75 lines
2.6 KiB
C#
75 lines
2.6 KiB
C#
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using DirectShowLib;
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using System.Runtime.InteropServices;
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namespace DualScreenDemo.Services
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{
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public class Video
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{
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protected IBaseFilter AddFilterByClsid(IGraphBuilder graphBuilder, string name, Guid clsid)
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{
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try
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{
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Type filterType = Type.GetTypeFromCLSID(clsid);
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object filterObject = Activator.CreateInstance(filterType);
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IBaseFilter filter = filterObject as IBaseFilter;
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if (filter == null)
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{
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IntPtr comObjectPointer = Marshal.GetIUnknownForObject(filterObject);
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filter = (IBaseFilter)Marshal.GetObjectForIUnknown(comObjectPointer);
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}
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// 添加过滤器到图形构建器
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int hr = graphBuilder.AddFilter(filter, name);
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DsError.ThrowExceptionForHR(hr);
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return filter;
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Exception in AddFilterByClsid: {ex.Message}");
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throw; // Rethrow the exception to handle it further up the call stack
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}
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}
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protected int ConnectFilters(IGraphBuilder graphBuilder, IBaseFilter sourceFilter, string sourcePinName, IBaseFilter destFilter, string destPinName)
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{
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IPin outPin = FindPin(sourceFilter, sourcePinName);
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IPin inPin = FindPin(destFilter, destPinName);
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if (outPin == null || inPin == null)
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{
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Console.WriteLine(String.Format("Cannot find pins: {0} or {1}", sourcePinName, destPinName));
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return -1;
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}
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int hr = graphBuilder.Connect(outPin, inPin);
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return hr;
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}
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protected IPin FindPin(IBaseFilter filter, string pinName)
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{
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IEnumPins enumPins;
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IPin[] pins = new IPin[1];
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filter.EnumPins(out enumPins);
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enumPins.Reset();
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while (enumPins.Next(1, pins, IntPtr.Zero) == 0)
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{
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PinInfo pinInfo;
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pins[0].QueryPinInfo(out pinInfo);
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Console.WriteLine(pinInfo);
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if (pinInfo.name == pinName)
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{
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return pins[0];
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}
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}
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return null;
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}
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protected void SafeRelease<T>(ref T comObject) where T : class
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{
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if (comObject != null)
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{
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Marshal.ReleaseComObject(comObject);
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comObject = null;
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}
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}
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}
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}
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