使用Directshow控制USB摄像头

//------------------------------------------------------------------- // CCaptureVideo视频捕捉类实现文件CaptureVideo.cpp //------------------------------------------------------------------- // CaptureVideo.cpp: implementation of the CCaptureVideo class. // ///////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "CaptureVideo.h" #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif BOOL bOneShot=FALSE;//全局变量 TCHAR szFileName[MAX_PATH];// 位图文件名称 class CSampleGrabberCB : public ISampleGrabberCB { public: long lWidth; long lHeight; TCHAR m_szFileName[MAX_PATH];// 位图文件名称 CSampleGrabberCB( ) { } STDMETHODIMP_(ULONG) AddRef() { return 2; } STDMETHODIMP_(ULONG) Release() { return 1; } STDMETHODIMP QueryInterface(REFIID riid, void ** ppv) { if( riid == IID_ISampleGrabberCB || riid == IID_IUnknown ) { *ppv = (void *) static_cast<ISampleGrabberCB*> ( this ); return NOERROR; } return E_NOINTERFACE; } STDMETHODIMP SampleCB( double SampleTime, IMediaSample * pSample ) { return 0; } STDMETHODIMP BufferCB( double dblSampleTime, BYTE * pBuffer, long lBufferSize ) { if( !bOneShot )return 0; if (!pBuffer)return E_POINTER; strcpy(m_szFileName, szFileName); SaveBitmap(pBuffer, lBufferSize); bOneShot = FALSE; return 0; } //创建位图文件 BOOL SaveBitmap(BYTE * pBuffer, long lBufferSize ) { HANDLE hf = CreateFile( m_szFileName, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, NULL, NULL ); if( hf == INVALID_HANDLE_VALUE )return 0; // 写文件头 BITMAPFILEHEADER bfh; memset( &bfh, 0, sizeof( bfh ) ); bfh.bfType ='MB'; bfh.bfSize = sizeof( bfh ) + lBufferSize + sizeof( BITMAPINFOHEADER ); bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER ); DWORD dwWritten = 0; WriteFile( hf, &bfh, sizeof( bfh ), &dwWritten, NULL ); // 写位图格式 BITMAPINFOHEADER bih; memset( &bih, 0, sizeof( bih ) ); bih.biSize = sizeof( bih ); bih.biWidth = lWidth; bih.biHeight = lHeight; bih.biPlanes = 1; bih.biBitCount = 24; WriteFile( hf, &bih, sizeof( bih ), &dwWritten, NULL ); // 写位图数据 WriteFile( hf, pBuffer, lBufferSize, &dwWritten, NULL ); CloseHandle( hf ); return 0; } }; CSampleGrabberCB mCB; ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// CCaptureVideo::CCaptureVideo() { //COM Library Intialization if(FAILED(CoInitialize(NULL))) /*, COINIT_APARTMENTTHREADED)))*/ { AfxMessageBox("CoInitialize Failed!\r\n"); return; } m_hWnd = NULL; m_pVW = NULL; m_pMC = NULL; m_pGB = NULL; m_pCapture = NULL; } CCaptureVideo::~CCaptureVideo() { // Stop media playback if(m_pMC)m_pMC->Stop(); if(m_pVW) { m_pVW->put_Visible(OAFALSE); m_pVW->put_Owner(NULL); } srelease(m_pCapture); srelease(m_pMC); srelease(m_pGB); srelease(m_pBF); CoUninitialize( ); } int CCaptureVideo::EnumDevices(HWND hList) { if (!hList) return -1; int id = 0; //枚举视频扑捉设备 ICreateDevEnum *pCreateDevEnum; HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,IID_ICreateDevEnum, (void**)&pCreateDevEnum); if (hr != NOERROR)return -1; CComPtr<IEnumMoniker> pEm; hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pEm, 0); if (hr != NOERROR)return -1; pEm->Reset(); ULONG cFetched; IMoniker *pM; while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK) { 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) { TCHAR str[2048]; id++; WideCharToMultiByte(CP_ACP,0,var.bstrVal, -1, str, 2048, NULL, NULL); ::SendMessage(hList, CB_ADDSTRING, 0,(LPARAM)str); SysFreeString(var.bstrVal); } pBag->Release(); } pM->Release(); } return id; } HRESULT CCaptureVideo::Init(int iDeviceID, HWND hWnd) { HRESULT hr; hr = InitCaptureGraphBuilder(); if (FAILED(hr)) { AfxMessageBox("Failed to get video interfaces!"); return hr; } // Bind Device Filter. We know the device because the id was passed in if(!BindFilter(iDeviceID, &m_pBF))return S_FALSE; hr = m_pGB->AddFilter(m_pBF, L"Capture Filter"); // hr = m_pCapture->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, // m_pBF, NULL, NULL); // create a sample grabber hr = m_pGrabber.CoCreateInstance( CLSID_SampleGrabber ); if( !m_pGrabber ) { AfxMessageBox("Fail to create SampleGrabber, maybe qedit.dll is not registered?"); return hr; } CComQIPtr< IBaseFilter, &IID_IBaseFilter > pGrabBase( m_pGrabber ); //设置视频格式 AM_MEDIA_TYPE mt; ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE)); mt.majortype = MEDIATYPE_Video; mt.subtype = MEDIASUBTYPE_RGB24; hr = m_pGrabber->SetMediaType(&mt); if( FAILED( hr ) ) { AfxMessageBox("Fail to set media type!"); return hr; } hr = m_pGB->AddFilter( pGrabBase, L"Grabber" ); if( FAILED( hr ) ) { AfxMessageBox("Fail to put sample grabber in graph"); return hr; } // try to render preview/capture pin hr = m_pCapture->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,m_pBF,pGrabBase,NULL); if( FAILED( hr ) ) hr = m_pCapture->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,m_pBF,pGrabBase,NULL); if( FAILED( hr ) ) { AfxMessageBox("Can’t build the graph"); return hr; } hr = m_pGrabber->GetConnectedMediaType( &mt ); if ( FAILED( hr) ) { AfxMessageBox("Failt to read the connected media type"); return hr; } VIDEOINFOHEADER * vih = (VIDEOINFOHEADER*) mt.pbFormat; mCB.lWidth = vih->bmiHeader.biWidth; mCB.lHeight = vih->bmiHeader.biHeight; FreeMediaType(mt); hr = m_pGrabber->SetBufferSamples( FALSE ); hr = m_pGrabber->SetOneShot( FALSE ); hr = m_pGrabber->SetCallback( &mCB, 1 ); //设置视频捕捉窗口 m_hWnd = hWnd ; SetupVideoWindow(); hr = m_pMC->Run();//开始视频捕捉 if(FAILED(hr)) { AfxMessageBox("Couldn’t run the graph!"); return hr; } return S_OK; } bool CCaptureVideo::BindFilter(int deviceId, IBaseFilter **pFilter) { if (deviceId < 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 <= deviceId) { 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 == deviceId) { pM->BindToObject(0, 0, IID_IBaseFilter, (void**)pFilter); } SysFreeString(var.bstrVal); } pBag->Release(); } pM->Release(); index++; } return true; } HRESULT CCaptureVideo::InitCaptureGraphBuilder() { HRESULT hr; // 创建IGraphBuilder接口 hr=CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&m_pGB); // 创建ICaptureGraphBuilder2接口 hr = CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC, IID_ICaptureGraphBuilder2, (void **) &m_pCapture); if (FAILED(hr))return hr; m_pCapture->SetFiltergraph(m_pGB); hr = m_pGB->QueryInterface(IID_IMediaControl, (void **)&m_pMC); if (FAILED(hr))return hr;