Qt+FFmpeg播放RTSP H264视频流（3）- RTSP视频流播放

RTSP视频播放器

通过上两篇博客：Qt+FFmpeg播放RTSP H264视频流（1）- 在Qt项目加入FFmpeg库 和Qt+FFmpeg播放RTSP H264视频流（2）- FFmpeg自定义类封装已经大概了解了FFmpeg的工作过程，本编接上两篇完成一个简单的RTSP播放器。大致界面如下，代码下载地址：Qt工程完整代码下载

播放逻辑如下：

RTSP_Player播放类

RTSP_Player.h

#ifndef RTSP_PLAYER_H
#define RTSP_PLAYER_H

#include "MyFFmpeg.h"
#include 


class RTSP_Player : public QObject
{
    Q_OBJECT
public:
    enum PlayerState {
        FFmpegInitFail = 0,
        FFmpegInitSucc,
        FFmpegStoped
    };

    explicit RTSP_Player(MyFFmpeg *ffmpeg = nullptr, QObject *parent = nullptr);
    void SetPlayerUrl(QString playerUrl);

signals:
    void SigOpenUrlResult(int result);

public slots:
    void PlayerStart();
    void PlayerStop();

private:
    volatile bool   m_stopped;				// 停止播放标识，为true时停止播放，退出播放循环
    QString         m_playerUrl;			// 播放url
    MyFFmpeg        *m_ffmpeg;				// MyFFmepg指针
};

#endif // RTSP_PLAYER_H

RTSP_Player.cpp

#include "RTSP_Player.h"
#include 

RTSP_Player::RTSP_Player(MyFFmpeg *ffmpeg, QObject *parent)
    : QObject(parent)
    , m_ffmpeg(ffmpeg)
{

}

void RTSP_Player::SetPlayerUrl(QString playerUrl)
{
    this->m_playerUrl = playerUrl;
}

void RTSP_Player::PlayerStart()
{
    if (m_ffmpeg == NULL){
        emit SigOpenUrlResult(RTSP_Player::FFmpegInitFail);
        return;
    }

    m_ffmpeg->MyFFmpegSetUrl(this->m_playerUrl);
    if (m_ffmpeg->MyFFmpegInit() != 0) {
        emit SigOpenUrlResult(RTSP_Player::FFmpegInitFail);
        return;
    }

    emit SigOpenUrlResult(RTSP_Player::FFmpegInitSucc);

    m_stopped = false;

    while (1) {
        if (m_stopped){
            qDebug("--------------- stop ----------------");
            break;
        }

        if (!m_ffmpeg) {
            break;
        }

        if (m_ffmpeg->MyFFmpepReadFrame() < 0) {
            qDebug("--------------- get frame fail, stop -----------");
            break;
        }
        
        QThread::msleep(0.02);
    }

    m_ffmpeg->MyFFmpegDestroy();
    emit SigOpenUrlResult(RTSP_Player::FFmpegStoped);
    qDebug("---------------- quit -----------------");

    return;
}

void RTSP_Player::PlayerStop()
{
    m_stopped = true;
}

FFmpegLibTestFrm UI界面类

FFmpegLibTestFrm.h

#ifndef FFMPEGLIBTESTFRM_H
#define FFMPEGLIBTESTFRM_H

#include 
#include 
#include 
#include "RTSP_Player.h"

namespace Ui {
class FFmpegLibTestFrm;
}

class FFmpegLibTestFrm : public QMainWindow
{
    Q_OBJECT

public:
    explicit FFmpegLibTestFrm(QWidget *parent = 0);
    ~FFmpegLibTestFrm();

    void MyFFmpegTest();

    void PlayStart();
    void PlayStop();
    void PlayProcess();

protected:
    void paintEvent(QPaintEvent *e);
    void closeEvent(QCloseEvent *e);

private slots:
    void SlotGetOneFrame(QImage img);
    void SlotOpenUrlResult(int result);

    void on_btnPlayer_clicked();

signals:
    void SigPlayStart();

private:
    QString      m_playUrl;
    MyFFmpeg    *m_ffmpeg = nullptr;
    RTSP_Player *m_player = nullptr;
    QImage       m_image;
    QThread     *m_playThread = nullptr;

private:
    Ui::FFmpegLibTestFrm *ui;
};

#endif // FFMPEGLIBTESTFRM_H

FFmpegLibTestFrm.cpp

#include "FFmpegLibTestFrm.h"
#include "ui_FFmpegLibTestFrm.h"
#include "MyHelper.h"
#include 

extern "C"
{
#include 
#include 
#include 
#include 
#include 
#include 
#include 
}

FFmpegLibTestFrm::FFmpegLibTestFrm(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::FFmpegLibTestFrm)
{
    ui->setupUi(this);

    m_ffmpeg = new MyFFmpeg;
    connect(m_ffmpeg, SIGNAL(MyFFmpegSigGetOneFrame(QImage)), this, SLOT(SlotGetOneFrame(QImage)));

    ui->labVideo->setStyleSheet("QLabel{border:2px solid green}");
    ui->labVideo->installEventFilter(this);
    ui->btnPlayer->setEnabled(true);
}

FFmpegLibTestFrm::~FFmpegLibTestFrm()
{
    delete ui;
}

void FFmpegLibTestFrm::MyFFmpegTest()
{
    MyFFmpeg *ffmpeg = new MyFFmpeg();

    QString rtspUrl = "rtsp://192.168.88.168:554/0";
    ffmpeg->MyFFmpegSetUrl(rtspUrl);
    if (ffmpeg->MyFFmpegInit() == 0) {
        int i;
        for (i = 0; i < 5; i++) {
            ffmpeg->MyFFmpepReadFrame();
        }
    } else {
        qDebug("MyFFmpegInit fail!\n");
    }

    delete ffmpeg;
}

void FFmpegLibTestFrm::PlayStop()
{
    if (m_player)
    {
        m_player->PlayerStop();
    }

    if (m_playThread)
    {
        m_playThread->quit();
        m_playThread->wait(1000);
        delete m_playThread;
        m_playThread = nullptr;
    }

    if (m_player)
    {
        delete m_player;
        m_player = nullptr;
    }
}

void FFmpegLibTestFrm::PlayStart()
{
    this->PlayStop();

    m_playThread = new QThread();
    m_player = new RTSP_Player(m_ffmpeg);
    m_player->SetPlayerUrl(m_playUrl);

    connect(this, SIGNAL(SigPlayStart()), m_player, SLOT(PlayerStart()));
    connect(m_player, SIGNAL(SigOpenUrlResult(int)), this, SLOT(SlotOpenUrlResult(int)));

    m_player->moveToThread(m_playThread);
    m_playThread->start();
}

void FFmpegLibTestFrm::PlayProcess()
{
    this->PlayStart();
    emit SigPlayStart();
}

void FFmpegLibTestFrm::SlotOpenUrlResult(int result)
{
    if (result == RTSP_Player::FFmpegInitFail)
    {
        this->PlayStop();

        QString rtspUrl = ui->txtRTSPURL->text().trimmed();
        QString errMsg = "打开" + rtspUrl + "失败";
        MyHelper::ShowMessageBoxError(errMsg);
        ui->btnPlayer->setText("start");
    }
    else if (result == RTSP_Player::FFmpegInitSucc)
    {
        ui->btnPlayer->setText("stop");
    }
    else if (result == RTSP_Player::FFmpegStoped)
    {
        ui->btnPlayer->setText("start");
    }

    ui->btnPlayer->setEnabled(true);
}

void FFmpegLibTestFrm::SlotGetOneFrame(QImage image)
{
    m_image = image;
    this->update();
}

void FFmpegLibTestFrm::closeEvent(QCloseEvent *event)
{
    this->PlayStop();
}

void FFmpegLibTestFrm::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);

    if (m_image.size().width() <= 0)
        return;

    QImage img = m_image.scaled(ui->labVideo->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

    int x = ui->labVideo->geometry().x();
    int y = ui->labVideo->geometry().y();
    painter.drawImage(QPoint(x, y), img);
}

void FFmpegLibTestFrm::on_btnPlayer_clicked()
{
    if (ui->btnPlayer->text().compare("start") == 0) {
        m_playUrl = ui->txtRTSPURL->text().trimmed();
        if (m_playUrl.length() <= (int)strlen("rtsp://")) {
            MyHelper::ShowMessageBoxError("请输入rtsp播放地址!");
            return;
        }

        ui->btnPlayer->setEnabled(false);
        this->PlayProcess();
    } else if (ui->btnPlayer->text().compare("stop") == 0) {
        ui->btnPlayer->setEnabled(false);
        this->PlayStop();
    }
}

播放效果

代码下载

完整demo代码