public override string ToTextualConvention(Container.Node node)
{
if (node.Master.Equals(this))
{
return(PacketizedElementaryStreamReader.ToTextualConvention(node.Identifier));
}
return(base.ToTextualConvention(node));
}
//Might need the data not the identifier
public static string ToTextualConvention(byte[] identifier)
{
return(PacketizedElementaryStreamReader.ToTextualConvention(identifier));
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public override Container.Node ReadNext()
{
//Read a code
byte[] identifier = PacketizedElementaryStreamReader.ReadIdentifier(this);
//Check for sync
if (Common.Binary.ReadU24(identifier, 0, Media.Common.Binary.IsBigEndian) != Common.Binary.ReadU24(Mpeg.StartCodes.StartCodePrefix, 0, Media.Common.Binary.IsBigEndian))
{
throw new InvalidOperationException("Cannot Find StartCode Prefix.");
}
int length = 0, lengthSize = PacketizedElementaryStreamReader.LengthSize;
//Determine which type of node we are dealing with
switch (identifier[3])
{
case Mpeg.StreamTypes.PackHeader:
{
//No bytes are related to the length yet
lengthSize = 0;
//MPEG 1 Used only 2 bits 0 1
//MPEG 2 Used 4 bits 0 0 0 1
byte next = (byte)ReadByte();
//We are at the 5th byte. (IdentifierSize + 1)
int offset = 5;
//Determine which version of the Pack Header this is
switch (next >> 6)
{
case 0: //MPEG 1
{
//Read 7 more bytes (The rest of the MPEG 1 Pack Header)
Array.Resize(ref identifier, 12);
Read(identifier, offset, 7);
break;
}
default: //MPEG 2
{
//Read 9 more bytes (the rest of the MPEG 2 Pack Header)
Array.Resize(ref identifier, 14);
Read(identifier, offset, 9);
//Include Stuffing length with mask (00000111) reversed bits
length = (byte)(identifier[13] & 0x07);
break;
}
}
//Put the 4th byte back
identifier[IdentifierSize] = next;
break;
}
case Mpeg.StreamTypes.ProgramEnd:
{
//End of Program Stream.
break;
}
default: //PESPacket
{
//lengthSize already set
length = PacketizedElementaryStreamReader.DecodeLength(PacketizedElementaryStreamReader.ReadLength(this));
break;
}
}
return(new Media.Container.Node(this, identifier, lengthSize, Position, length, length <= Remaining));
}