/// build the capture graph for grabber.
private void SetupGraph(DsDevice dev, int iWidth, int iHeight, short iBPP, Control hControl)
{
int hr;
ISampleGrabber sampGrabber = null;
IBaseFilter capFilter = null;
IPin pCaptureOut = null;
IPin pSampleIn = null;
IPin pRenderIn = null;
// Get the graphbuilder object
m_graphBuilder = new FilterGraph() as IFilterGraph2;
try
{
#if DEBUG
m_rot = new DsROTEntry(m_graphBuilder);
#endif
// add the video input device
hr = m_graphBuilder.AddSourceFilterForMoniker(dev.Mon, null, dev.Name, out capFilter);
DsError.ThrowExceptionForHR(hr);
// Find the still pin
m_pinStill = DsFindPin.ByCategory(capFilter, PinCategory.Still, 0);
// Didn't find one. Is there a preview pin?
if (m_pinStill == null)
{
m_pinStill = DsFindPin.ByCategory(capFilter, PinCategory.Preview, 0);
}
// Still haven't found one. Need to put a splitter in so we have
// one stream to capture the bitmap from, and one to display. Ok, we
// don't *have* to do it that way, but we are going to anyway.
if (m_pinStill == null)
{
IPin pRaw = null;
IPin pSmart = null;
// There is no still pin
m_VidControl = null;
// Add a splitter
IBaseFilter iSmartTee = (IBaseFilter) new SmartTee();
try
{
hr = m_graphBuilder.AddFilter(iSmartTee, "SmartTee");
DsError.ThrowExceptionForHR(hr);
// Find the find the capture pin from the video device and the
// input pin for the splitter, and connnect them
pRaw = DsFindPin.ByCategory(capFilter, PinCategory.Capture, 0);
pSmart = DsFindPin.ByDirection(iSmartTee, PinDirection.Input, 0);
hr = m_graphBuilder.Connect(pRaw, pSmart);
DsError.ThrowExceptionForHR(hr);
// Now set the capture and still pins (from the splitter)
m_pinStill = DsFindPin.ByName(iSmartTee, "Preview");
pCaptureOut = DsFindPin.ByName(iSmartTee, "Capture");
// If any of the default config items are set, perform the config
// on the actual video device (rather than the splitter)
if (iHeight + iWidth + iBPP > 0)
{
SetConfigParms(pRaw, iWidth, iHeight, iBPP);
}
}
finally
{
if (pRaw != null)
{
Marshal.ReleaseComObject(pRaw);
}
if (pRaw != pSmart)
{
Marshal.ReleaseComObject(pSmart);
}
if (pRaw != iSmartTee)
{
Marshal.ReleaseComObject(iSmartTee);
}
}
}
else
{
// Get a control pointer (used in Click())
m_VidControl = capFilter as IAMVideoControl;
pCaptureOut = DsFindPin.ByCategory(capFilter, PinCategory.Capture, 0);
// If any of the default config items are set
if (iHeight + iWidth + iBPP > 0)
{
SetConfigParms(m_pinStill, iWidth, iHeight, iBPP);
}
}
// Get the SampleGrabber interface
sampGrabber = new SampleGrabber() as ISampleGrabber;
// Configure the sample grabber
IBaseFilter baseGrabFlt = sampGrabber as IBaseFilter;
ConfigureSampleGrabber(sampGrabber);
pSampleIn = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Input, 0);
// Get the default video renderer
IBaseFilter pRenderer = new VideoRendererDefault() as IBaseFilter;
hr = m_graphBuilder.AddFilter(pRenderer, "Renderer");
DsError.ThrowExceptionForHR(hr);
pRenderIn = DsFindPin.ByDirection(pRenderer, PinDirection.Input, 0);
// Add the sample grabber to the graph
hr = m_graphBuilder.AddFilter(baseGrabFlt, "Ds.NET Grabber");
DsError.ThrowExceptionForHR(hr);
if (m_VidControl == null)
{
// Connect the Still pin to the sample grabber
hr = m_graphBuilder.Connect(m_pinStill, pSampleIn);
DsError.ThrowExceptionForHR(hr);
// Connect the capture pin to the renderer
hr = m_graphBuilder.Connect(pCaptureOut, pRenderIn);
DsError.ThrowExceptionForHR(hr);
}
else
{
// Connect the capture pin to the renderer
hr = m_graphBuilder.Connect(pCaptureOut, pRenderIn);
DsError.ThrowExceptionForHR(hr);
// Connect the Still pin to the sample grabber
hr = m_graphBuilder.Connect(m_pinStill, pSampleIn);
DsError.ThrowExceptionForHR(hr);
}
// Learn the video properties
SaveSizeInfo(sampGrabber);
ConfigVideoWindow(hControl);
// Start the graph
IMediaControl mediaCtrl = m_graphBuilder as IMediaControl;
hr = mediaCtrl.Run();
DsError.ThrowExceptionForHR(hr);
}
finally
{
if (sampGrabber != null)
{
Marshal.ReleaseComObject(sampGrabber);
sampGrabber = null;
}
if (pCaptureOut != null)
{
Marshal.ReleaseComObject(pCaptureOut);
pCaptureOut = null;
}
if (pRenderIn != null)
{
Marshal.ReleaseComObject(pRenderIn);
pRenderIn = null;
}
if (pSampleIn != null)
{
Marshal.ReleaseComObject(pSampleIn);
pSampleIn = null;
}
}
}
private void BuildGraph(DirectShowLib.DsDevice dsDevice)
{
int hr = 0;
pGraph = new FilterGraph() as IFilterGraph2;
//graph builder
ICaptureGraphBuilder2 pBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
try
{
hr = pBuilder.SetFiltergraph(pGraph);
DsError.ThrowExceptionForHR(hr);
// Add camera
IBaseFilter camera;
//hr = pGraph.FindFilterByName(dsDevice.Name, out camera);
hr = ((IFilterGraph2)pGraph).AddSourceFilterForMoniker(dsDevice.Mon, null, dsDevice.Name, out camera);
DsError.ThrowExceptionForHR(hr);
hr = pGraph.AddFilter(camera, "camera");
DsError.ThrowExceptionForHR(hr);
// Set format for camera
AMMediaType pmt = new AMMediaType();
pmt.majorType = MediaType.Video;
pmt.subType = MediaSubType.MJPG;
pmt.formatType = FormatType.VideoInfo;
pmt.fixedSizeSamples = true;
pmt.formatSize = 88;
pmt.sampleSize = 2764800;
pmt.temporalCompression = false;
VideoInfoHeader format = new VideoInfoHeader();
format.SrcRect = new DsRect();
format.TargetRect = new DsRect();
format.BitRate = 663552000;
format.AvgTimePerFrame = 333333;
format.BmiHeader = new BitmapInfoHeader();
format.BmiHeader.Size = 40;
format.BmiHeader.Width = 1280;
format.BmiHeader.Height = 720;
format.BmiHeader.Planes = 1;
format.BmiHeader.BitCount = 24;
format.BmiHeader.Compression = 1196444237;
format.BmiHeader.ImageSize = 2764800;
pmt.formatPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(format));
Marshal.StructureToPtr(format, pmt.formatPtr, false);
hr = ((IAMStreamConfig)DsFindPin.ByCategory(camera, PinCategory.Capture, 0)).SetFormat(pmt);
//hr = ((IAMStreamConfig)GetPin(pUSB20Camera, "Capture")).SetFormat(pmt);
DsUtils.FreeAMMediaType(pmt);
DsError.ThrowExceptionForHR(hr);
//add MJPG Decompressor
IBaseFilter pMJPGDecompressor = (IBaseFilter)new MjpegDec();
hr = pGraph.AddFilter(pMJPGDecompressor, "MJPG Decompressor");
DsError.ThrowExceptionForHR(hr);
//add color space converter
IBaseFilter pColorSpaceConverter = (IBaseFilter)new Colour();
hr = pGraph.AddFilter(pColorSpaceConverter, "Color space converter");
DsError.ThrowExceptionForHR(hr);
// Connect camera and MJPEG Decomp
//hr = pGraph.ConnectDirect(GetPin(pUSB20Camera, "Capture"), GetPin(pMJPGDecompressor, "XForm In"), null);
hr = pGraph.ConnectDirect(DsFindPin.ByCategory(camera, PinCategory.Capture, 0), DsFindPin.ByName(pMJPGDecompressor, "XForm In"), null);
DsError.ThrowExceptionForHR(hr);
// Connect MJPG Decomp and color space converter
hr = pGraph.ConnectDirect(DsFindPin.ByName(pMJPGDecompressor, "XForm Out"), DsFindPin.ByName(pColorSpaceConverter, "Input"), null);
DsError.ThrowExceptionForHR(hr);
//add SampleGrabber
//IBaseFilter pSampleGrabber = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_SampleGrabber));
//hr = pGraph.AddFilter(pSampleGrabber, "SampleGrabber");
IBaseFilter sampleGrabber = new SampleGrabber() as IBaseFilter;
hr = pGraph.AddFilter(sampleGrabber, "Sample grabber");
DsError.ThrowExceptionForHR(hr);
// Configure the samplegrabber
AMMediaType pSampleGrabber_pmt = new AMMediaType();
pSampleGrabber_pmt.majorType = MediaType.Video;
pSampleGrabber_pmt.subType = MediaSubType.ARGB32;
pSampleGrabber_pmt.formatType = FormatType.VideoInfo;
pSampleGrabber_pmt.fixedSizeSamples = true;
pSampleGrabber_pmt.formatSize = 88;
pSampleGrabber_pmt.sampleSize = 3686400;
pSampleGrabber_pmt.temporalCompression = false;
VideoInfoHeader pSampleGrabber_format = new VideoInfoHeader();
pSampleGrabber_format.SrcRect = new DsRect();
pSampleGrabber_format.TargetRect = new DsRect();
pSampleGrabber_format.BitRate = 884736885;
pSampleGrabber_format.AvgTimePerFrame = 333333;
pSampleGrabber_format.BmiHeader = new BitmapInfoHeader();
pSampleGrabber_format.BmiHeader.Size = 40;
pSampleGrabber_format.BmiHeader.Width = 1280;
pSampleGrabber_format.BmiHeader.Height = 720;
pSampleGrabber_format.BmiHeader.Planes = 1;
pSampleGrabber_format.BmiHeader.BitCount = 32;
//pSampleGrabber_format.BmiHeader.Compression = 1196444237;
pSampleGrabber_format.BmiHeader.ImageSize = 3686400;
pSampleGrabber_pmt.formatPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(pSampleGrabber_format));
Marshal.StructureToPtr(pSampleGrabber_format, pSampleGrabber_pmt.formatPtr, false);
hr = ((ISampleGrabber)sampleGrabber).SetMediaType(pSampleGrabber_pmt);
DsError.ThrowExceptionForHR(hr);
//connect MJPG dec and SampleGrabber
//hr = pGraph.ConnectDirect(GetPin(pMJPGDecompressor, "XForm Out"), GetPin(pSampleGrabber, "Input"), null);
hr = pGraph.ConnectDirect(DsFindPin.ByName(pColorSpaceConverter, "XForm Out"), DsFindPin.ByName(sampleGrabber, "Input"), null);
DsError.ThrowExceptionForHR(hr);
//set callback
hr = ((ISampleGrabber)sampleGrabber).SetCallback(this, 1);
DsError.ThrowExceptionForHR(hr);
}
finally
{
// Clean this mess up!
}
}
