function processAndSendMPD($OriginalMPD, $PatchedMPD, $DASHContent, $offsetToNow)
{
$micro_date = microtime();
$date_array = explode(" ", $micro_date);
$date_array[0] = round($date_array[0], 4);
$date = date("Y-m-d H:i:s", $date_array[1]);
//file_put_contents ( "timelog.txt" , "Tuned in:" . $date . $date_array[0] . " \r\n" , FILE_APPEND );
$AST_SEC = new DateTime('now', new DateTimeZone('UTC'));
/* initializer for availability start time */
$AST_SEC->setTimestamp($date_array[1]);
//Better use a single time than now above
//$AST_SEC->add(new DateInterval('PT1S'));
$AST_SEC_W3C = $AST_SEC->format(DATE_W3C);
preg_match('/\\.\\d*/', $date_array[0], $dateFracPart);
$extension_pos = strrpos($AST_SEC_W3C, '+');
// find position of the last + in W3C date to slip frac seconds
$AST_W3C = substr($AST_SEC_W3C, 0, $extension_pos) . $dateFracPart[0] . "Z";
//substr($AST_SEC_W3C, $extension_pos);
//file_put_contents ( "timelog.txt" , "Setting AST: " . $AST_W3C . " \r\n" , FILE_APPEND );
$ASTO_SEC = new DateTime('now', new DateTimeZone('UTC'));
/* initializer for availability start time */
$ASTO_SEC->setTimestamp($date_array[1] - $offsetToNow);
//Better use a single time than now above
$ASTO_SEC_W3C = $ASTO_SEC->format(DATE_W3C);
$extension_pos = strrpos($ASTO_SEC_W3C, '+');
// find position of the last + in W3C date to slip frac seconds
$ASTO_W3C = substr($ASTO_SEC_W3C, 0, $extension_pos) . $dateFracPart[0] . "Z";
//substr($AST_SEC_W3C, $extension_pos);
$MPD = simplexml_load_file($DASHContent . "/" . $OriginalMPD);
if (!$MPD) {
die("Failed loading XML file");
}
$dom_sxe = dom_import_simplexml($MPD);
if (!$dom_sxe) {
echo 'Error while converting XML';
exit;
}
$dom = new DOMDocument('1.0');
$dom_sxe = $dom->importNode($dom_sxe, true);
$dom_sxe = $dom->appendChild($dom_sxe);
$periods = parseMPD($dom->documentElement);
$cumulativeUpdatedDuration = 0;
//Cumulation of period duration on updated MPD
$tuneInPeriodStart = 0;
$MPDNode =& $periods[0]['node']->parentNode;
$MPD_AST = $MPDNode->getAttribute("availabilityStartTime");
$MPD_AST = $ASTO_W3C;
//$MPDNode->getAttribute("availabilityStartTime");
preg_match('/\\.\\d*/', $MPD_AST, $matches);
$fracAST = "0" . $matches[0];
$originalAST = new DateTime($MPD_AST);
$deltaTimeASTTuneIn = $AST_SEC->getTimestamp() + round($date_array[0], 4) - ($originalAST->getTimestamp() + $fracAST);
//Time elapsed between the original AST and Tune-in time
//file_put_contents ( "timelog.txt" , "TimeOffset: " . $deltaTimeASTTuneIn . ", Original ts:" . ($originalAST->getTimestamp() + $fracAST) . "Tune-in TS: " . ($AST_SEC->getTimestamp() + round($date_array[0],4)) . "\r\n" , FILE_APPEND );
$MPDNode->setAttribute("availabilityStartTime", $AST_W3C);
//Set AST to tune-in time
$periodStart;
//Start of this period in the iteration
$duration;
//Duration of current period in the iteration
$lastPeriodStart;
//Period start of the last period in the iteration
$lastPeriodDuration;
//Period duration of the last period in iteration
$responseToSend[1] = count($periods) - 1;
for ($periodIndex = 0; $periodIndex < count($periods); $periodIndex++) {
$periodStart = $periods[$periodIndex]['node']->getAttribute("start");
$duration = somehowPleaseGetDurationInFractionalSecondsBecuasePHPHasABug($periods[$periodIndex]['node']->getAttribute("duration"));
if ($periodStart === '') {
$periodStart = $lastPeriodStart + $lastPeriodDuration;
} else {
$periodStart = somehowPleaseGetDurationInFractionalSecondsBecuasePHPHasABug($periodStart);
}
//Convert Duration string to number
//updateTemplate(&$periods[$periodIndex]['node']);
if ($deltaTimeASTTuneIn < $periodStart) {
$periods[$periodIndex]['node']->setAttribute("start", "PT" . round($lastPeriodStart + $lastPeriodDuration, 4) . "S");
//Set already for the next iteration
$lastPeriodStart = $lastPeriodStart + $lastPeriodDuration;
$responseToSend[] = $lastPeriodStart;
$lastPeriodDuration = $duration;
continue;
}
//Set already for the next iteration
$lastPeriodStart = $periodStart;
$lastPeriodDuration = $duration;
if ($deltaTimeASTTuneIn > $periodStart + $duration) {
$dom->documentElement->removeChild($periods[$periodIndex]['node']);
$responseToSend[1] = $responseToSend[1] - 1;
continue;
}
//The only case here is the period in which we tune in
$videoSegmentTemplate =& $periods[$periodIndex]['adaptationSet'][0]['representation'][0]['segmentTemplate']['node'];
$audioSegmentTemplate =& $periods[$periodIndex]['adaptationSet'][1]['representation'][0]['segmentTemplate']['node'];
$videoTimescale = $videoSegmentTemplate->getAttribute("timescale");
$videoSegmentDuration = $videoSegmentTemplate->getAttribute("duration");
$videoStartNum = $videoSegmentTemplate->getAttribute("startNumber");
$videoPTO = $videoSegmentTemplate->getAttribute("presentationTimeOffset");
$newVideoStartNumber = ceil(($deltaTimeASTTuneIn - $periodStart) * $videoTimescale / $videoSegmentDuration) + $videoStartNum;
//file_put_contents ( "timelog.txt" , "new video offset: " . ($deltaTimeASTTuneIn - $periodStart)*$videoTimescale/$videoSegmentDuration . "\r\n" , FILE_APPEND );
$videoOffsetUpdate = ($newVideoStartNumber - $videoStartNum) * $videoSegmentDuration / $videoTimescale;
$audioTimescale = $audioSegmentTemplate->getAttribute("timescale");
$audioSegmentDuration = $audioSegmentTemplate->getAttribute("duration");
$audioStartNum = $audioSegmentTemplate->getAttribute("startNumber");
$audioPTO = $audioSegmentTemplate->getAttribute("presentationTimeOffset");
$newAudioStartNumber = ceil(($deltaTimeASTTuneIn - $periodStart) * $audioTimescale / $audioSegmentDuration) + $audioStartNum;
//file_put_contents ( "timelog.txt" , "new audio offset: " . ($deltaTimeASTTuneIn - $periodStart)*$audioTimescale/$audioSegmentDuration . "\r\n" , FILE_APPEND );
$audioOffsetUpdate = ($newAudioStartNumber - $audioStartNum) * $audioSegmentDuration / $audioTimescale;
// Find the smaller update offset of audio and video, set the other to the smaller
$offsetUpdate = min($videoOffsetUpdate, $audioOffsetUpdate);
$newAudioPTO = round($offsetUpdate * $audioTimescale + $audioPTO);
//Round, since PTO is int type
$newVideoPTO = round($offsetUpdate * $videoTimescale + $videoPTO);
//Round, since PTO is int type
//The adjusted period start and duration governed by new audio/video offset above.
$periods[$periodIndex]['node']->setAttribute("start", "PT" . round($offsetUpdate + $periodStart - $deltaTimeASTTuneIn, 4) . "S");
$remainingPeriodDuration = $duration - max($videoOffsetUpdate, $audioOffsetUpdate);
$periods[$periodIndex]['node']->setAttribute("duration", "PT" . round($remainingPeriodDuration, 4) . "S");
//Update again the last saved values for the next iteration
$lastPeriodStart = $offsetUpdate + $periodStart - $deltaTimeASTTuneIn;
$lastPeriodDuration = $remainingPeriodDuration;
$videoSegmentTemplate->setAttribute("presentationTimeOffset", $newVideoPTO);
$videoSegmentTemplate->setAttribute("startNumber", $newVideoStartNumber);
$audioSegmentTemplate->setAttribute("presentationTimeOffset", $newAudioPTO);
$audioSegmentTemplate->setAttribute("startNumber", $newAudioStartNumber);
//$periods[$periodIndex]['node']->removeChild ($periods[$periodIndex]['adaptationSet'][1]['node']);
}
//Set the updated MPD duration
$MPDNode->setAttribute("mediaPresentationDuration", "PT" . round($lastPeriodStart + $lastPeriodDuration, 4) . "S");
/*if($AdSource == 1 && count($periods) >= 2)
{
$BaseURL = $dom->createElement( "BaseURL", "../Ad2/");
$TargetPeriod = $periods[count($periods) - 2];
$TargetAS = $TargetPeriod['adaptationSet'][0]['node'];
$TargetPeriodNode = $TargetPeriod['node'];
$TargetPeriodNode->insertBefore($BaseURL,$TargetAS);
}*/
$BaseURL = $dom->createElement("BaseURL", $DASHContent);
$TargetPeriodNode = $periods[0]['node'];
$MPDNode->insertBefore($BaseURL, $TargetPeriodNode);
$dom->save($PatchedMPD);
corsHeader();
header("Content-Type: application/xml");
$toecho = $dom->saveXML();
echo $toecho;
#file_put_contents ( "timelog.txt" , $latestFiles , FILE_APPEND );
$micro_date = microtime();
$date_array = explode(" ", $micro_date);
$date = date("Y-m-d H:i:s", $date_array[1]);
//file_put_contents ( "timelog.txt" , "Done:" . $date . $date_array[0] . " \r\n" , FILE_APPEND );
}
}
//Set the updated MPD duration
$MPDNode->setAttribute("mediaPresentationDuration", "PT" . round($lastPeriodStart + $lastPeriodDuration, 4) . "S");
/*if($AdSource == 1 && count($periods) >= 2)
{
$BaseURL = $dom->createElement( "BaseURL", "../Ad2/");
$TargetPeriod = $periods[count($periods) - 2];
$TargetAS = $TargetPeriod['adaptationSet'][0]['node'];
$TargetPeriodNode = $TargetPeriod['node'];
$TargetPeriodNode->insertBefore($BaseURL,$TargetAS);
}*/
$BaseURL = $dom->createElement("BaseURL", $DASHContent);
$TargetPeriodNode = $periods[0]['node'];
//$MPDNode->insertBefore($BaseURL,$TargetPeriodNode);
$dom->save($PatchedMPD);
corsHeader();
header("Content-Type: application/xml");
$toecho = $dom->saveXML();
$timestampinms = $date_array[1] * 1000 + $date_array[0];
exec("python timer.py " . $newVideoStartNumber . " " . $newAudioStartNumber . " " . $videoSegmentDuration * 1000 / $videoTimescale . " " . $audioSegmentDuration * 1000 / $audioTimescale . " " . $timestampinms . " " . $DASHContent . " " . $cacheDir . " > pythonlog.txt &");
while (!file_exists($cacheDir . '/initialized.trig')) {
usleep(1000);
}
echo $toecho;
#file_put_contents ( "timelog.txt" , $latestFiles , FILE_APPEND );
$micro_date = microtime();
$date_array = explode(" ", $micro_date);
$date = date("Y-m-d H:i:s", $date_array[1]);
//file_put_contents ( "timelog.txt" , "Done:" . $date . $date_array[0] . " \r\n" , FILE_APPEND );
exit;
function updateTemplate($period, $prefix)
