如何在 Qt 中通过以太网播放流媒体音频？

我的目标是通过 LAN 网络无延迟或最少延迟地传输 *.wav 文件。

我们还按部分读取服务器计算机上的文件，均为 320 字节。之后我们通过 UDP 发送数据包并将接收写入 jitter-buffer 中。抖动缓冲区的大小为 10。 为了获得清晰的声音，我应该在定时器上设置什么延迟？

这是发件人：

void MainWindow::on_start_tx_triggered()
{
    timer1 = new QTimer (this);
    udpSocketout = new QUdpSocket(this);
    qDebug()<<"Start";
    for (int i = 0; i < playlist.size(); ++i)
    {
        inputFile.setFileName(playlist.at(i));
        qDebug()<<inputFile.fileName();
        if (!inputFile.open(QIODevice::ReadOnly))
        {
            qDebug()<< "file not found;";
        }
    }
    connect(timer1, SIGNAL(timeout()), this, SLOT(writeDatagrams()));
    timer1->start(5);
}

void MainWindow::writeDatagrams()
{
    if(!inputFile.atEnd()){
        payloadout = inputFile.read(320);
    }
    qDebug()<<payloadout;
    QDataStream out(&datagramout, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_7);
    out << qint64(0);
    out << payloadout;
    out.device()->seek(qint64(0));
    out << qint64(datagramout.size() - sizeof(qint64));
    qint64 writtenBytes = udpSocketout->writeDatagram(datagramout, remoteHOST, remotePORT);
    qDebug() << "Sent " << writtenBytes << " bytes.";
}

这是接收者和播放器：

void MainWindow::on_start_rx_triggered()
{
    udpSocketin = new QUdpSocket(this);
    udpSocketin->bind(localHOST, localPORT);
    connect(udpSocketin, SIGNAL(readyRead()),
            this, SLOT(readDatagrams()));
    QDataStream out(&datagramout, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_7);
    timer2 =  new QTimer (this);
    connect(timer2, SIGNAL(timeout()), this, SLOT(playbuff()));
    timer2->start(50);
    audioout = new QAudioOutput(format, this);
}

void MainWindow::readDatagrams()
{
    datagramin.resize(udpSocketin->pendingDatagramSize());
    qint64 receiveBytes = udpSocketin->readDatagram(datagramin.data(), datagramin.size());
    qDebug() << "Receive " << receiveBytes << " bytes.";
    QDataStream in(&datagramin, QIODevice::ReadOnly);
    in.setVersion(QDataStream::Qt_4_7);
    quint64 size = 0;
    if(in.device()->size() > sizeof(quint64))
    {
        in >> size;
    }
    else
        return;
    if(in.device()->size() < size)
        return;
    in >> payloadin;
    qDebug() << payloadin.size();
    emit jitterbuff();
}

void MainWindow::jitterbuff()
{
    if (buff_pos < SIZE_OF_BUF)
    {
        QDataStream out(&buffered, QIODevice::WriteOnly);
        out.setVersion(QDataStream::Qt_4_7);
        out << payloadin;
        buff_pos++;
    }
    else
        buff_pos = 0;
}

void MainWindow::playbuff()
{
    qDebug() << "YES!!!";
    buffer = new QBuffer(&buffered);
    buffer->open(QIODevice::ReadOnly);
    audioout->start(buffer);
    QEventLoop loop;
    QTimer::singleShot(50, &loop, SLOT(quit()));
    loop.exec();
    buffer->close();
}

这个问题就解决了。 QAudioOutput 有两种模式；有“推”和“拉”。我给出一个指向 QIODevice 的指针，并将数据直接写入其中。解决方案：

读取UDP套接字：

void MainWindow::on_start_rx_triggered()
{
    udpSocketin = new QUdpSocket(this);
    udpSocketin->bind(localPORT);
    connect(udpSocketin, SIGNAL(readyRead()), this, SLOT(readDatagrams()));
    QDataStream out(&datagramout, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_7);
    timer2 = new QTimer (this);
    connect(timer2, SIGNAL(timeout()), this, SLOT(playbuff()));
    timer2->setInterval(15*9);
    audioout = new QAudioOutput(format, this);
    input = audioout->start();
}

void MainWindow::readDatagrams()
{
    if (udpSocketin->hasPendingDatagrams()){
    datagramin.resize(udpSocketin->pendingDatagramSize());
    qint64 receiveBytes = udpSocketin->readDatagram(datagramin.data(), datagramin.size());
    if (receiveBytes <= 0)
    {
        msg.warning(this, "File ERROR", "The end!", QMessageBox::Ok);
        emit on_stop_rx_triggered();
    }
    QDataStream in(&datagramin, QIODevice::ReadOnly);
    in.setVersion(QDataStream::Qt_4_7);
    quint64 size = 0;
    if(in.device()->size() > sizeof(quint64))
    {
        in >> size;
    }
    else return;
    in >> rxfilename;
    in >> name;
    in >> payloadin;
    emit jitterbuff();
}

void MainWindow::jitterbuff()
{
    if (buff_pos < SIZE_OF_BUF)
    {
        buffered.append(payloadin);
        buff_pos++;
    }
    else
    {
        timer2->start();
        buffered.clear();
        buff_pos = 0;
    }
}

void MainWindow::playbuff()
{
    if (!buffered.isEmpty())
    {
        buffer = new QBuffer(&buffered);
        buffer->open(QIODevice::ReadOnly);
        input->write(buffered);
        buffer->close();
    }
}

写入 UDP 套接字：

void MainWindow::on_start_tx_triggered()
{
    timer1 = new QTimer (this);
    udpSocketout = new QUdpSocket(this);
    inputFile.setFileName(playlist.at(playIDfile));
    if (!inputFile.open(QIODevice::ReadOnly))
    {
        msg.warning(this, "File ERROR", "File not found!", QMessageBox::Ok);
        return;
    }
    fileinfo = new QFileInfo (inputFile);
    txfilename = fileinfo->fileName();
    ui->playedFile->setText("Now played: " + txfilename);
    connect(timer1, SIGNAL(timeout()), this, SLOT(writeDatagrams()));
    timer1->start(15);
}
void  MainWindow::writeDatagrams()
{

    if(!inputFile.atEnd()){
        payloadout = inputFile.read(SIZE_OF_SOUND);
        QDataStream out(&datagramout, QIODevice::WriteOnly);
        out.setVersion(QDataStream::Qt_4_7);
        out << qint64(0);
        out << txfilename;
        out << name;
        out << payloadout;
        out.device()->seek(qint64(0));
        out << qint64(datagramout.size() - sizeof(qint64));
        qint64 writtenBytes = udpSocketout->writeDatagram(datagramout, remoteHOST, remotePORT);
    }
}

如果有人遇到问题，我会尽力帮助他/她。