/// <summary>
        /// 初始化设备
        /// </summary>
        private bool InitDevice()
        {
            try
            {
                //检查DirectX版本
                if (!TestManager.IsCorrectDirectXVersion())
                {
                    throw new Exception("未安装DirectX 8.1!");
                }

                //如果摄像头不存在则抛出异常
                if (_bindCameraName == null || string.IsNullOrEmpty(_bindCameraName))
                {
                    throw new Exception("请指定要使用的摄像头!");
                }


                //如果指定的音频不存在则抛出异常
                if (_bindAudioName == null || string.IsNullOrEmpty(_bindAudioName))
                {
                    throw new Exception("请指定要使用的录音设备!");
                }

                var dsVideoDevice = TestManager.GetAllVideoDevice();

                _theCamera = TestManager.CreateFilter(dsVideoDevice, _bindCameraName);
                if (_theCamera == null)
                {
                    MessageBox.Show("输入摄像机名称不存在!");
                }


                var dsAudioDevice = TestManager.GetAllAudioDevice();
                _theAudio = TestManager.CreateFilter(dsAudioDevice, _bindAudioName);//获取音频设备IBaseFilter
                if (_theAudio == null)
                {
                    MessageBox.Show("输入音频设备不存在!");
                }
                return(true);
            }
            catch (Exception ex)
            {
                MessageBox.Show("初始化设备失败:" + ex.Message);
                return(false);
            }
        }
Beispiel #2
0
        /// <summary>
        /// 获取指定摄像头支持的分辨率
        /// </summary>
        /// <param name="CameraName">摄像头的名称</param>
        /// <returns></returns>
        public static List <string> GetCameraSupportResolution(string CameraName)
        {
            DsDevice[]  dsVideoDevice = GetAllVideoDevice();
            IBaseFilter theCamera     = TestManager.CreateFilter(dsVideoDevice, CameraName);

            IFilterGraph2         graphBuilder        = (IFilterGraph2) new FilterGraph();                  // 获取IFilterGraph2接口对象
            ICaptureGraphBuilder2 captureGraphBuilder = (ICaptureGraphBuilder2) new CaptureGraphBuilder2(); //获取ICaptureGraphBuilder2接口对象
            int hr = captureGraphBuilder.SetFiltergraph(graphBuilder);                                      //将过滤器图形附加到捕获图

            DsError.ThrowExceptionForHR(hr);
            //将视频输入设备添加到图形
            hr = graphBuilder.AddFilter(theCamera, "source filter");
            DsError.ThrowExceptionForHR(hr);

            //AMMediaType mediaType = new AMMediaType();
            //IntPtr pmt = IntPtr.Zero;
            //object oVideoStreamConfig;//视频流配置信息
            //hr = captureGraphBuilder.FindInterface(PinCategory.Capture, MediaType.Video, theCamera, typeof(IAMStreamConfig).GUID, out oVideoStreamConfig);
            //if (!(oVideoStreamConfig is IAMStreamConfig videoStreamConfig))
            //{
            //    throw new Exception("Failed to get IAMStreamConfig");
            //}


            List <string> AvailableResolutions = new List <string>();
            object        streamConfig;

            // 获取配置接口
            hr = captureGraphBuilder.FindInterface(PinCategory.Capture,
                                                   MediaType.Video,
                                                   theCamera,
                                                   typeof(IAMStreamConfig).GUID,
                                                   out streamConfig);

            Marshal.ThrowExceptionForHR(hr);

            var videoStreamConfig = streamConfig as IAMStreamConfig;


            if (videoStreamConfig == null)
            {
                throw new Exception("Failed to get IAMStreamConfig");
            }
            var videoInfo = new VideoInfoHeader();
            int iCount;
            int iSize;
            int bitCount = 0;

            //IAMStreamConfig::GetNumberOfCapabilities获得设备所支持的媒体类型的数量。这个方法返回两个值,一个是媒体类型的数量,二是属性所需结构的大小。
            hr = videoStreamConfig.GetNumberOfCapabilities(out iCount, out iSize);
            Marshal.ThrowExceptionForHR(hr);
            IntPtr      TaskMemPointer = Marshal.AllocCoTaskMem(iSize);
            AMMediaType pmtConfig      = null;

            for (int iFormat = 0; iFormat < iCount; iFormat++)
            {
                IntPtr ptr = IntPtr.Zero;
                //通过函数IAMStreamConfig::GetStreamCaps来枚举媒体类型,要给这个函数传递一个序号作为参数,这个函数返回媒体类型和相应的属性结构体
                videoStreamConfig.GetStreamCaps(iFormat, out ptr, TaskMemPointer);

                pmtConfig = (AMMediaType)Marshal.PtrToStructure(ptr, typeof(AMMediaType));

                videoInfo = (VideoInfoHeader)Marshal.PtrToStructure(pmtConfig.formatPtr, typeof(VideoInfoHeader));

                if (videoInfo.BmiHeader.Size != 0 && videoInfo.BmiHeader.BitCount != 0)
                {
                    if (videoInfo.BmiHeader.BitCount > bitCount)
                    {
                        AvailableResolutions.Clear();
                        bitCount = videoInfo.BmiHeader.BitCount;
                    }
                    AvailableResolutions.Add(videoInfo.BmiHeader.Width + "*" + videoInfo.BmiHeader.Height);
                }
            }

            return(AvailableResolutions);
        }