基于QAbstractVideoSurface实现的摄像头数据帧的捕捉

#include "QtCameraWidget.h" #include "ui_QtCameraWidget.h" QtCameraWidget::QtCameraWidget(QWidget *parent) : QWidget(parent), ui(new Ui::QtCameraWidget) { ui->setupUi(this); m_camera = NULL; m_btnSwitchState = true; m_btnRecordState = false; m_curCameraFormat.frameRate = -1; m_curCameraFormat.w = -1; m_curCameraFormat.h = -1; //画面背景为黑色 QPalette backGround; backGround.setColor(QPalette::Background, Qt::black); ui->label->setAutoFillBackground(true); ui->label->setPalette(backGround); //关闭摄像头时提示“NO SIGNAL” m_warnLabel = new QLabel(ui->label); m_warnLabelLayout = new QHBoxLayout; m_warnLabelLayout->addStretch(); m_warnLabelLayout->addWidget(m_warnLabel); m_warnLabelLayout->addStretch(); ui->label->setLayout(m_warnLabelLayout); QFont labelFont; labelFont.setBold(true); labelFont.setItalic(true); labelFont.setPointSize(30); QPalette warnPalette; warnPalette.setColor(QPalette::WindowText, Qt::white); warnPalette.setColor(QPalette::Background, Qt::black); m_warnLabel->setAutoFillBackground(true); m_warnLabel->setPalette(warnPalette); m_warnLabel->setText("NO SIGNAL"); m_warnLabel->setFont(labelFont); m_warnLabel->setVisible(false); //function layout m_pushBtnSwitch = new ToolButton(ui->label_tools); m_pushBtnCapture = new ToolButton(ui->label_tools); m_pushBtnRecord = new ToolButton(ui->label_tools); m_pushBtnInfo = new ToolButton(ui->label_tools); m_pushBtnSetting = new ToolButton(ui->label_tools); m_pushBtndeviceSelect = new ToolButton(ui->label_tools); m_toolsHLayout = new QHBoxLayout; m_toolsHLayout->addStretch(); m_toolsHLayout->addWidget(m_pushBtnSwitch); m_toolsHLayout->addWidget(m_pushBtnCapture); m_toolsHLayout->addWidget(m_pushBtnRecord); m_toolsHLayout->addWidget(m_pushBtnSetting); m_toolsHLayout->addWidget(m_pushBtnInfo); m_toolsHLayout->addWidget(m_pushBtndeviceSelect); m_toolsHLayout->addStretch(); m_toolsHLayout->setMargin(0); ui->label_tools->setAlignment(Qt::AlignVCenter | Qt::AlignHCenter); ui->label_tools->setLayout(m_toolsHLayout); // ui->label->setScaledContents(true); //set icon m_pushBtnSwitch->setText("开关"); m_pushBtnSwitch->setIcon(QPixmap(":/icon/images/OpenCamera.png")); m_pushBtnCapture->setText("拍照"); m_pushBtnCapture->setIcon(QPixmap(":/icon/images/Capture.png")); //TODO:录制功能 m_pushBtnRecord->setEnabled(false); m_pushBtnRecord->setText("录制"); m_pushBtnRecord->setIcon(QPixmap(":/icon/images/RecordStart.png")); m_pushBtnSetting->setText("设置"); m_pushBtnSetting->setIcon(QPixmap(":/icon/images/Setting.png")); m_pushBtnInfo->setText("信息"); m_pushBtnInfo->setIcon(QPixmap(":/icon/images/Info.png")); m_pushBtndeviceSelect->setText("设备"); m_pushBtndeviceSelect->setIcon(QPixmap(":/icon/images/DeviceSelect.png")); //infoDialog m_infoDialog = new InfoDialog(this); m_infoDialog->setFixedSize(180, 200); QPalette infoPalette; infoPalette.setColor(QPalette::WindowText, Qt::white); m_formatLabel = new QLabel(m_infoDialog); m_resolutionLabel = new QLabel(m_infoDialog); m_frameRateLabel = new QLabel(m_infoDialog); m_btnInfoDialog = new QPushButton(m_infoDialog); m_formatLabel->setPalette(infoPalette); m_resolutionLabel->setPalette(infoPalette); m_frameRateLabel->setPalette(infoPalette); m_formatLabel->setFixedSize(m_infoDialog->width(), 30); m_resolutionLabel->setFixedSize(m_infoDialog->width(), 30); m_frameRateLabel->setFixedSize(m_infoDialog->width(), 30); m_btnInfoDialog->setText("确认"); m_formatLabel->move(5, 10); m_resolutionLabel->move(5, 45); m_frameRateLabel->move(5, 80); m_btnInfoDialog->setGeometry(10, m_infoDialog->height() - 40, 160, 30); //deviceDialog m_devicesDialog = new InfoDialog(this); m_deviceList = new QListWidget(m_devicesDialog); m_btnCancelDeviceSelect = new QPushButton(m_devicesDialog); m_btnApplyDeviceSelect = new QPushButton(m_devicesDialog); m_devicesDialog->setFixedSize(180, 200); m_deviceList->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); m_deviceList->setFrameShape(QListWidget::NoFrame); m_deviceList->setStyleSheet("color : white; background-color : rgb(60, 60, 60)"); m_deviceList->setMaximumSize(m_devicesDialog->width(), m_devicesDialog->height() - 60); m_deviceList->setMinimumSize(m_devicesDialog->width(), m_devicesDialog->height() - 60); m_deviceList->move(0, 10); m_btnCancelDeviceSelect->setText("取消"); m_btnApplyDeviceSelect->setText("确认"); m_btnApplyDeviceSelect->setGeometry(10, m_devicesDialog->height() - 40, 77, 30); m_btnCancelDeviceSelect->setGeometry(93, m_devicesDialog->height() - 40, 77, 30); //settingDialog m_settingDialog = new InfoDialog(this); m_formatGroupBox = new QGroupBox(m_settingDialog); m_resolutionGroupBox = new QGroupBox(m_settingDialog); m_formatBox = new QComboBox(m_formatGroupBox); m_resolutionBox = new QComboBox(m_resolutionGroupBox); m_btnApplySettingDialog = new QPushButton(m_settingDialog); m_btnCancelSettingDialog = new QPushButton(m_settingDialog); m_filePathLabel = new QLabel(m_settingDialog); m_fmtBoxLayout = new QHBoxLayout; m_resolutionBoxLayout = new QHBoxLayout; QPalette textColor; textColor.setColor(QPalette::WindowText, Qt::white); m_formatGroupBox->setPalette(textColor); m_resolutionGroupBox->setPalette(textColor); m_filePathLabel->setPalette(textColor); //setting text m_settingDialog->setFixedSize(330, 180); m_formatGroupBox->setTitle("图像格式"); m_resolutionGroupBox->setTitle("分辨率"); m_btnApplySettingDialog->setText("确认"); m_btnCancelSettingDialog->setText("取消"); //functionArea layout m_formatGroupBox->setGeometry(10, 10, 152, 80); m_resolutionGroupBox->setGeometry(168, 10, 152, 80); m_filePathLabel->setGeometry(10, 85, 310, 50); m_btnApplySettingDialog->setGeometry(10, 140, 152, 30); m_btnCancelSettingDialog->setGeometry(168, 140, 152, 30); m_fmtBoxLayout->addWidget(m_formatBox); m_formatGroupBox->setLayout(m_fmtBoxLayout); m_resolutionBoxLayout->addWidget(m_resolutionBox); m_resolutionGroupBox->setLayout(m_resolutionBoxLayout); //signals and slots: connect(m_pushBtnSwitch, SIGNAL(clicked()), this, SLOT(btnSwitchClicked())); connect(m_pushBtnCapture, SIGNAL(clicked()), this, SLOT(btnCpatureClicked())); connect(m_pushBtnRecord, SIGNAL(clicked()), this, SLOT(btnRecordClicked())); connect(m_pushBtnInfo, SIGNAL(clicked()), this, SLOT(btnInfoClicked())); connect(m_pushBtnSetting, SIGNAL(clicked()), this, SLOT(btnSettingClicked())); connect(m_btnInfoDialog, SIGNAL(clicked()), this, SLOT(btnOkInfoClicked())); connect(m_pushBtndeviceSelect, SIGNAL(clicked()), this, SLOT(btnDeviceSelect())); connect(m_btnCancelSettingDialog, SIGNAL(clicked()), this, SLOT(btnCancelSettingClicked())); connect(m_btnApplySettingDialog, SIGNAL(clicked()), this, SLOT(btnApplySettingClicked())); connect(m_btnCancelDeviceSelect, SIGNAL(clicked()), this, SLOT(btnCancelDeviceClicked())); connect(m_btnApplyDeviceSelect, SIGNAL(clicked()), this, SLOT(btnApplyDeviceClicked())); //camera device m_camera = new QtCamera; connect(m_camera, SIGNAL(onImageOutput(QImage)), this, SLOT(showImage(QImage))); m_camera->start(); if (! m_camera->isStarted()) { m_warnLabel->setVisible(true); return; } m_cam