public function doUpload()
 {
     $id = $_POST['id'];
     $duration = $_POST['duration'];
     $sn = $_POST['sn'];
     $isLast = $_POST['last'];
     $mysql = new DbMysql();
     $dashfile = new DashFile($id, $sn);
     $convert = new Convert($dashfile);
     if ($isLast == 1) {
         if (!$mysql->connect()) {
             return "ERROR: Sql server connect error!\n";
         }
         if (!$mysql->updateStatus($id, '1')) {
             return "ERROR: Sql INSERT error\n";
         }
         $segCount = $mysql->geSgmsCount($id);
         $dpl = new DashPlaylist($dashfile);
         $dpl->generateMPD($duration, 0, $segCount);
         $dpl->generateM3U8($segCount);
         $mysql->close();
     } else {
         if (!$dashfile->isValid()) {
             return "ERROR: File is invalid!\n";
         }
         if ($dashfile->saveFile()) {
             if (!$mysql->connect()) {
                 return "ERROR: Sql server connect error!\n";
             }
             if ($sn == 0) {
                 $mysql->insertNewVideo($id, $sn, $id, $duration);
             } else {
                 $mysql->updateNumSegs($id, $sn);
             }
             $mysql->close();
         } else {
             return "ERROR: File save error!\n";
         }
         if ($convert->doConvert()) {
             if (!$mysql->connect()) {
                 return "ERROR: Sql server connect error!\n";
             }
             if (!$mysql->updateNumConverted($id, $sn)) {
                 return "ERROR: Sql UPDATE error\n";
             }
             $mysql->close();
         }
         $start = $sn - 1;
         //if ($sn >= 3) {
         //    $start = $sn - 2;
         //}
         $dpl = new DashPlaylist($dashfile);
         $dpl->generateMPD($duration, $start, $sn);
     }
     return "SUCCESS";
 }