关于DirectShowLib视频采集的用法。高手进来帮帮忙

[vipxiaoma]

DirectShowLib视频采集

 try
            {

                  int hr = 0;                  
                  hr = this.m_graphBuilder.AddFilter(theVideoDevice, "Video Capture");
                  DsError.ThrowExceptionForHR(hr);

                  // 通过theVideoDevice（IBaseFilter）视频接口对象的Preview Pin预览
                  hr = this.m_captureGraphBuilder.RenderStream(PinCategory.Preview, MediaType.Video, theVideoDevice, null, null);
                  //DsError.ThrowExceptionForHR(hr);

                  //插入SampleGrabber
                 m_pinStill = DsFindPin.ByCategory(theVideoDevice, PinCategory.Still, 0);

                  if (m_pinStill == null)
                  {
                      m_pinStill = DsFindPin.ByCategory(theVideoDevice, PinCategory.Capture, 0);
                  }


                  // 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
                  m_VidControl = theVideoDevice as IAMVideoControl;

                  // 设置采集视频参数
                  //if (this.Height + this.Width + this.Width > 0)
                  //{
                  //    SetConfigParms(m_pinStill, this.Width, this.Height, 24);
                  //}

                  //开始拍照功能所需的接口对象
                  // 获得SampleGrabber对象接口
                  sampGrabber = new SampleGrabber() as ISampleGrabber;

                  // 配置sample grabber
                  baseGrabFlt = sampGrabber as IBaseFilter;
                  // ConfigureSampleGrabber(sampGrabber);

                  // 将sample grabber添加到图形过滤器中
                  hr = m_graphBuilder.AddFilter(baseGrabFlt, "Ds.NET Grabber");
                  DsError.ThrowExceptionForHR(hr);

                  //    //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
                  //    //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
                  if (m_VidControl != null)
                  {
                      hr = this.m_captureGraphBuilder.RenderStream(PinCategory.Still, MediaType.Video, theVideoDevice, null, baseGrabFlt);
                      DsError.ThrowExceptionForHR(hr);

                  }
                  else
                  {
                      hr = this.m_captureGraphBuilder.RenderStream(PinCategory.Capture, MediaType.Video, theVideoDevice, null, baseGrabFlt);
                      DsError.ThrowExceptionForHR(hr);
                  }

                  //  //设置抓取图片相关参数
                  //  //  SaveSizeInfo(sampGrabber);
                  //  //拍照功能所需的接口对象添加结束


                  //// 开始将视频窗口绑定到主窗体上
                  hr = this.m_videoWindow.put_Owner(this.Handle);

                  hr = this.m_videoWindow.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipChildren);

                  if (this.m_videoWindow != null)
                  {
                      this.m_videoWindow.SetWindowPosition(0, 0, this.Width, this.Height);
                  }

                  //hr = this.m_videoWindow.put_Visible(OABool.True);

                  //// 开始预览采集设备采集到的视频
                  hr = this.m_mediaControl.Run();

            }
            catch
            {
                throw new Exception("VideoPreview函数出现异常，视频预览失败！");

            }

请问代码中

 if (m_VidControl != null)
                  {
                      hr = this.m_captureGraphBuilder.RenderStream(PinCategory.Still, MediaType.Video, theVideoDevice, null, baseGrabFlt);
                      DsError.ThrowExceptionForHR(hr);

                  }
                  else
                  {
                      hr = this.m_captureGraphBuilder.RenderStream(PinCategory.Capture, MediaType.Video, theVideoDevice, null, baseGrabFlt);
                      DsError.ThrowExceptionForHR(hr);
                  }

是否用来采集视频流？

[wsydm110]

...哥们我也在做这个，请问你DsFindPin.ByCategory这个函数是干什么用的，还有你是在哪查看一些函数的文档啊？我怕google都搜不到

[wsydm110]

还有这个类里面的

public static class PinCategory
    {
        public static readonly Guid AnalogVideoIn;
        public static readonly Guid Capture;
        public static readonly Guid CC;
        public static readonly Guid EDS;
        public static readonly Guid NABTS;
        public static readonly Guid Preview;
        public static readonly Guid Still;
        public static readonly Guid TeleText;
        public static readonly Guid TimeCode;
        public static readonly Guid VBI;
        public static readonly Guid VideoPort;
        public static readonly Guid VideoPortVBI;
    }

这些都是什么意思啊？

[yan2345678]

有全面的资料吗