Qt移动开发-获取摄像头画面显示(完整工程).zip

#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); ss_log("程序正常运行.\n"); } Widget::~Widget() { delete ui; } bool checkPermission_usb() { QtAndroid::PermissionResult r = QtAndroid::checkPermission("android.permission.USB_PERMISSION"); if(r == QtAndroid::PermissionResult::Denied) { QtAndroid::requestPermissionsSync( QStringList() << "android.permission.USB_PERMISSION" ); r = QtAndroid::checkPermission("android.permission.USB_PERMISSION"); if(r == QtAndroid::PermissionResult::Denied) { return false; } } return true; } bool checkPermission_usb2() { QtAndroid::PermissionResult r = QtAndroid::checkPermission("android.hardware.usb.host"); if(r == QtAndroid::PermissionResult::Denied) { QtAndroid::requestPermissionsSync( QStringList() << "android.hardware.usb.host" ); r = QtAndroid::checkPermission("android.hardware.usb.host"); if(r == QtAndroid::PermissionResult::Denied) { return false; } } return true; } bool requestPermission() { QtAndroid::PermissionResult r = QtAndroid::checkPermission("android.permission.CAMERA"); if(r == QtAndroid::PermissionResult::Denied) { QtAndroid::requestPermissionsSync( QStringList() << "android.permission.CAMERA" ); r = QtAndroid::checkPermission("android.permission.CAMERA"); if(r == QtAndroid::PermissionResult::Denied) { return false; } } return true; } int Widget::Camear_Init() { checkPermission_usb(); checkPermission_usb2(); requestPermission(); bool r_run; /*创建摄像头对象，根据选择的摄像头打开*/ camera = new QCamera(m_camera); if(camera==nullptr)return -1; connect(camera, QOverload<QCamera::Error>::of(&QCamera::error), [=](QCamera::Error value) { if(value!=QCamera::NoError) { emit ss_log("摄像头初始化错误!\n"); } }); m_pProbe = new QVideoProbe; if(m_pProbe==nullptr)return -1; r_run=m_pProbe->setSource(camera); // Returns true, hopefully. if(r_run==false)return -1; connect(m_pProbe, SIGNAL(videoFrameProbed(QVideoFrame)),this, SLOT(slotOnProbeFrame(QVideoFrame)),Qt::DirectConnection); /*配置摄像头捕 QCamera *camera; QVideoProbe *m_pProbe;获模式为帧捕获模式*/ camera->setCaptureMode(QCamera::CaptureVideo); /*设置摄像头的采集帧率和分辨率*/ QCameraViewfinderSettings settings; settings.setPixelFormat(QVideoFrame::Format_NV12); //设置像素格式 Android上只支持NV21格式 settings.setResolution(QSize(m_recv_w,m_recv_h)); //设置摄像头的分辨率 camera->setViewfinderSettings(settings); /*启动摄像头*/ camera->start(); return 0; } /* 函数功能: 将YUV数据转为RGB格式 函数参数: unsigned char *yuv_buffer: YUV源数据 unsigned char *rgb_buffer: 转换之后的RGB数据 int iWidth,int iHeight : 图像的宽度和高度 */ void yuyv_to_rgb(unsigned char *yuv_buffer,unsigned char *rgb_buffer,int iWidth,int iHeight) { int x; int z=0; unsigned char *ptr = rgb_buffer; unsigned char *yuyv= yuv_buffer; for (x = 0; x < iWidth*iHeight; x++) { int r, g, b; int y, u, v; if (!z) y = yuyv[0] << 8; else y = yuyv[2] << 8; u = yuyv[1] - 128; v = yuyv[3] - 128; r = (y + (359 * v)) >> 8; g = (y - (88 * u) - (183 * v)) >> 8; b = (y + (454 * u)) >> 8; *(ptr++) = (r > 255) ? 255 : ((r < 0) ? 0 : r); *(ptr++) = (g > 255) ? 255 : ((g < 0) ? 0 : g); *(ptr++) = (b > 255) ? 255 : ((b < 0) ? 0 : b); if(z++) { z = 0; yuyv += 4; } } } void NV21_TO_RGB24(unsigned char *yuyv, unsigned char *rgb, int width, int height) { const int nv_start = width * height ; int index = 0, rgb_index = 0; uint8_t y, u, v; int r, g, b, nv_index = 0,i, j; for(i = 0; i < height; i++){ for(j = 0; j < width; j ++){ //nv_index = (rgb_index / 2 - width / 2 * ((i + 1) / 2)) * 2; nv_index = i / 2 * width + j - j % 2; y = yuyv[rgb_index]; u = yuyv[nv_start + nv_index ]; v = yuyv[nv_start + nv_index + 1]; r = y + (140 * (v-128))/100; //r g = y - (34 * (u-128))/100 - (71 * (v-128))/100; //g b = y + (177 * (u-128))/100; //b if(r > 255) r = 255; if(g > 255) g = 255; if(b > 255) b = 255; if(r < 0) r = 0; if(g < 0) g = 0; if(b < 0) b = 0; index = rgb_index % width + (height - i - 1) * width; //rgb[index * 3+0] = b; //rgb[index * 3+1] = g; //rgb[index * 3+2] = r; //颠倒图像 //rgb[height * width * 3 - i * width * 3 - 3 * j - 1] = b; //rgb[height * width * 3 - i * width * 3 - 3 * j - 2] = g; //rgb[height * width * 3 - i * width * 3 - 3 * j - 3] = r; //正面图像 rgb[i * width * 3 + 3 * j + 0] = b; rgb[i * width * 3 + 3 * j + 1] = g; rgb[i * width * 3 + 3 * j + 2] = r; rgb_index++; } } } void Widget::slotOnProbeFrame(const QVideoFrame &frame) { QVideoFrame cloneFrame(frame); cloneFrame.map(QAbstractVideoBuffer::ReadOnly); unsigned char *rgb_buffer=new unsigned char[m_recv_w*m_recv_h*3]; if(cloneFrame.pixelFormat()==QVideoFrame::Format_YUYV) { yuyv_to_rgb(cloneFrame.bits(),rgb_buffer,cloneFrame.width(),cloneFrame.height()); } else if(cloneFrame.pixelFormat()==QVideoFrame::Format_NV21) { NV21_TO_RGB24(cloneFrame.bits(),rgb_buffer,cloneFrame.width(),cloneFrame.height()); } else { ss_log("当前摄像头格式编码为%1,暂时不支持转换.\n"); //加载图片数据 QImage image; image.loadFromData((char *)cloneFrame.bits()); ui->widget->setImage(image); return; } cloneFrame.unmap(); //加载图片数据 QImage image(rgb_buffer, cloneFrame.width(), cloneFrame.height(), QImage::Format_RGB888); ui->widget->setImage(image); //删除数组空间 delete []rgb_buffer; } void Widget::ss_log(QString text) { QPlainTextEdit *plainTextEdit_log=ui->plainTextEdit; //设置只读 if(!plainTextEdit_log->isReadOnly()) { plainTextEdit_log->setReadOnly(true); } //设置光标到文本末尾 plainTextEdit_log->moveCursor(QTextCursor::End, QTextCursor::MoveAnchor); //当文本数量超出一定范围就清除 if(plainTextEdit_log->toPlainText().size()>1024*4) { plainTextEdit_log->clear(); } plainTextEdit_log->insertPlainText(text); //移动滚动条到底部 QScrollBar *scrollbar = plainTextEdit_log->verticalScrollBar(); if(scrollbar) { scrollbar->setSliderPosition(scrollbar->maximum()); } } void Widget::on_pushButton_update_ip_list_clicked() { //摄像头刷新 video_dev_list.clear(); ui->comboBox_camera->clear(); video_dev_list=QCameraInfo::availableCameras(); for(int i=0;i<video_dev_list.size();i++) { ui->comboBox_camera->addItem(QString("%1").arg(i)); } } void Widget::on_pushButton_open_clicked() { if(ui->pushButton_open->text()=="打开") { if(video_dev_list.s