How can read data from .wav file with true rate?

[isan]

I want to read the .wav file at the written speed, I used part of the QT Spectrum project
(wavfile class) in my project and I did not understand how the QT spectrum project handles reading speed, I do this but it's not work correctly, I think the timer not set correctly, Is there a better way to do this?

QByteArray ReadFile::ReadData()
{
    QTimer* timer = new QTimer(this);
    connect(timer, &QTimer::timeout, this, &ReadFile::fetchData);


    QString dataFilePath = QDir::homePath().append("/sample.wav");
    mDataFile = new QFile(dataFilePath);
    mDataFile->open(QFile::OpenModeFlag::ReadOnly);
    QByteArray bytes = mDataFile->readAll();
    double DemodSize = 32768;

        waveFile->open(dataFilePath);
        SampleRate = waveFile->m_fileFormat.sampleRate();
        sample_size = waveFile->m_fileFormat.sampleSize();
        NumChannel = waveFile->m_fileFormat.channelCount();

        if(NumChannel == 1)
            DemodSize = DemodSize/4;
        else if(NumChannel == 2)
            DemodSize = DemodSize/2;
       int  seek = 44;
        mDataFile->seek(seek);
        
        
        dataRead = sample_size * NumChannel / 8;  //size of each data

    if(SampleRate>0 && DemodSize>0)
        timer->start(DemodSize/SampleRate);   //timer for each reading

    return byte;
}


void ReadFile::fetchData()
{

    for (int i = 0; i <FFTvalue; i++) {    //loop use FFT size
        QByteArray iq= mDataFile->read(dataRead);
        mDataFile->seek(mDataFile->pos()+dataRead);  //for read next data
       
     //add to buffer

      }

}

[SGaist]

Hi,

Did you check the values you actually get ?
Do they make sense ?

[isan]

@SGaist Yes, I print it, no problem
I'm not sure if my method is correct

[SGaist]

Can you described exactly what is happening that is wrong ?