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);
}
public void Test1()
{
var frameInital = new SaiTtsFrameOffsetAnswer2();
frameInital.SequenceNo = 100;
frameInital.SenderTimestamp = 1000;
frameInital.SenderLastRecvTimestamp = 900;
frameInital.ReceiverLastSendTimestamp = 800;
var bytes = frameInital.GetBytes();
var actual = SaiFrame.Parse(bytes) as SaiTtsFrameOffsetAnswer2;
Assert.AreEqual(frameInital.FrameType, actual.FrameType);
Assert.AreEqual(frameInital.SequenceNo, actual.SequenceNo);
Assert.AreEqual(frameInital.SenderTimestamp, actual.SenderTimestamp);
Assert.AreEqual(frameInital.SenderLastRecvTimestamp, actual.SenderLastRecvTimestamp);
Assert.AreEqual(frameInital.ReceiverLastSendTimestamp, actual.ReceiverLastSendTimestamp);
}
protected override void HandleTtsOffsetAnswer1Frame(SaiTtsFrameOffsetAnswer1 answer1)
{
// 收到Answer1，停止计时器
LogUtility.Info(string.Format("{0}: 收到的OffsetAnswer1，停止Tint_start计时器。", this.Context.RsspEP.ID));
this.Context.StopHandshakeTimer();
// 更新时间戳
this.Calculator.InitTimestamp2 = this.TTS.LocalLastRecvTimeStamp;
this.Calculator.ResTimestamp1 = answer1.SenderLastRecvTimestamp;
this.Calculator.ResTimestamp2 = answer1.SenderTimestamp;
// 发起方计算偏移
this.Calculator.EstimateInitOffset();
// 记录日志
LogUtility.Info(string.Format("{0}: 发起方估算时钟偏移，OffsetMin = {1}, OffsetMax = {2}",
this.Context.RsspEP.ID, this.Calculator.InitiatorMinOffset, this.Calculator.InitiatorMaxOffset));
// 发送OffsetAnswer2报文
var seq = (ushort)this.Context.SeqNoManager.GetAndUpdateSendSeq();
var answer2 = new SaiTtsFrameOffsetAnswer2(seq,
TripleTimestamp.CurrentTimestamp,
this.TTS.RemoteLastSendTimestamp,
this.TTS.LocalLastRecvTimeStamp);
this.Context.NextLayer.SendUserData(answer2.GetBytes());
LogUtility.Info(string.Format("{0}: 发送OffsetAnswer2。", this.Context.RsspEP.ID));
// 启动计时器,等待OffsetEst报文
LogUtility.Info(string.Format("{0}: 启动Tint_start计时器，等待OffsetEst报文", this.Context.RsspEP.ID));
this.Context.StartHandshakeTimer();
// 更新状态。
this.Context.CurrentState = new TtsWaitingforEstimateState(this);
}
protected virtual void HandleTtsOffsetAnswer2Frame(SaiTtsFrameOffsetAnswer2 frame)
{
LogUtility.Error(string.Format("{0}: {1}.{2} not implement!",
this.Context.RsspEP.ID, this.GetType().Name,
new StackFrame(0).GetMethod().Name.Split('.').Last()));
}
