基于VC、DirectShow和OpenCV的摄像头捕捉视频的例子

////////////////////////////////////////////////////////////////////// // Video Capture using DirectShow // Author: Shiqi Yu (shiqi.yu@gmail.com) // Thanks to: // HardyAI@OpenCV China // flymanbox@OpenCV China (for his contribution to function CameraName, and frame width/height setting) // Last modification: April 9, 2009 ////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////// // 使用说明： // 1. 将CameraDS.h CameraDS.cpp以及目录DirectShow复制到你的项目中 // 2. 菜单 Project->Settings->Settings for:(All configurations)->C/C++->Category(Preprocessor)->Additional include directories // 设置为 DirectShow/Include // 3. 菜单 Project->Settings->Settings for:(All configurations)->Link->Category(Input)->Additional library directories // 设置为 DirectShow/Lib ////////////////////////////////////////////////////////////////////// // CameraDS.cpp: implementation of the CCameraDS class. // ////////////////////////////////////////////////////////////////////// #include "CameraDS.h" #pragma comment(lib,"Strmiids.lib") ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// CCameraDS::CCameraDS() { m_bConnected = false; m_nWidth = 0; m_nHeight = 0; m_bLock = false; m_bChanged = false; m_pFrame = NULL; m_nBufferSize = 0; m_pNullFilter = NULL; m_pMediaEvent = NULL; m_pSampleGrabberFilter = NULL; m_pGraph = NULL; CoInitialize(NULL); } CCameraDS::~CCameraDS() { CloseCamera(); CoUninitialize(); } void CCameraDS::CloseCamera() { if(m_bConnected) m_pMediaControl->Stop(); m_pGraph = NULL; m_pDeviceFilter = NULL; m_pMediaControl = NULL; m_pSampleGrabberFilter = NULL; m_pSampleGrabber = NULL; m_pGrabberInput = NULL; m_pGrabberOutput = NULL; m_pCameraOutput = NULL; m_pMediaEvent = NULL; m_pNullFilter = NULL; m_pNullInputPin = NULL; if (m_pFrame) cvReleaseImage(&m_pFrame); m_bConnected = false; m_nWidth = 0; m_nHeight = 0; m_bLock = false; m_bChanged = false; m_nBufferSize = 0; } bool CCameraDS::OpenCamera(int nCamID, bool bDisplayProperties, int nWidth, int nHeight) { HRESULT hr = S_OK; CoInitialize(NULL); // Create the Filter Graph Manager. hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, IID_IGraphBuilder, (void **)&m_pGraph); hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (LPVOID *)&m_pSampleGrabberFilter); hr = m_pGraph->QueryInterface(IID_IMediaControl, (void **) &m_pMediaControl); hr = m_pGraph->QueryInterface(IID_IMediaEvent, (void **) &m_pMediaEvent); hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (LPVOID*) &m_pNullFilter); hr = m_pGraph->AddFilter(m_pNullFilter, L"NullRenderer"); hr = m_pSampleGrabberFilter->QueryInterface(IID_ISampleGrabber, (void**)&m_pSampleGrabber); AM_MEDIA_TYPE mt; ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE)); mt.majortype = MEDIATYPE_Video; mt.subtype = MEDIASUBTYPE_RGB24; mt.formattype = FORMAT_VideoInfo; hr = m_pSampleGrabber->SetMediaType(&mt); MYFREEMEDIATYPE(mt); m_pGraph->AddFilter(m_pSampleGrabberFilter, L"Grabber"); // Bind Device Filter. We know the device because the id was passed in BindFilter(nCamID, &m_pDeviceFilter); m_pGraph->AddFilter(m_pDeviceFilter, NULL); CComPtr<IEnumPins> pEnum; m_pDeviceFilter->EnumPins(&pEnum); hr = pEnum->Reset(); hr = pEnum->Next(1, &m_pCameraOutput, NULL); pEnum = NULL; m_pSampleGrabberFilter->EnumPins(&pEnum); pEnum->Reset(); hr = pEnum->Next(1, &m_pGrabberInput, NULL); pEnum = NULL; m_pSampleGrabberFilter->EnumPins(&pEnum); pEnum->Reset(); pEnum->Skip(1); hr = pEnum->Next(1, &m_pGrabberOutput, NULL); pEnum = NULL; m_pNullFilter->EnumPins(&pEnum); pEnum->Reset(); hr = pEnum->Next(1, &m_pNullInputPin, NULL); //SetCrossBar(); if (bDisplayProperties) { CComPtr<ISpecifyPropertyPages> pPages; HRESULT hr = m_pCameraOutput->QueryInterface(IID_ISpecifyPropertyPages, (void**)&pPages); if (SUCCEEDED(hr)) { PIN_INFO PinInfo; m_pCameraOutput->QueryPinInfo(&PinInfo); CAUUID caGUID; pPages->GetPages(&caGUID); OleCreatePropertyFrame(NULL, 0, 0, L"Property Sheet", 1, (IUnknown **)&(m_pCameraOutput.p), caGUID.cElems, caGUID.pElems, 0, 0, NULL); CoTaskMemFree(caGUID.pElems); PinInfo.pFilter->Release(); } pPages = NULL; } else { ////////////////////////////////////////////////////////////////////////////// // 加入由 lWidth和lHeight设置的摄像头的宽和高 的功能，默认320*240 // by flymanbox @2009-01-24 ////////////////////////////////////////////////////////////////////////////// int _Width = nWidth, _Height = nHeight; IAMStreamConfig* iconfig; iconfig = NULL; hr = m_pCameraOutput->QueryInterface(IID_IAMStreamConfig, (void**)&iconfig); AM_MEDIA_TYPE* pmt; if(iconfig->GetFormat(&pmt) !=S_OK) { //printf("GetFormat Failed ! \n"); return false; } VIDEOINFOHEADER* phead; if ( pmt->formattype == FORMAT_VideoInfo) { phead=( VIDEOINFOHEADER*)pmt->pbFormat; phead->bmiHeader.biWidth = _Width; phead->bmiHeader.biHeight = _Height; if(( hr=iconfig->SetFormat(pmt)) != S_OK ) { return false; } } iconfig->Release(); iconfig=NULL; MYFREEMEDIATYPE(*pmt); } hr = m_pGraph->Connect(m_pCameraOutput, m_pGrabberInput); hr = m_pGraph->Connect(m_pGrabberOutput, m_pNullInputPin); if (FAILED(hr)) { switch(hr) { case VFW_S_NOPREVIEWPIN : break; case E_FAIL : break; case E_INVALIDARG : break; case E_POINTER : break; } } m_pSampleGrabber->SetBufferSamples(TRUE); m_pSampleGrabber->SetOneShot(TRUE); hr = m_pSampleGrabber->GetConnectedMediaType(&mt); if(FAILED(hr)) return false; VIDEOINFOHEADER *videoHeader; videoHeader = reinterpret_cast<VIDEOINFOHEADER*>(mt.pbFormat); m_nWidth = videoHeader->bmiHeader.biWidth; m_nHeight = videoHeader->bmiHeader.biHeight; m_bConnected = true; pEnum = NULL; return true; } bool CCameraDS::BindFilter(int nCamID, IBaseFilter **pFilter) { if (nCamID < 0) return false; // enumerate all video capture devices CComPtr<ICreateDevEnum> pCreateDevEnum; HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void**)&pCreateDevEnum); if (hr != NOERROR) { return false; } CComPtr<IEnumMoniker> pEm; hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0); if (hr != NOERROR) { return false; } pEm->Reset(); ULONG cFetched; IMoniker *pM; int index = 0; while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK, index <= nCamID) { IPropertyBag *pBag; hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag); if(SUCCEEDED(hr)) { VARIANT var; var.vt = VT_BSTR; hr = pBag->Read(L"FriendlyName", &var, NULL); if (hr == NOERROR) { if (index == nCamID) { pM->BindToObject(0, 0, IID_IBaseFilter, (void**)pFilter); } SysFreeString(var.bstrVal); } pBag->Release(); } pM->Release(); index++; } pCreateDevEnum = NULL; return true; } //将输入crossbar变成PhysConn_Video_Composite void CCameraDS::SetCrossBar() { int i; IAMCrossbar *pXBar1 = NULL; ICaptureGraphBuilder2 *pBuilder = NULL; HRESULT hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void **)