/// <summary>
/// Some IP cameras, like AirLink, claim that boundary is "myboundary",
/// when it is really "--myboundary". This corrects the issue.
/// </summary>
/// <param name="streamParser"></param>
public void FixMalformedBoundary(MJPEGStreamParser streamParser)
{
byte[] content = streamParser.Content;
int boundaryIndex = streamParser.FindImageBoundary();
if (boundaryIndex != -1)
{
for (int i = boundaryIndex - 1; i >= 0; i--)
{
char ch = (char)content[i];
if (ch == '\n' || ch == '\r')
{
break;
}
Prepend(ch);
}
IsChecked = true;
}
}
private void WorkerThread()
{
while (!IsStopRequested)
{
MJPEGStreamParser parser;
Boundary boundary;
WebResponse response = null;
// reset reload event
_reloadEvent.Reset();
try
{
response = GetResponse();
boundary = Boundary.FromResponse(response);
parser = new MJPEGStreamParser(boundary, JPEG_HEADER_BYTES);
using (Stream stream = GetResponseStream(response))
{
while (!IsStopRequested && !IsReloadRequested)
{
_bytesReceived += parser.Read(stream);
if (boundary.HasValue && !boundary.IsChecked)
{
boundary.FixMalformedBoundary(parser);
}
if (boundary.IsValid)
{
parser.DetectFrame();
if (parser.HasFrame)
{
_framesReceived++;
if (NewFrame != null && !IsStopRequested)
{
using (Bitmap frame = parser.GetFrame())
{
NewFrame(this, new NewFrameEventArgs(frame));
}
parser.RemoveFrame();
}
}
}
}
}
}
catch (ApplicationException)
{
// do nothing for Application Exception, which we raised on our own
// wait for a while before the next try
Thread.Sleep(250);
}
catch (ThreadAbortException)
{
break;
}
catch (Exception exception)
{
// provide information to clients
if (VideoSourceError != null)
{
VideoSourceError(this, new VideoSourceErrorEventArgs(exception.Message, exception));
}
// wait for a while before the next try
Thread.Sleep(250);
}
finally
{
// close response
if (response != null)
{
response.Close();
}
}
if (IsStopRequested)
{
break;
}
}
if (PlayingFinished != null)
{
PlayingFinished(this, ReasonToFinishPlaying.StoppedByUser);
}
}
