[QAudioOuput/QAudioInput] Noise sound when send audio to the network

Styleoshin

Hello,
I want to make an audio communication on the network between devices. For that, I'm using QAudioInput and QAudioOuput.
I used the example to write and read on a file and it works perfectly.
But the problem is on the network, I have a noise sound.

Client code:

// The format is configured to have a good result like the example
void AudioNetwork::sendData()
{
    m_audio->start(&m_socket);
}

Server code:

// The format is the same as the client
void Server::newConnection()
{
    QTcpSocket* socket = m_server.nextPendingConnection();
    connect(socket,&QTcpSocket::readyRead,this,&Server::readyRead);

    m_device = m_audio->start();
}

void Server::readyRead()
{
    QTcpSocket* socket = qobject_cast<QTcpSocket*>(sender());
    m_device->write(socket->readAll());
}

Second try
In the server, I also used QBuffer, but it needs to manage the position (seek) to read. The buffer needs to be open on QIODevice::ReadWrite

m_audio->start(&m_buffer);

Third try
I also try to write directly on a file with directly incoming data on the network, and I listen to the content with the example of QAudioOutput and get some noise. Because to obtain a good sound, we need to write directly on the file with QAudioInput, not with incoming data in the network.

void Server::readyRead()
{
    QTcpSocket* socket = qobject_cast<QTcpSocket*>(sender());
    QDataStream out (&m_destination_file);
    out << socket->readAll();
}

So I don't know how to get a good sound in real-time on the network.
I'm using QTcpSocket and QTcpServer.

Thank you.

SGaist

Hi,

What about using UDP ?
TCP ensures that everything arrives to the target but there's no guarantee about the timing.

Styleoshin

I tested With QUdpSocket

void Server::readyRead()
{
    while (m_server.hasPendingDatagrams())
    {
       QNetworkDatagram datagram = m_server.receiveDatagram();
       m_device->write(datagram.data());
    }
}

It works better than QTcpSocket because I get the sound in real-time when I speak with a microphone. But the problem, it's the horrible noise that hurts the ears.

Bonnie

Wouldn't raw audio data be too big for real-time network transfering?
I think people usually use audio encoding / decoding in such situation.

Styleoshin

I will try that with Opus Audio or QAudioDecoder.