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default format not supported try to use nearest 
"point 1" 
"" 
StartPlay 
default format not supported try to use nearest 

QDataStream out(&file);
    out << (QString)"point 1";
    out << (QByteArray)buffer->buffer();
    out << (QString)"point 2";

    QString a;
    
    in >> a;
    qDebug() << a;
    
    in >> ar;
    
    in >> a;
    qDebug() << a;

#ifndef RECORDER_H
#define RECORDER_H

#include <QObject>
#include "QDebug"
#include "QtMultimedia/QAudioFormat"
#include "QtMultimedia/QAudioDeviceInfo"
#include "QtMultimedia/QAudioInput"
#include "QtMultimedia/QAudioOutput"
#include "QBuffer"

#include "QFile"




class Recorder : public QObject
{
    Q_OBJECT
public:
    explicit Recorder(QObject *parent = 0);

signals:

public slots:
void StartRecord();
void StopRecord();
void StartPlay();

private:
QAudioInput * audio_input;
QAudioOutput * audio_out;
QBuffer * buffer;

QBuffer * tmp;

private slots:
};

#endif // RECORDER_H

#include "recorder.h"

Recorder::Recorder(QObject *parent) :
    QObject(parent)
{
}

void Recorder::StartRecord(){
    buffer = new QBuffer;
    buffer->open(QIODevice::ReadWrite);




    QAudioFormat format;
    format.setFrequency(8000);
    format.setChannels(1);
    format.setCodec("audio/pcm");
    format.setByteOrder(QAudioFormat::LittleEndian);
    format.setSampleType(QAudioFormat::UnSignedInt);

    QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice();
    if (!info.isFormatSupported(format))
    {
      qWarning() << "default format not supported try to use nearest";
      format = info.nearestFormat(format);
    }

    audio_input = new QAudioInput(format,this);
    audio_input->start(buffer);
}



void Recorder::StopRecord(){
    audio_input->stop();

    QFile file("file.dat");
    file.open(QIODevice::WriteOnly);
    QDataStream out(&file);
    out << (QString)"point 1";
    out << (QByteArray)buffer->buffer();
    out << (QString)"point 2";

    StartPlay();

}

void Recorder::StartPlay(){
    tmp = new QBuffer();
    tmp->open(QIODevice::ReadWrite);

    QFile file("file.dat");
    file.open(QIODevice::ReadOnly);
    QDataStream in(&file);
    QByteArray ar;
    QString a;
    
    in >> a;
    qDebug() << a;
    
    in >> ar;
    
    in >> a;
    qDebug() << a;
    
    tmp->write(ar);
    tmp->seek(0);
    
    qDebug() << "StartPlay";

    QAudioFormat format;
    format.setFrequency(8000);
    format.setChannels(1);
    format.setCodec("audio/pcm");
    format.setByteOrder(QAudioFormat::LittleEndian);
    format.setSampleType(QAudioFormat::UnSignedInt);
    QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice();
    if (!info.isFormatSupported(format))
    {
      qWarning() << "default format not supported try to use nearest";
      format = info.nearestFormat(format);
    }
    audio_out = new QAudioOutput(format,this);
    audio_out->start(tmp);
}