/// <summary>
/// Read the adaption field for this packet
/// <para><see cref="af"/> must start at the begingging of the Adaption Field</para>
/// </summary>
/// <param name="af"></param>
/// <returns>True if parsing was a success</returns>
public static AdaptationField Parse(ReadOnlySequence <byte> af)
{
var sr = new SequenceReader <byte>(af);
if (sr.TryRead(out byte adaptionFieldLength))
{
var ret = new AdaptationField()
{
Length = adaptionFieldLength
};
if (ret.Length > 0 && sr.TryRead(out byte afFlags))
{
ret.Flags = (AdaptationFieldFlags)afFlags;
if (ret.Flags.HasFlag(AdaptationFieldFlags.PCR))
{
var pcr = ReadPTS(af.Slice(sr.Position));
if (pcr != null)
{
ret.PCR = pcr.Value;
sr.Advance(6);
}
else
{
return(default);
/// <summary>
/// Read the header portion of a TSPacket
/// </summary>
/// <param name="header"></param>
/// <returns></returns>
public static Packet Parse(ReadOnlySequence <byte> header)
{
var sr = new SequenceReader <byte>(header);
if (sr.TryReadBigEndian(out int hv))
{
var pkt = new Packet()
{
TransportError = (hv & 0x800000) > 1,
PayloadUnitStart = (hv & 0x400000) > 1,
TransportPriority = (hv & 0x200000) > 1,
Pid = (ushort)((hv & 0x001fff) >> 8),
Scrambling = (TransportScramblingControl)((hv & 0xc0) >> 6),
AdaptationFieldControl = (AdaptationFieldControl)((hv & 0x30) >> 4),
Continuity = (byte)(hv & 0x0f)
};
if (pkt.HasAdaptionField)
{
var af = AdaptationField.Parse(header.Slice(sr.Position));
if (!af.Equals(default))
public void Validate()
{
/*if (!((int)AdaptationFieldControl >= 1 && (int)AdaptationFieldControl <= 3))
* {
* throw new Exception("Invalid AFC");
* }*/
if (Pid > 8191)
{
throw new Exception("Invalid PID");
}
if (!((int)Scrambling >= 0 && (int)Scrambling <= 3))
{
throw new Exception("Invalid TSC");
}
if (HasAdaptionField)
{
AdaptationField.Validate();
}
if (HasPayload && Payload == null)
{
throw new Exception("Payload was null");
}
}
