private void NewFrameDelegateMethod(SampleGrabberBufferCBEventArgs e)
{
if (_stopFlag)
{
return;
}
try
{
if (pnScreen == null)
{
return;
}
if (_frameStopped)
{
return;
}
if (_frameBitmap == null || _frameBitmap.PixelWidth != e.Width || _frameBitmap.PixelHeight != e.Height)
{
_frameBitmap = new WriteableBitmap(e.Width, e.Height, 72, 72, PixelFormats.Bgr24, null);
pnScreen.BeginInit();
pnScreen.Source = _frameBitmap;
pnScreen.EndInit();
}
pnScreen.BeginInit();
if (pnScreen.Source == null)
{
pnScreen.Source = _frameBitmap;
}
int lineStep = (((e.Width * 24) + 31) / 32) * 4;
_frameBitmap.WritePixels(new Int32Rect(0, 0, e.Width, e.Height), e.Buffer, (int)e.BufferLen, lineStep);
pnScreen.EndInit();
}
catch
{
}
}
private void VideoCapture1_OnVideoFrameBuffer(object sender, SampleGrabberBufferCBEventArgs e)
{
try
{
if (_stopFlag)
{
return;
}
Dispatcher.BeginInvoke(new NewFrameDelegate(NewFrameDelegateMethod), e);
if (_tempBuffer == IntPtr.Zero)
{
_tempBuffer = Marshal.AllocCoTaskMem(ImageHelper.GetStrideRGB24(e.Width) * e.Height);
}
// live
if (_searchLiveData == null)
{
_searchLiveData = new FingerprintLiveData(TimeSpan.FromMilliseconds(_fragmentDuration), DateTime.Now);
_fragmentCount++;
}
long timestamp = (long)(e.SampleTime * 1000);
if (timestamp < _fragmentDuration * _fragmentCount)
{
ImageHelper.CopyMemory(_tempBuffer, e.Buffer, e.BufferLen);
// process frame to remove ignored areas
if (_ignoredAreas.Count > 0)
{
foreach (var area in _ignoredAreas)
{
if (area.Right > e.Width || area.Bottom > e.Height)
{
continue;
}
MFP.FillColor(_tempBuffer, e.Width, e.Height, area, 0);
}
}
VFPSearch.Process(_tempBuffer, e.Width, e.Height, ImageHelper.GetStrideRGB24(e.Width), TimeSpan.FromMilliseconds(timestamp), ref _searchLiveData.Data);
}
else
{
_fingerprintQueue.Enqueue(_searchLiveData);
_searchLiveData = null;
Dispatcher.BeginInvoke(new ProcessVideoDelegate(ProcessVideoDelegateMethod));
}
// overlap
if (timestamp < _fragmentDuration / 2)
{
return;
}
if (_searchLiveOverlapData == null)
{
_searchLiveOverlapData = new FingerprintLiveData(TimeSpan.FromSeconds(_fragmentDuration), DateTime.Now);
_overlapFragmentCount++;
}
if (timestamp < _fragmentDuration * _overlapFragmentCount + _fragmentDuration / 2)
{
ImageHelper.CopyMemory(_tempBuffer, e.Buffer, e.BufferLen);
VFPSearch.Process(_tempBuffer, e.Width, e.Height, ImageHelper.GetStrideRGB24(e.Width), TimeSpan.FromMilliseconds(timestamp), ref _searchLiveOverlapData.Data);
}
else
{
_fingerprintQueue.Enqueue(_searchLiveOverlapData);
_searchLiveOverlapData = null;
Dispatcher.BeginInvoke(new ProcessVideoDelegate(ProcessVideoDelegateMethod));
}
}
catch
{
}
}
