/// <summary>
/// Retrieves image using the _JpegVideoSource
/// If succes converts the Jpeg to a bitmap and calls routine to draw it
/// If no image is retrieved a routine to draw a error message is called
/// No image means that the system has no recorded images from that camera
/// </summary>
/// <param name="time"></param>
private void ShowImageFrom(DateTime time)
{
JPEGData jpegData = _jpegVideoSource.GetAtOrBefore(time) as JPEGData;
if (jpegData != null)
{
MemoryStream ms = new MemoryStream(jpegData.Bytes);
_cameraBitmap = new Bitmap(ms);
Drawgraphics();
ms.Dispose();
}
else
{
DrawNoGraphics();
}
}
private void JPEGFetchThread()
{
bool errorRecovery = false;
while (!_stop)
{
if (_performCloseVideoSource)
{
if (_jpegVideoSource != null)
{
_jpegVideoSource.Close();
_jpegVideoSource = null;
}
_performCloseVideoSource = false;
}
if (_newlySelectedItem != null)
{
_selectedItem = _newlySelectedItem;
_jpegVideoSource = new JPEGVideoSource(_selectedItem);
if (checkBoxAspect.Checked)
{
// Keeping aspect ratio can only work when the Media Toolkit knows the actual displayed area
_jpegVideoSource.Width = pictureBox.Width;
_jpegVideoSource.Height = pictureBox.Height;
_jpegVideoSource.SetKeepAspectRatio(checkBoxAspect.Checked, checkBoxFill.Checked); // Must be done before Init
}
try
{
_jpegVideoSource.Init();
JPEGData jpegData = _currentShownTime == DateTime.MinValue ? _jpegVideoSource.GetBegin() : _jpegVideoSource.GetAtOrBefore(_currentShownTime) as JPEGData;
if (jpegData != null)
{
_requestInProgress = true;
ShowJPEG(jpegData);
}
else
{
ShowError(""); // Clear any error messages
}
_newlySelectedItem = null;
errorRecovery = false;
}
catch (Exception ex)
{
if (ex is CommunicationMIPException)
{
ShowError("Connection lost to server ...");
}
else
{
ShowError(ex.Message);
}
errorRecovery = true;
_jpegVideoSource = null;
_newlySelectedItem = _selectedItem; // Redo the Initialization
}
}
if (errorRecovery)
{
Thread.Sleep(3000);
continue;
}
if (_setNewResolution && _jpegVideoSource != null && _requestInProgress == false)
{
try
{
_jpegVideoSource.Width = _newWidth;
_jpegVideoSource.Height = _newHeight;
_jpegVideoSource.SetWidthHeight();
_setNewResolution = false;
JPEGData jpegData;
jpegData = _jpegVideoSource.GetAtOrBefore(_currentShownTime) as JPEGData;
if (jpegData != null)
{
_requestInProgress = true;
_currentShownTime = DateTime.MinValue;
ShowJPEG(jpegData);
}
}
catch (Exception ex)
{
if (ex is CommunicationMIPException)
{
ShowError("Connection lost to recorder...");
}
else
{
ShowError(ex.Message);
}
errorRecovery = true;
_jpegVideoSource = null;
_newlySelectedItem = _selectedItem; // Redo the Initialization
}
}
if (_requestInProgress == false && _jpegVideoSource != null && _nextCommand != MyPlayCommand.None)
{
JPEGData jpegData = null;
try
{
switch (_nextCommand)
{
case MyPlayCommand.Start:
jpegData = _jpegVideoSource.GetBegin();
break;
case MyPlayCommand.NextFrame:
jpegData = _jpegVideoSource.GetNext() as JPEGData;
break;
case MyPlayCommand.NextSequence:
jpegData = _jpegVideoSource.GetNextSequence();
break;
case MyPlayCommand.PrevFrame:
jpegData = _jpegVideoSource.GetPrevious();
break;
case MyPlayCommand.PrevSequence:
jpegData = _jpegVideoSource.GetPreviousSequence();
break;
case MyPlayCommand.End:
jpegData = _jpegVideoSource.GetEnd();
break;
}
} catch (Exception ex)
{
if (ex is CommunicationMIPException)
{
ShowError("Connection lost to recorder...");
}
else
{
ShowError(ex.Message);
}
errorRecovery = true;
_jpegVideoSource = null;
_newlySelectedItem = _selectedItem; // Redo the Initialization
}
if (jpegData != null)
{
_requestInProgress = true;
ShowJPEG(jpegData);
}
_nextCommand = MyPlayCommand.None;
}
if (_nextToFetchTime != DateTime.MinValue && _requestInProgress == false && _jpegVideoSource != null)
{
bool willResultInSameFrame = false;
// Lets validate if we are just asking for the same frame
if (_currentTimeInformation != null)
{
if (_currentTimeInformation.PreviousTime < _nextToFetchTime &&
_currentTimeInformation.NextTime > _nextToFetchTime)
{
willResultInSameFrame = true;
}
}
if (willResultInSameFrame)
{
Debug.WriteLine("Now Fetch ignored: " + _nextToFetchTime.ToLongTimeString() + " - nextToFetch=" + _nextToFetchTime.ToLongTimeString());
// Same frame -> Ignore request
_requestInProgress = false;
_nextToFetchTime = DateTime.MinValue;
}
else
{
Debug.WriteLine("Now Fetch: " + _nextToFetchTime.ToLongTimeString());
DateTime time = _nextToFetchTime;
_nextToFetchTime = DateTime.MinValue;
try
{
DateTime localTime = time.Kind == DateTimeKind.Local ? time : time.ToLocalTime();
DateTime utcTime = time.Kind == DateTimeKind.Local ? time.ToUniversalTime() : time;
BeginInvoke(
new MethodInvoker(delegate() { textBoxAsked.Text = localTime.ToString("yyyy-MM-dd HH:mm:ss.fff"); }));
JPEGData jpegData;
jpegData = _jpegVideoSource.GetAtOrBefore(utcTime) as JPEGData;
if (jpegData == null && _mode == PlaybackPlayModeData.Stop)
{
jpegData = _jpegVideoSource.GetNearest(utcTime) as JPEGData;
}
if (_mode == PlaybackPlayModeData.Reverse)
{
while (jpegData != null && jpegData.DateTime > utcTime)
{
jpegData = _jpegVideoSource.GetPrevious();
}
}
else if (_mode == PlaybackPlayModeData.Forward)
{
if (jpegData != null && jpegData.DateTime < utcTime)
{
jpegData = _jpegVideoSource.Get(utcTime) as JPEGData;
}
}
if (jpegData != null)
{
_requestInProgress = true;
ShowJPEG(jpegData);
}
}
catch (Exception ex)
{
if (ex is CommunicationMIPException)
{
ShowError("Connection lost to server ...");
}
else
{
ShowError(ex.Message);
}
errorRecovery = true;
_jpegVideoSource = null;
_newlySelectedItem = _selectedItem; // Redo the Initialization
}
}
}
Thread.Sleep(5);
}
_fetchThread = null;
}
