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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  // number of frames to scan to determine if MPEG-audio sequence is valid
  22  // Lower this number to 5-20 for faster scanning
  23  // Increase this number to 50+ for most accurate detection of valid VBR/CBR
  24  // mpeg-audio streams
  25  define('GETID3_MP3_VALID_CHECK_FRAMES', 35);
  26  
  27  
  28  class getid3_mp3 extends getid3_handler
  29  {
  30      /**
  31       * Forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow,
  32       * unrecommended, but may provide data from otherwise-unusable files.
  33       *
  34       * @var bool
  35       */
  36      public $allow_bruteforce = false;
  37  
  38      /**
  39       * @return bool
  40       */
  41  	public function Analyze() {
  42          $info = &$this->getid3->info;
  43  
  44          $initialOffset = $info['avdataoffset'];
  45  
  46          if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
  47              if ($this->allow_bruteforce) {
  48                  $this->error('Rescanning file in BruteForce mode');
  49                  $this->getOnlyMPEGaudioInfoBruteForce();
  50              }
  51          }
  52  
  53  
  54          if (isset($info['mpeg']['audio']['bitrate_mode'])) {
  55              $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
  56          }
  57  
  58          if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
  59  
  60              $synchoffsetwarning = 'Unknown data before synch ';
  61              if (isset($info['id3v2']['headerlength'])) {
  62                  $synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
  63              } elseif ($initialOffset > 0) {
  64                  $synchoffsetwarning .= '(should be at '.$initialOffset.', ';
  65              } else {
  66                  $synchoffsetwarning .= '(should be at beginning of file, ';
  67              }
  68              $synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
  69              if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
  70  
  71                  if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
  72  
  73                      $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
  74                      $info['audio']['codec'] = 'LAME';
  75                      $CurrentDataLAMEversionString = 'LAME3.';
  76  
  77                  } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
  78  
  79                      $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
  80                      $info['audio']['codec'] = 'LAME';
  81                      $CurrentDataLAMEversionString = 'LAME3.';
  82  
  83                  }
  84  
  85              }
  86              $this->warning($synchoffsetwarning);
  87  
  88          }
  89  
  90          if (isset($info['mpeg']['audio']['LAME'])) {
  91              $info['audio']['codec'] = 'LAME';
  92              if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
  93                  $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
  94              } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
  95                  $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
  96              }
  97          }
  98  
  99          $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
 100          if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
 101              // a version number of LAME that does not end with a number like "LAME3.92"
 102              // or with a closing parenthesis like "LAME3.88 (alpha)"
 103              // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
 104  
 105              // not sure what the actual last frame length will be, but will be less than or equal to 1441
 106              $PossiblyLongerLAMEversion_FrameLength = 1441;
 107  
 108              // Not sure what version of LAME this is - look in padding of last frame for longer version string
 109              $PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
 110              $this->fseek($PossibleLAMEversionStringOffset);
 111              $PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength);
 112              switch (substr($CurrentDataLAMEversionString, -1)) {
 113                  case 'a':
 114                  case 'b':
 115                      // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
 116                      // need to trim off "a" to match longer string
 117                      $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
 118                      break;
 119              }
 120              if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
 121                  if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
 122                      $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3"  "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
 123                      if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
 124                          $info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
 125                      }
 126                  }
 127              }
 128          }
 129          if (!empty($info['audio']['encoder'])) {
 130              $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
 131          }
 132  
 133          switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
 134              case 1:
 135              case 2:
 136                  $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
 137                  break;
 138          }
 139          if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
 140              switch ($info['audio']['dataformat']) {
 141                  case 'mp1':
 142                  case 'mp2':
 143                  case 'mp3':
 144                      $info['fileformat'] = $info['audio']['dataformat'];
 145                      break;
 146  
 147                  default:
 148                      $this->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"');
 149                      break;
 150              }
 151          }
 152  
 153          if (empty($info['fileformat'])) {
 154              unset($info['fileformat']);
 155              unset($info['audio']['bitrate_mode']);
 156              unset($info['avdataoffset']);
 157              unset($info['avdataend']);
 158              return false;
 159          }
 160  
 161          $info['mime_type']         = 'audio/mpeg';
 162          $info['audio']['lossless'] = false;
 163  
 164          // Calculate playtime
 165          if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
 166              // https://github.com/JamesHeinrich/getID3/issues/161
 167              // VBR header frame contains ~0.026s of silent audio data, but is not actually part of the original encoding and should be ignored
 168              $xingVBRheaderFrameLength = ((isset($info['mpeg']['audio']['VBR_frames']) && isset($info['mpeg']['audio']['framelength'])) ? $info['mpeg']['audio']['framelength'] : 0);
 169  
 170              $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset'] - $xingVBRheaderFrameLength) * 8 / $info['audio']['bitrate'];
 171          }
 172  
 173          $info['audio']['encoder_options'] = $this->GuessEncoderOptions();
 174  
 175          return true;
 176      }
 177  
 178      /**
 179       * @return string
 180       */
 181  	public function GuessEncoderOptions() {
 182          // shortcuts
 183          $info = &$this->getid3->info;
 184          $thisfile_mpeg_audio = array();
 185          $thisfile_mpeg_audio_lame = array();
 186          if (!empty($info['mpeg']['audio'])) {
 187              $thisfile_mpeg_audio = &$info['mpeg']['audio'];
 188              if (!empty($thisfile_mpeg_audio['LAME'])) {
 189                  $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
 190              }
 191          }
 192  
 193          $encoder_options = '';
 194          static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
 195  
 196          if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
 197  
 198              $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
 199  
 200          } 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))) {
 201  
 202              $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
 203  
 204          } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
 205  
 206              static $KnownEncoderValues = array();
 207              if (empty($KnownEncoderValues)) {
 208  
 209                  //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
 210                  $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane';        // 3.90,   3.90.1, 3.92
 211                  $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane';        // 3.90.2, 3.90.3, 3.91
 212                  $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane';        // 3.94,   3.95
 213                  $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme';       // 3.90,   3.90.1, 3.92
 214                  $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme';       // 3.90.2, 3.91
 215                  $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme';       // 3.90.3
 216                  $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme';  // 3.90,   3.90.1, 3.92
 217                  $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme';  // 3.90.2, 3.90.3, 3.91
 218                  $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard';      // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
 219                  $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard';      // 3.90.3
 220                  $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
 221                  $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
 222                  $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix';                    // 3.90,   3.90.1, 3.92
 223                  $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix';                    // 3.90.2, 3.90.3, 3.91
 224                  $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix';                    // 3.94,   3.95
 225                  $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium';        // 3.90.3
 226                  $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium';   // 3.90.3
 227  
 228                  $KnownEncoderValues[0xFF][99][1][1][1][2][0]     = '--preset studio';            // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
 229                  $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio';            // 3.90.3, 3.93.1
 230                  $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio';            // 3.93
 231                  $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio';            // 3.94,   3.95
 232                  $KnownEncoderValues[0xC0][88][1][1][1][2][0]     = '--preset cd';                // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
 233                  $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd';                // 3.90.3, 3.93.1
 234                  $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd';                // 3.93
 235                  $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd';                // 3.94,   3.95
 236                  $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi';              // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
 237                  $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi';              // 3.90.3, 3.93,   3.93.1
 238                  $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi';              // 3.94,   3.95
 239                  $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape';              // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
 240                  $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio';             // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
 241                  $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm';                // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
 242                  $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm';     // 3.90.3, 3.93,   3.93.1
 243                  $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm';     // 3.94,   3.95
 244                  $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice';             // 3.90.3, 3.93,   3.93.1
 245                  $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice';             // 3.94,   3.95
 246                  $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice';             // 3.94a14
 247                  $KnownEncoderValues[0x28][65][1][1][0][2][7500]  = '--preset mw-us';             // 3.90,   3.90.1, 3.92
 248                  $KnownEncoderValues[0x28][65][1][1][0][2][7600]  = '--preset mw-us';             // 3.90.2, 3.91
 249                  $KnownEncoderValues[0x28][58][2][2][0][2][7000]  = '--preset mw-us';             // 3.90.3, 3.93,   3.93.1
 250                  $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us';             // 3.94,   3.95
 251                  $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us';             // 3.94a14
 252                  $KnownEncoderValues[0x28][57][2][1][0][4][8800]  = '--preset mw-us';             // 3.94a15
 253                  $KnownEncoderValues[0x18][58][2][2][0][2][4000]  = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
 254                  $KnownEncoderValues[0x18][58][2][2][0][2][3900]  = '--preset phon+/lw/mw-eu/sw'; // 3.93
 255                  $KnownEncoderValues[0x18][57][2][1][0][4][5900]  = '--preset phon+/lw/mw-eu/sw'; // 3.94,   3.95
 256                  $KnownEncoderValues[0x18][57][2][1][0][4][6200]  = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
 257                  $KnownEncoderValues[0x18][57][2][1][0][4][3200]  = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
 258                  $KnownEncoderValues[0x10][58][2][2][0][2][3800]  = '--preset phone';             // 3.90.3, 3.93.1
 259                  $KnownEncoderValues[0x10][58][2][2][0][2][3700]  = '--preset phone';             // 3.93
 260                  $KnownEncoderValues[0x10][57][2][1][0][4][5600]  = '--preset phone';             // 3.94,   3.95
 261              }
 262  
 263              if (isset($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']])) {
 264  
 265                  $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']];
 266  
 267              } 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']])) {
 268  
 269                  $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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
 270  
 271              } elseif ($info['audio']['bitrate_mode'] == 'vbr') {
 272  
 273                  // http://gabriel.mp3-tech.org/mp3infotag.html
 274                  // int    Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
 275  
 276  
 277                  $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
 278                  $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
 279                  $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value;
 280  
 281              } elseif ($info['audio']['bitrate_mode'] == 'cbr') {
 282  
 283                  $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
 284  
 285              } else {
 286  
 287                  $encoder_options = strtoupper($info['audio']['bitrate_mode']);
 288  
 289              }
 290  
 291          } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
 292  
 293              $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
 294  
 295          } elseif (!empty($info['audio']['bitrate'])) {
 296  
 297              if ($info['audio']['bitrate_mode'] == 'cbr') {
 298                  $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
 299              } else {
 300                  $encoder_options = strtoupper($info['audio']['bitrate_mode']);
 301              }
 302  
 303          }
 304          if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
 305              $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
 306          }
 307  
 308          if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
 309              $encoder_options .= ' --nogap';
 310          }
 311  
 312          if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
 313              $ExplodedOptions = explode(' ', $encoder_options, 4);
 314              if ($ExplodedOptions[0] == '--r3mix') {
 315                  $ExplodedOptions[1] = 'r3mix';
 316              }
 317              switch ($ExplodedOptions[0]) {
 318                  case '--preset':
 319                  case '--alt-preset':
 320                  case '--r3mix':
 321                      if ($ExplodedOptions[1] == 'fast') {
 322                          $ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
 323                      }
 324                      switch ($ExplodedOptions[1]) {
 325                          case 'portable':
 326                          case 'medium':
 327                          case 'standard':
 328                          case 'extreme':
 329                          case 'insane':
 330                          case 'fast portable':
 331                          case 'fast medium':
 332                          case 'fast standard':
 333                          case 'fast extreme':
 334                          case 'fast insane':
 335                          case 'r3mix':
 336                              static $ExpectedLowpass = array(
 337                                      'insane|20500'        => 20500,
 338                                      'insane|20600'        => 20600,  // 3.90.2, 3.90.3, 3.91
 339                                      'medium|18000'        => 18000,
 340                                      'fast medium|18000'   => 18000,
 341                                      'extreme|19500'       => 19500,  // 3.90,   3.90.1, 3.92, 3.95
 342                                      'extreme|19600'       => 19600,  // 3.90.2, 3.90.3, 3.91, 3.93.1
 343                                      'fast extreme|19500'  => 19500,  // 3.90,   3.90.1, 3.92, 3.95
 344                                      'fast extreme|19600'  => 19600,  // 3.90.2, 3.90.3, 3.91, 3.93.1
 345                                      'standard|19000'      => 19000,
 346                                      'fast standard|19000' => 19000,
 347                                      'r3mix|19500'         => 19500,  // 3.90,   3.90.1, 3.92
 348                                      'r3mix|19600'         => 19600,  // 3.90.2, 3.90.3, 3.91
 349                                      'r3mix|18000'         => 18000,  // 3.94,   3.95
 350                                  );
 351                              if (!isset($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))) {
 352                                  $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
 353                              }
 354                              break;
 355  
 356                          default:
 357                              break;
 358                      }
 359                      break;
 360              }
 361          }
 362  
 363          if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
 364              if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
 365                  $encoder_options .= ' --resample 44100';
 366              } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
 367                  $encoder_options .= ' --resample 48000';
 368              } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
 369                  switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
 370                      case 0: // <= 32000
 371                          // may or may not be same as source frequency - ignore
 372                          break;
 373                      case 1: // 44100
 374                      case 2: // 48000
 375                      case 3: // 48000+
 376                          $ExplodedOptions = explode(' ', $encoder_options, 4);
 377                          switch ($ExplodedOptions[0]) {
 378                              case '--preset':
 379                              case '--alt-preset':
 380                                  switch ($ExplodedOptions[1]) {
 381                                      case 'fast':
 382                                      case 'portable':
 383                                      case 'medium':
 384                                      case 'standard':
 385                                      case 'extreme':
 386                                      case 'insane':
 387                                          $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
 388                                          break;
 389  
 390                                      default:
 391                                          static $ExpectedResampledRate = array(
 392                                                  'phon+/lw/mw-eu/sw|16000' => 16000,
 393                                                  'mw-us|24000'             => 24000, // 3.95
 394                                                  'mw-us|32000'             => 32000, // 3.93
 395                                                  'mw-us|16000'             => 16000, // 3.92
 396                                                  'phone|16000'             => 16000,
 397                                                  'phone|11025'             => 11025, // 3.94a15
 398                                                  'radio|32000'             => 32000, // 3.94a15
 399                                                  'fm/radio|32000'          => 32000, // 3.92
 400                                                  'fm|32000'                => 32000, // 3.90
 401                                                  'voice|32000'             => 32000);
 402                                          if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
 403                                              $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
 404                                          }
 405                                          break;
 406                                  }
 407                                  break;
 408  
 409                              case '--r3mix':
 410                              default:
 411                                  $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
 412                                  break;
 413                          }
 414                          break;
 415                  }
 416              }
 417          }
 418          if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
 419              //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
 420              $encoder_options = strtoupper($info['audio']['bitrate_mode']);
 421          }
 422  
 423          return $encoder_options;
 424      }
 425  
 426      /**
 427       * @param int   $offset
 428       * @param array $info
 429       * @param bool  $recursivesearch
 430       * @param bool  $ScanAsCBR
 431       * @param bool  $FastMPEGheaderScan
 432       *
 433       * @return bool
 434       */
 435  	public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
 436          static $MPEGaudioVersionLookup;
 437          static $MPEGaudioLayerLookup;
 438          static $MPEGaudioBitrateLookup;
 439          static $MPEGaudioFrequencyLookup;
 440          static $MPEGaudioChannelModeLookup;
 441          static $MPEGaudioModeExtensionLookup;
 442          static $MPEGaudioEmphasisLookup;
 443          if (empty($MPEGaudioVersionLookup)) {
 444              $MPEGaudioVersionLookup       = self::MPEGaudioVersionArray();
 445              $MPEGaudioLayerLookup         = self::MPEGaudioLayerArray();
 446              $MPEGaudioBitrateLookup       = self::MPEGaudioBitrateArray();
 447              $MPEGaudioFrequencyLookup     = self::MPEGaudioFrequencyArray();
 448              $MPEGaudioChannelModeLookup   = self::MPEGaudioChannelModeArray();
 449              $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
 450              $MPEGaudioEmphasisLookup      = self::MPEGaudioEmphasisArray();
 451          }
 452  
 453          if ($this->fseek($offset) != 0) {
 454              $this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$offset);
 455              return false;
 456          }
 457          //$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
 458          $headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
 459  
 460          // MP3 audio frame structure:
 461          // $aa $aa $aa $aa [$bb $bb] $cc...
 462          // where $aa..$aa is the four-byte mpeg-audio header (below)
 463          // $bb $bb is the optional 2-byte CRC
 464          // and $cc... is the audio data
 465  
 466          $head4 = substr($headerstring, 0, 4);
 467          $head4_key = getid3_lib::PrintHexBytes($head4, true, false, false);
 468          static $MPEGaudioHeaderDecodeCache = array();
 469          if (isset($MPEGaudioHeaderDecodeCache[$head4_key])) {
 470              $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4_key];
 471          } else {
 472              $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
 473              $MPEGaudioHeaderDecodeCache[$head4_key] = $MPEGheaderRawArray;
 474          }
 475  
 476          static $MPEGaudioHeaderValidCache = array();
 477          if (!isset($MPEGaudioHeaderValidCache[$head4_key])) { // Not in cache
 478              //$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true);  // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
 479              $MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
 480          }
 481  
 482          // shortcut
 483          if (!isset($info['mpeg']['audio'])) {
 484              $info['mpeg']['audio'] = array();
 485          }
 486          $thisfile_mpeg_audio = &$info['mpeg']['audio'];
 487  
 488          if ($MPEGaudioHeaderValidCache[$head4_key]) {
 489              $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
 490          } else {
 491              $this->error('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset);
 492              return false;
 493          }
 494  
 495          if (!$FastMPEGheaderScan) {
 496              $thisfile_mpeg_audio['version']       = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
 497              $thisfile_mpeg_audio['layer']         = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
 498  
 499              $thisfile_mpeg_audio['channelmode']   = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
 500              $thisfile_mpeg_audio['channels']      = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
 501              $thisfile_mpeg_audio['sample_rate']   = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
 502              $thisfile_mpeg_audio['protection']    = !$thisfile_mpeg_audio['raw']['protection'];
 503              $thisfile_mpeg_audio['private']       = (bool) $thisfile_mpeg_audio['raw']['private'];
 504              $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
 505              $thisfile_mpeg_audio['copyright']     = (bool) $thisfile_mpeg_audio['raw']['copyright'];
 506              $thisfile_mpeg_audio['original']      = (bool) $thisfile_mpeg_audio['raw']['original'];
 507              $thisfile_mpeg_audio['emphasis']      = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
 508  
 509              $info['audio']['channels']    = $thisfile_mpeg_audio['channels'];
 510              $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
 511  
 512              if ($thisfile_mpeg_audio['protection']) {
 513                  $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
 514              }
 515          }
 516  
 517          if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
 518              // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
 519              $this->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1');
 520              $thisfile_mpeg_audio['raw']['bitrate'] = 0;
 521          }
 522          $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
 523          $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
 524  
 525          if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
 526              // only skip multiple frame check if free-format bitstream found at beginning of file
 527              // otherwise is quite possibly simply corrupted data
 528              $recursivesearch = false;
 529          }
 530  
 531          // For Layer 2 there are some combinations of bitrate and mode which are not allowed.
 532          if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
 533  
 534              $info['audio']['dataformat'] = 'mp2';
 535              switch ($thisfile_mpeg_audio['channelmode']) {
 536  
 537                  case 'mono':
 538                      if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
 539                          // these are ok
 540                      } else {
 541                          $this->error($thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
 542                          return false;
 543                      }
 544                      break;
 545  
 546                  case 'stereo':
 547                  case 'joint stereo':
 548                  case 'dual channel':
 549                      if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
 550                          // these are ok
 551                      } else {
 552                          $this->error(intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
 553                          return false;
 554                      }
 555                      break;
 556  
 557              }
 558  
 559          }
 560  
 561  
 562          if ($info['audio']['sample_rate'] > 0) {
 563              $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
 564          }
 565  
 566          $nextframetestoffset = $offset + 1;
 567          if ($thisfile_mpeg_audio['bitrate'] != 'free') {
 568  
 569              $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
 570  
 571              if (isset($thisfile_mpeg_audio['framelength'])) {
 572                  $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
 573              } else {
 574                  $this->error('Frame at offset('.$offset.') is has an invalid frame length.');
 575                  return false;
 576              }
 577  
 578          }
 579  
 580          $ExpectedNumberOfAudioBytes = 0;
 581  
 582          ////////////////////////////////////////////////////////////////////////////////////
 583          // Variable-bitrate headers
 584  
 585          if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
 586              // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
 587              // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
 588  
 589              $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
 590              $thisfile_mpeg_audio['VBR_method']   = 'Fraunhofer';
 591              $info['audio']['codec']              = 'Fraunhofer';
 592  
 593              $SideInfoData = substr($headerstring, 4 + 2, 32);
 594  
 595              $FraunhoferVBROffset = 36;
 596  
 597              $thisfile_mpeg_audio['VBR_encoder_version']     = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  4, 2)); // VbriVersion
 598              $thisfile_mpeg_audio['VBR_encoder_delay']       = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  6, 2)); // VbriDelay
 599              $thisfile_mpeg_audio['VBR_quality']             = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  8, 2)); // VbriQuality
 600              $thisfile_mpeg_audio['VBR_bytes']               = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
 601              $thisfile_mpeg_audio['VBR_frames']              = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
 602              $thisfile_mpeg_audio['VBR_seek_offsets']        = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
 603              $thisfile_mpeg_audio['VBR_seek_scale']          = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
 604              $thisfile_mpeg_audio['VBR_entry_bytes']         = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
 605              $thisfile_mpeg_audio['VBR_entry_frames']        = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames
 606  
 607              $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
 608  
 609              $previousbyteoffset = $offset;
 610              for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
 611                  $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
 612                  $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
 613                  $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
 614                  $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
 615                  $previousbyteoffset += $Fraunhofer_OffsetN;
 616              }
 617  
 618  
 619          } else {
 620  
 621              // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
 622              // depending on MPEG layer and number of channels
 623  
 624              $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
 625              $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
 626  
 627              if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
 628                  // 'Xing' is traditional Xing VBR frame
 629                  // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
 630                  // 'Info' *can* legally be used to specify a VBR file as well, however.
 631  
 632                  // http://www.multiweb.cz/twoinches/MP3inside.htm
 633                  //00..03 = "Xing" or "Info"
 634                  //04..07 = Flags:
 635                  //  0x01  Frames Flag     set if value for number of frames in file is stored
 636                  //  0x02  Bytes Flag      set if value for filesize in bytes is stored
 637                  //  0x04  TOC Flag        set if values for TOC are stored
 638                  //  0x08  VBR Scale Flag  set if values for VBR scale is stored
 639                  //08..11  Frames: Number of frames in file (including the first Xing/Info one)
 640                  //12..15  Bytes:  File length in Bytes
 641                  //16..115  TOC (Table of Contents):
 642                  //  Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
 643                  //  Each Byte has a value according this formula:
 644                  //  (TOC[i] / 256) * fileLenInBytes
 645                  //  So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
 646                  //  TOC[(60/240)*100] = TOC[25]
 647                  //  and corresponding Byte in file is then approximately at:
 648                  //  (TOC[25]/256) * 5000000
 649                  //116..119  VBR Scale
 650  
 651  
 652                  // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
 653  //                if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
 654                      $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
 655                      $thisfile_mpeg_audio['VBR_method']   = 'Xing';
 656  //                } else {
 657  //                    $ScanAsCBR = true;
 658  //                    $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
 659  //                }
 660  
 661                  $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
 662  
 663                  $thisfile_mpeg_audio['xing_flags']['frames']    = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
 664                  $thisfile_mpeg_audio['xing_flags']['bytes']     = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
 665                  $thisfile_mpeg_audio['xing_flags']['toc']       = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
 666                  $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
 667  
 668                  if ($thisfile_mpeg_audio['xing_flags']['frames']) {
 669                      $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset +  8, 4));
 670                      //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
 671                  }
 672                  if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
 673                      $thisfile_mpeg_audio['VBR_bytes']  = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
 674                  }
 675  
 676                  //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
 677                  //if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
 678                  if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
 679                      $used_filesize  = 0;
 680                      if (!empty($thisfile_mpeg_audio['VBR_bytes'])) {
 681                          $used_filesize = $thisfile_mpeg_audio['VBR_bytes'];
 682                      } elseif (!empty($info['filesize'])) {
 683                          $used_filesize  = $info['filesize'];
 684                          $used_filesize -= (isset($info['id3v2']['headerlength']) ? intval($info['id3v2']['headerlength']) : 0);
 685                          $used_filesize -= (isset($info['id3v1']) ? 128 : 0);
 686                          $used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0);
 687                          $this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes');
 688                      }
 689  
 690                      $framelengthfloat = $used_filesize / $thisfile_mpeg_audio['VBR_frames'];
 691  
 692                      if ($thisfile_mpeg_audio['layer'] == '1') {
 693                          // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
 694                          //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
 695                          $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
 696                      } else {
 697                          // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
 698                          //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
 699                          $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
 700                      }
 701                      $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
 702                  }
 703  
 704                  if ($thisfile_mpeg_audio['xing_flags']['toc']) {
 705                      $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
 706                      for ($i = 0; $i < 100; $i++) {
 707                          $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData[$i]);
 708                      }
 709                  }
 710                  if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
 711                      $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
 712                  }
 713  
 714  
 715                  // http://gabriel.mp3-tech.org/mp3infotag.html
 716                  if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
 717  
 718                      // shortcut
 719                      $thisfile_mpeg_audio['LAME'] = array();
 720                      $thisfile_mpeg_audio_lame    = &$thisfile_mpeg_audio['LAME'];
 721  
 722  
 723                      $thisfile_mpeg_audio_lame['long_version']  = substr($headerstring, $VBRidOffset + 120, 20);
 724                      $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
 725                      $thisfile_mpeg_audio_lame['numeric_version'] = str_replace('LAME', '', $thisfile_mpeg_audio_lame['short_version']);
 726                      if (preg_match('#^LAME([0-9\\.a-z]+)#', $thisfile_mpeg_audio_lame['long_version'], $matches)) {
 727                          $thisfile_mpeg_audio_lame['short_version']   = $matches[0];
 728                          $thisfile_mpeg_audio_lame['numeric_version'] = $matches[1];
 729                      }
 730                      foreach (explode('.', $thisfile_mpeg_audio_lame['numeric_version']) as $key => $number) {
 731                          $thisfile_mpeg_audio_lame['integer_version'][$key] = intval($number);
 732                      }
 733  
 734                      //if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
 735                      if ((($thisfile_mpeg_audio_lame['integer_version'][0] * 1000) + $thisfile_mpeg_audio_lame['integer_version'][1]) >= 3090) { // cannot use string version compare, may have "LAME3.90" or "LAME3.100" -- see https://github.com/JamesHeinrich/getID3/issues/207
 736  
 737                          // extra 11 chars are not part of version string when LAMEtag present
 738                          unset($thisfile_mpeg_audio_lame['long_version']);
 739  
 740                          // It the LAME tag was only introduced in LAME v3.90
 741                          // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
 742  
 743                          // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
 744                          // are assuming a 'Xing' identifier offset of 0x24, which is the case for
 745                          // MPEG-1 non-mono, but not for other combinations
 746                          $LAMEtagOffsetContant = $VBRidOffset - 0x24;
 747  
 748                          // shortcuts
 749                          $thisfile_mpeg_audio_lame['RGAD']    = array('track'=>array(), 'album'=>array());
 750                          $thisfile_mpeg_audio_lame_RGAD       = &$thisfile_mpeg_audio_lame['RGAD'];
 751                          $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
 752                          $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
 753                          $thisfile_mpeg_audio_lame['raw'] = array();
 754                          $thisfile_mpeg_audio_lame_raw    = &$thisfile_mpeg_audio_lame['raw'];
 755  
 756                          // byte $9B  VBR Quality
 757                          // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
 758                          // Actually overwrites original Xing bytes
 759                          unset($thisfile_mpeg_audio['VBR_scale']);
 760                          $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
 761  
 762                          // bytes $9C-$A4  Encoder short VersionString
 763                          $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
 764  
 765                          // byte $A5  Info Tag revision + VBR method
 766                          $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
 767  
 768                          $thisfile_mpeg_audio_lame['tag_revision']   = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
 769                          $thisfile_mpeg_audio_lame_raw['vbr_method'] =  $LAMEtagRevisionVBRmethod & 0x0F;
 770                          $thisfile_mpeg_audio_lame['vbr_method']     = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
 771                          $thisfile_mpeg_audio['bitrate_mode']        = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
 772  
 773                          // byte $A6  Lowpass filter value
 774                          $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
 775  
 776                          // bytes $A7-$AE  Replay Gain
 777                          // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
 778                          // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
 779                          if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
 780                              // LAME 3.94a16 and later - 9.23 fixed point
 781                              // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
 782                              $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
 783                          } else {
 784                              // LAME 3.94a15 and earlier - 32-bit floating point
 785                              // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
 786                              $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
 787                          }
 788                          if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
 789                              unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
 790                          } else {
 791                              $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
 792                          }
 793  
 794                          $thisfile_mpeg_audio_lame_raw['RGAD_track']      =   getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
 795                          $thisfile_mpeg_audio_lame_raw['RGAD_album']      =   getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
 796  
 797  
 798                          if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
 799  
 800                              $thisfile_mpeg_audio_lame_RGAD_track['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
 801                              $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
 802                              $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
 803                              $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] =  $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
 804                              $thisfile_mpeg_audio_lame_RGAD_track['name']       = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
 805                              $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
 806                              $thisfile_mpeg_audio_lame_RGAD_track['gain_db']    = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
 807  
 808                              if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
 809                                  $info['replay_gain']['track']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
 810                              }
 811                              $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
 812                              $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
 813                          } else {
 814                              unset($thisfile_mpeg_audio_lame_RGAD['track']);
 815                          }
 816                          if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
 817  
 818                              $thisfile_mpeg_audio_lame_RGAD_album['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
 819                              $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
 820                              $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
 821                              $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
 822                              $thisfile_mpeg_audio_lame_RGAD_album['name']       = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
 823                              $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
 824                              $thisfile_mpeg_audio_lame_RGAD_album['gain_db']    = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
 825  
 826                              if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
 827                                  $info['replay_gain']['album']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
 828                              }
 829                              $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
 830                              $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
 831                          } else {
 832                              unset($thisfile_mpeg_audio_lame_RGAD['album']);
 833                          }
 834                          if (empty($thisfile_mpeg_audio_lame_RGAD)) {
 835                              unset($thisfile_mpeg_audio_lame['RGAD']);
 836                          }
 837  
 838  
 839                          // byte $AF  Encoding flags + ATH Type
 840                          $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
 841                          $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune']   = (bool) ($EncodingFlagsATHtype & 0x10);
 842                          $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
 843                          $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']  = (bool) ($EncodingFlagsATHtype & 0x40);
 844                          $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']  = (bool) ($EncodingFlagsATHtype & 0x80);
 845                          $thisfile_mpeg_audio_lame['ath_type']                      =         $EncodingFlagsATHtype & 0x0F;
 846  
 847                          // byte $B0  if ABR {specified bitrate} else {minimal bitrate}
 848                          $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
 849                          if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
 850                              $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
 851                          } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
 852                              // ignore
 853                          } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
 854                              $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
 855                          }
 856  
 857                          // bytes $B1-$B3  Encoder delays
 858                          $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
 859                          $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
 860                          $thisfile_mpeg_audio_lame['end_padding']   =  $EncoderDelays & 0x000FFF;
 861  
 862                          // byte $B4  Misc
 863                          $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
 864                          $thisfile_mpeg_audio_lame_raw['noise_shaping']       = ($MiscByte & 0x03);
 865                          $thisfile_mpeg_audio_lame_raw['stereo_mode']         = ($MiscByte & 0x1C) >> 2;
 866                          $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
 867                          $thisfile_mpeg_audio_lame_raw['source_sample_freq']  = ($MiscByte & 0xC0) >> 6;
 868                          $thisfile_mpeg_audio_lame['noise_shaping']       = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
 869                          $thisfile_mpeg_audio_lame['stereo_mode']         = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
 870                          $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
 871                          $thisfile_mpeg_audio_lame['source_sample_freq']  = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
 872  
 873                          // byte $B5  MP3 Gain
 874                          $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
 875                          $thisfile_mpeg_audio_lame['mp3_gain_db']     = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
 876                          $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
 877  
 878                          // bytes $B6-$B7  Preset and surround info
 879                          $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
 880                          // Reserved                                                    = ($PresetSurroundBytes & 0xC000);
 881                          $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
 882                          $thisfile_mpeg_audio_lame['surround_info']     = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
 883                          $thisfile_mpeg_audio_lame['preset_used_id']    = ($PresetSurroundBytes & 0x07FF);
 884                          $thisfile_mpeg_audio_lame['preset_used']       = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
 885                          if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
 886                              $this->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');
 887                          }
 888                          if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
 889                              // this may change if 3.90.4 ever comes out
 890                              $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
 891                          }
 892  
 893                          // bytes $B8-$BB  MusicLength
 894                          $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
 895                          $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
 896  
 897                          // bytes $BC-$BD  MusicCRC
 898                          $thisfile_mpeg_audio_lame['music_crc']    = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
 899  
 900                          // bytes $BE-$BF  CRC-16 of Info Tag
 901                          $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
 902  
 903  
 904                          // LAME CBR
 905                          if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
 906  
 907                              $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
 908                              $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
 909                              $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
 910                              //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
 911                              //    $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
 912                              //}
 913  
 914                          }
 915  
 916                      }
 917                  }
 918  
 919              } else {
 920  
 921                  // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
 922                  $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
 923                  if ($recursivesearch) {
 924                      $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
 925                      if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
 926                          $recursivesearch = false;
 927                          $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
 928                      }
 929                      if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
 930                          $this->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');
 931                      }
 932                  }
 933  
 934              }
 935  
 936          }
 937  
 938          if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
 939              if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
 940                  if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) {
 941                      // ignore, audio data is broken into chunks so will always be data "missing"
 942                  }
 943                  elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
 944                      $this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
 945                  }
 946                  else {
 947                      $this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');
 948                  }
 949              } else {
 950                  if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
 951                  //    $prenullbytefileoffset = $this->ftell();
 952                  //    $this->fseek($info['avdataend']);
 953                  //    $PossibleNullByte = $this->fread(1);
 954                  //    $this->fseek($prenullbytefileoffset);
 955                  //    if ($PossibleNullByte === "\x00") {
 956                          $info['avdataend']--;
 957                  //        $this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored');
 958                  //    } else {
 959                  //        $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
 960                  //    }
 961                  } else {
 962                      $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
 963                  }
 964              }
 965          }
 966  
 967          if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
 968              if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
 969                  $framebytelength = $this->FreeFormatFrameLength($offset, true);
 970                  if ($framebytelength > 0) {
 971                      $thisfile_mpeg_audio['framelength'] = $framebytelength;
 972                      if ($thisfile_mpeg_audio['layer'] == '1') {
 973                          // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
 974                          $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
 975                      } else {
 976                          // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
 977                          $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
 978                      }
 979                  } else {
 980                      $this->error('Error calculating frame length of free-format MP3 without Xing/LAME header');
 981                  }
 982              }
 983          }
 984  
 985          if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
 986              switch ($thisfile_mpeg_audio['bitrate_mode']) {
 987                  case 'vbr':
 988                  case 'abr':
 989                      $bytes_per_frame = 1152;
 990                      if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
 991                          $bytes_per_frame = 384;
 992                      } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
 993                          $bytes_per_frame = 576;
 994                      }
 995                      $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
 996                      if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
 997                          $info['audio']['bitrate']       = $thisfile_mpeg_audio['VBR_bitrate'];
 998                          $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
 999                      }
1000                      break;
1001              }
1002          }
1003  
1004          // End variable-bitrate headers
1005          ////////////////////////////////////////////////////////////////////////////////////
1006  
1007          if ($recursivesearch) {
1008  
1009              if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
1010                  return false;
1011              }
1012  
1013          }
1014  
1015  
1016          //if (false) {
1017          //    // experimental side info parsing section - not returning anything useful yet
1018          //
1019          //    $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
1020          //    $SideInfoOffset = 0;
1021          //
1022          //    if ($thisfile_mpeg_audio['version'] == '1') {
1023          //        if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1024          //            // MPEG-1 (mono)
1025          //            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1026          //            $SideInfoOffset += 9;
1027          //            $SideInfoOffset += 5;
1028          //        } else {
1029          //            // MPEG-1 (stereo, joint-stereo, dual-channel)
1030          //            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1031          //            $SideInfoOffset += 9;
1032          //            $SideInfoOffset += 3;
1033          //        }
1034          //    } else { // 2 or 2.5
1035          //        if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1036          //            // MPEG-2, MPEG-2.5 (mono)
1037          //            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1038          //            $SideInfoOffset += 8;
1039          //            $SideInfoOffset += 1;
1040          //        } else {
1041          //            // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
1042          //            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1043          //            $SideInfoOffset += 8;
1044          //            $SideInfoOffset += 2;
1045          //        }
1046          //    }
1047          //
1048          //    if ($thisfile_mpeg_audio['version'] == '1') {
1049          //        for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1050          //            for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
1051          //                $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1052          //                $SideInfoOffset += 2;
1053          //            }
1054          //        }
1055          //    }
1056          //    for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
1057          //        for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1058          //            $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
1059          //            $SideInfoOffset += 12;
1060          //            $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1061          //            $SideInfoOffset += 9;
1062          //            $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1063          //            $SideInfoOffset += 8;
1064          //            if ($thisfile_mpeg_audio['version'] == '1') {
1065          //                $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1066          //                $SideInfoOffset += 4;
1067          //            } else {
1068          //                $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1069          //                $SideInfoOffset += 9;
1070          //            }
1071          //            $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1072          //            $SideInfoOffset += 1;
1073          //
1074          //            if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
1075          //
1076          //                $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
1077          //                $SideInfoOffset += 2;
1078          //                $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1079          //                $SideInfoOffset += 1;
1080          //
1081          //                for ($region = 0; $region < 2; $region++) {
1082          //                    $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1083          //                    $SideInfoOffset += 5;
1084          //                }
1085          //                $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
1086          //
1087          //                for ($window = 0; $window < 3; $window++) {
1088          //                    $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1089          //                    $SideInfoOffset += 3;
1090          //                }
1091          //
1092          //            } else {
1093          //
1094          //                for ($region = 0; $region < 3; $region++) {
1095          //                    $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1096          //                    $SideInfoOffset += 5;
1097          //                }
1098          //
1099          //                $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1100          //                $SideInfoOffset += 4;
1101          //                $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1102          //                $SideInfoOffset += 3;
1103          //                $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
1104          //            }
1105          //
1106          //            if ($thisfile_mpeg_audio['version'] == '1') {
1107          //                $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1108          //                $SideInfoOffset += 1;
1109          //            }
1110          //            $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1111          //            $SideInfoOffset += 1;
1112          //            $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1113          //            $SideInfoOffset += 1;
1114          //        }
1115          //    }
1116          //}
1117  
1118          return true;
1119      }
1120  
1121      /**
1122       * @param int $offset
1123       * @param int $nextframetestoffset
1124       * @param bool $ScanAsCBR
1125       *
1126       * @return bool
1127       */
1128  	public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) {
1129          $info = &$this->getid3->info;
1130          $firstframetestarray = array('error' => array(), 'warning'=> array(), 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
1131          $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
1132  
1133          for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
1134              // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
1135              if (($nextframetestoffset + 4) >= $info['avdataend']) {
1136                  // end of file
1137                  return true;
1138              }
1139  
1140              $nextframetestarray = array('error' => array(), 'warning' => array(), 'avdataend' => $info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1141              if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
1142                  if ($ScanAsCBR) {
1143                      // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
1144                      if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
1145                          return false;
1146                      }
1147                  }
1148  
1149  
1150                  // next frame is OK, get ready to check the one after that
1151                  if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1152                      $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
1153                  } else {
1154                      $this->error('Frame at offset ('.$offset.') is has an invalid frame length.');
1155                      return false;
1156                  }
1157  
1158              } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
1159  
1160                  // 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
1161                  return true;
1162  
1163              } else {
1164  
1165                  // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
1166                  $this->warning('Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.');
1167  
1168                  return false;
1169              }
1170          }
1171          return true;
1172      }
1173  
1174      /**
1175       * @param int  $offset
1176       * @param bool $deepscan
1177       *
1178       * @return int|false
1179       */
1180  	public function FreeFormatFrameLength($offset, $deepscan=false) {
1181          $info = &$this->getid3->info;
1182  
1183          $this->fseek($offset);
1184          $MPEGaudioData = $this->fread(32768);
1185  
1186          $SyncPattern1 = substr($MPEGaudioData, 0, 4);
1187          // may be different pattern due to padding
1188          $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) | 0x02).$SyncPattern1[3];
1189          if ($SyncPattern2 === $SyncPattern1) {
1190              $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) & 0xFD).$SyncPattern1[3];
1191          }
1192  
1193          $framelength = false;
1194          $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1195          $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1196          if ($framelength1 > 4) {
1197              $framelength = $framelength1;
1198          }
1199          if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1200              $framelength = $framelength2;
1201          }
1202          if (!$framelength) {
1203  
1204              // LAME 3.88 has a different value for modeextension on the first frame vs the rest
1205              $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
1206              $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
1207  
1208              if ($framelength1 > 4) {
1209                  $framelength = $framelength1;
1210              }
1211              if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1212                  $framelength = $framelength2;
1213              }
1214              if (!$framelength) {
1215                  $this->error('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset);
1216                  return false;
1217              } else {
1218                  $this->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)');
1219                  $info['audio']['codec']   = 'LAME';
1220                  $info['audio']['encoder'] = 'LAME3.88';
1221                  $SyncPattern1 = substr($SyncPattern1, 0, 3);
1222                  $SyncPattern2 = substr($SyncPattern2, 0, 3);
1223              }
1224          }
1225  
1226          if ($deepscan) {
1227  
1228              $ActualFrameLengthValues = array();
1229              $nextoffset = $offset + $framelength;
1230              while ($nextoffset < ($info['avdataend'] - 6)) {
1231                  $this->fseek($nextoffset - 1);
1232                  $NextSyncPattern = $this->fread(6);
1233                  if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
1234                      // good - found where expected
1235                      $ActualFrameLengthValues[] = $framelength;
1236                  } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
1237                      // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1238                      $ActualFrameLengthValues[] = ($framelength - 1);
1239                      $nextoffset--;
1240                  } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
1241                      // ok - found one byte later than expected (last frame was padded, first frame wasn't)
1242                      $ActualFrameLengthValues[] = ($framelength + 1);
1243                      $nextoffset++;
1244                  } else {
1245                      $this->error('Did not find expected free-format sync pattern at offset '.$nextoffset);
1246                      return false;
1247                  }
1248                  $nextoffset += $framelength;
1249              }
1250              if (count($ActualFrameLengthValues) > 0) {
1251                  $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1252              }
1253          }
1254          return $framelength;
1255      }
1256  
1257      /**
1258       * @return bool
1259       */
1260  	public function getOnlyMPEGaudioInfoBruteForce() {
1261          $MPEGaudioHeaderDecodeCache   = array();
1262          $MPEGaudioHeaderValidCache    = array();
1263          $MPEGaudioHeaderLengthCache   = array();
1264          $MPEGaudioVersionLookup       = self::MPEGaudioVersionArray();
1265          $MPEGaudioLayerLookup         = self::MPEGaudioLayerArray();
1266          $MPEGaudioBitrateLookup       = self::MPEGaudioBitrateArray();
1267          $MPEGaudioFrequencyLookup     = self::MPEGaudioFrequencyArray();
1268          $MPEGaudioChannelModeLookup   = self::MPEGaudioChannelModeArray();
1269          $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1270          $MPEGaudioEmphasisLookup      = self::MPEGaudioEmphasisArray();
1271          $LongMPEGversionLookup        = array();
1272          $LongMPEGlayerLookup          = array();
1273          $LongMPEGbitrateLookup        = array();
1274          $LongMPEGpaddingLookup        = array();
1275          $LongMPEGfrequencyLookup      = array();
1276          $Distribution['bitrate']      = array();
1277          $Distribution['frequency']    = array();
1278          $Distribution['layer']        = array();
1279          $Distribution['version']      = array();
1280          $Distribution['padding']      = array();
1281  
1282          $info = &$this->getid3->info;
1283          $this->fseek($info['avdataoffset']);
1284  
1285          $max_frames_scan = 5000;
1286          $frames_scanned  = 0;
1287  
1288          $previousvalidframe = $info['avdataoffset'];
1289          while ($this->ftell() < $info['avdataend']) {
1290              set_time_limit(30);
1291              $head4 = $this->fread(4);
1292              if (strlen($head4) < 4) {
1293                  break;
1294              }
1295              if ($head4[0] != "\xFF") {
1296                  for ($i = 1; $i < 4; $i++) {
1297                      if ($head4[$i] == "\xFF") {
1298                          $this->fseek($i - 4, SEEK_CUR);
1299                          continue 2;
1300                      }
1301                  }
1302                  continue;
1303              }
1304              if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1305                  $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
1306              }
1307              if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1308                  $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
1309              }
1310              if ($MPEGaudioHeaderValidCache[$head4]) {
1311  
1312                  if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
1313                      $LongMPEGversionLookup[$head4]   = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
1314                      $LongMPEGlayerLookup[$head4]     = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
1315                      $LongMPEGbitrateLookup[$head4]   = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
1316                      $LongMPEGpaddingLookup[$head4]   = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
1317                      $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
1318                      $MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
1319                          $LongMPEGbitrateLookup[$head4],
1320                          $LongMPEGversionLookup[$head4],
1321                          $LongMPEGlayerLookup[$head4],
1322                          $LongMPEGpaddingLookup[$head4],
1323                          $LongMPEGfrequencyLookup[$head4]);
1324                  }
1325                  if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
1326                      $WhereWeWere = $this->ftell();
1327                      $this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
1328                      $next4 = $this->fread(4);
1329                      if ($next4[0] == "\xFF") {
1330                          if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
1331                              $MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
1332                          }
1333                          if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1334                              $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
1335                          }
1336                          if ($MPEGaudioHeaderValidCache[$next4]) {
1337                              $this->fseek(-4, SEEK_CUR);
1338  
1339                              $Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]] = isset($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]) ? ++$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]] : 1;
1340                              $Distribution['layer'][$LongMPEGlayerLookup[$head4]] = isset($Distribution['layer'][$LongMPEGlayerLookup[$head4]]) ? ++$Distribution['layer'][$LongMPEGlayerLookup[$head4]] : 1;
1341                              $Distribution['version'][$LongMPEGversionLookup[$head4]] = isset($Distribution['version'][$LongMPEGversionLookup[$head4]]) ? ++$Distribution['version'][$LongMPEGversionLookup[$head4]] : 1;
1342                              $Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])] = isset($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]) ? ++$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])] : 1;
1343                              $Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]] = isset($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]) ? ++$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]] : 1;
1344                              if (++$frames_scanned >= $max_frames_scan) {
1345                                  $pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
1346                                  $this->warning('too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.');
1347                                  foreach ($Distribution as $key1 => $value1) {
1348                                      foreach ($value1 as $key2 => $value2) {
1349                                          $Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
1350                                      }
1351                                  }
1352                                  break;
1353                              }
1354                              continue;
1355                          }
1356                      }
1357                      unset($next4);
1358                      $this->fseek($WhereWeWere - 3);
1359                  }
1360  
1361              }
1362          }
1363          foreach ($Distribution as $key => $value) {
1364              ksort($Distribution[$key], SORT_NUMERIC);
1365          }
1366          ksort($Distribution['version'], SORT_STRING);
1367          $info['mpeg']['audio']['bitrate_distribution']   = $Distribution['bitrate'];
1368          $info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
1369          $info['mpeg']['audio']['layer_distribution']     = $Distribution['layer'];
1370          $info['mpeg']['audio']['version_distribution']   = $Distribution['version'];
1371          $info['mpeg']['audio']['padding_distribution']   = $Distribution['padding'];
1372          if (count($Distribution['version']) > 1) {
1373              $this->error('Corrupt file - more than one MPEG version detected');
1374          }
1375          if (count($Distribution['layer']) > 1) {
1376              $this->error('Corrupt file - more than one MPEG layer detected');
1377          }
1378          if (count($Distribution['frequency']) > 1) {
1379              $this->error('Corrupt file - more than one MPEG sample rate detected');
1380          }
1381  
1382  
1383          $bittotal = 0;
1384          foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1385              if ($bitratevalue != 'free') {
1386                  $bittotal += ($bitratevalue * $bitratecount);
1387              }
1388          }
1389          $info['mpeg']['audio']['frame_count']  = array_sum($Distribution['bitrate']);
1390          if ($info['mpeg']['audio']['frame_count'] == 0) {
1391              $this->error('no MPEG audio frames found');
1392              return false;
1393          }
1394          $info['mpeg']['audio']['bitrate']      = ($bittotal / $info['mpeg']['audio']['frame_count']);
1395          $info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
1396          $info['mpeg']['audio']['sample_rate']  = getid3_lib::array_max($Distribution['frequency'], true);
1397  
1398          $info['audio']['bitrate']      = $info['mpeg']['audio']['bitrate'];
1399          $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1400          $info['audio']['sample_rate']  = $info['mpeg']['audio']['sample_rate'];
1401          $info['audio']['dataformat']   = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
1402          $info['fileformat']            = $info['audio']['dataformat'];
1403  
1404          return true;
1405      }
1406  
1407      /**
1408       * @param int  $avdataoffset
1409       * @param bool $BitrateHistogram
1410       *
1411       * @return bool
1412       */
1413  	public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) {
1414          // looks for synch, decodes MPEG audio header
1415  
1416          $info = &$this->getid3->info;
1417  
1418          static $MPEGaudioVersionLookup;
1419          static $MPEGaudioLayerLookup;
1420          static $MPEGaudioBitrateLookup;
1421          if (empty($MPEGaudioVersionLookup)) {
1422              $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1423              $MPEGaudioLayerLookup   = self::MPEGaudioLayerArray();
1424              $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1425          }
1426  
1427          $this->fseek($avdataoffset);
1428          $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset);
1429          if ($sync_seek_buffer_size <= 0) {
1430              $this->error('Invalid $sync_seek_buffer_size at offset '.$avdataoffset);
1431              return false;
1432          }
1433          $header = $this->fread($sync_seek_buffer_size);
1434          $sync_seek_buffer_size = strlen($header);
1435          $SynchSeekOffset = 0;
1436          while ($SynchSeekOffset < $sync_seek_buffer_size) {
1437              if ((($avdataoffset + $SynchSeekOffset)  < $info['avdataend']) && !feof($this->getid3->fp)) {
1438  
1439                  if ($SynchSeekOffset > $sync_seek_buffer_size) {
1440                      // if a synch's not found within the first 128k bytes, then give up
1441                      $this->error('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB');
1442                      if (isset($info['audio']['bitrate'])) {
1443                          unset($info['audio']['bitrate']);
1444                      }
1445                      if (isset($info['mpeg']['audio'])) {
1446                          unset($info['mpeg']['audio']);
1447                      }
1448                      if (empty($info['mpeg'])) {
1449                          unset($info['mpeg']);
1450                      }
1451                      return false;
1452  
1453                  } elseif (feof($this->getid3->fp)) {
1454  
1455                      $this->error('Could not find valid MPEG audio synch before end of file');
1456                      if (isset($info['audio']['bitrate'])) {
1457                          unset($info['audio']['bitrate']);
1458                      }
1459                      if (isset($info['mpeg']['audio'])) {
1460                          unset($info['mpeg']['audio']);
1461                      }
1462                      if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) {
1463                          unset($info['mpeg']);
1464                      }
1465                      return false;
1466                  }
1467              }
1468  
1469              if (($SynchSeekOffset + 1) >= strlen($header)) {
1470                  $this->error('Could not find valid MPEG synch before end of file');
1471                  return false;
1472              }
1473  
1474              if (($header[$SynchSeekOffset] == "\xFF") && ($header[($SynchSeekOffset + 1)] > "\xE0")) { // synch detected
1475                  $FirstFrameAVDataOffset = null;
1476                  if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
1477                      $FirstFrameThisfileInfo = $info;
1478                      $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
1479                      if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) {
1480                          // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1481                          // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1482                          unset($FirstFrameThisfileInfo);
1483                      }
1484                  }
1485  
1486                  $dummy = $info; // only overwrite real data if valid header found
1487                  if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
1488                      $info = $dummy;
1489                      $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1490                      switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
1491                          case '':
1492                          case 'id3':
1493                          case 'ape':
1494                          case 'mp3':
1495                              $info['fileformat']          = 'mp3';
1496                              $info['audio']['dataformat'] = 'mp3';
1497                              break;
1498                      }
1499                      if (isset($FirstFrameThisfileInfo) && isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1500                          if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
1501                              // If there is garbage data between a valid VBR header frame and a sequence
1502                              // of valid MPEG-audio frames the VBR data is no longer discarded.
1503                              $info = $FirstFrameThisfileInfo;
1504                              $info['avdataoffset']        = $FirstFrameAVDataOffset;
1505                              $info['fileformat']          = 'mp3';
1506                              $info['audio']['dataformat'] = 'mp3';
1507                              $dummy                       = $info;
1508                              unset($dummy['mpeg']['audio']);
1509                              $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1510                              $GarbageOffsetEnd   = $avdataoffset + $SynchSeekOffset;
1511                              if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) {
1512                                  $info = $dummy;
1513                                  $info['avdataoffset'] = $GarbageOffsetEnd;
1514                                  $this->warning('apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd);
1515                              } else {
1516                                  $this->warning('using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')');
1517                              }
1518                          }
1519                      }
1520                      if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
1521                          // VBR file with no VBR header
1522                          $BitrateHistogram = true;
1523                      }
1524  
1525                      if ($BitrateHistogram) {
1526  
1527                          $info['mpeg']['audio']['stereo_distribution']  = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1528                          $info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
1529  
1530                          if ($info['mpeg']['audio']['version'] == '1') {
1531                              if ($info['mpeg']['audio']['layer'] == 3) {
1532                                  $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
1533                              } elseif ($info['mpeg']['audio']['layer'] == 2) {
1534                                  $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
1535                              } elseif ($info['mpeg']['audio']['layer'] == 1) {
1536                                  $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1537                              }
1538                          } elseif ($info['mpeg']['audio']['layer'] == 1) {
1539                              $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);
1540                          } else {
1541                              $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);
1542                          }
1543  
1544                          $dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1545                          $synchstartoffset = $info['avdataoffset'];
1546                          $this->fseek($info['avdataoffset']);
1547  
1548                          // you can play with these numbers:
1549                          $max_frames_scan  = 50000;
1550                          $max_scan_segments = 10;
1551  
1552                          // don't play with these numbers:
1553                          $FastMode = false;
1554                          $SynchErrorsFound = 0;
1555                          $frames_scanned   = 0;
1556                          $this_scan_segment = 0;
1557                          $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
1558                          $pct_data_scanned = 0;
1559                          for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
1560                              $frames_scanned_this_segment = 0;
1561                              if ($this->ftell() >= $info['avdataend']) {
1562                                  break;
1563                              }
1564                              $scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
1565                              if ($current_segment > 0) {
1566                                  $this->fseek($scan_start_offset[$current_segment]);
1567                                  $buffer_4k = $this->fread(4096);
1568                                  for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
1569                                      if (($buffer_4k[$j] == "\xFF") && ($buffer_4k[($j + 1)] > "\xE0")) { // synch detected
1570                                          if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
1571                                              $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
1572                                              if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) {
1573                                                  $scan_start_offset[$current_segment] += $j;
1574                                                  break;
1575                                              }
1576                                          }
1577                                      }
1578                                  }
1579                              }
1580                              $synchstartoffset = $scan_start_offset[$current_segment];
1581                              while (($synchstartoffset < $info['avdataend']) && $this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) {
1582                                  $FastMode = true;
1583                                  $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1584  
1585                                  if (empty($dummy['mpeg']['audio']['framelength'])) {
1586                                      $SynchErrorsFound++;
1587                                      $synchstartoffset++;
1588                                  } else {
1589                                      getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
1590                                      getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
1591                                      getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
1592                                      $synchstartoffset += $dummy['mpeg']['audio']['framelength'];
1593                                  }
1594                                  $frames_scanned++;
1595                                  if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
1596                                      $this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']);
1597                                      if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
1598                                          // file likely contains < $max_frames_scan, just scan as one segment
1599                                          $max_scan_segments = 1;
1600                                          $frames_scan_per_segment = $max_frames_scan;
1601                                      } else {
1602                                          $pct_data_scanned += $this_pct_scanned;
1603                                          break;
1604                                      }
1605                                  }
1606                              }
1607                          }
1608                          if ($pct_data_scanned > 0) {
1609                              $this->warning('too many MPEG audio frames to scan, only scanned '.$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.');
1610                              foreach ($info['mpeg']['audio'] as $key1 => $value1) {
1611                                  if (!preg_match('#_distribution$#i', $key1)) {
1612                                      continue;
1613                                  }
1614                                  foreach ($value1 as $key2 => $value2) {
1615                                      $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
1616                                  }
1617                              }
1618                          }
1619  
1620                          if ($SynchErrorsFound > 0) {
1621                              $this->warning('Found '.$SynchErrorsFound.' synch errors in histogram analysis');
1622                              //return false;
1623                          }
1624  
1625                          $bittotal     = 0;
1626                          $framecounter = 0;
1627                          foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1628                              $framecounter += $bitratecount;
1629                              if ($bitratevalue != 'free') {
1630                                  $bittotal += ($bitratevalue * $bitratecount);
1631                              }
1632                          }
1633                          if ($framecounter == 0) {
1634                              $this->error('Corrupt MP3 file: framecounter == zero');
1635                              return false;
1636                          }
1637                          $info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
1638                          $info['mpeg']['audio']['bitrate']     = ($bittotal / $framecounter);
1639  
1640                          $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1641  
1642  
1643                          // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1644                          $distinct_bitrates = 0;
1645                          foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
1646                              if ($bitrate_count > 0) {
1647                                  $distinct_bitrates++;
1648                              }
1649                          }
1650                          if ($distinct_bitrates > 1) {
1651                              $info['mpeg']['audio']['bitrate_mode'] = 'vbr';
1652                          } else {
1653                              $info['mpeg']['audio']['bitrate_mode'] = 'cbr';
1654                          }
1655                          $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1656  
1657                      }
1658  
1659                      break; // exit while()
1660                  }
1661              }
1662  
1663              $SynchSeekOffset++;
1664              if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
1665                  // end of file/data
1666  
1667                  if (empty($info['mpeg']['audio'])) {
1668  
1669                      $this->error('could not find valid MPEG synch before end of file');
1670                      if (isset($info['audio']['bitrate'])) {
1671                          unset($info['audio']['bitrate']);
1672                      }
1673                      if (isset($info['mpeg']['audio'])) {
1674                          unset($info['mpeg']['audio']);
1675                      }
1676                      if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
1677                          unset($info['mpeg']);
1678                      }
1679                      return false;
1680  
1681                  }
1682                  break;
1683              }
1684  
1685          }
1686          $info['audio']['channels']        = $info['mpeg']['audio']['channels'];
1687          $info['audio']['channelmode']     = $info['mpeg']['audio']['channelmode'];
1688          $info['audio']['sample_rate']     = $info['mpeg']['audio']['sample_rate'];
1689          return true;
1690      }
1691  
1692      /**
1693       * @return array
1694       */
1695  	public static function MPEGaudioVersionArray() {
1696          static $MPEGaudioVersion = array('2.5', false, '2', '1');
1697          return $MPEGaudioVersion;
1698      }
1699  
1700      /**
1701       * @return array
1702       */
1703  	public static function MPEGaudioLayerArray() {
1704          static $MPEGaudioLayer = array(false, 3, 2, 1);
1705          return $MPEGaudioLayer;
1706      }
1707  
1708      /**
1709       * @return array
1710       */
1711  	public static function MPEGaudioBitrateArray() {
1712          static $MPEGaudioBitrate;
1713          if (empty($MPEGaudioBitrate)) {
1714              $MPEGaudioBitrate = array (
1715                  '1'  =>  array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1716                                  2 => array('free', 32000, 48000, 56000,  64000,  80000,  96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1717                                  3 => array('free', 32000, 40000, 48000,  56000,  64000,  80000,  96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1718                                 ),
1719  
1720                  '2'  =>  array (1 => array('free', 32000, 48000, 56000,  64000,  80000,  96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1721                                  2 => array('free',  8000, 16000, 24000,  32000,  40000,  48000,  56000,  64000,  80000,  96000, 112000, 128000, 144000, 160000),
1722                                 )
1723              );
1724              $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1725              $MPEGaudioBitrate['2.5']  = $MPEGaudioBitrate['2'];
1726          }
1727          return $MPEGaudioBitrate;
1728      }
1729  
1730      /**
1731       * @return array
1732       */
1733  	public static function MPEGaudioFrequencyArray() {
1734          static $MPEGaudioFrequency;
1735          if (empty($MPEGaudioFrequency)) {
1736              $MPEGaudioFrequency = array (
1737                  '1'   => array(44100, 48000, 32000),
1738                  '2'   => array(22050, 24000, 16000),
1739                  '2.5' => array(11025, 12000,  8000)
1740              );
1741          }
1742          return $MPEGaudioFrequency;
1743      }
1744  
1745      /**
1746       * @return array
1747       */
1748  	public static function MPEGaudioChannelModeArray() {
1749          static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1750          return $MPEGaudioChannelMode;
1751      }
1752  
1753      /**
1754       * @return array
1755       */
1756  	public static function MPEGaudioModeExtensionArray() {
1757          static $MPEGaudioModeExtension;
1758          if (empty($MPEGaudioModeExtension)) {
1759              $MPEGaudioModeExtension = array (
1760                  1 => array('4-31', '8-31', '12-31', '16-31'),
1761                  2 => array('4-31', '8-31', '12-31', '16-31'),
1762                  3 => array('', 'IS', 'MS', 'IS+MS')
1763              );
1764          }
1765          return $MPEGaudioModeExtension;
1766      }
1767  
1768      /**
1769       * @return array
1770       */
1771  	public static function MPEGaudioEmphasisArray() {
1772          static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1773          return $MPEGaudioEmphasis;
1774      }
1775  
1776      /**
1777       * @param string $head4
1778       * @param bool   $allowBitrate15
1779       *
1780       * @return bool
1781       */
1782  	public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
1783          return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
1784      }
1785  
1786      /**
1787       * @param array $rawarray
1788       * @param bool  $echoerrors
1789       * @param bool  $allowBitrate15
1790       *
1791       * @return bool
1792       */
1793  	public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
1794          if (!isset($rawarray['synch']) || ($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
1795              return false;
1796          }
1797  
1798          static $MPEGaudioVersionLookup;
1799          static $MPEGaudioLayerLookup;
1800          static $MPEGaudioBitrateLookup;
1801          static $MPEGaudioFrequencyLookup;
1802          static $MPEGaudioChannelModeLookup;
1803          static $MPEGaudioModeExtensionLookup;
1804          static $MPEGaudioEmphasisLookup;
1805          if (empty($MPEGaudioVersionLookup)) {
1806              $MPEGaudioVersionLookup       = self::MPEGaudioVersionArray();
1807              $MPEGaudioLayerLookup         = self::MPEGaudioLayerArray();
1808              $MPEGaudioBitrateLookup       = self::MPEGaudioBitrateArray();
1809              $MPEGaudioFrequencyLookup     = self::MPEGaudioFrequencyArray();
1810              $MPEGaudioChannelModeLookup   = self::MPEGaudioChannelModeArray();
1811              $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1812              $MPEGaudioEmphasisLookup      = self::MPEGaudioEmphasisArray();
1813          }
1814  
1815          if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1816              $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1817          } else {
1818              echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
1819              return false;
1820          }
1821          if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1822              $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1823          } else {
1824              echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
1825              return false;
1826          }
1827          if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
1828              echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
1829              if ($rawarray['bitrate'] == 15) {
1830                  // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1831                  // let it go through here otherwise file will not be identified
1832                  if (!$allowBitrate15) {
1833                      return false;
1834                  }
1835              } else {
1836                  return false;
1837              }
1838          }
1839          if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
1840              echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
1841              return false;
1842          }
1843          if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
1844              echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
1845              return false;
1846          }
1847          if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
1848              echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
1849              return false;
1850          }
1851          if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
1852              echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
1853              return false;
1854          }
1855          // These are just either set or not set, you can't mess that up :)
1856          // $rawarray['protection'];
1857          // $rawarray['padding'];
1858          // $rawarray['private'];
1859          // $rawarray['copyright'];
1860          // $rawarray['original'];
1861  
1862          return true;
1863      }
1864  
1865      /**
1866       * @param string $Header4Bytes
1867       *
1868       * @return array|false
1869       */
1870  	public static function MPEGaudioHeaderDecode($Header4Bytes) {
1871          // AAAA AAAA  AAAB BCCD  EEEE FFGH  IIJJ KLMM
1872          // A - Frame sync (all bits set)
1873          // B - MPEG Audio version ID
1874          // C - Layer description
1875          // D - Protection bit
1876          // E - Bitrate index
1877          // F - Sampling rate frequency index
1878          // G - Padding bit
1879          // H - Private bit
1880          // I - Channel Mode
1881          // J - Mode extension (Only if Joint stereo)
1882          // K - Copyright
1883          // L - Original
1884          // M - Emphasis
1885  
1886          if (strlen($Header4Bytes) != 4) {
1887              return false;
1888          }
1889  
1890          $MPEGrawHeader['synch']         = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
1891          $MPEGrawHeader['version']       = (ord($Header4Bytes[1]) & 0x18) >> 3; //    BB
1892          $MPEGrawHeader['layer']         = (ord($Header4Bytes[1]) & 0x06) >> 1; //      CC
1893          $MPEGrawHeader['protection']    = (ord($Header4Bytes[1]) & 0x01);      //        D
1894          $MPEGrawHeader['bitrate']       = (ord($Header4Bytes[2]) & 0xF0) >> 4; // EEEE
1895          $MPEGrawHeader['sample_rate']   = (ord($Header4Bytes[2]) & 0x0C) >> 2; //     FF
1896          $MPEGrawHeader['padding']       = (ord($Header4Bytes[2]) & 0x02) >> 1; //       G
1897          $MPEGrawHeader['private']       = (ord($Header4Bytes[2]) & 0x01);      //        H
1898          $MPEGrawHeader['channelmode']   = (ord($Header4Bytes[3]) & 0xC0) >> 6; // II
1899          $MPEGrawHeader['modeextension'] = (ord($Header4Bytes[3]) & 0x30) >> 4; //   JJ
1900          $MPEGrawHeader['copyright']     = (ord($Header4Bytes[3]) & 0x08) >> 3; //     K
1901          $MPEGrawHeader['original']      = (ord($Header4Bytes[3]) & 0x04) >> 2; //      L
1902          $MPEGrawHeader['emphasis']      = (ord($Header4Bytes[3]) & 0x03);      //       MM
1903  
1904          return $MPEGrawHeader;
1905      }
1906  
1907      /**
1908       * @param int|string $bitrate
1909       * @param string     $version
1910       * @param string     $layer
1911       * @param bool       $padding
1912       * @param int        $samplerate
1913       *
1914       * @return int|false
1915       */
1916  	public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) {
1917          static $AudioFrameLengthCache = array();
1918  
1919          if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
1920              $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
1921              if ($bitrate != 'free') {
1922  
1923                  if ($version == '1') {
1924  
1925                      if ($layer == '1') {
1926  
1927                          // For Layer I slot is 32 bits long
1928                          $FrameLengthCoefficient = 48;
1929                          $SlotLength = 4;
1930  
1931                      } else { // Layer 2 / 3
1932  
1933                          // for Layer 2 and Layer 3 slot is 8 bits long.
1934                          $FrameLengthCoefficient = 144;
1935                          $SlotLength = 1;
1936  
1937                      }
1938  
1939                  } else { // MPEG-2 / MPEG-2.5
1940  
1941                      if ($layer == '1') {
1942  
1943                          // For Layer I slot is 32 bits long
1944                          $FrameLengthCoefficient = 24;
1945                          $SlotLength = 4;
1946  
1947                      } elseif ($layer == '2') {
1948  
1949                          // for Layer 2 and Layer 3 slot is 8 bits long.
1950                          $FrameLengthCoefficient = 144;
1951                          $SlotLength = 1;
1952  
1953                      } else { // layer 3
1954  
1955                          // for Layer 2 and Layer 3 slot is 8 bits long.
1956                          $FrameLengthCoefficient = 72;
1957                          $SlotLength = 1;
1958  
1959                      }
1960  
1961                  }
1962  
1963                  // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
1964                  if ($samplerate > 0) {
1965                      $NewFramelength  = ($FrameLengthCoefficient * $bitrate) / $samplerate;
1966                      $NewFramelength  = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
1967                      if ($padding) {
1968                          $NewFramelength += $SlotLength;
1969                      }
1970                      $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
1971                  }
1972              }
1973          }
1974          return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
1975      }
1976  
1977      /**
1978       * @param float|int $bit_rate
1979       *
1980       * @return int|float|string
1981       */
1982  	public static function ClosestStandardMP3Bitrate($bit_rate) {
1983          static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
1984          static $bit_rate_table = array (0=>'-');
1985          $round_bit_rate = intval(round($bit_rate, -3));
1986          if (!isset($bit_rate_table[$round_bit_rate])) {
1987              if ($round_bit_rate > max($standard_bit_rates)) {
1988                  $bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate));
1989              } else {
1990                  $bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
1991                  foreach ($standard_bit_rates as $standard_bit_rate) {
1992                      if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
1993                          break;
1994                      }
1995                      $bit_rate_table[$round_bit_rate] = $standard_bit_rate;
1996                  }
1997              }
1998          }
1999          return $bit_rate_table[$round_bit_rate];
2000      }
2001  
2002      /**
2003       * @param string $version
2004       * @param string $channelmode
2005       *
2006       * @return int
2007       */
2008  	public static function XingVBRidOffset($version, $channelmode) {
2009          static $XingVBRidOffsetCache = array();
2010          if (empty($XingVBRidOffsetCache)) {
2011              $XingVBRidOffsetCache = array (
2012                  '1'   => array ('mono'          => 0x15, // 4 + 17 = 21
2013                                  'stereo'        => 0x24, // 4 + 32 = 36
2014                                  'joint stereo'  => 0x24,
2015                                  'dual channel'  => 0x24
2016                                 ),
2017  
2018                  '2'   => array ('mono'          => 0x0D, // 4 +  9 = 13
2019                                  'stereo'        => 0x15, // 4 + 17 = 21
2020                                  'joint stereo'  => 0x15,
2021                                  'dual channel'  => 0x15
2022                                 ),
2023  
2024                  '2.5' => array ('mono'          => 0x15,
2025                                  'stereo'        => 0x15,
2026                                  'joint stereo'  => 0x15,
2027                                  'dual channel'  => 0x15
2028                                 )
2029              );
2030          }
2031          return $XingVBRidOffsetCache[$version][$channelmode];
2032      }
2033  
2034      /**
2035       * @param int $VBRmethodID
2036       *
2037       * @return string
2038       */
2039  	public static function LAMEvbrMethodLookup($VBRmethodID) {
2040          static $LAMEvbrMethodLookup = array(
2041              0x00 => 'unknown',
2042              0x01 => 'cbr',
2043              0x02 => 'abr',
2044              0x03 => 'vbr-old / vbr-rh',
2045              0x04 => 'vbr-new / vbr-mtrh',
2046              0x05 => 'vbr-mt',
2047              0x06 => 'vbr (full vbr method 4)',
2048              0x08 => 'cbr (constant bitrate 2 pass)',
2049              0x09 => 'abr (2 pass)',
2050              0x0F => 'reserved'
2051          );
2052          return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
2053      }
2054  
2055      /**
2056       * @param int $StereoModeID
2057       *
2058       * @return string
2059       */
2060  	public static function LAMEmiscStereoModeLookup($StereoModeID) {
2061          static $LAMEmiscStereoModeLookup = array(
2062              0 => 'mono',
2063              1 => 'stereo',
2064              2 => 'dual mono',
2065              3 => 'joint stereo',
2066              4 => 'forced stereo',
2067              5 => 'auto',
2068              6 => 'intensity stereo',
2069              7 => 'other'
2070          );
2071          return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
2072      }
2073  
2074      /**
2075       * @param int $SourceSampleFrequencyID
2076       *
2077       * @return string
2078       */
2079  	public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
2080          static $LAMEmiscSourceSampleFrequencyLookup = array(
2081              0 => '<= 32 kHz',
2082              1 => '44.1 kHz',
2083              2 => '48 kHz',
2084              3 => '> 48kHz'
2085          );
2086          return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
2087      }
2088  
2089      /**
2090       * @param int $SurroundInfoID
2091       *
2092       * @return string
2093       */
2094  	public static function LAMEsurroundInfoLookup($SurroundInfoID) {
2095          static $LAMEsurroundInfoLookup = array(
2096              0 => 'no surround info',
2097              1 => 'DPL encoding',
2098              2 => 'DPL2 encoding',
2099              3 => 'Ambisonic encoding'
2100          );
2101          return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
2102      }
2103  
2104      /**
2105       * @param array $LAMEtag
2106       *
2107       * @return string
2108       */
2109  	public static function LAMEpresetUsedLookup($LAMEtag) {
2110  
2111          if ($LAMEtag['preset_used_id'] == 0) {
2112              // no preset used (LAME >=3.93)
2113              // no preset recorded (LAME <3.93)
2114              return '';
2115          }
2116          $LAMEpresetUsedLookup = array();
2117  
2118          /////  THIS PART CANNOT BE STATIC .
2119          for ($i = 8; $i <= 320; $i++) {
2120              switch ($LAMEtag['vbr_method']) {
2121                  case 'cbr':
2122                      $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
2123                      break;
2124                  case 'abr':
2125                  default: // other VBR modes shouldn't be here(?)
2126                      $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
2127                      break;
2128              }
2129          }
2130  
2131          // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
2132  
2133          // named alt-presets
2134          $LAMEpresetUsedLookup[1000] = '--r3mix';
2135          $LAMEpresetUsedLookup[1001] = '--alt-preset standard';
2136          $LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
2137          $LAMEpresetUsedLookup[1003] = '--alt-preset insane';
2138          $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
2139          $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
2140          $LAMEpresetUsedLookup[1006] = '--alt-preset medium';
2141          $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
2142  
2143          // LAME 3.94 additions/changes
2144          $LAMEpresetUsedLookup[1010] = '--preset portable';                                                           // 3.94a15 Oct 21 2003
2145          $LAMEpresetUsedLookup[1015] = '--preset radio';                                                              // 3.94a15 Oct 21 2003
2146  
2147          $LAMEpresetUsedLookup[320]  = '--preset insane';                                                             // 3.94a15 Nov 12 2003
2148          $LAMEpresetUsedLookup[410]  = '-V9';
2149          $LAMEpresetUsedLookup[420]  = '-V8';
2150          $LAMEpresetUsedLookup[440]  = '-V6';
2151          $LAMEpresetUsedLookup[430]  = '--preset radio';                                                              // 3.94a15 Nov 12 2003
2152          $LAMEpresetUsedLookup[450]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable';  // 3.94a15 Nov 12 2003
2153          $LAMEpresetUsedLookup[460]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium';    // 3.94a15 Nov 12 2003
2154          $LAMEpresetUsedLookup[470]  = '--r3mix';                                                                     // 3.94b1  Dec 18 2003
2155          $LAMEpresetUsedLookup[480]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard';  // 3.94a15 Nov 12 2003
2156          $LAMEpresetUsedLookup[490]  = '-V1';
2157          $LAMEpresetUsedLookup[500]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme';   // 3.94a15 Nov 12 2003
2158  
2159          return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
2160      }
2161  
2162  }


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