在Qt中编写会议室应用程序通常涉及到用户界面设计、网络通信、音频/视频处理等方面。以下是创建一个基本会议室应用程序的步骤概述：

项目设置：

使用Qt Creator创建一个新的Qt Widgets Application或Qt Quick Application项目。
用户界面设计：

设计主窗口，包含必要的布局和控件，例如视频显示窗口、音频控制、聊天窗口、参与者列表等。
音频/视频处理：

使用QCamera和QCameraViewfinder来访问和显示摄像头视频。
使用QAudioInput和QAudioOutput来处理音频输入和输出。
网络通信：

实现会议室的网络通信功能，可以使用QTcpSocket、QUdpSocket或更高级别的库如QWebSocket。
用户认证和管理：

集成用户登录和认证机制，可能需要使用数据库或远程服务器验证用户。
会议室控制：

实现会议室的控制逻辑，如创建会议室、加入会议室、主持人控制等。
数据同步：

确保所有参与者都能同步更新，如聊天消息、参与者状态等。
错误处理和用户反馈：

添加必要的错误处理和用户操作反馈机制。
测试和优化：

对应用程序进行测试，确保功能正常，优化性能和用户体验。
部署：

准备应用程序的发布，包括编译、打包和分发。

这里只能展示部分代码

#pragma execution_character_set("utf-8")

#include "animationbutton1.h"
#include "qpainter.h"
#include "qpropertyanimation.h"
#include "qdebug.h"

AnimationButton1::AnimationButton1(QWidget *parent) : QWidget(parent)
{
    enter = true;
    leave = false;
    pixWidth = 0;
    pixHeight = 0;
    oldWidth = 0;
    oldHeight = 0;

    enterAnimation = new QPropertyAnimation(this, "");
    enterAnimation->setStartValue(0);
    enterAnimation->setEndValue(5);
    enterAnimation->setDuration(400);
    connect(enterAnimation, SIGNAL(valueChanged(QVariant)), this, SLOT(enterImageChanged(QVariant)));

    leaveAnimation = new QPropertyAnimation(this, "");
    leaveAnimation->setStartValue(0);
    leaveAnimation->setEndValue(5);
    leaveAnimation->setDuration(400);
    connect(leaveAnimation, SIGNAL(valueChanged(QVariant)), this, SLOT(leaveImageChanged(QVariant)));
}

AnimationButton1::~AnimationButton1()
{
    delete enterAnimation;
    delete leaveAnimation;
}

void AnimationButton1::enterEvent(QEvent *)
{
    enter = true;
    leave = false;
    pixWidth = pixWidth - 25;
    pixHeight = pixHeight - 25;
    enterAnimation->start();
}

void AnimationButton1::leaveEvent(QEvent *)
{
    enter = false;
    leave = true;
    pixWidth = oldWidth;
    pixHeight = oldHeight;
    leaveAnimation->start();
}

void AnimationButton1::paintEvent(QPaintEvent *)
{
    if (imageName.isEmpty()) {
        return;
    }

    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);

    QPixmap pix(imageName);
    pix = pix.scaled(targetWidth, targetHeight, Qt::KeepAspectRatio, Qt::SmoothTransformation);

    if (enter || leave) {
        int pixX = rect().center().x() - targetWidth / 2;
        int pixY = rect().center().y() - targetHeight / 2;
        QPoint point(pixX, pixY);
        painter.drawPixmap(point, pix);
    }
}

void AnimationButton1::enterImageChanged(QVariant index)
{
    int i = index.toInt();
    targetWidth = pixWidth + i * 5;
    targetHeight = pixHeight + i * 5;
    update();
}

void AnimationButton1::leaveImageChanged(QVariant index)
{
    int i = index.toInt();
    targetWidth = pixWidth - i * 5;
    targetHeight = pixWidth - i * 5;
    update();
}

QString AnimationButton1::getImageName() const
{
    return this->imageName;
}

QSize AnimationButton1::sizeHint() const
{
    return QSize(95, 95);
}

QSize AnimationButton1::minimumSizeHint() const
{
    return QSize(10, 10);
}

void AnimationButton1::setImageName(const QString &imageName)
{
    if (this->imageName != imageName) {
        this->imageName = imageName;
        QPixmap pix(imageName);
        pixWidth = pix.width();
        pixHeight = pix.height();
        oldWidth = pixWidth;
        oldHeight = pixHeight;
        targetWidth = pixWidth - 25;
        targetHeight = pixHeight - 25;
        update();
    }
}

#include "widgetKeyBoard.h"
#include <QApplication>
#include <QDesktopWidget>
#include <QLayout>
#include <QScreen>
#include <QKeyEvent>
#include <QDir>
#include <QDebug>


#define ZOOMED_WIDGET_STYLESHEET    "border-radius:8px;font:bold 16px;color:white;"

widgetKeyBoard::widgetKeyBoard(QWidget *parent) :
        QWidget(parent), m_parent(parent)
{
    m_created = false;
    keyboardGroup = new QGroupBox(this);
    keyboardGroup->setTitle("");
    createKeyboard();
}

QKeyPushButton * widgetKeyBoard::createNewKey(QString keyValue)
{
    QKeyPushButton *tmp = new QKeyPushButton(this);
    int width = 0, height = 0;

    tmp->setText(keyValue);
    width = KEY_WIDTH_EMBEDDED;
    height = KEY_HEIGHT_EMBEDDED;

    tmp->setObjectName(keyValue);
    tmp->setMinimumSize(width, height);
    tmp->setMaximumSize(width, height);

    tmp->setVisible(true);
    return (tmp);
}

void widgetKeyBoard::upperLowerSwitch()
{
    //line 1 is digital. no need to convert to upper case
    //iterate vertical layout item
    for (int i = 1; i < layout()->count(); ++i) {
        QLayoutItem *layoutItem = layout()->itemAt(i);
        QLayout *hlayout = layoutItem->layout();
        iterate horizon layout item

        for (int j = 0; j < hlayout->count(); ++j) {
            QLayoutItem *hlayoutItem = hlayout->itemAt(j);
            QKeyPushButton *key = (QKeyPushButton *)hlayoutItem->widget();
            if (IS_CAPS(key->text()) || IS_DEL(key->text()))
                continue;
            if (mIsUpper)
                key->setText(key->text().toLower());
            else
                key->setText(key->text().toUpper());
        }
    }
    mIsUpper = !mIsUpper;
}

void widgetKeyBoard::resizeEvent(QResizeEvent *event)
{
    keyboardGroup->resize(this->width(),this->height());
}
//create keyboard
void widgetKeyBoard::createKeyboard(void)
{
    QKeyPushButton	*tmp = NULL;
    QVBoxLayout     *tmpVLayout = new QVBoxLayout;
    QHBoxLayout     *tmpLayout = new QHBoxLayout;

    if (m_created == true)
        return;
    m_created = true;

    for (short i = '1'; i <= '9'; i++) {
        tmpLayout->addWidget(createNewKey(QChar(i)));
    }
    tmpLayout->addWidget(createNewKey(tr("0")));
    tmpVLayout->insertLayout(0, tmpLayout);

    tmpLayout = new QHBoxLayout;
    tmpLayout->addWidget(createNewKey(tr("Q")));
    tmpLayout->addWidget(createNewKey(tr("W")));
    tmpLayout->addWidget(createNewKey(tr("E")));
    tmpLayout->addWidget(createNewKey(tr("R")));
    tmpLayout->addWidget(createNewKey(tr("T")));
    tmpLayout->addWidget(createNewKey(tr("Y")));
    tmpLayout->addWidget(createNewKey(tr("U")));
    tmpLayout->addWidget(createNewKey(tr("I")));
    tmpLayout->addWidget(createNewKey(tr("O")));
    tmpLayout->addWidget(createNewKey(tr("P")));
    tmpVLayout->insertLayout(1, tmpLayout);

    tmpLayout = new QHBoxLayout;
    tmpLayout->addWidget(createNewKey(tr("A")));
    tmpLayout->addWidget(createNewKey(tr("S")));
    tmpLayout->addWidget(createNewKey(tr("D")));
    tmpLayout->addWidget(createNewKey(tr("F")));
    tmpLayout->addWidget(createNewKey(tr("G")));
    tmpLayout->addWidget(createNewKey(tr("H")));
    tmpLayout->addWidget(createNewKey(tr("J")));
    tmpLayout->addWidget(createNewKey(tr("K")));
    tmpLayout->addWidget(createNewKey(tr("L")));
    tmpVLayout->insertLayout(2, tmpLayout);

    tmpLayout = new QHBoxLayout;
    tmp = createNewKey(KEY_CAPS);
    tmp->setMaximumWidth(tmp->maximumWidth() * 2 + 5);
    tmp->setMinimumWidth(tmp->minimumWidth() * 2 + 5);
    tmpLayout->addWidget(tmp);
    tmpLayout->addWidget(createNewKey(tr("Z")));
    tmpLayout->addWidget(createNewKey(tr("X")));
    tmpLayout->addWidget(createNewKey(tr("C")));
    tmpLayout->addWidget(createNewKey(tr("V")));
    tmpLayout->addWidget(createNewKey(tr("B")));
    tmpLayout->addWidget(createNewKey(tr("N")));
    tmpLayout->addWidget(createNewKey(tr("M")));
    tmp = createNewKey(KEY_DEL);
    tmp->setMaximumWidth(tmp->maximumWidth() * 2);
    tmp->setMinimumWidth(tmp->minimumWidth() * 2);
    tmpLayout->addWidget(tmp);

    tmpVLayout->insertLayout(3, tmpLayout);

    this->setLayout(tmpVLayout);
    this->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
}