DirectShow关掉自动曝光（手动设置曝光值）

DirectShow关掉自动曝光（手动设置曝光值）代码如下所示：

IBaseFilter* pBF;
// Bind Device Filter. We know the device because the id was passed in
if (!BindFilter(iDeviceID, &pBF)) {
  return S_FALSE;
}

IAMCameraControl *pCtrl;
pBF->QueryInterface(IID_IAMCameraControl, (void **)&pCtrl );
pCtrl->Set( CameraControl_Exposure, -10, CameraControl_Flags_Manual );  // -10为手动设置的曝光值

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