static function nestedStart($tag, $media_tag)
{
$neg_one = floatval(-1);
// start for a nested tag is the sum of its start and its parents
$parent = $tag;
$result = floatval((string) $parent['start']);
while ($parent != NULL && (int) $parent['track'] < 0) {
$child = $parent;
$type = (string) $child['type'];
$parent = MovieMasher_Coder_Decoder::parentTag($child);
switch ($type) {
case 'theme':
// TODO: create a property for themes to indicate how many composites to utilize
// TODO: create a property for themes to indicate how many composites to utilize
case 'video':
case 'image':
// my parent is some sort of composite
// only include me if I'm the first child
if ($parent != NULL) {
$children = $parent->children();
if (sizeof($children)) {
$first_child = $children[0];
if (!($first_child == $child || $first_child->asXML() == $child->asXML())) {
return $neg_one;
}
}
}
}
if ($parent != NULL) {
$result += floatval((string) $parent['start']);
}
}
return $result;
}
