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/wp-includes/ID3/ -> module.audio.mp3.php (source)

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


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