directshow 之视频控制

最新推荐文章于 2022-03-23 09:27:47 发布

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最新推荐文章于 2022-03-23 09:27:47 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/cngreatwall/archive/2011/09/02/2163546.html

本文详细阐述了视频源播放和停止过程中的关键步骤，包括初始化、渲染视频流、控制流状态以及停止播放操作。

HRESULT CVideoSource::RenderStream( )
{
//CoInitialize(NULL);
HRESULT hr = NULL;
hr=m_pBuilder->RenderStream(
   &PIN_CATEGORY_PREVIEW,  //&PIN_CATEGORY_CAPTURE, // Pin category
   &MEDIATYPE_Video,       // Media type
   m_pVideoCap,                   // Capture filter
   NULL, //m_pVidCompress,                   // Compression filter (optional)
   NULL //m_pVideoRender                     // Multiplexer or renderer filter
   );


if(hr == VFW_S_NOPREVIEWPIN)
{
  // preview was faked up for us using the (only) capture pin
  //gcap.fPreviewFaked = TRUE;
}
else if(hr != S_OK)
{
  ErrMsg(TEXT("该视频卡不能进行视频浏览，请检查!"));
}
/*
hr = m_pGrapher->QueryInterface(IID_IVideoWindow, (void **)&m_pVidWin);
RECT rc;
m_pVidWin->put_Owner((OAHWND)AfxGetMainWnd()->m_hWnd);    // We own the window now
m_pVidWin->put_WindowStyle(WS_CHILD);    // you are now a child

// give the preview window all our space but where the status bar is
GetClientRect(AfxGetMainWnd()->m_hWnd, &rc);

m_pVidWin->SetWindowPosition(0, 0, rc.right, rc.bottom); // be this big
m_pVidWin->put_Visible(OATRUE);
*/

//hr=m_pBuilder->RenderStream(
// &PIN_CATEGORY_CAPTURE, // Pin category
// &MEDIATYPE_Video,       // Media type
// m_pVideoCap,                   // Capture filter
// NULL,//m_pVidCompress,                   // Compression filter (optional)
// m_pVideoRender                     // Multiplexer or renderer filter
// );

return hr;
}

HRESULT CVideoSource::Stop()
{
// TODO: Add your implementation code here
HRESULT hr = NULL;
//REFERENCE_TIME t=0x7FFFFFFFFFFFFFFF;
//HRESULT hr=m_pBuilder->ControlStream(
// &PIN_CATEGORY_CAPTURE,//const GUID *pCategory,
// NULL,//const GUID *pType,
// NULL,//IBaseFilter *pFilter,
// &t,//REFERENCE_TIME *pstart,
// NULL,//REFERENCE_TIME *pstop,
// 0,//WORD wStartCookie,
// 0//WORD wStopCookie
// );
//// return hr;

IMediaControl *pMediaControl;
// HRESULT hr=m_pGraph->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
hr=m_pGrapher->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
if(hr==S_OK){
pMediaControl->Stop();
pMediaControl->Release();
}
return hr;

}
HRESULT CVideoSource::Play()
{
// TODO: Add your implementation code here
//REFERENCE_TIME t=0x7FFFFFFFFFFFFFFF;
//m_pBuilder->ControlStream(
// &PIN_CATEGORY_CAPTURE,//const GUID *pCategory,
// NULL,//const GUID *pType,
// NULL,//IBaseFilter *pFilter,
// NULL,//REFERENCE_TIME *pstart,
// &t,//REFERENCE_TIME *pstop,
// 0,//WORD wStartCookie,
// 0//WORD wStopCookie
// );

IMediaControl *pMediaControl;
HRESULT hr=m_pGrapher->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
if(hr==S_OK){
pMediaControl->Run();
pMediaControl->Release();
}
return hr;
}

转载于:https://www.cnblogs.com/cngreatwall/archive/2011/09/02/2163546.html