internal override Bitmap TakePicture(SynchronizedPictureBox pictureControl)
{
if (m_callbackCompleted != null)
{
return(null);
}
m_pictureControl = pictureControl;
m_takePictureEnd = false;
DsDevice cameraDevice = DsDevice.GetDevicesOfCat(FilterCategory.VideoInputDevice)[m_cameraDeviceIndex];
IFilterGraph2 filterGraph = null;
IBaseFilter cam = null; IPin camCapture = null; // cam
ISampleGrabber sg = null; IPin sgIn = null; // samplegrabber
try {
// setup filterGraph & connect camera
filterGraph = (IFilterGraph2) new FilterGraph();
DsError.ThrowExceptionForHR(filterGraph.AddSourceFilterForMoniker(cameraDevice.Mon, null, cameraDevice.Name, out cam));
// setup smarttee and connect so that cam(PinCategory.Capture)->st(PinDirection.Input)
camCapture = DsFindPin.ByCategory(cam, PinCategory.Capture, 0); // output
ConfStreamDimensions((IAMStreamConfig)camCapture);
// connect Camera output to SampleGrabber input
sg = (ISampleGrabber) new SampleGrabber();
// configure
AMMediaType media = new AMMediaType();
try {
media.majorType = MediaType.Video;
media.subType = BPP2MediaSubtype(m_configuration.BPP); // this will ask samplegrabber to do convertions for us
media.formatType = FormatType.VideoInfo;
DsError.ThrowExceptionForHR(sg.SetMediaType(media));
} finally {
DsUtils.FreeAMMediaType(media);
media = null;
}
DsError.ThrowExceptionForHR(sg.SetCallback(this, 1)); // 1 = BufferCB
DsError.ThrowExceptionForHR(filterGraph.AddFilter((IBaseFilter)sg, "SG"));
sgIn = DsFindPin.ByDirection((IBaseFilter)sg, PinDirection.Input, 0); // input
DsError.ThrowExceptionForHR(filterGraph.Connect(camCapture, sgIn));
GetSizeInfo(sg);
// wait until timeout - or picture has been taken
if (m_callbackCompleted == null)
{
m_callbackCompleted = new ManualResetEvent(false);
// start filter
DsError.ThrowExceptionForHR(((IMediaControl)filterGraph).Run());
m_callbackState = 5;
if (m_pictureControl != null)
{
m_callbackCompleted.WaitOne();
}
else
{
if (!m_callbackCompleted.WaitOne(15000, false))
{
throw new Exception(); //"Timeout while waiting for Picture");
}
}
return(m_capturedBitmap);
}
else
{
return(null);
}
} finally {
// release allocated objects
if (m_callbackCompleted != null)
{
m_callbackCompleted.Close();
m_callbackCompleted = null;
}
if (sgIn != null)
{
Marshal.ReleaseComObject(sgIn);
sgIn = null;
}
if (sg != null)
{
Marshal.ReleaseComObject(sg);
sg = null;
}
if (camCapture != null)
{
Marshal.ReleaseComObject(camCapture);
camCapture = null;
}
if (cam != null)
{
Marshal.ReleaseComObject(cam);
cam = null;
}
if (filterGraph != null)
{
try {
((IMediaControl)filterGraph).Stop();
} catch (Exception) { }
Marshal.ReleaseComObject(filterGraph);
filterGraph = null;
}
m_capturedBitmap = null;
m_callbackCompleted = null;
}
}
internal abstract Bitmap TakePicture(SynchronizedPictureBox pictureControl);
