Recovering from underruns in QAudioOutput, using custom QIODevice

[JKSH]

Hi all,

If I use a QIODevice provided by QAudioOutput, it automatically recovers from buffer underruns once I write in more data:
@
QIODevice *autoDevice = audioOutput->start();

// ... Underrun occurs

autoDevice->write(moreData, length);
// ... QAudioOutput continues playing
@

However, if I provide a custom device, it doesn't automatically recover:
@
audioOutput->start(myCustomDevice);

// ... Underrun occurs

myCustomDevice->write(moreData, length);
// ... Nothing happens
@

I presumed that in the first case, QAudioOutput internally connects the signals to enable auto-recovery when new data arrives. So, I made sure I emitted the readyRead() and bytesWritten() signals from inside MyCustomDevice::writeData(). That didn't work though.

Am I missing something? Does QAudioOutput connect signals when I call audioOutput->start(myCustomDevice), or do I have to do it manually?