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POAdding an ISampleGrabber filter to my current graph
 

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  1. POAdding an ISampleGrabber filter to my current graph
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    <p>I am currently trying to add a ISampleGrabber filter to my program. Currently the program captures and displays a preview to my windows form however when i try to add my own ISampleGrabber filter using others examples the webcam section of the program stops working completely.</p> <pre><code> IVideoWindow videoWindow = null; IMediaControl mediaControl = null; IMediaEventEx mediaEventEx = null; IGraphBuilder graphBuilder = null; ICaptureGraphBuilder2 captureGraphBuilder = null; IBaseFilter baseFilterForSampleGrabber; ISampleGrabber sampleGrabber; AMMediaType mediaType; VideoInfoHeader videoInfoHeader; public void capturePreview() { int hr = 0; IBaseFilter baseFilter = null; try { interfaces(); hr = this.captureGraphBuilder.SetFiltergraph(this.graphBuilder); DsError.ThrowExceptionForHR(hr); baseFilter = getListOfDevices(); hr = this.graphBuilder.AddFilter(baseFilter, "Webcam"); DsError.ThrowExceptionForHR(hr); sampleGrabber = new SampleGrabber() as ISampleGrabber; baseFilterForSampleGrabber = (IBaseFilter)new SampleGrabber(); if (baseFilterForSampleGrabber == null) { Marshal.ReleaseComObject(sampleGrabber); sampleGrabber = null; } mediaType = new AMMediaType(); mediaType.majorType = MediaType.Video; mediaType.subType = MediaSubType.RGB24; mediaType.formatType = FormatType.VideoInfo; //int width = videoInfoHeader.BmiHeader.Width; //int height = videoInfoHeader.BmiHeader.Height; //int size = videoInfoHeader.BmiHeader.ImageSize; //mediaType.formatPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(videoInfoHeader)); //Marshal.StructureToPtr(videoInfoHeader, mediaType.formatPtr, false); hr = sampleGrabber.SetMediaType(mediaType); DsUtils.FreeAMMediaType(mediaType); hr = graphBuilder.AddFilter(baseFilterForSampleGrabber, "ISampleGrabber Filter"); DsError.ThrowExceptionForHR(hr); hr = this.captureGraphBuilder.RenderStream(PinCategory.Preview, MediaType.Video, baseFilter, baseFilterForSampleGrabber, null); DsError.ThrowExceptionForHR(hr); Marshal.ReleaseComObject(baseFilter); videoWindowSetup(); hr = sampleGrabber.SetBufferSamples(true); DsError.ThrowExceptionForHR(hr); hr = this.mediaControl.Run(); DsError.ThrowExceptionForHR(hr); } catch { MessageBox.Show("Error...Try restart"); } } </code></pre> <p>The above code contains my current graph along with the starting ISampleGrabber code I see repeated in every example, however when I add the commented code this is when the program stops. I do not know where the issue is and presume I should at least get the basics sorted before continuing adding on the graph.</p> <p>If I resolve this problem any further help on what else I require to complete this graph would be very helpful, I aim to convert the frames captured into bitmaps so I can immediately edit them, such as add a crosshair, and show them in the windows form once edited straight away.</p> <p>Any help is appreciated :)</p>
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