/// <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);
}
}
/// <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);
}
