public IVideoCapture CreateVideoCapture(string deviceName, IVideoResolutionSeletor selector)
{
return(new DirectShowVideoCapture(DeviceManager.GetVideoInputDevices().Single(d => d.Name.Equals(deviceName)), selector));
}
public DirectShowVideoCapture(DsDevice device, IVideoResolutionSeletor resolutionSelector)
{
if (device == null)
{
throw new ArgumentNullException("device", "Device must not be null");
}
_dispatcher = Dispatcher.CurrentDispatcher;
_deviceName = device.Name;
ICaptureGraphBuilder2 graphBuilder = (ICaptureGraphBuilder2)(new CaptureGraphBuilder2());
IGraphBuilder graph = (IGraphBuilder)(new FilterGraphNoThread());
Marshal.ThrowExceptionForHR(graphBuilder.SetFiltergraph(graph));
IBaseFilter filter;
IFilterGraph2 filterGraph = (IFilterGraph2)graph;
DsError.ThrowExceptionForHR(filterGraph.AddSourceFilterForMoniker(device.Mon, null, device.Name, out filter));
object streamConfig;
ICaptureGraphBuilder2 captureGraphBuilder = (ICaptureGraphBuilder2)graphBuilder;
DsError.ThrowExceptionForHR(captureGraphBuilder.FindInterface(PinCategory.Capture, MediaType.Video, filter, typeof(IAMStreamConfig).GUID, out streamConfig));
var videoStreamConfig = streamConfig as IAMStreamConfig;
int capCount, capSize;
videoStreamConfig.GetNumberOfCapabilities(out capCount, out capSize);
IntPtr taskMemPointer = Marshal.AllocCoTaskMem(capSize);
AMMediaType pmtConfig = null;
_allResolutions = new List <IVideoResolution>(capSize);
for (int iFormat = 0; iFormat < capCount; iFormat++)
{
IntPtr ptr = IntPtr.Zero;
videoStreamConfig.GetStreamCaps(iFormat, out pmtConfig, taskMemPointer);
var v = (VideoInfoHeader)Marshal.PtrToStructure(pmtConfig.formatPtr, typeof(VideoInfoHeader));
var bmiHeader = v.BmiHeader;
_allResolutions.Add(new VideoResolution(bmiHeader.Width, bmiHeader.Height, (int)bmiHeader.BitCount));
}
_allResolutions.Sort(new VideoResolutionComparer());
_matchingResolutions = _allResolutions.Where(r => resolutionSelector == null || resolutionSelector.IsMatch(r.Width, r.Height, r.BitCount)).ToArray();
_resolution = _matchingResolutions.Last();
Marshal.FreeCoTaskMem(taskMemPointer);
DsUtils.FreeAMMediaType(pmtConfig);
AMMediaType media;
DsError.ThrowExceptionForHR(videoStreamConfig.GetFormat(out media));
var videoInfo = new VideoInfoHeader();
Marshal.PtrToStructure(media.formatPtr, videoInfo);
videoInfo.BmiHeader.Width = _resolution.Width;
videoInfo.BmiHeader.Height = _resolution.Height;
videoInfo.BmiHeader.BitCount = (short)_resolution.BitCount;
Marshal.StructureToPtr(videoInfo, media.formatPtr, false);
DsError.ThrowExceptionForHR(videoStreamConfig.SetFormat(media));
DsUtils.FreeAMMediaType(media);
//sample grabber
var mediaType = new AMMediaType
{
majorType = MediaType.Video,
subType = MediaSubType.RGB24,
};
_sampleGrabber = (ISampleGrabber)(new SampleGrabber());
Marshal.ThrowExceptionForHR(_sampleGrabber.SetMediaType(mediaType));
DsUtils.FreeAMMediaType(mediaType);
Marshal.ThrowExceptionForHR(_sampleGrabber.SetOneShot(false));
Marshal.ThrowExceptionForHR(_sampleGrabber.SetBufferSamples(true));
Marshal.ThrowExceptionForHR(_sampleGrabber.SetCallback(this, 1));
IBaseFilter grabberFilter = (IBaseFilter)_sampleGrabber;
Marshal.ThrowExceptionForHR(graph.AddFilter(grabberFilter, "SampleGrabber"));
IBaseFilter nullRenderer = (IBaseFilter)(new NullRenderer());
Marshal.ThrowExceptionForHR(graph.AddFilter(nullRenderer, "Null Filter"));
Marshal.ThrowExceptionForHR(graphBuilder.RenderStream(null, MediaType.Video, filter, null, grabberFilter));
_mediaEvent = graph as IMediaEventEx;
_mediaControl = graph as IMediaControl;
Marshal.ReleaseComObject(graphBuilder);
_timer = new Timer(50);
_timer.Elapsed += TimerElapsed;
}
