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