QT+vs+directshow获取摄像头名称及其支持的分辨率

#include "stdafx.h" #include "testdirectshow.h" TestDirectShow::TestDirectShow(QWidget *parent) : QMainWindow(parent) { ui.setupUi(this); char sName[256] = { 0 }; //GetAVDeviceByQt(); for (int i = 0;; i++) { if (GetVideoDeviceName(i, sName, 256)) { ui.comboBoxVideo->addItem(sName); } else { break; } } for (std::map<int ,StuCameraInfo>::iterator it = m_mapCameraInfo.begin(); it != m_mapCameraInfo.end(); it++) { if (it->second.listResolution.size() > 1) { it->second.listResolution.sort(); } } ui.comboBoxVideo->setCurrentIndex(-1); for (int i = 0;; i++) { if (GetAudioDeviceName(i, sName, 256)) { ui.comboBoxAudio->addItem(QString::fromLocal8Bit(sName)); } else { break; } } } TestDirectShow::~TestDirectShow() { } void TestDirectShow::on_pushButtonPreview_clicked() { } void TestDirectShow::on_pushButtonCapture_clicked() { } void TestDirectShow::on_pushButtonRecord_clicked() { } void TestDirectShow::GetAVDeviceByQt() { QList<QCameraInfo> listVideo = QCameraInfo::availableCameras(); foreach(QCameraInfo camera, listVideo) { ui.comboBoxVideo->addItem(camera.description()); } QList<QAudioDeviceInfo> listAudio = QAudioDeviceInfo::availableDevices(QAudio::AudioInput); foreach(QAudioDeviceInfo audio, listAudio) { ui.comboBoxAudio->addItem(audio.deviceName()); } } bool TestDirectShow::GetVideoDeviceName(int nCamId, char* sName, int nBufferSize) { int count = 0; bool bRet = false; ::CoInitialize(NULL); ICreateDevEnum* pCreateDevEnum;//enumrate all video capture devices HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void**)&pCreateDevEnum); IEnumMoniker* pEm; hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0); if (hr != NOERROR) { ::CoUninitialize(); return bRet; } pEm->Reset(); ULONG cFetched; IMoniker *pM; while (hr = pEm->Next(1, &pM, &cFetched), hr == S_OK) { if (count == nCamId) { IPropertyBag* pBag = NULL; 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);//还有其他属性，像描述信息等等 if (hr == NOERROR) { //获取设备名称 WideCharToMultiByte(CP_ACP, 0, var.bstrVal, -1, sName, nBufferSize, "", NULL); StuCameraInfo cameraInfo; cameraInfo.id = nCamId; cameraInfo.name = QString::fromLocal8Bit(sName); m_mapCameraInfo[cameraInfo.id] = cameraInfo; bRet = true; GetResolution(nCamId, pM); SysFreeString(var.bstrVal); } pBag->Release(); } pM->Release(); break; } count++; } pCreateDevEnum = NULL; pEm = NULL; ::CoUninitialize(); return bRet; } bool TestDirectShow::GetAudioDeviceName(int nCamId, char* sName, int nBufferSize) { int count = 0; bool bRet = false; ::CoInitialize(NULL); ICreateDevEnum* pCreateDevEnum;//enumrate all video capture devices HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void**)&pCreateDevEnum); IEnumMoniker* pEm; hr = pCreateDevEnum->CreateClassEnumerator(CLSID_AudioInputDeviceCategory, &pEm, 0); if (hr != NOERROR) { ::CoUninitialize(); return bRet; } pEm->Reset(); ULONG cFetched; IMoniker *pM; while (hr = pEm->Next(1, &pM, &cFetched), hr == S_OK) { if (count == nCamId) { IPropertyBag* pBag = NULL; 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);//还有其他属性，像描述信息等等 if (hr == NOERROR) { //获取设备名称 WideCharToMultiByte(CP_ACP, 0, var.bstrVal, -1, sName, nBufferSize, "", NULL); SysFreeString(var.bstrVal); } pBag->Release(); } pM->Release(); bRet = true; break; } count++; } pCreateDevEnum = NULL; pEm = NULL; ::CoUninitialize(); return bRet; } void TestDirectShow::GetResolution(int cameraId, IMoniker* pMoniker) { USES_CONVERSION; HRESULT hr = NULL; IBaseFilter *pFilter; hr = pMoniker->BindToObject(NULL, NULL, IID_IBaseFilter, (void**)&pFilter); if (!pFilter) { return ; } IEnumPins * pinEnum = NULL; IPin * pin = NULL; if (FAILED(pFilter->EnumPins(&pinEnum))) { pinEnum->Release(); return ; } pinEnum->Reset(); ULONG pinFetched = 0; while (SUCCEEDED(pinEnum->Next(1, &pin, &pinFetched)) && pinFetched) { if (!pin) { continue; } PIN_INFO pinInfo; if (FAILED(pin->QueryPinInfo(&pinInfo))) { continue; } if (pinInfo.dir != PINDIR_OUTPUT) { continue; } IEnumMediaTypes *mtEnum = NULL; AM_MEDIA_TYPE *mt = NULL; if (FAILED(pin->EnumMediaTypes(&mtEnum))) { break; } mtEnum->Reset(); ULONG mtFetched = 0; while (SUCCEEDED(mtEnum->Next(1, &mt, &mtFetched)) && mtFetched) { BITMAPINFOHEADER* bmi = NULL; int avgTime; if (mt->formattype == FORMAT_VideoInfo) { if (mt->cbFormat >= sizeof(VIDEOINFOHEADER)) { VIDEOINFOHEADER *pVih = reinterpret_cast<VIDEOINFOHEADER*>(mt->pbFormat); bmi = &(pVih->bmiHeader); avgTime = pVih->AvgTimePerFrame; } } else if (mt->formattype == FORMAT_VideoInfo2) { if (mt->cbFormat >= sizeof(VIDEOINFOHEADER2)) { VIDEOINFOHEADER2* pVih = reinterpret_cast<VIDEOINFOHEADER2*>(mt->pbFormat); bmi = &(pVih->bmiHeader); avgTime = pVih->AvgTimePerFrame; } } if (bmi) { if (m_mapCameraInfo.find(cameraId) != m_mapCameraInfo.end()) { bool bAdd = true; StuResolution stuResolution; stuResolution.width = bmi->biWidth; stuResolution.height = bmi->biHeight; for (std::list<StuResolution>::iterator it = m_mapCameraInfo[cameraId].listResolution.begin(); it != m_mapCameraInfo[cameraId].listResolution.end(); it++) { if (it->width == stuResolution.width && it->height == stuResolution.height) { bAdd = false; break; }