SampleGrabber参数不正确
我正试图在我的directshow应用程序中使用samplegrabber保存jpg文件。 图表运行正常但是当我启动CaptureImage（）函数时，它获取到GetCurrentBuffer并返回“参数不正确”.. hr = -2147024809。
AMMediaType mediaType = new AMMediaType(); VideoInfoHeader videoInfo = new VideoInfoHeader(); (pSampleGrabber as ISampleGrabber).GetConnectedMediaType(mediaType); videoInfo = (VideoInfoHeader)Marshal.PtrToStructure(mediaType.formatPtr, typeof(VideoInfoHeader)); int width = videoInfo.BmiHeader.Width; int height = videoInfo.BmiHeader.Height; int size = videoInfo.BmiHeader.ImageSize; DsUtils.FreeAMMediaType(mediaType); int hr = 0; int bufferSize = 0; hr = (pSampleGrabber as ISampleGrabber).GetCurrentBuffer(ref bufferSize, IntPtr.Zero); CheckHR(hr, "Could not get buffer size for image capture."); IntPtr frameBufferPointer = Marshal.AllocCoTaskMem(bufferSize); hr = (pSampleGrabber as ISampleGrabber).GetCurrentBuffer(ref bufferSize, frameBufferPointer); CheckHR(hr, "Could not get buffer size for image capture."); byte[] frameBuffer = new byte[bufferSize]; Marshal.Copy(frameBufferPointer, frameBuffer, 0, bufferSize); Marshal.FreeCoTaskMem(frameBufferPointer); Bitmap frame = new Bitmap(width, height, PixelFormat.Format32bppArgb); Rectangle rect = new Rectangle(0, 0, width, height); BitmapData bmpData = frame.LockBits(rect, ImageLockMode.ReadWrite, frame.PixelFormat); Marshal.Copy(frameBuffer, 0, bmpData.Scan0, bufferSize); frame.UnlockBits(bmpData); frame.RotateFlip(RotateFlipType.RotateNoneFlipY); if (format == "PAL" || format == "NTSC" || format == "NTSC32") { Bitmap sdBitmap = new Bitmap(width, height); Graphics g = Graphics.FromImage((System.Drawing.Image)sdBitmap); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.DrawImage(frame, 0, 0, width, height); g.Dispose(); frame = sdBitmap; sdBitmap.Dispose(); } EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, (long)100); ImageCodecInfo jpegInfo = null; foreach (ImageCodecInfo codec in ImageCodecInfo.GetImageEncoders()) { if (codec.MimeType.ToLower() == "image/jpeg") { jpegInfo = codec; break; } } EncoderParameters encoderParam = new EncoderParameters(1); encoderParam.Param[0] = qualityParam; double timeStamp = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds; frame.Save(@"C:\Records\" + timeStamp.ToString() + ".jpg", jpegInfo, encoderParam); frame.Dispose(); 文件确实保存到最后，如果我拿出CheckHR检查但是图像是黑色的，具有正确的宽度和高度，这就是为什么我去检查HR以查看它是否健康。 显然不是。 我搜索谷歌试图弄清楚错误和问题中的任何常见问题，但再次，敲打我的脑袋。 🙁
下面快速浏览一下我的图表：
int hr = 0; // Graph builder. ICaptureGraphBuilder2 pBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2(); hr = pBuilder.SetFiltergraph(pGraph); CheckHR(hr, "Can't SetFiltergraph."); // Add Decklink Video Capture. IBaseFilter pDecklinkVideoCapture = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_DecklinkVideoCapture)); hr = pGraph.AddFilter(pDecklinkVideoCapture, "Decklink Video Capture"); CheckHR(hr, "Can't add Decklink Video Capture to graph."); // Get Decklink display format. Dictionary formats = GetDisplayFormat(pDecklinkVideoCapture); hr = (DsFindPin.ByName(pDecklinkVideoCapture, "Capture") as IAMStreamConfig).SetFormat(formats[format]); CheckHR(hr, "Can't set video format on Decklink Video Capture."); // Add Intel® Media SDK H.264 Encoder. IBaseFilter pIntelMediaSDKH264Encoder = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_IntelMediaSDKH264Encoder)); hr = pGraph.AddFilter(pIntelMediaSDKH264Encoder, "Intel® Media SDK H.264 Encoder"); CheckHR(hr, "Can't add Intel® Media SDK H.264 Encoder to graph."); // Add Intel® Media SDK MP4 Muxer. IBaseFilter pIntelMediaSDKMP4Muxer = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_IntelMediaSDKMP4Muxer)); hr = pGraph.AddFilter(pIntelMediaSDKMP4Muxer, "Intel® Media SDK MP4 Muxer"); CheckHR(hr, "Can't add Intel® Media SDK MP4 Muxer to graph."); // Add File writer. IBaseFilter pFilewriter = (IBaseFilter)new FileWriter(); hr = pGraph.AddFilter(pFilewriter, "File writer"); CheckHR(hr, "Can't add File writer to graph"); // Set destination filename. IFileSinkFilter pFilewriter_sink = pFilewriter as IFileSinkFilter; if (pFilewriter_sink == null) { CheckHR(unchecked((int)0x80004002), "Can't get IFileSinkFilter"); } hr = pFilewriter_sink.SetFileName(destination, null); CheckHR(hr, "Can't set filename."); // Add Smart Tee. IBaseFilter pSmartTee = (IBaseFilter)new SmartTee(); hr = pGraph.AddFilter(pSmartTee, "Smart Tee"); CheckHR(hr, "Can't add Smart Tee to graph."); // Add AVI Decompressor. IBaseFilter pAVIDecompressor2 = (IBaseFilter)new AVIDec(); hr = pGraph.AddFilter(pAVIDecompressor2, "AVI Decompressor"); CheckHR(hr, "Can't add AVI Decompressor to graph."); // Add SampleGrabber. pSampleGrabber = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_SampleGrabber)); hr = pGraph.AddFilter(pSampleGrabber, "SampleGrabber"); CheckHR(hr, "Can't add SampleGrabber to graph."); // Set SampleGrabber Media Type. AMMediaType pSampleGrabber_pmt = new AMMediaType(); pSampleGrabber_pmt.majorType = MediaType.Video; pSampleGrabber_pmt.subType = new Guid("{43594448-0000-0010-8000-00AA00389B71}"); 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."); // Add Null Renderer. IBaseFilter pNullRenderer = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_NullRenderer)); hr = pGraph.AddFilter(pNullRenderer, "Null Renderer"); CheckHR(hr, "Can't add Null Renderer to graph."); // Connect Decklink Video Capture and Smart Tee. hr = pGraph.ConnectDirect(GetPin(pDecklinkVideoCapture, "Capture"), GetPin(pSmartTee, "Input"), null); CheckHR(hr, "Can't connect Decklink Video Capture and Smart Tee."); // Connect Smart Tee and AVI Decompressor. hr = pGraph.ConnectDirect(GetPin(pSmartTee, "Capture"), GetPin(pAVIDecompressor2, "XForm In"), null); CheckHR(hr, "Can't connect Smart Tee and AVI Decompressor."); // Connect AVI Decompressor and Intel® Media SDK H.264 Encoder. hr = pGraph.ConnectDirect(GetPin(pAVIDecompressor2, "XForm Out"), GetPin(pIntelMediaSDKH264Encoder, "In"), null); CheckHR(hr, "Can't connect AVI Decompressor and Intel® Media SDK H.264 Encoder."); // Connect Intel® Media SDK H.264 Encoder and Intel® Media SDK MP4 Muxer. hr = pGraph.ConnectDirect(GetPin(pIntelMediaSDKH264Encoder, "Out"), GetPin(pIntelMediaSDKMP4Muxer, "Input 0"), null); CheckHR(hr, "Can't connect Intel® Media SDK H.264 Encoder and Intel® Media SDK MP4 Muxer."); // Connect Intel® Media SDK MP4 Muxer and File writer. hr = pGraph.ConnectDirect(GetPin(pIntelMediaSDKMP4Muxer, "Output"), GetPin(pFilewriter, "in"), null); CheckHR(hr, "Can't connect Intel® Media SDK MP4 Muxer and File writer."); // 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 Null Renderer. hr = pGraph.ConnectDirect(GetPin(pSampleGrabber, "Output"), GetPin(pNullRenderer, "In"), null); CheckHR(hr, "Can't connect SampleGrabber and Null Renderer.");
任何建议或想法都是最受欢迎的。 如果需要更多信息，请与我们联系。
干杯。
转换为hex的-2147024809是0x80070057，即E_INVALIDARG。
GetCurrentBuffer的E_INVALIDARG表示：样本未被缓冲。 调用ISampleGrabber :: SetBufferSamples。
要激活缓冲，请调用值为TRUE的ISampleGrabber :: SetBufferSamples。