 $info['mpeg']['audio']['layer_distribution'] = $Distribution['layer']; 1358 $info['mpeg']['audio']['version_distribution'] = $Distribution['version']; 1359 $info['mpeg']['audio']['padding_distribution'] = $Distribution['padding']; 1360 if (count($Distribution['version']) > 1) { 1361 $this->error('Corrupt file - more than one MPEG version detected'); 1362 } 1363 if (count($Distribution['layer']) > 1) { 1364 $this->error('Corrupt file - more than one MPEG layer detected'); 1365 } 1366 if (count($Distribution['frequency']) > 1) { 1367 $this->error('Corrupt file - more than one MPEG sample rate detected'); 1368 } 1369 1370 1371 $bittotal = 0; 1372 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) { 1373 if ($bitratevalue != 'free') { 1374 $bittotal += ($bitratevalue * $bitratecount); 1375 } 1376 } 1377 $info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']); 1378 if ($info['mpeg']['audio']['frame_count'] == 0) { 1379 $this->error('no MPEG audio frames found'); 1380 return false; 1381 } 1382 $info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']); 1383 $info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr'); 1384 $info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true); 1385 1386 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; 1387 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; 1388 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; 1389 $info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true); 1390 $info['fileformat'] = $info['audio']['dataformat']; 1391 1392 return true; 1393 } 1394 1395 /** 1396 * @param int $avdataoffset 1397 * @param bool $BitrateHistogram 1398 * 1399 * @return bool 1400 */ 1401 public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) { 1402 // looks for synch, decodes MPEG audio header 1403 1404 $info = &$this->getid3->info; 1405 1406 static $MPEGaudioVersionLookup; 1407 static $MPEGaudioLayerLookup; 1408 static $MPEGaudioBitrateLookup; 1409 if (empty($MPEGaudioVersionLookup)) { 1410 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); 1411 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); 1412 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); 1413 } 1414 1415 $this->fseek($avdataoffset); 1416 $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset); 1417 if ($sync_seek_buffer_size <= 0) { 1418 $this->error('Invalid $sync_seek_buffer_size at offset '.$avdataoffset); 1419 return false; 1420 } 1421 $header = $this->fread($sync_seek_buffer_size); 1422 $sync_seek_buffer_size = strlen($header); 1423 $SynchSeekOffset = 0; 1424 while ($SynchSeekOffset < $sync_seek_buffer_size) { 1425 if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) { 1426 1427 if ($SynchSeekOffset > $sync_seek_buffer_size) { 1428 // if a synch's not found within the first 128k bytes, then give up 1429 $this->error('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB'); 1430 if (isset($info['audio']['bitrate'])) { 1431 unset($info['audio']['bitrate']); 1432 } 1433 if (isset($info['mpeg']['audio'])) { 1434 unset($info['mpeg']['audio']); 1435 } 1436 if (empty($info['mpeg'])) { 1437 unset($info['mpeg']); 1438 } 1439 return false; 1440 1441 } elseif (feof($this->getid3->fp)) { 1442 1443 $this->error('Could not find valid MPEG audio synch before end of file'); 1444 if (isset($info['audio']['bitrate'])) { 1445 unset($info['audio']['bitrate']); 1446 } 1447 if (isset($info['mpeg']['audio'])) { 1448 unset($info['mpeg']['audio']); 1449 } 1450 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) { 1451 unset($info['mpeg']); 1452 } 1453 return false; 1454 } 1455 } 1456 1457 if (($SynchSeekOffset + 1) >= strlen($header)) { 1458 $this->error('Could not find valid MPEG synch before end of file'); 1459 return false; 1460 } 1461 1462 if (($header[$SynchSeekOffset] == "\xFF") && ($header[($SynchSeekOffset + 1)] > "\xE0")) { // synch detected 1463 $FirstFrameAVDataOffset = null; 1464 if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) { 1465 $FirstFrameThisfileInfo = $info; 1466 $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset; 1467 if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) { 1468 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's 1469 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below 1470 unset($FirstFrameThisfileInfo); 1471 } 1472 } 1473 1474 $dummy = $info; // only overwrite real data if valid header found 1475 if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) { 1476 $info = $dummy; 1477 $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset; 1478 switch (isset($info['fileformat']) ? $info['fileformat'] : '') { 1479 case '': 1480 case 'id3': 1481 case 'ape': 1482 case 'mp3': 1483 $info['fileformat'] = 'mp3'; 1484 $info['audio']['dataformat'] = 'mp3'; 1485 break; 1486 } 1487 if (isset($FirstFrameThisfileInfo) && isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) { 1488 if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) { 1489 // If there is garbage data between a valid VBR header frame and a sequence 1490 // of valid MPEG-audio frames the VBR data is no longer discarded. 1491 $info = $FirstFrameThisfileInfo; 1492 $info['avdataoffset'] = $FirstFrameAVDataOffset; 1493 $info['fileformat'] = 'mp3'; 1494 $info['audio']['dataformat'] = 'mp3'; 1495 $dummy = $info; 1496 unset($dummy['mpeg']['audio']); 1497 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength']; 1498 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset; 1499 if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) { 1500 $info = $dummy; 1501 $info['avdataoffset'] = $GarbageOffsetEnd; 1502 $this->warning('apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd); 1503 } else { 1504 $this->warning('using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')'); 1505 } 1506 } 1507 } 1508 if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) { 1509 // VBR file with no VBR header 1510 $BitrateHistogram = true; 1511 } 1512 1513 if ($BitrateHistogram) { 1514 1515 $info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0); 1516 $info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0); 1517 1518 if ($info['mpeg']['audio']['version'] == '1') { 1519 if ($info['mpeg']['audio']['layer'] == 3) { 1520 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0); 1521 } elseif ($info['mpeg']['audio']['layer'] == 2) { 1522 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0); 1523 } elseif ($info['mpeg']['audio']['layer'] == 1) { 1524 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0); 1525 } 1526 } elseif ($info['mpeg']['audio']['layer'] == 1) { 1527 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0); 1528 } else { 1529 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0); 1530 } 1531 1532 $dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); 1533 $synchstartoffset = $info['avdataoffset']; 1534 $this->fseek($info['avdataoffset']); 1535 1536 // you can play with these numbers: 1537 $max_frames_scan = 50000; 1538 $max_scan_segments = 10; 1539 1540 // don't play with these numbers: 1541 $FastMode = false; 1542 $SynchErrorsFound = 0; 1543 $frames_scanned = 0; 1544 $this_scan_segment = 0; 1545 $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments); 1546 $pct_data_scanned = 0; 1547 for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) { 1548 $frames_scanned_this_segment = 0; 1549 if ($this->ftell() >= $info['avdataend']) { 1550 break; 1551 } 1552 $scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments))); 1553 if ($current_segment > 0) { 1554 $this->fseek($scan_start_offset[$current_segment]); 1555 $buffer_4k = $this->fread(4096); 1556 for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) { 1557 if (($buffer_4k[$j] == "\xFF") && ($buffer_4k[($j + 1)] > "\xE0")) { // synch detected 1558 if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) { 1559 $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength']; 1560 if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) { 1561 $scan_start_offset[$current_segment] += $j; 1562 break; 1563 } 1564 } 1565 } 1566 } 1567 } 1568 $synchstartoffset = $scan_start_offset[$current_segment]; 1569 while (($synchstartoffset < $info['avdataend']) && $this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) { 1570 $FastMode = true; 1571 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']]; 1572 1573 if (empty($dummy['mpeg']['audio']['framelength'])) { 1574 $SynchErrorsFound++; 1575 $synchstartoffset++; 1576 } else { 1577 getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]); 1578 getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]); 1579 getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]); 1580 $synchstartoffset += $dummy['mpeg']['audio']['framelength']; 1581 } 1582 $frames_scanned++; 1583 if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) { 1584 $this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']); 1585 if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) { 1586 // file likely contains < $max_frames_scan, just scan as one segment 1587 $max_scan_segments = 1; 1588 $frames_scan_per_segment = $max_frames_scan; 1589 } else { 1590 $pct_data_scanned += $this_pct_scanned; 1591 break; 1592 } 1593 } 1594 } 1595 } 1596 if ($pct_data_scanned > 0) { 1597 $this->warning('too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.'); 1598 foreach ($info['mpeg']['audio'] as $key1 => $value1) { 1599 if (!preg_match('#_distribution$#i', $key1)) { 1600 continue; 1601 } 1602 foreach ($value1 as $key2 => $value2) { 1603 $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned); 1604 } 1605 } 1606 } 1607 1608 if ($SynchErrorsFound > 0) { 1609 $this->warning('Found '.$SynchErrorsFound.' synch errors in histogram analysis'); 1610 //return false; 1611 } 1612 1613 $bittotal = 0; 1614 $framecounter = 0; 1615 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) { 1616 $framecounter += $bitratecount; 1617 if ($bitratevalue != 'free') { 1618 $bittotal += ($bitratevalue * $bitratecount); 1619 } 1620 } 1621 if ($framecounter == 0) { 1622 $this->error('Corrupt MP3 file: framecounter == zero'); 1623 return false; 1624 } 1625 $info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter); 1626 $info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter); 1627 1628 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; 1629 1630 1631 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently 1632 $distinct_bitrates = 0; 1633 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) { 1634 if ($bitrate_count > 0) { 1635 $distinct_bitrates++; 1636 } 1637 } 1638 if ($distinct_bitrates > 1) { 1639 $info['mpeg']['audio']['bitrate_mode'] = 'vbr'; 1640 } else { 1641 $info['mpeg']['audio']['bitrate_mode'] = 'cbr'; 1642 } 1643 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; 1644 1645 } 1646 1647 break; // exit while() 1648 } 1649 } 1650 1651 $SynchSeekOffset++; 1652 if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) { 1653 // end of file/data 1654 1655 if (empty($info['mpeg']['audio'])) { 1656 1657 $this->error('could not find valid MPEG synch before end of file'); 1658 if (isset($info['audio']['bitrate'])) { 1659 unset($info['audio']['bitrate']); 1660 } 1661 if (isset($info['mpeg']['audio'])) { 1662 unset($info['mpeg']['audio']); 1663 } 1664 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) { 1665 unset($info['mpeg']); 1666 } 1667 return false; 1668 1669 } 1670 break; 1671 } 1672 1673 } 1674 $info['audio']['channels'] = $info['mpeg']['audio']['channels']; 1675 $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode']; 1676 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; 1677 return true; 1678 } 1679 1680 /** 1681 * @return array 1682 */ 1683 public static function MPEGaudioVersionArray() { 1684 static $MPEGaudioVersion = array('2.5', false, '2', '1'); 1685 return $MPEGaudioVersion; 1686 } 1687 1688 /** 1689 * @return array 1690 */ 1691 public static function MPEGaudioLayerArray() { 1692 static $MPEGaudioLayer = array(false, 3, 2, 1); 1693 return $MPEGaudioLayer; 1694 } 1695 1696 /** 1697 * @return array 1698 */ 1699 public static function MPEGaudioBitrateArray() { 1700 static $MPEGaudioBitrate; 1701 if (empty($MPEGaudioBitrate)) { 1702 $MPEGaudioBitrate = array ( 1703 '1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000), 1704 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000), 1705 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000) 1706 ), 1707 1708 '2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000), 1709 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000), 1710 ) 1711 ); 1712 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2]; 1713 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2']; 1714 } 1715 return $MPEGaudioBitrate; 1716 } 1717 1718 /** 1719 * @return array 1720 */ 1721 public static function MPEGaudioFrequencyArray() { 1722 static $MPEGaudioFrequency; 1723 if (empty($MPEGaudioFrequency)) { 1724 $MPEGaudioFrequency = array ( 1725 '1' => array(44100, 48000, 32000), 1726 '2' => array(22050, 24000, 16000), 1727 '2.5' => array(11025, 12000, 8000) 1728 ); 1729 } 1730 return $MPEGaudioFrequency; 1731 } 1732 1733 /** 1734 * @return array 1735 */ 1736 public static function MPEGaudioChannelModeArray() { 1737 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono'); 1738 return $MPEGaudioChannelMode; 1739 } 1740 1741 /** 1742 * @return array 1743 */ 1744 public static function MPEGaudioModeExtensionArray() { 1745 static $MPEGaudioModeExtension; 1746 if (empty($MPEGaudioModeExtension)) { 1747 $MPEGaudioModeExtension = array ( 1748 1 => array('4-31', '8-31', '12-31', '16-31'), 1749 2 => array('4-31', '8-31', '12-31', '16-31'), 1750 3 => array('', 'IS', 'MS', 'IS+MS') 1751 ); 1752 } 1753 return $MPEGaudioModeExtension; 1754 } 1755 1756 /** 1757 * @return array 1758 */ 1759 public static function MPEGaudioEmphasisArray() { 1760 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17'); 1761 return $MPEGaudioEmphasis; 1762 } 1763 1764 /** 1765 * @param string $head4 1766 * @param bool $allowBitrate15 1767 * 1768 * @return bool 1769 */ 1770 public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) { 1771 return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15); 1772 } 1773 1774 /** 1775 * @param array $rawarray 1776 * @param bool $echoerrors 1777 * @param bool $allowBitrate15 1778 * 1779 * @return bool 1780 */ 1781 public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) { 1782 if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) { 1783 return false; 1784 } 1785 1786 static $MPEGaudioVersionLookup; 1787 static $MPEGaudioLayerLookup; 1788 static $MPEGaudioBitrateLookup; 1789 static $MPEGaudioFrequencyLookup; 1790 static $MPEGaudioChannelModeLookup; 1791 static $MPEGaudioModeExtensionLookup; 1792 static $MPEGaudioEmphasisLookup; 1793 if (empty($MPEGaudioVersionLookup)) { 1794 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); 1795 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); 1796 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); 1797 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); 1798 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); 1799 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); 1800 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); 1801 } 1802 1803 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) { 1804 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']]; 1805 } else { 1806 echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : ''); 1807 return false; 1808 } 1809 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) { 1810 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']]; 1811 } else { 1812 echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : ''); 1813 return false; 1814 } 1815 if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) { 1816 echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : ''); 1817 if ($rawarray['bitrate'] == 15) { 1818 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0 1819 // let it go through here otherwise file will not be identified 1820 if (!$allowBitrate15) { 1821 return false; 1822 } 1823 } else { 1824 return false; 1825 } 1826 } 1827 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) { 1828 echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : ''); 1829 return false; 1830 } 1831 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) { 1832 echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : ''); 1833 return false; 1834 } 1835 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) { 1836 echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : ''); 1837 return false; 1838 } 1839 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) { 1840 echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : ''); 1841 return false; 1842 } 1843 // These are just either set or not set, you can't mess that up :) 1844 // $rawarray['protection']; 1845 // $rawarray['padding']; 1846 // $rawarray['private']; 1847 // $rawarray['copyright']; 1848 // $rawarray['original']; 1849 1850 return true; 1851 } 1852 1853 /** 1854 * @param string $Header4Bytes 1855 * 1856 * @return array|false 1857 */ 1858 public static function MPEGaudioHeaderDecode($Header4Bytes) { 1859 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM 1860 // A - Frame sync (all bits set) 1861 // B - MPEG Audio version ID 1862 // C - Layer description 1863 // D - Protection bit 1864 // E - Bitrate index 1865 // F - Sampling rate frequency index 1866 // G - Padding bit 1867 // H - Private bit 1868 // I - Channel Mode 1869 // J - Mode extension (Only if Joint stereo) 1870 // K - Copyright 1871 // L - Original 1872 // M - Emphasis 1873 1874 if (strlen($Header4Bytes) != 4) { 1875 return false; 1876 } 1877 1878 $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4; 1879 $MPEGrawHeader['version'] = (ord($Header4Bytes[1]) & 0x18) >> 3; // BB 1880 $MPEGrawHeader['layer'] = (ord($Header4Bytes[1]) & 0x06) >> 1; // CC 1881 $MPEGrawHeader['protection'] = (ord($Header4Bytes[1]) & 0x01); // D 1882 $MPEGrawHeader['bitrate'] = (ord($Header4Bytes[2]) & 0xF0) >> 4; // EEEE 1883 $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes[2]) & 0x0C) >> 2; // FF 1884 $MPEGrawHeader['padding'] = (ord($Header4Bytes[2]) & 0x02) >> 1; // G 1885 $MPEGrawHeader['private'] = (ord($Header4Bytes[2]) & 0x01); // H 1886 $MPEGrawHeader['channelmode'] = (ord($Header4Bytes[3]) & 0xC0) >> 6; // II 1887 $MPEGrawHeader['modeextension'] = (ord($Header4Bytes[3]) & 0x30) >> 4; // JJ 1888 $MPEGrawHeader['copyright'] = (ord($Header4Bytes[3]) & 0x08) >> 3; // K 1889 $MPEGrawHeader['original'] = (ord($Header4Bytes[3]) & 0x04) >> 2; // L 1890 $MPEGrawHeader['emphasis'] = (ord($Header4Bytes[3]) & 0x03); // MM 1891 1892 return $MPEGrawHeader; 1893 } 1894 1895 /** 1896 * @param int|string $bitrate 1897 * @param string $version 1898 * @param string $layer 1899 * @param bool $padding 1900 * @param int $samplerate 1901 * 1902 * @return int|false 1903 */ 1904 public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) { 1905 static $AudioFrameLengthCache = array(); 1906 1907 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) { 1908 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false; 1909 if ($bitrate != 'free') { 1910 1911 if ($version == '1') { 1912 1913 if ($layer == '1') { 1914 1915 // For Layer I slot is 32 bits long 1916 $FrameLengthCoefficient = 48; 1917 $SlotLength = 4; 1918 1919 } else { // Layer 2 / 3 1920 1921 // for Layer 2 and Layer 3 slot is 8 bits long. 1922 $FrameLengthCoefficient = 144; 1923 $SlotLength = 1; 1924 1925 } 1926 1927 } else { // MPEG-2 / MPEG-2.5 1928 1929 if ($layer == '1') { 1930 1931 // For Layer I slot is 32 bits long 1932 $FrameLengthCoefficient = 24; 1933 $SlotLength = 4; 1934 1935 } elseif ($layer == '2') { 1936 1937 // for Layer 2 and Layer 3 slot is 8 bits long. 1938 $FrameLengthCoefficient = 144; 1939 $SlotLength = 1; 1940 1941 } else { // layer 3 1942 1943 // for Layer 2 and Layer 3 slot is 8 bits long. 1944 $FrameLengthCoefficient = 72; 1945 $SlotLength = 1; 1946 1947 } 1948 1949 } 1950 1951 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding 1952 if ($samplerate > 0) { 1953 $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate; 1954 $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I) 1955 if ($padding) { 1956 $NewFramelength += $SlotLength; 1957 } 1958 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength; 1959 } 1960 } 1961 } 1962 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate]; 1963 } 1964 1965 /** 1966 * @param float|int $bit_rate 1967 * 1968 * @return int|float|string 1969 */ 1970 public static function ClosestStandardMP3Bitrate($bit_rate) { 1971 static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000); 1972 static $bit_rate_table = array (0=>'-'); 1973 $round_bit_rate = intval(round($bit_rate, -3)); 1974 if (!isset($bit_rate_table[$round_bit_rate])) { 1975 if ($round_bit_rate > max($standard_bit_rates)) { 1976 $bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate)); 1977 } else { 1978 $bit_rate_table[$round_bit_rate] = max($standard_bit_rates); 1979 foreach ($standard_bit_rates as $standard_bit_rate) { 1980 if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) { 1981 break; 1982 } 1983 $bit_rate_table[$round_bit_rate] = $standard_bit_rate; 1984 } 1985 } 1986 } 1987 return $bit_rate_table[$round_bit_rate]; 1988 } 1989 1990 /** 1991 * @param string $version 1992 * @param string $channelmode 1993 * 1994 * @return int 1995 */ 1996 public static function XingVBRidOffset($version, $channelmode) { 1997 static $XingVBRidOffsetCache = array(); 1998 if (empty($XingVBRidOffsetCache)) { 1999 $XingVBRidOffsetCache = array ( 2000 '1' => array ('mono' => 0x15, // 4 + 17 = 21 2001 'stereo' => 0x24, // 4 + 32 = 36 2002 'joint stereo' => 0x24, 2003 'dual channel' => 0x24 2004 ), 2005 2006 '2' => array ('mono' => 0x0D, // 4 + 9 = 13 2007 'stereo' => 0x15, // 4 + 17 = 21 2008 'joint stereo' => 0x15, 2009 'dual channel' => 0x15 2010 ), 2011 2012 '2.5' => array ('mono' => 0x15, 2013 'stereo' => 0x15, 2014 'joint stereo' => 0x15, 2015 'dual channel' => 0x15 2016 ) 2017 ); 2018 } 2019 return $XingVBRidOffsetCache[$version][$channelmode]; 2020 } 2021 2022 /** 2023 * @param int $VBRmethodID 2024 * 2025 * @return string 2026 */ 2027 public static function LAMEvbrMethodLookup($VBRmethodID) { 2028 static $LAMEvbrMethodLookup = array( 2029 0x00 => 'unknown', 2030 0x01 => 'cbr', 2031 0x02 => 'abr', 2032 0x03 => 'vbr-old / vbr-rh', 2033 0x04 => 'vbr-new / vbr-mtrh', 2034 0x05 => 'vbr-mt', 2035 0x06 => 'vbr (full vbr method 4)', 2036 0x08 => 'cbr (constant bitrate 2 pass)', 2037 0x09 => 'abr (2 pass)', 2038 0x0F => 'reserved' 2039 ); 2040 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : ''); 2041 } 2042 2043 /** 2044 * @param int $StereoModeID 2045 * 2046 * @return string 2047 */ 2048 public static function LAMEmiscStereoModeLookup($StereoModeID) { 2049 static $LAMEmiscStereoModeLookup = array( 2050 0 => 'mono', 2051 1 => 'stereo', 2052 2 => 'dual mono', 2053 3 => 'joint stereo', 2054 4 => 'forced stereo', 2055 5 => 'auto', 2056 6 => 'intensity stereo', 2057 7 => 'other' 2058 ); 2059 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : ''); 2060 } 2061 2062 /** 2063 * @param int $SourceSampleFrequencyID 2064 * 2065 * @return string 2066 */ 2067 public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) { 2068 static $LAMEmiscSourceSampleFrequencyLookup = array( 2069 0 => '<= 32 kHz', 2070 1 => '44.1 kHz', 2071 2 => '48 kHz', 2072 3 => '> 48kHz' 2073 ); 2074 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : ''); 2075 } 2076 2077 /** 2078 * @param int $SurroundInfoID 2079 * 2080 * @return string 2081 */ 2082 public static function LAMEsurroundInfoLookup($SurroundInfoID) { 2083 static $LAMEsurroundInfoLookup = array( 2084 0 => 'no surround info', 2085 1 => 'DPL encoding', 2086 2 => 'DPL2 encoding', 2087 3 => 'Ambisonic encoding' 2088 ); 2089 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved'); 2090 } 2091 2092 /** 2093 * @param array $LAMEtag 2094 * 2095 * @return string 2096 */ 2097 public static function LAMEpresetUsedLookup($LAMEtag) { 2098 2099 if ($LAMEtag['preset_used_id'] == 0) { 2100 // no preset used (LAME >=3.93) 2101 // no preset recorded (LAME <3.93) 2102 return ''; 2103 } 2104 $LAMEpresetUsedLookup = array(); 2105 2106 ///// THIS PART CANNOT BE STATIC . 2107 for ($i = 8; $i <= 320; $i++) { 2108 switch ($LAMEtag['vbr_method']) { 2109 case 'cbr': 2110 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i; 2111 break; 2112 case 'abr': 2113 default: // other VBR modes shouldn't be here(?) 2114 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i; 2115 break; 2116 } 2117 } 2118 2119 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions() 2120 2121 // named alt-presets 2122 $LAMEpresetUsedLookup[1000] = '--r3mix'; 2123 $LAMEpresetUsedLookup[1001] = '--alt-preset standard'; 2124 $LAMEpresetUsedLookup[1002] = '--alt-preset extreme'; 2125 $LAMEpresetUsedLookup[1003] = '--alt-preset insane'; 2126 $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard'; 2127 $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme'; 2128 $LAMEpresetUsedLookup[1006] = '--alt-preset medium'; 2129 $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium'; 2130 2131 // LAME 3.94 additions/changes 2132 $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003 2133 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003 2134 2135 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003 2136 $LAMEpresetUsedLookup[410] = '-V9'; 2137 $LAMEpresetUsedLookup[420] = '-V8'; 2138 $LAMEpresetUsedLookup[440] = '-V6'; 2139 $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003 2140 $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003 2141 $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003 2142 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003 2143 $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003 2144 $LAMEpresetUsedLookup[490] = '-V1'; 2145 $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003 2146 2147 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org'); 2148 } 2149 2150 }
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