Multichannel Audio Output using QAudioOutput

[mccurrab]

So some quick background, I am trying to make a surround sound environment in which the user has a lot of control over which sounds are played where. These sounds are coming exclusively from .aiff files (don't ask why) which means that I pretty much just have the raw samples (16 bit Big Endian Samples). I am trying to use my sound card (which has multiple outputs) to do this, however I'm having some issues. I tried to simply make a 441Hz wave to play out of each speaker, but I don't think I'm doing it right because all I'm getting is garbage sound.

I know there are a few things I'm doing wrong, so could someone try to give me some advice?

(this is a small test program i am writing to test it so that i don't have to go through all my other code [basically a proof of concept])

@#include "mainwindow.h"

mainWindow::mainWindow(QWidget *parent) :
QMainWindow(parent)
{
this->resize(550,900);
QWidget * central = new QWidget();
this->setCentralWidget(central);
out = new QLabel(central);
out->resize(500,850);
out->move(25,25);
QString * outString = new QString();

QList<QAudioDeviceInfo> avail = QAudioDeviceInfo::availableDevices(QAudio::AudioOutput);
for(int i=0; i< avail.length();i++)
{
    QAudioDeviceInfo temp = avail.at(i);
    outString->append(temp.deviceName() + "\n");
    QList<int> count = temp.supportedChannelCounts();
    outString->append("channels:");
    for(int j=0; j<count.length();j++)
    {
        outString->append(QString::number(count.at(j))+" ");
    }
    outString->append("\n");

    QList<int> bits = temp.supportedSampleSizes();
    outString->append("bits:");
    for(int j=0; j<bits.length();j++)
    {
        outString->append(QString::number(bits.at(j))+" ");
    }
    outString->append("\n");

    QList<int> rates = temp.supportedSampleRates();
    outString->append("bitrates:");
    for(int j=0; j<rates.length();j++)
    {
        outString->append(QString::number(rates.at(j))+" ");
    }
    outString->append("\n");

    QList<QString> codecs = temp.supportedCodecs();
    outString->append("codecs:");
    for(int j=0; j<codecs.length();j++)
    {
        outString->append(codecs.at(j)+" ");
    }
    outString->append("\n");

    QList<QAudioFormat::SampleType> types = temp.supportedSampleTypes();
    outString->append("types:");
    for(int j=0; j<codecs.length();j++)
    {
        outString->append(QString::number(types.at(j))+" ");
    }
    outString->append("\n");
    outString->append("\n");
}
out->setText(*outString);

QAudioOutput * toPlaywith;
QAudioFormat format;

format.setFrequency(44100);
format.setChannelCount(4);
format.setSampleSize(16);
format.setCodec("audio/pcm");
format.setByteOrder(QAudioFormat::LittleEndian);
format.setSampleType(QAudioFormat::SignedInt);

QAudioDeviceInfo info(avail.at(0));
 if (!info.isFormatSupported(format)) {
     qDebug()<<"raw audio format not supported by backend, cannot play audio.";
     return;
 }

 toPlaywith = new QAudioOutput(format, this);

 QBuffer * tempDev = new QBuffer();
 tempDev->open(QIODevice::ReadWrite);
 tempDev->seek(0);
 toPlaywith->start(tempDev);
 char* trans = new char[88200];
 for(int i=0;i<44100;i++)
 {
     uint16_t datapoint = cos((i*2*3.141592)/44100) * 0x7F;
     trans[2*i] = datapoint;
     trans[2*i+1] = datapoint/16;
     //trans[2] = datapoint;
     //trans[3] = datapoint/16;
     //trans[4] = datapoint;
     //trans[5] = datapoint/16;
     //trans[6] = datapoint;
     //trans[7] = datapoint/16;
 }
 int i=0;
 qint64 ActPos = tempDev->pos();
 tempDev->seek(tempDev->size());
 tempDev->write(trans,2);
 tempDev->seek(ActPos);
 while(i<20)
 {

     qint64 ActPos = tempDev->pos();
     tempDev->seek(tempDev->size());
     tempDev->write(trans,88200);
     tempDev->seek(ActPos);
     i++;
 }

}
@