FFMPEG音頻視頻開發：Windows下基於QT+FFMPEG設計的攝像頭視頻推流與視頻錄製保存軟件(採用QT庫讀取攝像頭數據和音頻)

一、基本介紹

該軟件裏推流和視頻保存使用FFMPEG庫完成，視頻和音頻可以同步推流和錄製，FFMPEG本身支持跨平臺編譯開發，QT也支持跨平臺，在Android、Linux、windows都運行良好，只需要在不同平臺編譯對應的ffmpeg庫即可，邏輯代碼部分通用。

由於核心代碼和在發表博客裏的代碼差不多這裏就不再貼出代碼。

FFMPEG編程使用參考的鏈接: 

(1) 使用NDKR19C編譯最新的FFMPEG和X264給Android平臺使用：https://blog.csdn.net/xiaolong1126626497/article/details/104734472

(2) linux下使用QT調用FFMPEG讀取攝像頭一幀數據顯示到標籤控件上

https://blog.csdn.net/xiaolong1126626497/article/details/104719820

(3) QT在Android設備上實現FFMPEG開發: 完成拍照、MP4視頻錄製、rtsp推流

https://blog.csdn.net/xiaolong1126626497/article/details/104760149

(4) QT獲取Android、Linux、Windows系統上的攝像頭數據幀與聲卡音頻通過FFMPEG編碼爲MP4存儲(v1.0)

https://blog.csdn.net/xiaolong1126626497/article/details/104858499

(5) QT採集攝像頭數據幀與聲卡音頻通過FFMPEG實時推流到RTMP服務器(v1.0)

https://blog.csdn.net/xiaolong1126626497/article/details/104866323

二、windows下軟件運行效果

（1）主界面效果

（2）保存視頻到本地，設置錄製間隔爲10秒一個視頻

（3）推流視頻到B站，必須保證RTMP地址是有效的，如果地址無效軟件會自動退出

 

三、核心代碼

代碼裏除了FFMEG代碼之外，主要的核心代碼是攝像頭顏色轉換代碼，因爲不同的攝像頭輸出的原始格式不一樣，代碼裏還需要做顏色轉換。

void VideoReadThread_0::slotOnProbeFrame(const QVideoFrame &frame)
{
   QVideoFrame cloneFrame(frame);
   cloneFrame.map(QAbstractVideoBuffer::ReadOnly);
  // qDebug()<<"height:"<<cloneFrame.height();
  // qDebug()<<"width:"<<cloneFrame.width();
   //qDebug()<<"bytesPerLine:"<<cloneFrame.bytesPerLine();
   //qDebug()<<"mappedBytes:"<<cloneFrame.mappedBytes();
   //qDebug()<<"pixelFormat:"<<cloneFrame.pixelFormat();

   unsigned char rgb_buffer[VIDEO_WIDTH*VIDEO_HEIGHT*3];
   if(cloneFrame.pixelFormat()==QVideoFrame::Format_NV21)
   {
        NV21_TO_RGB24(cloneFrame.bits(),rgb_buffer,cloneFrame.width(),cloneFrame.height());
   }
   else if(cloneFrame.pixelFormat()==QVideoFrame::Format_YUYV)
   {
       yuyv_to_rgb(cloneFrame.bits(),rgb_buffer,cloneFrame.width(),cloneFrame.height());
   }
   else if(cloneFrame.pixelFormat()==QVideoFrame::Format_RGB24)
   {
        memcpy(rgb_buffer,cloneFrame.bits(),sizeof(rgb_buffer));
   }
   else if(cloneFrame.pixelFormat()==QVideoFrame::Format_BGR24)
   {
        memcpy(rgb_buffer,cloneFrame.bits(),sizeof(rgb_buffer));
   }
   else if(cloneFrame.pixelFormat()==QVideoFrame::Format_Jpeg)
   {

   }
   else
   {
       qDebug("當前格式編碼爲%1,暫時不支持轉換.\n");
   }

    //加載圖片數據
    QImage image(rgb_buffer,
                       cloneFrame.width(),
                       cloneFrame.height(),
                       QImage::Format_RGB888);
    if(cloneFrame.pixelFormat()==QVideoFrame::Format_BGR24)
    {
        image=image.rgbSwapped(); //BGR格式轉RGB
        image=image.mirrored(false, true);
    }
    if(cloneFrame.pixelFormat()==QVideoFrame::Format_Jpeg)
    {
        image.loadFromData((const uchar *)cloneFrame.bits(),cloneFrame.mappedBytes());
    }

    //繪製圖片水印
    QDateTime dateTime(QDateTime::currentDateTime());
    //時間效果: 2020-03-05 16:25::04 週一
    QString qStr="";
    qStr+=dateTime.toString("yyyy-MM-dd hh:mm:ss ddd");
    QPainter pp(&image);
    QPen pen = QPen(Qt::white);
    pp.setPen(pen);
    pp.drawText(QPointF(0,20),qStr);

    //提取RGB數據
    unsigned char *p=rgb_buffer;
    for(int i=0;i<image.height();i++)
    {
        for(int j=0;j<image.width();j++)
        {
            QRgb rgb=image.pixel(j,i);
            *p++=qRed(rgb);
            *p++=qGreen(rgb);
            *p++=qBlue(rgb);
        }
    }
    videoaudioencode_0.video_encode_mutex.lock();
    RGB24_TO_YUV420(rgb_buffer,image.width(),image.height(),video_yuv420p_buff);
    videoaudioencode_0.video_encode_mutex.unlock();
    videoaudioencode_0.video_WaitConditon.wakeAll();
    emit VideoDataOutput(image); //發送信號
    cloneFrame.unmap();
}

 

xxx.pro工程文件代碼：

QT       += core gui
QT       += multimediawidgets
QT       += xml
QT       += multimedia
QT       += network
QT       += widgets
QT       += serialport
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    Color_conversion.cpp \
    audio_video_encode_0.cpp \
    ffmpeg_code.cpp \
    main.cpp \
    widget.cpp

HEADERS += \
    Color_conversion.h \
    audio_video_encode_0.h \
    config.h \
    ffmpeg_code.h \
    widget.h

FORMS += \
    widget.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RC_ICONS=log.ico

win32
{
    message('運行win32版本')
    INCLUDEPATH+=$$PWD/ffmpeg-win32-shared-dll/include
    LIBS+=$$PWD/ffmpeg-win32-shared-dll/bin/av*
    LIBS+=$$PWD/ffmpeg-win32-shared-dll/bin/sw*
    LIBS+=$$PWD/ffmpeg-win32-shared-dll/bin/pos*
}

RESOURCES += \
    image.qrc

四、軟件和FFMEG庫下載地址

第一版下載地址(沒有支持輸出JPEG和RGB24的攝像頭):  https://download.csdn.net/download/xiaolong1126626497/12304729

第二版下載地址(支持輸出JPEG、RGB24、YUYV、NV21、BGR24源數據的攝像頭):https://download.csdn.net/download/xiaolong1126626497/12304904

 

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