public void ToBuffer(ref TSMessagePackWriter writer)
{
Header.ToBuffer(ref writer);
writer.WriteByte(TableId);
//SectionSyntaxIndicator Zero Reserved1 SectionLength
//1 0 11 0000 0000 0000
//(ushort)(0b_1011_0000_0000_0000 | SectionLength)
writer.Skip(2, out int SectionLengthPosition);
writer.WriteUInt16(TransportStreamId);
//Reserved2 VersionNumber CurrentNextIndicator
//11 00000 1
var a = 0xC0 & (Reserved2 << 6);
var b = 0x3E & (VersionNumber << 3);
var c = (byte)(a | b | CurrentNextIndicator);
writer.WriteByte(c);
writer.WriteByte(SectionNumber);
writer.WriteByte(LastSectionNumber);
if (Programs != null)
{
foreach (var program in Programs)
{
program.ToBuffer(ref writer);
}
}
const int crcLength = 4;
writer.WriteUInt16Return((ushort)(0b_1011_0000_0000_0000 | (ushort)(writer.GetCurrentPosition() - SectionLengthPosition - 2) + crcLength), SectionLengthPosition);
//打包ts流时PAT和PMT表是没有adaptation field的，不够的长度直接补0xff即可。
//ts header(4B) + adaptation field length(1)
writer.WriteCRC32(5);
var size = TSConstants.FiexdPackageLength - writer.GetCurrentPosition();
writer.WriteArray(Enumerable.Range(0, size).Select(s => (byte)0xFF).ToArray());
}
public void ToBuffer(ref TSMessagePackWriter writer)
{
Header.PackageType = PackageType.SDT;
Header.ToBuffer(ref writer);
writer.WriteByte(TableId);
writer.Skip(2, out int SectionLengthPosition);
writer.WriteUInt16(TransportStreamId);
writer.WriteByte((byte)(Reserved2 << 6 | VersionNumber << 1 | CurrentNextIndicator));
writer.WriteByte(SectionNumber);
writer.WriteByte(LastSectionNumber);
writer.WriteUInt16(OriginalNetworkId);
writer.WriteByte(ReservedFutureUse2);
foreach (var service in Services)
{
service.ToBuffer(ref writer);
}
ushort servicesLength = (ushort)(writer.GetCurrentPosition() - SectionLengthPosition - 2);
const int crcLength = 4;
writer.WriteUInt16Return((ushort)(SectionSyntaxIndicator << 15 | ReservedFutureUse1 << 14 | Reserved1 << 12 | servicesLength + crcLength), SectionLengthPosition);
writer.WriteCRC32(5);
var size = TSConstants.FiexdPackageLength - writer.GetCurrentPosition();
writer.WriteArray(Enumerable.Range(0, size).Select(s => (byte)0xFF).ToArray());
}