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   1  <?php
   2  /////////////////////////////////////////////////////////////////
   3  /// getID3() by James Heinrich <info@getid3.org>               //
   4  //  available at http://getid3.sourceforge.net                 //
   5  //            or http://www.getid3.org                         //
   6  /////////////////////////////////////////////////////////////////
   7  // See readme.txt for more details                             //
   8  /////////////////////////////////////////////////////////////////
   9  //                                                             //
  10  // module.audio.shorten.php                                    //
  11  // module for analyzing Shorten Audio files                    //
  12  // dependencies: NONE                                          //
  13  //                                                            ///
  14  /////////////////////////////////////////////////////////////////
  15  
  16  
  17  class getid3_shorten
  18  {
  19  
  20  	function getid3_shorten(&$fd, &$ThisFileInfo) {
  21  
  22          fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
  23  
  24          $ShortenHeader = fread($fd, 8);
  25          if (substr($ShortenHeader, 0, 4) != 'ajkg') {
  26              $ThisFileInfo['error'][] = 'Expecting "ajkg" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($ShortenHeader, 0, 4).'"';
  27              return false;
  28          }
  29          $ThisFileInfo['fileformat']            = 'shn';
  30          $ThisFileInfo['audio']['dataformat']   = 'shn';
  31          $ThisFileInfo['audio']['lossless']     = true;
  32          $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
  33  
  34          $ThisFileInfo['shn']['version'] = getid3_lib::LittleEndian2Int(substr($ShortenHeader, 4, 1));
  35  
  36          fseek($fd, $ThisFileInfo['avdataend'] - 12, SEEK_SET);
  37          $SeekTableSignatureTest = fread($fd, 12);
  38          $ThisFileInfo['shn']['seektable']['present'] = (bool) (substr($SeekTableSignatureTest, 4, 8) == 'SHNAMPSK');
  39          if ($ThisFileInfo['shn']['seektable']['present']) {
  40              $ThisFileInfo['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($SeekTableSignatureTest, 0, 4));
  41              $ThisFileInfo['shn']['seektable']['offset'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['shn']['seektable']['length'];
  42              fseek($fd, $ThisFileInfo['shn']['seektable']['offset'], SEEK_SET);
  43              $SeekTableMagic = fread($fd, 4);
  44              if ($SeekTableMagic != 'SEEK') {
  45  
  46                  $ThisFileInfo['error'][] = 'Expecting "SEEK" at offset '.$ThisFileInfo['shn']['seektable']['offset'].', found "'.$SeekTableMagic.'"';
  47                  return false;
  48  
  49              } else {
  50  
  51                  // typedef struct tag_TSeekEntry
  52                  // {
  53                  //   unsigned long SampleNumber;
  54                  //   unsigned long SHNFileByteOffset;
  55                  //   unsigned long SHNLastBufferReadPosition;
  56                  //   unsigned short SHNByteGet;
  57                  //   unsigned short SHNBufferOffset;
  58                  //   unsigned short SHNFileBitOffset;
  59                  //   unsigned long SHNGBuffer;
  60                  //   unsigned short SHNBitShift;
  61                  //   long CBuf0[3];
  62                  //   long CBuf1[3];
  63                  //   long Offset0[4];
  64                  //   long Offset1[4];
  65                  // }TSeekEntry;
  66  
  67                  $SeekTableData = fread($fd, $ThisFileInfo['shn']['seektable']['length'] - 16);
  68                  $ThisFileInfo['shn']['seektable']['entry_count'] = floor(strlen($SeekTableData) / 80);
  69                  //$ThisFileInfo['shn']['seektable']['entries'] = array();
  70                  //$SeekTableOffset = 0;
  71                  //for ($i = 0; $i < $ThisFileInfo['shn']['seektable']['entry_count']; $i++) {
  72                  //    $SeekTableEntry['sample_number'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  73                  //    $SeekTableOffset += 4;
  74                  //    $SeekTableEntry['shn_file_byte_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  75                  //    $SeekTableOffset += 4;
  76                  //    $SeekTableEntry['shn_last_buffer_read_position'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  77                  //    $SeekTableOffset += 4;
  78                  //    $SeekTableEntry['shn_byte_get'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
  79                  //    $SeekTableOffset += 2;
  80                  //    $SeekTableEntry['shn_buffer_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
  81                  //    $SeekTableOffset += 2;
  82                  //    $SeekTableEntry['shn_file_bit_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
  83                  //    $SeekTableOffset += 2;
  84                  //    $SeekTableEntry['shn_gbuffer'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  85                  //    $SeekTableOffset += 4;
  86                  //    $SeekTableEntry['shn_bit_shift'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
  87                  //    $SeekTableOffset += 2;
  88                  //    for ($j = 0; $j < 3; $j++) {
  89                  //        $SeekTableEntry['cbuf0'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  90                  //        $SeekTableOffset += 4;
  91                  //    }
  92                  //    for ($j = 0; $j < 3; $j++) {
  93                  //        $SeekTableEntry['cbuf1'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  94                  //        $SeekTableOffset += 4;
  95                  //    }
  96                  //    for ($j = 0; $j < 4; $j++) {
  97                  //        $SeekTableEntry['offset0'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  98                  //        $SeekTableOffset += 4;
  99                  //    }
 100                  //    for ($j = 0; $j < 4; $j++) {
 101                  //        $SeekTableEntry['offset1'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
 102                  //        $SeekTableOffset += 4;
 103                  //    }
 104                  //
 105                  //    $ThisFileInfo['shn']['seektable']['entries'][] = $SeekTableEntry;
 106                  //}
 107  
 108              }
 109  
 110          }
 111  
 112          if ((bool) ini_get('safe_mode')) {
 113              $ThisFileInfo['error'][] = 'PHP running in Safe Mode - backtick operator not available, cannot run shntool to analyze Shorten files';
 114              return false;
 115          }
 116  
 117          if (GETID3_OS_ISWINDOWS) {
 118  
 119              $RequiredFiles = array('shorten.exe', 'cygwin1.dll', 'head.exe');
 120              foreach ($RequiredFiles as $required_file) {
 121                  if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 122                      $ThisFileInfo['error'][] = GETID3_HELPERAPPSDIR.$required_file.' does not exist';
 123                      return false;
 124                  }
 125              }
 126              $commandline = GETID3_HELPERAPPSDIR.'shorten.exe -x "'.$ThisFileInfo['filenamepath'].'" - | '.GETID3_HELPERAPPSDIR.'head.exe -c 64';
 127              $commandline = str_replace('/', '\\', $commandline);
 128  
 129          } else {
 130  
 131              static $shorten_present;
 132              if (!isset($shorten_present)) {
 133                  $shorten_present = file_exists('/usr/local/bin/shorten') || `which shorten`;
 134              }
 135              if (!$shorten_present) {
 136                  $ThisFileInfo['error'][] = 'shorten binary was not found in path or /usr/local/bin';
 137                  return false;
 138              }
 139              $commandline = (file_exists('/usr/local/bin/shorten') ? '/usr/local/bin/' : '' ) . 'shorten -x '.escapeshellarg($ThisFileInfo['filenamepath']).' - | head -c 64';
 140  
 141          }
 142  
 143          $output = `$commandline`;
 144  
 145          if (!empty($output) && (substr($output, 12, 4) == 'fmt ')) {
 146  
 147              getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
 148  
 149              $fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4));
 150              $DecodedWAVFORMATEX = getid3_riff::RIFFparseWAVEFORMATex(substr($output, 20, $fmt_size));
 151              $ThisFileInfo['audio']['channels']        = $DecodedWAVFORMATEX['channels'];
 152              $ThisFileInfo['audio']['bits_per_sample'] = $DecodedWAVFORMATEX['bits_per_sample'];
 153              $ThisFileInfo['audio']['sample_rate']     = $DecodedWAVFORMATEX['sample_rate'];
 154  
 155              if (substr($output, 20 + $fmt_size, 4) == 'data') {
 156  
 157                  $ThisFileInfo['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $DecodedWAVFORMATEX['raw']['nAvgBytesPerSec'];
 158  
 159              } else {
 160  
 161                  $ThisFileInfo['error'][] = 'shorten failed to decode DATA chunk to expected location, cannot determine playtime';
 162                  return false;
 163  
 164              }
 165  
 166              $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $ThisFileInfo['playtime_seconds']) * 8;
 167  
 168          } else {
 169  
 170              $ThisFileInfo['error'][] = 'shorten failed to decode file to WAV for parsing';
 171              return false;
 172  
 173          }
 174  
 175          return true;
 176      }
 177  
 178  }
 179  
 180  ?>