private List <(ElementDescriptor Element, ulong Position)> ReadSeekHeads(EbmlReader ebmlReader)
{
List <(ElementDescriptor, ulong)> availableElements = null;
ElementDescriptor desc;
ElementDescriptor availDesc = null;
ulong pos = 0;
ebmlReader.EnterContainer();
while (ebmlReader.ReadNext())
{
if (_descriptorsMap.TryGetValue(ebmlReader.ElementId.EncodedValue, out desc))
{
if (desc.Name == "Seek")
{
ebmlReader.EnterContainer();
try
{
while (ebmlReader.ReadNext())
{
if (_descriptorsMap.TryGetValue(ebmlReader.ElementId.EncodedValue, out desc))
{
if (desc.Name == "SeekID")
{
byte[] data = new byte[ebmlReader.ElementSize];
ebmlReader.ReadBinary(data, 0, data.Length);
MemoryStream mem = new MemoryStream(data);
byte[] temp = new byte[data.Length];
VInt id = VInt.Read(mem, data.Length, temp);
_descriptorsMap.TryGetValue(id.EncodedValue, out availDesc);
}
else if (desc.Name == "SeekPosition")
{
pos = ebmlReader.ReadUInt();
}
}
}
if (availableElements == null)
{
availableElements = new List <(ElementDescriptor, ulong)>();
}
if (availDesc != null && pos > 0)
{
availableElements.Add((availDesc, pos));
}
}
catch { }
}
ebmlReader.LeaveContainer();
}
}
ebmlReader.LeaveContainer();
return(availableElements);
}