public RTPChannel(IPEndPoint localEndPoint, IPEndPoint remoteEndPoint)
{
m_localEndPoint = localEndPoint;
m_remoteEndPoint = remoteEndPoint;
m_rtpListener = new UDPListener(localEndPoint);
m_rtpListener.PacketReceived += RTPPacketReceived;
}
private void RTPPacketReceived(UDPListener listener, IPEndPoint localEndPoint, IPEndPoint remoteEndPoint, byte[] buffer)
{
if ((buffer[0] == 0x0 || buffer[0] == 0x1) && buffer.Length >= 20)
{
// Probably a STUN request.
STUNMessage stunMessage = STUNMessage.ParseSTUNMessage(buffer, buffer.Length);
if (stunMessage != null)
{
logger.Debug("STUN message received on RTP channel " + stunMessage.Header.MessageType + ".");
if (stunMessage.Header.MessageType == STUNMessageTypesEnum.BindingRequest)
{
logger.Debug("RTP channel sending STUN response to " + remoteEndPoint + ".");
STUNMessage stunResponse = new STUNMessage();
stunResponse.Header.MessageType = STUNMessageTypesEnum.BindingResponse;
stunResponse.Header.TransactionId = stunMessage.Header.TransactionId;
stunResponse.AddUsernameAttribute(Encoding.UTF8.GetString(stunMessage.Attributes[0].Value));
byte[] stunRespBytes = stunResponse.ToByteBuffer();
SendRaw(remoteEndPoint, stunRespBytes, stunRespBytes.Length);
}
}
}
else
{
logger.Debug("RTP packet received from " + remoteEndPoint + ".");
if (SampleReceived != null)
{
var rtpHeader = new RTPHeader(buffer);
SampleReceived(buffer, rtpHeader.Length);
}
}
}
