public ServiceDescriptor(byte[] bytes, int programNumber, int networkId)
{
ProgramNumber = programNumber;
var pos = 0;
Tag = bytes[pos + 0];
Length = bytes[pos + 1];
ServisType = bytes[pos + 2];
ProviderNameLength = bytes[pos + 3];
pos = pos + 4;
ProviderName = MPEGTSCharReader.ReadString(bytes, pos, ProviderNameLength);
if (String.IsNullOrEmpty(ProviderName))
{
// not supported encoding ?
ProviderName = $"Network #{networkId}";
}
pos = pos + ProviderNameLength;
ServiceNameLength = bytes[pos + 0];
pos = pos + 1;
ServiceName = MPEGTSCharReader.ReadString(bytes, pos, ServiceNameLength);
if (String.IsNullOrEmpty(ServiceName))
{
// not supported encoding ?
ServiceName = $"Program #{programNumber}";
}
}
public static ShortEventDescriptor Parse(byte[] bytes)
{
var res = new ShortEventDescriptor();
res.Tag = bytes[0];
res.Length = bytes[1];
res.LanguageCode = Encoding.GetEncoding("iso-8859-1").GetString(bytes, 2, 3);
var eventNameLength = bytes[5];
var pos = 6;
res.EventName = MPEGTSCharReader.ReadString(bytes, pos, eventNameLength, true);
pos = pos + eventNameLength;
var textLength = bytes[pos];
pos++;
res.Text = MPEGTSCharReader.ReadString(bytes, pos, textLength, true);
return(res);
}
public override void Parse(List <byte> bytes)
{
if (bytes == null || bytes.Count < 5)
{
return;
}
var pointerFiled = bytes[0];
var pos = 1;
if (pointerFiled != 0)
{
pos = pos + pointerFiled + 1;
}
if (bytes.Count < pos + 2)
{
return;
}
ID = bytes[pos];
if (ID != 0x40) // 0x40 = network_information_section - actual_network
{
return;
}
SectionSyntaxIndicator = ((bytes[pos + 1] & 128) == 128);
Private = ((bytes[pos + 1] & 64) == 64);
Reserved = Convert.ToByte((bytes[pos + 1] & 48) >> 4);
SectionLength = Convert.ToInt32(((bytes[pos + 1] & 15) << 8) + bytes[pos + 2]); // the number of bytes of the section, starting immediately following the section_length field and including the CRC.
Data = new byte[SectionLength];
CRC = new byte[4];
bytes.CopyTo(0, Data, 0, SectionLength);
bytes.CopyTo(SectionLength, CRC, 0, 4);
pos = pos + 3;
NetworkID = (bytes[pos + 0] << 8) + bytes[pos + 1];
pos = pos + 2;
Version = Convert.ToByte((bytes[pos + 0] & 64) >> 1);
CurrentIndicator = (bytes[pos + 0] & 1) == 1;
SectionNumber = bytes[pos + 1];
LastSectionNumber = bytes[pos + 2];
pos = pos + 3;
var networkDecriptorsLength = Convert.ToInt32(((bytes[pos + 0] & 15) << 8) + bytes[pos + 1]);
pos = pos + 2;
// network decriptors folowing
var posAfterNetworkDescriptors = pos + networkDecriptorsLength;
while (pos < posAfterNetworkDescriptors)
{
var descriptorTag = bytes[pos + 0];
var descriptorLength = bytes[pos + 1];
if (descriptorTag == 0x40) // network_name_descriptor
{
NetworkName = MPEGTSCharReader.ReadString(bytes.ToArray(), pos + 2, descriptorLength);
if (String.IsNullOrEmpty(NetworkName))
{
// bad encoding?
NetworkName = $"Network #{NetworkID}";
}
}
else
if (descriptorTag == 0x40) // linkage_descriptor
{
// 74 (dec) 4A (hex) - linkage_descriptor
TransportStreamId = Convert.ToInt32(((bytes[pos + 2]) << 8) + bytes[pos + 3]);
OriginalNetworkId = Convert.ToInt32(((bytes[pos + 4]) << 8) + bytes[pos + 5]);
ServiceId = Convert.ToInt32(((bytes[pos + 6]) << 8) + bytes[pos + 7]);
LinkageType = bytes[pos + 8];
}
else
if (descriptorTag == 0x41)
{
// Service list descriptor
var descriptorBytes = new byte[descriptorLength];
bytes.CopyTo(pos, descriptorBytes, 0, descriptorLength);
ServiceList = new ServiceListDescriptor(descriptorBytes);
}
else
{
// unsupported descriptor
}
pos += descriptorLength + 2;
}
var transportStreamLoopLength = Convert.ToInt32(((bytes[pos + 0] & 15) << 8) + bytes[pos + 1]);
pos += 2;
var posAfterTransportStreams = pos + transportStreamLoopLength;
while (pos < posAfterTransportStreams)
{
TransportStreamId = Convert.ToInt32(((bytes[pos + 0]) << 8) + bytes[pos + 1]);
OriginalNetworkId = Convert.ToInt32(((bytes[pos + 2]) << 8) + bytes[pos + 3]);
var transportDescriptorsLength = Convert.ToInt32(((bytes[pos + 4] & 15) << 8) + bytes[pos + 5]);
pos += 6;
var posAfterTransportDescriptors = pos + transportDescriptorsLength;
while (pos < posAfterTransportDescriptors)
{
var descriptorTag = bytes[pos + 0];
var descriptorLength = bytes[pos + 1];
if (descriptorTag == 0x41)
{
// Service list descriptor
var descriptorBytes = new byte[descriptorLength];
bytes.CopyTo(pos, descriptorBytes, 0, descriptorLength);
ServiceList = new ServiceListDescriptor(descriptorBytes);
}
//Console.WriteLine($"Found NIT transport descriptor: {descriptorTag} ({Convert.ToString(descriptorTag,16)})");
pos += descriptorLength + 2;
}
}
}
