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CrossValidation.php
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<?php
/* This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
function loadLeafInfoFile($fileName, $PresTimeOffset){
global $session_dir;
$info = array();
$leafInfoFile = open_file($session_dir . '/' . $fileName, 'rt');
if (!$leafInfoFile)
return;
fscanf($leafInfoFile, "%lu\n", $accessUnitDurationNonIndexedTrack);
fscanf($leafInfoFile, "%u\n", $info['numTracks']);
$info['leafInfo'] = array();
$info['numLeafs'] = array();
$info['trackTypeInfo'] = array();
for ($i = 0; $i < $info['numTracks']; $i++)
fscanf($leafInfoFile, "%lu %lu\n", $info['trackTypeInfo'][$i]['track_ID'], $info['trackTypeInfo'][$i]['componentSubType']);
for ($i = 0; $i < $info['numTracks']; $i++){
fscanf($leafInfoFile, "%u\n", $info['numLeafs'][$i]);
$info['leafInfo'][$i] = array();
for ($j = 0; $j < $info['numLeafs'][$i]; $j++){
fscanf($leafInfoFile, "%d %f %f\n", $info['leafInfo'][$i][$j]['firstInSegment'], $info['leafInfo'][$i][$j]['earliestPresentationTime'], $info['leafInfo'][$i][$j]['lastPresentationTime']);
$info['leafInfo'][$i][$j]['earliestPresentationTime'] = $info['leafInfo'][$i][$j]['earliestPresentationTime'] - $PresTimeOffset;
$info['leafInfo'][$i][$j]['lastPresentationTime'] = $info['leafInfo'][$i][$j]['lastPresentationTime'] - $PresTimeOffset;
}
}
close_file($leafInfoFile);
return $info;
}
function checkAlignment($leafInfoA, $leafInfoB, $opfile, $segmentAlignment, $subsegmentAlignment, $bitstreamSwitching){
if ($leafInfoA['numTracks'] != $leafInfoB['numTracks']){
fprintf($opfile, "Error: Number of tracks logged %d for representation with id \"%s\" not equal to the number of indexed tracks %d for representation id \"%s\"\n", $leafInfoA['numTracks'], $leafInfoA['id'], $leafInfoB['numTracks'], $leafInfoB['id']);
if ($bitstreamSwitching == "true")
fprintf($opfile, "Bitstream switching not possible, validation failed for bitstreamSwitching\n");
return;
}
if ($bitstreamSwitching == "true"){
for ($i = 0; $i < $leafInfoA['numTracks']; $i++){
$correspondingTrackFound = false;
for ($j = 0; $j < $leafInfoB['numTracks']; $j++){
if ($leafInfoA['trackTypeInfo'][$i]['track_ID'] == $leafInfoB['trackTypeInfo'][$j]['track_ID'] && $leafInfoA['trackTypeInfo'][$i]['componentSubType'] == $leafInfoB['trackTypeInfo'][$j]['componentSubType']){
$correspondingTrackFound = true;
break;
}
}
if (!$correspondingTrackFound)
fprintf($opfile, "Error: No corresponding track found in representation id \"%s\" for representation id \"%s\" track ID \"%s\" with type \"%s\", bitstream switching is not possible: Section 7.3.3.2. of ISO/IEC 23009-1:2012(E): The track IDs for the same media content component are identical for each Representation in each Adaptation Set \n", $leafInfoB['id'], $leafInfoA['id'], $leafInfoA['trackTypeInfo'][$i]['track_ID'], $leafInfoA['trackTypeInfo'][$i]['componentSubType']);
}
}
if ($segmentAlignment != "true" && $subsegmentAlignment != "true")
return;
for ($i = 0; $i < $leafInfoA['numTracks']; $i++){
if ($leafInfoA['numLeafs'][$i] != $leafInfoB['numLeafs'][$i]){
fprintf($opfile, "Error: Number of leafs %d for track %d for representation id \"%s\" not equal to the number of leafs %d for track %d for representation id \"%s\"\n", $leafInfoA['numLeafs'][$i], $i + 1, $leafInfoA['id'], $leafInfoB['numLeafs'][$i], $i + 1, $leafInfoB['id']);
continue;
}
for ($j = 0; $j < ($leafInfoA['numLeafs'][$i] - 1); $j++){
if ($subsegmentAlignment == "true" || ($leafInfoA['leafInfo'][$i][$j + 1]['firstInSegment'] > 0)){
if ($leafInfoA['leafInfo'][$i][$j + 1]['earliestPresentationTime'] <= $leafInfoB['leafInfo'][$i][$j]['lastPresentationTime']){
if ($leafInfoA['leafInfo'][$i][$j + 1]['firstInSegment'] > 0)
fprintf($opfile, "Error: Overlapping segment: EPT of leaf %f for leaf number %d for representation id \"%s\" is <= the latest presentation time %f corresponding leaf for representation id \"%s\"\n", $leafInfoA['leafInfo'][$i][$j + 1]['earliestPresentationTime'], $j + 2, $leafInfoA['id'], $leafInfoB['leafInfo'][$i][$j]['lastPresentationTime'], $leafInfoB['id']);
else
fprintf($opfile, "Error: Overlapping sub-segment: EPT of leaf %f for leaf number %d for representation id \"%s\" is <= the latest presentation time %f corresponding leaf for representation id \"%s\"\n", $leafInfoA['leafInfo'][$i][$j + 1]['earliestPresentationTime'], $j + 2, $leafInfoA['id'], $leafInfoB['leafInfo'][$i][$j]['lastPresentationTime'], $leafInfoB['id']);
}
if ($leafInfoB['leafInfo'][$i][$j + 1]['earliestPresentationTime'] <= $leafInfoA['leafInfo'][$i][$j]['lastPresentationTime']) {
if ($leafInfoB['leafInfo'][$i][$j + 1]['firstInSegment'] > 0)
fprintf($opfile, "Error: Overlapping segment: EPT of leaf %f for leaf number %d for representation id \"%s\" is <= the latest presentation time %f corresponding leaf for representation id \"%s\"\n", $leafInfoB['leafInfo'][$i][$j + 1]['earliestPresentationTime'], $j + 2, $leafInfoB['id'], $leafInfoA['leafInfo'][$i][$j]['lastPresentationTime'], $leafInfoA['id']);
else
fprintf($opfile, "Error: Overlapping sub-segment: EPT of leaf %f for leaf number %d for representation id \"%s\" is <= the latest presentation time %f corresponding leaf for representation id \"%s\"\n", $leafInfoB['leafInfo'][$i][$j + 1]['earliestPresentationTime'], $j + 2, $leafInfoB['id'], $leafInfoA['leafInfo'][$i][$j]['lastPresentationTime'], $leafInfoA['id']);
}
}
}
}
}
function crossRepresentationProcess(){
global $mpd_features, $current_period, $session_dir, $adaptation_set_error_log_template, $reprsentation_info_log_template, $string_info;
$adaptation_sets = $mpd_features['Period'][$current_period]['AdaptationSet'];
for ($i = 0; $i < sizeof($adaptation_sets); $i++){
$timeoffset = 0;
$timescale = 1;
$adaptation_set = $adaptation_sets[$i];
$file_path = str_replace('$AS$', $i, $adaptation_set_error_log_template) . '.txt';
$opfile = open_file($session_dir . '/Period' .$current_period.'/' . $file_path, 'w');
$segmentAlignment = ($adaptation_set['segmentAlignment']) ? $adaptation_set['segmentAlignment'] : 'false';
$subsegmentAlignment = ($adaptation_set['subsegmentAlignment']) ? $adaptation_set['subsegmentAlignment'] : 'false';
$bitstreamSwitching = ($adaptation_set['bitstreamSwitching']) ? $adaptation_set['bitstreamSwitching'] : 'false';
if ($segmentAlignment == "true" || $subsegmentAlignment == "true" || $bitstreamSwitching == "true"){
$leafInfo = array();
$representations = $adaptation_set['Representation'];
for ($j = 0; $j < sizeof($representations); $j++){
$timeoffset = 0;
$timescale = 1;
$representation = $representations[$j];
if (!empty($adaptation_set['SegmentTemplate']['timescale']))
$timescale = $adaptation_set['SegmentTemplate']['timescale'];
if (!empty($adaptation_set['SegmentTemplate']['presentationTimeOffset']))
$timeoffset = $adaptation_set['SegmentTemplate']['presentationTimeOffset'];
if (!empty($representation['SegmentTemplate']['timescale']))
$timescale = $representation['SegmentTemplate']['timescale'];
if (!empty($representation['SegmentTemplate']['presentationTimeOffset']))
$timeoffset = $representation['SegmentTemplate']['presentationTimeOffset'];
if (!empty($representation['presentationTimeOffset']))
$timeoffset = $representation['presentationTimeOffset'];
$offsetmod = $timeoffset / $timescale;
$leafInfo[$j] = loadLeafInfoFile('Period' . $current_period . '/' . str_replace(array('$AS$', '$R$'), array($i, $j), $reprsentation_info_log_template) . '.txt', $offsetmod);
$leafInfo[$j]['id'] = $representation['id'];
}
for ($j = 0; $j < sizeof($representations)-1; $j++){
for ($k = $j + 1; $k < sizeof($representations); $k++){
checkAlignment($leafInfo[$j], $leafInfo[$k], $opfile, $segmentAlignment, $subsegmentAlignment, $bitstreamSwitching);
}
}
}
close_file($opfile);
$temp_string = str_replace('$Template$', explode('.', $file_path)[0], $string_info);
file_put_contents($session_dir . '/Period' .$current_period.'/' . explode('.', $file_path)[0] . '.html', $temp_string);
print_console($session_dir . '/Period' .$current_period.'/' . $file_path, "Period " . ($current_period+1) . " Adaptation Set " . ($i+1) . " DASH Cross Validation Results");
}
}