qt 相机采集线程和处理线程同步代码

以下是一个简单的Qt相机采集线程和处理线程同步的示例代码：

//相机采集线程
class CameraThread : public QThread
{
    Q_OBJECT
public:
    CameraThread(QObject *parent = nullptr) : QThread(parent)
    {
        //初始化相机
        camera = new QCamera(this);
        viewfinder = new QCameraViewfinder(this);
        camera->setViewfinder(viewfinder);
        camera->start();
    }

signals:
    //采集到一帧数据后发送信号
    void frameReady(QImage frame);

protected:
    void run() override
    {
        while (!isInterruptionRequested()) {
            //采集数据
            QImage frame = viewfinder->grab().toImage();
            //发送信号
            emit frameReady(frame);
        }
    }

private:
    QCamera *camera;
    QCameraViewfinder *viewfinder;
};

//处理线程
class ProcessThread : public QThread
{
    Q_OBJECT
public:
    ProcessThread(QObject *parent = nullptr) : QThread(parent)
    {
        //初始化处理器
        processor = new ImageProcessor(this);
    }

public slots:
    //接收相机采集线程发送的信号
    void onFrameReady(QImage frame)
    {
        //加锁
        mutex.lock();
        //处理数据
        QImage processedFrame = processor->process(frame);
        //保存数据
        this->frame = processedFrame;
        //解锁
        mutex.unlock();
    }

signals:
    //处理完成后发送信号
    void resultReady(QImage result);

protected:
    void run() override
    {
        while (!isInterruptionRequested()) {
            //加锁
            mutex.lock();
            //获取数据
            QImage result = frame;
            //解锁
            mutex.unlock();
            //发送信号
            emit resultReady(result);
        }
    }

private:
    ImageProcessor *processor;
    QImage frame;
    QMutex mutex;
};

//主线程
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    CameraThread cameraThread;
    ProcessThread processThread;

    //连接信号与槽
    QObject::connect(&cameraThread, &CameraThread::frameReady,
                     &processThread, &ProcessThread::onFrameReady);
    QObject::connect(&processThread, &ProcessThread::resultReady,
                     [](QImage result) {
                         //显示结果
                         Q_UNUSED(result);
                     });

    //启动线程
    cameraThread.start();
    processThread.start();

    return a.exec();
}

在上面的代码中，相机采集线程通过信号`frameReady`将采集到的一帧数据发送给处理线程。处理线程通过槽`onFrameReady`接收相机采集线程发送的信号，并在处理完成后通过信号`resultReady`将处理结果发送给主线程。同时，为了保证线程安全，我们使用了一个互斥锁`mutex`来对共享数据进行加锁和解锁。