public Operation(Packet call, Action<Operation> handler)
{
if (call != null)
{
Call = call;
Call.EncodePayload();
ChunkStreamId = call.ChunkStreamId;
}
Handler = handler;
}
public Packet Parse()
{
var p = new Packet();
byte header = _socket.ReceiveByte();
int chunktype = (header & 0xC0) >> 6;
p.ChunkType = chunktype;
p.ChunkStreamId = header & 0x3F;
switch (p.ChunkStreamId)
{
case 0:
p.ChunkStreamId = 64 + _socket.ReceiveByte();
break;
case 1:
p.ChunkStreamId = 64 + _socket.ReceiveByte() + (_socket.ReceiveByte()*256);
break;
}
switch (p.ChunkType)
{
case 3:
p.TimeStamp = _previousReadPacket[p.ChunkStreamId].TimeStamp;
p.Length = _previousReadPacket[p.ChunkStreamId].Length;
p.Type = _previousReadPacket[p.ChunkStreamId].Type;
p.MessageStreamId = _previousReadPacket[p.ChunkStreamId].MessageStreamId;
break;
case 2:
p.Length = _previousReadPacket[p.ChunkStreamId].Length;
p.Type = _previousReadPacket[p.ChunkStreamId].Type;
p.MessageStreamId = _previousReadPacket[p.ChunkStreamId].MessageStreamId;
break;
case 1:
p.MessageStreamId = _previousReadPacket[p.ChunkStreamId].MessageStreamId;
break;
case 0:
break;
}
_previousReadPacket[p.ChunkStreamId] = p;
int headersize = HeaderSizes[p.ChunkType];
if (headersize == MaxHeaderSize)
{
p.HasAbsTimestamp = true;
}
if (!Operations.ContainsKey(p.ChunkStreamId))
{
Operations[p.ChunkStreamId] = new Operation();
}
if (Operations[p.ChunkStreamId].Response != null)
{
p = Operations[p.ChunkStreamId].Response;
headersize = 0;
}
else
{
Operations[p.ChunkStreamId].CreateResponse(p);
}
headersize--;
var headerbytes = new byte[0];
if (headersize > 0)
{
headerbytes = new byte[headersize];
_socket.Receive(headerbytes, 0, headersize);
}
using (var headerstream = new MemoryStream(headerbytes))
{
if (headersize >= 3)
{
p.TimeStamp = (int) Utils.GetUInt24(headerstream.ReadBytes(3), 0);
if (!p.HasAbsTimestamp)
{
if (!_streamTimestamps.ContainsKey(p.ChunkStreamId)) _streamTimestamps[p.ChunkStreamId] = 0;
p.TimeStamp += _streamTimestamps[p.ChunkStreamId];
_streamTimestamps[p.ChunkStreamId] = p.TimeStamp;
}
}
if (headersize >= 6)
{
p.Length = (int) Utils.GetUInt24(headerstream.ReadBytes(3), 0);
p.BytesRead = 0;
p.BytePayload = null;
}
if (headersize > 6)
{
p.Type = (PayloadType) headerstream.ReadByte();
}
if (headersize == 11)
{
p.MessageStreamId = DataConverter.LittleEndian.GetInt32(headerstream.ReadBytes(4), 0);
}
}
int ntoread = p.Length - p.BytesRead;
int nchunk = ChunkSizeR;
if (ntoread < nchunk)
{
nchunk = ntoread;
}
if (p.BytePayload == null)
{
p.BytePayload = new byte[0];
}
int prevLength = p.BytePayload.Length;
Array.Resize(ref p.BytePayload, prevLength + nchunk);
_socket.Receive(p.BytePayload, prevLength, nchunk);
if (p.BytesRead + nchunk != p.BytePayload.Length)
{
throw new Exception(String.Format("Read failed, have read {0} of {1}", p.BytePayload.Length,
p.BytesRead + nchunk));
}
p.BytesRead += nchunk;
if (!p.IsReady())
{
return null;
}
p.DecodePayload();
//Special cases that affect the packet parser
switch (p.Type)
{
case PayloadType.CHUNK_SIZE:
ChunkSizeR = ((ChunkSize) p.Payload).Size;
break;
case PayloadType.VIDEO:
var v = (Video) p.Payload;
v.FlvTag.TimeStamp = (uint) p.TimeStamp;
//v.FlvTag.StreamID = (uint)p.MessageStreamID;
break;
case PayloadType.AUDIO:
var a = (Audio) p.Payload;
a.FlvTag.TimeStamp = (uint) p.TimeStamp;
//v.FlvTag.StreamID = (uint)p.MessageStreamID;
break;
}
return p;
}
public void CreateResponse(Packet packet)
{
Response = packet;
}
