//@"\$(RepresentationID|Time|Time(%0([\d]+)([dx])?)?|Number|Number(%0([\d]+)([dx])?)?|Bandwidth)\$");
public static IList <IList <(Representation Video, Representation Audio)> > Parse(
string[] manifestLines,
string playlistUrl)
{
using var memstream = new MemoryStream(Encoding.UTF8.GetBytes(string.Join("\n", manifestLines)));
var xmldoc = new XmlDocument();
xmldoc.Load(new XmlTextReader(memstream)
{
Namespaces = false
});
if (xmldoc.DocumentElement?.Name != "MPD")
{
throw new Exception("Missing MPD start tag: " + xmldoc.DocumentElement.Name);
}
if (xmldoc.DocumentElement.Attributes["type"]?.Value == "dynamic")
{
throw new Exception("Manifest type dynamic is not supported");
}
if (xmldoc.DocumentElement.SelectSingleNode("descendant::ContentProtection") != null)
{
throw new Exception("Encrypted manifest");
}
var mediaList = new List <IList <(Representation Video, Representation Audio)> >();
var mediaPresentationDuration =
DashUtil.ParseXsDuration(xmldoc.DocumentElement.Attributes["mediaPresentationDuration"]?.Value ?? "0");
var baseUrl = new Uri(playlistUrl);
var baseUrlNodeRoot = xmldoc.DocumentElement.SelectSingleNode("child::BaseURL");
if (baseUrlNodeRoot != null)
{
baseUrl = UrlResolver.Resolve(baseUrl, baseUrlNodeRoot.InnerText);
}
var periods = xmldoc.DocumentElement.SelectNodes("child::Period");
if (periods == null || periods.Count < 1)
{
throw new Exception("No period found!");
}
if (periods.Count > 1)
{
var periodDurations = CalculatePeriodDurationsIfMissing(periods, mediaPresentationDuration);
for (var i = 0; i < periods.Count; i++)
{
var period = periods[i];
mediaList.Add(ParsePeriod(period, baseUrl, periodDurations[i]));
}
}
else if (periods.Count == 1)
{
mediaList.Add(ParsePeriod(periods[0], baseUrl, mediaPresentationDuration));
}
return(mediaList);
}
public static IList <long> CalculatePeriodDurationsIfMissing(XmlNodeList periods, long mediaPresentationDuration)
{
var stack = new Stack <XmlNode>();
foreach (XmlNode node in periods)
{
stack.Push(node);
}
var list = new List <long>(periods.Count);
var last = mediaPresentationDuration;
var count = stack.Count;
for (int i = 0; i < count; i++)
{
var node = stack.Pop();
var sduration = node.Attributes["duration"]?.Value;
var sstart = node.Attributes["start"]?.Value;
if (sstart == null && sduration == null)
{
throw new Exception("Both period start and duration is missing");
}
if (sduration != null)
{
var duration = DashUtil.ParseXsDuration(sduration);
list.Add(duration);
last = mediaPresentationDuration - duration;
continue;
}
if (sstart == null && i == stack.Count - 1)
{
sstart = "PT0S";
}
var start = DashUtil.ParseXsDuration(sstart);
list.Add(last - start);
last = start;
}
list.Reverse();
return(list);
}