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前提： 摄像头能正常工作、摄像头有创建directshow filter
即 
大家能够对照我的还有一篇文章学习： wince系统下DirectShow採集摄像头
一、初始化工作
1、DirctShow环境初始化
bool
uEye_DirectShow_Demo_Dlg::DirectShow_Init()
{
// initialize the COM library on the current thread
HRESULT err= CoInitialize(NULL);
if( FAILED(err))
{
MessageBoxEx( NULL, "Initializing COM library failed!", __FUNCTION__, MB_ICONERROR, 0);
}
return err == S_OK;
}
2、搜索Video源
假设没有设备接入，那么CreateClassEnumerator会返回失败
bool
uEye_DirectShow_Demo_Dlg::VideoSourcesList_Fill()
{
HRESULT status= S_OK;
// create System Device Enumerator
ICreateDevEnum *pSystemDeviceEnumerator= NULL;
status= CoCreateInstance( CLSID_SystemDeviceEnum,
NULL,
CLSCTX_INPROC,
IID_ICreateDevEnum,
(void**)&pSystemDeviceEnumerator);
if( FAILED(status))
{
MessageBoxEx( NULL, "Creating System Device Enumerator failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
// create Class Enumerator that lists alls video input devices among the system devices
IEnumMoniker *pVideoInputDeviceEnumerator= NULL;
status= pSystemDeviceEnumerator->CreateClassEnumerator( CLSID_VideoInputDeviceCategory,
&pVideoInputDeviceEnumerator,
0);
// release the System Device Enumerator which is not needed anymore
pSystemDeviceEnumerator->Release();
pSystemDeviceEnumerator= NULL;
if( status != S_OK)
{
MessageBoxEx( NULL, "Creating Class Enumerator failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
// add entry '[no device selected]' to list
m_comboVideoSources.AddString( "[no device selected]");
m_comboVideoSources.SetItemDataPtr( 0, NULL);
// for each enumerated video input device: add it to the list
IMoniker *pMoniker= NULL;
while( pVideoInputDeviceEnumerator->Next( 1, &pMoniker, NULL) == S_OK )
{
VARIANT var;
VariantInit(&var);
// make filters properties accessible
IPropertyBag *pPropBag= NULL;
status= pMoniker->BindToStorage( 0, 0, IID_IPropertyBag, (void**)&pPropBag);
if( FAILED(status))
{
pPropBag= NULL;
MessageBoxEx( NULL, "Accessing filter properties failed!", __FUNCTION__, MB_ICONERROR, 0);
// continue with the next filter
}
else
{
// add a reference to the storage object
pPropBag->AddRef();
// get the name of this filter
status= pPropBag->Read( L"FriendlyName", &var, 0);
if( FAILED(status))
{
MessageBoxEx( NULL, "Reading filter name failed!", __FUNCTION__, MB_ICONERROR, 0);
// continue with the next filter
}
else
{
// if uEye Capture Device:
// add filtername to the list and link the moniker pointer to the list entry
CString sTemp(var.bstrVal);
#if (0) /* jma [04/08/2010] add devices named UI... too */
if( sTemp.Find( "uEye Capture Device", 0) != -1)
#endif
if ((sTemp.Find( "uEye Capture Device", 0) != -1) || (sTemp.Find( "UI", 0) != -1))
{
int index = m_comboVideoSources.AddString( sTemp);
// dont forget to release the moniker later!
m_comboVideoSources.SetItemDataPtr( index, pMoniker);
}
else
{
pMoniker->Release();
pMoniker= NULL;
}
}
// release the reference to the storage object
pPropBag->Release();
pPropBag= NULL;
}
VariantClear(&var);
}
// release the class enumerator
pVideoInputDeviceEnumerator->Release();
pVideoInputDeviceEnumerator= NULL;
// select first list entry
m_comboVideoSources.SetCurSel( 0);
return false;
}
二、选择某个摄像设备
1、先停止原有的Media
bool
uEye_DirectShow_Demo_Dlg::FilterGraph_Stop()
{
Invalidate();
// proceed only if filter graph manager object present
if( m_pActiveFilterGraphManager == NULL)
{
return true;
}
HRESULT status= S_OK;
// get the MediaControl interface of the graph
IMediaControl* pMediaControl= NULL;
status= m_pActiveFilterGraphManager->QueryInterface( IID_IMediaControl, (void**)&pMediaControl);
if( FAILED(status) || pMediaControl == NULL)
{
MessageBoxEx( NULL, "Querying MediaControl interface of the filter graph manager failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
//// check for graph to be executing before allowing to stop
//OAFilterState filterState= 0; // OAFilterState is actually a long
//status= pMediaControl->GetState( 100, &filterState);
//if( FAILED(status))
//{
// // cleanup
// // release the MediaControl interface object
// pMediaControl->Release();
// pMediaControl= NULL;
// MessageBoxEx( NULL, "Querying graph state failed!", __FUNCTION__, MB_ICONERROR, 0);
// return false;
//}
//if( filterState != State_Stopped)
{
// stop the execution of the graph
status= pMediaControl->Stop();
if( FAILED(status))
{
// cleanup
// release the MediaControl interface object
pMediaControl->Release();
pMediaControl= NULL;
MessageBoxEx( NULL, "Stopping the graph failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
// update the graph state view
UpdateGraphState( State_Stopped);
}
// release the MediaControl interface object
pMediaControl->Release();
pMediaControl= NULL;
return true;
}
2、删除Graph
bool
uEye_DirectShow_Demo_Dlg::FilterGraph_Destroy()
{
// proceed only if filter graph manager object present
if( m_pActiveFilterGraphManager == NULL)
{
return true;
}
if( !FilterGraph_Stop())
{
return false;
}
// disable 'dump graph' button as long as no graph present
m_bnDumpGraph.EnableWindow( FALSE);
// delete the capture filter
m_pActiveVideoSource->Release();
m_pActiveVideoSource= NULL;
// delete the graph
m_pActiveFilterGraphManager->Release();
m_pActiveFilterGraphManager= NULL;
// update the graph state view
UpdateGraphState( -1);
return true;
}
3、依据选择的设备的moniker来创建Graph
分为:
(1)为选择的设备创建capture filter
status= pMoniker->BindToObject( 0, 0, IID_IBaseFilter, (void**)&m_pActiveVideoSource);
(2) 创建一个capture Graph Builder对象
ICaptureGraphBuilder2* pCaptureGraphBuilder= NULL;
status= CoCreateInstance( CLSID_CaptureGraphBuilder2,
NULL,
CLSCTX_INPROC,
IID_ICaptureGraphBuilder2,
(void**)&pCaptureGraphBuilder);
(3) 创建 Filter Graph Manager
// create the Filter Graph Manager
status= CoCreateInstance( CLSID_FilterGraph,
NULL,
CLSCTX_INPROC,
IID_IGraphBuilder,
(void **)&m_pActiveFilterGraphManager);
(4) 初始化Capture Graph Builder 对象，把graph和builder 连接起来
status= pCaptureGraphBuilder->SetFiltergraph( m_pActiveFilterGraphManager);
(5) 添加Capture到graph中
status= m_pActiveFilterGraphManager->AddFilter( m_pActiveVideoSource, L"Video Capture");
(6) render 视频的capture pin， 把caputre filter和render连接起来
status= pCaptureGraphBuilder->RenderStream( &PIN_CATEGORY_CAPTURE,
&MEDIATYPE_Video,
m_pActiveVideoSource,
NULL,
NULL);
(7) 查询filter graph manager的VideoWindow接口
IVideoWindow* pVideoWindow= NULL;
status= m_pActiveFilterGraphManager->QueryInterface( IID_IVideoWindow, (void**)&pVideoWindow);
(8) 把video view连接到graph
// connect the dialogs video view to the graph
CWnd* pwnd= GetDlgItem( IDC_STATIC_VIDEOVIEW);
pVideoWindow->put_Owner( (OAHWND)pwnd->m_hWnd); // put_Owner always returns NOERROR
// we dont want a title bar on our video view
long pWindowStyle = 0;
pVideoWindow->get_WindowStyle(&pWindowStyle);
pWindowStyle &= ~WS_CAPTION;
pVideoWindow->put_WindowStyle(pWindowStyle);
// adjust graphs video geometry
CRect rc( 0, 0, 0, 0);
pwnd->GetClientRect( &rc);
pVideoWindow->SetWindowPosition( rc.left, rc.top, rc.Width(), rc.Height());
// release the VideoWindow interface object, we do not need it anymore
pVideoWindow->Release();
四、 開始播放
bool
uEye_DirectShow_Demo_Dlg::FilterGraph_Start()
{
// proceed only if filter graph manager object present
if( m_pActiveFilterGraphManager == NULL)
{
return true;
}
HRESULT status= S_OK;
// get the MediaControl interface of the graph
IMediaControl* pMediaControl= NULL;
status= m_pActiveFilterGraphManager->QueryInterface( IID_IMediaControl, (void**)&pMediaControl);
if( FAILED(status) || pMediaControl == NULL)
{
MessageBoxEx( NULL, "Querying MediaControl interface of the filter graph manager failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
//// check for graph to be stopped before allowing to start
//OAFilterState filterState= 0; // OAFilterState is actually a long
//status= pMediaControl->GetState( 100, &filterState);
//if( FAILED(status))
//{
// // cleanup
// // release the MediaControl interface object
// pMediaControl->Release();
// pMediaControl= NULL;
// MessageBoxEx( NULL, "Querying graph state failed!", __FUNCTION__, MB_ICONERROR, 0);
// return false;
//}
//if( filterState == State_Stopped)
{
// start the execution of the graph
status= pMediaControl->Run();
if( FAILED(status))
{
// cleanup
// release the MediaControl interface object
pMediaControl->Release();
pMediaControl= NULL;
MessageBoxEx( NULL, "Starting the graph failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
// update the graph state view
UpdateGraphState( State_Running);
}
// release the MediaControl interface object
pMediaControl->Release();
pMediaControl= NULL;
return true;
}
五、 pin 特征的查看
假设pin里有自己的查看特征接口, 那么就直接调用接口
bool
uEye_DirectShow_Demo_Dlg::ShowPinProperties()
{
// proceed only if video source object present
if( m_pActiveVideoSource == NULL)
{
return true;
}
HRESULT status= S_OK;
IPin* pPin= GetPin( m_pActiveVideoSource, PINDIR_OUTPUT, &MEDIATYPE_Video, &PIN_CATEGORY_CAPTURE);
if( pPin == NULL)
{
MessageBoxEx( NULL, "Pin not available!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
IUnknown* pFilterUnk= NULL;
status= pPin->QueryInterface( IID_IUnknown, (void**)&pFilterUnk);
if( FAILED(status))
{
// cleanup
pPin->Release();
pPin= NULL;
MessageBoxEx( NULL, "Querying pin's IAMStreamConfig interface failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
ISpecifyPropertyPages* pSpecifyPropertyPages= NULL;
status= pFilterUnk->QueryInterface( IID_ISpecifyPropertyPages, (void**)&pSpecifyPropertyPages);
if( FAILED(status))
{
// cleanup
pFilterUnk->Release();
pFilterUnk= NULL;
pPin->Release();
pPin= NULL;
MessageBoxEx( NULL, "Querying pin's ISpecifyPropertyPages interface failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
CAUUID cauuid= { 0, NULL};
status= pSpecifyPropertyPages->GetPages( &cauuid);
if( FAILED(status))
{
// cleanup
pSpecifyPropertyPages->Release();
pSpecifyPropertyPages->Release();
pSpecifyPropertyPages= NULL;
pFilterUnk->Release();
pFilterUnk= NULL;
pPin->Release();
pPin= NULL;
MessageBoxEx( NULL, "Querying pin's ISpecifyPropertyPages interface failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
pSpecifyPropertyPages->Release();
pSpecifyPropertyPages->Release();
pSpecifyPropertyPages= NULL;
status= OleCreatePropertyFrame( GetSafeHwnd(),//*this,
0,
0,
OLESTR("uEye Capture Device Pin"),
1,
(IUnknown**)&pFilterUnk,
cauuid.cElems,
(GUID*)cauuid.pElems,
0,
0,
NULL);
if( FAILED(status))
{
// cleanup
CoTaskMemFree( cauuid.pElems);
cauuid.pElems= NULL;
cauuid.cElems= 0;
pFilterUnk->Release();
pFilterUnk= NULL;
pPin->Release();
pPin= NULL;
MessageBoxEx( NULL, "OleCreatePropertyFrame failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
// cleanup
CoTaskMemFree( cauuid.pElems);
cauuid.pElems= NULL;
cauuid.cElems= 0;
pFilterUnk->Release();
pFilterUnk= NULL;
pPin->Release();
pPin= NULL;
return true;
}
六、 查询包括的 filter信息
bool
uEye_DirectShow_Demo_Dlg::EnumerateFilters()
{
// proceed only if filter graph builder object present
if( m_pActiveFilterGraphManager == NULL)
{
return false;
}
IEnumFilters *pEnum = NULL;
IBaseFilter *pFilter;
ULONG cFetched;
HRESULT hr = m_pActiveFilterGraphManager->EnumFilters(&pEnum);
if (FAILED(hr))
{
MessageBoxEx( NULL, "Enumerating filters failed!", __FUNCTION__, MB_ICONERROR, 0);
return false;
}
CString sInfo( "Filters in the Graph:
");
int i= 0;
while(pEnum->Next(1, &pFilter, &cFetched) == S_OK)
{
i++;
FILTER_INFO FilterInfo;
hr = pFilter->QueryFilterInfo(&FilterInfo);
if (FAILED(hr))
{
MessageBoxEx( NULL, "Could not get the filter info", __FUNCTION__, MB_ICONERROR, 0);
continue; // Maybe the next one will work.
}
LPWSTR pVendorInfo= NULL;
hr= pFilter->QueryVendorInfo( &pVendorInfo);
if( FAILED(hr))
{
pVendorInfo= NULL;
}
if( pVendorInfo != NULL)
{
sInfo.AppendFormat( "%d: %S (by %S)
", i, FilterInfo.achName, pVendorInfo);
CoTaskMemFree( pVendorInfo);
pVendorInfo= NULL;
}
else
{
sInfo.AppendFormat( "%d: %S
", i, FilterInfo.achName);
}
// The FILTER_INFO structure holds a pointer to the Filter Graph
// Manager, with a reference count that must be released.
if (FilterInfo.pGraph != NULL)
{
FilterInfo.pGraph->Release();
}
pFilter->Release();
}
pEnum->Release();
MessageBoxEx( NULL, sInfo.GetBuffer(), __FUNCTION__, MB_OK, 0);
return true;
}
