最近想把之前一个USB摄像头拍照的winform程序迁移到.net 5下，首先找了一下，网上有通过DirectShow.NET读取摄像头的例子，Read Barcode from Webcam Viewer with DirectShow.NET。
这个程序依赖着DirectShow.NET的，虽然它是.net framework版本的。试了一下，迁移到.net 5还是无任何障碍的。但我觉得这些原始api使用起来还是不是很方便，便继续找了一下，找到了一个更加简单的类
class UsbCamera:IDisposable { /// Usb camera image size. public Size Size { get; private set; } /// Start. public Action Start { get; private set; } /// Stop. public Action Stop { get; private set; } /// Release resource. public Action Release { get; private set; } /// Get image. /// Immediately after starting, fails because image buffer is not prepared yet. public Func GetBitmap { get; private set; } /// /// Get available USB camera list. /// /// Array of camera name, or if no device found, zero length array. public static string[] FindDevices() { return DirectShow.GetFiltes(DirectShow.DsGuid.CLSID_VideoInputDeviceCategory).ToArray(); } /// /// Get video formats. /// public static VideoFormat[] GetVideoFormat(int cameraIndex) { var filter = DirectShow.CreateFilter(DirectShow.DsGuid.CLSID_VideoInputDeviceCategory, cameraIndex); var pin = DirectShow.FindPin(filter, 0, DirectShow.PIN_DIRECTION.PINDIR_OUTPUT); return GetVideoOutputFormat(pin); } /// /// Create USB Camera. If device do not support the size, default size will applied. /// /// Camera index in FindDevices() result. /// /// Size you want to create. Normally use Size property of VideoFormat in GetVideoFormat() result. /// public UsbCamera(int cameraIndex, Size size) : this(cameraIndex, new VideoFormat() { Size = size }) { } /// /// Create USB Camera. If device do not support the format, default format will applied. /// /// Camera index in FindDevices() result. /// /// Normally use GetVideoFormat() result. /// You can change TimePerFrame value from Caps.MinFrameInterval to Caps.MaxFrameInterval. /// TimePerFrame = 10,000,000 / frame duration. (ex: 333333 in case 30fps). /// You can change Size value in case Caps.MaxOutputSize > Caps.MinOutputSize and OutputGranularityX/Y is not zero. /// Size = any value from Caps.MinOutputSize to Caps.MaxOutputSize step with OutputGranularityX/Y. /// public UsbCamera(int cameraIndex, VideoFormat format) { var camera_list = FindDevices(); if (cameraIndex >= camera_list.Length) throw new ArgumentException("USB camera is not available.", "cameraIndex"); Init(cameraIndex, format); } private void Init(int index, VideoFormat format) { //---------------------------------- // Create Filter Graph //---------------------------------- // +--------------------+ +----------------+ +---------------+ // |Video Capture Source|→| Sample Grabber |→| Null Renderer | // +--------------------+ +----------------+ +---------------+ // ↓GetBitmap() var graph = DirectShow.CreateGraph(); //---------------------------------- // VideoCaptureSource //---------------------------------- var vcap_source = CreateVideoCaptureSource(index, format); graph.AddFilter(vcap_source, "VideoCapture"); //------------------------------ // SampleGrabber //------------------------------ var grabber = CreateSampleGrabber(); graph.AddFilter(grabber, "SampleGrabber"); var i_grabber = (DirectShow.ISampleGrabber)grabber; i_grabber.SetBufferSamples(true); //--------------------------------------------------- // Null Renderer //--------------------------------------------------- var renderer = DirectShow.CoCreateInstance(DirectShow.DsGuid.CLSID_NullRenderer) as DirectShow.IBaseFilter; graph.AddFilter(renderer, "NullRenderer"); //--------------------------------------------------- // Create Filter Graph //--------------------------------------------------- var builder = DirectShow.CoCreateInstance(DirectShow.DsGuid.CLSID_CaptureGraphBuilder2) as DirectShow.ICaptureGraphBuilder2; builder.SetFiltergraph(graph); var pinCategory = DirectShow.DsGuid.PIN_CATEGORY_CAPTURE; var mediaType = DirectShow.DsGuid.MEDIATYPE_Video; builder.RenderStream(ref pinCategory, ref mediaType, vcap_source, grabber, renderer); // SampleGrabber Format. { var mt = new DirectShow.AM_MEDIA_TYPE(); i_grabber.GetConnectedMediaType(mt); var header = (DirectShow.VIDEOINFOHEADER)Marshal.PtrToStructure(mt.pbFormat, typeof(DirectShow.VIDEOINFOHEADER)); var width = header.bmiHeader.biWidth; var height = header.bmiHeader.biHeight; var stride = width * (header.bmiHeader.biBitCount / 8); DirectShow.DeleteMediaType(ref mt); Size = new Size(width, height); // fix screen tearing problem(issure #2) // you can use previous method if you swap the comment line below. // GetBitmap = () => GetBitmapFromSampleGrabberBuffer(i_grabber, width, height, stride); GetBitmap = GetBitmapFromSampleGrabberCallback(i_grabber, width, height, stride); } // Assign Delegates. Start = () => DirectShow.PlayGraph(graph, DirectShow.FILTER_STATE.Running); Stop = () => DirectShow.PlayGraph(graph, DirectShow.FILTER_STATE.Stopped); Release = () => { Stop(); DirectShow.ReleaseInstance(ref i_grabber); DirectShow.ReleaseInstance(ref builder); DirectShow.ReleaseInstance(ref graph); }; // Properties. Properties = new PropertyItems(vcap_source); } public void Dispose() { Release?.Invoke(); } /// Properties user can adjust. public PropertyItems Properties { get; private set; } public class PropertyItems { public PropertyItems(DirectShow.IBaseFilter vcap_source) { // Pan, Tilt, Roll, Zoom, Exposure, Iris, Focus this.CameraControl = Enum.GetValues(typeof(DirectShow.CameraControlProperty)).Cast() .Select(item => { PropertyItems.Property prop = null; try { var cam_ctrl = vcap_source as DirectShow.IAMCameraControl; if (cam_ctrl == null) throw new NotSupportedException("no IAMCameraControl Interface."); // will catched. int min = 0, max = 0, step = 0, def = 0, flags = 0; cam_ctrl.GetRange(item, ref min, ref max, ref step, ref def, ref flags); // COMException if not supports. prop = new Property(min, max, step, def, flags, (flag, value) => cam_ctrl.Set(item, value, (int)flag)); } catch (Exception) { prop = new Property(); } // available = false return new { Key = item, Value = prop }; }).ToDictionary(x => x.Key, x => x.Value); // Brightness, Contrast, Hue, Saturation, Sharpness, Gamma, ColorEnable, WhiteBalance, BacklightCompensation, Gain this.VideoProcAmp = Enum.GetValues(typeof(DirectShow.VideoProcAmpProperty)).Cast() .Select(item => { PropertyItems.Property prop = null; try { var vid_ctrl = vcap_source as DirectShow.IAMVideoProcAmp; if (vid_ctrl == null) throw new NotSupportedException("no IAMVideoProcAmp Interface."); // will catched. int min = 0, max = 0, step = 0, def = 0, flags = 0; vid_ctrl.GetRange(item, ref min, ref max, ref step, ref def, ref flags); // COMException if not supports. prop = new Property(min, max, step, def, flags, (flag, value) => vid_ctrl.Set(item, value, (int)flag)); } catch (Exception) { prop = new Property(); } // available = false return new { Key = item, Value = prop }; }).ToDictionary(x => x.Key, x => x.Value); } /// Camera Control properties. private Dictionary CameraControl; /// Video Processing Amplifier properties. private Dictionary VideoProcAmp; /// Get CameraControl Property. Check Available before use. public Property this[DirectShow.CameraControlProperty item] { get { return CameraControl[item]; } } /// Get VideoProcAmp Property. Check Available before use. public Property this[DirectShow.VideoProcAmpProperty item] { get { return VideoProcAmp[item]; } } public class Property { public int Min { get; private set; } public int Max { get; private set; } public int Step { get; private set; } public int Default { get; private set; } public DirectShow.CameraControlFlags Flags { get; private set; } public Action SetValue { get; private set; } public bool Available { get; private set; } public bool CanAuto { get; private set; } public Property() { this.SetValue = (flag, value) => { }; this.Available = false; } public Property(int min, int max, int step, int @default, int flags, Action set) { this.Min = min; this.Max = max; this.Step = step; this.Default = @default; this.Flags = (DirectShow.CameraControlFlags)flags; this.CanAuto = (Flags & DirectShow.CameraControlFlags.Auto) == DirectShow.CameraControlFlags.Auto; this.SetValue = set; this.Available = true; } public override string ToString() { return string.Format("Available={0}, Min={1}, Max={2}, Step={3}, Default={4}, Flags={5}", Available, Min, Max, Step, Default, Flags); } } } private class SampleGrabberCallback : DirectShow.ISampleGrabberCB { private byte[] Buffer; private object BufferLock = new object(); public Bitmap GetBitmap(int width, int height, int stride) { var result = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb); if (Buffer == null) return result; var bmp_data = result.LockBits(new Rectangle(Point.Empty, result.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb); lock (BufferLock) { // copy from last row. for (int y = 0; y < height; y++) { var src_idx = Buffer.Length - (stride * (y + 1)); var dst = IntPtr.Add(bmp_data.Scan0, stride * y); Marshal.Copy(Buffer, src_idx, dst, stride); } } result.UnlockBits(bmp_data); return result; } // called when each sample completed. // The data processing thread blocks until the callback method returns. If the callback does not return quickly, it can interfere with playback. public int BufferCB(double SampleTime, IntPtr pBuffer, int BufferLen) { if (Buffer == null || Buffer.Length != BufferLen) { Buffer = new byte[BufferLen]; } lock (BufferLock) { Marshal.Copy(pBuffer, Buffer, 0, BufferLen); } return 0; } // never called. public int SampleCB(double SampleTime, DirectShow.IMediaSample pSample) { throw new NotImplementedException(); } } private Func GetBitmapFromSampleGrabberCallback(DirectShow.ISampleGrabber i_grabber, int width, int height, int stride) { var sampler = new SampleGrabberCallback(); i_grabber.SetCallback(sampler, 1); // WhichMethodToCallback = BufferCB return () => sampler.GetBitmap(width, height, stride); } /// Get Bitmap from Sample Grabber Current Buffer private Bitmap GetBitmapFromSampleGrabberBuffer(DirectShow.ISampleGrabber i_grabber, int width, int height, int stride) { try { return GetBitmapFromSampleGrabberBufferMain(i_grabber, width, height, stride); } catch (COMException ex) { const uint VFW_E_WRONG_STATE = 0x80040227; if ((uint)ex.ErrorCode == VFW_E_WRONG_STATE) { // image data is not ready yet. return empty bitmap. return new Bitmap(width, height); } throw; } } /// Get Bitmap from Sample Grabber Current Buffer private Bitmap GetBitmapFromSampleGrabberBufferMain(DirectShow.ISampleGrabber i_grabber, int width, int height, int stride) { int sz = 0; i_grabber.GetCurrentBuffer(ref sz, IntPtr.Zero); // IntPtr.Zeroで呼び出してバッファサイズ取得 if (sz == 0) return null; var ptr = Marshal.AllocCoTaskMem(sz); i_grabber.GetCurrentBuffer(ref sz, ptr); var data = new byte[sz]; Marshal.Copy(ptr, data, 0, sz); var result = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb); var bmp_data = result.LockBits(new Rectangle(Point.Empty, result.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb); for (int y = 0; y < height; y++) { var src_idx = sz - (stride * (y + 1)); var dst = IntPtr.Add(bmp_data.Scan0, stride * y); Marshal.Copy(data, src_idx, dst, stride); } result.UnlockBits(bmp_data); Marshal.FreeCoTaskMem(ptr); return result; } private DirectShow.IBaseFilter CreateSampleGrabber() { var filter = DirectShow.CreateFilter(DirectShow.DsGuid.CLSID_SampleGrabber); var ismp = filter as DirectShow.ISampleGrabber; var mt = new DirectShow.AM_MEDIA_TYPE(); mt.MajorType = DirectShow.DsGuid.MEDIATYPE_Video; mt.SubType = DirectShow.DsGuid.MEDIASUBTYPE_RGB24; ismp.SetMediaType(mt); return filter; } /// /// Video Capture Sourceフィルタを作成する /// private DirectShow.IBaseFilter CreateVideoCaptureSource(int index, VideoFormat format) { var filter = DirectShow.CreateFilter(DirectShow.DsGuid.CLSID_VideoInputDeviceCategory, index); var pin = DirectShow.FindPin(filter, 0, DirectShow.PIN_DIRECTION.PINDIR_OUTPUT); SetVideoOutputFormat(pin, format); return filter; } /// /// ビデオキャプチャデバイスの出力形式を選択する。 /// private static void SetVideoOutputFormat(DirectShow.IPin pin, VideoFormat format) { var formats = GetVideoOutputFormat(pin); for (int i = 0; i < formats.Length; i++) { var item = formats[i]; if (item.MajorType != DirectShow.DsGuid.GetNickname(DirectShow.DsGuid.MEDIATYPE_Video)) continue; if (string.IsNullOrEmpty(format.SubType) == false && format.SubType != item.SubType) continue; if (item.Caps.Guid != DirectShow.DsGuid.FORMAT_VideoInfo) continue; if (item.Size.Width == format.Size.Width && item.Size.Height == format.Size.Height) { SetVideoOutputFormat(pin, i, format.Size, format.TimePerFrame); return; } } // Not found fixed size, search for variable size. for (int i = 0; i < formats.Length; i++) { var item = formats[i]; if (item.MajorType != DirectShow.DsGuid.GetNickname(DirectShow.DsGuid.MEDIATYPE_Video)) continue; if (string.IsNullOrEmpty(format.SubType) == false && format.SubType != item.SubType) continue; if (item.Caps.Guid != DirectShow.DsGuid.FORMAT_VideoInfo) continue; if (item.Caps.OutputGranularityX == 0) continue; if (item.Caps.OutputGranularityY == 0) continue; for (int w = item.Caps.MinOutputSize.cx; w < item.Caps.MaxOutputSize.cx; w += item.Caps.OutputGranularityX) { for (int h = item.Caps.MinOutputSize.cy; h < item.Caps.MaxOutputSize.cy; h += item.Caps.OutputGranularityY) { if (w == format.Size.Width && h == format.Size.Height) { SetVideoOutputFormat(pin, i, format.Size, format.TimePerFrame); return; } } } } // Not found, use default size. SetVideoOutputFormat(pin, 0, Size.Empty, 0); } private static VideoFormat[] GetVideoOutputFormat(DirectShow.IPin pin) { var config = pin as DirectShow.IAMStreamConfig; if (config == null) { throw new InvalidOperationException("no IAMStreamConfig interface."); } int cap_count = 0, cap_size = 0; config.GetNumberOfCapabilities(ref cap_count, ref cap_size); if (cap_size != Marshal.SizeOf(typeof(DirectShow.VIDEO_STREAM_CONFIG_CAPS))) { throw new InvalidOperationException("no VIDEO_STREAM_CONFIG_CAPS."); } var result = new VideoFormat[cap_count]; var cap_data = Marshal.AllocHGlobal(cap_size); for (int i = 0; i < cap_count; i++) { var entry = new VideoFormat(); DirectShow.AM_MEDIA_TYPE mt = null; config.GetStreamCaps(i, ref mt, cap_data); entry.Caps = PtrToStructure(cap_data); entry.MajorType = DirectShow.DsGuid.GetNickname(mt.MajorType); entry.SubType = DirectShow.DsGuid.GetNickname(mt.SubType); if (mt.FormatType == DirectShow.DsGuid.FORMAT_VideoInfo) { var vinfo = PtrToStructure(mt.pbFormat); entry.Size = new Size(vinfo.bmiHeader.biWidth, vinfo.bmiHeader.biHeight); entry.TimePerFrame = vinfo.AvgTimePerFrame; } else if (mt.FormatType == DirectShow.DsGuid.FORMAT_VideoInfo2) { var vinfo = PtrToStructure(mt.pbFormat); entry.Size = new Size(vinfo.bmiHeader.biWidth, vinfo.bmiHeader.biHeight); entry.TimePerFrame = vinfo.AvgTimePerFrame; } // 解放 DirectShow.DeleteMediaType(ref mt); result[i] = entry; } // 解放 Marshal.FreeHGlobal(cap_data); return result; } private static void SetVideoOutputFormat(DirectShow.IPin pin, int index, Size size, long timePerFrame) { var config = pin as DirectShow.IAMStreamConfig; if (config == null) { throw new InvalidOperationException("no IAMStreamConfig interface."); } int cap_count = 0, cap_size = 0; config.GetNumberOfCapabilities(ref cap_count, ref cap_size); if (cap_size != Marshal.SizeOf(typeof(DirectShow.VIDEO_STREAM_CONFIG_CAPS))) { throw new InvalidOperationException("no VIDEO_STREAM_CONFIG_CAPS."); } var cap_data = Marshal.AllocHGlobal(cap_size); DirectShow.AM_MEDIA_TYPE mt = null; config.GetStreamCaps(index, ref mt, cap_data); var cap = PtrToStructure(cap_data); if (mt.FormatType == DirectShow.DsGuid.FORMAT_VideoInfo) { var vinfo = PtrToStructure(mt.pbFormat); if (!size.IsEmpty) { vinfo.bmiHeader.biWidth = size.Width; vinfo.bmiHeader.biHeight = size.Height; } if (timePerFrame > 0) { vinfo.AvgTimePerFrame = timePerFrame; } Marshal.StructureToPtr(vinfo, mt.pbFormat, true); } else if (mt.FormatType == DirectShow.DsGuid.FORMAT_VideoInfo2) { var vinfo = PtrToStructure(mt.pbFormat); if (!size.IsEmpty) { vinfo.bmiHeader.biWidth = size.Width; vinfo.bmiHeader.biHeight = size.Height; } if (timePerFrame > 0) { vinfo.AvgTimePerFrame = timePerFrame; } Marshal.StructureToPtr(vinfo, mt.pbFormat, true); } config.SetFormat(mt); if (cap_data != System.IntPtr.Zero) Marshal.FreeHGlobal(cap_data); if (mt != null) DirectShow.DeleteMediaType(ref mt); } private static T PtrToStructure(IntPtr ptr) { return (T)Marshal.PtrToStructure(ptr, typeof(T)); } public class VideoFormat { public string MajorType { get; set; } public string SubType { get; set; } public Size Size { get; set; } public long TimePerFrame { get; set; } public DirectShow.VIDEO_STREAM_CONFIG_CAPS Caps { get; set; } public override string ToString() { return string.Format("{0}, {1}, {2}, {3}, {4}", MajorType, SubType, Size, TimePerFrame, CapsString()); } private string CapsString() { var sb = new StringBuilder(); sb.AppendFormat("{0}, ", DirectShow.DsGuid.GetNickname(Caps.Guid)); foreach (var info in Caps.GetType().GetFields()) { sb.AppendFormat("{0}={1}, ", info.Name, info.GetValue(Caps)); } return sb.ToString(); } } public static class DirectShow { #region Function public static object CoCreateInstance(Guid clsid) { return Activator.CreateInstance(Type.GetTypeFromCLSID(clsid)); } public static void ReleaseInstance(ref T com) where T : class { if (com != null) { Marshal.ReleaseComObject(com); com = null; } } public static IGraphBuilder CreateGraph() { return CoCreateInstance(DsGuid.CLSID_FilterGraph) as IGraphBuilder; } public static void PlayGraph(IGraphBuilder graph, FILTER_STATE state) { var mediaControl = graph as IMediaControl; if (mediaControl == null) return; switch (state) { case FILTER_STATE.Paused: mediaControl.Pause(); break; case FILTER_STATE.Stopped: mediaControl.Stop(); break; default: mediaControl.Run(); break; } } public static List GetFiltes(Guid category) { var result = new List(); EnumMonikers(category, (moniker, prop) => { object value = null; prop.Read("FriendlyName", ref value, 0); var name = (string)value; result.Add(name); return false; // 継続。 }); return result; } public static IBaseFilter CreateFilter(Guid clsid) { return CoCreateInstance(clsid) as IBaseFilter; } public static IBaseFilter CreateFilter(Guid category, int index) { IBaseFilter result = null; int curr_index = 0; EnumMonikers(category, (moniker, prop) => { if (index != curr_index++) return false; { object value = null; Guid guid = DirectShow.DsGuid.IID_IBaseFilter; moniker.BindToObject(null, null, ref guid, out value); result = value as IBaseFilter; return true; } }); if (result == null) throw new ArgumentException("can't create filter."); return result; } private static void EnumMonikers(Guid category, Func func) { IEnumMoniker enumerator = null; ICreateDevEnum device = null; try { device = (ICreateDevEnum)Activator.CreateInstance(Type.GetTypeFromCLSID(DsGuid.CLSID_SystemDeviceEnum)); device.CreateClassEnumerator(ref category, ref enumerator, 0); if (enumerator == null) return; var monikers = new IMoniker[1]; var fetched = IntPtr.Zero; while (enumerator.Next(monikers.Length, monikers, fetched) == 0) { var moniker = monikers[0]; object value = null; Guid guid = DsGuid.IID_IPropertyBag; moniker.BindToStorage(null, null, ref guid, out value); var prop = (IPropertyBag)value; try { var rc = func(moniker, prop); if (rc == true) break; } finally { Marshal.ReleaseComObject(prop); if (moniker != null) Marshal.ReleaseComObject(moniker); } } } finally { if (enumerator != null) Marshal.ReleaseComObject(enumerator); if (device != null) Marshal.ReleaseComObject(device); } } public static IPin FindPin(IBaseFilter filter, string name) { var result = EnumPins(filter, (info) => { return (info.achName == name); }); if (result == null) throw new ArgumentException("can't fild pin."); return result; } public static IPin FindPin(IBaseFilter filter, int index, PIN_DIRECTION direction) { int curr_index = 0; var result = EnumPins(filter, (info) => { if (info.dir != direction) return false; return (index == curr_index++); }); if (result == null) throw new ArgumentException("can't fild pin."); return result; } private static IPin EnumPins(IBaseFilter filter, Func func) { IEnumPins pins = null; IPin ipin = null; try { filter.EnumPins(ref pins); int fetched = 0; while (pins.Next(1, ref ipin, ref fetched) == 0) { if (fetched == 0) break; var info = new PIN_INFO(); try { ipin.QueryPinInfo(info); var rc = func(info); if (rc) return ipin; } finally { if (info.pFilter != null) Marshal.ReleaseComObject(info.pFilter); } } } catch { if (ipin != null) Marshal.ReleaseComObject(ipin); throw; } finally { if (pins != null) Marshal.ReleaseComObject(pins); } return null; } public static void ConnectFilter(IGraphBuilder graph, IBaseFilter out_flt, int out_no, IBaseFilter in_flt, int in_no) { var out_pin = FindPin(out_flt, out_no, PIN_DIRECTION.PINDIR_OUTPUT); var inp_pin = FindPin(in_flt, in_no, PIN_DIRECTION.PINDIR_INPUT); graph.Connect(out_pin, inp_pin); } public static void DeleteMediaType(ref AM_MEDIA_TYPE mt) { if (mt.lSampleSize != 0) Marshal.FreeCoTaskMem(mt.pbFormat); if (mt.pUnk != IntPtr.Zero) Marshal.FreeCoTaskMem(mt.pUnk); mt = null; } #endregion #region Interface [ComVisible(true), ComImport(), Guid("56a8689f-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IFilterGraph { int AddFilter([In] IBaseFilter pFilter, [In, MarshalAs(UnmanagedType.LPWStr)] string pName); int RemoveFilter([In] IBaseFilter pFilter); int EnumFilters([In, Out] ref IEnumFilters ppEnum); int FindFilterByName([In, MarshalAs(UnmanagedType.LPWStr)] string pName, [In, Out] ref IBaseFilter ppFilter); int ConnectDirect([In] IPin ppinOut, [In] IPin ppinIn, [In, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int Reconnect([In] IPin ppin); int Disconnect([In] IPin ppin); int SetDefaultSyncSource(); } [ComVisible(true), ComImport(), Guid("56a868a9-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IGraphBuilder : IFilterGraph { int Connect([In] IPin ppinOut, [In] IPin ppinIn); int Render([In] IPin ppinOut); int RenderFile([In, MarshalAs(UnmanagedType.LPWStr)] string lpcwstrFile, [In, MarshalAs(UnmanagedType.LPWStr)] string lpcwstrPlayList); int AddSourceFilter([In, MarshalAs(UnmanagedType.LPWStr)] string lpcwstrFileName, [In, MarshalAs(UnmanagedType.LPWStr)] string lpcwstrFilterName, [In, Out] ref IBaseFilter ppFilter); int SetLogFile(IntPtr hFile); int Abort(); int ShouldOperationContinue(); } [ComVisible(true), ComImport(), Guid("56a868b1-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsDual)] public interface IMediaControl { int Run(); int Pause(); int Stop(); int GetState(int msTimeout, out int pfs); int RenderFile(string strFilename); int AddSourceFilter([In] string strFilename, [In, Out, MarshalAs(UnmanagedType.IDispatch)] ref object ppUnk); int get_FilterCollection([In, Out, MarshalAs(UnmanagedType.IDispatch)] ref object ppUnk); int get_RegFilterCollection([In, Out, MarshalAs(UnmanagedType.IDispatch)] ref object ppUnk); int StopWhenReady(); } [ComVisible(true), ComImport(), Guid("93E5A4E0-2D50-11d2-ABFA-00A0C9C6E38D"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface ICaptureGraphBuilder2 { int SetFiltergraph([In] IGraphBuilder pfg); int GetFiltergraph([In, Out] ref IGraphBuilder ppfg); int SetOutputFileName([In] ref Guid pType, [In, MarshalAs(UnmanagedType.LPWStr)] string lpstrFile, [In, Out] ref IBaseFilter ppbf, [In, Out] ref IFileSinkFilter ppSink); int FindInterface([In] ref Guid pCategory, [In] ref Guid pType, [In] IBaseFilter pbf, [In] IntPtr riid, [In, Out, MarshalAs(UnmanagedType.IUnknown)] ref object ppint); int RenderStream([In] ref Guid pCategory, [In] ref Guid pType, [In, MarshalAs(UnmanagedType.IUnknown)] object pSource, [In] IBaseFilter pfCompressor, [In] IBaseFilter pfRenderer); int ControlStream([In] ref Guid pCategory, [In] ref Guid pType, [In] IBaseFilter pFilter, [In] IntPtr pstart, [In] IntPtr pstop, [In] short wStartCookie, [In] short wStopCookie); int AllocCapFile([In, MarshalAs(UnmanagedType.LPWStr)] string lpstrFile, [In] long dwlSize); int CopyCaptureFile([In, MarshalAs(UnmanagedType.LPWStr)] string lpwstrOld, [In, MarshalAs(UnmanagedType.LPWStr)] string lpwstrNew, [In] int fAllowEscAbort, [In] IAMCopyCaptureFileProgress pFilter); int FindPin([In] object pSource, [In] int pindir, [In] ref Guid pCategory, [In] ref Guid pType, [In, MarshalAs(UnmanagedType.Bool)] bool fUnconnected, [In] int num, [Out] out IntPtr ppPin); } [ComVisible(true), ComImport(), Guid("a2104830-7c70-11cf-8bce-00aa00a3f1a6"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IFileSinkFilter { int SetFileName([In, MarshalAs(UnmanagedType.LPWStr)] string pszFileName, [In, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int GetCurFile([In, Out, MarshalAs(UnmanagedType.LPWStr)] ref string pszFileName, [Out, MarshalAs(UnmanagedType.LPStruct)] out AM_MEDIA_TYPE pmt); } [ComVisible(true), ComImport(), Guid("670d1d20-a068-11d0-b3f0-00aa003761c5"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IAMCopyCaptureFileProgress { int Progress(int iProgress); } [ComVisible(true), ComImport(), Guid("C6E13370-30AC-11d0-A18C-00A0C9118956"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IAMCameraControl { int GetRange([In] CameraControlProperty Property, [In, Out] ref int pMin, [In, Out] ref int pMax, [In, Out] ref int pSteppingDelta, [In, Out] ref int pDefault, [In, Out] ref int pCapsFlag); int Set([In] CameraControlProperty Property, [In] int lValue, [In] int Flags); int Get([In] CameraControlProperty Property, [In, Out] ref int lValue, [In, Out] ref int Flags); } [ComVisible(true), ComImport(), Guid("C6E13360-30AC-11d0-A18C-00A0C9118956"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IAMVideoProcAmp { int GetRange([In] VideoProcAmpProperty Property, [In, Out] ref int pMin, [In, Out] ref int pMax, [In, Out] ref int pSteppingDelta, [In, Out] ref int pDefault, [In, Out] ref int pCapsFlag); int Set([In] VideoProcAmpProperty Property, [In] int lValue, [In] int Flags); int Get([In] VideoProcAmpProperty Property, [In, Out] ref int lValue, [In, Out] ref int Flags); } [ComVisible(true), ComImport(), Guid("6A2E0670-28E4-11D0-A18C-00A0C9118956"), System.Security.SuppressUnmanagedCodeSecurity, InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IAMVideoControl { int GetCaps([In] IPin pPin, [Out] out int pCapsFlags); int SetMode([In] IPin pPin, [In] int Mode); int GetMode([In] IPin pPin, [Out] out int Mode); int GetCurrentActualFrameRate([In] IPin pPin, [Out] out long ActualFrameRate); int GetMaxAvailableFrameRate([In] IPin pPin, [In] int iIndex, [In] Size Dimensions, [Out] out long MaxAvailableFrameRate); int GetFrameRateList([In] IPin pPin, [In] int iIndex, [In] Size Dimensions, [Out] out int ListSize, [Out] out IntPtr FrameRates); } [ComVisible(true), ComImport(), Guid("56a86895-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IBaseFilter { // Inherits IPersist int GetClassID([Out] out Guid pClassID); // Inherits IMediaControl int Stop(); int Pause(); int Run(long tStart); int GetState(int dwMilliSecsTimeout, [In, Out] ref int filtState); int SetSyncSource([In] IReferenceClock pClock); int GetSyncSource([In, Out] ref IReferenceClock pClock); // ----- int EnumPins([In, Out] ref IEnumPins ppEnum); int FindPin([In, MarshalAs(UnmanagedType.LPWStr)] string Id, [In, Out] ref IPin ppPin); int QueryFilterInfo([Out] FILTER_INFO pInfo); int JoinFilterGraph([In] IFilterGraph pGraph, [In, MarshalAs(UnmanagedType.LPWStr)] string pName); int QueryVendorInfo([In, Out, MarshalAs(UnmanagedType.LPWStr)] ref string pVendorInfo); } [ComVisible(true), ComImport(), Guid("56a86893-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IEnumFilters { int Next([In] int cFilters, [In, Out] ref IBaseFilter ppFilter, [In, Out] ref int pcFetched); int Skip([In] int cFilters); void Reset(); void Clone([In, Out] ref IEnumFilters ppEnum); } [ComVisible(true), ComImport(), Guid("C6E13340-30AC-11d0-A18C-00A0C9118956"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IAMStreamConfig { int SetFormat([In, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int GetFormat([In, Out, MarshalAs(UnmanagedType.LPStruct)] ref AM_MEDIA_TYPE ppmt); int GetNumberOfCapabilities(ref int piCount, ref int piSize); int GetStreamCaps(int iIndex, [In, Out, MarshalAs(UnmanagedType.LPStruct)] ref AM_MEDIA_TYPE ppmt, IntPtr pSCC); } [ComVisible(true), ComImport(), Guid("56a8689a-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IMediaSample { int GetPointer(ref IntPtr ppBuffer); int GetSize(); int GetTime(ref long pTimeStart, ref long pTimeEnd); int SetTime([In, MarshalAs(UnmanagedType.LPStruct)] UInt64 pTimeStart, [In, MarshalAs(UnmanagedType.LPStruct)] UInt64 pTimeEnd); int IsSyncPoint(); int SetSyncPoint([In, MarshalAs(UnmanagedType.Bool)] bool bIsSyncPoint); int IsPreroll(); int SetPreroll([In, MarshalAs(UnmanagedType.Bool)] bool bIsPreroll); int GetActualDataLength(); int SetActualDataLength(int len); int GetMediaType([In, Out, MarshalAs(UnmanagedType.LPStruct)] ref AM_MEDIA_TYPE ppMediaType); int SetMediaType([In, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pMediaType); int IsDiscontinuity(); int SetDiscontinuity([In, MarshalAs(UnmanagedType.Bool)] bool bDiscontinuity); int GetMediaTime(ref long pTimeStart, ref long pTimeEnd); int SetMediaTime([In, MarshalAs(UnmanagedType.LPStruct)] UInt64 pTimeStart, [In, MarshalAs(UnmanagedType.LPStruct)] UInt64 pTimeEnd); } [ComVisible(true), ComImport(), Guid("89c31040-846b-11ce-97d3-00aa0055595a"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IEnumMediaTypes { int Next([In] int cMediaTypes, [In, Out, MarshalAs(UnmanagedType.LPStruct)] ref AM_MEDIA_TYPE ppMediaTypes, [In, Out] ref int pcFetched); int Skip([In] int cMediaTypes); int Reset(); int Clone([In, Out] ref IEnumMediaTypes ppEnum); } [ComVisible(true), ComImport(), Guid("56a86891-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IPin { int Connect([In] IPin pReceivePin, [In, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int ReceiveConnection([In] IPin pReceivePin, [In, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int Disconnect(); int ConnectedTo([In, Out] ref IPin ppPin); int ConnectionMediaType([Out, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int QueryPinInfo([Out] PIN_INFO pInfo); int QueryDirection(ref PIN_DIRECTION pPinDir); int QueryId([In, Out, MarshalAs(UnmanagedType.LPWStr)] ref string Id); int QueryAccept([In, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int EnumMediaTypes([In, Out] ref IEnumMediaTypes ppEnum); int QueryInternalConnections(IntPtr apPin, [In, Out] ref int nPin); int EndOfStream(); int BeginFlush(); int EndFlush(); int NewSegment(long tStart, long tStop, double dRate); } [ComVisible(true), ComImport(), Guid("56a86892-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IEnumPins { int Next([In] int cPins, [In, Out] ref IPin ppPins, [In, Out] ref int pcFetched); int Skip([In] int cPins); void Reset(); void Clone([In, Out] ref IEnumPins ppEnum); } [ComVisible(true), ComImport(), Guid("56a86897-0ad4-11ce-b03a-0020af0ba770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IReferenceClock { int GetTime(ref long pTime); int AdviseTime(long baseTime, long streamTime, IntPtr hEvent, ref int pdwAdviseCookie); int AdvisePeriodic(long startTime, long periodTime, IntPtr hSemaphore, ref int pdwAdviseCookie); int Unadvise(int dwAdviseCookie); } [ComVisible(true), ComImport(), Guid("29840822-5B84-11D0-BD3B-00A0C911CE86"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface ICreateDevEnum { int CreateClassEnumerator([In] ref Guid pType, [In, Out] ref System.Runtime.InteropServices.ComTypes.IEnumMoniker ppEnumMoniker, [In] int dwFlags); } [ComVisible(true), ComImport(), Guid("55272A00-42CB-11CE-8135-00AA004BB851"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IPropertyBag { int Read([MarshalAs(UnmanagedType.LPWStr)] string PropName, ref object Var, int ErrorLog); int Write(string PropName, ref object Var); } [ComVisible(true), ComImport(), Guid("6B652FFF-11FE-4fce-92AD-0266B5D7C78F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface ISampleGrabber { int SetOneShot([In, MarshalAs(UnmanagedType.Bool)] bool OneShot); int SetMediaType([In, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int GetConnectedMediaType([Out, MarshalAs(UnmanagedType.LPStruct)] AM_MEDIA_TYPE pmt); int SetBufferSamples([In, MarshalAs(UnmanagedType.Bool)] bool BufferThem); int GetCurrentBuffer(ref int pBufferSize, IntPtr pBuffer); int GetCurrentSample(IntPtr ppSample); int SetCallback(ISampleGrabberCB pCallback, int WhichMethodToCallback); } [ComVisible(true), ComImport(), Guid("0579154A-2B53-4994-B0D0-E773148EFF85"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface ISampleGrabberCB { [PreserveSig()] int SampleCB(double SampleTime, IMediaSample pSample); [PreserveSig()] int BufferCB(double SampleTime, IntPtr pBuffer, int BufferLen); } #endregion #region Structure [Serializable] [StructLayout(LayoutKind.Sequential), ComVisible(false)] public class AM_MEDIA_TYPE { public Guid MajorType; public Guid SubType; [MarshalAs(UnmanagedType.Bool)] public bool bFixedSizeSamples; [MarshalAs(UnmanagedType.Bool)] public bool bTemporalCompression; public uint lSampleSize; public Guid FormatType; public IntPtr pUnk; public uint cbFormat; public IntPtr pbFormat; } [Serializable] [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode), ComVisible(false)] public class FILTER_INFO { [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)] public string achName; [MarshalAs(UnmanagedType.IUnknown)] public object pGraph; } [Serializable] [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode), ComVisible(false)] public class PIN_INFO { public IBaseFilter pFilter; public PIN_DIRECTION dir; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)] public string achName; } [Serializable] [StructLayout(LayoutKind.Sequential, Pack = 8), ComVisible(false)] public struct VIDEO_STREAM_CONFIG_CAPS { public Guid Guid; public uint VideoStandard; public SIZE InputSize; public SIZE MinCroppingSize; public SIZE MaxCroppingSize; public int CropGranularityX; public int CropGranularityY; public int CropAlignX; public int CropAlignY; public SIZE MinOutputSize; public SIZE MaxOutputSize; public int OutputGranularityX; public int OutputGranularityY; public int StretchTapsX; public int StretchTapsY; public int ShrinkTapsX; public int ShrinkTapsY; public long MinFrameInterval; public long MaxFrameInterval; public int MinBitsPerSecond; public int MaxBitsPerSecond; } [Serializable] [StructLayout(LayoutKind.Sequential), ComVisible(false)] public struct VIDEOINFOHEADER { public RECT SrcRect; public RECT TrgRect; public int BitRate; public int BitErrorRate; public long AvgTimePerFrame; public BITMAPINFOHEADER bmiHeader; } [Serializable] [StructLayout(LayoutKind.Sequential), ComVisible(false)] public struct VIDEOINFOHEADER2 { public RECT SrcRect; public RECT TrgRect; public int BitRate; public int BitErrorRate; public long AvgTimePerFrame; public int InterlaceFlags; public int CopyProtectFlags; public int PictAspectRatioX; public int PictAspectRatioY; public int ControlFlags; // or Reserved1 public int Reserved2; public BITMAPINFOHEADER bmiHeader; } [Serializable] [StructLayout(LayoutKind.Sequential, Pack = 2), ComVisible(false)] public struct BITMAPINFOHEADER { public int biSize; public int biWidth; public int biHeight; public short biPlanes; public short biBitCount; public int biCompression; public int biSizeImage; public int biXPelsPerMeter; public int biYPelsPerMeter; public int biClrUsed; public int biClrImportant; } [Serializable] [StructLayout(LayoutKind.Sequential), ComVisible(false)] public struct WAVEFORMATEX { public ushort wFormatTag; public ushort nChannels; public uint nSamplesPerSec; public uint nAvgBytesPerSec; public short nBlockAlign; public short wBitsPerSample; public short cbSize; } [Serializable] [StructLayout(LayoutKind.Sequential, Pack = 8), ComVisible(false)] public struct SIZE { public int cx; public int cy; public override string ToString() { return string.Format("{{{0}, {1}}}", cx, cy); } // for debugging. } [Serializable] [StructLayout(LayoutKind.Sequential), ComVisible(false)] public struct RECT { public int Left; public int Top; public int Right; public int Bottom; public override string ToString() { return string.Format("{{{0}, {1}, {2}, {3}}}", Left, Top, Right, Bottom); } // for debugging. } #endregion #region Enum [ComVisible(false)] public enum PIN_DIRECTION { PINDIR_INPUT = 0, PINDIR_OUTPUT = 1, } [ComVisible(false)] public enum FILTER_STATE : int { Stopped = 0, Paused = 1, Running = 2, } [ComVisible(false)] public enum CameraControlProperty { Pan = 0, Tilt = 1, Roll = 2, Zoom = 3, Exposure = 4, Iris = 5, Focus = 6, } [ComVisible(false), Flags()] public enum CameraControlFlags { Auto = 0x0001, Manual = 0x0002, } [ComVisible(false)] public enum VideoProcAmpProperty { Brightness = 0, Contrast = 1, Hue = 2, Saturation = 3, Sharpness = 4, Gamma = 5, ColorEnable = 6, WhiteBalance = 7, BacklightCompensation = 8, Gain = 9 } #endregion #region Guid public static class DsGuid { // MediaType public static readonly Guid MEDIATYPE_Video = new Guid("{73646976-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIATYPE_Audio = new Guid("{73647561-0000-0010-8000-00AA00389B71}"); // SubType public static readonly Guid MEDIASUBTYPE_None = new Guid("{E436EB8E-524F-11CE-9F53-0020AF0BA770}"); public static readonly Guid MEDIASUBTYPE_YUYV = new Guid("{56595559-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIASUBTYPE_IYUV = new Guid("{56555949-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIASUBTYPE_YVU9 = new Guid("{39555659-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIASUBTYPE_YUY2 = new Guid("{32595559-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIASUBTYPE_YVYU = new Guid("{55595659-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIASUBTYPE_UYVY = new Guid("{59565955-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIASUBTYPE_MJPG = new Guid("{47504A4D-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIASUBTYPE_RGB565 = new Guid("{E436EB7B-524F-11CE-9F53-0020AF0BA770}"); public static readonly Guid MEDIASUBTYPE_RGB555 = new Guid("{E436EB7C-524F-11CE-9F53-0020AF0BA770}"); public static readonly Guid MEDIASUBTYPE_RGB24 = new Guid("{E436EB7D-524F-11CE-9F53-0020AF0BA770}"); public static readonly Guid MEDIASUBTYPE_RGB32 = new Guid("{E436EB7E-524F-11CE-9F53-0020AF0BA770}"); public static readonly Guid MEDIASUBTYPE_ARGB32 = new Guid("{773C9AC0-3274-11D0-B724-00AA006C1A01}"); public static readonly Guid MEDIASUBTYPE_PCM = new Guid("{00000001-0000-0010-8000-00AA00389B71}"); public static readonly Guid MEDIASUBTYPE_WAVE = new Guid("{E436EB8B-524F-11CE-9F53-0020AF0BA770}"); // FormatType public static readonly Guid FORMAT_None = new Guid("{0F6417D6-C318-11D0-A43F-00A0C9223196}"); public static readonly Guid FORMAT_VideoInfo = new Guid("{05589F80-C356-11CE-BF01-00AA0055595A}"); public static readonly Guid FORMAT_VideoInfo2 = new Guid("{F72A76A0-EB0A-11d0-ACE4-0000C0CC16BA}"); public static readonly Guid FORMAT_WaveFormatEx = new Guid("{05589F81-C356-11CE-BF01-00AA0055595A}"); // CLSID public static readonly Guid CLSID_AudioInputDeviceCategory = new Guid("{33D9A762-90C8-11d0-BD43-00A0C911CE86}"); public static readonly Guid CLSID_AudioRendererCategory = new Guid("{E0F158E1-CB04-11d0-BD4E-00A0C911CE86}"); public static readonly Guid CLSID_VideoInputDeviceCategory = new Guid("{860BB310-5D01-11d0-BD3B-00A0C911CE86}"); public static readonly Guid CLSID_VideoCompressorCategory = new Guid("{33D9A760-90C8-11d0-BD43-00A0C911CE86}"); public static readonly Guid CLSID_NullRenderer = new Guid("{C1F400A4-3F08-11D3-9F0B-006008039E37}"); public static readonly Guid CLSID_SampleGrabber = new Guid("{C1F400A0-3F08-11D3-9F0B-006008039E37}"); public static readonly Guid CLSID_FilterGraph = new Guid("{E436EBB3-524F-11CE-9F53-0020AF0BA770}"); public static readonly Guid CLSID_SystemDeviceEnum = new Guid("{62BE5D10-60EB-11d0-BD3B-00A0C911CE86}"); public static readonly Guid CLSID_CaptureGraphBuilder2 = new Guid("{BF87B6E1-8C27-11d0-B3F0-00AA003761C5}"); public static readonly Guid IID_IPropertyBag = new Guid("{55272A00-42CB-11CE-8135-00AA004BB851}"); public static readonly Guid IID_IBaseFilter = new Guid("{56a86895-0ad4-11ce-b03a-0020af0ba770}"); public static readonly Guid IID_IAMStreamConfig = new Guid("{C6E13340-30AC-11d0-A18C-00A0C9118956}"); public static readonly Guid PIN_CATEGORY_CAPTURE = new Guid("{fb6c4281-0353-11d1-905f-0000c0cc16ba}"); public static readonly Guid PIN_CATEGORY_PREVIEW = new Guid("{fb6c4282-0353-11d1-905f-0000c0cc16ba}"); public static readonly Guid PIN_CATEGORY_STILL = new Guid("{fb6c428a-0353-11d1-905f-0000c0cc16ba}"); private static Dictionary NicknameCache = null; public static string GetNickname(Guid guid) { if (NicknameCache == null) { NicknameCache = typeof(DsGuid).GetFields(System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public) .Where(x => x.FieldType == typeof(Guid)) .ToDictionary(x => (Guid)x.GetValue(null), x => x.Name); } if (NicknameCache.ContainsKey(guid)) { var name = NicknameCache[guid]; var elem = name.Split('_'); if (elem.Length >= 2) { var text = string.Join("_", elem.Skip(1).ToArray()); return string.Format("[{0}]", text); } else { return name; } } return guid.ToString(); } } #endregion } }使用非常简单：
//获取所有的摄像头 string[] devices = UsbCamera.FindDevices(); //获取摄像头支持的分辨率 int cameraIndex = 0; UsbCamera.VideoFormat[] formats = UsbCamera.GetVideoFormat(cameraIndex); for (int i = 0; i < formats.Length; i++) Console.WriteLine("{0}:{1}", i, formats[i]); // create usb camera and start. using var camera = new UsbCamera(cameraIndex, formats[0]); camera.Start(); //第一次截图不延迟的话，会出现黑屏 await Task.Delay(100); var bmp = camera.GetBitmap(); bmp.Save(@$"r:\test.jpg");这个代码本身也是封装了direct show，但它只封装了摄像头相关的部分，只有1k多行，可以直接嵌入到项目中。 另外，这个截图本身不依赖于STA线程的，可以非常方便的封装成一个远程usb拍照的功能的，也可以供web使用。 如果不太要求效果的话，做个远程的摄像头也是可以的。
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