DirectShowLib directshownet 视频

  1 using DirectShowLib;
  2 using System;
  3 using System.Collections;
  4 using System.Windows.Forms;
  5 
  6 namespace CaptureTest
  7 {
  8     public partial class Form1 : Form
  9     {
 10         private IBaseFilter theVideoDevice;
 11         private IBaseFilter baseGrabFlt ;  
 12         private int videoHeight;
 13         private int videoWidth;
 14         private int videoStride;
 15         private int WM_GRAPHNOTIFY; 
 16         private ICaptureGraphBuilder2   m_captureGraphBuilder;
 17         private IAMVideoControl         m_VidControl;
 18         private IVideoWindow            m_videoWindow;
 19         private IMediaControl           m_mediaControl;
 20         private IGraphBuilder           m_graphBuilder;
 21         private IMediaEventEx           m_mediaEventEx;
 22         private IntPtr hwnVideoWindowOwner;
 23         private IntPtr hwnPropertyPageOwner;
 24         private bool m_IsPreview;
 25 
 26         public Form1()
 27         {
 28             InitializeComponent();
 29         }
 30 
 31         //1、获取视频采集设备IBaseFilter接口对象的方法
 32 
 33         //获取所有视频设备名称
 34         public ArrayList GetVideoInputDevice()
 35         { return GetDeviceCollection(FilterCategory.VideoInputDevice); }
 36         private ArrayList GetDeviceCollection(Guid DeviceType)
 37         {
 38             ArrayList returnString = new ArrayList();
 39             foreach (DsDevice ds in DsDevice.GetDevicesOfCat(DeviceType))
 40             {
 41                 returnString.Add(ds.Name);
 42             }
 43             return returnString;
 44         }
 45 
 46         //通过获取到的视频设备名称设置采集设备的IBaseFilter对象
 47         public bool SetVideoInputDevice(string VideoInputDeviceName)
 48         {    //创建视频输入设备接口
 49             theVideoDevice = CreateFilter(FilterCategory.VideoInputDevice, VideoInputDeviceName);
 50             return true;
 51         }
 52         //通过过滤器类型和过滤器名称获取IBaseFilter接口
 53         private IBaseFilter CreateFilter(Guid category, string friendlyname)
 54         {
 55             object source = null;
 56             Guid iid = typeof(IBaseFilter).GUID;
 57             foreach (DsDevice device in DsDevice.GetDevicesOfCat(category))
 58             {
 59                 if (device.Name.CompareTo(friendlyname) == 0)
 60                 {
 61                     device.Mon.BindToObject(null, null, ref iid, out source);
 62                     break;
 63                 }
 64             }
 65 
 66             return (IBaseFilter)source;
 67         }
 68 
 69         //2、初始化基本的接口对象
 70 
 71         private void InitInterfaces()
 72         {
 73             int hr = 0;
 74 
 75             // 获取IGraphBuilder接口对象
 76             this.m_graphBuilder = (IGraphBuilder)new FilterGraph();
 77             //获取ICaptureGraphBuilder2接口对象
 78             this.m_captureGraphBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
 79             //获取m_graphBuilder 接口对象的IMediaControl对象
 80             this.m_mediaControl = (IMediaControl)this.m_graphBuilder;
 81             //获取m_graphBuilder 接口对象的IVideoWindow对象
 82             this.m_videoWindow = (IVideoWindow)this.m_graphBuilder;
 83             //获取m_graphBuilder 接口对象的IMediaEventEx对象
 84             this.m_mediaEventEx = (IMediaEventEx)this.m_graphBuilder;
 85             //设置ICaptureGraphBuilder2的IGraphBuilder接口对象为当前对象
 86             hr = this.m_captureGraphBuilder.SetFiltergraph(this.m_graphBuilder);
 87             DsError.ThrowExceptionForHR(hr);
 88             //注册事件到应用程序的窗体上
 89             hr = this.m_mediaEventEx.SetNotifyWindow(this.hwnPropertyPageOwner, WM_GRAPHNOTIFY, IntPtr.Zero);
 90             DsError.ThrowExceptionForHR(hr);
 91         }
 92          
 93         //3、开始视频预览
 94         public void VideoPreview()
 95         {
 96             try
 97             {
 98 
 99                 int hr = 0;
100                 hr = this.m_graphBuilder.AddFilter(theVideoDevice, "Video Capture");
101                 DsError.ThrowExceptionForHR(hr);
102 
103                 // 通过theVideoDevice（IBaseFilter）视频接口对象的Preview Pin预览
104                 hr = this.m_captureGraphBuilder.RenderStream(PinCategory.Preview, MediaType.Video, theVideoDevice, null, null);
105                 DsError.ThrowExceptionForHR(hr);
106                 var
107 
108                                 //插入SampleGrabber 
109                                 m_pinStill = DsFindPin.ByCategory(theVideoDevice, PinCategory.Still, 0);
110                 if (m_pinStill == null)
111                 {
112                     m_pinStill = DsFindPin.ByCategory(theVideoDevice, PinCategory.Capture, 0);
113                 }
114 
115 
116                 // 获取theVideoDevice的IAMVideoControl对象，对于具有Still Pin的对象可以获到，采集设备不具备Still Pin，那么该对象将为Null
117                 m_VidControl = theVideoDevice as IAMVideoControl;
118 
119                 // 设置采集视频参数
120                 if (this.videoHeight + this.videoWidth + this.videoStride > 0)
121                 {
122                     SetConfigParms(m_pinStill, this.videoWidth, this.videoHeight, 24);
123                 }
124 
125                 var
126 
127                                 //开始拍照功能所需的接口对象
128                                 // 获得SampleGrabber对象接口
129                                 sampGrabber = new SampleGrabber() as ISampleGrabber;
130 
131                 // 配置sample grabber
132                 baseGrabFlt = sampGrabber as IBaseFilter;
133                 ConfigureSampleGrabber(sampGrabber);
134 
135                 // 将sample grabber添加到图形过滤器中
136                 hr = m_graphBuilder.AddFilter(baseGrabFlt, "Ds.NET Grabber");
137                 DsError.ThrowExceptionForHR(hr);
138 
139                 //通过渲染将采集设备的相关输出Pin与sample grabber对象的输入Pin连接起来
140                 //如果采集设备提供Still Pin，则通过Still Pin连接，否则直接使用Capture Pin连接
141                 if (m_VidControl != null)
142                 {
143                     hr = this.m_captureGraphBuilder.RenderStream(PinCategory.Still, MediaType.Video, theVideoDevice, null, baseGrabFlt);
144                     DsError.ThrowExceptionForHR(hr);
145 
146                 }
147                 else
148                 {
149                     hr = this.m_captureGraphBuilder.RenderStream(PinCategory.Capture, MediaType.Video, theVideoDevice, null, baseGrabFlt);
150                     DsError.ThrowExceptionForHR(hr);
151                 }
152                 //设置抓取图片相关参数
153                 SaveSizeInfo(sampGrabber);
154                 //拍照功能所需的接口对象添加结束
155 
156 
157                 // 开始将视频窗口绑定到主窗体上
158                 hr = this.m_videoWindow.put_Owner(this.hwnVideoWindowOwner);
159                 DsError.ThrowExceptionForHR(hr);
160 
161                 hr = this.m_videoWindow.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipChildren);
162                 DsError.ThrowExceptionForHR(hr);
163 
164                 if (this.m_videoWindow != null)
165                 {
166                     this.m_videoWindow.SetWindowPosition(0, 0, this.videoWidth, this.videoHeight);
167                 }
168 
169 
170                 hr = this.m_videoWindow.put_Visible(OABool.True);
171                 DsError.ThrowExceptionForHR(hr);
172 
173                 // 开始预览采集设备采集到的视频
174                 hr = this.m_mediaControl.Run();
175 
176                 DsError.ThrowExceptionForHR(hr);
177                 m_IsPreview = true;
178             }
179             catch
180             {
181                 m_IsPreview = false;
182                 throw new Exception("VideoPreview函数出现异常，视频预览失败！");
183 
184             }
185         }
186 
187         private void SaveSizeInfo(ISampleGrabber sampGrabber)
188         {
189             throw new NotImplementedException();
190         }
191 
192         private void SetConfigParms(object m_pinStill, int videoWidth, int videoHeight, int v)
193         {
194             throw new NotImplementedException();
195         }
196 
197         private void ConfigureSampleGrabber(ISampleGrabber sampGrabber)
198         {
199             throw new NotImplementedException();
200         }
201     }
202 }