First try

device.cpp

@@ -0,0 +1,47 @@
+#include "device.h"
+
+#include <cmath>
+
+#include <QTimerEvent>
+
+Device::Device(QObject *parent) :
+    QIODevice(parent)
+{
+    setOpenMode(QIODevice::WriteOnly);
+}
+
+qint64 Device::readData(char *data, qint64 maxlen)
+{
+    qFatal("oida");
+}
+
+qint64 Device::writeData(const char *data, qint64 len)
+{
+    Q_ASSERT(len % sizeof(SamplePair) == 0);
+    emit samplesReceived(reinterpret_cast<const SamplePair*>(data),
+                         reinterpret_cast<const SamplePair*>(data + (len/sizeof(SamplePair))));
+    return len;
+}
+
+FakeDevice::FakeDevice(QObject *parent) :
+    QObject(parent), m_timerId(startTimer(1000/60))
+{
+}
+
+void FakeDevice::timerEvent(QTimerEvent *event)
+{
+    if (event->timerId() == m_timerId)
+    {
+        std::array<SamplePair, 44100/60> samples;
+        for (SamplePair &pair : samples)
+        {
+            pair.x = std::sin(m_dingsDesHaltHochZaehlt) * std::numeric_limits<qint16>::max();
+            pair.y = std::cos(m_dingsDesHaltHochZaehlt) * std::numeric_limits<qint16>::max();
+            m_dingsDesHaltHochZaehlt += 0.05;
+        }
+
+        emit samplesReceived(samples.begin(), samples.end());
+    }
+    else
+        QObject::timerEvent(event);
+}