public bool TryParse(ref SequenceReader <byte> reader)
{
if (!reader.TryRead(out var value))
{
return(false);
}
HeaderType = (RtmpChunkHeaderType)(value >> 6);
StreamId = value & 0x3f;
if (StreamId == 0)
{
if (!reader.TryRead(out value))
{
return(false);
}
StreamId = value + 64;
}
else if (StreamId == 1)
{
if (!reader.TryReadBigEndian(out short temp))
{
return(false);
}
StreamId = temp + 64;
}
return(true);
}
public static int GetHeaderLength(RtmpChunkHeaderType headerType)
{
switch (headerType)
{
case RtmpChunkHeaderType.Type0:
return(11);
case RtmpChunkHeaderType.Type1:
return(7);
case RtmpChunkHeaderType.Type2:
return(3);
default:
return(0);
}
}
public void Write(Span <byte> buffer, RtmpChunkHeaderType headerType)
{
if (headerType < RtmpChunkHeaderType.Type3)
{
buffer.WriteInt24BigEndian(Timestamp > 0xFFFFF ? 0xFFFFFF : Timestamp);
if (headerType < RtmpChunkHeaderType.Type2)
{
buffer = buffer.Slice(3);
buffer.WriteInt24BigEndian(Length);
buffer[3] = (byte)MessageType;
buffer = buffer.Slice(4);
}
if (headerType < RtmpChunkHeaderType.Type1)
{
buffer = buffer.Slice(3);
BinaryPrimitives.WriteInt32LittleEndian(buffer, StreamId);
}
if (Timestamp > 0xFFFFFF)
{
BinaryPrimitives.WriteInt32BigEndian(buffer, Timestamp);
}
}
}
public RtmpChunkHeader(RtmpChunkHeaderType messageType, int streamId)
{
HeaderType = messageType;
StreamId = streamId;
}
public bool TryParse(ref SequenceReader <byte> reader, RtmpChunkHeaderType headerType, RtmpMessageHeader?previous)
{
var extendedTimestamp = false;
if (headerType < RtmpChunkHeaderType.Type3)
{
if (!reader.TryReadInt24BigEndian(out var time))
{
return(false);
}
if (time == 0xFFFFFF)
{
extendedTimestamp = true;
}
else if (headerType == RtmpChunkHeaderType.Type0)
{
Timestamp = time;
}
else
{
Timestamp = (previous?.Timestamp ?? 0) + time;
}
}
else
{
Timestamp = previous?.Timestamp ?? 0;
}
if (headerType < RtmpChunkHeaderType.Type2)
{
if (!reader.TryReadInt24BigEndian(out var length))
{
return(false);
}
Length = length;
if (!reader.TryRead(out byte id))
{
return(false);
}
MessageType = (RtmpMessageType)id;
if (!Enum.IsDefined(typeof(RtmpMessageType), id))
{
throw new Exception($"Unknown Message type {id}!");
}
}
else
{
Length = previous?.Length ?? 0;
MessageType = previous?.MessageType ?? RtmpMessageType.None;
}
if (headerType == RtmpChunkHeaderType.Type0)
{
if (!reader.TryReadLittleEndian(out int streamId))
{
return(false);
}
StreamId = streamId;
}
else
{
StreamId = previous?.StreamId ?? 0;
}
if (extendedTimestamp)
{
if (!reader.TryReadBigEndian(out int time))
{
return(false);
}
Timestamp = time;
}
return(true);
}
