title: In InputStream, what does blocksize do? (sounddevice)
body: <p>I am building a guitar tuner GUI with sounddevice. This is my code for the recording part:</p>
  <pre class="lang-py prettyprint-override"><code> def stream(self):
          if self.stream is not None:
              self.stream.close()
          self.stream = sd.InputStream(
            channels=1, callback=self.callback, blocksize=...) 
          self.stream.start()
  </code></pre>
  <p>This is callback:</p>
  <pre class="lang-py prettyprint-override"><code># tunertools is another file with functions that compute on arrays
  def callback(indata, frames, time, status):
          print(indata)
          data = indata.copy()
          yin , *others = tunertools.YIN(data, frames)
          pitch = tunertools.avg_pitch(yin)
          noteslist = {k:v for k,v in tunertools.notes()}
          note = tunertootls.quantize(pitch, noteslist.values)
          print( {v:k for (k,v) in noteslist.values()}[note] )
  </code></pre>
  <p>For now, I am printing the output in terminal. I want a new output to be printed every 4 seconds of recording. This means that every 4 seconds, the callback function should be initiated. How do I do this? More importantly, do I need to use the blocksize parameter to do this?</p>