阿里云备案网站备案,个人门户网站建设流程,用dw制作学校网站教程,给个网站你知道一、前言 本章主要讲述#xff0c;如何获取设备名称以及guid#xff0c;采集设备的采集格式识别#xff0c;设备的插拔 设备列表以及属性的获取使用的directshow(后续的MediaFoundation无法获取OBS摄像头) 设备的插拔使用的是QT 捕获系统消息#xff0c;捕获到设备插拔后如何获取设备名称以及guid采集设备的采集格式识别设备的插拔 设备列表以及属性的获取使用的directshow(后续的MediaFoundation无法获取OBS摄像头) 设备的插拔使用的是QT 捕获系统消息捕获到设备插拔后重新获取下设备列表(这里并没有动态的添加或者删除考虑的主要是维护UI显示时 设备顺序的一致性)
二、设备列表的获取 ICreateDevEnum 接口创建特定的类如视频捕获设备音频捕获设备视频压缩等的一个枚举器 可以使用CLSID_SystemDeviceEnum来得到该指针。
CreateDevEnum::CreateClassEnumerator(
REFCLSID clsidDeviceClass, //设备类别
IEnumMoniker **ppEnumMoniker, //输出参数IEnumMoniker ××
DWORD dwFlags
); IEnumMoniker 接口, 表示特定的设备枚举类 IMoniker::Enum 方法获取指向 IEnumMoniker 实现的指针该实现可以通过名字对象的组件向前或向后枚举。 IRunningObjectTable::EnumRunning 方法返回一个指向 IEnumMoniker 实现的指针该实现可以枚举在运行对象表中注册的名字对象。 IEnumMoniker::Next 此方法检索枚举序列中下一个设备是否存在
struct CameraDevice
{int nIndex; // indexstd::string uid; // 硬件层uniqueId mac中为BuiltInMicrophoneDevice std::string name; // 设备名称
};std::mapstd::string, CameraDevice VideoCoreDevice::getVideoDeviceList()
{if(!m_pDevEnum){::CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC, IID_ICreateDevEnum, (void**)m_pDevEnum);}std::mapstd::string, CameraDevice devices;if (!m_bCoUninitializeIsRequired){goto END;}HRESULT hr m_pDevEnum-CreateClassEnumerator(CLSID_VideoInputDeviceCategory, m_pMonikerDevEnum, 0);if (hr ! NOERROR){std::cout CreateClassEnumerator failed std::endl;goto END;}m_pMonikerDevEnum-Reset();ULONG cFetched;IMoniker* pM;int index 0;while (S_OK m_pMonikerDevEnum-Next(1, pM, cFetched)) {IPropertyBag* pBag;hr pM-BindToStorage(0, 0, IID_IPropertyBag, (void**)pBag);if (S_OK hr) {// Find the description or friendly name.VARIANT varName;VariantInit(varName);hr pBag-Read(LDescription, varName, 0);if (FAILED(hr)) {hr pBag-Read(LFriendlyName, varName, 0);}if (SUCCEEDED(hr)) {// ignore all VFW driversif ((wcsstr(varName.bstrVal, (L(VFW))) NULL) (_wcsnicmp(varName.bstrVal, (LGoogle Camera Adapter), 21) ! 0)) {// Found a valid device.{char device_name[256] { 0 };char unique_name[256] { 0 };char product_name[256] { 0 };int convResult WideCharToMultiByte(CP_UTF8, 0, varName.bstrVal, -1, (char*)device_name, sizeof(device_name), NULL, NULL);if (convResult 0){std::cout WideCharToMultiByte failed std::endl;goto END;}hr pBag-Read(LDevicePath, varName, 0);if (FAILED(hr)){strncpy_s((char*)unique_name, sizeof(unique_name),(char*)device_name, convResult);}else{convResult WideCharToMultiByte(CP_UTF8, 0, varName.bstrVal, -1, (char*)unique_name, sizeof(unique_name), NULL, NULL);if (convResult 0){std::cout WideCharToMultiByte failed std::endl;goto END;}}GetProductId(unique_name, product_name, sizeof(product_name));CameraDevice camera;camera.nIndex index;camera.name device_name;camera.uid unique_name;devices.insert(std::make_pair(camera.uid, camera));}index; // increase the number of valid devices}}VariantClear(varName);pBag-Release();pM-Release();}}END:return devices;
}// 不同获取方式得到的ID不一致通过处理得到相同的ID
void GetProductId(const char* devicePath, char* productUniqueIdUTF8, uint32_t productUniqueIdUTF8Length)
{*productUniqueIdUTF8 \0;char* startPos strstr((char*)devicePath, \\\\?\\);if (!startPos) {strncpy_s((char*)productUniqueIdUTF8, productUniqueIdUTF8Length, , 1);std::cout Failed to get the product Id std::endl;return;}startPos 4;char* pos strchr(startPos, );if (!pos || pos (char*)devicePath strlen((char*)devicePath)) {strncpy_s((char*)productUniqueIdUTF8, productUniqueIdUTF8Length, , 1);std::cout Failed to get the product Id std::endl;return;}// Find the second occurrence.pos strchr(pos 1, );uint32_t bytesToCopy (uint32_t)(pos - startPos);if (pos (bytesToCopy productUniqueIdUTF8Length) bytesToCopy kVideoCaptureProductIdLength) {strncpy_s((char*)productUniqueIdUTF8, productUniqueIdUTF8Length,(char*)startPos, bytesToCopy);}else{strncpy_s((char*)productUniqueIdUTF8, productUniqueIdUTF8Length, , 1);std::cout Failed to get the product Id std::endl;}
}三、设备的插拔检测 目前使用的是Qt::nativeEventFilter 过滤设备插拔信息,然后去响应设备列表
// 头文件
#pragma once
#include QWidget
#include QUuid
#include QAbstractNativeEventFilter
#include Windows.h
#include QHashclass VideoNotificationClient : public QAbstractNativeEventFilter, public QWidget
{
public:class Listener{public:virtual void onDeviceAdded(const std::string uid) 0;virtual void onDeviceRemoved(const std::string uid) 0;};public:void initialized();void uninstallFilter();bool nativeEventFilter(const QByteArray eventType, void* message, long* result) override;public:VideoNotificationClient(VideoNotificationClient::Listener* listener);~VideoNotificationClient();private:bool m_bInitialized;QHashQUuid, HDEVNOTIFY m_hSevNotifys;VideoNotificationClient::Listener* m_pListener;
};
//源文件
#include VideoNotificationClient.h
#include QDebug
#include iostream
#include Windows.h
#include Dbt.h
#include devguid.h
//具体的设备guid如usbiodef需要initguid
#include initguid.h
//USB设备
//GUID_DEVINTERFACE_USB_DEVICE
#include usbiodef.h
//HID人机交互设备-鼠标键盘等
#include hidclass.h
//GUID_DEVINTERFACE_KEYBOARD
#include ntddkbd.h
//GUID_DEVINTERFACE_MOUSE
#include ntddmou.h
#include QCoreApplication
#pragma comment(lib, user32.lib)
#pragma comment(lib, setupapi.lib)static const GUID GUID_DEVINTERFACE_LIST[]
{// GUID_DEVINTERFACE_CAMERA_DEVICE { 0x65E8773D, 0x8F56, 0x11D0, { 0xA3, 0xB9, 0x00, 0xA0, 0xC9, 0x22, 0x31, 0x96 } },// GUID_DEVINTERFACE_USB_DEVICE { 0xA5DCBF10, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } },// GUID_DEVINTERFACE_DISK { 0x53f56307, 0xb6bf, 0x11d0, { 0x94, 0xf2, 0x00, 0xa0, 0xc9, 0x1e, 0xfb, 0x8b } },// GUID_DEVINTERFACE_HID, { 0x4D1E55B2, 0xF16F, 0x11CF, { 0x88, 0xCB, 0x00, 0x11, 0x11, 0x00, 0x00, 0x30 } },// GUID_NDIS_LAN_CLASS { 0xad498944, 0x762f, 0x11d0, { 0x8d, 0xcb, 0x00, 0xc0, 0x4f, 0xc3, 0x35, 0x8c } },// GUID_DEVINTERFACE_COMPORT{ 0x86e0d1e0, 0x8089, 0x11d0, { 0x9c, 0xe4, 0x08, 0x00, 0x3e, 0x30, 0x1f, 0x73 } },// GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR{ 0x4D36E978, 0xE325, 0x11CE, { 0xBF, 0xC1, 0x08, 0x00, 0x2B, 0xE1, 0x03, 0x18 } },// GUID_DEVINTERFACE_PARALLEL{ 0x97F76EF0, 0xF883, 0x11D0, { 0xAF, 0x1F, 0x00, 0x00, 0xF8, 0x00, 0x84, 0x5C } },// GUID_DEVINTERFACE_PARCLASS{ 0x811FC6A5, 0xF728, 0x11D0, { 0xA5, 0x37, 0x00, 0x00, 0xF8, 0x75, 0x3E, 0xD1 } }
};VideoNotificationClient::VideoNotificationClient(VideoNotificationClient::Listener *listener): QWidget(nullptr), m_bInitialized(false), m_pListener(listener)
{this-hide();qApp-installNativeEventFilter(this);
}VideoNotificationClient::~VideoNotificationClient()
{uninstallFilter();qApp-removeNativeEventFilter(this);
} void VideoNotificationClient::initialized()
{HANDLE winid (HANDLE)this-winId();if (!winid){return;}//注册插拔事件HDEVNOTIFY hDevNotify;DEV_BROADCAST_DEVICEINTERFACE NotifacationFiler;ZeroMemory(NotifacationFiler, sizeof(DEV_BROADCAST_DEVICEINTERFACE));NotifacationFiler.dbcc_size sizeof(DEV_BROADCAST_DEVICEINTERFACE);NotifacationFiler.dbcc_devicetype DBT_DEVTYP_DEVICEINTERFACE;for (int i 0; i sizeof(GUID_DEVINTERFACE_LIST) / sizeof(GUID); i){NotifacationFiler.dbcc_classguid GUID_DEVINTERFACE_LIST[i];hDevNotify RegisterDeviceNotification(winid, NotifacationFiler, DEVICE_NOTIFY_WINDOW_HANDLE);if (!hDevNotify){qDebug() 注册失败 endl;m_bInitialized false;return;}m_hSevNotifys.insert(QUuid(NotifacationFiler.dbcc_classguid), hDevNotify);}m_bInitialized true;}void VideoNotificationClient::uninstallFilter()
{for (HDEVNOTIFY handle : qAsConst(m_hSevNotifys)){::UnregisterDeviceNotification(handle);}m_hSevNotifys.clear();
}bool VideoNotificationClient::nativeEventFilter(const QByteArray eventType, void* message, long* result)
{Q_UNUSED(result);MSG* msg reinterpret_castMSG*(message);int msgType msg-message;if (msgType WM_DEVICECHANGE){PDEV_BROADCAST_HDR lpdb (PDEV_BROADCAST_HDR)msg-lParam;switch (msg-wParam) {case DBT_DEVICEARRIVAL:if (lpdb-dbch_devicetype DBT_DEVTYP_DEVICEINTERFACE){PDEV_BROADCAST_DEVICEINTERFACE pDevInf (PDEV_BROADCAST_DEVICEINTERFACE)lpdb;GUID cameraGuid { 0x65E8773D, 0x8F56, 0x11D0, { 0xA3, 0xB9, 0x00, 0xA0, 0xC9, 0x22, 0x31, 0x96 } };if (cameraGuid pDevInf-dbcc_classguid){QString devicePath QString::fromWCharArray(pDevInf-dbcc_name);QStringList parts devicePath.split(#);if (parts.length() ! 4){qDebug() camera logic error;return false;}QString usbPortStr parts[2];QStringList usbPortParts usbPortStr.split();if (usbPortParts.length() ! 4){qDebug() camera logic error;return false;} if (0000 ! usbPortParts[3]){return false;}devicePath devicePath.toLower();m_pListener-onDeviceAdded(devicePath.toStdString());//emit cameraPlugged(true, devicePath);}}break;case DBT_DEVICEREMOVECOMPLETE:if (lpdb-dbch_devicetype DBT_DEVTYP_DEVICEINTERFACE){PDEV_BROADCAST_DEVICEINTERFACE pDevInf (PDEV_BROADCAST_DEVICEINTERFACE)lpdb;GUID cameraGuid { 0x65E8773D, 0x8F56, 0x11D0, { 0xA3, 0xB9, 0x00, 0xA0, 0xC9, 0x22, 0x31, 0x96 } };if (cameraGuid pDevInf-dbcc_classguid){// USB拔出马上触发QString devicePath QString::fromWCharArray(pDevInf-dbcc_name);QStringList parts devicePath.split(#);if (parts.length() ! 4){qDebug() camera logic error;return false;}QString usbPortStr parts[2];QStringList usbPortParts usbPortStr.split();if (usbPortParts.length() ! 4){qDebug() camera logic error;return false;}if (0000 ! usbPortParts[3]){return false;}devicePath devicePath.toLower();m_pListener-onDeviceRemoved(devicePath.toStdString());}}break;}}return false;
}四、设备插拔库设计
项目完整代码在后续的文章中给出 // camra
struct CameraDevice
{int nIndex 0; // indexstd::string uid ; // 硬件层uniqueId mac中为BuiltInMicrophoneDevice std::string name ; // 设备名称
};// IVideoCore
class VIDEODEVICE_SHARED_EXPORT IVideoCore
{
public:static IVideoCore* getInstance();virtual void addListener(IVideoDeviceListner* listner) 0;virtual void removeListener(IVideoDeviceListner* listner) 0;virtual std::mapstd::string, CameraDevice getVideoDevicesList() 0;
};// IVideoDevice
class VIDEODEVICE_SHARED_EXPORT IVideoDevice
{
public:virtual bool initlized() 0;virtual std::mapstd::string, CameraDevice getVideoDevicesList() 0;virtual void addListener(IVideoDeviceListner* listener) 0;virtual void removeListener(IVideoDeviceListner* listener) 0;};// IVideoDeviceListner
class VIDEODEVICE_SHARED_EXPORT IVideoDeviceListner
{
public:virtual void onDeviceAdded(CameraDevice device) 0;virtual void onDeviceRemoved(CameraDevice device) 0;virtual void onDeviceListUpdate(std::mapstd::string, CameraDevice cameraList) 0;
};class VideoNotificationClient
{
public:class Listener{public:virtual void onDeviceAdded(const std::string uid) 0;virtual void onDeviceRemoved(const std::string uid) 0;};
}
