QT linux v4l2下多線程視頻採集播放

一，按建立QT工程

二，繪製顯示視窗

三，添加程式（由於v4l2程式過長就沒貼出請到資源下載）

1，背景工作執行緒代碼

video_thread::video_thread():QThread() { quit_flag = false; } video_thread::~video_thread() { this->quit(); quit_flag = true; this->wait(); } void video_thread::run() { m_video.init_video();//開啟視頻裝置 while(!quit_flag) { m_video.get_data();//擷取視頻資料 unsigned char *rgb; rgb = new unsigned char [m_video.buf.length*2];//根據yuyv像素點和rgb像素所站記憶體比分配rgb m_video.yuvtorgbO(rgb,640,480);//yuyv轉換成RGB QImage img = QImage(rgb,640,480,QImage::Format_RGB888); emit image_data(img); msleep(150); delete[] rgb;//不能在sleep前釋放掉否則顯示的圖片會出現問題 } m_video.release_video();//線上程釋放前釋放裝置 }

2.主線程程式

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); connect(ui->show_ptn,SIGNAL(clicked()),this,SLOT(start_thread())); connect(ui->stop_ptn,SIGNAL(clicked()),this,SLOT(stop_thread())); connect(ui->quit_ptn,SIGNAL(clicked()),this,SLOT(close())); } void MainWindow::start_thread() { video = new video_thread(); video->start(); connect(video,SIGNAL(image_data(const QImage &)),this,SLOT(show_picture(const QImage &))); } void MainWindow::show_picture(const QImage &img) { ui->show_label->setPixmap(QPixmap::fromImage(img)); } void MainWindow::stop_thread() { delete video; } MainWindow::~MainWindow() { delete ui; }

3，程式

：點擊開啟連結