Reemit readyRead() signal from audio device

I need to process audio data in realtime (without writing to drive as in examples). For this purpose I use QAudioInput from QtMultimedia (Qt 4.7.3, Mac OS X 10.5.8) which works in a "push" mode:

Code:

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QAudioInput* m_pStream = new QAudioInput(Format, this);
QIODevice* m_pBuffer = m_pStream->start();
connect(m_pBuffer, SIGNAL(readyRead()), this, SLOT(SendData()));

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Slot SendData reads buffer and sends data to the processing algorithm:

Code:

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void CQtAudioStream::SendData()
{
    Q_ASSERT(m_pBuffer);
 
    emit SendAudioBuffer(m_pBuffer->readAll().data());
}

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The problem is readyRead() signal emits only once from m_pBuffer device. What should I do to reemit it?