private void CameraReceiverMethod()
{
byte[] framedata = new byte[1];
var responseCameraFrame = new ResponseCameraFrame();
while (!RequestedStop)
{
try
{
var responseBytes = new byte[responseCameraFrame.GetResponseLength()];
// Receive the first part of the frame. This part contains the informations like height, width or length
Receive(_socket, responseBytes, responseBytes.Length);
try
{
responseCameraFrame.FromByteArray(responseBytes);
}
catch (InvalidOperationException) // Error while receiving one frame. Close camera server
{
RequestedStop = true;
TxtCommunication.SendCommand(new CommandStopCamera(), new ResponseStopCamera());
DisconnectFromCameraServerMethod();
break;
}
// Use the existing framedata object and resize if needed
if (framedata.Length < responseCameraFrame.FrameSizeCompressed + 2)
{
Array.Resize(ref framedata, responseCameraFrame.FrameSizeCompressed + 2);
}
// Receive the second part of the frame. This part contains the compressed JPEG data
Receive(_socket, framedata, responseCameraFrame.FrameSizeCompressed);
// Add the missing EOI (End of image) tag
framedata[framedata.Length - 2] = 0xFF;
framedata[framedata.Length - 1] = 0xD9;
// Store the received frame in the responseCameraFrame object
responseCameraFrame.FrameData = framedata;
// Process the received frame in another thread queue so that we can continue receiving frames
ReceivedFrames.Enqueue(responseCameraFrame);
_frameProcessingTaskQueue.DoWorkInQueue(() =>
{
if (!ReceivedFrames.IsEmpty)
{
ResponseCameraFrame frame;
if (ReceivedFrames.TryDequeue(out frame) && !RequestedStop)
{
FrameReceivedEventArgs eventArgs = new FrameReceivedEventArgs(framedata, responseCameraFrame.FrameSizeCompressed + 2);
FrameReceived?.Invoke(this, eventArgs);
}
}
}, false);
// Send an acknowledge
_socket.Send(BitConverter.GetBytes(TxtInterface.AcknowledgeIdCameraOnlineFrame));
}
catch (Exception)
{
}
}
}
public void ProcessReceivedFrames(IFrame frame)
{
// Add frame to the list of history
ReceivedFrames.Add(frame);
switch (State)
{
case StreamState.Idle:
if (frame.Type == FrameType.Headers)
{
State = StreamState.Open;
}
else if (frame.Type == FrameType.PushPromise)
{
State = StreamState.ReservedRemote;
}
// else if (frame.Type == FrameType.Priority)
// ;
// else
// ;
break;
case StreamState.ReservedLocal:
if (frame.Type == FrameType.RstStream)
{
State = StreamState.Closed;
}
break;
case StreamState.HalfClosedRemote:
if (frame.Type == FrameType.RstStream)
{
State = StreamState.Closed;
}
break;
case StreamState.Open:
if (frame.IsEndStream)
{
State = StreamState.HalfClosedRemote;
}
if (frame.Type == FrameType.RstStream)
{
State = StreamState.Closed;
}
break;
case StreamState.ReservedRemote:
if (frame.Type == FrameType.Headers)
{
State = StreamState.HalfClosedLocal;
}
else if (frame.Type == FrameType.RstStream)
{
State = StreamState.Closed;
}
break;
case StreamState.HalfClosedLocal:
if (frame.IsEndStream || frame.Type == FrameType.RstStream)
{
State = StreamState.Closed;
}
break;
}
// Server has cleared up more window space
// Add more to the available window
if (frame.Type == FrameType.WindowUpdate)
{
var windowUpdateFrame = (WindowUpdateFrame)frame;
flowControlStateManager.IncreaseWindowSize(StreamIdentifer, windowUpdateFrame.WindowSizeIncrement);
}
// Raise the event
OnFrameReceived?.Invoke(frame);
}
