使用色彩转换器DMO失真跳过播放

Question

我正在使用另一个directshow图形，似乎无法理解我所看到的问题。当我在Graphedit中将图形捕捉到一起时，它会这样：

filesource ->多路分解器->解码器->颜色转换器dmo ->外部渲染

这是完美的工作和回放是惊人的！

但在代码中(并且图形构建得很完美，没有错误)...它做不到我想要的.相反，它播放文件，然而，回放是非常像素的黑色，它看起来像是跳到前一帧的顶部，而不是删除前一帧。

下面是我的代码：

private static void BuildGraph(IGraphBuilder pGraph, string source)
{
    int hr = 0;

    // Graph builder.
    pBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
    hr = pBuilder.SetFiltergraph(pGraph);
    CheckHR(hr, "Can't SetFiltergraph.");

    // Add File Source (Async.).
    pFileSourceAsync = (IBaseFilter)new AsyncReader();
    hr = pGraph.AddFilter(pFileSourceAsync, "File Source (Async.)");
    CheckHR(hr, "Can't add File Source (Async.) to graph.");

    // Set source filename.
    pFileSourceAsync_src = pFileSourceAsync as IFileSourceFilter;

    if (pFileSourceAsync_src == null)
    {
        CheckHR(unchecked((int)0x80004002), "Can't get IFileSourceFilter.");
    }

    hr = pFileSourceAsync_src.Load(source, null);
    CheckHR(hr, "Can't load file.");

    // Add MPEG4 Demultiplexor.
    pMPEG4Demultiplexor = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_MPEG4Demultiplexor));
    hr = pGraph.AddFilter(pMPEG4Demultiplexor, "MPEG4 Demultiplexor");
    CheckHR(hr, "Can't add MPEG4 Demultiplexor to graph.");

    // Add Microsoft DTV-DVD Video Decoder.
    pMicrosoftDTVDVDVideoDecoder = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_MicrosoftDTVDVDVideoDecoder));
    hr = pGraph.AddFilter(pMicrosoftDTVDVDVideoDecoder, "Microsoft DTV-DVD Video Decoder");
    CheckHR(hr, "Can't add Microsoft DTV-DVD Video Decoder to graph.");

    // Add Color Converter DMO.
    dmoFilter = (IBaseFilter)new DMOWrapperFilter();
    dmoWrapper = (IDMOWrapperFilter)dmoFilter;
    hr = dmoWrapper.Init(CLSID_ColorConverterDMO, DMOCategory.VideoEffect);
    CheckHR(hr, "Can't initialize Color Converter DMO.");
    hr = pGraph.AddFilter(dmoFilter, "DMO Filter");
    CheckHR(hr, "Can't add Color Converter DMO to graph.");


    //IMediaParams dmoParams = dmoFilter as IMediaParams;
    //MPData srcLeft = new MPData();
    //MPData srcTop = new MPData();
    //MPData destLeft = new MPData();
    //MPData destTop = new MPData();
    //MPData width = new MPData();
    //MPData height = new MPData();
    //srcLeft.vFloat = 0;
    //srcTop.vFloat = 0;
    //destLeft.vFloat = 0;
    //destTop.vFloat = 0;
    //width.vFloat = 1280;
    //height.vFloat = 720;
    //dmoParams.SetParam(0, srcLeft);
    //dmoParams.SetParam(1, srcTop);
    //dmoParams.SetParam(2, destLeft);
    //dmoParams.SetParam(3, destTop);
    //dmoParams.SetParam(4, width);
    //dmoParams.SetParam(5, height);


    // Add Smart Tee.
    pSmartTee = (IBaseFilter)new SmartTee();
    hr = pGraph.AddFilter(pSmartTee, "Smart Tee");
    CheckHR(hr, "Can't add Smart Tee to graph.");

    // Add Decklink Video Render.
    pDecklinkVideoRender = CreateFilterByName(@"Decklink Video Render", CLSID_ExternalRenderers);
    hr = pGraph.AddFilter(pDecklinkVideoRender, "Decklink Video Render");
    CheckHR(hr, "Can't add Decklink Video Render to graph.");

    // Add AVI Decompressor.
    pAVIDecompressor = (IBaseFilter)new AVIDec();
    hr = pGraph.AddFilter(pAVIDecompressor, "AVI Decompressor");
    CheckHR(hr, "Can't add AVI Decompressor to graph.");

    // Add Color Space Converter.
    pColorSpaceConverter = (IBaseFilter)new Colour();
    hr = pGraph.AddFilter(pColorSpaceConverter, "Color Space Converter");
    CheckHR(hr, "Can't add Color Space Converter to graph.");

    // Add Null Renderer.
    pNullRenderer = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_NullRenderer));
    hr = pGraph.AddFilter(pNullRenderer, "Null Renderer");
    CheckHR(hr, "Can't add Null Renderer to graph.");

    // Connect File Source (Async.) and MPEG4 Demultiplexor.
    hr = pGraph.ConnectDirect(GetPin(pFileSourceAsync, "Output"), GetPin(pMPEG4Demultiplexor, "Input"), null);
    CheckHR(hr, "Can't connect File Source (Async.) and MPEG4 Demultiplexor.");

    // Connect MPEG4 Demultiplexor and Microsoft DTV-DVD Video Decoder.
    hr = pGraph.ConnectDirect(GetPin(pMPEG4Demultiplexor, "Video 1"), GetPin(pMicrosoftDTVDVDVideoDecoder, "Video Input"), null);
    CheckHR(hr, "Can't connect MPEG4 Demultiplexor and Microsoft DTV-DVD Video Decoder.");

    // Connect Microsoft DTV-DVD Video Decoder and Color Converter DMO.
    hr = pGraph.ConnectDirect(GetPin(pMicrosoftDTVDVDVideoDecoder, "Video Output 1"), GetPin(dmoFilter, "in0"), null);
    CheckHR(hr, "Can't connect Microsoft DTV-DVD Video Decoder and Color Converter DMO.");

    // Connect Color Converter DMO and Smart Tee Filter.
    hr = pGraph.ConnectDirect(GetPin(dmoFilter, "out0"), GetPin(pSmartTee, "Input"), null);
    CheckHR(hr, "Can't connect Color Converter DMO and Smart Tee Filter.");

    // Connect Smart Tee Filter and Decklink Video Render.
    hr = pGraph.ConnectDirect(GetPin(pSmartTee, "Capture"), GetPin(pDecklinkVideoRender, "In"), null);
    CheckHR(hr, "Can't connect Smart Tee Filter and Decklink Video Render.");

    // Add SampleGrabber.
    pSampleGrabber = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_SampleGrabber));
    hr = pGraph.AddFilter(pSampleGrabber, "SampleGrabber");
    CheckHR(hr, "Can't add SampleGrabber to graph.");
    (pSampleGrabber as ISampleGrabber).SetBufferSamples(true);
    (pSampleGrabber as ISampleGrabber).SetOneShot(false);

    // Connect Smart Tee and SampleGrabber.
    hr = pGraph.ConnectDirect(GetPin(pSmartTee, "Preview"), GetPin(pSampleGrabber, "Input"), null);
    CheckHR(hr, "Can't connect Smart Tee and SampleGrabber.");

    // Connect SampleGrabber and AVIDecompressor.
    hr = pGraph.ConnectDirect(GetPin(pSampleGrabber, "Output"), GetPin(pAVIDecompressor, "XForm In"), null);
    CheckHR(hr, "Can't connect SampleGrabber and AVIDecompressor.");

    // Connect AVIDecompressor and Color Space Converter.
    hr = pGraph.ConnectDirect(GetPin(pAVIDecompressor, "XForm Out"), GetPin(pColorSpaceConverter, "Input"), null);
    CheckHR(hr, "Can't connect Color Space Converter and SampleGrabber.");

    // Connect Color Space Converter and Null Renderer.
    hr = pGraph.ConnectDirect(GetPin(pColorSpaceConverter, "XForm Out"), GetPin(pNullRenderer, "In"), null);
    CheckHR(hr, "Can't connect Color Space Converter and Null Renderer.");

    // Set SampleGrabber Media Type.
    AMMediaType pSampleGrabber_pmt = new AMMediaType();
    pSampleGrabber_pmt.majorType = MediaType.Video;
    pSampleGrabber_pmt.subType = MediaSubType.RGB32;
    pSampleGrabber_pmt.formatType = FormatType.VideoInfo;
    VideoInfoHeader pSampleGrabber_format = new VideoInfoHeader();
    pSampleGrabber_pmt.formatPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(pSampleGrabber_format));
    Marshal.StructureToPtr(pSampleGrabber_format, pSampleGrabber_pmt.formatPtr, false);
    hr = ((ISampleGrabber)pSampleGrabber).SetMediaType(pSampleGrabber_pmt);
    DsUtils.FreeAMMediaType(pSampleGrabber_pmt);
    CheckHR(hr, "Can't set media type to sample grabber.");
}

你会看到我有更多的代码，比如连接一个智能T恤和一个样本采集器(这不是原因，因为我之前为了检查结果而注释掉了它，没有变化，最终我想从视频流中捕获静止图像……所以当我准备好的时候，我已经准备好了)。

我认为问题出在颜色转换器dmo上，但我不能完全确定...在graphedit中精确的图形运行没有任何问题，但是代码模式给了我可怕的回放。也许我忘记用颜色转换器dmo做什么了？还是包装纸？任何想法都将不胜感激。

谢谢，干杯。

Answer 1

我没有关于Color Converter DMO的详细信息，但从使用其他Vista+ DMO的经验来看-它们并不打算在DirectShow中使用。是的，它们仍然是DMO，实现了IMediaObject接口，DMO Wrapper Filter也在那里，但小问题正在破坏集成。

如果它不能开箱即用，那么很可能您将不得不将DMO放入您自己的包装器过滤器中。这肯定会成功的，而且--好消息是--并不是那么复杂。

较老的DMO肯定已经测试过在带有股票包装器过滤器的DirectShow中的使用，这就是为什么它们一直在工作，这就是为什么DMO Wrapper Filter是第一个可用的。