//Tear down button is clicked
public void Teardown(object sender, EventArgs e)
{
//Determine which view to control
view = (View)((Button)sender).FindForm();
//send the request message to the server
rtspModel.Send(new RtspRequest
{
RequestType = RtspRequest.RtspRequestType.TEARDOWN,
FileName = VideoName,
SessionID = sessionNum
});
//wait for the reply from the server
try
{
var response = rtspModel.Listen();
sessionNum = response.Session;
UpdateServerBox(response.ToString() + Environment.NewLine);
UpdateClientBox("New RTSP State: TEARDOWN" + Environment.NewLine);
//reset sequence number
rtspModel.CSeqNum = 1;
//disable & enable appropriate buttons
view.EnableButton(View.Buttons.Setup);
view.DisableButton(View.Buttons.Play);
view.DisableButton(View.Buttons.Pause);
view.DisableButton(View.Buttons.Teardowm);
}
catch (ArgumentException ex)
{
UpdateServerBox($"Error: {ex.Message}{Environment.NewLine}");
}
}
//communications thread for UDP socket to receive video frames
public void Communications()
{
//used to receive video frames from server
rtpModel = new RtpModel(this.ServerIP, this.ServerPort, ClientPort);
while (true)
{
//converts the video frame into an image
var currentVideoFrame = rtpModel.GetImage(ref videoFrame);
//break out of loop if video is over
if (currentVideoFrame == null)
{
view.DisableButton(View.Buttons.Pause);
break;
}
//store the video header
var videoFrameHeader = new byte[12];
Buffer.BlockCopy(videoFrame, 0, videoFrameHeader, 0, videoFrameHeader.Length);
//if packet report is checked, display packet report
if (view.IsPacketReportChecked)
{
//get sequence number
var sequenceNum = new byte[2];
Buffer.BlockCopy(videoFrameHeader, 2, sequenceNum, 0, sequenceNum.Length);
Array.Reverse(sequenceNum);
BitArray sequenceNumBits = new BitArray(sequenceNum);
int seqNumBitsStr = GetIntFromBitArray(sequenceNumBits);
//get time stamp
var timeStamp = new byte[4];
Buffer.BlockCopy(videoFrameHeader, 4, timeStamp, 0, timeStamp.Length);
Array.Reverse(timeStamp);
var timeStampBits = new BitArray(timeStamp);
var timeStampBitsStr = GetIntFromBitArray(timeStampBits);
//get payload type
var type = new byte[1];
Buffer.BlockCopy(videoFrameHeader, 1, type, 0, type.Length);
var typeBits = new BitArray(type);
typeBits.Set(7, false);
var timeBitsStr = GetIntFromBitArray(typeBits);
this.UpdateClientBox(Environment.NewLine + "Got RTP packet with SeqNum #" + seqNumBitsStr
+ ", Timestamp: " + timeStampBitsStr + " of type " + timeBitsStr + Environment.NewLine);
}
//display the image
view.SetImageBox(currentVideoFrame);
}
}
//Play button is clicked
public void Play(object sender, EventArgs e)
{
//Determine which view to control
view = (View)((Button)sender).FindForm();
//send the request message to the server
rtspModel.Send(new RtspRequest
{
RequestType = RtspRequest.RtspRequestType.PLAY,
FileName = VideoName,
SessionID = sessionNum
});
//wait for the reply from the server
try
{
var response = rtspModel.Listen();
UpdateServerBox(response.ToString() + Environment.NewLine);
//Start UDP video thread to start receiving images
if (videoTimerThread == null)
{
this.videoTimerThread = new Thread(Communications);
videoTimerThread.IsBackground = true; //to stop all threads with application is terminated
this.videoTimerThread.Start();
}
UpdateClientBox("New RTSP State: PLAYING" + Environment.NewLine);
//disable & enable appropriate buttons
view.DisableButton(View.Buttons.Play);
view.EnableButton(View.Buttons.Pause);
view.EnableButton(View.Buttons.Teardowm);
}
catch (ArgumentException ex)
{
UpdateServerBox($"Error: {ex.Message}{Environment.NewLine}");
}
}
