void IMaslConnectionObserver.OnMaslUserDataArrival(byte[] maslUserData)
{
try
{
var frame = SaiFrame.Parse(maslUserData);
if (this.CheckFrame(frame))
{
_seqNoManager.UpdateAckSeq(frame.SequenceNo);
_currentState.HandleFrame(frame);
if (this.SaiFrameReceived != null)
{
this.SaiFrameReceived(null, new SaiFrameIncomingEventArgs(frame));
}
}
else if (_seqNoManager.IsBeyondRange(frame.SequenceNo))
{
throw new Exception(string.Format("检测到丢包，当前确认序号={0}，收到的发送序号={1}。",
_seqNoManager.AckSeq, frame.SequenceNo));
}
else
{
// 序号值为旧值，丢弃即可。
}
}
catch (System.Exception ex)
{
LogUtility.Error(string.Format("Sai: {0} \r\n{1}", _rsspEndPoint.ID, ex));
this.Disconnect(MaslErrorCode.NotDefined, 0);
}
}
public static SaiFrame Parse(byte[] bytes)
{
SaiFrame theFrame = null;
var theFrameType = (SaiFrameType)bytes[0];
if (theFrameType == SaiFrameType.TTS_OffsetStart)
{
theFrame = new SaiTtsFrameOffsetStart();
}
else if (theFrameType == SaiFrameType.TTS_OffsetAnswer1)
{
theFrame = new SaiTtsFrameOffsetAnswer1();
}
else if (theFrameType == SaiFrameType.TTS_OffsetAnswer2)
{
theFrame = new SaiTtsFrameOffsetAnswer2();
}
else if (theFrameType == SaiFrameType.TTS_OffsetEstimate)
{
theFrame = new SaiTtsFrameEstimate();
}
else if (theFrameType == SaiFrameType.TTS_OffsetEnd)
{
theFrame = new SaiTtsFrameOffsetEnd();
}
else if (theFrameType == SaiFrameType.TTS_AppData)
{
theFrame = new SaiTtsFrameAppData();
}
else if (theFrameType == SaiFrameType.EC_Start)
{
theFrame = new SaiEcFrameStart();
}
else if (theFrameType == SaiFrameType.EC_AppData)
{
theFrame = new SaiEcFrameApplication();
}
else if (theFrameType == SaiFrameType.EC_AppDataAskForAck)
{
theFrame = new SaiEcFrameAskForAck();
}
else if (theFrameType == SaiFrameType.EC_AppDataAcknowlegment)
{
theFrame = new SaiEcFrameAcknowlegment();
}
else
{
throw new InvalidOperationException(string.Format("无法解析指定的Sai帧，不可识别的类型{0}。", theFrameType));
}
theFrame.ParseBytes(bytes);
return(theFrame);
}
/// <summary>
/// 计算指定Sai协议帧的时延。（单位：10毫秒）
/// </summary>
/// <param name="saiFrame"></param>
/// <returns></returns>
public long CalcTimeDelay(SaiFrame saiFrame)
{
if (SaiFrame.IsEcFrame(saiFrame.FrameType))
{
return(this.CalcEcTimeDelay(saiFrame as SaiEcFrame));
}
else if (SaiFrame.IsTtsFrame(saiFrame.FrameType))
{
return(this.CalcTtsTimeDelay(saiFrame as SaiTtsFrame));
}
else
{
throw new InvalidOperationException("指定的SaiFrame不可识别，无法计算时延。");
}
}
public void HandleFrame(SaiFrame saiFrame)
{
if (SaiFrame.IsEcFrame(saiFrame.FrameType))
{
this.HandleEcFrame(saiFrame as SaiEcFrame);
}
else if (SaiFrame.IsTtsFrame(saiFrame.FrameType))
{
this.HandleTtsFrame(saiFrame as SaiTtsFrame);
}
else
{
throw new NotImplementedException("指定的SaiFrame不可识别，SaiState无法处理。");
}
}
private bool CheckFrame(SaiFrame saiFrame)
{
if (this.Connected)
{
return(_seqNoManager.IsExpected(saiFrame.SequenceNo));
}
else
{
if (saiFrame.FrameType == SaiFrameType.EC_Start ||
saiFrame.FrameType == SaiFrameType.TTS_OffsetStart ||
saiFrame.FrameType == SaiFrameType.TTS_OffsetAnswer1)
{
return(true);
}
else
{
return(_seqNoManager.IsExpected(saiFrame.SequenceNo));
}
}
}
void ISaiFrameTransport.SendSaiFrame(SaiFrame saiFrame)
{
var bytes = saiFrame.GetBytes();
_maslConnection.SendUserData(bytes);
}
