read from socket tcp and start play raw audio

[zabitqt]

Hi,

when my client start I am not able to play row audio data received from socket server sent to client.
Audio data received are captured from microphone and data from server is sent to client.

I have sure data on client comes from server are correct .
is there a mistake in format configuration of QAudioOutput?

mytcpsocket.h

#ifndef MYTCPSOCKET_H
#define MYTCPSOCKET_H

#include <QObject>
#include <QTcpSocket>
#include <QAbstractSocket>

class MyTcpSocket : public QObject
{
    Q_OBJECT
public:
    explicit MyTcpSocket(QObject *parent = nullptr);
    void doConnect();

signals:
public slots:
    void connected();
    void disconnected();
    void bytesWritten(qint64 bytes);
    void readyRead();

private:
     QTcpSocket *socket;
};

#endif // MYTCPSOCKET_H

mytcpsocket.cpp

#include "mytcpsocket.h"
#include <QBuffer>
#include <QMediaPlayer>
#include <QMediaContent>
#include <QAudioOutput>
#include <QThread>


MyTcpSocket::MyTcpSocket(QObject *parent) : QObject(parent)
{

}

void MyTcpSocket::doConnect()
{
    this->socket = new QTcpSocket(this);

    connect(this->socket, SIGNAL(connected()),this, SLOT(connected()));
    connect(this->socket, SIGNAL(disconnected()),this, SLOT(disconnected()));
    connect(this->socket, SIGNAL(bytesWritten(qint64)),this, SLOT(bytesWritten(qint64)));
    connect(this->socket, SIGNAL(readyRead()),this, SLOT(readyRead()));

    qDebug() << "connecting...";

    socket->connectToHost("192.168.56.1", 12345);

    // we need to wait...
    if(!socket->waitForConnected(5000))
    {
        qDebug() << "Error: " << socket->errorString();
    }
}

void MyTcpSocket::connected()
{
    qDebug() << "connected...";
}

void MyTcpSocket::disconnected()
{
    qDebug() << "disconnected...";
}

void MyTcpSocket::bytesWritten(qint64 bytes)
{
    qDebug() << bytes << " bytes written...";
}

void MyTcpSocket::readyRead()
{
    qDebug() << "reading...";

    // read the data from the socket
    //qDebug() << socket->readAll();

    //CREATE A BUFFER OBJECT WITH BYTE ARRAY
    QByteArray data;
    data = socket->readAll();


    QAudioFormat format;
    format.setSampleRate(48000);
    format.setChannelCount(2);
    format.setSampleSize(16);
    format.setCodec("audio/pcm");
    format.setByteOrder(QAudioFormat::LittleEndian);
    format.setSampleType(QAudioFormat::SignedInt);
    QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
    if (!info.isFormatSupported(format)) {
        qWarning()<<"raw audio format not supported by backend, cannot play audio.";
        return;
    }

    QAudioOutput *qAudioOutput = new QAudioOutput(format, NULL);
    qAudioOutput->setBufferSize(16 * 48000);
    QIODevice *qAudioDevice = qAudioOutput->start();
    qAudioDevice->write(data,data.length());
}

main.cpp

#include <QCoreApplication>
#include "mytcpsocket.h"
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    MyTcpSocket s;
    s.doConnect();
    return a.exec();
}

[SGaist]

Hi,

1. Why are you creating a new QAudioOutput object each time readyRead is called ?
2. You do not take into account that data may not contain a full audio frame
3. You do not take into account that you may have different audio formats between the server and the client

[zabitqt]

Ho, i edit my code, now qAudioOutput and qAudioDevice are in class scope as private attribuite.
// In constructor
qAudioOutput = new QAudioOutput(format, NULL);
qAudioOutput->setBufferSize(16 * 48000);
qAudioDevice = qAudioOutput->start();

// In method
data = socket->readAll();
qAudioDevice->write(data,data.length());

[zabitqt]

Now my problem is that I hear rustle, a continue "shshshshsh" of micphone behind the speak. How can I solve it?

[SGaist]

Beside the noise, are you getting the rest correctly ?

[zabitqt]

Yes, the rest is ok. Over raw audio I hear a rustle "shshshsh" from my stereo speaker. How can I void this noise?

[SGaist]

You need to apply some noise cancellation on your input.

[bandkarde3]

This post is deleted!

[SGaist]

@SGaist said in read from socket tcp and start play raw audio:

You need to apply some noise cancellation on your input.