StopCapture()
{
int hr;
// Are we capturing?
if (m_Capturing)
{
// disconnect segments
hr = m_pBridge.BridgeGraphs(null, null);
DsError.ThrowExceptionForHR(hr);
// stop capture graph
IMediaControl pMC = (IMediaControl)m_pCaptureGraph;
hr = pMC.Stop();
DsError.ThrowExceptionForHR(hr);
// disable capture stream (to save resources)
IAMStreamControl pSC = (IAMStreamControl)m_pCapOutput;
pSC.StartAt(NEVER, 0); // Ignore any error
m_Capturing = false;
}
}
StartCapture()
{
int hr;
if (m_DeviceSelected)
{
if (m_strFile != null)
{
// re-enable capture stream
IAMStreamControl pSC = (IAMStreamControl)m_pCapOutput;
// immediately!
pSC.StartAt(null, 0); // Ignore any error
// start capture graph
IMediaControl pMC = (IMediaControl)m_pCaptureGraph;
hr = pMC.Run();
DsError.ThrowExceptionForHR(hr);
hr = m_pBridge.BridgeGraphs(m_pSourceGraphSinkFilter, m_pCaptureGraphSourceFilter);
DsError.ThrowExceptionForHR(hr);
// If we make it here, we are capturing
m_Capturing = true;
}
else
{
throw new Exception("File name not specified");
}
}
else
{
throw new Exception("Device not selected");
}
}
private void TestStart()
{
int hr;
AMStreamInfo pInfo;
hr = m_sc.StartAt(123, 456);
DsError.ThrowExceptionForHR(hr);
hr = m_sc.GetInfo(out pInfo);
Debug.Assert(pInfo.tStart == 123 && pInfo.dwStartCookie == 456, "start");
}
SelectDevice(DsDevice dev, IntPtr hwnd)
{
int hr;
IBaseFilter pfDevice = null;
ICaptureGraphBuilder2 pBuilder = null;
// release any leftovers
ReleaseSelectMembers();
try
{
// create source graph and add sink filter
m_pSourceGraph = (IGraphBuilder) new FilterGraph();
m_rot1 = new DsROTEntry(m_pSourceGraph);
m_pBridge = (IGMFBridgeController) new GMFBridgeController();
// init to video-only, in discard mode (ie when source graph
// is running but not connected, buffers are discarded at the bridge)
hr = m_pBridge.AddStream(true, eFormatType.MuxInputs, true);
DsError.ThrowExceptionForHR(hr);
// Add the requested device
hr = ((IFilterGraph2)m_pSourceGraph).AddSourceFilterForMoniker(dev.Mon, null, dev.Name, out pfDevice);
DsError.ThrowExceptionForHR(hr);
// Add the sink filter to the source graph
hr = m_pBridge.InsertSinkFilter(m_pSourceGraph, out m_pSourceGraphSinkFilter);
DsError.ThrowExceptionForHR(hr);
// use capture graph builder to render preview
pBuilder = (ICaptureGraphBuilder2) new CaptureGraphBuilder2();
// Init the CaptureGraphBuilder2
hr = pBuilder.SetFiltergraph(m_pSourceGraph);
DsError.ThrowExceptionForHR(hr);
// Connect the filters together to allow preview
hr = pBuilder.RenderStream(PinCategory.Preview, MediaType.Video, pfDevice, null, null);
DsError.ThrowExceptionForHR(hr);
// connect capture output to the pseudo-sink filter,
// where it will be discarded until required
hr = pBuilder.RenderStream(PinCategory.Capture, MediaType.Video, pfDevice, null, m_pSourceGraphSinkFilter);
DsError.ThrowExceptionForHR(hr);
// turn off capture stream if possible except when capturing
hr = pBuilder.FindPin(pfDevice, PinDirection.Output, PinCategory.Capture, MediaType.Video, false, 0, out m_pCapOutput);
if (hr >= 0)
{
IAMStreamControl pSC = (IAMStreamControl)m_pCapOutput;
pSC.StartAt(NEVER, 0); // Ignore any error
}
ConfigureVideo(hwnd);
IMediaControl pMC = (IMediaControl)m_pSourceGraph;
hr = pMC.Run();
DsError.ThrowExceptionForHR(hr);
// If we made it here, the device is selected
m_DeviceSelected = true;
}
catch
{
ReleaseSelectMembers();
throw;
}
finally
{
if (pBuilder != null)
{
Marshal.ReleaseComObject(pBuilder);
}
if (pfDevice != null)
{
Marshal.ReleaseComObject(pfDevice);
}
}
}