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HbbTV_DVB_RepresentationValidation.php
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HbbTV_DVB_RepresentationValidation.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 RepresentationValidation_HbbTV_DVB(){
global $hbbtv_conformance, $dvb_conformance, $session_dir, $mpd_dom,
$current_period, $current_adaptation_set, $current_representation,
$period_timing_info, $adaptation_set_template, $reprsentation_template,$subtitle_segments_location,
$reprsentation_error_log_template, $string_info, $progress_report, $progress_xml;
$rep_error_file = str_replace(array('$AS$', '$R$'), array($current_adaptation_set, $current_representation), $reprsentation_error_log_template);
if(!($opfile = open_file($session_dir.'/Period'.$current_period.'/'.$rep_error_file.'.txt', 'a'))){
echo "Error opening/creating HbbTV/DVB codec validation file: "."$session_dir.'/'.$rep_error_file".'.txt';
return;
}
## Representation checks
$adapt_dir = str_replace('$AS$', $current_adaptation_set, $adaptation_set_template);
$rep_dir = str_replace(array('$AS$', '$R$'), array($current_adaptation_set, $current_representation), $reprsentation_template);
$xml_rep = get_DOM($session_dir.'/Period'.$current_period.'/'.$adapt_dir.'/'.$rep_dir.'.xml', 'atomlist');
if($xml_rep){
if($dvb_conformance){
$media_types = media_types($mpd_dom->getElementsByTagName('Period')->item($current_period));
common_validation_DVB($opfile, $xml_rep, $media_types);
}
if($hbbtv_conformance){
common_validation_HbbTV($opfile, $xml_rep);
}
seg_timing_common($opfile, $xml_rep);
$bitrate_report_name = bitrate_report($xml_rep);
$segment_duration_name = seg_duration_checks($opfile);
if ($period_timing_info[1] !== '' && $period_timing_info[1] !== 0){
$checks = segmentToPeriodDurationCheck($xml_rep);
if(!$checks[0]){
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated: Section 'Periods' - The accumulated duration of the segments [".$checks[1]. "seconds] in the representation does not match the period duration[".$checks[2]."seconds].\n'");
}
}
}
## For reporting
$search = file_get_contents($session_dir . '/Period' . $current_period . '/' . $rep_error_file . '.txt'); //Search for errors within log file
if (strpos($search, "###") === false){
if(strpos($search, "Warning") === false && strpos($search, "WARNING") === false){
$progress_xml->Results[0]->Period[$current_period]->Adaptation[$current_adaptation_set]->Representation[$current_representation] = "noerror";
$file_location[] = "noerror";
}
else{
$progress_xml->Results[0]->Period[$current_period]->Adaptation[$current_adaptation_set]->Representation[$current_representation] = "warning";
$file_location[] = "warning";
}
}
else{
$progress_xml->Results[0]->Period[$current_period]->Adaptation[$current_adaptation_set]->Representation[$current_representation] = "error";
$file_location[] = "error";
}
$progress_xml->asXml(trim($session_dir . '/' . $progress_report));
add_remove_images('REMOVE');
$hbbtv_string_info = "<img id=\"segmentReport\" src=\"$segment_duration_name\" width=\"650\" height=\"350\">" .
"<img id=\"bitrateReport\" src=\"$bitrate_report_name\" width=\"650\" height=\"350\"/>\n";
add_remove_images('ADD', $hbbtv_string_info);
return $file_location;
}
function add_remove_images($request, $hbbtv_string_info=NULL) {
global $string_info;
if($request == 'ADD') {
$index = strpos($string_info, '</body>');
$string_info = substr($string_info, 0, $index) . $hbbtv_string_info .substr($string_info, $index);
}
elseif($request == 'REMOVE') {
$start_index = strpos($string_info, '<img');
$end_index = strpos($string_info, '>', $start_index);
while($start_index !== FALSE) {
$string_info = substr($string_info, 0, $start_index) . substr($string_info, $end_index+1);
$start_index = strpos($string_info, '<img');
}
}
}
function HbbTV_DVB_flags(){
global $additional_flags, $mpd_features, $hbbtv_conformance, $dvb_conformance,
$current_period, $current_adaptation_set, $current_representation;
$adapt = $mpd_features['Period'][$current_period]['AdaptationSet'][$current_adaptation_set];
$rep = $adapt['Representation'][$current_representation];
## General
$additional_flags .= ($hbbtv_conformance) ? ' -hbbtv' : '';
$additional_flags .= ($hbbtv_conformance) ? ' -isolive' : '';
$additional_flags .= ($dvb_conformance) ? ' -dvb' : '';
## Framerate checks
if($adapt['frameRate'] == NULL && $rep['frameRate'] == NULL)
$additional_flags .= ' -framerate 0';
else
$additional_flags .= ($adapt['frameRate'] == NULL) ? ' -framerate ' . $rep['frameRate'] : ' -framerate ' . $adapt['frameRate'];
## Codec checks
$codecs = ($adapt['codecs'] == NULL) ? $rep['codecs'] : $adapt['codecs'];
$codec_arr = explode('.', $codecs);
if((strpos($codecs, 'hev')!==FALSE || strpos($codecs, 'hvc')!==FALSE)) {
if(!empty($codec_arr[1]))
$additional_flags .= " -codecprofile " . $codec_arr[1];
if(!empty($codec_arr[3]))
$additional_flags .= " -codectier " . substr($codec_arr[3], 0, 1);
if(!empty($codec_arr[3]) && strlen($codec_arr[3]) > 1)
$additional_flags .= " -codeclevel " . substr($codec_arr[3], 1);
}
if(strpos($codecs, 'avc')!==FALSE){
if(!empty($codec_arr[1]) && strlen($codec_arr[1]) > 1)
$additional_flags .= " -codecprofile " . (string)hexdec(substr($codec_arr[1], 0, 2));
if(!empty($codec_arr[1]) && strlen($codec_arr[1]) == 6)
$additional_flags .= " -codeclevel " . (string)hexdec(substr($codec_arr[1], -2));
}
## Content protection checks
$content_protection_len = (!$adapt['ContentProtection']) ? sizeof($rep['ContentProtection']) : sizeof($adapt['ContentProtection']);
if($content_protection_len > 0)
$additional_flags .= ' -dash264enc';
}
function is_subtitle(){
global $mpd_features, $current_period, $current_adaptation_set, $current_representation,
$session_dir, $subtitle_segments_location;
$subtitle_rep = false;
$adapt = $mpd_features['Period'][$current_period]['AdaptationSet'][$current_adaptation_set];
$rep = $adapt['Representation'][$current_representation];
if(($adapt['mimeType'] == 'application/mp4' || $rep['mimeType'] == 'application/mp4') &&
($adapt['codecs'] == 'stpp' || $rep['codecs'] == 'stpp')){
$contType = $adapt['contentType'];
if($contType == ''){
if(sizeof($adapt['ContentComponent']) != 0){
$contComp = $adapt['ContentComponent'][0];
if($contComp['contentType'] == 'text')
$subtitle_rep = true;
}
else
$subtitle_rep = true;
}
elseif($contType == 'text')
$subtitle_rep = true;
}
if($subtitle_rep){
$subdir = str_replace(array('$AS$', '$R$'), array($current_adaptation_set, $current_representation), $subtitle_segments_location);
$subtitle_dir = $session_dir . '/Period' . $current_period . '/Adapt' . $current_adaptation_set . 'rep' . $current_representation . '/Subtitles/';//$subdir;
if (!file_exists($subtitle_dir)){
$oldmask = umask(0);
mkdir($subtitle_dir, 0777, true);
umask($oldmask);
}
}
return $subtitle_rep;
}
function common_validation_DVB($opfile, $xml_rep, $media_types){
global $session_dir, $mpd_features, $current_period, $current_adaptation_set, $current_representation, $profiles,
$sizearray, $reprsentation_template, $subtitle_segments_location;
$adapt = $mpd_features['Period'][$current_period]['AdaptationSet'][$current_adaptation_set];
$rep = $adapt['Representation'][$current_representation];
## Report on any resolutions used that are not in the tables of resoultions in 10.3 of the DVB DASH specification
$res_result = resolutionCheck($adapt, $rep);
if($res_result[0] == false)
fwrite ($opfile, "Information on HbbTV-DVB DASH Validation Requirements conformance for DVB: Section 'Codec information' - Resolution value \"" . $res_result[1] . 'x' . $res_result[2] . "\" is not in the table of resolutions in 10.3 of the DVB DASH specification.\n");
##
## Check on the support of the provided codec
// MPD part
$codecs = $adapt['codecs'];
if($codecs == ''){
$codecs = $rep['codecs'];
}
if($codecs != ''){
$codecs_arr = explode(',', $codecs);
$str_info = '';
foreach($codecs_arr as $codec){
if(strpos($codec, 'avc') === FALSE && strpos($codec, 'hev1') === FALSE && strpos($codec, 'hvc1') === FALSE &&
strpos($codec, 'mp4a') === FALSE && strpos($codec, 'ec-3') === FALSE && strpos($codec, 'ac-4') === FALSE &&
strpos($codec, 'dtsc') === FALSE && strpos($codec, 'dtsh') === FALSE && strpos($codec, 'dtse') === FALSE && strpos($codec, 'dtsl') === FALSE &&
strpos($codec, 'stpp') === FALSE){
$str_info .= "$codec ";
}
}
if($str_info != '')
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - @codecs in the MPD is not supported by the specification', found $str_info.\n");
}
// Segment part
$hdlr_type = $xml_rep->getElementsByTagName('hdlr')->item(0)->getAttribute('handler_type');
$sdType = $xml_rep->getElementsByTagName("$hdlr_type".'_sampledescription')->item(0)->getAttribute('sdType');
if(strpos($sdType, 'avc') === FALSE && strpos($sdType, 'hev1') === FALSE && strpos($sdType, 'hvc1') === FALSE &&
strpos($sdType, 'mp4a') === FALSE && strpos($sdType, 'ec-3') === FALSE && strpos($sdType, 'ac-4') === FALSE &&
strpos($sdType, 'dtsc') === FALSE && strpos($sdType, 'dtsh') === FALSE && strpos($sdType, 'dtse') === FALSE && strpos($sdType, 'dtsl') === FALSE &&
strpos($sdType, 'stpp') === FALSE &&
strpos($sdType, 'enc') === FALSE)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - codec in the Segment is not supported by the specification', found $sdType.\n");
$original_format = '';
if(strpos($sdType, 'enc') !== FALSE){
$sinf_boxes = $xml_rep->getElementsByTagName('sinf');
if($sinf_boxes->length != 0){
$original_format = $sinf_boxes->item(0)->getElementsByTagName('frma')->item(0)->getAttribute('original_format');
}
}
if(strpos($sdType, 'avc') !== FALSE || strpos($original_format, 'avc') !== FALSE){
$nal_units = $xml_rep->getElementsByTagName('NALUnit');
foreach($nal_units as $nal_unit){
if($nal_unit->getAttribute('nal_type') == '0x07'){
if($nal_unit->getAttribute('profile_idc') != 100)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - profile used for the AVC codec in Segment is not supported by the specification Section 5.1.1', found " . $nal_unit->getAttribute('profile_idc') . ".\n");
$level_idc = $nal_unit->getElementsByTagName('comment')->item(0)->getAttribute('level_idc');
if($level_idc != 30 && $level_idc != 31 && $level_idc != 32 && $level_idc != 40)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - level used for the AVC codec in Segment is not supported by the specification Section 5.1.1', found $level_idc.\n");
}
}
}
elseif(strpos($sdType, 'hev1') !== FALSE || strpos($sdType, 'hvc1') !== FALSE || strpos($original_format, 'hev1') !== FALSE || strpos($original_format, 'hvc1') !== FALSE){
$width = $xml_rep->getElementsByTagName("$hdlr_type".'_sampledescription')->item(0)->getAttribute('width');
$height = $xml_rep->getElementsByTagName("$hdlr_type".'_sampledescription')->item(0)->getAttribute('height');
$nal_units = $xml_rep->getElementsByTagName('NALUnit');
foreach($nal_units as $nal_unit){
$nalUnitType = $nal_unit->parentNode->getAttribute('nalUnitType');
if($nalUnitType == '33'){
if($nal_unit->getAttribute('gen_tier_flag') != '0')
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - tier used for the HEVC codec in Segment is not supported by the specification Section 5.2.3', found " . $nal_unit->getAttribute('gen_tier_flag') . ".\n");
if($nal_unit->getAttribute('bit_depth_luma_minus8') != 0 && $nal_unit->getAttribute('bit_depth_luma_minus8') != 2)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - bit depth used for the HEVC codec in Segment is not supported by the specification Section 5.2.3', found " . $nal_unit->getAttribute('bit_depth_luma_minus8') . ".\n");
if((int)$width <= 1920 && (int)$height <= 1080){
if($nal_unit->getAttribute('gen_profile_idc') != '1' && $nal_unit->getAttribute('gen_profile_idc') != '2')
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - profile used for the HEVC codec in Segment is not supported by the specification Section 5.2.3', found " . $nal_unit->getAttribute('gen_profile_idc') . ".\n");
if((int)($nal_unit->getAttribute('sps_max_sub_layers_minus1')) == 0 && (int)($nal_unit->getAttribute('gen_level_idc')) > 123)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - level used for the HEVC codec in Segment is not supported by the specification Section 5.2.3', found " . $nal_unit->getAttribute('gen_level_idc') . ".\n");
}
elseif((int)$width > 1920 && (int)$height > 1080){
if($nal_unit->getAttribute('gen_profile_idc') != '2')
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - profile used for the HEVC codec in Segment is not supported by the specification Section 5.2.3', found " . $nal_unit->getAttribute('gen_profile_idc') . ".\n");
if((int)($nal_unit->getAttribute('sps_max_sub_layers_minus1')) == 0 && (int)($nal_unit->getAttribute('gen_level_idc')) > 153)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Codec information' - level used for the HEVC codec in Segment is not supported by the specification Section 5.2.3', found " . $nal_unit->getAttribute('gen_level_idc') . ".\n");
}
}
}
}
##
## Subtitle checks
if($adapt['mimeType'] == 'application/mp4' || $rep['mimeType'] == 'application/mp4'){
if($adapt['codecs'] == 'stpp' || $rep['codecs'] == 'stpp'){
if($hdlr_type != 'subt')
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Subtitles' - For subtitle media, handler type in the Initialization Segment SHALL be \"subt\"', found \"$hdlr_type\".\n");
$stpp = $xml_rep->getElementsByTagName('stpp');
if($stpp->length == 0)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Subtitles' - For subtitle media, sample entry type SHALL be \"stpp (XMLSubtitleSampleEntry)\"', stpp not found.\n");
else{
if($stpp->item(0)->getAttribute('namespace') == '')
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Subtitles' - For subtitle media, namespaces SHALL be listed in the sample entry', namespace not found.\n");
}
## EBU TECH 3381 - Section 5 - Layout check
if(in_array('video', $media_types)){
$tkhd = $xml_rep->getElementsByTagName('tkhd')->item(0);
if((int)($tkhd->getAttribute('width')) != 0 || (int)($tkhd->getAttribute('height')) != 0)
fwrite($opfile, "Warning for HbbTV-DVB DASH Validation Requirements check for DVB: Section 'Subtitles' - EBU TECH 3381 Section 5- When the subtitle track is associated with a video object the width and height of the subtitle track SHOULD NOT be set', found width and/or height value set.\n");
}
##
## Check the timing of segments and the EBU-TT-D files
// EBU-TT-D
$meta_str = '';
$subt_times = array();
$subtitle_loc = str_replace(array('$AS$', '$R$'), array($current_adaptation_set, $current_representation), $subtitle_segments_location);
$files = glob($session_dir.'/'.$subtitle_loc.'*');
natsort($files);
foreach($files as $file){
$file_loaded = simplexml_load_file($file);
if($file_loaded){
$dom_abs = dom_import_simplexml($file_loaded);
$abs = new DOMDocument('1.0');
$dom_abs = $abs->importNode($dom_abs, true);
$dom_abs = $abs->appendChild($dom_abs);
$abs = $abs->getElementsByTagName('subtitle')->item(0);
$tts = $abs = $abs->getElementsByTagName('tt');
$begin = '';
foreach($tts as $tt){
##Check if metadata present; if yes, check if the profile is other than EBU-TT-D
if($tt->getElementsByTagName('metadata')->length != 0){
$metadata_children = $tt->getElementsByTagName('metadata')->item(0)->childNodes;
foreach($metadata_children as $metadata_child){
if($metadata_child->nodeType == XML_ELEMENT_NODE){
if(strpos($metadata_child->nodeName, 'ebutt') === FALSE)
$meta_str .= 'no ';
}
}
}
##
$body = $tt->getElementsByTagName('body')->item(0);
$divs = $body->getElementsByTagName('div');
foreach($divs as $div){
$ps = $div->getElementsByTagName('p');
foreach($ps as $p){
$h_m_s_begin = $p->getAttribute('begin');
$h_m_s = explode(':', $h_m_s_begin);
$begin .= ' ' . (string)($h_m_s[0]*60*60 + $h_m_s[1]*60 + $h_m_s[2]);
}
}
}
$subt_times[] = $begin;
}
}
if($meta_str != '')
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Subtitles' - Subtitle segments do not contain ISO-BMFF packaged EBU-TT-D but some other profile.\n");
// Segments
$type = $mpd_features['type'];
$xml_num_moofs=$xml_rep->getElementsByTagName('moof')->length;
$xml_trun=$xml_rep->getElementsByTagName('trun');
$xml_tfdt=$xml_rep->getElementsByTagName('tfdt');
$sidx_boxes = $xml_rep->getElementsByTagName('sidx');
$subsegment_signaling = array();
if($sidx_boxes->length != 0){
foreach($sidx_boxes as $sidx_box){
$subsegment_signaling[] = (int)($sidx_box->getAttribute('referenceCount'));
}
}
$xml_elst = $xml_rep->getElementsByTagName('elst');
if($xml_elst->length == 0)
$mediaTime = 0;
else
$mediaTime = (int)($xml_elst->item(0)->getElementsByTagName('elstEntry')->item(0)->getAttribute('mediaTime'));
if($type != 'dynamic'){
$timescale=$xml_rep->getElementsByTagName('mdhd')->item(0)->getAttribute('timescale');
$sidx_index = 0;
$cum_subsegDur=0;
$s=0;
for($j=0;$j<$xml_num_moofs;$j++){
if(empty($subsegment_signaling)){
$cum_subsegDur += (($xml_trun->item($j)->getAttribute('cummulatedSampleDuration'))/$timescale);
$subt_begin = explode(' ', $subt_times[$j]);
for($be=1; $be<sizeof($subt_begin); $be++){
if($subt_begin[$be] > $cum_subsegDur)
fwrite($opfile, "Warning for HbbTV-DVB DASH Validation Requirements check for DVB: Section 'Subtitles' - 'For subtitle media, timing of subtitle $be with start \"" . $subt_begin[$be] . "\" lies completely outside the segment time period of the segment $j.\n");
}
}
else{
$ref_count = 1;
if($sidx_index < sizeof($subsegment_signaling))
$ref_count = $subsegment_signaling[$sidx_index];
$cum_subsegDur += (($xml_trun->item($j)->getAttribute('cummulatedSampleDuration'))/$timescale);
$subsegment_signaling[$sidx_index] = $ref_count - 1;
if($subsegment_signaling[$sidx_index] == 0){
while($s <= $j){
$subt_begin = explode(' ', $subt_times[$s]);
for($be=1; $be<sizeof($subt_begin); $be++){
if($subt_begin[$be] > $cum_subsegDur)
fwrite($opfile, "Warning for HbbTV-DVB DASH Validation Requirements check for DVB: Section 'Subtitles' - 'For subtitle media, timing of subtitle $s with start \"" . $subt_begin[$be] . "\" lies completely outside the segment time period of the segment.\n");
}
$s++;
}
$sidx_index++;
}
}
}
}
##
}
}
## Segment checks
$moof_boxes = $xml_rep->getElementsByTagName('moof');
// Section 4.3 on on-demand profile periods containing sidx boxes
if(strpos($profiles[$current_period][$current_period][$current_adaptation_set][$current_representation], 'urn:mpeg:dash:profile:isoff-on-demand:2011') !== FALSE || strpos($profiles[$current_adaptation_set][$current_representation], 'urn:dvb:dash:profile:dvb-dash:isoff-ext-on-demand:2014') !== FALSE){
if($xml_rep->getElementsByTagName('sidx')->length != 1)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for DVB: Section 'Segments' - 'Segment includes features that are not required by the profile being validated against', found ". $xml_rep->getElementsByTagName('sidx')->length ." sidx boxes while according to Section 4.3 \"(For On Demand profile) The segment SHALL contain only one single Segment Index box ('sidx) for the entire segment\"'.\n");
$seg_loc = str_replace(array('$AS$', '$R$'), array($current_adaptation_set, $current_representation), $reprsentation_template);
if(count(glob($session_dir.'/'.$seg_loc.'/*')) - count(glob($session_dir.'/'.$seg_loc.'/*', GLOB_ONLYDIR)) != 1)
fwrite($opfile, "###'DVB check violated: Section 4.3- (For On Demand profile) Each Representation SHALL have only one Segment', found more.\n");
}
// Section 4.3 on traf box count in moof boxes
foreach($moof_boxes as $moof_box){
if($moof_box->getElementsByTagName('traf')->length != 1)
fwrite($opfile, "###'DVB check violated: Section 4.3- The movie fragment box ('moof') SHALL contain only one track fragment box ('traf')', found more than one.\n");
}
// Section 4.5 on segment and subsegment durations
$sidx_boxes = $xml_rep->getElementsByTagName('sidx');
$subsegment_signaling = array();
if($sidx_boxes->length != 0){
foreach($sidx_boxes as $sidx_box){
$subsegment_signaling[] = (int)($sidx_box->getAttribute('referenceCount'));
}
}
$timescale=$xml_rep->getElementsByTagName('mdhd')->item(0)->getAttribute('timescale');
$num_moofs=$moof_boxes->length;
$sidx_index = 0;
$cum_subsegDur=0;
for($j=0;$j<$num_moofs-1;$j++){
$cummulatedSampleDuration=$xml_rep->getElementsByTagName('trun')->item($j)->getAttribute('cummulatedSampleDuration');
$segDur=$cummulatedSampleDuration/$timescale;
if(empty($subsegment_signaling) || (!empty($subsegment_signaling) && sizeof(array_unique($subsegment_signaling)) == 1 && in_array(0, $subsegment_signaling))){
if($hdlr_type =='vide' && $segDur>15)
fwrite($opfile, "###'DVB check violated Section 4.5: Where subsegments are not signalled, each video segment SHALL have a duration of not more than 15 seconds', segment ".($j+1)." found with duration ".$segDur." \n");
if($hdlr_type =='soun' && $segDur>15)
fwrite($opfile, "###'DVB check violated Section 4.5: Where subsegments are not signalled, each audio segment SHALL have a duration of not more than 15 seconds', segment ".($j+1)." found with duration ".$segDur." \n");
if($segDur <1)
fwrite($opfile, "###'DVB check violated Section 4.5: Segment duration SHALL be at least 1 second except for the last segment of a Period', segment ".($j+1)." found with duration ".$segDur." \n");
}
elseif(!empty($subsegment_signaling) && !in_array(0, $subsegment_signaling)){
$ref_count = $subsegment_signaling[$sidx_index];
$cum_subsegDur += $segDur;
if($hdlr_type =='vide' && $segDur>15)
fwrite($opfile, "###'DVB check violated Section 4.5: Each video subsegment SHALL have a duration of not more than 15 seconds', subsegment ".($j+1)." found with duration ".$segDur." \n");
if($hdlr_type =='soun' && $segDur>15)
fwrite($opfile, "###'DVB check violated Section 4.5: Each audio subsegment SHALL have a duration of not more than 15 seconds', subsegment ".($j+1)." found with duration ".$segDur." \n");
$subsegment_signaling[$sidx_index] = $ref_count - 1;
if($subsegment_signaling[$sidx_index] == 0){
if($cum_subsegDur < 1)
fwrite($opfile, "###'DVB check violated Section 4.5: Segment duration SHALL be at least 1 second except for the last segment of a Period', segment ".($j+1)." found with duration ".$segDur." \n");
$sidx_index++;
$cum_subsegDur = 0;
}
// Section 5.1.2 on AVC content's SAP type
if($hdlr_type == 'vide' && strpos($sdType, 'avc') !== FALSE){
if($sidx_boxes->length != 0){
$subseg = $sidx_boxes->item($sidx_index)->getElementsByTagName('subsegment')->item(0);
if($subseg != NULL && $subseg->getAttribute('starts_with_SAP') == '1'){
$sap_type = $subseg->getAttribute('SAP_type');
if($sap_type != '1' && $sap_type != '2')
fwrite($opfile, "###'DVB check violated: Section 5.1.2- Segments SHALL start with SAP types of 1 or 2', found $sap_type.\n");
}
}
}
//
}
else{
$ref_count = $subsegment_signaling[$sidx_index];
if($ref_count == 0){
if($hdlr_type =='vide' && $segDur>15)
fwrite($opfile, "###'DVB check violated Section 4.5: Where subsegments are not signalled, each video segment SHALL have a duration of not more than 15 seconds', segment ".($j+1)." found with duration ".$segDur." \n");
if($hdlr_type =='soun' && $segDur>15)
fwrite($opfile, "###'DVB check violated Section 4.5: Where subsegments are not signalled, each audio segment SHALL have a duration of not more than 15 seconds', segment ".($j+1)." found with duration ".$segDur." \n");
if($segDur <1)
fwrite($opfile, "###'DVB check violated Section 4.5: Segment duration SHALL be at least 1 second except for the last segment of a Period', segment ".($j+1)." found with duration ".$segDur." \n");
$sidx_index++;
}
else{
$subsegment_signaling[$sidx_index] = $ref_count - 1;
$cum_subsegDur += $segDur;
if($hdlr_type =='vide' && $segDur>15)
fwrite($opfile, "###'DVB check violated Section 4.5: Each video subsegment SHALL have a duration of not more than 15 seconds', subsegment ".($j+1)." found with duration ".$segDur." \n");
if($hdlr_type =='soun' && $segDur>15)
fwrite($opfile, "###'DVB check violated Section 4.5: Each audio subsegment SHALL have a duration of not more than 15 seconds', subsegment ".($j+1)." found with duration ".$segDur." \n");
if($subsegment_signaling[$sidx_index] == 0){
$sidx_index++;
if($cum_subsegDur < 1)
fwrite($opfile, "###'DVB check violated Section 4.5: Segment duration SHALL be at least 1 second except for the last segment of a Period', segment ".($j+1)." found with duration ".$segDur." \n");
$cum_subsegDur = 0;
}
// Section 5.1.2 on AVC content's SAP type
if($hdlr_type == 'vide' && strpos($sdType, 'avc') !== FALSE){
if($sidx_boxes->length != 0){
$subseg = $sidx_boxes->item($sidx_index)->getElementsByTagName('subsegment')->item(0);
if($subseg != NULL && $subseg->getAttribute('starts_with_SAP') == '1'){
$sap_type = $subseg->getAttribute('SAP_type');
if($sap_type != '1' && $sap_type != '2')
fwrite($opfile, "###'DVB check violated: Section 5.1.2- Segments SHALL start with SAP types of 1 or 2', found $sap_type.\n");
}
}
}
//
}
}
// Section 6.2 on HE_AACv2 and 6.5 on MPEG Surround audio content's SAP type
if($hdlr_type == 'soun' && strpos($sdType, 'mp4a') !== FALSE){
if($sidx_boxes->length != 0){
$subsegments = $sidx_boxes->item($sidx_index)->getElementsByTagName('subsegment');
if($subsegments->length != 0){
foreach($subsegments as $subsegment){
if($subsegment->getAttribute('starts_with_SAP') == '1'){
$sap_type = $subsegment->getAttribute('SAP_type');
if($sap_type != '1')
fwrite($opfile, "###'DVB check violated: Section 6.2/6.5- The content preparation SHALL ensure that each (Sub)Segment starts with a SAP type 1', found $sap_type.\n");
}
}
}
}
}
//
}
##
// Section 5.1.2 on AVC content's sample entry type
if($hdlr_type == 'vide' && strpos($sdType, 'avc') !== FALSE){
if($sdType != 'avc3' && $sdType != 'avc4')
fwrite($opfile, "Warning for DVB check: Section 5.1.2- 'Content SHOULD be offered using Inband storage for SPS/PPS i.e. sample entries 'avc3' and 'avc4'.', found $sdType.\n");
$vide_sd = $xml_rep->getElementsByTagName("$hdlr_type".'_sampledescription')->item(0);
$nal_units = $vide_sd->getElementsByTagName('NALUnit');
$sps_found = false;
$pps_found = false;
foreach($nal_units as $nal_unit){
if($nal_unit->getAttribute('nal_type') == '0x07')
$sps_found = true;
if($nal_unit->getAttribute('nal_type') == '0x08')
$pps_found = true;
}
if($sdType != 'avc3'){ // in AVC3 this data goes in the first sample of every fragment (i.e. the first sample in each mdat box).
if(!$sps_found)
fwrite($opfile, "###'DVB check violated: Section 5.1.2- All information necessary to decode any Segment chosen from the Representation SHALL be provided in the initialization Segment', SPS not found.\n");
if(!$pps_found)
fwrite($opfile, "###'DVB check violated: Section 5.1.2- All information necessary to decode any Segment chosen from the Representation SHALL be provided in the initialization Segment', PPS not found.\n");
}
}
// Section 4.5 on subtitle segment sizes
if($hdlr_type == 'subt'){
$segsize_info = '';
foreach($sizearray as $segsize){
if($segsize > 512*1024)
$segsize_info .= 'large ';
}
if($segsize_info != '')
fwrite($opfile, "###'DVB check violated: Section 4.5- Subtitle segments SHALL have a maximum segment size of 512KB', found larger segment size.\n");
}
}
function common_validation_HbbTV($opfile, $xml_rep){
global $session_dir, $mpd_features, $current_period, $current_adaptation_set, $current_representation, $reprsentation_template;
$adapt = $mpd_features['Period'][$current_period]['AdaptationSet'][$current_adaptation_set];
$rep = $adapt['Representation'][$current_representation];
## Check on the support of the provided codec
// MPD part
$codecs = $adapt['codecs'];
if($codecs == ''){
$codecs = $rep['codecs'];
}
if($codecs != ''){
$codecs_arr = explode(',', $codecs);
$str_info = '';
foreach($codecs_arr as $codec){
if(strpos($codec, 'avc') === FALSE &&
strpos($codec, 'mp4a') === FALSE && strpos($codec, 'ec-3')){
$str_info .= "$codec ";
}
}
if($str_info != '')
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for HbbTV: Section 'Codec information' - @codecs in the MPD is not supported by the specification', found $str_info.\n");
}
// Segment part
$hdlr_type = $xml_rep->getElementsByTagName('hdlr')->item(0)->getAttribute('handler_type');
$sdType = $xml_rep->getElementsByTagName("$hdlr_type".'_sampledescription')->item(0)->getAttribute('sdType');
if($hdlr_type=='vide' || $hdlr_type=='soun'){
if(strpos($sdType, 'avc') === FALSE &&
strpos($sdType, 'mp4a') === FALSE && strpos($sdType, 'ec-3') === FALSE &&
strpos($sdType, 'enc') === FALSE)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for HbbTV: Section 'Codec information' - codec in Segment is not supported by the specification', found $sdType.\n");
}
$original_format = '';
if(strpos($sdType, 'enc') !== FALSE){
$sinf_boxes = $xml_rep->getElementsByTagName('sinf');
if($sinf_boxes->length != 0){
$original_format = $sinf_boxes->item(0)->getElementsByTagName('frma')->item(0)->getAttribute('original_format');
}
}
if(strpos($sdType, 'avc') !== FALSE || strpos($original_format, 'avc') !== FALSE){
$width = $xml_rep->getElementsByTagName("$hdlr_type".'_sampledescription')->item(0)->getAttribute('width');
$height = $xml_rep->getElementsByTagName("$hdlr_type".'_sampledescription')->item(0)->getAttribute('height');
$nal_units = $xml_rep->getElementsByTagName('NALUnit');
foreach($nal_units as $nal_unit){
if($nal_unit->getAttribute('nal_type') == '0x07'){
if((int)$width <= 720 && (int)$height <= 576){
if($nal_unit->getAttribute('profile_idc') != 77 && $nal_unit->getAttribute('profile_idc') != 100)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for HbbTV: Section 'Codec information' - profile used for the codec in Segment is not supported by the specification Section 7.3.1', found " . $nal_unit->getAttribute('profile_idc') . ".\n");
$level_idc = $nal_unit->getElementsByTagName('comment')->item(0)->getAttribute('level_idc');
if($level_idc != 30)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for HbbTV: Section 'Codec information' - level used for the codec in Segment is not supported by the specification Section 7.3.1', found $level_idc.\n");
}
elseif((int)$width >= 720 && (int)$height >= 640){
if($nal_unit->getAttribute('profile_idc') != 100)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for HbbTV: Section 'Codec information' - profile used for the codec in Segment is not supported by the specification Section 7.3.1', found " . $nal_unit->getAttribute('profile_idc') . ".\n");
$level_idc = $nal_unit->getElementsByTagName('comment')->item(0)->getAttribute('level_idc');
if($level_idc != 30 && $level_idc != 31 && $level_idc != 32 && $level_idc != 40)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for HbbTV: Section 'Codec information' - level used for the codec in Segment is not supported by the specification Section 7.3.1', found $level_idc.\n");
}
}
}
}
##
##Segment checks.
$stsd = $xml_rep->getElementsByTagName('stsd')->item(0);
$vide_sample=$stsd->getElementsByTagName('vide_sampledescription');
$soun_sample=$stsd->getElementsByTagName('soun_sampledescription');
if($vide_sample->length>0 && $soun_sample->length>0)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each Representation shall contain only one media component', found both video and audio samples\n");
if($hdlr_type =='vide'){
$avcC = $xml_rep->getElementsByTagName('avcC');
if($avcC->length>0){
$nals=$xml_rep->getElementsByTagName('NALUnit');
foreach($nals as $nal_unit){
if($nal_unit->getAttribute('nal_type') =='0x07')
$sps_found=1;
if($nal_unit->getAttribute('nal_type') =='0x08')
$pps_found=1;
}
if($sdType != 'avc3'){
if($sps_found!=1)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: All info necessary to decode any Segment shall be provided in Initialization Segment', for AVC video, Sequence parameter set not found\n");
if($pps_found!=1)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: All info necessary to decode any Segment shall be provided in Initialization Segment', for AVC video, Picture parameter set not found \n");
}
}
else{
if($sdType != 'avc3')
fwrite($opfile, "###'HbbTV check violated Section E.2.3: All info necessary to decode any Segment shall be provided in Initialization Segment', for video, AVC decoder config record not found \n");
}
}
else if($hdlr_type =='soun'){
$soun_sample=$xml_rep->getElementsByTagName('soun_sampledescription');
$sdType=$soun_sample->item(0)->getAttribute('sdType');
$samplingRate=$soun_sample->item(0)->getAttribute('sampleRate');
$xml_audioDec=$xml_rep->getElementsByTagName('DecoderSpecificInfo');
if($xml_audioDec->length>0)
$channelConfig=$xml_audioDec->item(0)->getAttribute('channelConfig');
if($sdType==NULL )
fwrite($opfile, "###'HbbTV check violated Section E.2.3: All info necessary to decode any Segment shall be provided in Initialization Segment', for audio, sample description type not found \n");
if($samplingRate==NULL)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: All info necessary to decode any Segment shall be provided in Initialization Segment', for audio, sampling rate not found \n");
if($channelConfig==NULL)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: All info necessary to decode any Segment shall be provided in Initialization Segment', for audio, channel config in decoder specific info not found \n");
}
// Segment duration except the last one shall be at least one second
$sidx_boxes = $xml_rep->getElementsByTagName('sidx');
$subsegment_signaling = array();
if($sidx_boxes->length != 0){
foreach($sidx_boxes as $sidx_box){
$subsegment_signaling[] = (int)($sidx_box->getAttribute('referenceCount'));
}
}
$timescale=$xml_rep->getElementsByTagName('mdhd')->item(0)->getAttribute('timescale');
$moof_boxes = $xml_rep->getElementsByTagName('moof');
$num_moofs=$moof_boxes->length;
$sidx_index = 0;
$cum_subsegDur=0;
for($j=0;$j<$num_moofs-1;$j++){
$cummulatedSampleDuration=$xml_rep->getElementsByTagName('trun')->item($j)->getAttribute('cummulatedSampleDuration');
$segDur=$cummulatedSampleDuration/$timescale;
if(empty($subsegment_signaling) || (!empty($subsegment_signaling) && sizeof(array_unique($subsegment_signaling)) == 1 && in_array(0, $subsegment_signaling))){
if($hdlr_type =='vide' && $segDur>15)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each video segment shall have a duration of not more than 15s', segment ".($j+1)." found with duration ".$segDur." \n");
if($hdlr_type =='soun' && $segDur>15)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each audio segment shall have a duration of not more than 15s', segment ".($j+1)." found with duration ".$segDur." \n");
if($segDur <1)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Segments shall be at least 1s long except last segment of Period', segment ".($j+1)." found with duration ".$segDur." \n");
}
elseif(!empty($subsegment_signaling) && !in_array(0, $subsegment_signaling)){
$ref_count = $subsegment_signaling[$sidx_index];
$cum_subsegDur += $segDur;
if($hdlr_type =='vide' && $segDur>15)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each video segment shall have a duration of not more than 15s', segment ".($j+1)." found with duration ".$segDur." \n");
if($hdlr_type =='soun' && $segDur>15)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each audio segment shall have a duration of not more than 15s', segment ".($j+1)." found with duration ".$segDur." \n");
$subsegment_signaling[$sidx_index] = $ref_count - 1;
if($subsegment_signaling[$sidx_index] == 0){
if($cum_subsegDur < 1)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Segments shall be at least 1s long except last segment of Period', segment ".($j+1)." found with duration ".$segDur." \n");
$sidx_index++;
$cum_subsegDur = 0;
}
}
else{
$ref_count = $subsegment_signaling[$sidx_index];
if($ref_count == 0){
if($hdlr_type =='vide' && $segDur>15)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each video segment shall have a duration of not more than 15s', segment ".($j+1)." found with duration ".$segDur." \n");
if($hdlr_type =='soun' && $segDur>15)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each audio segment shall have a duration of not more than 15s', segment ".($j+1)." found with duration ".$segDur." \n");
if($segDur <1)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Segments shall be at least 1s long except last segment of Period', segment ".($j+1)." found with duration ".$segDur." \n");
$sidx_index++;
}
else{
$subsegment_signaling[$sidx_index] = $ref_count - 1;
$cum_subsegDur += $segDur;
if($hdlr_type =='vide' && $segDur>15)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each video segment shall have a duration of not more than 15s', segment ".($j+1)." found with duration ".$segDur." \n");
if($hdlr_type =='soun' && $segDur>15)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Each audio segment shall have a duration of not more than 15s', segment ".($j+1)." found with duration ".$segDur." \n");
if($subsegment_signaling[$sidx_index] == 0){
$sidx_index++;
if($cum_subsegDur < 1)
fwrite($opfile, "###'HbbTV check violated Section E.2.3: Segments shall be at least 1s long except last segment of Period', segment ".($j+1)." found with duration ".$segDur." \n");
$cum_subsegDur = 0;
}
}
}
}
$seg_loc = str_replace(array('$AS$', '$R$'), array($current_adaptation_set, $current_representation), $reprsentation_template);
if($mpd_features['type'] == 'dynamic' && count(glob($session_dir.'/'.$seg_loc.'/*')) == 1)
fwrite($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated for HbbTV: Section 'Segments' - 'Segment includes features that are not required by the profile being validated against', found only segment in the representation while MPD@type is dynamic.\n");
}
// Report on any resolutions used that are not in the tables of resoultions in 10.3 of the DVB DASH specification
function resolutionCheck($adapt, $rep){
$conformant = true;
$progressive_width = array('1920', '1600', '1280', '1024', '960', '852', '768', '720', '704', '640', '512', '480', '384', '320', '192', '3840', '3200', '2560');
$progressive_height = array('1080', '900', '720', '576', '540', '480', '432', '404', '396', '360', '288', '270', '216', '180', '108', '2160', '1800', '1440');
$interlaced_width = array('1920', '704', '544', '352');
$interlaced_height = array('1080', '576', '576', '288');
$scanType = $adapt['scanType'];
if($scanType == ''){
$scanType = $rep['scanType'];
if($scanType == '')
$scanType = 'progressive';
}
$width = $adapt['width'];
$height = $adapt['height'];
if($width == '' && $height == ''){
$width = $rep['width'];
$height = $rep['height'];
if($width != '' && $height != ''){
if($scanType == 'progressive'){
$ind1 = array_search($width, $progressive_width);
if($ind1 !== FALSE){
if($height != $progressive_height[$ind1])
$conformant = false;
}
}
elseif($scanType == 'interlaced'){
$ind1 = array_search($width, $interlaced_width);
if($ind1 !== FALSE){
if($height != $interlaced_height[$ind1])
$conformant = false;
}
}
}
}
return array($conformant, $width, $height);
}
function seg_timing_common($opfile, $xml_rep){
global $mpd_features;
$xml_num_moofs=$xml_rep->getElementsByTagName('moof')->length;
$xml_trun=$xml_rep->getElementsByTagName('trun');
$xml_tfdt=$xml_rep->getElementsByTagName('tfdt');
## Consistency check of the start times within the segments with the timing indicated by the MPD
// MPD information
$mpd_timing = mdp_timing_info();
// Segment information
$type = $mpd_features['type'];
$sidx_boxes = $xml_rep->getElementsByTagName('sidx');
$subsegment_signaling = array();
if($sidx_boxes->length != 0){
foreach($sidx_boxes as $sidx_box){
$subsegment_signaling[] = (int)($sidx_box->getAttribute('referenceCount'));
}
}
$xml_elst = $xml_rep->getElementsByTagName('elst');
if($xml_elst->length == 0){
$mediaTime = 0;
}
else{
$mediaTime = (int)($xml_elst->item(0)->getElementsByTagName('elstEntry')->item(0)->getAttribute('mediaTime'));
}
$timescale=$xml_rep->getElementsByTagName('mdhd')->item(0)->getAttribute('timescale');
$sidx_index = 0;
$cum_subsegDur=0;
for($j=0;$j<$xml_num_moofs;$j++){
## Checking for gaps
if($j > 0){
$cummulatedSampleDurFragPrev=$xml_trun->item($j-1)->getAttribute('cummulatedSampleDuration');
$decodeTimeFragPrev=$xml_tfdt->item($j-1)->getAttribute('baseMediaDecodeTime');
$decodeTimeFragCurr=$xml_tfdt->item($j)->getAttribute('baseMediaDecodeTime');
if($decodeTimeFragCurr!=$decodeTimeFragPrev+$cummulatedSampleDurFragPrev){
fprintf($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated: Section 'Segments' - A gap in the timing within the segments of the Representation found at segment number ".($j+1)."\n");
}
}
##
if(!empty($mpd_timing) && $type != 'dynamic'){ //Empty means that there is no mediaPresentationDuration attribute in which case the media presentation duration is unknown.
$decodeTime = $xml_tfdt->item($j)->getAttribute('baseMediaDecodeTime');
$compTime = $xml_trun->item($j)->getAttribute('earliestCompositionTime');
$segmentTime = ($decodeTime + $compTime - $mediaTime)/$timescale;
if(empty($subsegment_signaling)){
if($j < sizeof($mpd_timing)){
if(abs(($segmentTime - $mpd_timing[$j])/$mpd_timing[$j]) > 0.00001)
fprintf($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated: Section 'Segments' - Start time \"$segmentTime\" within the segment " . ($j+1) . " is not consistent with the timing indicated by the MPD \"$mpd_timing[$j]\".\n");
}
}
else{
$ref_count = 1;
if($sidx_index < sizeof($subsegment_signaling))
$ref_count = $subsegment_signaling[$sidx_index];
if($cum_subsegDur == 0 && $sidx_index < sizeof($mpd_timing)){
if(abs(($segmentTime - $mpd_timing[$sidx_index])/$mpd_timing[$sidx_index]) > 0.00001)
fprintf($opfile, "###'HbbTV-DVB DASH Validation Requirements check violated: Section 'Segments' - Start time \"$segmentTime\" within the segment " . ($sidx_index+1) . " is not consistent with the timing indicated by the MPD \"$mpd_timing[$sidx_index]\".\n");
}
$cummulatedSampleDuration=$xml_trun->item($j)->getAttribute('cummulatedSampleDuration');
$segDur=$cummulatedSampleDuration/$timescale;
$cum_subsegDur += $segDur;
$subsegment_signaling[$sidx_index] = $ref_count - 1;
if($subsegment_signaling[$sidx_index] == 0){
$sidx_index++;
$cum_subsegDur = 0;
}
}
}
}
##
}
function bitrate_report($xml_rep){
global $session_dir, $mpd_features, $current_period, $current_adaptation_set, $current_representation,
$sizearray, $segment_duration_array, $reprsentation_template;
$bandwidth = $mpd_features['Period'][$current_period]['AdaptationSet'][$current_adaptation_set]['Representation'][$current_representation]['bandwidth'];
$sidx_boxes = $xml_rep->getElementsByTagName('sidx');
$subsegment_signaling = array();
if($sidx_boxes->length != 0){
foreach($sidx_boxes as $sidx_box){
$subsegment_signaling[] = (int)($sidx_box->getAttribute('referenceCount'));
}
}
$timescale=$xml_rep->getElementsByTagName('mdhd')->item(0)->getAttribute('timescale');
$num_moofs=$xml_rep->getElementsByTagName('moof')->length;
$bitrate_info = '';
$segment_duration_array = array();
$sidx_index = 0;
$cum_subsegDur = 0;
// Here 2 possible cases are considered for sidx -subsegment signalling.
//First case is for no sidx box.
if(empty($subsegment_signaling)){
for($j=0;$j<$num_moofs;$j++){
$cummulatedSampleDuration=$xml_rep->getElementsByTagName('trun')->item($j)->getAttribute('cummulatedSampleDuration');
$segDur=$cummulatedSampleDuration/$timescale;
$segSize = $sizearray[$j];
$segment_duration_array[] = round($segDur, 2);
$bitrate_info = $bitrate_info . (string)($segSize*8/$segDur) . ',';
}
}
//Secondly, sidx exists with non-zero reference counts- 1) all segments have subsegments (referenced by some sidx boxes) 2) only some segments have subsegments.
else{
for($j=0;$j<$num_moofs;$j++){
if($sidx_index>sizeof($subsegment_signaling)-1)
$ref_count=1;// This for case 2 of case 2.
else
$ref_count = $subsegment_signaling[$sidx_index];
$cummulatedSampleDuration=$xml_rep->getElementsByTagName('trun')->item($j)->getAttribute('cummulatedSampleDuration');
$segDur=$cummulatedSampleDuration/$timescale;
$cum_subsegDur += $segDur;
$subsegment_signaling[$sidx_index] = $ref_count - 1;
if($subsegment_signaling[$sidx_index] == 0){
$segSize = $sizearray[$sidx_index];
$bitrate_info = $bitrate_info . (string)($segSize*8/$cum_subsegDur) . ',';
$segment_duration_array[] = round($cum_subsegDur);
$sidx_index++;
$cum_subsegDur = 0;
}
}
}
$bitrate_info = substr($bitrate_info, 0, strlen($bitrate_info)-2);
$bitrate_report_name = str_replace(array('$AS$', '$R$'), array($current_adaptation_set, $current_representation), $reprsentation_template) . '.png';
$location = $session_dir. '/Period' . $current_period . '/' . $bitrate_report_name;
$command="cd $session_dir && python bitratereport.py $bitrate_info $bandwidth $location";
exec($command);
//chmod($session_dir.'/'.$bitrate_report_name, 777);
return $bitrate_report_name;
}
function seg_duration_checks($opfile){
global $session_dir, $mpd_features, $current_period, $current_adaptation_set, $current_representation, $segment_duration_array, $adaptation_set_template, $reprsentation_template;
$period = $mpd_features['Period'][$current_period];
$adapt_set = $period['AdaptationSet'][$current_adaptation_set];
$rep = $adapt_set['Representation'][$current_representation];
$adapt_id = $current_adaptation_set + 1;
$rep_id = ($rep['id'] != NULL) ? $rep['id'] : $current_representation+1;
if(sizeof($rep['SegmentTemplate']) != 0)//only if there is a segment template in the representation get the timescale and duration
$seg_template = $rep['SegmentTemplate'][0];
elseif(sizeof($adapt_set['SegmentTemplate']) != 0)
$seg_template = $adapt_set['SegmentTemplate'][0];
elseif (sizeof($period['SegmentTemplate']) != 0)
$seg_template = $period['SegmentTemplate'][0];
else
$MPD_duration_sec = 'Not_Set';
if($MPD_duration_sec != 'Not_Set'){ //if there is a segment template
$duration_diff_array = array(); //array to hold the duration of segments present in atom file that are different from that advertised in the MPD
$duration = $seg_template['duration'];
$timescale = $seg_template['timescale'];
if(($duration != '') && ($timescale != '')){
$MPD_duration_sec = round(($duration / $timescale), 2);
$ind = 0;
foreach ($segment_duration_array as $atom_seg_duration){
$ind++;
if($atom_seg_duration != $MPD_duration_sec){
$duration_diff_array[$ind] = $atom_seg_duration;
}