Get QAudioBuffer from QMediaPLayer

[azazaz]

Hi, I create stream player based on qmediaplayer and want add peak level meter to it.
i use functions from example recorder and make this:
http://gyazo.com/a45cb3f5dd5a072094d41463ad0b56c3.gif (the image is too large to insert it here, 183kb)


my result left on image, on right what i need

peak level update based on signal from QAudioProbe

QAudioProbe *probe = new  QAudioProbe(); 
 connect(probe, SIGNAL(audioBufferProbed(QAudioBuffer)),
                 this, SLOT(processBuffer(QAudioBuffer)));

QAudioProbe *probe = new  QAudioProbe(); 
 connect(probe, SIGNAL(audioBufferProbed(QAudioBuffer)),
                 this, SLOT(processBuffer(QAudioBuffer)));

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i tried emit this signal but it not working;

how to emit this signal or get audiobuffer from player for no use signal and send buffer to processBuffer manualy?