title: QT 5.7 Analyze audio output
body: <p>Firstly, sorry my english.</p>
  
  <p>Secondly, I have a question:
  I'm running QT 5.7 under win7x64. My idea is to create a program that can visualize (eg. Spectrum) audio. But all examples, that i've seen, explaining how to analyze, sound gets from microphone or file that playing in this example.</p>
  
  <p>My purpose is to catch sound that people hear from speakers (or headphones) - all sounds including system beeps, any audio from any players (vlc, winamp, even windows media) - and make audio spectrum.</p>
  
  <p>I've read about QtMultimedia, but as I understand it can get spectrum only from microphone or file.</p>
  
  <p>By now, I have found <a href="http://www.un4seen.com/doc/#bass/bass.html" rel="nofollow noreferrer">bass.dll</a>, but as I see - it can record from system output device, and then get spectrum (no realtime) - am I right?</p>
  
  <p>Could you explain, how to get audio, that plays from speakers in realtime? Any exapmples will be very good. Or link, at least, where I can read about. (5 hours googling was not really helpful)</p>
  
  <p>Thanks a lot.</p>