/// <summary> build the capture graph for grabber. </summary>
bool SetupGraph()
{
int hr;
try
{
hr = capGraph.SetFiltergraph(graphBuilder);
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
hr = graphBuilder.AddFilter(capFilter, " Video Capture Device");
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
DsUtils.ShowCapPinDialog(capGraph, capFilter, this.Handle);
AMMediaType media = new AMMediaType();
media.majorType = MediaType.Video;
media.subType = MediaSubType.RGB24;
media.formatType = FormatType.VideoInfo; // ???
hr = sampGrabber.SetMediaType(media);
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
hr = graphBuilder.AddFilter(baseGrabFlt, " Grabber");
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
Guid cat = PinCategory.Preview;
Guid med = MediaType.Video;
hr = capGraph.RenderStream(ref cat, ref med, capFilter, null, null); // baseGrabFlt
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
cat = PinCategory.Capture;
med = MediaType.Video;
hr = capGraph.RenderStream(ref cat, ref med, capFilter, null, baseGrabFlt); // baseGrabFlt
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
media = new AMMediaType();
hr = sampGrabber.GetConnectedMediaType(media);
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
if ((media.formatType != FormatType.VideoInfo) || (media.formatPtr == IntPtr.Zero))
{
throw new NotSupportedException("Unknown Grabber Media Format");
}
videoInfoHeader = (VideoInfoHeader)Marshal.PtrToStructure(media.formatPtr, typeof(VideoInfoHeader));
Marshal.FreeCoTaskMem(media.formatPtr); media.formatPtr = IntPtr.Zero;
hr = sampGrabber.SetBufferSamples(false);
if (hr == 0)
{
hr = sampGrabber.SetOneShot(false);
}
if (hr == 0)
{
hr = sampGrabber.SetCallback(null, 0);
}
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
return(true);
}
catch (Exception ee)
{
MessageBox.Show(this, "Could not setup graph\r\n" + ee.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false);
}
}
/// <summary> build the capture graph. </summary>
bool SetupGraph()
{
int hr;
IBaseFilter mux = null;
IFileSinkFilter sink = null;
try
{
hr = capGraph.SetFiltergraph(graphBuilder);
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
hr = graphBuilder.AddFilter(capFilter, "Ds.NET Video Capture Device");
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
DsUtils.ShowCapPinDialog(capGraph, capFilter, this.Handle);
Guid sub = MediaSubType.Avi;
hr = capGraph.SetOutputFileName(ref sub, fileName, out mux, out sink);
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
Guid cat = PinCategory.Capture;
Guid med = MediaType.Video;
hr = capGraph.RenderStream(ref cat, ref med, capFilter, null, mux); // stream to file
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
cat = PinCategory.Preview;
med = MediaType.Video;
hr = capGraph.RenderStream(ref cat, ref med, capFilter, null, null); // preview window
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
return(true);
}
catch (Exception ee)
{
MessageBox.Show(this, "Could not setup graph\r\n" + ee.Message, "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false);
}
finally
{
if (mux != null)
{
Marshal.ReleaseComObject(mux);
}
mux = null;
if (sink != null)
{
Marshal.ReleaseComObject(sink);
}
sink = null;
}
}
