项目实战：Qt+FFmpeg录屏应用（支持帧率、清晰度设置）

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本文章博客地址：https://blog.csdn.net/qq21497936/article/details/109827936

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红胖子(红模仿)的博文大全：开发技术集合（包含Qt实用技术、树莓派、三维、OpenCV、OpenGL、ffmpeg、OSG、单片机、软硬结合等等）持续更新中…（点击传送门）

Qt开发专栏：项目实战（点击传送门）

需求

  实现录屏功能。

原理

  使用抓屏模块按照指定范围和帧率抓屏，同时使用录像模块按照指定图像大小和帧率录制。

Demo

体验下载地址

CSDN：https://download.csdn.net/download/qq21497936/13126842

QQ群：1047134658（点击“文件”搜索“ffmpegRecord”，群内与博文同步更新）

v1.0.0

#ifndef RECORDWIDGET_H

#define RECORDWIDGET_H

#include <QWidget>

#include <QThread>

#include <QFileDialog>

#include <QDateTime>

#include "GrabWindowManager.h"

#include "FFmpegRecordManager.h"

namespace Ui {

class RecordWidget;

}

class RecordWidget : public QWidget

{

    Q_OBJECT

public:

    explicit RecordWidget(QWidget *parent = 0);

    ~RecordWidget();

protected slots:

    void slot_timeChange(int time);

private slots:

    void on_pushButton_startRecord_clicked();

    void on_pushButton_stopRecord_clicked();

    void on_pushButton_browser_clicked();

private:

    Ui::RecordWidget *ui;

    GrabWindowManager *_pGrabWindowManager;        // 抓屏管理类

    QThread *_pGrabWindowManagerThread;            // 抓屏线程

    FFmpegRecordManager *_pFFmpegRecordManager;    // 录制管理类

    QThread *_pFFmpegRecordManagerThread;          // 录制线程

};

#endif // RECORDWIDGET_H

#include "RecordWidget.h"

#include "ui_RecordWidget.h"

#include <QDateTime>

RecordWidget::RecordWidget(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::RecordWidget),

    _pGrabWindowManager(0),

    _pGrabWindowManagerThread(0)

{

    ui->setupUi(this);

    QString version = "v1.0.0";

    setWindowTitle(QString("录屏Demo %1(作者：红胖子(AAA红模仿) QQ:21497936 微信:yangsir198808 博客地址:blog.csdn.net/qq21497936)").arg(version));

    // 初始化抓屏线程

    _pGrabWindowManagerThread = new QThread();

    _pGrabWindowManager = new GrabWindowManager();

    _pGrabWindowManager->moveToThread(_pGrabWindowManagerThread);

    connect(_pGrabWindowManager, SIGNAL(signal_timeChange(int)),

            this, SLOT(slot_timeChange(int)));

    _pGrabWindowManagerThread->start();

    // 初始化录制线程

    _pFFmpegRecordManagerThread = new QThread();

    _pFFmpegRecordManager = new FFmpegRecordManager();

    _pFFmpegRecordManager->moveToThread(_pFFmpegRecordManagerThread);

    connect(_pFFmpegRecordManagerThread, SIGNAL(started()),

            _pFFmpegRecordManager, SLOT(slot_start()));

    _pFFmpegRecordManagerThread->start();

    // 关联信号

    connect(_pGrabWindowManager, SIGNAL(signal_grapWindow(QImage)),

            _pFFmpegRecordManager, SLOT(slot_encoderOneFrame(QImage)));

    // 按键状态初始化

    ui->pushButton_startRecord->setEnabled(true);

    ui->pushButton_stopRecord->setEnabled(false);

    ui->lineEdit_dirPath->setReadOnly(true);

    ui->lineEdit_dirPath->setText(QCoreApplication::applicationDirPath());

    ui->lineEdit_value->setValidator(new QIntValidator(1, 100));

    ui->lineEdit_fps->setValidator(new QIntValidator(5, 50));

}

RecordWidget::~RecordWidget()

{

    delete ui;

}

void RecordWidget::slot_timeChange(int time)

{

    ui->label_time->setText(QString("%1%2:%3%4").arg(time/60/10)

                                                .arg(time/60%10)

                                                .arg(time%60/10)

                                                .arg(time%10));

}

void RecordWidget::on_pushButton_startRecord_clicked()

{

    slot_timeChange(0);

    QScreen *pScreen = QGuiApplication::primaryScreen();

    QRect rect = pScreen->availableGeometry();

    _pFFmpegRecordManager->setFps(ui->lineEdit_fps->text().toInt());

    _pFFmpegRecordManager->setWidthIn(rect.width());

    _pFFmpegRecordManager->setHeightIn(rect.height());

    _pFFmpegRecordManager->setWidthOut(rect.width());

    _pFFmpegRecordManager->setHeightOut(rect.height());

    _pFFmpegRecordManager->setValue(ui->lineEdit_value->text().toInt());

    _pFFmpegRecordManager->slot_startEncoder(QString("%1/%2.mp4")

                                            .arg(ui->lineEdit_dirPath->text())

                                            .arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh_mm_ss")),

                                            AV_PIX_FMT_BGRA);

    _pGrabWindowManager->slot_startGrabWindow(rect.x(),

                                              rect.y(),

                                              rect.width(),

                                              rect.height(),

                                              ui->lineEdit_fps->text().toInt());

    ui->pushButton_startRecord->setEnabled(false);

    ui->pushButton_stopRecord->setEnabled(true);

    ui->pushButton_browser->setEnabled(false);

    ui->lineEdit_fps->setEnabled(false);

    ui->lineEdit_value->setEnabled(false);

}

void RecordWidget::on_pushButton_stopRecord_clicked()

{

    _pGrabWindowManager->slot_stopGrabWindow();

    _pFFmpegRecordManager->slot_stopEncoder();

    ui->pushButton_startRecord->setEnabled(true);

    ui->pushButton_stopRecord->setEnabled(false);

    ui->pushButton_browser->setEnabled(true);

    ui->lineEdit_fps->setEnabled(true);

    ui->lineEdit_value->setEnabled(true);

}

void RecordWidget::on_pushButton_browser_clicked()

{

    QString dir = QFileDialog::getExistingDirectory(0, "保存到文件夹", ".");

    if(dir.isEmpty())

    {

        return;

    }

    ui->lineEdit_dirPath->setText(dir);

}

若该文为原创文章，转载请注明原文出处

本文章博客地址：https://blog.csdn.net/qq21497936/article/details/109827936