void GraphicsWorker::run()
{
qDebug() << "Starting graphics worker...";
//Create scene with new keyword from heap so it does not disappear from the stack
QGraphicsScene *scene = new QGraphicsScene();
//If scene ref exists, delete old, else set a scene ref.
if(!this->sceneRef)
{
this->sceneRef = scene;
}
else
{
delete this->sceneRef;
this->sceneRef = scene;
}
QPainterPath *path = new QPainterPath(QPointF(0, 0));
QPainter *painter = new QPainter();
QPen pen = QPen(Qt::DashLine);
//Draw axis
scene->addLine(-100, 0, 100, 0, pen);
scene->addLine(0, -100, 0, 100, pen);
//
//Access wavFile data
if(wavFile.hexFormatChunkIdText != "fmt ")
{
//qDebug() << "error";
//qDebug() << wavFile.hexFormatChunkIdText;
exit(-1);
}
if (wavFile.formatAudioFormat != 1)
{
//qDebug() << "error, unsupported audio format.";
exit(-1);
}
//continue
//qDebug() << "good";
int i;
for(i=0;i<wavFile.hexDataChunk.size();i+= wavFile.formatBlockAlign*2)
{
// read signal
if(wavFile.formatNumChannels == 1 && wavFile.formatBitsPerSample == 8)
{
bool ok;
QByteArray sample = wavFile.hexDataChunk.mid(i, 2);
int sampleValue = sample.toInt(&ok, 16);
path->lineTo(i, sampleValue);
}
else if(wavFile.formatNumChannels == 1 && wavFile.formatBitsPerSample == 16)
{
QByteArray sample = wavFile.hexDataChunk.mid(i, 4);
bool ok;
int sampleValue = sample.toInt(&ok, 16);
//2's complement
if(sampleValue > 32767)
{
sampleValue = (sampleValue - 65535);
}
path->lineTo(i, sampleValue);
}
else if(wavFile.formatNumChannels == 2 && wavFile.formatBitsPerSample == 8)
{
QByteArray leftSample = wavFile.hexDataChunk.mid(i, 2);
QByteArray rightSample = wavFile.hexDataChunk.mid(i+2, 2);
}
else if(wavFile.formatNumChannels == 2 && wavFile.formatBitsPerSample == 16)
{
QByteArray leftSample = wavFile.hexDataChunk.mid(i, 4);
QByteArray rightSample = wavFile.hexDataChunk.mid(i+4, 4);
}
}
painter->fillPath(*path, Qt::blue);
scene->addPath(*path);
//Change scene owner to mainThread
scene->moveToThread(QApplication::instance()->thread());
emit sceneReady(scene);
delete path;
delete painter;
}
