directshow摄像头录像代码

最新推荐文章于 2024-03-29 19:23:20 发布

原创最新推荐文章于 2024-03-29 19:23:20 发布 · 2.3k 阅读

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#video #filter #null #application #avi

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本文档详细介绍了使用DirectShow进行摄像头录像的C++代码实现过程，包括设置CaptureGraphBuilder2，找到捕获设备，添加过滤器，设置输出文件以及连接源过滤器和渲染过滤器的步骤。在运行过程中，如果捕获设备已被其他应用使用，会给出相应错误提示。

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HRESULT Cvp::RecordPlay(CString szFile)
{
if(isStop!=m_status) Stop();
HRESULT hr;
CHECK_ERROR( GetInterfaces(),"GetInterfaces failed." );
CHECK_ERROR( CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC,
  IID_ICaptureGraphBuilder2, (void **) &m_pC) ,"CoCreateInstan ICaptureGraphBuilder2 failed:");
CHECK_ERROR( m_pC->SetFiltergraph(m_pG),"Failed to set capture filter graph.");

hr = FindCaptureDevice(&m_pBF);
    if (FAILED(hr))
      return hr;

if(m_pBF) hr=m_pG->AddFilter(m_pBF,L"Video Capture");
if(hr!=NOERROR)
{
  MessageBox(m_hWnd,"Cannot add vidcap to filtergraph./r/n/r/n"
        "If you have a working video capture device, please make sure/r/n"
        "that it is connected and is not being used by another application./r/n"
        "The application will now close.","Error",MB_OK);
  return hr;
}

IBaseFilter* pASFWriter = 0;
CHECK_ERROR( m_pC->SetOutputFileName(&MEDIASUBTYPE_Avi,CA2W(szFile),&pASFWriter,NULL),"Failed to setOutputFile");
//connect source filter with render filter
CHECK_ERROR( m_pC->RenderStream (&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,m_pBF, NULL, NULL),
               "Couldn't render the video capture stream./r/n"
               "The capture device may already be in use by another application./r/n"
               "The sample will now close.");
    CHECK_ERROR( m_pC->RenderStream (&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,m_pBF, NULL, pASFWriter),
               "Couldn't render the video capture stream./r/n"
               "The capture device may already be in use by another application./r/n"
               "The sample will now close.");

HELPER_RELEASE(m_pBF);
DisplayVideoWin();
CHECK_ERROR(m_pM->Run(),"Failed to run:");
m_status=isRecord;
return hr;
}